CN110604408B

CN110604408B - Function frame and seat

Info

Publication number: CN110604408B
Application number: CN201810621237.XA
Authority: CN
Inventors: 赵涌; 阮正富
Original assignee: UE Furniture Co Ltd
Current assignee: UE Furniture Co Ltd
Priority date: 2018-06-15
Filing date: 2018-06-15
Publication date: 2024-06-07
Anticipated expiration: 2038-06-15
Also published as: CN110604408A

Abstract

The invention relates to a functional frame and a seat, wherein a backrest component at the rear part is removed, and the vertical distance between the highest point and the lowest point of the functional frame is 170-220 mm; the leg rest assembly consists of a plurality of groups of four-bar mechanisms; the cushion support assembly comprises an upper cushion support piece, a lower cushion support piece, a front cushion support piece and a rear cushion support piece which form a four-bar mechanism; backrest auxiliary components are arranged on the left side and the right side of the fixed frame; a seat comprises the functional rack, a leg rest assembly is provided with a leg rest, and the leg rest is arranged on the leg rest; the cushion support component is provided with a cushion, and the upper end of the backrest component is provided with a backrest; handrails are inserted on the side plates. Compared with the prior art, the invention solves the defect that the height of the functional rack is shortened and the leg rest plate lands; meanwhile, the backrest auxiliary assembly is arranged so that the functional frame can run smoothly and can return obliquely.

Description

Function frame and seat

Technical Field

The invention relates to the technical field of furniture, in particular to a functional frame and a seat.

Background

At present, the height of a functional rack arranged in a functional seat is generally higher, the height is basically more than 220mm, and correspondingly, the height of the seat is also higher; the huge functional rack cannot be applied to some low seats, even if the huge functional rack is only lowered in height, the running process of the shortened functional rack is often accompanied by the phenomena of clamping, unsmooth tilting, laborious returning, insufficient footrest length and the like, and the phenomenon is more prominent for the non-electric functional rack, so that the short seats can only be used as non-functional seats when the height of the functional rack is lowered and cannot be well matched with the short seats; however, there is an increasing demand in the market, and there is an urgent need for a low-profile functional rack that can be operated smoothly, that can save effort in tilting and returning, and that can provide advantages such as a change in the height of the backrest, and a low-profile seat using the same.

In order to overcome the defects in the prior art, the invention provides the functional frame and the chair which are low, smooth in operation and labor-saving in tilting recovery.

Disclosure of Invention

The invention overcomes the defects in the prior art and provides the functional frame and the chair which are low, smooth in operation and labor-saving in tilting recovery.

The invention is realized in the following way:

The functional rack comprises a fixed rack, wherein the left side and the right side of the fixed rack are provided with leg rest plate assemblies, cushion support assemblies and backrest assemblies which are arranged in pairs, the front end and the rear end of each cushion support assembly are respectively hinged with one end of each leg rest plate assembly and one end of each backrest assembly, the backrest assemblies at the rear part are removed, and the vertical distance between the reference surface of each cushion support assembly and the lowest point of the functional rack is 170-220 mm; the leg rest assembly consists of a plurality of groups of four-bar mechanisms, and the highest point of the leg rest assembly is lower than the highest point of the cushion support assembly or is approximately on the same horizontal plane with the highest point of the cushion support assembly in the folded state; the cushion support assembly comprises an upper cushion support piece, a lower cushion support piece, a front cushion support piece and a rear cushion support piece which form a four-bar mechanism; the left and right sides of the fixing frame are provided with backrest auxiliary components which are arranged in pairs left and right and are convenient for leaning and leaning back and recovering.

The functional rack in the market at present, except for the back rest component at the rear part, the vertical distance between the highest point and the lowest point of the functional rack is basically more than 220mm, and the functional rack is not suitable for the low seat, therefore, the height of the functional rack is adjusted so as to be suitable for the low seat; in particular to a functional frame which is shorter in height, smooth in operation, comprehensive in extension, labor-saving in tilting recovery and comfortable; firstly, as the height of the functional rack is reduced, the height of the original leg rest assembly after being folded is higher than the height of the functional rack, the phenomena of touching the ground and the like exist, and the expansion and the folding of the leg rest assembly cannot be well realized, so that the size of a connecting piece in the original leg rest assembly is required to be reduced, but the length of the reduced leg rest assembly after being expanded is also influenced, and the comfort is influenced; meanwhile, as the height of the functional frame is shortened, unsmooth and laborious backrest recovery and the like are often caused, the left side and the right side of the fixing frame are also provided with backrest auxiliary components, so that the functional frame can run smoothly and can tilt and recover with less effort, and the functional frame is suitable for a non-electric functional frame; specifically, the vertical distance between the reference surface of the cushion support assembly and the lowest point of the functional frame may be 170 to 190mm.

Preferably, the backrest auxiliary assembly is arranged between the lower cushion support and the inner side of the same-side fixed frame; the back support accessory assembly includes only the first back support accessory assembly, or only the second back support accessory assembly, or both the first and second back support accessory assemblies coupled to the rear and front portions of the lower cushion support, respectively.

In order to enable the backrest component to better realize the effects of smooth operation and labor saving of tilting and restoring, the first backrest auxiliary component or the second backrest auxiliary component can be independently arranged, and the first backrest auxiliary component and the second backrest auxiliary component which are convenient for tilting and restoring of the backrest can be respectively arranged at the front part and the rear part of the fixing frame.

Preferably, the first backrest auxiliary assembly comprises a sliding rail fixedly arranged at the rear part of the inner side of the fixed frame and a pulley rotatably connected at the rear part of the lower cushion support member, and the pulley is arranged in the sliding rail and can slide along the sliding rail.

The height of the seat surface is reduced in the process of tilting and falling of the backrest component, so that the gravity restoring force of the seat surface is insufficient; the pulley is made of plastic or micro-strip elastic materials, the sliding rail is made of metal materials, abnormal sounds are reduced, and the sliding rail is matched well.

Preferably, the track of the front part of the sliding rail is an arc, the track of the rest part of the sliding rail is a straight line or an arc tending to be straight, and the whole sliding rail is in an inclined shape with a front high bottom and a rear low bottom.

The invention designs the composite guide rail with the rear linear part or the arc part tending to be linear and the front arc part, and the height change of the pulley of the linear part or the arc part tending to be linear is more gentle in the initial stage when the backrest assembly is tilted down, so that the resistance of the backrest assembly to be tilted down is reduced, the tilting of the backrest assembly is facilitated, the lifting height of the pulley is quickened by the arc part, the gravity restoring force is increased, and the backrest assembly is ensured to be smoothly reset, thereby realizing the smoothness and labor saving of the tilting and restoring of the backrest assembly. For smaller size, after the height of the functional rack is reduced and the length of the functional rack is lengthened, the sizes of various connecting rods are limited, the height of the backrest component is reduced in the tilting and falling process, and the gravity restoring force of the seat surface is insufficient more easily, so that the composite guide rail with a rear linear part or an arc part tending to be linear and a front arc part is designed, the tilting and restoring of the backrest component is smooth and labor-saving, and the tilting and restoring of the backrest component is also smoothly and labor-saving through the smoothness of the pulley sliding rail for a non-electric functional rack.

Preferably, the included angle between the straight line part of the sliding rail or the arc line which tends to be straight line and the horizontal plane is 11-18 degrees.

The design of the angle directly relates to the inclination degree of the straight line part or the arc line part tending to be straight line, and for a functional frame with smaller size, the resistance of the backrest assembly to the tilting and falling down can be reduced, so that the tilting of the backrest assembly can be facilitated, and the tilting and restoring of the backrest assembly can bring smooth and labor-saving effects.

Preferably, the arc radius of the arc part at the front part of the sliding rail is 40 mm-150 mm.

The design that the radius of the circular arc is 40 mm-150 mm directly relates to the degree of accelerating the lifting height of the pulley, and for a functional frame with a smaller size, the gravity restoring force can be increased as well, the weight loss possibly caused by tilting can be overcome, the backrest component is ensured to be reset smoothly, and therefore the backrest component is tilted and restored smoothly and labor-saving.

