KR20030023436A - Swing Arm of Lift for Maintenance of Automobile - Google Patents

Abstract

PURPOSE: To adjust the height of a vehicle receiving bed with a single motion. CONSTITUTION: A vehicle receiving bed 2 is mounted at a tip end of a swing arm 1 through an X-shaped parallel link mechanism 8. A cam shaft 12 is laid between one side link plates 9, 9 in the X-shaped parallel link mechanism 8. An involute cam 13 is provided at a center portion of the cam shaft 12, and a knob 14 is provided at a projecting portion in one side. An inclining surface 18 capable of pressing on a cam surface of the involute cam 13.

Description

Swing Arm of Lift for Vehicle Maintenance {Swing Arm of Lift for Maintenance of Automobile}

The present invention relates to a swing arm having a vehicle pedestal for supporting the vehicle at the tip, which enables lifting movement and horizontal rotation at any height.

The vehicle pedestal provided at the tip of the swing arm needs height adjustment depending on the type of vehicle to be lifted up.

Thus, in the related art, for example, as illustrated in FIG. 7, the support shaft 24 having a male screw protruding from the lower surface of the vehicle pedestal 2 is provided in the ehls arm screw hole 23 at the tip of the swing arm 1. ), The height of the vehicle stand 2 can be adjusted by screw feed operation.

As for the swing arm which can adjust the height of a vehicle stand by a screw feed operation, the adjustment allowance of a vehicle stand is determined by the length of a support shaft.

It is preferable that the adjustment allowance is larger so that the height of the lifting point can correspond to various vehicles, but when the support shaft becomes long, the support shaft protrudes greatly under the swing arm when the vehicle support is lowered to support the swing arm. The lower end of the shaft cannot be lowered than immediately before contacting the floor, and it is difficult to secure stability when the vehicle stand is raised.

In addition, because the screw feed type, the operation takes a long time because the number of times to rotate relative to the height of adjustment is difficult and difficult to turn.

In addition, although the support shaft has a double telescope structure inside and outside, the support shaft is designed to be reduced when the vehicle stand is lowered. It is also possible to prepare a plurality of different support shafts and replace them as necessary.

The present invention provides a swing arm of a vehicle maintenance lift that has a large height adjustment margin of the vehicle stand and can be lowered until it comes in contact with the floor, and has excellent stability and workability. Connecting with a parallel link mechanism, having a cam mechanism for supporting the vehicle pedestal at an arbitrary position by preventing the contracting motion of the X-type parallel link mechanism, and connecting the swing arm and the pedestal with the X-type parallel link mechanism, A ratchet mechanism for preventing the contracting operation of the X-type parallel link mechanism and supporting the vehicle pedestal at an arbitrary position is provided.

In the former swing arm, the cam mechanism is provided with a rotary cam on one link plate whose lower end in the X-type parallel link mechanism is rotatably attached to the swing arm, and the cam surface of the rotary cam with respect to the swing arm. It is preferable that it can be assembled so that a pressurization operation is possible, and at least any one of the contact surfaces of a cam surface and the cam in a swing arm was slip-resistant.

In the latter swing arm, the ratchet mechanism includes a ratchet claw provided on the lower end portion of the other link plate that moves along the swing arm in the X-type parallel link mechanism, and the lower end of the other link on the swing arm. It can be comprised by the ratchet tooth arrange | positioned in parallel with the guide which guides along.

Also, in either swing arm, it is preferable to give the X-type parallel link a spring force for preventing the X-type parallel link from contracting by the weight of the vehicle pedestal.

1 is a perspective view showing a swing arm of a first embodiment according to the present invention;

2 is an explanatory diagram showing a swing arm of a first embodiment according to the present invention;

3 is an explanatory diagram of the swing arm in the first embodiment according to the present invention;

4 is a perspective view showing a swing arm of a second embodiment according to the present invention;

5 is an explanatory diagram showing a swing arm of a second embodiment according to the present invention;

6 is an operation explanatory diagram of a swing arm in a second embodiment according to the present invention.

7 is an explanatory diagram of a conventional example.

<Description of the symbols for the main parts of the drawings>

1 swing arm 1a pedestal mounting portion

2: vehicle stand 3: base

4: seat plate 5: rubber pad

6, 7: Guide groove 8: X type parallel link mechanism

9, 10: link plate 11, 15: torsion spring

12: camshaft 13: involute cam

14 knob 16 recessed portion

17: protrusion 18: inclined surface

19: axis of rotation 20: ratchet claw

21 knob 22 ratchet teeth

23: female thread hole 24: support shaft with male thread

The swing arm of the vehicle maintenance lift which concerns on this invention is demonstrated based on drawing.

1 and 2 show the tip portion of the swing arm of the first embodiment, wherein the tip of the swing arm 1 is roughly half the thickness of the swing arm 1 compared with the other portions of the swing arm. A narrow pedestal mounting portion 1a is formed in the seat, and the vehicle pedestal 2 is assembled to the pedestal mounting portion 1a.

The vehicle pedestal 2 has a seat plate on a thick plate-shaped base 3 having a width narrow portion formed at a proximal end so as to be symmetrical with the pedestal mounting portion 1a. The rubber pad 5 is attached with 4) in between, and the guide groove 6 as a guide is formed in the both sides of the part which is not narrow.

