JPS62290698A - Jack for motorcycle - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention A9 Purpose of the Invention fll Industrial Application Field The present invention relates to a motorcycle jack used to jack up a rear wheel or a front wheel when maintaining a motorcycle. Regarding.

(2) Conventional technology Traditionally, when servicing a motorcycle, a worker lifts the motorcycle so that the rear or front wheels are off the ground, and then another worker places fixed stands on the underside of both ends of the motorcycle's axle. I try to support myself.

(3) Problems to be solved by the invention As mentioned above, the work of supporting stands on the underside of the axle not only requires a lot of manpower but is also heavy work. Since it interferes with the attachment and detachment of the wheels, there is a drawback that depending on the content of the maintenance work, it may become a problem.

The present invention has been made in view of the above circumstances, and allows even a single worker to easily jack up the wheels of a motorcycle, and also allows various maintenance tasks such as attaching and detaching the wheels to be easily performed. The purpose of the present invention is to provide a motorcycle jack that can be used for motorcycles.

B1 Structure of the Invention (1) Means for Solving the Problems In order to achieve the above object, the motorcycle jack of the present invention includes a frame having wheels on the lower surface; a fixed base; a lifting table disposed on the fixed table and supported so as to be able to move up and down; a support shaft supported in a cantilevered manner on the lifting table and inserted into a hollow axle of a motorcycle; The upper end is pivotally connected to the lifting platform by a horizontal pivot, and the lower end is equipped with a roller that can roll on a horizontal rail formed on the fixed platform, which allows the lifting platform to be lowered to an inclined position and raised. A lift lever that can be swung between a standing position and a handle lever that is connected to the lift lever and is longer than the lever.

(2) Function When using the jack, first insert the support shaft into the hollow axle of the rear or front wheel of the motorcycle while moving the wheeled frame with the platform in the lowered state, and then press the handle lever. When the lift lever is raised by a rotational operation, the lifting platform is pushed up by a reaction force acting on the lift lever from the rail via the roller, and the rear or front wheels are jostled by the support shaft that rises together with the lift lever. 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.

After jacking up, there are no obstacles on the tip side of the cantilevered support shaft, so various maintenance operations such as attaching and detaching wheels can be easily performed on the tip side.

(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 as a jack amplifier for, for example, a rear wheel Wr of a motorcycle M in an upright position.

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. . 7
When jacking up the &ta'vV r, the hollow portion of the axle 2 is utilized.

Now, moving on to the structure of the jack J, as shown in Figs.
0a, 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 10a, 10a, and each other end of which is connected to each other outside one end of both end members 10a, 10a, and both vertical members. 10
a, 10a and several horizontal members 10c connecting each of the diagonal members 10b, 10b.
a, a pair of caster type front wheels 11 on the lower surface of the tip of 10a.
11, and one caster type rear wheel 12 is attached to the lower surface of the connection between both diagonal members LOb and IQb. Therefore, the frame IO is supported on the ground G at three points by these three wheels 11, 11, and 12 in total.

As shown in FIG. 4, a fixing table 13 is fixed to the center of the cross member IQc, and an elevating table 14 is disposed above the fixing table 13. 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 body 17 into a screw 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 screw shaft 18 can adjust the height of the support shaft 20 by 1 m by its rotation,
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 IQa and toa and in the direction between the left and right front wheels 11.11.

The upper ends of a pair of lift levers 23, 23 having rollers 24, 24 at their lower ends are pivoted to the left and right sides of the lifting platform 14 via horizontal pivots 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 13 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 larger than the height from the rail 26, 26 to the pivot shaft 25. Therefore, when the lift levers 23.23 are raised, the reaction force exerted by the rails 26.26 on the lift levers 23, 23 via the rollers 24, 24 causes the lifting platform 14 to be moved to the fixed platform 13.
can be pushed upwards.

Although the lift levers 23, 23 can freely swing rearward (toward the rear wheel 12), the lift levers 23, 23 are used to restrict the swinging directly below the pivot shaft 25, that is, forwardly beyond the dead center, to the lessee angle.
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 handle lever 28 which is shaped like an opening and extends rearward for a sufficiently longer length than the lever, and the lift levers 23, 23 are driven by the vertical movement of the handle lever 28. Ru.

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 at the forward swing limit of the lift lever 23 and touch the ground.
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 removed 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 levers 23, 23 in the above-mentioned inclined state. On the other hand, each movement prevention device 1j3
0, the piston 32 is held at the upper limit by the force of the return spring 39, thereby separating the grounding body 34 from the ground G. Therefore, in this state, the handle lever 28
If you squeeze and push and pull, the front wheels 11, 11 and rear wheels 12
The entire Jatsuki J can be moved easily while rolling.

To use it, first, one worker approaches the rear wheel Wr of the motorcycle in an upright position, and another worker approaches the rear wheel Wr of the motorcycle from the side in the same manner as described above, While advancing the materials 10a and 10a to the front and rear of the rear wheel Wr,
Fully insert the support shaft 20 into the hollow part of the axle 2. 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 shaft 25, and the lift levers 23, 23 move the rollers 24, 24 from the rails. 26.26 while rolling, and the reaction force received from the rail 26.26 pushes up the platform 14 together with the rear wheel Wr.
When the lift levers 23, 23 pass the dead center and come into contact with the stoppers 27° 27, the upright state of the lift levers 23, 23 is maintained by the amount of M applied to the lifting platform 14. 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 the wheels 11, 11, and 12, the spring force of the ground spring 37 moves the ground body 34 to the ground G without lifting each wheel 11, 11, 12 from 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 that supports [12
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 motorcycle jack of the present invention includes: a frame having wheels on the lower surface; a fixed base fixed to the center of the frame; a lifting platform supported by the lifting platform so as to be able to rise and fall freely; a support shaft supported in a cantilever manner by the lifting platform and inserted into the hollow axle of the motorcycle; an upper end pivotally connected to the lifting platform by a horizontal pivot; The lower end is equipped with a roller that can roll on a horizontal rail formed on the fixed base, and a lift lever that can move between an inclined position for lowering the elevator platform and an upright position for raising the elevator platform. ; Since it consists of a lever connected to this lift lever, and a handle lever that is longer than the lever, the frame can be moved freely, the support shaft can be easily inserted into the hollow axle of a motorcycle, and one person can The worker can easily jack up the wheel simply by turning the handle lever, and after jacking up, the area around the wheel can be maintained without being disturbed by lifting platforms, etc., especially from the tip of the cantilevered support shaft. can be easily done,
This can greatly contribute to improving the efficiency of maintenance work.

[Brief explanation of the drawing]

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 the line IV-rV in FIG. 3, and FIG. 5 is a sectional view taken along the line V-V in FIG. 4. j... Jacket, M... Motorcycle 2... Hollow axle, 10... Frame, 11... Front wheel as a wheel, 12... Rear wheel as a wheel, 13... Fixed base ,1
4... Lifting platform, 20... Support shaft, 23... Lift lever, 24... Roller, 25... Pivot, 26...
Rail, 28...handle lever

Claims (1)

[Claims] A frame equipped 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 move up and down; A cantilever on the lifting table; A support shaft that is supported by a shaft and inserted into the hollow axle of a motorcycle; the upper end is pivotally connected to the lifting platform by a horizontal pivot, and the lower end rolls on a horizontal rail formed on the fixed platform. a lift lever that is equipped with a roller capable of swinging and can swing between an inclined position for lowering the platform and an upright position for raising the platform; a handle lever connected to the lift lever and having a longer length than the lever; A motorcycle jack that is characterized by: