JPS62289457A - Jack - Google Patents

Abstract

PURPOSE:To enhance the operating effectiveness and safety by allowing an elevating/sinking table to bear the load of a heavy object to be lifted, heaving the table and object through standing of a lift lever, allowing a grounding element to ground in interlocking with said heaving, and thereby preventing movement of a jack. CONSTITUTION:In application, a jack J is approached to a wheel Wr of a motorcycle from the side, and a shaft 20 is inserted to a hollow part of the axle 2 while the left and right longitudinals 10a are intruded to the front and rear of the wheel Wr. Then a steering wheel lever 28 is turned downward, and a lift lever 23 is standed round a pivot 25. Together with the wheel Wr an elevating/sinking table 14 is heaved by means of the reactive force given by a rail 26, and when the table contacts a stopper 27, the lift lever 23 is held in its standing state. At this time, the lift lever 23 depresses a piston 32 of a movement preventive device 30 against the action of a spring 37 until a grounding element 34 comes in pressure contact with the ground, which provides prevention of the jack J from moving.

Description

Detailed description of the invention 3. Detailed description of the invention This invention relates to a jack equipped with wheels for transportation.

(2) Prior Art Generally, a wheeled jack is provided with a movement prevention device to prevent the frame from moving when the wheel is lifted up.

(3) Problems to be solved by the invention However, in conventional jacks of this type, the operation of the anti-movement device is performed separately from the operation of driving the lift platform upward. I often forget.

The present invention has been made in view of the above circumstances, and is simple and effective because it automatically activates the movement prevention 'AM when the lifting platform is raised to reliably prevent movement of the frame during hoisting work. The purpose of the present invention is to provide the above-mentioned joke.

B6 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the jack of the present invention includes a frame having wheels on the lower surface; and a fixed base fixed to the center of the frame. an elevating table disposed on the fixed table and supported to be able to move up and down; the upper end of the elevating table is pivoted by a horizontal pivot, and the lower end has a horizontal axis formed on the fixed table; a lift lever that is equipped with rollers that can roll on a rail and that can swing between an inclined position that lowers the platform and an upright position that raises the platform; connected to the lift lever and that is longer than the lever; The lift lever is characterized by comprising: a handle lever; and a movement prevention device that provides a grounding body on a fixed base that can advance and retreat with respect to the ground, and connects the grounding body to the ground in conjunction with the raising of the lift lever to prevent movement of the frame. .

(2) Operation When using the jack, first load the heavy object to be lifted onto the lifting platform, then raise the lift lever by rotating the handle lever, and the lift lever will move from the rail through the rollers. As the lift lever is pushed up by the reaction force acting on the lift lever, the heavy object is lifted up. At this time, the lever ratio between the lift lever and the handle lever and the rolling motion of the rollers on the rails combine to make the lifting platform easier to ascend.

Moreover, since the movement prevention device is activated in conjunction with the raising of the lift lever and automatically brings the grounding body into contact with the ground, movement of the frame can be reliably prevented.

(3) Examples An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, J is a jack according to the present invention, which is used to jack up, for example, a rear wheel Wr of a motorcycle M in an upright state.

First, the support structure of the rear wheel Wr of the motorcycle M that is jacked up will be explained with reference to FIGS. The axle 2 is rotatably supported, and a driven sprocket 5 driven by a power unit (not shown) via a chain wheel 4 is fixed to one end of the axle 2, and a hub 6 of the rear wheel Wr is fixed to the other end. . When jacking up the rear wheel Wr, the hollow portion of the axle 2 is utilized.

Now, moving on to the structure of the Jacket J, as shown in Figures 1 to 3, the Jacket J frame 10 consists of a pair of left and right vertical members 10a,', which are arranged in parallel with a space between them.
10a, a pair of left and right diagonal members 10b, 10b, each one end of which is connected to the inner surface of both vertical members 1Oa, 10a, and each other end of which is connected to the outside of one end of both vertical members 10a, 10a, and both vertical members. 1
0a, 10a and both diagonal members 10b, 10b, each of which is composed of several horizontal members 10c...
A pair of caster type front wheels 11 on the lower surface of the tips of 0a and 10a
．． 11, and 1 on the lower surface of the connection between both diagonal members 10b, 10b.
Caster type rear wheels 12 are respectively attached. Therefore, the frame 1o is supported on the ground G at three points by these three wheels 11, 11.12.

