JP2000053388A - Lift for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To synchronize left and right elevating/lowering tables arrayed in parallel in hydraulic pressure and to always stably elevate/lower a lift, even if offset load of a maintenance vehicle exists. SOLUTION: On the side of a bottom surface before and after a right side elevating/lowering table, a first hydraulic cylinder 100A and a second hydraulic cylinder 100B are installed. On the side of a bottom surface before and after a left side elevating/lowering table, a third hydraulic cylinder 100 C and a fourth hydraulic cylinder 100D are installed. The side of a piston raising chamber 101 of the first hydraulic cylinder 100A and the side of a piston raising chamber 101 of the third hydraulic cylinder 100C are connected with a hydraulic path L from the same hydraulic pump 210. The side of a piston lowering chamber 102 of the first hydraulic cylinder 100A and the side of a piston raising chamber 101 of the fourth hydraulic cylinder 100D are connected by the hydraulic path L. The side of the piston lowering chamber 102 of the third hydraulic cylinder 100C and the side of a piston raising chamber 102 of the second hydraulic cylinder 100B are connected by the hydraulic path L.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle lift for lifting a vehicle to an appropriate height during maintenance of the vehicle.

Various types of such vehicle lifts have already been proposed. For example, a so-called drive-on type vehicle lift, in which a maintenance vehicle (including an inspection vehicle and the like) is carried in while each wheel is carried, A thin vehicle lift with a vertically integrated frame part assembled in an X-shape and a compact overall structure, and a relatively large two-stage hydraulic cylinder buried vertically in the floor of a maintenance shop. Vehicle lifts and the like.

[0003] In any vehicle lift, there are provided left and right lifting tables arranged in parallel on which wheels and a bottom portion of the maintenance vehicle are mounted, and the left and right lifting tables are synchronized when the lift is driven. A connecting member is generally attached between the left and right elevating tables so as to be raised and lowered.
A mechanical connection is provided.

[0004]

The right and left elevating tables are raised and lowered in synchronism during the lift operation by the connecting member connecting the left and right elevating tables. However, there are the following problems.

[0005] First, since the connection between the left and right lifting tables is a mechanical coupling structure, it is necessary to have a considerable mechanical strength, which has led to an increase in manufacturing costs.

Next, when the connection between the left and right elevating tables is a mechanical connection, high precision is required in manufacturing and assembling, and this also causes an increase in manufacturing cost.

Further, in the case of such a mechanical coupling structure, when the load between the left and right lifting tables becomes an eccentric load, the lifting table on the light side rises first as compared with the lifting table on the heavy side. It is difficult to maintain the horizontality of the left and right elevating tables, which sometimes poses a danger.

The present invention has been made in view of such conventional circumstances, and has been devised in a hydraulic pipeline system between a plurality of hydraulic cylinders for elevating the left and right elevating tables and a plurality of two-stage hydraulic cylinders. To eliminate the mechanical connection between the left and right lifting tables, and to provide a vehicle lift that stably lifts the left and right lifting tables even when there is an eccentric load. .

[0009]

According to a first aspect of the present invention, there is provided a vehicle lift in which a maintenance vehicle is raised and lowered by raising and lowering left and right lifting tables arranged in parallel.
A first hydraulic cylinder and a second hydraulic cylinder are installed on front and rear bottom surfaces of the right lifting table, and a third hydraulic cylinder and a fourth hydraulic cylinder are mounted on front and rear bottom surfaces of the left lifting table.
While installing a hydraulic cylinder, a hydraulic path from the same hydraulic pump is connected to the piston raising chamber side of the first hydraulic cylinder and the piston raising chamber side of the third hydraulic cylinder, and the piston of the first hydraulic cylinder The descending chamber side is connected to the piston rising chamber side of the fourth hydraulic cylinder by a hydraulic path, and the piston descending chamber side of the third hydraulic cylinder is connected to the piston rising chamber side of the second hydraulic cylinder by a hydraulic path. A vehicle lift characterized in that:

