JP2021176807A - Lift for vehicle maintenance - Google Patents

Abstract

To make a vehicle receiving platform slightly high or flat and robust, so that a vehicle can be safely lifted up for maintenance and inspection in response to the low height of a tested vehicle and the low position of a jack-up point, and to enable the platform to be easily manufactured.SOLUTION: A lift for vehicle maintenance includes a vehicle receiving platform 9 attached to an upper end of an elevator pillar and housed in a pit in a movable manner. A support arm moving space 19 and a cylinder installation space 20 are vertically arranged in the interior of the vehicle receiving platform 9. A support arm 18 is movably arranged in the support arm moving space 19. A pair of fluid pressure cylinders are arranged and connected to the support arm 18 by connecting pins 32, 33 in the cylinder installation space 20.SELECTED DRAWING: Figure 10

Description

The present invention is suitable for, for example, a maintenance lift for a large automobile, and the vehicle cradle is made small or flat and robust, and the height of the vehicle under test can be lowered and the jack-up point can be lowered. The present invention relates to a vehicle maintenance lift that enables the vehicle to be safely lifted up and maintained and inspected, and can be easily manufactured.

For example, when servicing and inspecting large vehicles such as buses and trucks, a pit is provided on the work floor, a ram is provided in this pit so that the ram can be raised and lowered via a cylinder, and an erection frame that is a vehicle cradle is provided at the upper end of the ram. A box-shaped attachment pedestal is attached to the erection frame, a pair of support frames that are attachments are movably arranged on the attachment pedestal, and a loading portion of the vehicle to be inspected is placed on the upper end of the support frame to be inspected. A vehicle maintenance lift for lifting a vehicle from a work floor is used (see, for example, Patent Document 1).

However, the support frame is generally heavy, and its position adjustment is troublesome and complicated. In particular, when the position of the support frame is readjusted after the vehicle to be inspected is brought in, an operator slips under the vehicle to be inspected. Since the work is carried out, the work is extremely complicated, and improvement thereof has been desired.

In response to such a request, a pit is provided on the work floor surface, and one or more elevating mechanisms equipped with an elevating support and a vehicle cradle are provided in this pit, and one of them is arranged at a fixed position in the pit. The other elevating mechanism is provided so as to be movable, a substrate is arranged at the upper end of the elevating mechanism, guides having a U-shaped cross section are arranged on the substrate so as to face each other, and a pair of sliders are slidably provided on the guides. A box-shaped vehicle cradle is fixed to the outside of each slider, and an attachment mounting portion for attaching / detaching an attachment is provided on the outside of the vehicle cradle, while a pair of cylinder cases are arranged symmetrically with each other between the sliders. There is an embedded lift for vehicle maintenance in which the piston rod is pivotally attached to the corresponding cylinder case, the piston rod is expanded and contracted, and the slider is moved to remotely adjust the position of the attachment (for example, patent). Reference 2).

However, in this embedded lift for vehicle maintenance, a cylinder case is arranged directly above the slider, a box-shaped vehicle cradle is fixed to the outside of the slider, and an attachment mounting portion is provided to the outside of the vehicle cradle. Therefore, the height from the board to the attachment becomes high, and when not in use, the attachment mounting part approaches the work floor surface, and there is a risk that the vehicle cradle will come into contact with the lower part of the vehicle to be inspected before escaping from the pit. rice field.
Therefore, it becomes difficult to adjust the distance between the pair of sliders due to the recent lowering of the vehicle height of the vehicle under test and the lowering of the support position when the vehicle is jacked up. There was a problem that it was difficult to support the vehicle under test at the position and it was not possible to ensure work safety.

Moreover, since the buried lift for vehicle maintenance has the bottom plate on which the vehicle cradle is installed slidably arranged on the guide, the structural strength is generally weak and sufficient for the bending moment associated with the support of the vehicle under test. There was a problem that I couldn't stand it.
In addition, if the pair of attachments are placed apart from each other according to the loading position of the vehicle to be inspected, the cylinder case will be exposed between the pair of sliders, and the cleaning water on the work floor will be splashed on the cylinder. There was a problem that the case was rusted, its function was deteriorated, and it was easy to break down.

