JPH10330093A - Lift for vehicle maintenance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To hold a cover table stopped in the upper limit position regardless of the size of the load applied. SOLUTION: When a car placing table L1 starts elevating, an elevating/ sinking means 2 moves a cover table 1 interlockingly toward the upper limit position, and at reaching there, a locking means 3 is actuated so as to hold the cover table 1 in the upper limit position, and opposite thereto the car placing table L1 starts sinking so that a disengaging means 4 disengages the locking means 3 interlockingly, and thereafter the cover table 1 is moved down by the elevating/sinking means 2 toward the lower limit position.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle maintenance lift for lifting a vehicle for performing inspection and maintenance of an automobile. More specifically, a pit for storing a part of the lift body is recessed in the floor when the vehicle-mounted table on which the vehicle is mounted is lowered, and this pit is opened when the vehicle-mounted table is lifted. About lift.

[0002]

2. Description of the Related Art Conventionally, as a vehicle maintenance lift of this type, there is a lift described in Japanese Patent Application No. 8-204978 filed by the present applicant. In this device, a cover table is provided in the pit so as to be movable in the vertical direction. From the lower surface of the cover table to the bottom surface of the pit, the elasticity is compressed as the on-vehicle table is lowered and extended with the rise of the receiving table. The body is lowered, and the load is applied to the cover table, and the load is applied to the cover table, thereby compressing the elastic body and automatically lowering the cover table. Conversely, the vehicle mount is raised and applied to the cover table. When the applied load is removed, the elastic body is extended to move the cover table upward, and the upper surface thereof is maintained substantially flush with the floor surface.

[0003]

However, in such a conventional vehicle maintenance lift, the elastic body is compressed in the vertical direction only when a load exceeding a set value is applied to the cover table in accordance with the lowering of the vehicle mount. Due to the deformation, even when a load equal to or more than the set weight such as an engine is applied on the cover table irrespective of the lowering of the vehicle-mounted base, the elastic body is compressed and deformed, and the cover table sinks, and Not only is it inferior in safety due to the difference in level between the cover table and its surrounding floor, but also it is difficult to access maintenance machines with tool wheels and other moving wheels under the lifted vehicle. There is a problem that it is also poor. Furthermore, when a plurality of coil springs are interposed in parallel from the lower surface of the cover table to the bottom of the pit, or when an air spring in which compressed air is inserted in a lantern-shaped rubber cylinder is interposed, If a heavy object exceeding the setting is concentrated on only one end portion of the cover table, only the load portion moves down and the cover table is inclined, resulting in poor safety. Also,
In particular, when the elastic body is a coil spring that expands and contracts in the vertical direction, if the elastic body is long in the axial direction with a large spring force in order to prevent the cover table from sinking, the vertical dimension of the entire device is also reduced. It is necessary to increase the distance between the bottom surface of the cover table and the bottom surface of the pit due to the increase in size, and there is a problem that the embedding work of the device is troublesome.

An object of the present invention is to stop and hold a cover table at an upper limit position regardless of the magnitude of a load. Claim 2
The invention described in addition to the object of the invention described in claim 1,
An object of the present invention is to cover a pit substantially flush with a floor surface by moving a cover table up and down without tilting without using power as the vehicle mount moves up and down. The third aspect of the present invention has the object of preventing the vertical dimension from being largely changed according to the adjustment of the spring force of the coil spring, in addition to the object of the first or second aspect of the invention.

[0005]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, there is provided a cover table supported in a pit so as to be reciprocally movable up and down and a cover table. Raising and lowering the cover table to the upper limit position where the upper surface of the cover table is substantially flush with the floor surface with the rise of the vehicle mount, and lowering the cover table to the lower limit position with the lowering of the vehicle mount Means, actuated when the cover table is moved up to the upper limit position by the lifting / lowering means, a lock means for holding the cover table at the upper limit position, and releasing the lock means with the lowering of the vehicle-mounted base, Releasing means for lowering the cover table toward the lower limit position by the elevating means. Furthermore, the invention according to claim 2 is
The invention according to claim 1, wherein the elevating means is interposed from at least one side end of the lower surface of the cover table to the bottom surface of the pit, and a direction in which the cover table moves up the link mechanism. And an elastic body that is elastically deformable in the opposite direction when the cover table is elastically pressed and a load more than the set load is applied to the cover table. According to a third aspect of the present invention, in the configuration of the first or second aspect, the link mechanism is formed in an X-shape that is vertically expandable and contractable, and the elastic body is provided laterally on the X-type link mechanism. It is characterized by adding a configuration that is a coil spring that expands and contracts.

