JP2020073414A - 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, maintenance lifts for large automobiles, the vehicle pedestal is made small or flat and robust, and corresponds to lowering the vehicle height and lowering the jack-up point of the vehicle to be inspected, The present invention relates to a vehicle maintenance lift that allows a vehicle to be safely lifted up for maintenance and inspection and can be easily manufactured.

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

  However, the support frame is generally heavy, and its position adjustment is troublesome and complicated, and especially when the position of the support frame is readjusted after carrying in the vehicle to be inspected, an operator dives under the vehicle to be inspected. Since the work is performed, the work is extremely complicated, and its improvement has been desired.

  In order to meet such a request, a pit is provided on the work floor surface, and one or a plurality of elevating mechanisms having an elevating column and a vehicle pedestal are provided in the pit, and one of them is arranged at a fixed position in the pit, The other elevating mechanism is movably provided, a substrate is arranged at the upper end of the elevating mechanism, guides having a U-shaped cross section are arranged opposite to each other on the substrate, and a pair of sliders are slidably provided on the guides. A box-shaped vehicle pedestal is fixed to the outside of each slider, and an attachment mounting portion to which an attachment is detachable is provided on the outside of the vehicle pedestal, while a pair of cylinder cases are arranged symmetrically between the sliders, The piston rod is pivotally attached to the corresponding cylinder case, the piston rod is extended and retracted, and the slider is moved together with this to remotely adjust the position of the attachment. There is buried type lift vehicle maintenance (e.g., see Patent Document 2).

However, in this buried lift for vehicle maintenance, a cylinder case is arranged directly above a slider, a box-shaped vehicle pedestal is fixed to the outside of the slider, and an attachment mounting portion is provided outside the vehicle pedestal. Therefore, the height from the board to the attachment becomes high, and when not in use, the attachment mounting part may approach the work floor surface and the vehicle pedestal may come into contact with the lower part of the vehicle to be inspected before it escapes from the pit. It was
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 to be inspected and the lowering of the supporting position when the vehicle is jacked up. There is a problem that it is difficult to support the vehicle to be inspected at the position, and work safety cannot be ensured.

Moreover, since the above-mentioned buried lift for vehicle maintenance has the bottom plate for installing the vehicle pedestal slidably arranged on the guide, its structural strength is generally weak and sufficient for the bending moment accompanying the support of the vehicle under test. There was a problem that I could not stand.
Also, if the pair of attachments are spaced apart 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 case. There were problems such as rusting of the case, deterioration of function, and easy failure.

Japanese Utility Model Publication No. 63-139294 Utility model registration No. 2507116

  The present invention solves such a problem, and is suitable for, for example, a maintenance lift for a large vehicle, and the vehicle pedestal is configured to be small or flat and robust to reduce the vehicle height of the vehicle to be inspected and to provide a jack-up point. It is an object of the present invention to provide a vehicle maintenance lift that can be lifted up safely for maintenance and inspection, and that can be easily manufactured in response to lowering the position.

  The invention according to claim 1 has a vehicle pedestal that is attached to the upper end portion of the lifting column and is housed so as to be retractable in the pit, and the vehicle pedestal is a pair of fluid pressure cylinders symmetrically arranged inside. And a pair of support arms movably provided in different directions through the operation of the fluid pressure cylinder, the support arm moving space and the cylinder installation space inside the vehicle cradle. Are arranged above and below, the support arm is movably arranged in the upper support arm moving space, and a pair of fluid pressure cylinders is arranged immediately below the support arm moving space, and the support arm and the fluid are placed in these spaces. The pressure cylinder is rationally and compactly arranged to flatten the vehicle pedestal and make it smaller or more compact. Together it may correspond to 置化, and simplify the structure.

According to the invention of claim 2, a erection plate is arranged and closed in the entire upper side of the opening side of the vehicle pedestal to form a cross section of the vehicle pedestal into a hollow and substantially box shape, and the cross section coefficient of the vehicle pedestal is increased. The support arm is firmly supported to support 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 plate protects the inside of the vehicle cradle, prevents the intrusion of water such as cleaning water, and prevents the rusting and deterioration of the function of the internal components.
According to the invention of claim 3, notches are formed at both ends of the erection plate, and the attachment mounting portion provided at the tip of the support arm is engageably housed in the notch, and the support arm contracts with a simple configuration. In this case, the occupied space is made compact and the mechanism is simplified.