Jitsukaisho 63-139294 Utility Model Registration No. 2507116

The present invention solves such a problem, and is suitable for maintenance lifts for large automobiles, for example. It is an object of the present invention to provide a vehicle maintenance lift that can be safely lifted up and maintained and inspected in response to a lower position, and that can be easily manufactured.

The invention of claim 1 has a vehicle cradle attached to the upper end of an elevating column and housed so as to be able to appear and disappear in the pit, and the vehicle cradle is a pair of fluid pressure cylinders arranged symmetrically inside. In a vehicle maintenance lift provided with a pair of support arms provided so as to be operable in different directions through the operation of the pair of fluid pressure cylinders, a support arm moving space and a cylinder are provided inside the vehicle cradle. The installation space is arranged vertically, the support arm is movably arranged in the upper support arm moving space, the pair of fluid pressure cylinders are arranged directly under the support arm moving space, and the support is supported in these spaces. By arranging the arm and fluid pressure cylinder reasonably and compactly, the vehicle cradle can be flattened and made smaller or more compact, and it is possible to respond to the recent lowering of the vehicle height and the position of the jack-up point. At the same time, the structure is simplified.

According to the second aspect of the present invention, a erection plate is arranged and closed over the entire upper portion of the vehicle cradle on the opening side, the cross section of the vehicle cradle is formed into a hollow substantially box shape, and the section coefficient of the vehicle cradle is defined. It is made large and robust, supports the support arm firmly, corresponds to the bending moment applied to the support arm when supporting the vehicle under test, and allows the vehicle to be safely lifted up for maintenance and inspection. The erection plate protects the inside of the vehicle cradle, prevents the ingress of water such as washing water, and prevents the occurrence of rust and functional deterioration of the internal components.
According to the third aspect of the present invention, notches are formed at both ends of the erection plate, and an attachment mounting portion provided at the tip of the support arm is engagedably accommodated in the notches, and the support arm has a simple structure. The space occupied during contraction is made compact and the mechanism is simplified.

According to the fourth aspect of the present invention, the semicircular peripheral surfaces of both side portions of the support arm are slidably arranged inside both side portions of the vehicle cradle so that the support arm can move smoothly and stably. I have to.
According to the fifth aspect of the present invention, a cylinder base for installing the pair of fluid pressure cylinders and a base sheet for supporting the cylinder base are superposed and arranged in the cylinder installation space, and the cylinder base and the base sheet correspond to each other. A notch groove is formed at a position, the pair of fluid pressure cylinders are arranged so as to face these notch grooves, the pair of fluid pressure cylinders are arranged reasonably separated from each other, and a conduit connected to the fluid pressure cylinder is provided. Along the notch groove, it is possible to pipe in an orderly and compact manner.

According to the sixth aspect of the present invention, the connection end of the conduit communicating with the fluid pressure device of the pair of fluid pressure cylinders is arranged so as to project downward from the outside of the vehicle cradle, and is connected to the conduit to be piped in the elevating column. Is easy and easy to work with.
In the invention of claim 7, a connecting portion and a stopper are projected downward from the bottom of the support arm, the tip portions of the piston rods of the pair of fluid pressure cylinders are connected to the connecting portion, and the stopper is attached to the vehicle cradle. It is arranged so that it can come into contact with the engaging protrusions provided in the above, and the movement range of the support arm is regulated to realize stable movement and safe operation of the support arm.
According to the eighth aspect of the present invention, the position of the attachment mounting portion provided at the tip end portion of the support arm is adjusted by individually expanding and contracting the pair of fluid pressure cylinders.

According to the first aspect of the present invention, the support arm moving space and the cylinder installation space are arranged vertically inside the vehicle cradle, and the support arm is movably arranged in the upper support arm moving space. Since a pair of fluid pressure cylinders were placed directly underneath, the support arm and fluid pressure cylinders were placed reasonably and compactly in these spaces to flatten the vehicle cradle and make it smaller or more compact. It is possible to cope with the lowering of the vehicle height and the lowering of the jack-up point, and the structure can be simplified.