[0006]

According to the first aspect of the present invention, when the on-vehicle table starts to rise, the lifting means moves the cover table toward the upper limit position in conjunction therewith, and when the cover table reaches the upper limit position. The locking means is operated to hold the cover table at the upper limit position, and conversely, when the vehicle-mounted table starts to descend, the releasing means releases the locking means in conjunction with this, and thereafter, the lifting / lowering The cover table is moved downward to the lower limit position by the means. Further, according to a second aspect of the present invention, in addition to the configuration of the first aspect, a link mechanism in which the lifting / lowering means is interposed from at least one side end of the lower surface of the cover table to the bottom surface of the pit, and the link mechanism is provided. Is elastically pressed in the direction in which the cover table moves upward and an elastic body that can be deformed in the opposite direction when a load greater than the setting is applied to the cover table has been added. As a result, the elastic body presses the link mechanism to move the cover table upward, and conversely, the vehicle base is lowered and a load more than the set load is applied to the cover table, so that the elastic body is deformed in the opposite direction. The cover table moves down. According to a third aspect of the present invention, in the configuration according to the first or second aspect, the link mechanism is formed in an X-shape which is vertically expandable and contractible, and the elastic body extends in a lateral direction in which the elastic body is laterally provided on the X-link mechanism. Since the configuration of a coil spring that expands and contracts is added, the elastic coil spring compresses and deforms in the horizontal direction, pushing the X-link mechanism and moving the cover table upward. Hangs on the cover table, whereby the coil spring of the elastic body expands and deforms in the lateral direction via the X-type link mechanism.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment shows a case where the entire lift main body L is buried under the floor F as shown in FIGS. 1 to 3, and this lift main body L moves up and down in opposition to both left and right wheels of the vehicle. A pair of left and right moving parallel vehicle mounts L1,
For example, the vehicle mounts L1 and L1 may be mounted on a vehicle having a frame structure such as an RV, a one-box or a small truck.
A pair of pit lifts L before and after driving up and down in order to further lift up from above and enable freewheel work
2 and L2, and the pit lifts L2 and L2 are movably mounted in the front-rear direction between the vehicle mounts L1 and L1. Correspondingly, a pair of left and right parallel vehicle-mounting pits P1, in which the most lowered vehicle-mounted units L1, L1 are stored, are provided as pits P for storing the entirety of the lift main body L on the floor surface F. P1, the pit lift L2,
A lift pit P2 in which L2 is stored is continuously formed, and a cover table 1 slightly smaller than the upper end opening is provided inside the lift pit P2 so as to be movable in the vertical direction. In the case of the illustrated example, as shown in FIG. 3, a flat rectangular lift pit P2 for storing the pit lifts L2 and L2 in a state of being moved toward one of the front and rear of the vehicle mounts L1 and L1 is provided. By recessing one pit P1, P1 at one end in the front-rear direction, the pit P is continuously formed in a U-shape, and the cover table 1 slightly smaller than the upper end opening of the lift pit P2 is provided. Although it is shown by a solid line, if necessary, as shown by a two-dot chain line, the lift pit P2 is separated from the on-vehicle pits P1, P
A cover table 1 ′ that protrudes to one of the front and rear end portions 1 may be provided.

[0008] Between a lower surface of the cover table 1 and a bottom surface of the lift pit P2, a lifting means 2 described later is provided.
The operation of the elevating means 2 causes the on-vehicle table L1
The cover table 1 is moved upward to the upper limit position where the upper surface 1a thereof is substantially flush with the floor surface F with the rise, and the cover table 1 is moved downward to the lower limit position with the lowering of the on-board stand L1. Move.

The elevating means 2 includes the cover table 1
Lift pits P2 from both sides of at least one direction in the lower surface
A link mechanism 2a that expands and contracts in the vertical direction is interposed over the bottom surface of the cover table 1. The link mechanism 2a is extended and elastically pressed in the direction in which the cover table 1 moves upward and set. When the above load is applied to the cover table 1, an elastic body 2b that can be deformed in the opposite direction is provided.

