JP2000026081A - Pit cover device for movable lift device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pit cover device for a movable lift device capable of attaining safe inspection and maintenance of a large vehicle and smooth movement. SOLUTION: This movable lift device is formed so that one fixed lift 2 may be mounted on one end of an opening in a pit 1 formed in a floor surface and the other movable lift 3 may be movably-mounted along the opening, wherein respective ends 5a, 5b of a first roller chain 5 and a second roller chain 6 wound around sprockets 4a, 4b in which driving sources 8 are connected near one end and at the other end in the pit 1 are bound to the front and rear of the movable lift 3, the respective other ends 5b, 6b of the roller chains 5, 6 suspended from the sprockets 4a, 4b are hung from the above so as to be bound, and a plurality of lid elements 7 having square cross sections are connected which includes both the ends of the roller chains 5, 6 movably-engaged with both the edges of the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pit cover device for a mobile lift device which can safely inspect and maintain a large vehicle such as an automobile, especially a truck, and can move smoothly.

[0002]

2. Description of the Related Art Inspection and maintenance of large vehicles such as trucks are performed by a lift device including a fixed lift and a mobile lift. It is known that the upper surface of the pit opening where the moving lift moves has a pit cover installed to prevent people and vehicles from falling down, and that multiple cover plates overlap and expand and contract. There is a caterpillar type in which a plurality of boxes are connected.

[0003]

According to this conventional pit cover device, when a large vehicle travels on the cover plate several times, it deforms and cannot be expanded or contracted. However, the caterpillar that is connected in a loop below the pit requires a sprocket below, which complicates the structure and further complicates the maintenance work because the lifting device body of the moving lift is surrounded by the caterpillar. There was a point.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a pit cover device for a mobile lift device in which the above problems are solved, the inspection and maintenance work is safe, the lift moves smoothly, and the maintenance is easy.

[0005]

In order to achieve this object, according to the present invention, one fixed lift is provided at one end of an opening of a pit formed on a floor, and the other is moved along the opening. In a moving lift device provided with a lift so as to be movable, a sprocket having a drive source connected to the vicinity of one end and the other end of the pit is pivotally supported, and a first roller chain and a second roller chain wound around these sprockets. Are connected to the first and second roller chains with a large number of lids each having a rectangular cross section whose both ends are movably engaged with both side edges of the opening. It is characterized by the following.

[0006]

FIG. 1 shows a first embodiment of the present invention.
3 to FIG.

1 is a pit formed on the floor, 2 is a fixed lift, 3 is a moving lift, the fixed lift 2 is fixed to the front end of the pit 1, and the fixed lift 2 is the pit 1 The moving lift 3 is fixed to the front end in FIG.
The wheels 3d are supported on both sides as shown in FIG.
d can move in the front-rear direction of the pit 1 by rolling in a groove 1a formed in the upper part of the inner surface of the pit 1.

2a, 3a are hydraulic cylinders of the lifts 2, 3; 2b, 3b are bearings for the lifts 2, 3; 2c, 3c are hydraulic drive units of the lifts 2, 3; Reference numeral 4b denotes first and second sprockets. The first sprocket 4a is supported by an upper portion of an inner surface near a front end portion in the pit 1, and the second sprocket 4a
The shaft b is supported at the rear end in the pit 1. These sprockets 4a and 4b are connected to first and second motors 8a and 8b with a speed reducer, which are driving sources, by means such as chain transmission.

Reference numerals 5 and 6 denote first and second roller chains. The first roller chain 5 is connected to the first sprocket 4.
a and one end 5a is fastened to the front surface of the moving lift 3 and the other end 5b of the first roller chain 5 hanging from the first sprocket 4a is lifted up. The second roller chain 6 is connected to a lower portion of a mount of the first motor 8a with a speed reducer.
It is wound around the sprocket 4b and has one end 6a.
The other end 6b of the second roller chain 6 hanging from the second sprocket 4b is also lifted and connected to the lower part of the mounting base of the second motor with reduction gear 8b. Is being worn.

Reference numeral 7 denotes a lid unit. The lid unit 7 is formed of a strong box-like body having a rectangular cross section, and is connected to the first roller chain 5 and the second roller chain 6 continuously before and after the moving lift 3. A large number are connected over a predetermined length, and are continuous to a length that can cover the opening when the moving lift 3 is located at one of the front and rear moving ends.