In the invention of claim 2, since the erection plate is arranged and closed in the entire upper part of the opening side of the vehicle cradle and the cross section of the vehicle cradle is formed into a hollow substantially box shape, the cross-sectional coefficient of the vehicle cradle can be determined. It is made large and robust, supports the support arm firmly, and corresponds to the bending moment applied to the support arm when supporting the vehicle under test, so that the vehicle can be safely lifted up for maintenance and inspection. The erection plate protects the inside of the vehicle cradle, prevents the ingress of water such as washing water, and prevents the occurrence of rust and functional deterioration of the internal constituent members.
According to the third aspect of the present invention, notches are formed at both ends of the erection plate, and the attachment mounting portion provided at the tip of the support arm is engagedably accommodated in the notches, so that the support arm is occupied when the support arm is contracted. The space can be made compact and the mechanism can be simplified.

In the invention of claim 4, since the semicircular peripheral surfaces of both side portions of the support arm are slidably arranged inside both side portions of the vehicle cradle, the support arm can be moved smoothly and stably. ..
In the invention of claim 5, a cylinder base for installing a pair of fluid pressure cylinders and a base sheet for supporting the cylinder base are superposed and arranged in a cylinder installation space, and notches are provided at corresponding positions of the cylinder base and the base sheet. Since the grooves were formed and the pair of fluid pressure cylinders were arranged so as to face these notch grooves, the pair of fluid pressure cylinders were arranged reasonably separated from each other, and the conduit connected to the fluid pressure cylinders was provided in the notch groove. Along the way, it can be neatly and compactly piped.

In the invention of claim 6, since the connecting end of the conduit communicating with the fluid pressure device of the fluid pressure cylinder is arranged so as to project downward from the outside of the vehicle cradle, it is easy to connect to the conduit to be piped in the elevating column. Workability can be improved.
In the invention of claim 7, a connecting portion and a stopper are projected downward from the bottom of the support arm, the tip of the piston rod of the fluid pressure cylinder is connected to the connecting portion, and the stopper is provided on the vehicle cradle. Since the support arm is arranged so as to be in contact with the joint protrusion, the movement range of the support arm can be regulated, and stable movement and safe operation of the support arm can be realized.

It is a front view which shows the situation at the time of the lift-up of the mobile lift applied to this invention. It is a top view which shows the situation at the time of the lift down of a fixed lift and a mobile lift applied to this invention in an enlarged manner. It is a front view which shows the situation at the time of the lift down of the mobile lift applied to this invention. It is a right side view of FIG. In the enlarged plan view showing the cylinder base arranged in the lower inside of the vehicle cradle applied to the present invention, a pair of fluid pressure cylinders are symmetrically arranged outside the notch groove.

It is a front view of FIG. It is a front view which shows the situation which the pair of fluid pressure cylinders were assembled with the vehicle cradle applied to this invention. It is a right side view of FIG. It is an enlarged plan view which shows one of the vehicle cradle applied to this invention and the support arm attached to this. It is a front view which shows the fluid pressure cylinder assembled to the vehicle cradle applied to this invention, and the support arm in an enlarged manner.

It is a right side view of FIG. The plan view of the vehicle cradle applied to the present invention shows the protruding state of the left and right support arms.

Hereinafter, an illustrated embodiment in which the present invention is applied to a maintenance lift for a large automobile will be described. In FIGS. 1 to 12, 1 is a work floor surface of an automobile maintenance factory, and the floor surface 1 is covered with a long pit 2. It is provided along the approach direction of the inspection vehicle.
A fixed lift 3 and a moving lift 4 are provided inside the pit 2, and these lifts 3 and 4 can be expanded and contracted with a lifting mechanism controlled by a fluid pressure device 5a and, in the embodiment, a hydraulic device 5a. It is provided with square tubular elevating columns 6 and 7, and vehicle pedestals 8 and 9 are arranged at the upper ends of the columns 6 and 7.
In the figure, reference numeral 10 denotes a pit cover in which the opening of the pit 2 can be opened and closed, and is arranged at substantially the same height as the work floor surface 1.