The link mechanism 2a is provided as shown in FIGS.
The two arms are pivoted about the middle part in the axial direction.
It is configured as an X type that can be stretched vertically
Then, two sets of X type along the left and right side edges of the cover table 1.
Link mechanisms 2a, 2a are provided. Each type of phosphorus
The lock mechanism 2a has one arm 2a₁The top of
Attached to the lower corner of the cover table 1 so that it can swing freely
And one arm 2a₁The lower end of the lift pit P
Arm 2a with respect to the lower corner of₁Move in the axial direction of
The other arm 2a_TwoThe top of
The arm 2 a_Twoof
The other arm 2a is movably contacted in the axial direction. _Twoof
The lower end is pivotally attached to the bottom of the pit P
As a result, the cover table 1 is
These arms 2a are connected to the bottom so as to be movable up and down.
₁, 2a_TwoThe elastic body 2b is provided horizontally between them. In the example shown
Is each arm 2a₁, 2a_TwoShaft attaching part 2a_ThreeOn the side
Subsurface link 2a_Four, 2a_FourThe front and back pair
Auxiliary link 2a before and after these_Four, 2a_FourLeft and right
Swing support shaft 2a extending in the direction_Five, 2a_FiveElastic body 2 over
b is provided horizontally.

[0011] The elastic body 2b is provided with the on-board units L1 and L1.
Deformation is shortened by the load due to the descent of
This is a compression coil spring.
Auxiliary link 2a_Four, 2a_FourSwing support shaft 2a_Five, 2a_Five
By elastically pulling them toward each other.
To extend the X-type link mechanisms 2a, 2a in the vertical direction.
However, conversely, a load exceeding the set value is applied via the cover table 1.
The X-type link mechanisms 2a, 2a
The X-link mechanism 2a, 2a moves up and down
Compressed. Further, the auxiliary link 2a_Four, 2a_Four
Swing support shaft 2a_Five, 2a_FiveHas a movement regulation guide 2a
₆Is traversed in the front-rear direction, and the swing support
Spindle 2a _Five, 2a_FiveX type by regulating the interval of
The range of expansion and contraction of the link mechanisms 2a, 2a in the vertical direction,
The upper limit position and the lower limit position of the bar table 1 are determined. Ma
If necessary, the bottom of the lift pit P2
At the lower limit position of the bar table 1, a strike
Upper 2a₇May be erected.

The lift pit P2 is provided with a lock means 3 which is activated when the elevating means 2 moves the cover table 1 up to the upper limit position to hold the cover table 1 at the upper limit position. Release means 4 is provided for releasing the lock means 3 as the on-vehicle tables L1 and L1 are lowered, and for enabling the cover table 1 to move down to the lower limit position by the elevating means 2.

The lock means 3 is formed by an elastic body 2b.
The state in which the mold link mechanisms 2a, 2a are extended in the up-down direction,
Automatic mechanical lock independent of spring force of elastic body 2b
Is what you do. In the case of the illustrated example, each of the above-mentioned X-type links
Arm 2a constituting mechanism 2a₁, 2a _TwoShaft attaching part 2a
_ThreeLock lever that is pivotally mounted in the vertical direction with respect to
3a and the vicinity of the swing locus of the tip of the lock lever 3a.
Lock plate protruding from the bottom of the lift pit P2
3b, the X-type link mechanisms 2a, 2a
The tip of the lock lever 3a that has swung downward by its own weight with its length
By engaging the end with the lock plate 3b, the lock
The lever 3a serves as a support and the shaft attachment 2a_ThreeDo not move down
I'm trying.

The release means 4 is provided with the on-board units L1 and L1.
The mechanical lock of the X-type link mechanisms 2a, 2a by the lock means 3 is automatically released with the lowering of. In the case of the illustrated example, the bases of the lift pits P2 are supported so as to be swingable in the vertical direction with respect to the bottom surface, and the front ends face the lower surfaces of the respective vehicle mounts L1.
A release lever 4a protruding from the release lever 4a, a spring 4b for constantly swinging the distal end of the release lever 4a upward, and a release link 4c extending laterally from the base end of the release lever 4a to the bottom surface of the lift pit P2. The lower surface of each descending vehicle mount L1 abuts against the tip of the release lever 4a, swings downward against the spring 4b, and lifts the release link 4c to release the protrusion 3c protruding from the lock lever 3a. , The lock lever 3a swings in a direction away from the lock plate 3b.

