JPH0518389Y2 - - Google Patents

Description

[Detailed description of the invention] A. Industrial application field The present invention relates to a vehicle maintenance lift used to lift a vehicle to a predetermined height and perform repairs, maintenance, inspections, etc. of the vehicle. The present invention relates to a buried vehicle maintenance lift that has high rigidity and high safety due to its simple and effective configuration using an X-type parallel link mechanism.

B. Prior art Lifting devices that utilize an
As described in Publication No. 67500, the platform was configured to be able to rise and fall using a single-stage X-shaped parallel expansion/contraction mechanism, and as in Japanese Patent Publication No. 10821/1982, a two-stage X-shaped parallel expansion/contraction mechanism was adopted. something is known.

C. Problems to be solved by the invention In all conventional lifting devices, the X-shaped parallel expansion/contraction mechanism is located at the tip of the piston rod of the cylinder whose base end is pivotally connected to the bottom, and is located slightly below the center of the link facing the cylinder. Since the structure pushes up the upper part, it has the advantage of being able to move up and down with a smaller stroke compared to the lift-up process, but it also requires a large pushing up force, and there is a large gap between the push-up part and the platform, and there is no link between them. It is disadvantageous to ensure high rigidity because it is supported only by the support. Furthermore, no countermeasures have been taken against cylinder synchronization failure or oil pressure drop, and it is extremely dangerous, especially when a heavy object is lifted up and work is carried out under it, such as a vehicle maintenance lift.

D. Means for Solving the Problems In view of the drawbacks of the conventional lifting devices described above, the present invention provides a highly safe vehicle maintenance lift that utilizes an X-type parallel link mechanism. Two pits were dug, and on the left and right sides of each pit, there was an X-shaped parallel telescopic mechanism that could be folded into the pit when retracted. The lower end of one side of the mechanism is pivotally connected, and the lower end of the other side is slidably provided along the inner bottom surface, and the upper end of one side is pivotally connected to the vehicle platform that is raised and lowered by the X-shaped parallel expansion and contraction mechanism. , the lower end of the other side is slidably attached along the inner bottom surface, and the base end of the hydraulic cylinder is pivotally connected to the end of the inner bottom of the pit, and the tip of the piston rod is attached to the upper end of the X-shaped parallel expansion mechanism. The cylinders are pivotally connected to a connecting shaft installed near the moving parts, and the cylinders are connected to each other by a hydraulic circuit with a hydraulic synchronization mechanism.Furthermore, each hydraulic cylinder has a rack installed parallel to the piston rod, and a rack installed on the cylinder body. A lowering prevention mechanism is provided, and the X-shaped parallel expansion/contraction mechanism has a two-stage structure.

E. Effect By using the X-shaped parallel expansion mechanism in two stages, the length in the longitudinal direction when folded is reduced by half, which has the advantage of shortening the length of the pit. Since hydraulic cylinders are arranged all the way between the lower end and used for reinforcement, high rigidity is ensured and less force is required for lifting up, which is especially advantageous when starting up. Furthermore, safety is guaranteed by the hydraulic synchronization mechanism and the lowering prevention mechanism.

F. Example A vehicle maintenance lift according to the present invention will be explained based on the drawings.

In Figure 1, 1 is a rectangular pit dug approximately 20 cm below the floor surface, and rails 2, 2 with a U-shaped cross section are installed on both sides of the pit 1 from one end to the middle. At the same time, pivot shafts 3, 3 are provided at the other end.

4, 4 pivotally supports the first link 4a and the second link 4b in the X direction at the center, and the third link 4c and the fourth link
The link 4d is also pivoted in an X shape at the center.
A two-stage X with a shape-parallel expansion mechanism connected above it
The two-stage X-shaped parallel expansion and contraction mechanism 4, 4 has the lower end of the first link 4a pivotally connected to the pivot shaft 3, and the roller 5 is attached to the lower end of the second link 4b. , the roller 5 is fitted into the rail 2 so that the lower end of the second link 4b can slide along the inner bottom of the pit, and can be expanded and contracted up and down by the opening movement of both lower ends. It's getting old. A vehicle stand 6 is attached to the upper part of the two-stage
A roller 8 whose upper end is pivotally connected to one side end of the vehicle platform 6, and which slides within a rail 7 having a U-shaped cross section provided on both sides of the lower surface of the vehicle platform 6 is attached to the upper end of the fourth link 4d. attached. 4th link 4
At the roller 8 attachment point in d, there is a connecting shaft 9 that connects the two-stage X-shaped parallel expansion and contraction mechanism provided on the left and right.
is installed horizontally. . 10 is a hydraulic cylinder, and this hydraulic cylinder 10 has a two-stage X
The piston rod 10a is pivoted between and parallel to the parallel expansion/contraction mechanisms 4, 4, with its base end coaxially connected to the pivot shaft 3, and the tip of the piston rod 10a is rotatably pivoted to the center of the connecting shaft 9. . Also, on both sides of the cylinder 10,
A locking pawl 12 is provided which can be rotated by a solenoid 11, and the upper end is connected to a piston rod 1.
Rack 13 rotatably supported by connecting shaft 9 on both sides of 0a is attached with its tooth surface facing downward, and the locking pawl 12 and rack 13 are brought into engagement by the action of a solenoid. There is. Two pits 1 are dug in parallel at a predetermined interval, and the lifting device consisting of a two-stage X-shaped parallel expansion/contraction mechanism 4, a vehicle platform 6, a hydraulic cylinder 10, etc. has the same structure on both left and right sides. It's summery. The hydraulic cylinders 19 and 10 are connected in series by an oil pipe 14, as shown in the fourth figure, to ensure that they operate synchronously.

