JP2546656Y2 - Vehicle maintenance lifter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial application field) The present invention relates to a lifter used to lift a vehicle when inspecting and maintaining the vehicle.

(Prior art) There are various types of lifters, but basically, an elevator for directly mounting a vehicle can be raised and lowered via an X-type parallel expansion and contraction mechanism, and a hydraulic cylinder is used as a driving means. . The lifters that are the object of the present invention are arranged in parallel at a predetermined distance in pairs, supporting the left and right sides of the vehicle and lifting them up, entering between the two lifters for inspection and repair work. It is configured to be able to do it. Therefore, it is necessary that the left and right elevators are always at the same height to perform the ascent and descent movement.
A "vehicle maintenance lift" according to No. 6397 is known. In this lift, a communication path is provided between one end sides of both pits, loosely fitted in the communication path, a connecting shaft spanning both pits is pivotally supported at one end in the longitudinal direction of both pits, and an X-shaped parallel In the telescopic mechanism, one pair of link lower ends is fixed to the connecting shaft. Therefore, for example, even if the hydraulic pressure drops in one of the hydraulic cylinders, the X-type parallel expansion / contraction mechanism is synchronized by the connecting shaft,
The heights of the elevators are always equal without any difference, and as a result, the safety of the work is ensured because the loaded and lowered vehicle does not tilt. In addition, the above mechanism is very simple, so that it is easy to manufacture and does not require maintenance and inspection.

However, using such a connecting shaft for connecting the left and right lifters is troublesome in the manufacturing and installation work. That is, it is not easy to fix the end of each link to the connecting shaft in the same direction in all directions,
A slight difference in angle causes a large variation in the height of the elevator. In addition, it is difficult to transport with the link fixed, and it is difficult to support the connecting shaft horizontally in the pit.Therefore, it takes a lot of man-hours and troublesome work to examine the levelness and install it. Become.

(Purpose of the present invention) As described above, the structure in which the link end of the X-type parallel expansion / contraction mechanism is fixed to the connection shaft through the connection shaft between the left and right lifters has the above-described problem. The present invention is a technology developed to solve this problem, and provides a vehicle maintenance lifter that has a simpler structure, and that allows the lifts of both lifters to be always raised and lowered equally, and that is convenient for manufacturing and installation work. .

(Structure of the present invention) The basic structure of the vehicle maintenance lifter according to the present invention includes an X-shaped parallel expansion and contraction mechanism, and a structure in which an elevator is attached to the upper end thereof. The point of using a cylinder is the same as before. The hydraulic circuits of both hydraulic cylinders are serialized to keep the heights of both lift tables equal at all times, and the piston rod moves to expand and contract by flowing into one hydraulic cylinder, and flows out of the hydraulic cylinder. The movement of the piston rod which expands and contracts by flowing into the other hydraulic cylinder is equalized.
Since hydraulic oil is considered incompressible, the piston rods of both hydraulic cylinders can extend and contract in synchronism with each other unless air is mixed in the hydraulic oil.

However, by serializing two hydraulic cylinders,
It is possible to synchronize the movement of the piston rod, but the cross-sectional areas of the cylinder chambers on both sides of the piston differ, and in this case, there is a difference between the amount of hydraulic oil flowing into and out of the hydraulic cylinder. Therefore, a hydraulic cylinder having the same diameter cannot be used. That is, a specially manufactured hydraulic cylinder must be used,
In this invention, the adjusting hydraulic cylinder is interposed between the two hydraulic cylinders, and the direction of the adjusting hydraulic cylinder is reversed, so that these three hydraulic cylinders are connected in series. Combine and configure. Needless to say, the adjusting hydraulic cylinder is used only for equalizing the amount of hydraulic oil flowing into and out of the hydraulic cylinders, and is not involved in the lifting operation of the lifter.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment) FIG. 1 is a schematic diagram of a hydraulic circuit provided in the lifter of the present invention. As shown in the figure, the left hydraulic cylinder 1,
A right hydraulic cylinder 2 and an adjusting hydraulic cylinder 3 are arranged respectively, and these three hydraulic cylinders 1, 2, 3
Are connected in series. Hydraulic unit 4 to pipe 5
The hydraulic oil sent out through the cylinder flows into the cylinder chamber 6 of the right hydraulic cylinder 2, thereby pushing out the piston 7 and the piston rod 8, and at the same time, the hydraulic oil in the cylinder chamber 9 passes through the pipe 10 to the cylinder chamber 11 of the adjusting hydraulic cylinder 3. Send out. Adjustment hydraulic cylinder 3 piston 12
The piston rod 13 slides by the inflow of the hydraulic oil, and the hydraulic oil in the cylinder chamber 14 similarly enters the cylinder chamber 16 of the left hydraulic cylinder 1 through the pipe 15 to push out the piston 17 and the piston rod 18. And cylinder chamber 19
The hydraulic oil inside flows through the pipe 20 and returns to the hydraulic unit 4.
Of course, when hydraulic oil is sent from the hydraulic unit 4 to the left hydraulic cylinder 1, the hydraulic cylinders 1, 2,.
3 works.

Therefore, if the inner diameter and the piston rod diameter of the right hydraulic cylinder 2 and the adjusting hydraulic cylinder 3 are made equal, the moving distance of the piston 7 and the piston 12 becomes equal, and the inner diameter of the adjusting hydraulic cylinder 3 and the left hydraulic cylinder 1 and the piston rod diameter Are equal, the moving distances of the pistons 12 and 17 are also equal. That is, three hydraulic cylinders 1, 2, and 3 having the same dimensions are arranged in series, so that the left hydraulic cylinder 1 and the right hydraulic cylinder 2
The piston rods 18, 8 extend and contract in synchronism with each other, and the amount of expansion and contraction becomes equal.

