JP2010221973A - Rotary seat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent the occurrence of the floating and wobbling of a seat while smoothly guiding the rotation of the seat. <P>SOLUTION: The seat frame 3 of a seat body 4 is rotatably provided at a seat foot base 10 via a rotary shaft 25. A lower plate 21 and an upper plate 22 are provided on the seat foot base 10 and the seat frame 3, respectively, while holding parts 21a, 22a around the rotation center (c) are provided. By making both the holding parts 21a, 22a engaged with each other, the seat foot base 10 and the seat frame 3 are held together during the rotation of the seat frame 3 with the seat body 4 in a state of being ready for seating. In addition, a maximum distance from the rotation center (c) to the mutually engaged portion of both the holding parts 21a, 22a, is made longer than the minimum distance from the rotation center (c) to the front end and to the rear end of an opposed part where the seat foot base 10 and seat frame 3 are held opposing each other, while both the holding parts 21a, 22a, are engaged with each other while being located only inside the front end and rear end of the opposed part with at least the seat in the state of being ready for seating. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a rotating seat used for railway vehicles, buses, ships, and the like.

  In general, as a seat used for railway cars, buses, ships, etc., the part where a person sits, that is, the seat part on which the waist is seated and the back part that contacts the back can be rotated in the horizontal direction. There is something.

  The reason why the seat can be rotated in this way is, for example, to cope with the case where the user wants to sit in a state where the seats juxtaposed in front and rear face each other, or particularly in the case of a railway vehicle, along the traveling direction. This is also because there are many requests to sit forward.

  In addition, for example, the rotation may be reversed manually by a single leg as appropriate, or may be automatically reversed all at once by remote operation.

  For example, as shown in FIG. 7, the rotating seat has a structure in which a rectangular seat frame 3 that supports the seat surface portion 1 and the backrest portion 2 has a rotating unit with respect to a rectangular seat leg base 10 fixed to the floor F. 50 is rotatably supported in the horizontal direction.

  The rotation unit 50 is located at a substantially central portion in the horizontal direction of the seat frame 3 and the seat base 10 and is attached to the circular lower plate 51 and the seat frame 3 attached to the seat base 10, as shown in FIG. A circular upper plate 52 is provided, and grooves 52a and 51a having arc-shaped cross sections are formed along the circumferential direction on opposing surfaces between the lower plate 51 and the upper plate 52, respectively.

  A large number of steel spheres 53 are accommodated in the space between the grooves 52a and 51a, and the spheres 53 function as rolling elements of the bearing, so that the lower plate 51 and the upper plate 52 can be relatively rotated in the horizontal direction. It is. Further, the rotation can be locked in a predetermined direction by the lock mechanism 30 and the stopper 40.

The upper plate 52 is held by an arc-shaped presser plate 54 provided on the lower plate 51. That is, the upper plate 52 is held so as not to be separated from the lower plate 51, and the floating of the upper plate 52 is prevented.
For this reason, it also has a function of preventing the seat frame 3 from partially or entirely floating with respect to the seat base 10 during the rotation operation of the rotating seat and after the rotation lock (see, for example, Patent Document 1).

  7 and 8, the lower plate 51 is an annular outer ring, and the upper plate 52 is an annular inner ring having a slightly smaller diameter than the lower plate 51. The inner ring and the outer ring are arranged on the outer circumferential surface of the inner ring. The bearing grooves 51a and 52a are respectively formed. The lower surface of the upper plate 52 and the upper surface of the lower plate 51 are opposed to each other in the vertical direction, and the grooves 51a and 52a are formed on the opposing surfaces. A rotating unit 50 having another configuration may be employed.

  In addition, as shown in FIG. 9, a pair of receivers 5 and 6 may be provided at the four corners of the seat frame 3 and the seat base 10 around the rotation unit 50, respectively.

  Of the pair of receivers 5 and 6, the lower receiver 5 attached to the seat base 10 side has a U-shaped cross section, and the upper receiver 6 attached to the seat frame 3 side has a plate shape, and the rotating seat faces forward. Alternatively, when the upper support 6 is fitted to the lower support 5 when fixed rearward, the seat frame 3 is prevented from floating or rattling in the rotation-locked state, and performs the same function as the presser plate 24. (For example, refer to Patent Document 2).