On the lower surface in the front-rear direction of the on-vehicle stands L1, L1, extendable mechanisms L11, L such as a one-stage X-type link are provided.
11 as well as drive hydraulic cylinders L12, L
12 are connected to each other to control hydraulic oil supplied from a hydraulic unit (not shown) to the drive hydraulic cylinders L12, L12, so that the on-vehicle stands L1, L1 can be moved up and down in a horizontal state. L11, L11 and drive hydraulic cylinders L12, L12 are also stored in the on-board pits P1, P1 together with the on-vehicle stands L1, L1. In the illustrated example, the front and rear ends of the on-vehicle mounts L1 and L1 are respectively provided with a tire stopper or a riding plate L that partially projects onto the floor F.
13 are supported so as to be able to swing vertically.

Next, the operation of the vehicle maintenance lift will be described. First, as shown in FIG.
1, L1 in the retracted state with the most lowered
1 and L1 are respectively stored in the pits P1 and P1 for the on-vehicle stand, and the upper surface thereof is substantially flush with the floor surface F, and only the lower part or all of the pit lifts L2 and L2 are lift pits P2.
Is stored in each. As a result, the weights of the on-vehicle tables L1 and L1 and the pit lifts L2 and L2 are reduced by the cover table 1
Are held in a state of being shortened and deformed, and the cover table 1 is
2, it moves downward while being pressed against the lower surface of L2.

Then, as shown in FIG.
1, L1 is raised, and the pit lift L
2, L2 also rises, whereby the load placed on the cover table 1 is removed, so that the elastic bodies 2b of the lifting / lowering means 2 expand and deform, and the cover table 1 moves upward. In conjunction with this, the release levers 4a, 4a of the release means 4 swing upward by the spring forces of the springs 4b, 4b as shown by the two-dot chain line in FIG. When the cover table 1 moves up to the upper limit position, the upper surface 1a thereof is substantially flush with the floor surface F, and only the upper end opening of the lift pit P2 or the front and rear end portions of the on-board pits P1 and P1. Is covered by the cover table 1 substantially flush with the floor surface F.

In this upper limit state, as shown by the solid line in FIG. 1, the lock levers 3a, 3a of the lock means 3 swing by their own weights, and their ends are engaged with the lock plates 3b, 3b, respectively. , 3a provide support. Thereby, the link mechanisms 2a, 2a are automatically mechanically locked irrespective of the spring force of the elastic members 2b of the elevating means 2, and the cover table 1 remains at the upper limit position regardless of the magnitude of the load applied thereto. Stopped and held. Therefore, even if a load greater than the set weight such as an engine is applied on the cover table 1, the cover table does not sink and no step is formed between the cover table 1 and the surrounding floor F, and The working floor F located between the tables L1 and L1 and the surrounding floor F of both the on-vehicle stands L1 and L1 are flat and continuous. Maintenance equipment with mobile wheels can be easily carried under the lifted vehicle.

Conversely, when the vehicle mounts L1, L1 start to descend, their lower surfaces abut against the tips of the release levers 4a, 4a and are pushed down, and in conjunction with this, the release links 4c, 4c and The lock levers 3a, 3a are pivoted in a direction away from the lock plates 3b, 3b via the release protrusions 3c, 3c, respectively, so that their engagement is released and the mechanical lock of the link mechanisms 2a, 2a is automatically released. Is done. After that, the on-board units L1 and L1 and the pit lift L
Since the weight of L2 and L2 is applied to the cover table 1, the elastic members 2b of the elevating means 2 are shortened and deformed, and the cover table 1 is moved down to the lower limit position.

On the other hand, the one shown in FIG. 4, the one shown in FIG. 5, and the one shown in FIGS. 6 and 7 are other embodiments of the present invention, respectively.