The vehicle cradle 8 and 9 are configured to be substantially the same, and for convenience, the vehicle cradle 9 on the mobile lift 4 side will be described.
The vehicle cradle 9 is formed in a horizontally long hollow robust substantially box shape, which is formed on a horizontally long rectangular thick substrate 11 having an insertion hole (not shown) for an oil conduit which is a conduit, and on the substrate 11. A horizontally elongated rectangular table plate 12 having a wall thickness welded by polymerization, side plates 13 and 13 having a wall thickness welded and arranged to face each other on both sides of the table plate 12, and the upper end portions of the side plates 13 and 13. It is composed of a wall-thick erection plate 14 welded to the surface and a pair of wall-thickness guides 15 and 15 welded on both sides of the table plate 12 and inside the side plates 13 and 13.
In the figure, reference numerals 16 and 17 are rectangular cutouts formed at both ends of the erection plate 14 in the length direction, and attachment mounting portions described later are accommodated in the cutouts 16 and 17 so as to be engaged with each other.

The cross section of the vehicle cradle 9 is formed in a horizontally long rectangular box shape as shown in FIGS. 8 and 11, and the hollow space inside the vehicle cradle 9 is substantially equally divided vertically at the positions of the guide surfaces 15a and 15a of the guides 15 and 15. A support arm moving space 19 of the support arm 18 is formed above the support arm moving space 19, and a concave cylinder installation space 20 narrower than the moving space 19 is formed below the support arm moving space 19.
In this case, the cross section of the vehicle cradle 9 can be formed in a substantially U shape with an opening above by omitting the erection plate 14 instead of the box shape.

The moving space 19 is formed in a horizontally long rectangular shape partitioned by the side plates 13 and 13, the inner surface of the erection plate 14, the upper end of the side plate 13, and the guide surface 15a, and the left and right support arms are formed in the moving space 19. 18 is slidably arranged.
The support arms 18 and 18 are arranged so that their inner ends can be brought into contact with each other, and the movement positions inside them are regulated so that the span of the loading position of the vehicle can be formed to the minimum by the left and right attachments described later. ..

That is, the stopper pins 54, which are stoppers, are projected downward at the outer positions of the connecting pins, which are the connecting portions, which will be described later, on the bottom surfaces of the support arms 18 and 18, and the stopper pins 54 are the both ends of the cylinder base, which will be described later. It is arranged so as to be able to come into contact with the stoppers 55 and 55, which are engaging protrusions protruding from the cylinder.
The stoppers 55 and 55 make it possible to regulate the outer movement positions of the support arms 18 and 18, and make it possible to form the maximum load position span of the vehicle by the left and right attachments described later.

The cylinder installation space 20 is located directly below the support arm moving space 19, is partitioned by the inner surfaces of the table plates 12, 12 and the guides 15, 15 and their heights, and is horizontally long, narrower than the moving space 19. It is formed in a rectangular shape, the inner surface of the substrate 11 is arranged on the lower surface thereof, and a cylinder base in which a cylinder described later is installed is arranged in the space 20.

The support arm 18 is formed by superimposing a plurality of horizontally long rectangular plates, and the width of the rectangular plates is formed to be slightly narrower than the facing distance of the side plates 13 and 13, and the rectangular plate arranged in the intermediate portion thereof. Is formed narrower as shown in FIG. 11, and a round bar-shaped guide rod 21 is welded to the outer end thereof, and its semicircular peripheral surface is welded to an adjacent rectangular plate.
The semicircular outer peripheral surface of the guide rod 21 is arranged so as to project from the side surface of the other rectangular plate, and the outer peripheral surface thereof is arranged close to the inner surfaces of the side plates 13 and 13, and the side plates 13 and 13 are arranged. The contact friction or braking with the inner surface is reduced to facilitate the movement of the support arm 18.