According to a second aspect of the present invention, in a vehicle lift in which a maintenance vehicle is raised and lowered by raising and lowering left and right lifting tables arranged in parallel, a first hydraulic cylinder serving as lifting means for the right lifting table. And a second hydraulic cylinder are provided at the same location, and a third hydraulic cylinder and a fourth hydraulic cylinder, which serve as lifting means for the left lifting table, are provided at the same location, while the piston lifting chamber side of the first hydraulic cylinder is provided. And a hydraulic path from the same hydraulic pump is connected to the piston lift chamber side of the third hydraulic cylinder,
A piston path of the first hydraulic cylinder is connected to a piston lowering chamber side of the fourth hydraulic cylinder by a hydraulic path, and a piston lowering chamber side of the third hydraulic cylinder and a piston of the second hydraulic cylinder are connected. A lift for a vehicle, wherein the lift room is connected to a lift chamber by a hydraulic path.

According to a third aspect of the present invention, there is provided a vehicle lift in which a maintenance vehicle is raised and lowered by raising and lowering left and right lifting tables arranged in parallel. A two-stage first hydraulic cylinder including a cylinder and a lifting ram is provided, and a two-stage second hydraulic cylinder including a main cylinder, a sub-cylinder, and a lifting ram serving as a lifting means of the left lifting table is provided. On the other hand, a hydraulic path from the same hydraulic pump is connected to the piston lift chamber side of the main cylinder of the first hydraulic cylinder and the piston lift chamber side of the main cylinder of the second hydraulic cylinder, and The piston lowering chamber side of the main cylinder and the second
A hydraulic path is used to connect the piston raising chamber side of the sub cylinder of the hydraulic cylinder to the piston lowering chamber side of the main cylinder of the second hydraulic cylinder and the piston raising chamber side of the sub cylinder of the first hydraulic cylinder. A vehicle lift characterized by being connected by:

[0012]

1 and 2 show an example of a vehicle lift corresponding to the first aspect of the present invention. In the figure, reference numerals 10 and 10 denote left and right elevating tables arranged in parallel, 20 and 20 denote base frames installed on the floor and pits of a maintenance shop or the like. Are connected via the movable frames 30. Each of these lifting tables 10, 10 is provided with two corresponding front and rear movable frames 30, 30 and a base frame 20.
A link frame having a parallelogram shape is formed between the first and second frames, and the link frame is opened and closed to move up and down.

[0013] Each of the movable frames 30 is provided with 100A to 100D.
.. And the first to fourth hydraulic cylinders installed between the middle part of.
With hydraulic cylinders, these hydraulic cylinders 100A to 100A
When each piston rod 110 is extended by the drive of 0D, the left and right lifting tables 10, 10 in the closed state (the state of being in close contact with the base frames 20, 20) are raised. Of course, when the piston rods 110 are shortened, the left and right elevating tables 10, 10 in the raised state are lowered.

In the closed state, each of the elevating tables 10, 10 is brought into close contact with the movable frames 30,... Together with the base frames 20, 20, so that the height from the floor surface can be reduced. (Including an inspection vehicle, etc.) can be carried on the wheel-elevating tables 10 and 10 while traveling, and a so-called drive-on system is used. In addition, it is also possible to directly support the bottom surface side of the maintenance vehicle with the elevating tables 10, 10 by making the size of the elevating tables 10, 10 smaller.

The hydraulic pipeline system in each of the first to fourth hydraulic cylinders 100A to 100D is as shown in FIG. Hydraulic paths L from the same hydraulic pump 210 are provided on the piston lifting chamber 101 side of the first hydraulic cylinder 100A and on the piston lifting chamber 101 side of the third hydraulic cylinder 100C.
While connecting the piston lowering chamber 102 side of the first hydraulic cylinder 100A and the piston rising chamber 101 side of the fourth hydraulic cylinder 100D with a hydraulic path L,
The hydraulic cylinder 100C and the piston descending chamber 102 side and the second
The hydraulic cylinder 100B is connected to the piston lift chamber 101 side by a hydraulic path L. In other words, two hydraulic cylinders 100A to 100B installed before and after the left and right elevating tables 10, 10 and hydraulic cylinders 100C to 100C, respectively.
D is mounted so as to cross the hydraulic pipeline.