In FIG. 4, the lift main body L has a floor surface F.
The pits P are partially stored on the floor surface F at positions opposing the pit lifts L2 and L2 as pits P for partially storing the lift main body L. Only the lift pit P3 to be stored is recessed,
The configuration in which a cover table 1 slightly smaller than the upper end opening is provided in the lift pit P3 so as to be movable in the vertical direction is different from the embodiment shown in FIGS. Is substantially the same as the embodiment shown in FIGS. In the case of the illustrated example, one flat quadrangular lift pit P3 is recessed so that the pit lifts L2, L2 are stored in a state of being moved toward one of the front and rear of the vehicle-mounted tables L1, L1. As shown in FIG.
The pit lift L which was lowered the most with the
By storing the lower ends of L2 and L2 in the lift pit P3, the upper surfaces of the vehicle-mounted stands L1 and L1 are
2 and L2, the height from the upper end of the lift main body L to the floor surface F is set to a height that allows easy entry of the vehicle.

Therefore, FIG. 4 shows a state in which the on-vehicle tables L1 and L1 are lowered most as shown in FIG. 4A, and the lower ends of the pit lifts L2 and L2 are partially stored in the lift pit P3. Is done. Then, as shown in FIG.
1, L1 is raised, and the pit lift L
2, L2 also rises, whereby the load placed on the cover table 1 is removed. As shown in FIG. 1, the elastic members 2b of the lifting / lowering means 2 expand and deform, and the cover table 1 moves upward. Release levers 4a, 4a of release means 4 in conjunction with
Also swings upward by the spring force of the springs 4b. When the cover table 1 reaches the upper limit position, its upper surface 1a is maintained substantially flush with the floor surface F, and the lift pit P
3 is covered with the cover table 1 so as to be substantially flush with the floor surface F, and is automatically mechanically locked by the lock means 3 irrespective of the spring force of the elastic members 2b. The cover table 1 is stopped and held at the upper limit position regardless of the magnitude of the load applied thereto. Conversely, when the onboard units L1 and L1 start to descend, the release means 4
Of the lock means 3 is automatically released by depressing the release levers 4a, 4a.

FIG. 5 shows a case where the entire lift main body L is buried under the floor F. This lift main body L is replaced with the pit lifts L2 and L2, and is equipped with a vehicle mount L1 and L1. The connecting beams L3 and L3 for reinforcement, which are substantially parallel to each other at both front and rear ends of L1, are mounted on the vehicle mounts L1 and L1 at their upper end surfaces.
The connecting beams L3 and L3 are stored on the floor F corresponding to both sides of the front and rear pits P1 and P1. Pits P4 and P4 are formed in a rectangular shape, and cover tables 1 and 1 slightly smaller than the upper ends of the pits P4 and P4 are provided movably in the vertical direction inside the pits P4 and P4. However, different from the embodiment shown in FIGS. 1 to 3, the configuration other than these is substantially the same as the embodiment shown in FIGS.

Therefore, in FIG. 5, in the storage state where the on-board tables L1 and L1 are lowered most as shown in FIG. 5A, the connection beams L3 and L3 are stored in the beam pits P4 and P4, respectively. Each upper surface is substantially flush with the floor surface F. Then, as shown in FIG. 1B, when the in-vehicle bases L1, L1 are raised, the connecting beams L3, L3 are also raised, and the load placed on the cover table 1 is thereby removed. The elastic members 2b of the lifting means 2, 2
b are extended and the cover tables 1, 1 are moved upward, and in conjunction with this, the release levers 4a of the release means 4, 4 also swing upward by the spring force of the springs 4b. When the cover tables 1, 1 reach the upper limit position, the respective upper surfaces 1a, 1a,
1a is maintained substantially flush with the floor surface F, and the beam pit P
4 and P4, the upper opening of the floor surface is higher than the cover table 1 and 1
, And are automatically mechanically locked by the locking means 3, irrespective of the spring force of the elastic bodies 2 b, 2 b. Is stopped and held at the upper limit position regardless of the magnitude of the load applied thereto. Conversely, on-board units L1, L
1 begins to descend, the release lever 4a of the release means 4, 4
.. Is depressed to automatically release the mechanical lock of the lock means 3, 3.