According to the invention of claim 4, the semicircular peripheral surfaces of both sides of the support arm are slidably disposed inside the both sides of the vehicle cradle so that the support arm can be moved smoothly and stably. There is.
According to a fifth aspect of the present invention, a cylinder base for installing a pair of fluid pressure cylinders and a base sheet for supporting the cylinder base are superposed in a cylinder installation space, and a notch is provided at a corresponding position of the cylinder base and the base sheet. Grooves are formed and a pair of fluid pressure cylinders are arranged so as to face these notch grooves, the pair of fluid pressure cylinders are reasonably spaced apart, and a conduit connecting to the fluid pressure cylinders is arranged along the notch grooves. At the same time, it is arranged so that it can be arranged in an orderly and compact manner.

According to a sixth aspect of the present invention, the connecting end portion 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 pedestal, and the connection with the conduit for piping in the lifting column can be easily and easily performed. I try to be good at it.
According to a seventh aspect of the present invention, a connecting portion and a stopper are provided on the bottom portion of the support arm so as to project downward, the piston rod tip of the fluid pressure cylinder is connected to the connecting portion, and the stopper is provided on the vehicle pedestal. It is arranged so that it can come into contact with the mating protrusion, and the range of movement of the support arm is regulated so that stable movement and safe operation of the support arm are realized.

  According to the invention of claim 1, the support arm moving space and the cylinder installation space are vertically arranged inside the vehicle pedestal, and the support arm is movably arranged in the upper supporting arm moving space. Since a pair of fluid pressure cylinders are placed directly underneath, a support arm and fluid pressure cylinders are reasonably and compactly placed in these spaces to flatten the vehicle cradle and make it smaller or more compact. The vehicle height can be lowered and the jack-up point can be lowered, and the structure can be simplified.

According to the invention of claim 2, the erection plate is arranged and closed over the entire opening side upper portion of the vehicle pedestal, and the transverse cross section of the vehicle pedestal is formed into a substantially hollow box shape. It is large and robust, supports the support arm firmly, responds to the bending moment applied to the support arm when supporting the vehicle under test, and makes it possible to safely lift up the vehicle for maintenance and inspection. The inside of the vehicle pedestal can be protected by the installation plate, water such as washing water can be prevented from entering, and rusting and functional deterioration of internal components can be prevented in advance.
According to the invention of claim 3, notches are formed at both ends of the erection plate, and the attachment mounting portion provided at the tip of the support arm is accommodated in the notch so that the support arm is occupied when contracted. The space can be made compact and the mechanism can be simplified.

According to the invention of claim 4, since the semicircular peripheral surfaces of both sides of the support arm are slidably arranged inside the both sides of the vehicle pedestal, the support arm can be smoothly and stably moved. ..
According to a fifth aspect of the present invention, a cylinder base for installing a pair of fluid pressure cylinders and a base sheet for supporting the cylinder base are superposed in a cylinder installation space, and a notch is provided at a corresponding position of the cylinder base and the base sheet. Since the grooves are formed and the pair of fluid pressure cylinders are arranged so as to face these notch grooves, the pair of fluid pressure cylinders should be reasonably separated and the conduits connected to the fluid pressure cylinders should be arranged in the notch grooves. Along the way, it can be neatly and compactly piped.

According to the sixth aspect of the invention, 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 pedestal. It can be performed with good workability.
According to a seventh aspect of the present invention, a connecting portion and a stopper are provided on the bottom portion of the support arm so as to project downward, the piston rod tip of the fluid pressure cylinder is connected to the connecting portion, and the stopper is provided on the vehicle pedestal. Since it is arranged so as to be able to come into contact with the mating protrusion, it is possible to restrict the movement range of the support arm and realize stable movement and safe operation of the support arm.

