JPH065354Y2 - Descent prevention device in vehicle maintenance lift - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a vehicle maintenance lift, in which a vehicle pedestal or a supporting plate is lifted for safety when the ram is lifted as the ram is lifted. The present invention relates to a descent prevention device for holding.

"Prior Art" Conventionally, as a descent prevention device in a vehicle maintenance lift, there has been an embodiment as shown in Fig. 11, for example.

That is, 1 is a hydraulic cylinder that is appropriately buried under the floor of the maintenance bay, and a ram 3 having a vehicle receiving stand 2 at the upper end is fitted and inserted into this hydraulic cylinder 1. Reference numeral 4 is a support pipe that is opposed to the hydraulic cylinder 1 with a required space, and a ram rotation stop rod 5 that is vertically provided on the lower surface of the vehicle support base 2 is loosely inserted in the support pipe 4. Reference numeral 6 denotes a through hole formed in the ram rotation stop rod at a predetermined interval, and a safety pin 7 attached to the upper end of the support pipe 4 via a chain is removed from the through hole 6.

[Problems to be Solved by the Invention] In the embodiment described in the related art, the safety pin 7 is inserted through the through hole 6 at a desired position when the ram 3 is lifted by hydraulic pressure.
Although it can be said that the ram 3 can be prevented from lowering by inserting it into the through hole 6, the operability is very poor because the safety pin 7 for inspection needs to be pierced into the through hole 6, and the through hole 6
If the safety pin 7 does not completely enter the through hole due to dust clogging, or if the safety pin 7 happens to be rusted and breaks, the lowering prevention device does not work reliably. Further, as described above, it was necessary to frequently perform a refueling operation from the viewpoint that the safety pin 7 is rusted or worn.

The present invention has been made in view of the above problems of the prior art, and an object thereof is an operating rod (ram) when a trouble occurs in a hydraulic system when a maintenance vehicle is lifted up. It is possible to reliably prevent the lowering of the operating rod, and it is possible to immediately prevent the operating rod from lowering when the operating rod is raised to a desired position during maintenance and inspection, but to unlock it by a simple operation. (EN) It is intended to provide a descent prevention device in a vehicle maintenance lift, which can prevent the rust and wear of each component, and can prevent the descent of the operating rod and the rotation of the operating rod. is there.

[Means for Solving the Problems] In order to achieve the above object, a descent prevention device in a vehicle maintenance lift according to the present invention has a rack installed internally in a hydraulic cylinder buried in a floor surface. An engaging claw that is always engaged is pivotally attached to a mounting plate provided on the bottom plate of the ram of the hydraulic cylinder, and the engaging claw is engaged from the rack by a rotation operation of a release lever having a sliding contact portion that slidably contacts the engaging claw. It is to be released.

The rack is preferably formed in a U-shaped cross section in order to prevent the ram from rotating.

Further, the above-mentioned descent prevention device is provided with a bottom plate of the ram or a mounting plate fixed to the bottom plate protruding from the peripheral body portion thereof for the purpose of surely preventing the ram from falling and easiness of operation for unlocking work, and is installed in the hydraulic cylinder. It is also possible to disengage the rack provided and always engaged with the bottom plate or the mounting plate by pulling up the release lever.

Further, for the same purpose, a rack is internally provided in the hydraulic cylinder, an engaging pawl is provided on the ram side so as to always engage with the rack, and a sliding contact portion penetrating the ram and slidingly contacting the engaging pawl is provided. The engagement claw can be released from the rack by rotating the release lever.

"Operation" The descent prevention device is installed inside the hydraulic cylinder whose main part is buried in the floor.

The rack of the descent prevention device engages with the engaging claws of the hydraulic cylinder at the same position when locking the ram, or the rack draws an arc and descends toward the hydraulic cylinder,
Engages with the bottom plate of the hydraulic cylinder. On the other hand, when releasing the locked state of the ram, leave the rack as it is and rotate the release lever in the circumferential direction to release the engaging pawl from the rack at the rear part of the release lever, or the rack draws an arc. Move up and down toward the inner wall of the hydraulic cylinder and away from the bottom plate or mounting plate of the hydraulic cylinder.