Further, both ends of the pit 1 are guided by the guide plates 9 and 9 to the lid 7 alone, and the upper portions thereof are covered with gap plates 10 and 10 for protection.

When the lid 7 is located at the opening of the pit 1, the lid 7 is slidably engaged with engagement grooves formed on both side edges of the opening of the pit 1 at both ends, and the upper portion thereof is moved upward. It is designed to support the weight of a passing vehicle or the like.

Next, the operation of the first embodiment will be described.

When the moving lift 3 is moved backward from the position near the front end in FIG. 1 as indicated by the arrow A, the first and second motors 8a, 8b of the driving source are simultaneously operated in the same direction. When the first and second sprockets 4a and 4b are simultaneously rotated clockwise, the second roller chain 6 pulls and moves the moving lift 3, and the first roller chain 5 moves so as to be sent out to the first sprocket 4a. The movable lift 3 is moved to a desired position behind the pit 1, that is, a lift point position behind a large vehicle. When stopping, the motors 8a and 8b are stopped at the same time.

On the other hand, when the motor is to be moved forward, the motors 8a and 8b are rotated in reverse, so that the first and second sprockets 4 are moved.
a, 4b are rotated counterclockwise.

When moving backward, the moving lift 3
A large number of lids 7 existing in the pit 1 on the front side of the moving lift 3 also move upward together with the first roller chain 5 to cover the opening of the pit 1 and a large number of lids 7 on the rear side of the moving lift 3. Moves into the pit 1 together with the second roller chain 6, and the other end 6b is lifted, so that the lid 7 hanging down in a V-shape does not contact the lower surface in the pit 1 and becomes dirty. Absent.

Thereafter, the large vehicle is lifted by supporting the front portion of the large vehicle with the support 2b of the fixed lift 2 and the rear portion of the large vehicle with the support 3b of the movable lift 3.

Then, the large vehicle is inspected and maintained. At this time, since the opening of the pit 1 is covered with a large number of lids 7, the inspection work can be performed safely. Then lifts 2, 3
When the large vehicle is moved to another place by descending, the cover unit 7 that covers the vehicle is safe and can be used for a long period of time without deformation even when the vehicle runs on the opening.

Further, as described above, the first and second sprockets 4
a and 4b operate synchronously, so that the movement of the moving lift 3 and the lid unit 7 covering the opening can be smoothly performed without a time difference depending on the moving direction. Also, since the lower part inside the pit 1 is arranged, workability is good, and the lid unit 7 does not come into contact with the bottom surface and is not stained.

Next, a second embodiment of the present invention will be described. In this embodiment, one of the first and second sprockets 4a and 4b is driven in accordance with the moving direction of the moving lift 3. Then, the other sprocket is driven.

That is, in FIG. 1, when moving the moving lift 3 on the front side backward, the second sprocket 4
Only the second motor with speed reducer 8b is driven so that b rotates clockwise, and the second roller chain 6 pulls the moving lift 3 to move.

Conversely, when moving forward, only the first motor with speed reducer 8a is driven so that the first sprocket 4a rotates counterclockwise, and the first roller chain 5 pulls and moves the moving lift 3. .

Here, a clutch such as a one-way clutch or a torque limiter is interposed between the driving source and the sprocket 4, and the interposed clutch is connected to the driving sprocket and to the driven sprocket which is not driven. The intervening clutch is operated in a non-connected state, and the driven sprocket rotates following the driving sprocket. The roller chains 5 and 6 and the lid 7 hanging from the sprocket 4 function as a back tension for preventing the lid 7 covering the opening from sagging.

It should be noted that a planetary gear reducer and a motor with a brake may be used as a drive source without using a clutch.

The method of this embodiment simplifies the operation,
There is an advantage of energy saving.

Next, a third embodiment of the present invention will be described with reference to FIG.

In the first and second embodiments, a drive source is provided for each of the two sprockets 4a, 4b. In the third embodiment, a small-sized drive fixed to both the sprockets 4a, 4b is provided. Transmission sprockets 12a, 12
b are connected by a closed-loop drive chain 11, and the drive chain 11 is operated by one drive source 8, and the other ends of the first roller chain 5 and the second roller chain 6 suspended from both sprockets 4a, 4b. The parts 5b and 6b are characterized in that they are connected to the lower drive chain 11 of the closed loop.