The amount of pressure medium stored on the piston 111 of the first hydraulic cylinder 100A and the fourth hydraulic cylinder 1
00D is set to be the same as the pressure medium capacity below the piston 111, and the third hydraulic cylinder 100
The pressure medium capacity on the piston 111 of C and the pressure medium capacity under the piston 111 of the second hydraulic cylinder 100B are set to be the same. The second hydraulic cylinder 100B
Of the piston lowering chamber 102 and the fourth hydraulic cylinder 100D
On the side of the piston descending chamber 102, the pressure medium (oil) is emptied or a state in which the pressure medium can enter and exit appropriately.

The hydraulic pump 210 is driven by a drive source 220 such as a motor. In the hydraulic path L, a check valve (check valve) for preventing the pressure medium from returning to the hydraulic pump side is provided. ) 230, a safety valve 240 for adjusting and controlling the supply pressure of the pressure medium, and a drive valve for discharging the pressure medium driven when the piston rod 110 of each of the first to fourth hydraulic cylinders 100A to 100D is lowered. Lowering valve 250 composed of a solenoid valve or the like
Is incorporated.

Therefore, in the vehicle lift of the present invention having the above-described structure, when each of the lift tables 10, 10 is lifted, first, for example, from the direction of the arrow X shown in FIG. The maintenance vehicle is loaded on the wheel 10 by the drive-on method with each wheel. Next, in this state, the drive source 220 is driven to discharge the pressure medium from the hydraulic pump 210. Then, the pressure medium is pressure-fed to the piston lifting chamber 101 side of the first hydraulic cylinder 100A and the piston lifting chamber 101 side of the third hydraulic cylinder 100C.

By the pressure feeding of the pressure medium, the piston rod 110 and the piston 1 of the first hydraulic cylinder 100A are moved.
11 rises and correspondingly, the piston descending chamber 1
When the pressure medium on the 02 side is pressure-fed to the piston rising chamber 101 side of the fourth hydraulic cylinder 100D, while the piston rod 110 and the piston 111 of the third hydraulic cylinder 100C rise, correspondingly, the piston descending chamber 102 side Of the second hydraulic cylinder 100B is also pressure-fed to the piston lifting chamber 101 side of the second hydraulic cylinder 100B.

For this reason, if there is no eccentric load such as left, right, front and rear, in each of the lifting tables 10, 10 in a state where the maintenance vehicle is loaded and placed, the respective lifting tables 10, 10
Is raised almost equally in the front, rear, left and right directions, and a stable rise is secured.

On the other hand, in the case of the vehicle lift of the present invention, for example, in each of the lifting tables 10 and 10 in FIG.
If the right side (front side in the figure) from the carrying direction of the maintenance vehicle has a heavy eccentric load, the lifting table 10 on the lighter left side
The piston rod 110 of the third hydraulic cylinder 100C attempts to rise first.

However, the third hydraulic cylinder 100C
When the piston rod 110 of the second hydraulic cylinder 100B communicates with the piston rod 110, the piston rod 110 of the second hydraulic cylinder 100B also attempts to rise by the same stroke. When the piston rod 110 of the second hydraulic cylinder 100B attempts to ascend, the lifting force acts on the side of the lifting table 10 on the right side of the heavier one in FIG. Rod 110
And the fourth hydraulic cylinder 100D communicating therewith also rises, and as a result, all the hydraulic cylinders 100A to 100D are hydraulically tuned, and each of the lifting tables 10, 10 is also moved back and forth, left and right. It is raised almost evenly, and a stable rise is secured.

In order to lower the lift tables 10 from the raised state, the lowering valve 250
Is appropriately opened, the pressure medium is discharged from the piston lifting chamber 101 side of the first hydraulic cylinder 100A and the piston lifting chamber 101 side of the third hydraulic cylinder 100C, and the piston lift of the fourth hydraulic cylinder 100D communicated therewith. Each of the lift tables 1 is discharged from the chamber 101 side and the piston lift chamber 101 side of the second hydraulic cylinder 100B.
0,10 falls.

FIGS. 3 to 5 show an example of a vehicle lift corresponding to the second aspect of the present invention. In the figure, 10 and 10 are left and right elevating tables arranged in parallel, and 20 and 20 are base frames installed on a floor surface or a pit portion of a maintenance shop or the like, which are assembled in an X shape before and after each. Are connected by a plurality of linked frames 40. Each of these lifting tables 10 is opened and closed by opening and closing the corresponding plurality of linked frames 40.
It goes up and down.