Japanese Patent Laid-Open No. 11-129795 JP 10-76873 A

  According to the rotating unit 50 shown in FIGS. 7 and 8, it is desirable that the diameters of the upper plate 52 and the lower plate 51 be as large as possible.

  This is because, when the diameters of the lower plate 51 and the upper plate 52 are large, when the lift of the seat frame 3 with respect to the seat base 10 is prevented, the action point is more determined from the rotation center c of the rotary unit 50. This is because they can be separated from each other, and it can be said that it is more effective in preventing the sheet from lifting and rattling.

  7 and 8, the grooves 51a, 52a and the steel balls 53 provided in the lower plate 51 and the upper plate 52 allow the relative rotation between the lower plate 51 and the upper plate 52 to be smoothly performed. Since it also has a guiding function, it can be said that the longer the grooves 51a and 52a are from the rotation center c of the rotating unit 50, the more smoothly the sheet can be guided.

However, the floor F occupying area in the horizontal direction of the seat frame 3 and the seat base 10 is limited, and the lower plate 51 and the upper plate 52 of the rotating unit 50 are arranged in the horizontal direction from the seat frame 3 and the seat base 10. If it protrudes greatly, it will interfere with the seated person sitting on the seat, or the seated person sitting on the front and back seats.
For this reason, there is a limit in increasing the diameters of the upper plate 52 and the lower plate 51 of the rotating unit 50.

  Further, the pair of receiving members 5 and 6 shown in FIG. 9 are only disposed at the four corners of the seat frame 3 and the seat base 10, respectively, and the effect of preventing the seat from rising and rattling is insufficient. In addition, the function of smoothly guiding the rotation of the sheet cannot be achieved.

  SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to effectively prevent sheet lifting and rattling and to smoothly guide the rotation of the sheet.

  In order to solve the above problems, the present invention provides a seat body having a seat surface portion and a backrest portion mounted on a seat frame, the seat frame being in a horizontal direction with respect to a seat base fixed to the floor. The seat base is provided with a lower plate and the seat frame is provided with an upper plate, respectively, and the upper plate and the lower plate are held in an arc shape along the circumference around the rotation center during the rotation. A rotating seat in which the seat leg base and the seat frame are held while the seat frame is rotating and the seat body is seatable by being engaged with each other. The seat frame is rotatably supported via a rotation shaft with respect to the seat base, and A maximum distance from the rotation center in the portion is larger than a minimum distance from the rotation center to the front end and the rear end of the seat leg base and the opposed portion of the seat frame, and the both holding portions are at least the seat A configuration is adopted in which the main body is seated and positioned only inside the front end and the rear end of the facing portion and engaged with each other.

In this way, the holding portion can be arranged at a position farther from the center of rotation, and at least in the seatable state of the seat body, the holding portion is placed in the space under the seat, that is, the seat frame and the seat leg stand. Can fit in the space between.
If the holding part is completely stored under the seat, the holding part will not interfere with the seated person, and if the holding part is far from the center of rotation, it will effectively lift the seat and rattle. Can be prevented.

  In the above configuration, it is effective that the both holding portions are provided separately on both sides in the width direction of the seat frame and the seat base. If both the holding portions are provided separately on both sides in the width direction, the both holding portions are accommodated in the space under the seat at least in the seatable state of the seat body even when the both holding portions are located away from the rotation center. be able to.

Further, in each of the above-described configurations, as a specific configuration of the both holding portions, for example, a configuration in which the both holding portions are opposed to each other in the radial direction around the rotation axis, or a configuration facing the vertical direction is adopted. be able to.
At this time, the both holding portions may be engaged by direct contact, and the seat base and the seat frame may be held by the engagement, or may be indirectly contacted via another member or the like. Thus, the seat base and the seat frame may be held by engagement through the other member.

In addition, as a specific configuration of the both holding portions, for example, a configuration in which the holding portion of the upper plate enters below the holding portion of the lower plate and the both holding portions face each other in the vertical direction can be adopted. .
According to this configuration, since the holding portion of the upper plate enters below the holding portion of the lower plate, it is possible to prevent the sheet from rising and rattling with a relatively simple component configuration.