The attachment mounting portion 22 is formed by welding a plurality of frame plates into a square tubular shape, and the outer peripheral portion thereof is welded to the end portion of the support arm 18 to be attached, and the plate-shaped attachment 23 can be hooked to the upper end portion thereof. Welding.
The cylinder base 24 has substantially the same length as the vehicle cradle 9, and is formed in a horizontally long rectangular plate shape slightly narrower than the width of the cylinder installation space 20, and a substantially house-shaped notch groove 25 is formed in the length direction thereof. A pair of fluid pressures are arranged on both sides of the notch groove 25, and in the embodiment, hydraulic cylinders 26 and 27 are arranged at symmetrical positions.

The cylinder base 24 is formed on a plate body thicker than the outer diameter of the conduit described later, and the fluid pressure cylinders 26, 27, and the hydraulic cylinders 26, 27 in the embodiment, are attached to the brackets 28, 29 erected on the upper surface thereof. One end is connected, piston rods 30 and 31 are arranged so as to be expandable and contractible at the other end, and the tip ends of the piston rods 30 and 31 are connected to connecting pins 32 and 33 which are connecting portions.
The connecting pins 32 and 33 are projected downward from the bottom surfaces of the left and right support arms 18 and 18, and the shaft portions thereof are connected to the piston rods 30 and 31, and the expansion and contraction displacement of the piston rods 30 and 31 is applied to the support arms 18 and 31. It is possible to transmit to 18.

Oil conduits 34 to 37, which are conduits, are piped inside the notch groove 25, and these are connected to both ends of the hydraulic cylinders 26 and 27 to supply and discharge pressure oil from the fluid pressure device 5b, and in the embodiment, the hydraulic device 5b. However, the piston rods 30 and 31 can be expanded and contracted individually.
A base sheet 38 is polymerized and welded to the lower surface of the cylinder base 24, and both ends of the welded cylinder base 24 and the assembly of the base sheet 38 in the length direction are fixed by screws or bolts 39. The shape of the base sheet 38 is formed in a rectangular plate thinner than the cylinder base 24, and a notch groove 56 having the same shape as the notch groove 25 is formed on the plate surface.

In the assembly of the oil conduits 34 and 36 and the oil conduits 35 and 37, the oil conduits 34 to 37 are bent into a large and small L shape, and a joint with a hexagon nut is attached to one end thereof, and the hydraulic cylinders 26 and 27 are attached. One end of the oil conduits 34 to 37 is assembled to the vehicle, and the other end is fitted with the joint after assembling the cylinder base 24 and the base sheet 38 into the vehicle cradle 9.
Then, the assemblies of the hydraulic cylinders 26 and 27 and the oil conduits 34 to 37 are assembled to the assembly of the cylinder base 24 and the base seat 38, and then assembled to the vehicle cradle 9.

Next, when incorporating the assembly of the hydraulic cylinders 26, 27, the oil conduits 34 to 37, the cylinder base 24, and the base sheet 38 into the cylinder installation space 20, the assembly is arranged in the cylinder installation space 20, and the oil conduits 34 to 34 to The other end of the 37 is inserted into the insertion hole (not shown) of the oil conduit of the substrate 11 and protrudes downward, the joint is attached to the end of the pipe, and most of the oil conduits 34 to 37 are notched grooves 25 and 56. The piping is compact and orderly without protruding from the cylinder.

The oil conduits 34 and 36 are arranged parallel to the assembly of the cylinder base 24 and the base sheet 38 along the hypotenuse of the notch grooves 25 and 56, and the oil conduits 35 and 37 are approximately half the length of the oil conduits 34 and 36. Are arranged coaxially in a plane at the center of the notch grooves 25 and 56.
As shown in the drawing, one end of the oil conduits 34 to 37 is piped so as to project downward from the substrate 11, and the connection with the oil conduit (not shown) to be piped inside the support column 7 directly below the vehicle cradle 9 can be easily performed. I try to be good at it.