Each of 100A to 100D is a base frame 2
The first to fourth hydraulic cylinders, two of which are respectively installed between the hydraulic cylinders 100A to 100A and the intermediate parts of the link-shaped frames 40,.
When the respective piston rods 110 are extended by the drive of 00D, the piston rods 110 are closed (the base frames 20, 20).
Left and right elevating tables 10 and 10
Is rising. Of course, when the piston rods 110 are shortened, the left and right elevating tables 10, 10 in the raised state are lowered.

In the closed state, each of the elevating tables 10, 10 is closely attached to the base frames 20, 20 together with the link-shaped frames 40,... It is compact and compact. In each of the lifting tables 10, 10, the maintenance vehicle (including the inspection vehicle, etc.) which has been carried in is supported and lifted by supporting the bottom surface. Of course, while the maintenance vehicle is running,
It is also possible to adopt a so-called drive-on method in which the data is carried on the 0 and 10.

FIG. 5 shows a hydraulic pipeline system in each of the first to fourth hydraulic cylinders 100A to 100D. Hydraulic paths L from the same hydraulic pump 210 are provided on the piston lifting chamber 101 side of the first hydraulic cylinder 100A and on the piston lifting chamber 101 side of the third hydraulic cylinder 100C.
While connecting the piston lowering chamber 102 side of the first hydraulic cylinder 100A and the piston rising chamber 101 side of the fourth hydraulic cylinder 100D with a hydraulic path L,
The hydraulic cylinder 100C and the piston descending chamber 102 side and the second
The hydraulic cylinder 100B is connected to the piston lift chamber 101 side by a hydraulic path L. That is, two hydraulic cylinders 100A to 100B installed at substantially the same position on the left and right lifting tables 10, 10 and the hydraulic cylinder 100C
-100D are attached in a cross shape in terms of hydraulic pipeline. The rest of the configuration is substantially the same as that of FIG.

Therefore, in the vehicle lift of the present invention having the above-described structure, when each of the lift tables 10, 10 is lifted, first, for example, from the direction of arrow X shown in FIG. 10, a maintenance vehicle is carried in, and a predetermined bottom side of the
Position on 0,10. Next, in this state, the driving source 2
20 is driven to discharge the pressure medium from the hydraulic pump 210. Then, the pressure medium is pressure-fed to the piston lifting chamber 101 side of the first hydraulic cylinder 100A and the piston lifting chamber 101 side of the third hydraulic cylinder 100C.

[0029] By the pressure feeding of the pressure medium, the piston rod 110 and the piston 1 of the first hydraulic cylinder 100A are moved.
11 rises and correspondingly, the piston descending chamber 1
When the pressure medium on the 02 side is pressure-fed to the piston rising chamber 101 side of the fourth hydraulic cylinder 100D, while the piston rod 110 and the piston 111 of the third hydraulic cylinder 100C rise, correspondingly, the piston descending chamber 102 side Of the second hydraulic cylinder 100B is also pressure-fed to the piston lifting chamber 101 side of the second hydraulic cylinder 100B.

For this reason, if there is no eccentric load such as left, right, front and rear, in each of the lifting tables 10, 10 in a state where the maintenance vehicle is carried in and placed, the respective lifting tables 10, 10
Is raised almost equally in the front, rear, left and right directions, and a stable rise is secured.

On the other hand, in the case of the vehicle lift of the present invention, for example, in each of the lifting tables 10 and 10 in FIG.
If the right side (front side in the figure) from the carrying direction of the maintenance vehicle has a heavy eccentric load, the lifting table 10 on the lighter left side
The piston rod 110 of the third hydraulic cylinder 100C attempts to rise first.

However, the third hydraulic cylinder 100C
When the piston rod 110 of the second hydraulic cylinder 100B communicates with the piston rod 110, the piston rod 110 of the second hydraulic cylinder 100B also attempts to rise by the same stroke. When the piston rod 110 of the second hydraulic cylinder 100B attempts to ascend, the ascending force acts on the side of the heavier right-hand elevating table 10 in FIG. 4, so that the piston rod 110 of the first hydraulic cylinder 100A is interlocked with this. Rod 110
As well as the fourth hydraulic cylinder 100D communicating therewith is also raised. As a result, all the hydraulic cylinders 100A to 100D are hydraulically tuned, and each of the lifting tables 10, 10 is also moved back and forth, left and right. It is raised almost evenly, and a stable rise is secured.

Of course, each of the lifting tables 10, 10
In order to lower from the raised state, the lowering valve 25
0 is appropriately opened, the pressure medium becomes the first hydraulic cylinder 100A.
Piston lift chamber 101 side and the third hydraulic cylinder 100C
Are discharged from the piston lift chamber 101 side of the fourth hydraulic cylinder 100D and the piston lift chamber 101 side of the second hydraulic cylinder 100B which are communicated with them. 1
0,10 falls.

FIGS. 6 and 7 show an example of a vehicle lift corresponding to the third aspect of the present invention. In the figure, 10 and 10 denote left and right elevating tables arranged in parallel, and 300A and 300B denote first and second hydraulic cylinders for moving up and down these elevating tables 10 and 10, respectively.
Each of these hydraulic cylinders 300A, 3
00B is buried vertically below the floor of a maintenance shop or the like through the outer cylinders 50, 50, for example.
A flange-shaped horizontal plate 51, 51 which is substantially flush with the floor surface, is attached to the upper end of the zero.

The first hydraulic cylinder and the second hydraulic cylinder 300A, 300B
, A sub-cylinder 320 and an elevating ram 330.
When each of the lifting rams 330, 330 is extended by the drive of 0B, the left and right lifting tables 10, 10 in the closed state (the state of being in close contact with the horizontal plates 51, 51) are raised. . Of course, when the lifting rams 330, 330 are shortened, the left and right lifting tables 10, 10 in the raised state are lowered.
In actual installation, although not shown, it is hung from the lifting table 10 to the outer periphery of the main cylinder 310,
A long guide tube (guide ram) that moves up and down in conjunction with the elevating table 10 may be hung down. Thereby, the safety of the worker can be ensured, and the intrusion of dust and the like into the inside of the apparatus can be effectively prevented.

The hydraulic pipeline system in each of the first and second hydraulic cylinders 300A to 300D is as shown in FIG. The piston lift chamber 311 side of the main cylinder 310 of the first hydraulic cylinder 300A and the piston lift chamber 31 of the main cylinder 310 of the second hydraulic cylinder 300B
On the other hand, the hydraulic path L from the same hydraulic pump 210 is connected to the first hydraulic cylinder 300A, while the piston descending chamber 312 side of the main cylinder 310 of the first hydraulic cylinder 300A and the second hydraulic cylinder 3
The hydraulic cylinder L is connected to the piston lift chamber 321 side of the sub cylinder 320 of the second hydraulic cylinder 3B.
00B piston lowering chamber 312 of main cylinder 310
The side and the piston lift chamber 321 side of the sub cylinder 320 of the first hydraulic cylinder 300A are connected by a hydraulic path L. In other words, in the two hydraulic cylinders 300A to 300B installed substantially at the center of the left and right elevating tables 10, 10, the respective sub cylinders 320, 320 are respectively connected to the respective main cylinders 310, 310 by a hydraulic pipeline. Is attached in a cross shape.

The pressure medium capacity on the piston 313 of the main cylinder 310 of the first hydraulic cylinder 300A and the pressure medium capacity on the sub-cylinder 320 side of the second hydraulic cylinder 300B are set to be the same, and similarly. The main cylinder 310 of the second hydraulic cylinder 100B
Of the pressure medium on the piston 313 and the pressure medium on the sub-cylinder 320 side of the first hydraulic cylinder 300A are set to be the same. The rest of the configuration is substantially the same as that of FIG.

Therefore, in the vehicle lift of the present invention having the above-described structure, when each of the lift tables 10, 10 is lifted, first, the lift table 10, 10, which is lowered from, for example, the arrow X direction shown in FIG. The maintenance vehicle is carried in on the lift 10, and a predetermined bottom surface thereof is positioned on each of the lift tables 10, 10. Next, in this state, the drive source 220 is driven to discharge the pressure medium from the hydraulic pump 210. Then, the pressure medium is pumped to the piston rising chamber 311 side of the main cylinder 310 of the first hydraulic cylinder 300A and the piston rising chamber 311 side of the main cylinder 310 of the second hydraulic cylinder 300B.