  The two holding portions face each other in such a manner that the upper plate holding portion is in contact with the holding portion of the lower plate over the entire length in the circumferential direction with the seat body facing forward or rearward. If it is the structure which has, it will be more effective in preventing the floating and rattling. The contact is preferably surface contact. In the case of surface contact, when a large load is applied to the seat body, in particular, a load in a direction in which the seat body is tilted in either the front, rear, left, or right direction, both the holding portions are more securely held.

A rolling element may be provided between the upper plate and the lower plate to guide the rotation of the seat frame relative to the seat base in the circumferential direction.
If it does in this way, rotation with a lower plate and an upper plate will become smooth by the effect | action of a rolling element.

The rolling elements that guide the rotation of the seat frame with respect to the seat base in the circumferential direction are, for example, a groove along the circumference around the rotation center in the lower plate and the upper plate, and a sphere or A configuration may be considered in which rollers and the like are arranged so as not to fall off and can roll in both grooves.
In addition, you may make it exhibit the function of preventing the above-mentioned floating and rattling simultaneously by engagement of both the holding parts via the rolling element.

Further, in each of the above-described configurations, a configuration in which the lower surface of the upper plate is in contact with a contact portion provided on the seat leg base in a state where the seat main body faces frontward or rearward can be employed. .
In this way, since the loads of the seated person and the seat body are transmitted to the seat base through the upper plate and the contact portion, the rattling of the seat can be further reliably prevented.

  Further, the seat leg base is provided with a swingable locking lever, the upper plate is provided with a peripheral surface plate having a cylindrical surface around the rotation center, and the lock member is engageable with the peripheral lever. The locking lever is biased so as to swing to the side engaged with the lock portion, and the locking lever is pressed against the peripheral plate by the biasing and can slide on the cylindrical surface. In addition, it is possible to adopt a configuration in which the rotation of the seat frame in at least one direction around the rotation center is locked by engaging with the lock portion.

In general, the locking lever that locks the rotation of the rotating seat is automatically engaged with the locking portion on the seat frame side to be locked when the seat frame rotates and its orientation reaches a predetermined position. Is desired.
Since the upper plate in the above configuration is formed in an arc shape, if a lock portion is provided on the cylindrical peripheral surface plate along the circular arc, the locking lever slides smoothly on the peripheral surface plate with the rotation of the seat frame, When the lock part is reached, the lock part can be automatically engaged.
Therefore, the upper plate, which is a sheet holding mechanism, can be used as a mechanism for locking the rotation of the rotating sheet, which can contribute to a reduction in the number of parts and simplification of the structure.

  The present invention can effectively prevent the sheet from lifting and rattling, and the rotation of the sheet can be guided smoothly.

1 shows an embodiment, (a) is a plan view, (b) is a front view, and (c) is a side view. The principal part of the embodiment is shown, (a) is a plan view, (b) is a front view, and (c) is a side view. The perspective view which shows the engagement state of a lower plate and an upper plate The action of the lower plate and the upper plate is shown, (a) is a plan view showing the engaged state, (b) is a sectional view of (a), and (c) is a state in which the seat is rotated from the state of (a). Plan view showing Plan view showing rotation of seat frame with respect to seat base Explanatory drawing showing the function of the locking mechanism A conventional example is shown, (a) is a plan view, (b) is a front view, and (c) is a side view. A conventional example is shown, (a) is a plan view of a lower plate and an upper plate, (b) is a front view of (a). A conventional example is shown, (a) is an exploded perspective view, (b) is an enlarged view of the main part of (a).

  Embodiments of the present invention will be described with reference to the drawings. The rotating seat of this embodiment is a rotating seat 7 for two people used in a passenger room of a railway vehicle. A number of the rotating seats 7 are fixed to the floor F in parallel along the longitudinal direction of the vehicle.

  As shown in FIGS. 1 and 2, the rotating seat 7 is configured such that a backrest portion 2 that contacts the back of a seat surface portion 1 on which a seated person sits is placed in a front-rear direction via a reclining mechanism (not shown). It can be raised and lowered freely. Further, the backrest 2 can be fixed so as not to move at an arbitrary undulation angle.