Preferably, the ratio of the arc length of the arc line part of the front part of the sliding rail to the length of the straight line part of the rest part or the arc line part tending to be straight line is 1/6-1/2.

The setting of the proportion can realize smooth tilting and restoring and saves labor for the device.

Preferably, limiting devices used for preventing the sliding wheels from sliding out of the sliding rail are arranged at two ends of the sliding rail.

The limiting device is used for preventing the pulley from sliding out of the sliding rail.

Preferably, the second backrest auxiliary assembly comprises an auxiliary connecting piece A, an auxiliary connecting piece B and an auxiliary connecting piece C, wherein the auxiliary connecting piece B is of a crank structure with a bending position A and a forward opening; one end of the auxiliary connecting piece A and one end of the auxiliary connecting piece C are hinged with the inner side of the same-side fixing frame, the other end of the auxiliary connecting piece A and the other end of the auxiliary connecting piece C are respectively hinged with the upper end of the auxiliary connecting piece B and the bending part A of the auxiliary connecting piece B, and the other end of the auxiliary connecting piece B is hinged with the front part of the lower cushion supporting piece; the hinge point of the auxiliary connecting piece A and the hinge point of the fixing frame are located behind the hinge point of the auxiliary connecting piece C and the hinge point of the fixing frame, and the hinge point of the auxiliary connecting piece A and the hinge point of the auxiliary connecting piece B are located above the hinge point of the auxiliary connecting piece C and the hinge point of the fixing frame.

After the backrest component is tilted down, the gravity center of the human body is changed, and most of gravity is distributed at the front ends of the backrest and the sitting surface, so that the defect of restoring force is caused.

Preferably, when the backrest assembly is completely tilted down, the connection line of the hinge point between the auxiliary connecting piece A and the auxiliary connecting piece B and the hinge point between the auxiliary connecting piece C and the auxiliary connecting piece B is a connection line A, the connection line of the hinge point between the auxiliary connecting piece C and the auxiliary connecting piece B and the hinge point between the auxiliary connecting piece C and the fixed frame is a connection line B, and the included angle between the connection line A and the connection line B is smaller than 5 degrees; the connection line of the hinge point between the auxiliary connecting piece A and the auxiliary connecting piece B and the hinge point between the auxiliary connecting piece C and the fixing frame is a connection line C, and the included angle between the connection line C and the vertical line is smaller than 10 degrees.

After the backrest component is tilted down, the gravity center of the human body is changed, and most of gravity is distributed at the front ends of the backrest and the sitting surface, so that the restoring force is insufficient; adopting data with included angles smaller than 5 degrees and smaller than 10 degrees, so that the generated restoring force is larger; meanwhile, the mechanism is driven to move forwards, so that the zero wall leaning of the seat is realized; the included angles are acute included angles.

Preferably, the backrest assembly comprises a backrest connecting piece A, a backrest connecting piece B, a backrest connecting piece C, a backrest connecting piece D and a backrest connecting piece E, wherein the backrest connecting piece C is of a crank structure with a bending part B and a forward opening, and the backrest connecting piece D is an extending part of the rear part of the upper cushion supporting piece, which is inclined upwards; the two ends of the backrest connecting piece A are respectively hinged with one end of the backrest connecting piece B and the front part of the backrest connecting piece D; one end of the backrest connecting piece C is hinged with the middle part of the backrest connecting piece B, the other end of the backrest connecting piece C is hinged with one end of the backrest connecting piece E, the bent part B is hinged with the tail end of the backrest connecting piece D, the other end of the backrest connecting piece E is hinged with the same-side fixing frame, and the backrest connecting piece A, the backrest connecting piece B, the backrest connecting piece C and the backrest connecting piece D form a four-bar mechanism.

The backrest connecting piece E plays a role in supporting the four-bar mechanism, supports the four-bar mechanism which is inclined and fallen down when the leg rest plate component stretches, plays a role in buffering, and pulls the four-bar mechanism to prevent the four-bar mechanism from falling down.

Preferably, the backrest connecting piece A is provided with a limiting shaft A, and the end of the backrest connecting piece B hinged with the backrest connecting piece A extends to form a limiting rod; when the backrest component is in an initial state or only the leg rest board component stretches, the limiting rod is propped against the limiting shaft A; when the backrest component is completely tilted down, the backrest connecting piece B is propped against the limiting shaft A.

When the backrest component is in an initial state or only the leg rest plate is stretched, the limiting shaft A limits the movement track of the limiting rod and the backrest connecting piece A, so that the stability of the structure of the backrest component when the backrest component is not stretched is facilitated; when the backrest component is completely tilted down, the limiting shaft A limits the motion track of the backrest connecting piece B, so that the stability of the structure of the unfolded backrest component is facilitated.

Preferably, the distance between two hinge points formed by hinging the backrest connecting piece A and the backrest connecting piece C with the backrest connecting piece B is 45 mm-60 mm.

Because the size of the functional frame is reduced, the gravity center of the human body moves upwards, the tilting force is insufficient and the stability is poor, the distance between the functional frame and the backrest is set to be 45-60 mm moderately, so that the backrest is easier to tilt and fall, the stability during falling is improved, and the defects of difficult tilting and falling caused by too long distance and poor stability caused by too short distance are avoided.

Preferably, the leg rest assembly comprises three groups of four-bar mechanisms and leg rest members, wherein the three groups of four-bar mechanisms comprise a leg rest plate connecting piece A, a leg rest plate connecting piece B, a leg rest plate connecting piece C, a leg rest plate connecting piece D, a leg rest plate connecting piece E and a leg rest plate connecting piece F; one end of the leg rest plate connecting piece A and one end of the leg rest plate connecting piece B are respectively hinged with the forefront end and the front part of the upper cushion supporting piece, the other end of the leg rest plate connecting piece B is hinged with one end of the leg rest plate connecting piece C, the leg rest plate connecting piece C and the leg rest plate connecting piece A are mutually intersected and hinged at the intersection position, the other end of the leg rest plate connecting piece C is hinged with one end of the leg rest plate connecting piece D, the other end of the leg rest plate connecting piece A is hinged with one end of the leg rest plate connecting piece E, the leg rest plate connecting piece D and the leg rest plate connecting piece E are mutually intersected and hinged at the intersection position, and the other end of the leg rest plate connecting piece D is hinged with one end of the leg rest plate connecting piece F; thus, the upper cushion support, the leg rest plate connecting piece A, the leg rest plate connecting piece B and the leg rest plate connecting piece C form a four-bar mechanism, the leg rest plate connecting piece A, the leg rest plate connecting piece C, the leg rest plate connecting piece D and the leg rest plate connecting piece E form a four-bar mechanism, and the leg rest plate connecting piece D, the leg rest plate connecting piece E, the leg rest plate connecting piece F and the leg rest connecting piece form a four-bar mechanism.

The leg rest commonly used in the market at present adopts one group or two groups of four-bar mechanisms, and the invention adopts three groups of four-bar mechanisms, thereby solving the defect of insufficient length of the leg rest on the premise of downsizing the functional frame.

Preferably, the leg rest board connecting piece E is provided with a limiting shaft B, and the leg rest board connecting piece D abuts against the limiting shaft B in a fully extended state of the leg rest board assembly.

Because the group number of the four-bar mechanisms in the leg rest assembly is more, the longer leg rest assembly is easy to deteriorate in stability and shake, and therefore, a limiting shaft B is arranged between the four-bar mechanisms, the limiting shaft B is used for limiting the movement track of the leg rest connecting piece D, the shaking phenomenon is avoided, and the stability is improved.

Preferably, locking components which are arranged in pairs on the left side and the right side of the fixing frame and are convenient for the leg rest plate components to extend and retract are arranged on the left side and the right side of the fixing frame, and the locking components comprise a four-bar mechanism consisting of a locking connecting piece A, a locking connecting piece B, an upper cushion supporting piece and a leg rest plate connecting piece positioned at the rearmost part of the leg rest plate components; the front end and the rear end of the locking connecting piece A are respectively hinged with the middle part of the leg rest connecting piece and one end of the locking connecting piece B, and one end above the locking connecting piece B and the leg rest connecting piece are respectively hinged with the front middle part and the front part of the upper cushion supporting piece; the distance between the two hinge points of the locking connecting piece B and the leg rest connecting piece respectively hinged with the locking connecting piece A is larger than the distance between the two hinge points of the locking connecting piece B and the leg rest connecting piece respectively hinged with the upper cushion supporting piece.

In the process of folding the leg rest assembly, the hinge points of the locking connecting piece A and the locking connecting piece B rotate upwards and backwards around the hinge points of the locking connecting piece B and the upper cushion supporting piece, and meanwhile, the hinge points of the locking connecting piece A and the leg rest connecting piece move downwards and backwards; when the leg rest assembly is folded and locked, the hinge point position of the locking connecting piece A and the locking connecting piece B is higher than the hinge point position of the locking connecting piece B and the upper cushion supporting piece; in the process of stretching the leg rest assembly, the hinge points of the locking connecting piece A and the locking connecting piece B rotate forwards and downwards around the hinge points of the locking connecting piece B and the upper cushion supporting piece, and meanwhile, the hinge points of the locking connecting piece A and the leg rest connecting piece move forwards until the leg rest assembly is fully stretched; wherein the locking connection a mainly functions as a lock.

Preferably, an extension part is formed at one end above the leg rest plate connecting piece in an extending way, and the inner side of the fixing frame and the extension part are respectively hinged with two ends of a power-assisted connecting piece.

The leg rest assembly is stretched, human body gravity sinks, meanwhile, human body gravity is converted to the footrest, and the power assisting connecting piece can help to push the leg rest assembly to lift up, so that the power assisting effect is achieved.

Preferably, the rear part of the locking connector a and the front part of the booster connector a are respectively connected with two ends of an auxiliary spring a.

An auxiliary spring A is connected between the rear part of the locking connecting piece A and the front part of the power assisting connecting piece, so that the power assisting connecting piece is convenient to provide forward extending spring thrust when the leg rest plate assembly extends, and the locking connecting piece A is convenient to play a role in a certain forward extending spring thrust; when the leg rest assembly is folded, the auxiliary spring A is in a stretched state, and when the leg rest assembly is stretched, the auxiliary spring A is in a relaxed state.

Preferably, the locking connectors A arranged oppositely left and right are fixedly connected through a third cross rod.

To facilitate the accuracy of the synchronous movement of the left and right locking assemblies.

Preferably, an unlocking plate is rotatably connected to the cushion support member on one side of the fixing frame, and when the leg rest plate assembly is folded and locked, the unlocking plate is located above the hinge point of the locking connection member A and the hinge point of the locking connection member B, and when the locking connection member A and the hinge point of the locking connection member B are unlocked, the unlocking plate rotates downwards to prop against the hinge point of the locking connection member A and the hinge point of the locking connection member B until the leg rest plate assembly of the locking assembly extends forwards.

The unlocking mode is simple and convenient to operate

Preferably, the upper end surfaces of the upper cushion support member, the front cushion support member and the rear cushion support member are all in a plane or substantially in a plane; the lower end surfaces of the lower cushion support member, the front cushion support member and the rear cushion support member are all in a plane or basically in a plane.

To minimize the height of the functional rack from which the back rest assembly is removed.

Preferably, the left side and the right side of the fixing frame are side plates which are bilaterally symmetrical, and the leg rest plate component, the cushion supporting component and the backrest component on the same side are positioned on the inner side surfaces of the side plates.

The existing fixing frame generally comprises 4 connecting rods which are connected end to end, and the connecting rods form a rectangular structure; the other side plate is fixedly arranged on the connecting rods at the left side and the right side, or the side plate is formed by extending the connecting rods at the left side and the right side upwards.

The mounting steps for many functional seats are generally: the bottom frame is well beaten, handrails are arranged on two sides of the bottom frame, and a functional frame or a fixing frame is placed between the bottom frame and the handrails to finish the installation of the seat; according to the invention, the two sides of the fixing frame are respectively provided with the independent side plates, and the armrests are arranged on the side plates, so that the defect of poor grounding stability of the armrests adopted at present is avoided, and the stability of the functional frame and the armrests is greatly improved; in addition, as the functional frames are all arranged on the frame at present, a plurality of functional seats cannot be spliced in pairs, and often the functional seats and the non-functional seats or the non-functional seats are spliced, the design of the independent side plates provides a foundation for splicing the functional frames or splicing the independent armrests; the leg rest plate component, the cushion support component and the backrest component on the same side are positioned on the inner side surface of the side plate, which means that the leg rest plate component, the cushion support component and the backrest component are positioned between the two side plates on the same functional frame.

Preferably, at least the front part and the rear part of the outer side surface of the side plate are provided with side plate connectors which can be used for splicing the handrail plug-in connection and the plurality of fixing frames; the handrail is provided with a handrail plug-in unit which can be plugged and matched with the side plate plug-in unit.

The outside at the curb plate sets up the plug connector, the every two adjacent function frame upper side plates concatenation of being convenient for realizes the concatenation between function frame, the function seat promptly to and the grafting connection of handrail.

Preferably, the side plate connectors on the same side of the side plate comprise a male connector and a female connector which can be matched, and the side plate connectors on the same row on the same fixing frame also comprise a male connector and a female connector which can be matched; the connecting line D between the male connectors on the left side plate and the right side plate and the connecting line E between the female connectors on the left side plate and the right side plate are arranged in a crossing way.

Therefore, direct splicing between the splicing pieces of the upper side plates of the adjacent seats can be realized, the number of the spliced seats is not limited, the structure is simple, the splicing is convenient and labor-saving, the splicing and fixing of other parts are not needed, and the product cost is reduced.

Preferably, the handrail plug-in connectors of the handrail positioned on one side are matched male plug-in connectors and female plug-in connectors, and the handrail plug-in connectors of the same row positioned on the same fixing frame are matched male plug-in connectors and female plug-in connectors; the connecting line F between the male connectors on the left and right handrails and the connecting line G between the female connectors on the left and right handrails are arranged in a crossing way.

The handrail splicing device has the advantages that only the handrail splicing piece is required to be matched with the side plate splicing piece, the disassembly and the assembly are very convenient, additional parts are not required, the installation of handrails on two sides after the multi-position seat is spliced is convenient, meanwhile, the installation of the handrails can be matched with each side plate, the universality is strong, and the handrails are very convenient to install on the side plates; meanwhile, the armrests are prevented from being landed, and the stability of the armrests is better.

Preferably, the male plug connector is integrally formed by plastic materials, and the female plug connector is integrally formed by metal materials

The cooperation between the relatively soft plastic material and the hard metal material can avoid abnormal sound and reduce friction between the male plug connector and the female plug connector.

Preferably, the upper end surfaces of the side plates are provided with bolt holes, and the same bolt piece is simultaneously inserted into the bolt holes on two adjacent side plates which are positioned on the adjacent fixing frames; the side plate connectors are arranged at least on the front part and the rear part of the outer side surface of the side plate.

The arrangement of the bolt holes and the bolt pieces further realizes the splicing of adjacent functional frames, improves the firmness and stability of the splicing and prolongs the service life; at least the front part and the rear part of the outer side surface of the side plate are set as splicing points, and the splicing points are at least distributed around the seat, so that the firmness and the stability after splicing are facilitated.

Preferably, the outer side surface of the side plate is provided with uniformly distributed supporting feet.

The supporting legs raise the whole functional rack, so that the internal structure of the functional rack can be conveniently stretched; the upper end face of the supporting leg can be provided with holes to form bolt holes, so that parts are saved, occupied space is reduced, and cost is reduced.

Preferably, the fixing frame comprises four connecting rods connected end to form a rectangular structure, wherein the connecting rods on the left side and the right side are connected with side plates, or the connecting rods on the left side and the right side extend upwards to form side plates, and the connecting rods arranged transversely are called as cross rods.

Preferably, the cross bars at least comprise a first cross bar, a second cross bar, a fourth cross bar and a fifth cross bar; the lower cushion support pieces which are oppositely arranged left and right are fixedly connected through a first cross rod, leg rest plate connecting pieces B which are oppositely arranged left and right are fixedly connected through a second cross rod, the front parts of the side plates which are oppositely arranged left and right are fixedly connected through a fourth cross rod, and the rear parts of the side plates which are oppositely arranged left and right are fixedly connected through a fifth cross rod.

The whole firmness and stability of the fixing frame, namely the stability of the seat, are improved, and the accuracy of synchronous movement of each component on the left side and the right side is improved.

Preferably, a driving assembly is arranged in the fixing frame and comprises a driving motor, a driving base, a driving guide rail and a driving shaft, the driving motor is connected with the driving base, one end of the driving base is fixedly connected with one end of the driving guide rail, the other end of the driving base is hinged with a fifth cross rod positioned behind the fixing frame, one end of the driving shaft is inserted from the other end of the driving guide rail and is sleeved in the driving guide rail in a sliding manner, and the other end of the driving shaft is hinged with the second cross rod.

The effort of a user to operate the function rack is reduced, and the intelligent and efficient functions are realized.

Preferably, an auxiliary spring B is connected between the rear portion of the upper cushion support member and the fifth cross bar, and a plurality of connecting holes for connecting one end of the auxiliary spring B are sequentially arranged at the rear portion of the upper cushion support member.

In the running process of stretching and folding of the leg rest plate component, the cushion supporting component and the backrest component in the motor plate functional frame, gaps among connecting pieces of the leg rest plate component, the cushion supporting component and the backrest component can cause shaking in the motion conversion process (namely the moment of stretching and folding), so that the auxiliary spring B is arranged to be beneficial to eliminating the assembly gaps among the related connecting pieces, playing a pre-tightening role and enabling the motion to be smoother; the auxiliary spring B is further provided with a plurality of connecting holes which are sequentially arranged from front to back, and the spring force of the auxiliary spring B is adjusted according to different distances between the connecting holes and the fifth cross rod.

A seat comprises the functional rack, wherein leg rest plates are arranged on two leg rest plate assemblies which are arranged oppositely left and right, and a foot rest plate is arranged on the foot rest; the seat cushion is arranged on the two seat cushion supporting components which are oppositely arranged left and right, and the upper ends of the two backrest components which are oppositely arranged left and right are provided with backrest; armrests are inserted on the two side plates which are oppositely arranged left and right.

The leg rest, the foot rest, the cushion, the backrest and the armrests are arranged on the functional frame, so that the basic installation structure of the seat is completed, and the functionality and the comfort of the seat are improved; the seat has low height and long sitting depth.

The invention adopts the technical proposal that the invention has the beneficial effects that:

The invention provides a functional frame and a chair which are low, smooth in operation and labor-saving in tilting recovery. The invention limits the height of the functional frame so as to be suitable for the low seat; in particular to a functional frame which is shorter in height, smooth in operation, comprehensive in extension, labor-saving in tilting recovery and comfortable; firstly, as the height of the functional rack is reduced, the height of the original leg rest assembly after being folded is higher than the height of the functional rack, the phenomena of touching the ground and the like exist, and the expansion and the folding of the leg rest assembly cannot be well realized, so that the size of a connecting piece in the original leg rest assembly is required to be reduced, but the length of the reduced leg rest assembly after being expanded is also influenced, and the comfort is influenced; meanwhile, the height of the functional frame is shortened, so that unsmooth and laborious backrest recovery and the like are often caused, and therefore, the invention is also provided with backrest auxiliary components on the left side and the right side of the fixing frame, so that the functional frame can run smoothly and save labor when tilting and recovering, and is simultaneously applicable to non-electric functional frames and electric functional frames.

Drawings

Fig. 1 is a schematic structural diagram of the initial state of the functional rack of embodiment 1;

FIG. 2 is a schematic view of the structure of embodiment 1 with one side plate removed;

fig. 3 is a schematic view of the structure of embodiment 1 with the upper cushion support removed;

FIG. 4 is a schematic side elevational view of FIG. 2;

FIG. 5 is a schematic view of the leg rest assembly of example 1 after extension;

FIG. 6 is another schematic view of the leg rest assembly of FIG. 5 after extension;

FIG. 7 is a schematic view of the structure of FIG. 5 with one side plate removed;

FIG. 8 is a schematic side elevational view of FIG. 7;

FIG. 9 is a schematic view of the leg rest assembly and backrest assembly of example 1 after being fully extended;

FIG. 10 is a schematic view of the structure of FIG. 9 with one side panel removed;

FIG. 11 is a schematic side elevational view of FIG. 10;

FIG. 12 is an enlarged schematic view of the portion A of FIG. 11;

FIG. 13 is a schematic view of the structure of the middle mount and leg rest assembly, cushion support assembly, back assembly, side plate plug;

fig. 14 is a schematic structural view of two fixing frames after being spliced;

FIG. 15 is a schematic view of the structure between the armrest, armrest connectors, and reinforced steel plates;

FIG. 16 is a schematic view showing the structure between the fixing frame and the side plate with one side armrest removed;

FIG. 17 is an enlarged view of the portion B of FIG. 14;

FIG. 18 is a schematic view of the construction of the latch member;

FIG. 19 is a schematic view showing the structure of the male plug member in embodiment 1;

FIG. 20 is a schematic front view of the male connector in embodiment 1;

FIG. 21 is a schematic structural view of a female plug member in embodiment 1;

FIG. 22 is a schematic front view of the female connector in embodiment 1;

Fig. 23 is a schematic structural view of an electric function rack of embodiment 2;

fig. 24 is a schematic view showing the structure of the bottom of the electric function rack of embodiment 2.

Detailed Description

The specific embodiments of the present invention are as follows:

The azimuthal words such as "up", "down", "front", "rear" and the like in this embodiment 1 are described in terms of the user's view after sitting in the seat, for example, the front of the user is "front"; the related wires a, B, C, D, E, F, and G are virtual wires for better understanding of the present embodiment.

Example 1:

1-2, including mount 100, the left and right sides of mount 100 is equipped with leg rest subassembly 200, cushion supporting component 300 and back subassembly 400 that set up in pairs about, and the front and back both ends of cushion supporting component 300 are articulated with one end of leg rest subassembly 200 and back subassembly 400 respectively, its characterized in that: the vertical distance between the reference surface of the cushion support assembly 300 and the lowest point of the functional frame is 174mm, excluding the rear seatback assembly 400; the leg rest assembly 200 is composed of a plurality of groups of four-bar mechanisms, and the highest point of the leg rest assembly 200 and the highest point of the cushion support assembly 300 are approximately positioned on the same horizontal plane when the leg rest assembly is in a folded state; the cushion support assembly 300 includes an upper cushion support 310, a lower cushion support 320, a front cushion support 330, and a rear cushion support 340 that make up a four-bar linkage; back auxiliary components 500 which are arranged in pairs on the left and right sides of the fixing frame 100 and are convenient for leaning back and recovering are arranged on the left and right sides; wherein the upper end surfaces of the upper cushion support 310, the front cushion support 330 and the rear cushion support 340 are all in substantially one plane; the lower end surfaces of the lower cushion support 320, the front cushion support 330 and the rear cushion support 340 are substantially in one plane.

Specifically, as shown in fig. 2, the backrest assistance assembly 500 is disposed between the lower cushion support 320 and the inside of the ipsilateral mount 100; the seatback assistance assembly 500 includes a first seatback assistance assembly 510 and a second seatback assistance assembly 520 that are coupled to the rear and front portions, respectively, of the lower cushion support 320.

Wherein, as shown in fig. 2-4, the backrest auxiliary assembly 500 is disposed between the lower cushion support 320 and the inside of the ipsilateral bracket 100; the back support assembly 500 includes only the first back support assembly 510, or only the second back support assembly 520, or both the first and second back support assemblies 510 and 520 that are connected to the rear and front portions of the lower cushion support 320, respectively.

The first backrest auxiliary assembly 510 includes a sliding rail 511 fixedly disposed at the rear portion of the inner side of the fixed frame 100 and a pulley 512 rotatably connected to the rear portion of the lower cushion support 320, wherein the pulley 512 is disposed in the sliding rail 511 and can slide along the sliding rail 511; the track of the front part of the slide rail 511 is an arc 5111, the track of the rest of the slide rail 511 is a straight line 5112, the whole slide rail 511 is in a shape of a slope with a front high bottom and a rear low bottom, and two ends of the slide rail 511 are provided with limiting devices 513 for preventing the pulley 512 from sliding out of the slide rail 511; in order to better realize the technical effect of smoothly returning to labor saving when the backrest component in the low functional rack is tilted, through the experiments of great effort and financial resources, the following data can very effectively and very advantageously enable the backrest component to be tilted and reset, specifically, the included angle range of the straight line 5112 part of the sliding rail 511 or the arc line tending to be straight with the horizontal plane is 15 degrees, the arc radius of the arc line 5111 part of the front part of the sliding rail 511 is 60mm, and the length ratio of the arc length of the arc line 5111 part of the front part of the sliding rail 511 to the length of the straight line 5112 part of the rest part is 1/4.

As shown in fig. 2-4, 7-9, and 11-12, the second backrest auxiliary assembly 520 includes an auxiliary connector a521, an auxiliary connector B522, and an auxiliary connector C523, wherein the auxiliary connector B522 has a crank structure with a bending portion a5221 and a forward opening; one end of the auxiliary connecting piece A521 and one end of the auxiliary connecting piece C523 are hinged with the inner side of the same-side fixing frame 100, the other end of the auxiliary connecting piece A521 and the other end of the auxiliary connecting piece C523 are respectively hinged with the upper end of the auxiliary connecting piece B522 and the bending part A5221 of the auxiliary connecting piece B522, and the other end of the auxiliary connecting piece B522 is hinged with the front part of the lower cushion support piece 320; wherein, the hinge point of the auxiliary connecting piece a521 and the fixing frame 100 is located at the rear of the hinge point of the auxiliary connecting piece C523 and the fixing frame 100, and the hinge point of the auxiliary connecting piece a521 and the auxiliary connecting piece B522 is located above the hinge point of the auxiliary connecting piece C523 and the fixing frame 100; when the backrest assembly is completely reclined, the connection line between the hinge point between the auxiliary connection member a521 and the auxiliary connection member B522 and the hinge point between the auxiliary connection member C523 and the auxiliary connection member B522 is the connection line a524, the connection line between the hinge point between the auxiliary connection member C523 and the auxiliary connection member B522 and the hinge point between the auxiliary connection member C523 and the fixed frame 100 is the connection line B525, and the included angle between the connection line a524 and the connection line B525 is 4 ° (not shown); the connection line between the hinge point between the auxiliary connection member a521 and the auxiliary connection member B522 and the hinge point between the auxiliary connection member C523 and the fixing frame 100 is a connection line C526, and an included angle between the connection line C526 and the vertical line 527 is 9 ° (not shown).

Meanwhile, as shown in fig. 1 to 4, in order to save effort in operation of the backrest assembly 400, a certain design is made on the backrest itself, the backrest assembly 400 includes a backrest connecting member a410, a backrest connecting member B420, a backrest connecting member C430, a backrest connecting member D440 and a backrest connecting member E450, the backrest connecting member C430 has a crank structure with a bent portion B431 and a forward opening, and the backrest connecting member D440 is an extension portion of the upper cushion supporting member 310 that is inclined obliquely upward; the two ends of the backrest connecting piece A410 are respectively hinged with one end of the backrest connecting piece B420 and the front part of the backrest connecting piece D440; one end of the backrest connecting piece C430 is hinged with the middle part of the backrest connecting piece B420, the other end of the backrest connecting piece C430 is hinged with one end of the backrest connecting piece E450, the bending part B431 is hinged with the tail end of the backrest connecting piece D440, the other end of the backrest connecting piece E450 is hinged with the same-side fixing frame 100, and the backrest connecting piece A410, the backrest connecting piece B420, the backrest connecting piece C430 and the backrest connecting piece D440 form a four-bar mechanism; the distance between two hinge points formed by the hinge connection of the backrest connecting piece A410 and the hinge connection of the backrest connecting piece C440 and the backrest connecting piece B420 is 49.5mm, so that the backrest is easier to tilt and fall, and meanwhile stability in falling is improved.

As shown in fig. 4 and 8, in order to ensure the stability of the backrest assembly in the unfolded or undeployed state, a limiting shaft a411 is provided on the backrest connecting member a410, and a limiting rod 421 is formed by extending the end of the backrest connecting member B420 hinged to the backrest connecting member a 410; when the backrest assembly 400 is in an initial state or only the leg rest assembly 200 is extended, the limit rod 421 abuts against the limit shaft a 411; when the backrest module 400 is fully reclined, the backrest connecting member B420 abuts against the limiting shaft a 411.

As shown in fig. 4-9, the leg rest assembly 200 includes three sets of four bar linkages consisting of a leg rest plate connector a210, a leg rest plate connector B220, a leg rest plate connector C230, a leg rest plate connector D240, a leg rest plate connector E250, and a leg rest plate connector F260, and a leg rest 270; one ends of the leg rest plate connector A210 and the leg rest plate connector B220 are respectively hinged with the forefront end and the front part of the upper cushion support member 310, the other end of the leg rest plate connector B220 is hinged with one end of the leg rest plate connector C230, the leg rest plate connector C230 and the leg rest plate connector A210 are mutually intersected and hinged at the intersection position, the other end of the leg rest plate connector C230 is hinged with one end of the leg rest plate connector D240, the other end of the leg rest plate connector A210 is hinged with one end of the leg rest plate connector E250, the leg rest plate connector D240 and the leg rest plate connector E250 are mutually intersected and hinged at the intersection position, the other end of the leg rest plate connector D240 is hinged with one end of the leg rest plate connector F260, and the other ends of the leg rest plate connector E250 and the leg rest plate connector F260 are connected with the leg rest member 270; thus, the upper cushion support 310, the leg rest plate connector a210, the leg rest plate connector B220, and the leg rest plate connector C230 form a four-bar linkage, the leg rest plate connector a210, the leg rest plate connector C230, the leg rest plate connector D240, and the leg rest plate connector E250 form a four-bar linkage, and the leg rest plate connector D240, the leg rest plate connector E250, the leg rest plate connector F260, and the leg rest 270 form a four-bar linkage.

As shown in fig. 11, the leg rest connecting member E250 is provided with a limiting shaft B251, and in the fully extended state of the leg rest assembly 200, the leg rest connecting member D240 abuts against the limiting shaft B251.

As shown in fig. 2 to 10, in order to facilitate the extension and retraction of the leg rest assembly, the left and right sides of the fixing frame 100 are provided with locking assemblies 600 which are arranged in pairs left and right to facilitate the extension and retraction of the leg rest assembly 200, and the locking assemblies 600 include a four bar linkage mechanism consisting of locking connectors a610, locking connectors B620, upper cushion support 310 and a leg rest connector located at the rearmost side of the leg rest assembly 200; the front and rear ends of the locking connector A610 are respectively hinged with the middle part of the leg rest board connector and one end of the locking connector B620, and the upper ends of the locking connector B620 and the leg rest board connector are respectively hinged with the front middle part and the front part of the upper cushion support member 310; the distance between the two hinge points at which the locking connection B620 and the leg rest connection are respectively hinged to the locking connection a610 is greater than the distance between the two hinge points at which the locking connection B620 and the leg rest connection are respectively hinged to the upper cushion support 310.

As shown in fig. 1-3 and fig. 5-10, an extension part 221 is formed at one end of the upper part of the leg rest connecting member in an extending manner, and the inner side of the fixing frame 100 and the extension part 221 are respectively hinged with two ends of a power-assisted connecting member 700; the rear part of the locking connector A610 and the front part of the power-assisted connector 700 are respectively connected with two ends of an auxiliary spring A800; the leg rest assembly is stretched, human body gravity is sunk, and meanwhile, the human body gravity is converted to the footrest, and the power-assisted connecting piece can help to push the leg rest assembly to be lifted; while the locking connectors a610 disposed opposite to each other are fixedly connected to each other by a third cross bar 611.

For the non-electric functional seat, as shown in fig. 2, 3 and 6, an unlocking plate 630 is rotatably connected to the cushion support 310 at one side of the fixing frame 100, when the leg rest assembly 200 is folded and locked, the unlocking plate 630 is located above the hinge point of the locking connection a610 and the locking connection B620, and when unlocked, the unlocking plate 630 is rotated downward against the hinge point of the locking connection a610 and the locking connection B620 until the leg rest assembly 200 of the locking assembly extends forward.

For splicing the functional chairs, as shown in fig. 1, the left and right sides of the fixing frame 100 are side plates 110 that are symmetrical left and right, the leg rest assembly 200, the cushion support assembly 300 and the backrest assembly 400 on the same side are located on the inner side surfaces of the side plates 110, and the outer side surfaces of the side plates 110 are provided with uniformly distributed support legs 140.

As shown in fig. 13-18, a side plate connector 111 which can be used for inserting connection of the handrail 900 and inserting and splicing among a plurality of fixing frames is arranged on the front part and the rear part of the outer side surface of the side plate 110; a handrail plug-in unit 910 which can be plugged and matched with the side plate plug-in unit 111 is arranged on the handrail 900, a reinforced steel plate 920 is fixedly arranged on the inner side surface of the handrail 900, and the handrail plug-in unit 910 is fixedly connected with the reinforced steel plate 920; the side board connectors 111 positioned on the same side of the side board 110 comprise a male connector 1111 and a female connector 1112 which can be matched, and the side board connectors 111 positioned on the same row on the same fixing frame 100 also comprise a male connector 1111 and a female connector 1112 which can be matched; the connection line D1111A between the male connectors 1111 on the left and right side plates 110 and the connection line E1112A between the female connectors 1112 on the left and right side plates are arranged in a crossing manner; the armrest connectors 910 of the armrest 900 on one side are matched male connectors 911 and female connectors 912, and the armrest connectors 900 on the same row of the fixing frame 100 are matched male connectors 911 and female connectors 912; the connection line F between the male connectors 911 on the left and right armrests 900 and the connection line G between the female connectors 912 on the left and right armrests 900 are arranged in a crossing manner; the male connector 1111,911 is integrally formed with a plastic material, and the female connector 1112,912 is integrally formed with a metal material.

As shown in fig. 19-22, the male plug 1111 is hollow 1113, and the male plug 1111 has an opening a1114 and an opening B1115 on an upper end surface of the male plug 911 and a surface facing the female plug, and the opening a1114 is connected with the opening B1115; female plug 1112, female plug 912 is a bar block structure with hollowed-out portions; the width of the hollow structure 1113 decreases sequentially from top to bottom.

Further, as shown in fig. 13 to 18, bolt holes 120 are formed on the upper end surface or the side surface of the side plate 110, and the same bolt member 130 is simultaneously inserted into the bolt holes 120 on two adjacent side plates 110 positioned on the adjacent fixing frame 100; the side plate connectors 111 are provided at least on the front and rear portions of the outer side surfaces of the side plates 110. The bolt hole 120 is made of metal, the bolt member 130 is made of plastic, so that abnormal noise can be avoided, friction can be reduced, and more specifically, the upper end of the supporting leg 140 is provided with a hole, so that the bolt hole 120 is formed.

Further, as shown in fig. 1 and 5, the fixing frame 100 includes four connecting rods connected end to form a rectangular structure, wherein the connecting rods on the left and right sides are connected with the side plates 110, or the connecting rods on the left and right sides extend upwards to form the side plates 110, and the connecting rods arranged transversely are called as cross bars; in order to ensure the stability and balance of the overall operation of the functional rack, the cross bars at least comprise a first cross bar 321, a second cross bar 222, a fourth cross bar 112 and a fifth cross bar 113; the lower cushion supporting members 320 which are oppositely arranged left and right are fixedly connected through the first cross rod 321, the leg rest plate connecting members B220 which are oppositely arranged left and right are fixedly connected through the second cross rod 222, the front parts of the side plates 110 which are oppositely arranged left and right are fixedly connected through the fourth cross rod 112, and the rear parts of the side plates 110 which are oppositely arranged left and right are fixedly connected through the fifth cross rod 113.

The operation process of the functional frame is as follows:

Footrest assembly 200 portion: the unlocking plate 630 is depressed to the hinge point between the locking link a610 and the locking link B620, which is rotated downward about the hinge point between the locking link B620 and the upper cushion support 310, while the hinge point between the locking link a610 and the footrest link B220 is moved forward until the leg rest plate assembly 200 is fully extended, as shown in fig. 5-8; simultaneously, the upper hinge points of the front cushion support 330 and the rear cushion support 340 move forward and downward, which drives the upper cushion support 310 to move forward and downward, and the backrest connecting member E450 moves forward and downward, which drives the backrest assembly 200 to move forward and downward; the footrest assembly 200 can then be moved further forward and upward using the back rest assembly 400.

Backrest assembly 400 portion:

The gravity presses the backrest connecting member B420, the four bar linkage composed of the backrest connecting member B420, the backrest connecting member a410, the backrest connecting member C430 and the backrest connecting member D440, and the backrest connecting member E450 move forward and downward, and at the same time, the pulley 512 slides forward and upward in the slide rail 511; the hinge point of the backrest connecting piece B420 and the backrest connecting piece C430 moves forwards and upwards, and as the backrest connecting piece B420 is of a crank structure, the hinge point of the backrest connecting piece A410 and the backrest connecting piece B420 and the hinge point of the backrest connecting piece B420 and the upper cushion connecting piece 310 are driven to move forwards and upwards; at the same time, the entire cushion support assembly 300, the locking assembly 600, and the leg rest assembly 200 are driven to move forward and upward as shown in fig. 9-11.

The invention realizes the effects of smooth operation of the low functional frame, labor saving in tilting and returning, and adaptation to the change of the height of the backrest.

A seat comprising the functional rack, wherein the leg rest boards are arranged on the two leg rest board assemblies 200 which are arranged oppositely left and right, and the leg rest 270 is provided with the leg rest board; the seat cushion is arranged on the two seat cushion support assemblies 300 which are arranged oppositely left and right, and the backrest is arranged at the upper ends of the two backrest assemblies 400 which are arranged oppositely left and right; as shown in fig. 16, a handrail 900 is inserted into the two side plates 110 disposed opposite to each other.

Example 2:

Example 2 differs from example 1 in that:

As shown in fig. 23 to 24, a driving assembly 2000 is disposed in the fixing frame 100, the driving assembly 2000 includes a driving motor 2100, a driving base 2200, a driving rail 2300, and a driving shaft 2400, the driving motor 2100 is connected to the driving base 2200, one end of the driving base 2200 is fixedly connected to one end of the driving rail 2300, the other end of the driving base 2200 is hinged to the fifth cross bar 113 located at the rear of the fixing frame 100, one end of the driving shaft 2400 is inserted from the other end of the driving rail 2300 and is slidably sleeved in the driving rail 2300, and the other end of the driving shaft 2400 is hinged to the second cross bar 222.

An auxiliary spring B1000 is connected between the rear portion of the lower cushion support 320 and the fifth cross bar 113, and a plurality of connection holes 311 are provided at the rear portion of the upper cushion support 310, which are sequentially arranged in front and rear for connecting one end of the auxiliary spring 1000; in the operation process of stretching and folding the leg rest assembly 200, the cushion support assembly 300 and the backrest assembly 400 in the motor function frame, gaps among the connecting pieces of the leg rest assembly 200, the cushion support assembly 300 and the backrest assembly 400 can cause shaking in the motion conversion process, namely, the stretching and folding moments, so that the auxiliary spring B1000 is arranged to be beneficial to eliminating the assembly gaps among the related connecting pieces, and a pre-tightening effect is achieved, so that the motion is smoother.