The sub cylinder 320 of the first hydraulic cylinder 300A and the piston 31
3 rises, the main cylinder 31
The pressure medium on the side of the piston lowering chamber 312 is the piston raising chamber 3 of the sub-cylinder 320 of the second hydraulic cylinder 300B.
When the sub-cylinder 320 and the piston 313 of the second hydraulic cylinder 300B rise while being pressure-fed to the 21 side,
Correspondingly, the pressure medium on the piston lowering chamber 312 side of the main cylinder 310 is also pressure-fed to the piston raising chamber 321 side of the sub cylinder 320 of the first hydraulic cylinder 300B.

Therefore, if there is no uneven load such as left and right, front and rear, in each of the lifting tables 10, 10 in a state where the maintenance vehicle is carried in and placed, the respective lifting tables 10, 10
Is raised almost equally in the front, rear, left and right directions, and a stable rise is secured.

On the other hand, in the case of the vehicle lift of the present invention, for example, in each of the lifting tables 10 and 10 in FIG.
If the right side (front side in the figure) from the carrying direction of the maintenance vehicle has a heavy eccentric load, the lifting table 10 on the lighter left side
The sub-cylinder 320 and the piston 313 of the second hydraulic cylinder 300B try to rise first.

However, the second hydraulic cylinder 300B
When the sub-cylinder 320 and piston 313 of the second hydraulic cylinder 300B attempt to ascend, the elevating ram 330 of the first hydraulic cylinder 300A, which is in communication with the piston descending chamber 312 side of the main cylinder 310 of the second hydraulic cylinder 300B, also attempts to ascend. The lifting ram 3 of the first hydraulic cylinder 300A
When the sub-cylinder 30 of the first hydraulic cylinder 100A is moved upward, the lifting force acts on the heavier right-hand lifting table 10 side in FIG.
20 and the piston 313 are also raised, and furthermore, the second hydraulic cylinder 30 communicated with the piston descending chamber 312 side of the main cylinder 310 of the first hydraulic cylinder 300A.
The lifting ram 330 of 0B is also raised, as a result, all the hydraulic cylinders 300A to 300B are hydraulically synchronized, and the lifting tables 10, 10 are also raised almost equally in the front, rear, left and right, and a stable lift is secured. You.

In order to lower each of the lifting tables 10 from the raised state, the lowering valve 250 is used.
Is appropriately opened, the pressure medium is moved from the piston rising chamber 311 side of the main cylinder 310 of the first hydraulic cylinder 300A to the second hydraulic cylinder 300A.
The hydraulic cylinder 300B is discharged from the piston raising chamber 311 side of the main cylinder 310 and the piston raising chamber 321 side of the sub-cylinder 320 of the second hydraulic cylinder 300B communicated with the piston lowering chamber 312 side of each main cylinder 310. Is discharged from the piston lift chamber 321 side of the sub-cylinder 320 of the first hydraulic cylinder 300A, so that each of the lift tables 10, 10 is lowered.

In the above-described embodiment, the case where the present invention is applied to three types of vehicle lifts has been described. However, the present invention is not limited to this, and is applicable to other types of vehicle lifts having similar problems. It is also possible to apply.

[0045]

As is apparent from the above description, the vehicle lift device according to the present invention has the following excellent effects.

(1) First, the left and right elevating tables arranged in parallel are connected hydraulically to each other by crossing a hydraulic pipeline system, so that no mechanical coupling structure is required. And the manufacturing cost can be reduced.

(2) In the case of hydraulic tuning in which the hydraulic pipe system is connected to the left and right elevating tables arranged in parallel as described above, the length of the left and right pipes and the cylinder By simply adjusting the oil volume to the same value, it is possible to suppress the out-of-synchronization caused by oil compression or expansion of the pipe hose, and control with high accuracy is possible. As described above, the hydraulic tuning does not require high-precision manufacturing or assembly unlike a mechanical coupling structure, so that the manufacturing cost can be reduced from this point as well.