  As shown in FIG. 1, the seat body 4 having the seat surface portion 1 and the backrest portion 2 is mounted on a seat frame 3 having a horizontal frame portion 3c having a rectangular shape in plan view. Further, the seat frame 3 is provided with a rising portion 3 d that supports the backrest portion 2.

  The seat frame 3 is supported via a rotation unit 20 so as to be rotatable in a horizontal direction with respect to a seat base 10 having a rectangular shape in plan view, which is fixed to the floor F. The rotation unit 20 includes a rotation shaft 25 having a vertical axis, a lower plate 21 fixed to the seat base 10 side, an upper plate 22 fixed to the seat frame 3 side, and the like.

  The seat leg base 10 is fixed to the floor F by leg portions 14 provided at four corners, and the two horizontal frames 12, 12 in the seat width direction are fixed between the leg portions 14, 14. , And two end frames 13 in the front-rear direction of the seat.

The upper end of the rotary shaft 25 constituting the rotary unit 20 is fixed to the seat frame 3 and can be rotated integrally with the seat frame 3. Further, the lower end of the rotating shaft 25 is rotatable with respect to the boss portion 11 provided on the seat base 10 via a known bearing mechanism. The seat frame 3 and the seat body 4 are rotatable in the horizontal direction with respect to the seat base 10 with the axis of the rotation shaft 25 as the rotation center c.
The boss portion 11 is provided on a central frame 15 that is spanned between the front and rear horizontal frames 12 and 12 and fixed.

The lower plate 21 provided on the seat base 10 includes a plate-like member having an arc shape in plan view along the circumference around the rotation center c, and the flat lower surface of the plate-like member serves as a holding portion 21a. . As shown in FIG. 4C, the entire length of the outer peripheral edge 21b of the lower plate 21 is an arc having a constant curvature with the radius from the rotation center c being “R ₁ ”. The inner peripheral edge 21c is a curve extending along the outer peripheral edge 21b, and includes a peripheral plate 36 that rises downward from the inner peripheral edge 21c, as shown in FIG. The peripheral surface plate 36 has a function of increasing the rigidity of the lower plate 21 and a function of preventing foreign matter from entering the vicinity of the holding portion 21a and biting into the movable portion. The outer peripheral surface of the peripheral surface plate 36 is a cylindrical surface having a certain curvature with the radius from the rotation center c being “R ₃ ”.

Further, the lower plate 21 has fixing portions 21d protruding downward at both ends in the circumferential direction, and the fixing portions 21d are placed on the horizontal frames 12 and 12 of the seat base 10, respectively. It is fixed with screws. Therefore, the lower plate 21 is set so as not to move with respect to the seat base 10, and the holding portion 21 a is set slightly above the upper surface of the horizontal frame 12.
Further, the lower plate 21 having the same shape and size on both sides in the width direction of the seat base 10 is provided at the same distance from the rotation center c.

The upper plate 22 provided in the seat frame 3 includes a plate-like member having an arc shape in plan view along the circumference around the rotation center c, and the flat upper surface of the plate-like member serves as a holding portion 22a. . As shown in FIG. 4C, the entire length of the inner peripheral edge 22b of the upper plate 22 is an arc having a constant curvature with the radius from the rotation center c being “R ₂ ”. Further, the outer peripheral edge 22c is a curve extending along the inner peripheral edge 22b, and includes a peripheral plate 32 that rises upward from the outer peripheral edge 22c. The peripheral surface plate 32 has a function to increase the rigidity of the upper plate 22 and a function to prevent foreign matter from entering and biting into the movable part in the vicinity of the holding part 22a, and the rotational operation of the seat frame 3 and the seat body 4 It is also used to provide a lock mechanism 30 that locks at a predetermined position.

The upper plate 22 has a peripheral surface plate 32 fixed to the seat frame 3 by welding at both ends in the circumferential direction. For this reason, the upper plate 22 does not move with respect to the seat frame 3. The upper plate 22 has the same shape and size on both sides in the width direction of the seat frame 3. The inner peripheral surface of the peripheral surface plate 32 is a cylindrical surface having a constant curvature with the radius from the rotation center c being “R ₄ ”, and the outer peripheral surface of the peripheral surface plate 32 has a radius from the rotation center c. The cylindrical surface has a constant curvature of “R ₅ ”.