It is a front view showing the situation at the time of lift-up of the moving lift applied to the present invention. It is a top view which expands and shows the situation at the time of the lift down of the fixed lift and mobile lift which were applied to this invention. It is a front view showing the situation at the time of lift down of the mobile lift applied to the present invention. FIG. 4 is a right side view of FIG. 3. FIG. 2 is an enlarged plan view showing a cylinder base arranged in a lower portion inside a vehicle pedestal applied to the present invention, in which a pair of fluid pressure cylinders are symmetrically arranged outside a cutout groove.

It is a front view of FIG. It is a front view showing the situation where a pair of fluid pressure cylinders were attached to a vehicle pedestal applied to the present invention. FIG. 8 is a right side view of FIG. 7. It is a top view which expands and shows one of the vehicle pedestal applied to this invention, and the support arm assembled to this. It is a front view which expands and shows a fluid pressure cylinder and the support arm which were attached to the vehicle pedestal applied to this invention.

FIG. 11 is a right side view of FIG. 10. FIG. 1 is a plan view of a vehicle pedestal applied to the present invention, showing a protruding state of left and right support arms.

Hereinafter, the illustrated embodiment in which the present invention is applied to a maintenance lift for a large vehicle will be described. In FIGS. 1 to 12, 1 is a work floor of an automobile maintenance factory, and a long pit 2 is covered on the floor 1. It is provided along the approach direction of the inspection vehicle.
A fixed lift 3 and a movable lift 4 are provided inside the pit 2, and these lifts 3 and 4 are extendable / contractible and elevating / lowering with an elevating mechanism operated and controlled by a fluid pressure device 5a, in the embodiment, a hydraulic device 5a. Elevating columns 6 and 7 in the form of rectangular tubes are provided, and vehicle pedestals 8 and 9 are arranged at the upper ends of the columns 6 and 7.
In the figure, 10 is a pit cover in which the opening of the pit 2 is openable and closable, and is placed on the same level surface as the work floor surface 1.

The vehicle pedestals 8 and 9 are configured substantially the same, and for convenience of explanation, the vehicle pedestal 9 on the moving lift 4 side will be described.
The vehicle pedestal 9 is formed in a horizontally long, rigid and substantially box-like shape. This is a horizontally long rectangular substrate 11 having an insertion hole (not shown) for an oil conduit, which is a conduit, and on the substrate 11. A horizontally-long rectangular table plate 12 having a larger wall thickness that is superposed and welded, thick side plates 13 and 13 that are welded and opposed to each other on both sides of the table plate 12, and upper end portions of the side plates 13 and 13. It is composed of a thick installation plate 14 welded to each other and a pair of thick guides 15, 15 welded on both sides of the table plate 12 and inside the side plates 13, 13.
In the figure, reference numerals 16 and 17 denote rectangular notches formed at both ends of the erection plate 14 in the lengthwise direction, and the attachment mounting portions to be described later are accommodated in the notches 16 and 17 so as to be engageable with each other.

As shown in FIGS. 8 and 11, the transverse cross section of the vehicle pedestal 9 is formed into a horizontally long rectangular box shape, and a hollow space inside the pedestal 9 is divided into upper and lower portions at the positions of the guide surfaces 15a and 15a of the guides 15 and 15, respectively. The support arm moving space 19 of the support arm 18 is formed above the partition, 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, instead of the box-shaped cross section of the vehicle pedestal 9, the erection plate 14 may be omitted and the vehicle pedestal 9 may be formed in a substantially U-shape with an opening at the top.

The moving space 19 is formed in a horizontally long rectangle defined by the side plates 13 and 13, the inner surface of the erection plate 14 or 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 come into contact with each other, and the inner movement positions thereof are regulated so that the span of the vehicle loading position by the left and right attachments described later can be minimized. ..

That is, a stopper pin 54, which is a stopper, is provided so as to project downward at an outer position of a connecting pin, which is a connecting portion described later, on the bottom surface of the support arms 18, 18, and the stopper pin 54 is provided at both end portions of a cylinder base described later. It is arranged so as to be able to come in contact with stoppers 55, 55 which are engaging projections protrudingly provided.
The stoppers 55, 55 are capable of restricting the movement positions outside the support arms 18, 18 so as to maximize the loading position span of the vehicle by the left and right attachments, which will be described later.