Of course, as shown in the figure, the inlet and outlet of the adjusting hydraulic cylinder 3 are opposite to the left and right hydraulic cylinders 1 and 2,
That is, the directions of the adjusting hydraulic cylinders 3 are opposite to each other in series.

FIG. 2 shows a specific example of a lifter provided with the hydraulic cylinders 1, 2, and 3. Reference numeral 21 denotes a rectangular pit dug and formed on the floor surface, the pits 21 and 21 are provided in parallel at a predetermined interval, and a bearing 22 is disposed on a side surface of the pit 21. A shaft 23 is rotatably supported on the shaft, and rails 24, 24 having a U-shaped cross section are horizontally provided on both left and right sides of the pit 21. As shown in the figure, the lifter has an X-type parallel expansion / contraction mechanism, and is configured by connecting the X-type parallel expansion / contraction mechanism in upper and lower two stages, and a lift 25 is attached to the upper end. . The X-shaped parallel expansion / contraction mechanism is such that links 26a and 26b cross-connected to an X-shape are arranged in parallel. The lower end of the link 26a is attached to the shaft 23, and the link 26b
A roller 27 is pivotally supported at the lower end, and the roller 27 is slidable along the rail 24. Also the upper and lower X
The mold parallel expansion and contraction mechanisms are connected to each other with a shaft 28. The left hydraulic cylinder 1 is rotatably supported by a bearing 29 fixed to the shaft 23 of the left lifter. The tip of the piston rod 18 has a shaft hung on the upper ends of links 26b, 26b constituting an upper X-type parallel expansion / contraction mechanism. Connected to 30. Similarly, the right hydraulic cylinder 2 is similarly attached to the right lifter, and the piston rods 18 and
The X-type parallel expansion / contraction mechanism expands / contracts by the expansion / contraction action of 8, and the elevating table 25 moves up and down. A rack 31 is disposed on both sides of the piston rods 18 and 8 in parallel with the piston rods 18 and 8, and a locking claw 32 attached to the hydraulic cylinder body side is provided with the rack 31.
And can function as a safety device.
By the way, an auxiliary pit 33 is dug on the floor surface, and the adjusting hydraulic cylinder 3 is set in the auxiliary pit 33, and the hydraulic circuit is connected in series with the left and right hydraulic cylinders 1 and 2 as described above. It is configured.

Here, as a specific embodiment, in FIG. 2, a lifter configured with two stages of the X-type parallel expansion and contraction mechanism has been described, but a single-stage X-type parallel expansion and contraction mechanism may be used. It can be a tier. The mounting form of the hydraulic cylinder is not limited, and any type may be used as long as the X-type parallel expansion and contraction mechanism can expand and contract by the expansion and contraction action of the piston rod, so that the elevator 25 can be moved up and down.

As described above, the lifter of the present invention has the adjusting hydraulic cylinder in the middle and is connected in series with the respective hydraulic cylinders mounted on the left and right lifters.
The following effects can be obtained.

(Effect) In the lifter of the present invention, the right and left hydraulic cylinders are connected by a hydraulic circuit in series, so that the lifts of the left and right lifters move up and down in synchronization with each other, and there is no variation in height. Therefore, the vehicle mounted on both elevators is stable without tilting, and the safety of inspection and repair work is guaranteed. Further, in the present invention, not only the left and right hydraulic cylinders are simply connected in series but also an adjusting hydraulic cylinder is interposed therebetween, so that these three hydraulic cylinders are cylinders having the same cylinder inner diameter and the same piston rod diameter. Therefore, there is no need to use a hydraulic cylinder manufactured with a special size.

[Brief description of the drawings]

FIG. 1 shows a hydraulic circuit used for the lifter of the present invention, and FIG. 2 shows a specific example of the lifter. 1 ... left hydraulic cylinder, 2 ... right hydraulic cylinder, 3 ... adjusting hydraulic cylinder, 4 ... hydraulic unit, 5, 10, 15, 20
... pipe, 6, 9, 11, 14, 16, 19 ... cylinder chamber,
7, 12, 17 ... piston, 8, 13, 18 ... piston rod,
21 ... pit, 22, 29 ... bearing, 23,28 ... shaft, 24 ... rail, 25 ... lift, 26 ... link, 27 ... roller, 30 ... shaft, 31 ... rack, 32 ... locking claw, 33 ... auxiliary pit.

Claims (1)

(57) [Scope of request for utility model registration] 1. A left and right lifter arranged side by side at a predetermined interval, wherein the lifter is constituted by using an X-shaped parallel expansion and contraction mechanism, a lifting platform is mounted on an upper end, and the X-shaped parallel expansion and contraction mechanism is provided. In the lifters, the expansion and contraction of the mechanism and the elevating movement of the elevator are performed by the expansion and contraction of the piston rod of the hydraulic cylinder attached to an appropriate place. The left and right lifters are provided with hydraulic cylinders of the same size (size). The adjusting hydraulic cylinder is disposed between the two hydraulic cylinders in the opposite direction, and these three hydraulic cylinders are connected and configured by a serial hydraulic circuit. In addition, the inner diameter of the adjusting hydraulic cylinder and the piston rod Vehicle maintenance lifter whose diameter is equal to the left and right hydraulic cylinders.