The center of rotation c of the seat leg base 10 and the seat frame 3 is located substantially at the center between the front end 10a and the rear end 10b of the seat leg base 10, as shown in FIG. Further, the rotation center c is located at the center between the front end 3a and the rear end 3b in the horizontal frame portion 3c of the seat frame 3 that faces the seat base 10.
The distance in the front-rear direction between the front end 10a and the rear end 10b of the seat leg base 10 is “L ₁ ”, and the front frame 3a and the rear end 3b in the horizontal frame portion 3c of the seat frame 3 facing the seat leg base 10 are arranged. The distance in the front-rear direction (the distance in the front-rear direction viewed from the seated person in the seatable state) is “L ₂ ”.

Here, the outer peripheral edge 21 b of the holding portion 21 a of the lower plate 21 has a diameter (twice the radius “R ₁ ”) that is the “opposing portion between the seat leg base 10 and the seat frame 3. Is set larger than the length “L” in the front-rear direction.

As shown in FIG. 2C, the “opposite portion” refers to the front end 3 a and the seat leg base 10 in the horizontal frame portion 3 c of the seat frame 3 facing the seat leg base 10 as shown in FIG. The position of the front end 10a that protrudes further forward and the rear end 3b of the horizontal frame portion 3c of the seat frame 3 facing the seat leg base 10 and the rear end 10b of the seat leg base 10 are more rearward. It is defined between the protruding position.
That is, if the entire lower plate 21 and the upper plate 22 are accommodated in the “opposite portion” so as not to protrude from the “opposing portion” in the seatable state, the lower plate 21 and the upper plate 21 and It is considered that the plate 22 is defined within a range that does not fall into the sight of the seated person and does not impair the aesthetics, and that the lower plate 21 and the upper plate 22 do not interfere with the seated person's feet.

In this embodiment, the front end 3a of the horizontal frame portion 3c of the seat frame 3 projects forward from the front end 10a of the seat leg base 10, and the rear end 3b of the horizontal frame portion 3c of the seat frame 3 is the seat leg base. 10 protrudes rearward from the rear end 10b.
Therefore, the length “L” in the front-rear direction of the “opposite portion” matches the length of the front-rear direction range occupied by the horizontal frame portion 3 c of the seat frame 3, and the front-rear direction distance “L ₂ ” of the horizontal frame portion 3 c. May be the length “L” in the front-rear direction of the “opposing portion”.
_Therefore, it is _{R 1> L / 2 = L} 2/2.

As for the similarly the relationship between the diameter of the inner peripheral edge 22b of the holding portion 22a of the upper plate 22 (twice the length of the radius _{"R 2"), R 2> L / 2} = L 2/2 Is established.
Note that “L / 2” corresponds to the minimum distance from the rotation center c to the front end and the rear end of the “opposed portion” of the seat leg base 10 and the seat frame 3.

  Further, since R1> R3 and R4> R1, the lower plate 21 and the upper plate 22 do not come into contact with the facing peripheral plates 32 and 36, respectively. That is, the outer peripheral edge 21b of the lower plate 21 and the inner peripheral edge 22b of the upper plate 22 are set so as not to slide on the inner peripheral surface 32b of the peripheral surface plate 32 and the outer peripheral surface 36b of the peripheral surface plate 36, respectively.

Further, the radius _{"R 5"} of the outer peripheral surface of a outermost diameter portion of the upper plate 22 peripheral surface plate _32, because it is _{R 5> L / 2 = L} 2/2, the lower plate 21 and upper plate 22 When the seat body is in the use state, the seat body is positioned within the range indicated by the length L in the front-rear direction, that is, on the inner side of the outer edges of the frames 12, 12, and so on. It is stored in a position where it does not hit (see the state shown in FIG. 1).

  Further, a lock portion 33 of the lock mechanism 30 is provided on the peripheral surface plate 32 of the upper plate 22. The lock mechanism 30 includes a tapered surface 33a that gradually moves away from the center of rotation c along the circumferential direction, and an end surface 33b that is formed radially inward at a terminal portion of the tapered surface 33a. As shown in FIG. 5, the lock portions 33 are respectively provided on the upper plates 22 on both sides, and the direction of the taper is set in the opposite direction along the circumferential direction around the rotation center c.

A locking lever 31 that can swing in the vertical direction is provided at one end in the width direction of the seat base 10. The locking lever 31 is usually provided on the vehicle passage side, and is fixed to the end frame 13 via a bracket so that the engaging portion 31a at the tip thereof swings to the side that engages with the lock portion 33. It is biased by an elastic member 34 (not shown).
The engaging portion 31 a includes a rubber roller 31 c that is rotatable in the horizontal direction. The roller 31 c is pressed against the peripheral plate 32 by the biasing force, and the outer periphery of the peripheral plate 32 is rotated with the rotation of the upper plate 22. It can move while sliding or rolling on the surface 32a and the tapered surface 33a.

  The operation of the rotating seat will be described below. As shown in FIG. 1, the seat body 4 is in a seatable state. The seatable state indicates a state in which the seat base 10 and the seat frame 3 are fixed to the seat body 4 in a direction in which a person can sit. In this embodiment, it refers to the front direction along the traveling direction of the vehicle or the rear direction reversed 180 degrees from the front direction.

In the seatable state, as shown in FIGS. 2 and 3A, the engaging portion 31 a of the locking lever 31 is in contact with the end surface 33 b of the lock portion 33, and the upper plate 22 is thereby contacted. The rotation in the direction of arrow A shown in FIG. Further, stoppers 40, 40 are provided at two positions on the opposite end in the width direction of the seat base 10, and one of the stoppers 40 is a frame-side stopper 41 (see FIG. 5), the rotation in the direction of arrow B in the figure is also restricted.
For this reason, the rotation of the seat frame 3 is regulated in both directions.

Further, as shown in FIGS. 3B and 4B, the holding portion 21a of the lower plate 21 and the holding portion 22a of the upper plate 22 are maintained in a state in which their surface directions are always parallel to each other. The holding parts 21a and 22a are opposed to each other in a contact state.
By this contact, the seat base 10 and the seat frame 3 are held in a seatable state, and the seat frame 3 is lifted and rattled against forces in each direction acting on the seat frame 3 from the seat body 4. Sticking is prevented. In addition, since both the holding portions 21a and 22a are in surface and continuous contact over the entire length in the circumferential direction, the seat leg base 10 and the seat frame 3 are firmly held. ing.

  The operating portion 31 b of the locking lever 31 is stepped on with a foot, and the engaging portion 31 a is swung in a direction away from the peripheral plate 32. As shown by a chain line in FIG. 4C, the engaging portion 31a moves to the outside of the lock portion 33, and the seat frame 3 becomes rotatable.

The seat body 4 is pushed by hand, and the seat frame 3, the seat body 4 and the like are rotated around the rotation center c with respect to the seat base 10 as shown by an arrow C in FIG. The operation unit 31b may continue to be stepped on, but after slightly rotating, the foot to be stepped on may be removed.
When the foot for stepping on the operating portion 31b is removed, the roller 31c of the engaging portion 31a is pressed against the tapered surface 33a and the outer peripheral surface of the peripheral plate 32 by the urging force, and the upper plate 22 is slid or rolled while the roller 31c slides. It rotates.

  As the upper plate 22 rotates, the circumferential length of the portion where the holding portions 21a and 22a are engaged gradually decreases. However, the holding portions 21a and 22a are still planar. And since the state which contact | abutted continuously is maintained, the rattling prevention of the seat frame 3, the seat main body 4, etc. is maintained.

  When the rotation is further continued, the holding portions 22a and 22a of the left and right upper plates 22 and 22 are disengaged from the holding portions 21a and 21a of the lower plates 21 and 21, respectively, and a part thereof is on the opposite side. The lower plates 21 and 21 reach the positions facing the holding portions 21a and 21a. Then, the holding portions 22a and 22a of the upper plates 22 and 22 are brought into contact with the holding portions 21a and 21a of the lower plates 21 and 21 on the opposite side, respectively, and are brought into the engaged state again by the contact. By this engagement, the seat frame 3 and the seat body 4 do not rattle, and the state of being firmly held is maintained.