  The cylinder installation space 20 is located immediately below the support arm movement space 19, is partitioned by the inner surfaces of the table plates 12 and 12 and the guides 15 and 15 and their heights, and is narrower in width than the movement 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 stacking a plurality of horizontally long rectangular plates, and the width of the rectangular plate is formed to be slightly narrower than the facing distance between the side plates 13 and 13, and the rectangular plate arranged in the middle thereof. Is further narrowed as shown in FIG. 11, a round rod-shaped guide rod 21 is welded to its outer end, 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 another rectangular plate, and the outer peripheral surface thereof is arranged close to the inner surfaces of the side plates 13, 13. Contact friction with the inner surface or braking is reduced, and the movement of the support arm 18 is facilitated.

The attachment mounting portion 22 is formed into a rectangular tube shape by welding a plurality of frame plates, and its outer peripheral portion is welded and attached to an end portion of the support arm 18, and a plate-like attachment 23 can be hooked on the upper end portion thereof. It is arranged.
The cylinder base 24 has substantially the same length as the vehicle pedestal 9, and is formed in a horizontally long rectangular plate shape slightly narrower than the horizontal 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, that is, hydraulic cylinders 26 and 27 in the embodiment are arranged at symmetrical positions on both sides of the cutout groove 25.

The cylinder base 24 is formed in a plate body having a wall thickness larger than the outer diameter of the conduit described later, and brackets 28, 29 erected on the upper surface of the cylinder base 24 are connected to the fluid pressure cylinders 26, 27, in the embodiment, the hydraulic cylinders 26, 27. One end is connected and piston rods 30 and 31 are arranged at the other end so as to be expandable and contractable, 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 provided on the bottom surfaces of the left and right supporting arms 18 and 18 so as to project downward, and the shaft portions thereof are connected to the piston rods 30 and 31 so that the expansion and contraction displacement of the piston rods 30 and 31 can be prevented. 18 can be transmitted.

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

The oil conduits 34, 36 and the oil conduits 35, 37 are assembled by bending the oil conduits 34 to 37 into large and small L-shapes, and attaching a joint with a hexagonal nut attached to one end thereof, to form the hydraulic cylinders 26, 27. One end of the oil conduits 34 to 37 is assembled to the other end, and the other end is assembled with the cylinder base 24 and the base seat 38 in the vehicle pedestal 9 and then the joint is attached.
The assembly of the hydraulic cylinders 26 and 27 and the oil conduits 34 to 37 is assembled to the assembly of the cylinder base 24 and the base seat 38, and then assembled to the vehicle pedestal 9.

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

The oil conduits 34, 36 are arranged in parallel on the assembly of the cylinder base 24 and the base sheet 38 along the oblique sides of the cutout grooves 25, 56, and the oil conduits 35, 37 are approximately half the length of the oil conduits 34, 36. Are arranged coaxially in a plane at the centers of the cutout grooves 25, 56.
One end of each of the oil conduits 34 to 37 is piped so as to project below the substrate 11 as shown in the drawing, and connection with an oil conduit (not shown) that is piped inside the column 7 directly below the vehicle pedestal 9 is easy and workable. I try to be good at it.

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

  A moving chain 53 is wound in an inverted S shape between a sprocket 51 that is rotatable in synchronism with the driven sprocket 49 and a sprocket 52 that is arranged in the vicinity of the sprocket 51. One end of the moving chain 53 is the end of the moving rail 45. It is fixed, and the other end is fixed to an appropriate place of the pit 2 on the fixed lift 8 side.

The vehicle maintenance lift of the present invention thus constructed is provided with the elevating columns 6 and 7 capable of ascending and descending inside the pit 2, and has substantially the same vehicle receiving pedestals 8 and 9 at the upper ends thereof.
This will be described with reference to the vehicle pedestal 9 of the movable lift 4. The vehicle pedestal 9 is formed by assembling a thick frame material (steel material) into 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 movement space 19 immediately above it.