[Example] An example will be described with reference to the drawings. In FIGS. 1 to 6, reference numeral 10 denotes a hydraulic cylinder embedded in a floor surface F, and a ram 12 having a vehicle pedestal (not shown) at its upper end is inserted into the hydraulic cylinder 10. . In addition,
Reference numeral 13 is a pipe for supplying hydraulic pressure to the hydraulic cylinder 10, and 14 is a seal member fitted into the upper end opening of the hydraulic cylinder 10. Reference numeral 15 denotes a rack having a U-shaped cross section provided inside the hydraulic cylinder 10. In this embodiment, the rack 15 is fixedly provided so that its back side abuts the inner wall 10a of the hydraulic cylinder 10. Reference numeral 16 denotes a pair of mounting plates fixedly opposed to the bottom plate 17 of the ram 12. The mounting plates 16 are provided with engaging claws 18 which are engaged with and disengaged from the rack 15 as shown in FIG. There is. The engaging claw 18 is constantly urged by a spring member 19 so as to engage with the rack. Reference numeral 20 denotes a release lever which is rotatably mounted in a storage groove 21 formed on the front side of the rack 15 and which engages and disengages the engaging claw 18 with the rack 15. The release lever 20 is shown in FIG. And a sliding contact portion 20a formed by cutting out or cutting out at least a half side of the cylindrical body,
The sliding contact portion 20a includes an operating portion 20b which is continuously provided on the upper end portion and penetrates the seal member 5 described above.

In the above configuration, when the cutout portion 21 of the release lever 20 faces the ram 12 as shown in FIGS. 2 and 3, the engaging claw 18 is moved by the spring force of the spring member 19 to the rack 15. Is in the engaged state.

Then, when the ram 12 is lifted by the hydraulic pressure, the engaging claw 18 gets over the teeth 15a of the rack by one touch, and when the ram 12 is lifted to a desired position and stopped, the ram 12 is immediately prevented from being lowered. On the other hand, when the release lever 20 is rotated as shown in FIGS. 4 and 6 and the cutout portion 21 faces the rack or the inner wall 10a of the hydraulic cylinder 10, the engaging claw 18 is provided on the rear surface of the release lever 20. It is released from the rack 15 by the side sliding contact portion 20a. Then, when the ram 12 descends, the engaging claw 18 makes sliding contact with the sliding contact portion 20a of the release lever 20, and the ram 1
It goes down with 2.

Next, in the embodiment shown in FIG. 7 to FIG. 9, the bottom plate of the ram 12A fitted into the hydraulic cylinder 10A or the mounting plate 17A fixed to the bottom plate is projected from the peripheral body part to a slightly larger size, and is projected. A notch 23 facing the rack 15A is formed in a part of the bottom plate 17A. The rack 15A is a hydraulic cylinder 1
It is provided on the inner wall 10a of 0A so as to move up and down in an arc by a plurality of vertical links 24, 25. Specifically, the links 24 and 25 are pivotally attached to mounting portions provided on the upper and lower portions of the inner wall 10a of the hydraulic cylinder 10A, and the rack 15A is attached to one end of each of the upper and lower links 24 and 25 by pins 26 and 27. It is pivotally supported. The rack is provided at least in the upper link 24, and the release lever 20A is provided via an end face L-shaped guide portion 29 having a horizontal elongated hole 28 for escape in which the upper pin 26 horizontally moves.
Connected with.

In the above structure, the release lever 20A as shown in FIG.
The upper and lower links 24 and 25 are positioned horizontally when the rack is lowered, and the bottom plate or mounting plate 17A of the ram 12A and the rack 15A are in an engaged state. Then, when the release lever 20A is lifted upward when the ram 12A is slightly raised, the upper pin 26A
Is guided by the horizontal elongated hole 28 of the guide portion 29 and the hydraulic cylinder
Move to the inner wall 10a side of 10A, and link each link as shown in FIG.
The racks 24 and 25 are positioned vertically, and the rack 15A approaches or abuts the inner wall 10a in an arc. Therefore, the ram 12A is unlocked from the rack 15A and can freely move up and down.