In addition, in the figure, reference numeral 40 denotes a guide post for supporting the columns 6 and 7, and an axle 44 of a traveling wheel 43 is erected on a flange 41 at a base end thereof via a U bolt 42. Reference numeral 45 denotes a moving rail provided in the pit 2, which is arranged so that the traveling wheel 43 can travel. 46 is a traveling motor, and a chain 50 is wound between the driving sprocket 47 and the driven sprocket 49 of the moving box 48. Has been done.

A moving chain 53 is wound in an inverted S shape between a sprocket 51 that can rotate synchronously with the driven sprocket 49 and a sprocket 52 arranged at a position close to the sprocket 51, and one end of the chain 53 is wound around the end of the moving rail 45. It is fixed, and the other end is fixed at an appropriate position in the pit 2 on the fixed lift 8 side.

The vehicle maintenance lift of the present invention configured in this way is provided with elevating columns 6 and 7 inside the pit 2 so as to be able to move up and down, and is provided with substantially the same vehicle cradle 8 and 9 at the upper end thereof.
Explaining this with the vehicle cradle 9 of the mobile lift 4, the vehicle cradle 9 is assembled with a thick frame material (steel material) to form a substantially box-shaped cross section, and the inside thereof is a lower cylinder. It is divided into an installation space 20 and a support arm moving space 19 immediately above the installation space 20.

Therefore, the vehicle cradle 9 has a larger cross-sectional coefficient and is stronger than the one having a structure having a substantially flat cross section, and can sufficiently withstand the bending moment applied to the vehicle cradle 9 when supporting the vehicle.
Moreover, the vehicle pedestal 9 of the embodiment is closed by welding a thick erection plate 14 to the upper ends of the side plates 13 and 13, and the cross section of the vehicle pedestal 9 is formed in a horizontally long box shape. , The section modulus is further increased to enhance the strength, and the safety when the vehicle is loaded by the vehicle cradle 9 is improved.

On the other hand, since the vehicle cradle 9 internally divides the cylinder installation space 20 and the support arm moving space 19 directly above the cylinder installation space 20 into upper and lower parts as described above, a box-shaped slider is attached to the bottom plate as in the conventional case. Compared to the one in which the cylinder is arranged inside, the vehicle cradle 9 is flat and small in height, the configuration is simplified, and the constituent members can be easily assembled.

Next, when assembling the hydraulic cylinders 26 and 27 to the cylinder installation space 20, the cylinder base 24 and the base sheet 38 are first overlapped and welded, and the oil conduits 34 to the assembly of the cylinder base 24 and the base sheet 38 are joined. Assemble the hydraulic assembly in which one end of 37 is connected to both ends of the hydraulic cylinders 26 and 27.

Then, the assemblies of the hydraulic cylinders 26 and 27 and the oil conduits 34 to 37 are symmetrically installed on both sides of the notch grooves 25 of the assembly obtained by superimposing and welding the cylinder base 24 and the base sheet 38, and the notch grooves 25 and 56 are also installed. One end of the oil conduits 34 to 37 is inserted into the pipe, and the cylinder base 24 and the base sheet 38 are laminated and welded to each other so as to project downward and piped.

Therefore, one end side of the oil conduits 34 to 37 is piped into the notch groove 56 of the base sheet 38 and the notch groove 25 formed in the cylinder base 24 having a wall thickness thicker than that, so that it protrudes from the cylinder base 24 and the base sheet 38. It is neatly and compactly piped without any trouble. The assembly status of the oil conduits 34 to 37, the cylinder base 24, and the base sheet 38 is as shown in FIGS. 5 to 7.
In this case, in the assembly of the oil conduits 34, 36 and the oil conduits 35, 37, each oil vessel 34 to 37 is bent into a large and small L shape, and a joint with a hexagon nut is attached to one end thereof. Assemble one end of the oil conduits 34 to 37 to the hydraulic cylinders 26 and 27.
Then, after assembling the hydraulic cylinders 26 and 27 and the oil conduits 34 to 37 to the assembly of the cylinder base 24 and the base sheet 38, the hydraulic cylinders 26 and 27, the oil conduits 34 to 37, the cylinder base 24 and the base sheet are assembled. Assemble the 38 assemblies to the vehicle cradle 9.