Therefore, the vehicle pedestal 9 has a larger section modulus and is stronger than a vehicle pedestal having a substantially flat cross section, and can sufficiently withstand a bending moment applied to the vehicle pedestal 9 when supporting the vehicle.
Moreover, in the vehicle pedestal 9 of the embodiment, the thick erection plate 14 is welded to the upper ends of the side plates 13 and 13 to close it, so that the vehicle pedestal 9 is formed in a laterally long box shape. The sectional modulus is further increased, the strength is enhanced, and the safety when the vehicle is loaded on the vehicle pedestal 9 is improved.

  On the other hand, as described above, the vehicle pedestal 9 has the cylinder installation space 20 and the support arm moving space 19 immediately above the cylinder installation space divided into the upper and lower parts. Therefore, a box-shaped slider is attached to the bottom plate as in the conventional case. The vehicle pedestal 9 is flat and has a small height, and the structure is simplified as compared with the case where the cylinder is arranged inside, and the constituent members can be easily assembled.

  Next, when assembling the hydraulic cylinders 26 and 27 into the cylinder installation space 20, first, the cylinder base 24 and the base sheet 38 are polymerized and welded, and the oil pipe 34 to the assembly of the cylinder base 24 and the base sheet 38. 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 installed symmetrically on both sides of the notch groove 25 of the assembly obtained by superposing and welding the cylinder base 24 and the base sheet 38, and the notch grooves 25 and 56. One end of the oil pipes 34 to 37 is inserted into the pipe, and the pipe is projected and piped below the assembly in which the cylinder base 24 and the base sheet 38 are polymerized and welded.

Therefore, one end side of the oil conduits 34 to 37 is piped into the cutout groove 56 of the base sheet 38 and the cutout groove 25 formed in the cylinder base 24 having a thickness larger than that, so that the oil conduits 34 to 37 project from the cylinder base 24 and the base sheet 38. It is neatly and compactly piped without doing. The assembled state of the assembly of the oil conduits 34 to 37, the cylinder base 24 and the base sheet 38 is as shown in FIGS.
In this case, the oil conduits 34, 36 and the oil conduits 35, 37 are assembled by bending each of the oil conduits 34 to 37 into large and small L-shapes, and attaching a joint having a hexagon nut attached to one end thereof. One end of the oil conduits 34 to 37 is attached to the hydraulic cylinders 26 and 27.
After assembling the assembly of 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. Assemble assembly 38 to vehicle cradle 9.

Next, when the assembly of the hydraulic cylinders 26 and 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 base plate 11 and projected downward, and the joint is attached to the pipe end. This installation status is as shown in FIGS.
After that, the support arms 18, 18 are incorporated into the vehicle pedestal 9.
At this time, the support arms 18, 18 are inserted into the support arm moving space 19 with the attachment mounting portion 22 on the outside, and the lower surfaces thereof are placed on the guide surfaces 15a, 15a of the guides 15, 15.

  The support arms 18 and 18 have substantially the same structure. The support arms 18 and 18 are formed by stacking a plurality of horizontally long rectangular plates. The peripheral surface is welded to an adjacent rectangular plate, and the semicircular peripheral surface on the outer side thereof is projected to the outside of the side surface of the support arm 18.

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

After that, the tip ends 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 outward and downward of the substrate 11. The section is connected to an oil conduit (not shown) that is connected to the support column 7.
At this time, since the other ends of the oil conduits 34 to 37 project below the substrate 11, the oil conduits 34 to 37 can be easily and efficiently connected to the oil conduits connected to the support columns 7.

  The vehicle pedestal 9 assembled in this manner is as shown in FIGS. 10 and 11, and the support arms 18 and 18 have a simple structure in which the plate members are superposed and arranged. Therefore, the plate members are assembled in a box shape and the piston rod is arranged therein. In comparison with the above, the support arms 18, 18 or the vehicle pedestal 9 can be made thinner or more compact.

The vehicle pedestal 9 is attached to the upper end of the 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 to move into the support arm moving space 19. The pillar 7 is lifted down and accommodated in the pit 2.
This situation is as shown in FIGS. 2 to 4, in which the erection plate 14 above the vehicle pedestal 9 is located substantially at the same height as the work floor surface 1.