As shown in FIG. 4, a fixing table 13 is fixed to the center of the equipment 10C, and an elevating table 14 is disposed above it. The elevating table 14 is integrally provided with a pair of front and rear elevating shafts 15.15 that hang down from the lower surface of the elevating table 14, and these elevating shafts 15.15 are connected to guide holes 16. 16, and regulates the vertical position of the lifting platform 14.

A bearing body 17 is attached to the lifting table 14 by screwing a screw shaft 18 protruding from the lower surface of the bearing into a threaded hole 19 of the lifting table 14. A base end portion of a support shaft 20 that can be inserted into the hollow portion of the axle 2 of the motorcycle M is rotatably supported by the bearing body 17 via a bearing 21, 21'. That is, the supporting shaft 20 is supported in a cantilevered manner. The height of the support shaft 20 can be finely adjusted by rotating the screw shaft 18, and after adjustment, it is fixed by tightening the lock nut 22.

At this time, the support shaft 20 is oriented parallel to the longitudinal members 10a, 10a and in the direction between the left and right front wheels 11.11.

The upper ends of a pair of lift levers 23, 23 each having a roller 24, 24 at the lower end are pivotally connected to the left and right sides of the lifting platform 14 via a horizontal pivot 25 so as to be swingable in the front and rear directions.

As shown in FIG. 5, the rollers 24.24 roll on horizontal rails 26.26 formed at the bottom of both sides of the fixed base 130 as the lift lever 23.23 swings back and forth. The length of the lift levers 23, 23 including these rollers 24, 24 is set to be sufficiently thicker than the height from the rail 26, 26 to the pivot shaft 25. If so, the reaction force exerted by the rail 26.26 on the lift lever 23.23 via the roller 24.24 causes the lifting platform 14 to be moved to the fixed platform 13.
can be pushed upwards.

Although the lift lever 23.23 can freely swing rearward (toward the rear wheel 12), the lift lever 23,
A stopper 27 , 27 that can catch the front surface of 23 is fixed to the fixed base 13 .

The lift levers 23.23 are connected to both ends of a U-shaped handle lever 28 that extends rearward to a length sufficiently longer than the levers, and the lift levers 23.23 are driven by vertical movement of the handle levers 28. be done.

As shown in FIGS. 2 and 5, the fixed base 13 is also provided with a pair of left and right movement prevention devices 3 that are pressed by rollers 24 and 24 and touch the ground at the forward swing limit of the lift lever 23.
0.30 is provided. Each movement prevention device 30 includes an inverted cup-shaped piston 32 that slides into a vertical cylinder hole 31 that opens on the surface of the rail 26, and this piston 32.
It includes a small piston 33 that slides into the small piston 33, and a grounding body 34 that is vertically adjustable and fixed to the small piston 33 and extends toward the ground G. On the lower surface of the grounding body 34, a non-slip plate 35 made of rubber or the like is provided. is pasted.

In order to regulate the upper limit of the piston 32, the piston 32
An annular step 31a that engages with a shoulder 32a on the outer periphery is formed at the upper end periphery of the cylinder hole 31, and at its upper limit, the piston 3
2 has a truncated conical portion 32b at the upper end protruding above the rail 26.

A cover plate 36 that prevents the small piston 33 from being pulled out downward is screwed onto the lower end of the piston 32, and a grounding spring 37 that urges the small piston 33 toward the cover plate 36 is housed within the piston 32. . The strength of this grounding spring 37 is set to be slightly weaker than the sum of the weight of the jack J and the vehicle weight applied to the jack J.

A cover plate 38 is screwed onto the lower end of the cylinder hole 31 to prevent the piston 32 from being pulled out from the hole 31, and a return spring 39 is provided between the cover plate 38 and the piston 32 to urge the piston 32 upward. It will be stored.

Next, the operation of this embodiment will be explained. When the jack J is not in use, the handle lever 28 is rotated upward to tilt the lift lever 23 to the rear as shown in FIG. In this way, the lifting platform 14 is lifted by the fixed platform 1 due to its own weight.
3 and keep the lift lever 23.23 in the above-mentioned inclined state. On the other hand, in each movement prevention device 30, the grounding body 34 is separated from the ground G by holding the piston 32 at the upper limit by the force of the return spring 39. Therefore, in this state, by grasping the handle lever 28 and pushing or pulling it, the entire jack J can be easily moved while rolling the front wheels 11, 11 and the rear wheel 12.