FIGS. 6 and 7 show a case where the entire lift main body L is buried under the floor F. This lift main body L is mounted on a vehicle instead of the pit lifts L2 and L2. An oil drain box L4 for storing oil extracted from the vehicle is erected between the tables L1 and L1 so as to be movable in the front-rear direction. A configuration in which a pit P5 for an oil drain box for storing is recessed, and a cover table 1 slightly smaller than an upper end opening thereof is provided inside the pit P5 for an oil drain box so as to be movable vertically. Unlike the embodiment shown in FIGS. 1 to 3, the configuration other than these is substantially the same as the embodiment shown in FIGS. In the case of the example shown in the drawing, a flat rectangular oil drain box pit P5 and a vehicle-mounted pit P1, P1 are stored so that the oil drain box L4 is stored in a state of being moved toward one of the front and rear of the vehicle-mounted tables L1 and L1.
The pits P are continuous in a U-shape in plan view by recessing one at one end in the front-rear direction.

The oil drain box L4 has a structure shown in FIG.
A valve L for extracting oil stored as shown in FIG.
41 is provided so as to protrude downward from the bottom surface.
The cover table 1 is provided with a through hole 1b through which the air flows. Further, on the bottom surface of the pit P5 for the oil drain box, a valve opening protrusion 5 is provided immediately below the through hole 1b, and the X-type link mechanisms 2a, 2a, the elastic members 2b,. 4 so that it does not interfere with
Around the valve opening projection 5, an oil drainage cylinder 6 is projected, and a discharge pipe 7 connected to a drain oil storage tank (not shown) which is continuous with the oil drainage cylinder 6 is embedded.

6 and 7, the oil drain box L4 is moved along the on-vehicle stands L1 and L1 to a position immediately below the oil discharge port of the vehicle with the on-vehicle stands L1 and L1 raised. Then, the oil is extracted from the vehicle and stored in the oil drain box L4. Thereafter, the oil drain box L4 is moved to a position immediately above the oil drain box pit P5,
1 is released, the release levers 4a, 4a of the release means 4 are released.
Is pressed down, the mechanical lock of the lock means 3 is automatically released, the lower surface of the oil drain box L4 comes into contact with the upper surface 1a of the cover table 1, and the valve L41 enters the through hole 1b. Then, when the cover table 1 moves down to near the lower limit position, the valve opening projection 5 abuts on the valve L41 and pushes open as shown in FIG. As a result, the oil contained in the oil drain box L4 flows out to the discharge pipe 7 via the drain cylinder 6, and is stored in the drain oil storage tank.

In each of the above embodiments, the on-board units L1, L1
Telescopic mechanisms L11 and L such as a one-stage X-type link
11 are connected in series, but the present invention is not limited to this.
Other structures may be used as long as at least each vehicle base L1 can be raised and lowered in a horizontal state, such as using two or more X-shaped links as 11, and the entire structure of the lift body L is also shown. However, the present invention is not limited to this, and other structures may be used as long as they can move up and down the vehicle. Further, the shape of the pit P for storing the lift body L and the disposition position and the shape of the cover table 1 are not limited to those described above, but are not shown, for example, only at the front and rear ends of the on-board pits P1 and P1, respectively. The cover tables 1 and 1 may be partially provided.

[0029]

As described above, according to the first aspect of the present invention, when the on-vehicle stand starts to rise,
In conjunction with this, the elevating means moves the cover table upward toward the upper limit position, and at the time when the cover table reaches the upper limit position, the locking means operates to hold the cover table at the upper limit position. Conversely, when the vehicle table starts to descend, the release means releases the lock means in conjunction with this, and thereafter, the cover table moves down to the lower limit position by the elevating means. The stop can be maintained at the upper limit position regardless of the size. Therefore, compared to the conventional one in which the elastic body is compressed and deformed in the vertical direction only when a load more than the setting is applied to the cover table with the lowering of the vehicle mount, for example, the load exceeding the set weight of the engine or the like is increased. Even if it falls on the cover table regardless of the descent, the cover table can be prevented from sinking and there is no step between the cover table and the surrounding floor, so it is excellent in safety and lifted It is easy to put in and take out maintenance machines with moving wheels such as tool trolleys downward, and it is also excellent in workability.