Regarding the extension and retraction of the function rack, the technical solution of embodiment 1 can be implemented only by starting the driving motor 2100, and the application of the technical solution to the electric function rack can make the operation of the electric function rack smoother and more unobstructed.

Claims

1. The utility model provides a functional rack, includes mount (100), and the left and right sides of mount (100) is equipped with leg rest board subassembly (200), cushion supporting component (300) and back subassembly (400) that set up in pairs about, and both ends are articulated with the one end of leg rest board subassembly (200) and back subassembly (400) respectively around cushion supporting component (300), its characterized in that: the back rest component (400) at the rear part is removed, and the vertical distance between the reference surface of the cushion support component (300) and the lowest point of the functional frame is 170-220 mm; the leg rest assembly (200) is composed of a plurality of groups of four-bar mechanisms, and the highest point of the leg rest assembly (200) is lower than the highest point of the cushion support assembly (300) or is approximately on the same horizontal plane with the highest point of the cushion support assembly (300) when the leg rest assembly is in a folded state; the cushion support assembly (300) comprises an upper cushion support (310), a lower cushion support (320), a front cushion support (330) and a rear cushion support (340) which form a four-bar mechanism; back support auxiliary components (500) which are arranged in pairs on the left side and the right side of the fixing frame (100) and are convenient for leaning back and recovering are arranged on the left side and the right side of the fixing frame;

The backrest auxiliary assembly (500) is arranged between the lower cushion support (320) and the inner side of the same-side fixing frame (100); the backrest assistance assembly (500) includes only the first backrest assistance assembly (510), or both the first backrest assistance assembly (510) and the second backrest assistance assembly (520) connected to the rear and front portions of the lower cushion support (320), respectively;

the first backrest auxiliary assembly (510) comprises a sliding rail (511) fixedly arranged at the rear part of the inner side of the fixed frame (100) and a pulley (512) rotatably connected at the rear part of the lower cushion support piece (320);

The track at the front part of the sliding rail (511) is an arc line (5111); the track of the rest part of the sliding rail (511) is a straight line (5112) or an arc line which tends to be straight, and the sliding rail (511) is in an inclined shape with a front high and a rear low;

the included angle between the straight line (5112) part of the sliding rail (511) or the arc line tending to be straight line and the horizontal plane is in the range of ；

The arc radius of the arc line (5111) at the front part of the sliding rail (511) is 40-150 mm.

2. A function rack according to claim 1, wherein: the pulley (512) is disposed within the slide rail (511) and is slidable along the slide rail (511).

3. A function rack according to claim 1, wherein: the arc length of the arc line (5111) part at the front part of the sliding rail (511) and the length ratio of the straight line (5112) part of the rest part or the arc line part tending to be straight line is l/6-1/2.

4. A function rack according to claim 2, wherein: limiting devices (513) for preventing the pulley (512) from sliding out of the sliding rail (511) are arranged at two ends of the sliding rail (511).

5. A function rack according to claim 1, wherein: the second backrest auxiliary assembly (520) comprises an auxiliary connecting piece A (521), an auxiliary connecting piece B (522) and an auxiliary connecting piece C (523), wherein the auxiliary connecting piece B (522) is of a crank structure which is provided with a bending position A (5221) and is opened forwards; one end of the auxiliary connecting piece A (521) and one end of the auxiliary connecting piece C (523) are hinged with the inner side of the same-side fixing frame (100), the other end of the auxiliary connecting piece A (521) and the other end of the auxiliary connecting piece C (523) are respectively hinged with the upper end of the auxiliary connecting piece B (522) and a bending part A (5221) of the auxiliary connecting piece B, and the other end of the auxiliary connecting piece B (522) is hinged with the front part of the lower cushion supporting piece (320); the hinge point of the auxiliary connecting piece A (521) and the fixing frame (100) is located at the rear of the hinge point of the auxiliary connecting piece C (523) and the fixing frame (100), and the hinge point of the auxiliary connecting piece A (521) and the auxiliary connecting piece B (522) is located above the hinge point of the auxiliary connecting piece C (523) and the fixing frame (100).

6. A function rack according to claim 5, wherein: when the backrest assembly is completely reclined, a connecting line of a hinge point between the auxiliary connecting piece A (521) and the auxiliary connecting piece B (522) and a connecting line of a hinge point between the auxiliary connecting piece C (523) and the auxiliary connecting piece B (522) are connecting lines A (524), a connecting line of a hinge point between the auxiliary connecting piece C (523) and the auxiliary connecting piece B (522) and a connecting line of a hinge point between the auxiliary connecting piece C (523) and the fixed frame (100) are connecting lines B (525), and an included angle between the connecting line A (524) and the connecting line B (525) is smaller than 50; the connecting line of the hinging point between the auxiliary connecting piece A (521) and the auxiliary connecting piece B (522) and the hinging point between the auxiliary connecting piece C (523) and the fixing frame (100) is a connecting line C (526), and the included angle between the connecting line C (526) and the vertical perpendicular line (527) is smaller than 10 degrees.

7. A function rack according to claim 1, wherein: the backrest assembly (400) comprises a backrest connecting piece A (410), a backrest connecting piece B (420), a backrest connecting piece C (430), a backrest connecting piece D (440) and a backrest connecting piece E (450), wherein the backrest connecting piece C (430) is of a crank structure with a bending part B (431) and a forward opening, and the backrest connecting piece D (440) is an extension part of the rear part of the upper cushion supporting piece (310) which is inclined upwards; two ends of the backrest connecting piece A (410) are respectively hinged with one end of the backrest connecting piece B (420) and the front part of the backrest connecting piece D (440); one end of the backrest connecting piece C (430) is hinged with the middle part of the backrest connecting piece B (420), the other end of the backrest connecting piece C is hinged with one end of the backrest connecting piece E (450), the bending part B (431) of the backrest connecting piece C is hinged with the tail end of the backrest connecting piece D (440), the other end of the backrest connecting piece E (450) is hinged with the same-side fixing frame (100), and the backrest connecting piece A (410), the backrest connecting piece B (420), the backrest connecting piece C (430) and the backrest connecting piece D (440) form a four-bar mechanism.

8. A function rack according to claim 7, wherein: a limit shaft A (411) is arranged on the backrest connecting piece A (410), and a limit rod (421) is formed by extending the end of the backrest connecting piece B (420) hinged with the backrest connecting piece A (410); when the backrest assembly (400) is in an initial state or only the leg rest assembly (200) is stretched, the limiting rod (421) is propped against the limiting shaft A (411); when the backrest assembly (400) is completely tilted down, the backrest connecting piece B (420) is propped against the limiting shaft A (411).

9. A function rack according to claim 7, wherein: the distance between two hinge points formed by hinging the backrest connecting piece A (410) and the backrest connecting piece C (440) with the backrest connecting piece B (420) is 45-60 mm.

10. A function rack according to claim 1, wherein: the leg rest assembly (200) comprises three groups of four-bar mechanisms and leg rests (270) consisting of a leg rest connecting piece A (210), a leg rest connecting piece B (220), a leg rest connecting piece C (230), a leg rest connecting piece D (240), a leg rest connecting piece E (250) and a leg rest connecting piece F (260); one end of the leg rest plate connecting piece A (210) and one end of the leg rest plate connecting piece B (220) are respectively hinged with the forefront end and the front part of the upper cushion supporting piece (310), the other end of the leg rest plate connecting piece B (220) is hinged with one end of the leg rest plate connecting piece C (230), the leg rest plate connecting piece C (230) and the leg rest plate connecting piece A (210) are mutually intersected and hinged at the intersected position, the other end of the leg rest plate connecting piece C (230) is hinged with one end of the leg rest plate connecting piece D (240), the other end of the leg rest plate connecting piece A (210) is hinged with one end of the leg rest plate connecting piece E (250), the leg rest plate connecting piece D (240) and the leg rest plate connecting piece E (250) are mutually intersected and hinged at the intersected position, the other end of the leg rest plate connecting piece D (240) is hinged with one end of the leg rest plate connecting piece F (260), and the other ends of the leg rest plate connecting piece E (250) and the leg rest plate connecting piece F (260) are connected with the leg rest plate connecting piece (270); thus, the upper cushion support member (310), the leg rest plate connecting member A (210), the leg rest plate connecting member B (220) and the leg rest plate connecting member C (230) form a four-bar mechanism, the leg rest plate connecting member A (210), the leg rest plate connecting member C (230), the leg rest plate connecting member D (240) and the leg rest plate connecting member E (250) form a four-bar mechanism, and the leg rest plate connecting member D (240), the leg rest plate connecting member E (250), the leg rest plate connecting member F (260) and the leg rest member (270) form a four-bar mechanism.