(3) When the right and left elevating tables arranged in parallel are hydraulically synchronized by connecting a hydraulic pipeline system, even if an unbalanced load is generated between the left and right elevating tables, each of the right and left elevating tables can be easily adjusted. Since the hydraulic cylinders are synchronized, stable ascent and descent are always guaranteed, and high safety is obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a vehicle lift according to the present invention.

FIG. 2 is a schematic explanatory view showing an example of a hydraulic pipeline system in the vehicle lift of FIG. 1;

FIG. 3 is a side view showing another example of the vehicle lift according to the present invention.

FIG. 4 is a plan view showing the vehicle lift shown in FIG. 3;

FIG. 5 is a schematic explanatory view showing an example of a hydraulic pipeline system in the vehicle lift of FIG. 3;

FIG. 6 is a perspective view showing another example of the vehicle lift according to the present invention.

FIG. 7 is a schematic explanatory view showing an example of a hydraulic pipeline system in the vehicle lift of FIG. 6;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 Elevating table 20 Base frame 30 Movable frame 40 Linked frame 100A-100D 1st hydraulic cylinder-4th hydraulic cylinder 110 Piston rod 210 Hydraulic pump 220 Drive source 250 Lowering valve 300A-300B 1st hydraulic cylinder-2nd hydraulic cylinder 310 Main cylinder 320 Sub cylinder 330 Elevating ram

Claims (3)

[Claims] 1. A vehicle lift in which a maintenance vehicle is raised and lowered by raising and lowering left and right lifting tables arranged in parallel, wherein a first hydraulic cylinder and a second hydraulic cylinder are provided on the front and rear bottom surfaces of the right lifting table. At the same time, the third hydraulic cylinder and the fourth hydraulic cylinder
While installing a hydraulic cylinder, a hydraulic path from the same hydraulic pump is connected to the piston raising chamber side of the first hydraulic cylinder and the piston raising chamber side of the third hydraulic cylinder, and the piston of the first hydraulic cylinder The descending chamber side is connected to the piston rising chamber side of the fourth hydraulic cylinder by a hydraulic path, and the piston descending chamber side of the third hydraulic cylinder is connected to the piston rising chamber side of the second hydraulic cylinder by a hydraulic path. A vehicle lift characterized by the following. 2. A vehicle lift in which a maintenance vehicle is raised and lowered by raising and lowering left and right lifting tables arranged in parallel, wherein a first hydraulic cylinder and a second hydraulic cylinder serving as lifting means of the right lifting table are the same. At the same time
A third hydraulic cylinder and a fourth hydraulic cylinder, which serve as elevating means of the left elevating table, are installed at the same location, while the same piston lift chamber side of the first hydraulic cylinder and the same piston lift chamber side of the third hydraulic cylinder. A hydraulic path from the hydraulic pump is connected, and a piston lowering chamber side of the first hydraulic cylinder and a piston raising chamber side of the fourth hydraulic cylinder are connected by a hydraulic path, and a piston of the third hydraulic cylinder is connected. A lift for a vehicle, wherein a lowering chamber side and a piston raising chamber side of the second hydraulic cylinder are connected by a hydraulic path. 3. A vehicle lift in which a maintenance vehicle is raised and lowered by raising and lowering left and right lifting tables arranged in parallel, comprising a main cylinder, a sub-cylinder, and a lifting ram serving as lifting means for the right lifting table. A two-stage first hydraulic cylinder is provided, and a two-stage second hydraulic cylinder including a main cylinder, a sub-cylinder and an elevating ram serving as elevating means for the left elevating table is provided, while the first hydraulic cylinder is provided. A hydraulic path from the same hydraulic pump is connected to the piston rising chamber side of the main cylinder of the first hydraulic cylinder and the piston rising chamber side of the main cylinder of the second hydraulic cylinder, and the piston lowering chamber side of the main cylinder of the first hydraulic cylinder And a hydraulic path for connecting the piston lift chamber side of the sub-cylinder of the second hydraulic cylinder to the second hydraulic cylinder.
A vehicle lift wherein a piston lowering chamber side of a main cylinder of the hydraulic cylinder and a piston raising chamber side of a sub cylinder of the first hydraulic cylinder are connected by a hydraulic path.