Next, when the assembly of the hydraulic cylinders 26, 27, the oil conduits 34 to 37, the cylinder base 24, and the base sheet 38 is incorporated into the cylinder installation space 20, the assembly is arranged in the cylinder installation space 20 and the oil conduit 34 is installed. The other end of ~ 37 is inserted into the insertion hole of the oil conduit of the substrate 11 and protrudes downward, and the joint is attached to the pipe end. This built-in situation is shown in FIGS. 7 and 8.
After that, the support arms 18 and 18 are incorporated into the vehicle cradle 9.
At that time, the support arms 18 and 18 are inserted into the support arm moving space 19 with the attachment mounting portion 22 on the outside, and the lower surface thereof is placed on the guide surfaces 15a and 15a of the guides 15 and 15.

The support arms 18 and 18 are configured to be substantially the same, which is configured by superimposing a plurality of horizontally long rectangular plates, and a round bar-shaped guide rod 21 is welded to the peripheral surface of a recess in the middle portion thereof. The peripheral surface is welded to an adjacent rectangular plate, and the semicircular peripheral surface on the outer side thereof projects outward from the side surface of the support arm 18.

The assembling situation is as shown in FIGS. 10 and 11, the support arms 18 and 18 are slidably mounted on the guide surfaces 15a and 15a, and the top of the semicircular peripheral surface of the guide rod 21 is the side plate 13. It is slidably and engageably arranged inside 13.
Further, the lower surfaces of the support arms 18 and 18 directly above the cylinder installation space 20 are arranged apart from the hydraulic cylinders 26 and 27, and the stopper pin 54 which is a stopper is arranged between the hydraulic cylinders 26 and 27.

After that, the tips of the piston rods 30 and 31 are connected to the connecting pins 32 and 33 projecting from the lower surfaces of the support arms 18 and 18, and the other ends of the oil conduits 34 to 37 projecting downward to the outside of the substrate 11. The portion is connected to an oil conduit (not shown) that is piped to the support column 7.
At that time, since the other end of the oil conduits 34 to 37 protrudes below the substrate 11, the oil conduits 34 to 37 and the oil conduits piped to the columns 7 can be easily and efficiently connected.

The vehicle pedestal 9 assembled in this way is as shown in FIGS. The support arms 18 and 18 or the vehicle cradle 9 can be made thinner or more compact than the above.

The vehicle cradle 9 is attached to the upper end of the support column 7, and before its use, the attachment 23 is removed from the attachment mounting portion 22, and the support arms 18 and 18 contract and move into the support arm moving space 19. The support column 7 is lifted down and housed in the pit 2.
This situation is as shown in FIGS. 2 to 4, and the erection plate 14 at the upper part of the vehicle cradle 9 is located at substantially the same height as the work floor surface 1.

When loading a vehicle on the support arms 18 and 18 under such a situation, the vehicle under test is moved to the work floor surface 1 of the automobile maintenance shop, and the moving lift 4 is moved to keep the distance from the fixed lift 3. After adjusting the distance between the front and rear wheels of the vehicle to be inspected, the attachment 23 is attached to the attachment attachment portion 22, and the columns 6 and 7 are lifted up.

At that time, the support arms 18 and 18 or the vehicle cradle 8 and 9 are thin and small in height, and the height from the work floor surface 1 is suppressed. Therefore, the pit 2 is slightly lifted up by the columns 6 and 7. Escape from and move directly above the work floor surface 1.
Therefore, there is no possibility that the upper erection plate 14 will come into contact with or collide with the lower part of the test vehicle due to the lowering of the vehicle height of the test vehicle and the lower position of the jack-up point as in recent years, and the support The arms 18 and 18 are extended to position the attachment 23 directly below the jack-up point.