11. A function rack according to claim 10, wherein: the leg rest connecting piece E (250) is provided with a limiting shaft B (251), and the leg rest connecting piece D (240) is propped against the limiting shaft B (251) in the state that the leg rest assembly (200) is fully extended.

12. A function rack according to claim 1, wherein: the left side and the right side of the fixing frame (100) are provided with locking assemblies (600) which are arranged in pairs left and right and are convenient for the leg rest plate assemblies (200) to extend and retract, and the locking assemblies (600) comprise a four-bar mechanism consisting of a locking connecting piece A (610), a locking connecting piece B (620), an upper cushion supporting piece (310) and a leg rest plate connecting piece positioned at the rearmost part of the leg rest plate assemblies (200); the front end and the rear end of the locking connecting piece A (610) are respectively hinged with the middle part of the leg rest connecting piece and one end of the locking connecting piece B (620), and one end above the locking connecting piece B (620) and the leg rest connecting piece are respectively hinged with the front middle part and the front part of the upper cushion supporting piece (310); the distance between the two hinge points of the locking connecting piece B (620) and the leg rest connecting piece respectively hinged with the locking connecting piece A (610) is larger than the distance between the two hinge points of the locking connecting piece B (620) and the leg rest connecting piece respectively hinged with the upper cushion supporting piece (310).

13. A function rack according to claim 12, wherein: an extension part (221) is formed at one end above the leg rest connecting piece in an extending way, and the inner side of the fixing frame (100) and the extension part (221) are respectively hinged with two ends of a power-assisted connecting piece (700).

14. A utility rack as claimed in claim 13, wherein: the rear part of the locking connection member A (610) and the front part of the power assisting connection member (700) are respectively connected with two ends of an assisting spring A (800).

15. A function rack according to claim 12, wherein: the locking connecting pieces A (610) which are oppositely arranged at the left and the right are fixedly connected through a third cross rod (611).

16. A function rack according to claim 12, wherein: an unlocking plate (630) is rotatably connected to the cushion support (310) on one side of the fixing frame (100), when the leg rest plate assembly (200) is folded and locked, the unlocking plate (630) is located above the hinge point of the locking connecting piece A (610) and the locking connecting piece B (620), and when the seat is unlocked, the unlocking plate (630) rotates downwards to prop against the hinge point of the locking connecting piece A (610) and the locking connecting piece B (620) until the leg rest plate assembly (200) of the locking assembly stretches forwards.

17. A function rack according to claim 1, wherein: the upper end surfaces of the upper cushion support piece (310), the front cushion support piece (330) and the rear cushion support piece (340) are all positioned on the same plane; the lower end surfaces of the lower cushion support (320), the front cushion support (330) and the rear cushion support (340) are all positioned on the same plane.

18. A function rack according to claim 1, wherein: the left side and the right side of the fixing frame (100) are side plates (110) which are symmetrical left and right, and the leg rest plate component (200), the cushion supporting component (300) and the backrest component (400) on the same side are positioned on the inner side surfaces of the side plates (110).

19. A utility rack as claimed in claim 18, wherein: at least the front part and the rear part of the outer side surface of the side plate (110) are provided with side plate connectors (111) which can be used for splicing the handrail (900) and splicing a plurality of fixing frames (100); the armrest (900) is provided with an armrest plug connector (910) which can be plugged and matched with the side plate plug connector (111).

20. A utility rack as claimed in claim 19, wherein: the side plate connectors (111) positioned on the same side of the side plate (110) comprise a matched first male connector (1111) and a matched first female connector (1112), and the side plate connectors (111) positioned on the same row on the same fixing frame (100) also comprise a matched first male connector (1111) and a matched first female connector (1112); the connection line D (1111A) between the first male connectors (1111) on the left and right side plates (110) and the connection line E (1112A) between the first female connectors (1112) on the left and right side plates are arranged in a crossing manner.

21. A utility rack as claimed in claim 19, wherein: the handrail plug-in pieces (910) positioned on one side handrail (900) are matched second male plug-in pieces (911) and second female plug-in pieces (912), and the handrail plug-in pieces (900) positioned on the same fixed frame (100) are matched second male plug-in pieces (911) and second female plug-in pieces (912); the connection line F between the second male connectors (911) on the left and right armrests (900) and the connection line G between the second female connectors (912) on the left and right armrests (900) are arranged in a crossing manner.

22. A utility rack as claimed in claim 20 or 21, wherein: the first male plug connector (1111,911) and the second male plug connector (1112,912) are integrally formed by plastic materials, and the first female plug connector and the second female plug connector are integrally formed by metal materials.

23. A functional rack as claimed in claim 18 or 19 or 20 or 21, wherein: the upper end surfaces or the side surfaces of the side plates (110) are provided with bolt holes (120), and the same bolt piece (130) is simultaneously inserted into the bolt holes (120) on two adjacent side plates (110) which are positioned on the adjacent fixing frames (100); the side plate plug connector (111) is arranged at least on the front part and the rear part of the outer side surface of the side plate (110).

24. A utility rack as defined in claim 18, wherein: the outer side surface of the side plate (110) is provided with uniformly distributed supporting feet (140).

25. A utility rack as defined in claim 18, wherein: the fixing frame (100) comprises four connecting rods which are connected end to form a rectangular structure, wherein the connecting rods on the left side and the right side are connected with the side plates (110), or the connecting rods on the left side and the right side extend upwards to form the side plates (110), and the connecting rods which are transversely arranged are called as cross rods.

26. A utility rack as defined in claim 25, wherein: the cross bars at least comprise a first cross bar (321), a second cross bar (222), a fourth cross bar (112) and a fifth cross bar (113); the lower cushion supporting pieces (320) which are oppositely arranged left and right are fixedly connected through the first cross rod (321), the leg rest board connecting pieces B (220) which are oppositely arranged left and right are fixedly connected through the second cross rod (222), the front parts of the side plates (110) which are oppositely arranged left and right are fixedly connected through the fourth cross rod (112), and the rear parts of the side plates (110) which are oppositely arranged left and right are fixedly connected through the fifth cross rod (113).

27. A utility rack as defined in claim 26, wherein: be equipped with a drive assembly (2000) in mount (100), drive assembly (2000) include driving motor (2100), drive base (2200), drive guide rail (2300) and drive shaft (2400), and driving motor (2100) links to each other with drive base (2200), and the one end of drive base (2200) and the one end fixed connection of drive guide rail (2300), the other end of drive base (2200) and be located fifth horizontal pole (113) at mount (100) rear articulated, the one end of drive shaft (2400) inserts and slide cup joint in drive guide rail (2300) from the other end of drive guide rail (2300), and the other end of drive shaft (2400) is articulated with second horizontal pole (222).

28. A utility rack as defined in claim 27, wherein: an auxiliary spring B (1000) is connected between the rear part of the upper cushion support member (310) and the fifth cross bar (113), and a plurality of connecting holes (311) which are sequentially arranged from front to back and are used for connecting one end of the auxiliary spring B (1000) are arranged at the rear part of the upper cushion support member (310).

29. A seat, characterized in that: comprising a functional rack according to any one of claims 1-28, wherein a leg rest is mounted on two leg rest assemblies (200) arranged opposite to each other, and a footrest is placed on the foot rest (270); the seat cushion is arranged on the two seat cushion supporting components (300) which are oppositely arranged left and right, and the upper ends of the two backrest components (400) which are oppositely arranged left and right are provided with backrests; armrests (900) are inserted on the two side plates (110) which are oppositely arranged at the left and the right.