To use it, first, one worker approaches the rear wheel Wr of the motorcycle, which is kept upright, from the side, and the other worker approaches the jack J in the same manner as before, and then The support shaft 20 is fully inserted into the hollow part of the axle 2 while the vertical members 10a, 10a are advanced into the front and rear of the rear wheel Wr. At this stage, even if the worker removes his hands from the motorcycle, the motorcycle M will no longer tip over.

Next, by rotating the handle lever 28 downward as shown in FIG. 2A, the lift levers 23, 23 are swung forward around the pivot 25, and the lift levers 23, 23 move the rollers 24, 24 onto the rails. 26.26, and the reaction force received from the rail 26.26 pushes up the platform 14 together with the rear wheel Wr, and the lift levers 23, 23 pass the dead center. Stotsuba 27
When the lift levers 23 and 23 come into contact with the angle 27°, the weight applied to the lifting table 14 keeps the lift levers 23 and 23 in the upright position. In this way, the rear wheel Wr is easily jacked up by one worker.

On the other hand, in each anti-movement device 30, the piston 32 is pushed down by the lift lever 23 which has reached its forward swing limit so as to bring the grounding body 34 into pressure contact with the ground G, and after the grounding body 34 comes into contact with the ground, the piston 32 is pushed down while compressing the grounding spring 37. Therefore, at this time, three wheels 1
Even if there is a step or unevenness on the ground G between each of 1.11.12, each wheel 11.11.12 will not be lifted off the ground G, and the spring force of the grounding spring 37 will move the grounding body 34 to the ground G.
It is possible to securely press the jack J and prevent movement of the jack J.

In such a jacked-up state, maintenance work such as attaching and detaching the rear wheel Wr is performed, for example. At that time, the rear wheel Wr may be rotated, but the support shaft 20 supporting the axle 2 is rotated through the lifting platform 14 via the bearings 21° 21' as described above.
Since it is rotatably supported by the upper bearing body 17, the support shaft 20 rotates together with the axle 2, allowing smooth rotation of the rear wheel Wr.

Moreover, since there are no obstacles on the tip side of the cantilevered support shaft 20, the rear wheel Wr can be easily attached and detached on the tip side.

Effects of the C0 Invention As described above, the jack of the present invention includes a frame with wheels on the lower surface; a fixed base fixed to the center of the frame; and a fixed base that is disposed on the fixed base and can be raised and lowered thereon. A lifting table supported by; the upper end of the lifting table is pivoted by a horizontal pivot, and the lower end is equipped with a roller that can roll on a horizontal rail formed on the fixed table, and the lifting table is lowered. a lift lever that can swing between an inclined position to raise the platform and a standing position to raise the platform; a handle lever connected to the lift lever that is longer than the lever; and a movement prevention device that connects this grounding body to the ground in conjunction with the raising of the lift lever to prevent movement of the frame, making it possible to easily lift heavy objects by simply rotating the handle lever. Can be done.

Furthermore, at the same time, the movement prevention device is automatically activated to reliably prevent movement of the frame, and therefore there is no need to worry about forgetting to operate the movement prevention device, resulting in high safety.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a perspective view of the jack of the present invention, FIG. 2 is a vertical sectional side view of the main part of the jack, and FIG. 3 is a plan view thereof, FIG. 4 is a sectional view taken along line rV-IV in FIG. 3, and FIG. 5 is a sectional view taken along line V-V in FIG. 4. J... Jacket 10... Frame, 11... Front wheel as a wheel, 1
2... Rear wheel as a wheel, 13... Fixed stand, 14.
... Lifting platform, 23... Lift lever, 24... Roller, 25... [dl, 26... Rail, 28...
Handle lever, 30...Movement prevention device, 34...
Grounded body Applicant: Honda Motor Co., Ltd. No. 5
figure

Claims (1)

[Claims] a frame with wheels on the lower surface; a fixed base fixed to the center of the frame; a lifting table disposed on the fixed table and supported so as to be able to rise and fall; The lower end is equipped with a roller that can roll on a horizontal rail formed on the fixed base, and is between an inclined position where the platform is lowered and an upright position where the platform is raised. a lift lever capable of swinging; a handle lever connected to the lift lever and longer than the lever; a grounding body movable toward and away from the ground provided on a fixed base;
A movement prevention device that connects the grounding body to the ground in conjunction with the raising of the lift lever to prevent movement of the frame.