When a vehicle maintenance lift configured in this manner is lifted down, the vehicle platform covers the top surface of the pit, and the floor surface is approximately flat and no protrusions are exposed. . Inside the pit, the two-stage X-shaped parallel expansion/contraction mechanism is completely folded and accommodated in the short space within the pit, and the hydraulic cylinder is also accommodated diagonally therebetween. When hydraulic oil is supplied to the hydraulic cylinder, the piston rod begins to extend, raising each link in the two-stage X-shaped parallel expansion and contraction mechanism and lifting the vehicle platform. The vehicle platform is supported on both sides by a two-stage X-shaped parallel telescoping mechanism, and the X-shape parallel telescoping mechanism has high rigidity because hydraulic cylinders are arranged between the upper and lower ends. The pushing force is also light.

Furthermore, since the hydraulic cylinder is prevented from falling by means of racks and locking pawls provided in parallel on both sides, even if the hydraulic pressure should drop, the workers under the vehicle will be safe.

Furthermore, the hydraulic cylinders are synchronously operated by a series circuit, and the left and right vehicle platforms are always raised and lowered in parallel, so that the vehicle is stably supported.

In addition, the locking/disengaging operation of the locking pawl may be performed manually without using a solenoid.

Effects In the vehicle maintenance lift of the present invention, all the mechanical parts are housed in the pit when the elevator is lifted down, so other work can be done with the floor surface in a flat state, and it is easy to get the vehicle in. Also, since the lifting device can be folded compactly, a small pit is sufficient. Furthermore, it has high rigidity and can be moved up and down using a small hydraulic cylinder, and combined with perfect safety measures, it is extremely reliable.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the vehicle maintenance lift according to the present invention, Figs. 2 and 3 are explanatory diagrams of the elevating device housed in the pit, and Fig. 4 is the connection between the cylinder and the oil pipe. It is an explanatory diagram showing an example. 1... Pit, 2... Rail, 3... Pivot shaft,
4... Two-stage X-shaped parallel expansion and contraction mechanism, 4a... First link, 4b... Second link, 4c... Third link, 4d... Fourth link, 5... Roller, 6...
Vehicle platform, 7...Rail, 8...Roller, 9...
... Connection shaft, 10 ... Hydraulic cylinder, 10a ... Piston rod, 11 ... Solenoid, 12 ... Locking pawl, 13 ... Rack, 14 ... Oil pipe.

Claims (1)

[Scope of utility model registration request] Two parallel pits were dug, and in each pit, a two-stage X-shaped parallel expansion and contraction mechanism that could be folded into the pit when retracted was placed at either the front or rear end of the inner bottom of the pit. The lower end of one side of the telescoping mechanism is pivotally connected, the lower end of the other side is slidable along the inner bottom surface, and the upper end of one side is pivotally connected to the vehicle platform that is raised and lowered by the X-shaped parallel telescoping mechanism. At the same time, the lower end of the other side is attached so as to be slidable along the inner bottom surface, and the base end of a hydraulic cylinder is pivotally connected to the end of the inner bottom of the pit, and the tip of the piston rod is attached to the upper end of the X-shaped parallel expansion mechanism. A lifting device is provided which is pivoted to a connecting shaft installed near the sliding part, the cylinders are connected to each other by a hydraulic circuit having a hydraulic synchronization mechanism, and each hydraulic cylinder is provided in parallel with the piston rod. A vehicle maintenance lift equipped with a lowering prevention mechanism consisting of a rack and a locking pawl provided on the cylinder body so as to be able to lock onto the rack.