  Thereafter, when the upper plate 22 continues to rotate, the circumferential length of the portion where both the holding portions 21a and 22a are engaged gradually increases. Even in this state, since both the holding portions 21a and 22a are still in a state where they are continuously and continuously in contact with each other, prevention of rattling of the seat frame 3 and the seat body 4 is maintained. .

  Eventually, the roller 31c of the engaging portion 31a reaches the lock portion 33, and the upper plate 22 rotates while the roller 31c slides or rolls on the outer peripheral surface of the tapered surface 33a and the peripheral surface plate 32.

  When the seat body 4 is rotated 180 degrees from the initial position so that a person can take a seat, the engaging portion 31a of the locking lever 31 advances while sliding on the tapered surface 33a of the locking portion 33, and the elastic member 42 Due to the urging force, it falls to the inner peripheral side along the end surface 33b and comes into contact with the outer peripheral surface 32a (see, for example, FIGS. 6A to 6C).

In this state, another stopper 40 provided at the end of the seat base 10 abuts on another frame-side stopper 41 provided on the seat frame 3, and by this contact, the further upper plate 22 is further aforesaid. The rotation in the direction of arrow C is restricted. Further, the engaging portion 31 a of the locking lever 31 contacts the end surface 33 b of the lock portion 33, and the rotation of the upper plate 22 in the reverse direction is restricted by the contact.
Since the stopper 40 is provided with an elastic member (not shown), the impact when the stopper 40 comes into contact with the frame side stopper 41 is reduced.

  The operation for returning the orientation of the sheet main body 4 to the original direction may be performed by setting the rotation direction of the sheet main body 4 to the reverse direction in the above-described procedure, and thus the description thereof is omitted.

  In this embodiment, the outer peripheral edge 21b in the holding part 21a of the lower plate 21 and the inner peripheral edge 22b in the holding part 22a of the upper plate 22 are respectively arcs around the rotation center c, and the entire length of the arc is constant curvature. The outer peripheral edge 21b and the inner peripheral edge 22b are prevented from sliding on the inner peripheral surfaces 32b and 36b of the facing peripheral plates 32 and 36. However, as another embodiment, the outer peripheral edge 21b and the inner peripheral edge 22b are not slid. A function of guiding the relative rotation of the lower plate 21 and the upper plate 22 in the circumferential direction by sliding the entire length or a part of the peripheral edge 22b on the inner peripheral surfaces 32b, 36b of the facing peripheral plates 32, 36, respectively. May be given.

  Further, for example, as shown in FIG. 7A, a rolling element such as a sphere or a roller is disposed between the opposing surfaces of the lower plate 21 and the upper plate 22, and the rolling element is connected to the lower plate 21 and the upper plate 22. A method of smoothing the relative rotation between the lower plate 21 and the upper plate 22 by contacting the plate 22 while rotating is also conceivable. Furthermore, it is good also as a structure which accommodates the rolling element in the groove | channel formed along the periphery around the said rotation center. The rolling element may be rotatably fixed to the lower plate 21 or the upper plate 22 via a support shaft, or may be supported so as not to fall off by being fitted into a groove or a recess.

  Moreover, the structure which made the direction of the lower plate 21 and the upper plate 22 into the reverse direction inside and outside is also employable. That is, in the above embodiment, the outer peripheral edge 21b of the lower plate 21 protrudes in the outer peripheral direction, and the inner peripheral edge 22b of the upper plate 22 protrudes in the inner peripheral direction. The peripheral surface plate 36 of the upper plate 22 is raised from the outer peripheral edge 21b so that the inner peripheral edge 21c of the lower plate 21 protrudes in the inner peripheral direction, and the peripheral surface plate 32 of the upper plate 22 is raised from the inner peripheral edge 22b. In this configuration, the outer peripheral edge 22c protrudes in the outer peripheral direction.