Thus, when the moving lift 3 is moved in the direction of arrow B in FIG.
Move in the same direction and the lower drive chain 11 moves in the direction opposite to the arrow C. At the same time, the vicinity of the end 5b of the first roller chain 5 sags and attempts to move downward. Is connected to the lower drive chain 11 that moves in the direction of arrow C and is pulled.
The first roller chain 5 does not sag, and the lid unit 7 does not come into contact with the floor surface in the pit 1 and a predetermined distance from the floor surface is maintained.

When the moving lift 3 moves in the direction opposite to the direction indicated by the arrow B, the second roller chain 6 moves in the same manner as described above.
The lid unit 7 does not come into contact with the floor surface in the pit 1 without slack, and is kept at a predetermined distance from the floor surface.
However, damage due to contact with the floor is prevented, and workability in the pit 1 is improved.

Further, the first and second roller chains 5,
6 is connected to the lower drive chain 11 on the lower side of the closed loop, the drive chain 11 is always pulled by the weight of each end 5b, 5b of the first and second roller chains 5, 6. In this state, the first and second roller chains 5 and 6 and the lid 7 are moved together with the drive chain 11 regardless of which direction the drive chain 11 is rotated by the drive source 8.
And the moving lift 3 moves immediately without a time lag.

Further, even if the pit 1 is long between the two sprockets 4a and 4b, the other end portions 5b and 6b of the first and second roller chains 5 and 6 are connected to the drive chain 11 and move. The roller chains 5 and 6 do not hang down on the lower surface in the pit 1, and do not become dirty or cause trouble in maintenance.

[0032]

As described above, according to the present invention, the opening of the pit is completely covered regardless of the position of the moving lift, so that the maintenance and inspection work is safe and the movement of the lift and the cover becomes smooth. This has the effect that the lower part of the pit is neatly arranged and maintenance is easy.

[Brief description of the drawings]

FIG. 1 is a front sectional view of first and second embodiments of the present invention.

FIG. 2 is a plan view thereof.

FIG. 3 is a cross-sectional view of a portion of the moving lift.

FIG. 4 is a front sectional view of a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pit 2 Fixed lift 3 Moving lift 4 Sprocket 5 1st roller chain 6 2nd roller chain 7 Lid alone 8 Drive source 11 Drive chain

Claims (5)

[Claims] 1. A moving lift device wherein an opening of a pit formed on a floor is provided with one fixed lift at one end thereof, and the other moving lift is movably provided along the opening. A sprocket having a drive source connected to the vicinity of one end and the other end in the pit is pivotally supported, and one end of the first roller chain and one end of the second roller chain wound around the sprocket are connected before and after the moving lift. A pit cover device for a mobile lift device, wherein a plurality of lids each having a rectangular cross section whose both ends are movably engaged with both side edges of the opening are connected to the first and second roller chains. 2. The pit cover device for a mobile lift device according to claim 1, wherein the two driving sources are driven to rotate forward or backward in synchronization. 3. In each connecting means between each of said sprockets and each of said driving sources, a connecting means on a pulling side of said moving lift is connected and a connecting means on a pulling side of said moving lift is non-connected. 2. The pit cover device for a mobile lift device according to claim 1, further comprising means for establishing a connection state. 4. The pit cover device for a mobile lift device according to claim 1, wherein the other end portions of the first and second roller chains hanging from the two sprockets are suspended and connected upward. . 5. A moving lift device wherein one fixed lift is provided at one end of an opening of a pit formed on a floor surface, and the other moving lift is movably provided along the opening. A sprocket is pivotally supported near one end and the other end of the pit.
Numerous cross sections each of which connects one end of a roller chain and a second roller chain before and after the moving lift, and movably engages the first and second roller chains at both ends with both side edges of the opening. A single rectangular lid is connected, the two sprockets are connected to one drive source via a closed loop drive chain, and the other end portions of the first roller chain and the second roller chain are lifted to form the closed loop. A pit cover device for a mobile lift device, wherein the pit cover device is connected to the lower drive chain.