In this case, the support positions of the attachments 23 and 23 are adjusted by the support arms 18 and 18 by individually expanding and contracting the hydraulic cylinders 26 and 27, and expanding and contracting the piston rods 30 and 31 of the cylinders 26 and 27. , The connecting pins 32 and 33 connected to the tip thereof are moved to move the support arms 18 and 18, and their movement positions are adjusted to the jack-up point positions.

At that time, the support arms 18 and 18 are prevented from moving outward by the stopper pins 54 and 54 projecting from the bottom surface contacting the engaging protrusions 55 and 55 which are contact portions, while the support arms 18 and 18 As for the inward movement of 18, their inner ends are arranged so as to be abuttable to prevent the inward movement, and the safety in use is ensured.

As described above, in the automobile maintenance lift of the present invention, the vehicle cradle is made small or flat and robust, and the vehicle can be raised in response to the lowering of the height of the vehicle under test and the lowering of the jack-up point. It is suitable for maintenance lifts for large vehicles, for example, because it can be safely lifted up and maintained and inspected, and it can be easily manufactured.

2 Pit 5a, 5b Fluid pressure device (hydraulic system)
6,7 Lifting column 8,9 Vehicle cradle 11 Board 14 Elevation board 15 Guide 18 Support arm 19 Support arm Moving space

20 Cylinder installation space 21 Guide rod 22 Attachment mounting part 23 Attachment 24 Cylinder base 25 Notch groove 26,27 Fluid pressure cylinder (hydraulic cylinder)

32, 33 Connecting part (connecting pin)
34-37 Vessel (oil vessel)
38 Base sheet 54 Stopper (stopper pin)
55 Engagement protrusion 56 Notch groove

Claims (8)

It has a vehicle cradle attached to the upper end of the elevating column and housed so as to be able to appear and disappear in the pit, and the vehicle cradle has a pair of fluid pressure cylinders arranged symmetrically inside and the pair of fluid pressures. In a vehicle maintenance lift provided with a pair of support arms provided so as to be movable in different directions through the operation of cylinders, a support arm moving space and a cylinder installation space are arranged vertically inside the vehicle cradle. A vehicle maintenance lift characterized in that the support arm is movably arranged in the upper support arm moving space and the pair of fluid pressure cylinders are arranged directly under the support arm moving space. The vehicle maintenance lift according to claim 1, wherein a erection plate is arranged and closed over the entire upper portion of the vehicle cradle on the opening side, and the cross section of the vehicle cradle is formed in a hollow substantially box shape. The vehicle maintenance lift according to claim 2, wherein notches are formed at both ends of the erection plate, and an attachment mounting portion provided at the tip of the support arm is engagedably accommodated in the notches. The vehicle maintenance lift according to claim 1, wherein the semicircular peripheral surfaces of both side portions of the support arm are slidably arranged inside both side portions of the vehicle cradle. In the cylinder installation space, a cylinder base on which the pair of fluid pressure cylinders are installed and a base sheet supporting the cylinder base are superposed and arranged, and a notch groove is formed at a corresponding position between the cylinder base and the base sheet. The vehicle maintenance lift according to claim 1, wherein the pair of fluid pressure cylinders are arranged so as to face these notched grooves. The vehicle maintenance lift according to claim 1, wherein a connecting end of a conduit communicating with a fluid pressure device of the pair of fluid pressure cylinders is arranged so as to project downward from the outside of the vehicle cradle. A connecting portion and a stopper are projected downward from the bottom of the support arm, the tip portions of the piston rods of the pair of fluid pressure cylinders are connected to the connecting portion, and the stopper is provided on the vehicle cradle. The vehicle maintenance lift according to claim 1, which is arranged so as to be in contact with the vehicle. The vehicle maintenance lift according to claim 3, wherein the position of the attachment mounting portion provided at the tip end portion of the support arm is adjusted by individually expanding and contracting the pair of fluid pressure cylinders.

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