Further, according to the second aspect of the present invention, in addition to the effect of the first aspect of the present invention, when the vehicle mount rises, the elastic body presses the link mechanism to move the cover table upward. When the onboard stand descends and a load greater than the setting is applied to the cover table, the elastic body deforms in the opposite direction and the cover table moves down. The pit can be moved up and down without tilting to cover the pit almost flush with the floor. Therefore, a plurality of coil springs are interposed in parallel from the lower surface of the cover table to the bottom of the pit, or a conventional air spring in which compressed air is inserted in a lantern-shaped rubber cylinder is interposed. compared,
Even if a heavy object exceeding the setting is concentrated on only one end portion on the cover table, only the load portion can be prevented from lowering and tilting, further improving safety.

The invention according to claim 3 is the invention according to claim 1 or 2
In addition to the effect of the invention, the elastic coil spring is compressed and deformed in the lateral direction, so that the X-link mechanism is pressed and the cover table moves upward, and conversely, the load from the vehicle mount is applied to the cover table. Since the coil spring is elastically extended and deformed in the lateral direction via the X-type link mechanism, the vertical dimension is not largely changed according to the adjustment of the spring force of the coil spring. Therefore, compared to a conventional coil spring in which the elastic body expands and contracts in the vertical direction, even if a spring having a large spring force is used in the axial direction, the vertical dimension of the entire apparatus can be reduced without increasing the size. The embedding work of the device is easy.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal side view of a vehicle maintenance lift showing an embodiment of the present invention, in which a use state in which a vehicle base is raised is shown by a solid line, and a state in which the vehicle base is lowered and stored is two points. This is indicated by a chain line.

FIG. 2 is a partial cross-sectional plan view of the same.

FIG. 3 is a perspective view showing the entire vehicle maintenance lift.
(A) shows a state where the vehicle-mounted base is lowered and stored, with a part cut away, and (b) shows a use state where the vehicle-mounted base is raised.

FIG. 4 is a perspective view showing the entirety of a vehicle maintenance lift showing another embodiment of the present invention. FIG. Indicates a use state in which the vehicle base is raised.

FIG. 5 is a perspective view showing the entirety of a vehicle maintenance lift showing another embodiment of the present invention. Indicates a use state in which the vehicle base is raised.

FIG. 6 is a partial longitudinal front view of a vehicle maintenance lift showing another embodiment of the present invention, and shows a state in which a vehicle-mounted base is lowered and stored by a two-dot chain line.

FIG. 7 is a cross-sectional plan view of the same.

[Explanation of symbols]

 F Floor surface L Lift body L1 Vehicle mount P Pit 1 Cover table 1a Upper surface 2 Elevating means 2a Link mechanism 2b Elastic body 3 Locking means 4 Release means

Claims (3)

[Claims] 1. A pit (P) for storing a part of a lift body (L) is recessed in a floor (F) when a vehicle-mounted table (L1) on which a vehicle is mounted is lowered, and the pit is recessed. A cover table (1) supported in the pit (P) so as to be reciprocally movable up and down in the pit (P), wherein the cover table (1) is a vehicle maintenance lift in which (P) is opened when the vehicle mount (L1) rises. ) Is raised toward the upper limit position where the upper surface (1a) of the cover table (1) is substantially flush with the floor surface (F) with the rise of the vehicle base (L1). Elevating means (2) for lowering the cover table (1) toward the lower limit position with the downward movement of the cover table (1), and operating when the cover table (1) is moved up to the upper limit position by the elevating means (2). , A lock hand for holding the cover table (1) at the upper limit position Step (3), Release of the lock means (3) with the lowering of the vehicle-mounted table (L1), and release of the cover table (1) by the elevating means (2) so as to be able to move downward to the lower limit position. Means (4)
And a lift for vehicle maintenance. 2. A link mechanism (2) interposed from at least one side of the lower surface of the lower surface of the cover table (1) to the bottom surface of the pit (P).
a) and this link mechanism (2a) is elastically pressed in the direction in which the cover table (1) moves upward, and can be deformed in the opposite direction when a load more than the setting is applied to the cover table (1). The vehicle maintenance lift according to claim 1, further comprising a flexible elastic body (2b). 3. A coil spring in which the link mechanism (2a) is formed in an X-shape which can be vertically extended and contracted, and wherein the elastic body (2b) is provided on the X-shaped link mechanism (2a) and which expands and contracts in a lateral direction. The vehicle maintenance lift according to claim 1.