  When the vehicle is loaded on the support arms 18 and 18 under such a condition, the vehicle to be inspected is moved to the work floor surface 1 of the automobile maintenance shop, and the movable lift 4 is moved so that the distance between the fixed lift 3 and the fixed lift 3 is increased. After adjusting the distance between the front and rear wheels of the vehicle to be inspected, the attachment 23 is mounted on the attachment mounting portion 22 and the columns 6 and 7 are lifted up.

At this time, the support arms 18, 18 or the vehicle pedestals 8, 9 are thin and have a small height, and the height from the work floor surface 1 is suppressed. Escape from and move directly above the work floor 1.
Therefore, due to the lowered vehicle height and the lowered jack-up point of the vehicle to be inspected recently, there is no fear that the upper erection plate 14 will contact or collide with the lower periphery of the vehicle to be supported. The arms 18 and 18 are extended to position the attachment 23 just below the jack-up point.

  In this case, the adjustment of the support position of the attachments 23, 23 by the support arms 18, 18 is performed by individually expanding and contracting the hydraulic cylinders 26, 27 to expand and contract the piston rods 30, 31 of the cylinders 26, 27. , The supporting pins 18, 18 are moved by moving the connecting pins 32, 33 connected to the distal ends thereof, and the moving positions thereof are adjusted to the jack-up point position.

  At this time, the support arms 18, 18 are prevented from moving outward by the stopper pins 54, 54 projecting on the bottom surface coming into contact with the engaging projections 55, 55 that are contact portions, while the support arms 18, 18 are blocked. The inward movement of 18 is arranged such that their inner end portions are abuttable so as to prevent the inward movement, so that safety in use is ensured.

  As described above, the vehicle maintenance lift of the present invention has a small or flat vehicle cradle and is robustly configured to support the low vehicle height and the low jack-up point of the vehicle to be inspected. This is suitable for maintenance lifts for large vehicles, for example, because it can be safely lifted up for maintenance and inspection and can be easily manufactured.

2 Pits 5a, 5b Fluid pressure device (hydraulic device)
6,7 Elevating column 8,9 Vehicle cradle 11 Board 14 Construction plate 15 Guide 18 Support arm 19 Support arm movement 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 Connection part (connection pin)
34-37 conduit (oil conduit)
38 Base Sheet 54 Stopper (Stopper Pin)
55 Engagement Protrusion 56 Notch Groove

Claims (7)

  There is a vehicle pedestal that is attached to the upper end of the lifting column and that is housed in the pit so that it can be retracted and retracted. The vehicle pedestal has a pair of fluid pressure cylinders that are symmetrically arranged inward, and a fluid pressure cylinder of the fluid pressure cylinder. In a vehicle maintenance lift including a pair of support arms operatively provided in different directions, a support arm moving space and a cylinder installation space are vertically arranged inside the vehicle cradle, and an upper side is provided. A vehicle maintenance lift characterized in that a support arm is movably arranged in the support arm moving space, and a pair of fluid pressure cylinders are arranged immediately below the support arm moving space.   2. The vehicle maintenance lift according to claim 1, wherein a erection plate is arranged and closed over the entire opening-side upper portion of the vehicle pedestal, and the vehicle pedestal is formed into a hollow box-like cross section.   3. 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 a front end of the support arm is engageably accommodated in the notches.   The vehicle maintenance lift according to claim 1, wherein semicircular peripheral surfaces of both sides of the support arm are slidably disposed inside both sides of the vehicle cradle.   In the cylinder installation space, a cylinder base for installing a pair of fluid pressure cylinders and a base sheet supporting the cylinder base are superposed and arranged, and notch grooves are formed at corresponding positions of the cylinder base and the base sheet. 2. The vehicle maintenance lift according to claim 1, wherein a pair of fluid pressure cylinders are arranged so as to face the notch groove.   2. The vehicle maintenance lift according to claim 1, wherein a connecting end portion of a 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 pedestal. A connecting portion and a stopper are provided on the bottom of the support arm so as to project downward, and the tip portion of the piston rod of the fluid pressure cylinder is connected to the connecting portion so that the stopper can be brought into contact with an engaging protrusion provided on a vehicle pedestal. The vehicle maintenance lift according to claim 1, wherein the lift is arranged in the.

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