Furthermore, in the said embodiment, although each circular arc which the said outer periphery 21b in the holding part 21a of the lower plate 21 and the said inner periphery 22b in the holding part 22a of the upper plate 22 made constant curvature over the full length, As long as the rotation of the seat frame 3 is not hindered, one or both of the outer peripheral edge 21b and the inner peripheral edge 22b may not have a constant curvature.
When the two holding portions 21a and 22a are engaged by direct contact with each other, it is desirable that the holding portions 21a and 22a are surface contact that is continuous in the circumferential direction around the rotation center c, but in the circumferential direction. It is also possible to adopt a configuration in which the surface contact is intermittent, or the line contact in the circumferential direction is continuous or intermittent.

DESCRIPTION OF SYMBOLS 1 Seat surface part 2 Backrest part 3 Seat frame 3c Horizontal frame part 3d Rising part 4 Seat main body 5,6 Receptacle 7 Rotating seat 10 Seat base 11 Boss part 12 Horizontal frame 13 End frame 14 Leg part 20 Rotating unit 21 Lower plate 22 Upper plate 21a, 22a Holding part 21b, 22b Perimeter 23 Electric heater 24 Presser plate 25 Rotating shaft 26 Contact part 30 Lock mechanism 31 Locking lever 31a Engagement part 31b Operation part 32, 36 Peripheral plate 32a Outer peripheral surface 32b Inner circumference Surface 33 Lock portion 33a Tapered surface 33b End surface 34 Elastic member 40 Stopper 41 Frame side stopper 42 Elastic member c Center of rotation F Floor

Claims (8)

A seat body 4 having a seat surface portion 1 and a backrest portion 2 is mounted on a seat frame 3, and the seat frame 3 is freely rotatable in a horizontal direction with respect to a seat leg base 10 fixed to the floor F. A lower plate 21 is provided on the seat base 10 and an upper plate 22 is provided on the seat frame 3. The upper plate 22 and the lower plate 21 each have an arc shape along the circumference around the rotation center c during the rotation. Holding portions 21a and 22a are provided, respectively, and the holding portions 21a and 22a are engaged with each other so that the seat leg base 10 and the seat leg base 10 can be seated while the seat frame 3 is rotating and the seat body 4 is seatable. In the rotating seat in which the seat frame 3 is held,
The seat frame 3 is rotatably supported with respect to the seat base 10 via a rotary shaft 25, and the maximum distance from the rotation center c at the engaging portion between the holding portions 21a and 22a is determined as follows. It is larger than the minimum distance from the rotation center c to the front end and the rear end of the facing portions of the seat leg 10 and the seat frame 3, and the holding portions 21a and 22a are at least seatable in the seat body 4. The rotating sheet is characterized in that it is located only inside the front end and the rear end of the facing portion and is engaged with each other.   The rotating seat according to claim 1, wherein the two holding portions (21a, 22a) are provided separately on both sides in the width direction of the seat frame (3) and the seat base (10).   The holding portion 22a of the upper plate 22 enters below the holding portion 21a of the lower plate 21, and the both holding portions 21a, 22a engage with each other in a vertically opposed state. 2. A rotating sheet according to 2.   In the seatable state of the seat main body 4, the holding portion 22a of the upper plate 22 is engaged with the holding portion 21a of the lower plate 21 by abutting the entire length in the circumferential direction. The rotating sheet according to claim 3.   The rotating sheet according to claim 4, wherein the contact is a surface contact.   The rolling element which guides rotation with respect to the lower plate 21 of the said upper plate 22 to the circumferential direction between the said upper plate 22 and the lower plate 21 is provided. Rotating sheet.   The lower surface of the upper plate (22) is in contact with a contact portion (26) provided on the seat leg base (10) in a seatable state of the seat body (4). Rotating sheet.   The seat leg base 10 is provided with a swingable locking lever 31, the upper plate 22 is provided with a peripheral surface plate 32 having a cylindrical surface around the rotation center c, and the peripheral lever plate 32 is engaged with the locking lever 31. A lock portion 33 that can be engaged is provided, and the locking lever 31 is biased so as to swing to a side that engages with the lock portion 33, and the locking lever 31 is applied to the peripheral surface plate 32 by the biasing. The rotation of the seat frame (3) in at least one direction around the rotation center (c) is locked by being pressed and slidable on the cylindrical surface and engaging the lock portion (33). The rotating sheet according to any one of 1 to 7.

Images