The embodiment shown in FIG. 10 has the same concept as the embodiment shown in FIGS. 1 to 6 described above, but the main difference is that the release lever 20B is provided through the ram 12B. , The operation part of the release lever that is appropriately guided outward from the vehicle cradle 2B
The point is that when the rotating operation of 30 is performed, the engagement claw 18B is disengaged from the rack 15B by the cam-shaped sliding contact portion 31 provided at the lower end of the release lever 20B.

"Effect of Invention" Since the present invention is configured as described above, it has the following effects.

(1) In the descent prevention device according to claim 1, since the engaging claws climb over the teeth of the rack and ascend, the engaging claws surely bite the teeth of the rack immediately when the ram is raised to a desired position. The ram can be prevented from falling. On the other hand, when the engaging claw is disengaged from the rack, it is only necessary to rotate the releasing lever, and therefore the releasing operation is very simple. Further, since the main components such as the engaging claws and the rack are provided inside the hydraulic cylinder, there is no fear of rust or wear of these parts, and the durability is excellent. By forming the rack in a U-shaped cross section, the rotation of the ram can be prevented at the same time.

(2) In the descent prevention device according to the second aspect, the ram and the rack are engaged and disengaged only by raising and lowering the release lever, and the same effect as the above (1) can be obtained. The bottom plate or the mounting plate protruding from the ram is provided with a notch facing the rack, so that the rotation of the ram can be prevented at the same time.

(3) The fall prevention device according to claim 3 can obtain substantially the same effect as the fall prevention device according to claim 1.

[Brief description of drawings]

1 to 6 are schematic explanatory views showing the embodiment described in claim 1, FIGS. 7 to 9 are schematic explanatory views showing the embodiment described in claim 2, and FIG. FIG. 11 is a schematic explanatory view showing an embodiment described in claim 3, and FIG. 11 is a schematic explanatory view showing a conventional embodiment. 10,10A …… hydraulic cylinder, 12,12A, 12B …… ram, 15,15A, 15B …… rack, 16 …… mounting plate, 17,17A …… bottom plate, 18,18B …… engaging claws, 20, 20A, 20B …… Unlocking lever.

Claims (3)

[Scope of utility model registration request] 1. A bottom plate (17) of a ram (12) or a mounting plate provided on the bottom plate, wherein a rack (15) is installed in a hydraulic cylinder (10) buried in a floor surface, and the ram (12) is inserted into the hydraulic cylinder. An engaging claw (18) that constantly engages with the rack is pivotally attached to (16),
(18) is a vehicle maintenance lift characterized in that engagement is disengaged from the rack (15) by rotating a release lever (20) having a sliding contact portion (20a) located in a hydraulic cylinder (10). Fall prevention device. 2. A hydraulic cylinder (10A) buried in a floor is provided with a rack (15A) therein, and a plurality of the racks are engaged with a bottom plate (17A) protruding from a peripheral body portion of a ram (12A). Link of
(24, 25) is pivotally attached to the inner wall of the hydraulic cylinder (10a), and is disengaged from the bottom plate (17A) by a lifting operation of a release lever (20A). Prevention device in the. 3. A rack (15B) is installed in a hydraulic cylinder (10) buried in the floor, and a ram (12) of the hydraulic cylinder (10) is installed.
An engaging claw (18B) which is constantly engaged with the rack is pivotally attached to a mounting plate (16) provided on a bottom plate (17) of (B), and the engaging claw penetrates the hydraulic cylinder and engages the engaging claw ( 18B) is a release lever (20B) having a sliding contact portion (31) in sliding contact with the rack (15B) to be disengaged from the rack (15B). Fall prevention device.