On the other hand, guide grooves 7 as guides are formed on both sides of the narrow portion of the pedestal mounting portion 1a.

8 and 8 are X-shaped parallel link mechanisms formed by cross-linking a pair of link plates 9 and 10 at the center and rotatably attaching the centers of the cross-linked portions. 9, the lower end is rotatably attached to the side of the pedestal mounting portion 1a and the upper end is free to slide along the guide groove 6 with respect to the guide groove 6 formed on the side of the base 3. Each of which is connected to a slider, and the other link plate 10 is rotatably attached to the side of the base and the lower end is formed on the side of the pedestal mounting portion 1a so as to be symmetrical with the link plate 9. A slider is connected to the groove 7 so as to slide along the guide groove 7.

In the X-type parallel link mechanism 8, a torsion spring 11 that applies a spring force to the extension side of the link plates 9 and 10 is assembled.

Moreover, between the link plates 9 and 9 arrange | positioned at both sides, the camshaft 12 is provided in the state below the center, and the one end part protruded to the side, and the camshaft 12 rotates in the center part. A cam (hereinafter referred to as an involute cam) 13 using an involute curve as a cam is provided so as to be rotatable integrally with the cam shaft 12, and the cam is provided at the tip of the protrusion with respect to the knob 14 and the cam shaft 12. A torsion spring 15 is provided for giving a force to rotate toward a larger diameter. On the cam surface of the involute cam 13, a fine uneven surface is formed as an anti-slip treatment.

Moreover, the recessed part 16 and the protrusion 17 are continuously provided in the upper surface of the pedestal mounting part 1a, and it is mentioned in the section from the bottom of the recessed part 16 to the top of the protrusion 17 above. An inclined surface 18 in contact with the involute cam 13 is formed.

Next, in the swing arm formed as described above, an example of adjusting the height of the vehicle pedestal will be described. In order to raise the height of the vehicle pedestal 2, when the base 3 is lifted up, (a), (b), As shown in (c), the X-type parallel link mechanism 8 follows the movement of the base 3 while the ends of each link plate 9, 10 move along the guide grooves 6, 7, respectively. If the involute cam 13 is to be removed from the inclined surface 18 by the motion of the X-type parallel link mechanism 8, the involute cam 13 is also cam surface by the force of the torsion spring 15. It rotates so that the inclined surface 18 may contact.

Therefore, even if you take your hand off at any height, the involute cam 13 is maintained in a latched state in which the cam surface is pressed against the inclined surface 18. On the contrary, when lowering the vehicle stand 2, by turning the knob 14, the cam surface of the involute cam 13 is removed from the inclined surface 18, and the base 3 is pushed down in such a state that the vehicle is operated in the reverse operation. When the base can be lowered and the hand is released from the knob 14, the cam surface of the involute cam 13 is pressed against the inclined surface 18 and brought into a latching state.

The swing arm formed in this way can be adjusted in one touch only by lifting the vehicle stand or pushing the knob to push it down, and the unique structure of the X-type parallel link mechanism allows the vehicle stand to have high height adjustment and high stability. .

In addition, even if the vehicle support is lowered, since there is no protrusion at the bottom, the swing arm can be lowered to the lowest position, which can correspond to most vehicles.

In addition, in this 1st invention, the anti-slip process performed on a cam surface can also be changed into a tooth | gear or a knurling process, or can also be provided in the inclined surface 18. FIG. In one embodiment, since the involute cam is provided on the link plate and the cam surface is brought into contact with the inclined surface provided on the vehicle pedestal mounting portion, the assembly is facilitated by a rational combination, but the cam and the inclined surface are reversely arranged, eg For example, the center of the pedestal mounting portion is cut out and the involute cam is disposed thereon, while the inclined surface is provided on the hydraulic member provided between the left and right X-type parallel link mechanisms, or the vehicle pedestal and the link plate Even if it is arrange | positioned mutually or between the link plates which comprise one X-type parallel link mechanism, it does not interfere, and rotary cams employ various rotary cams, such as a cam using a trochoid curve other than an involute cam, for example. can do.

In addition, although the recessed part 16 and the protrusion 17 were continuously provided in the pedestal mounting part 1a in the Example, the pedestal mounting part 1a is not provided without providing the recessed part 16 and the protrusion 17. As shown in FIG. It is ok to receive the cam directly from the top of the.

Although the first embodiment has a hooking function using a cam, it is possible to obtain the same effect even with a ratchet mechanism, so that the second embodiment using the ratchet mechanism will be described next.

4 and 5 showing the second embodiment also show the tip portion of the swing arm as in the first embodiment, and the same reference numerals as those in the first embodiment are used for the same functional parts as the first embodiment. The same sign as was used.

The swing arm 1 is a telescope-type telescopic type in which the front part is freely drawn out of the main body. The front end part is provided with a vehicle pedestal attaching part 1a having a front light emitting part at the tip end thereof. The vehicle stand 2 is assembled to the mounting portion 1a with the X-type parallel link mechanism 8 interposed therebetween.

Since the vehicle pedestal 2 and the X-type parallel link mechanism 8 have already been described in Embodiment 1, detailed description thereof will be omitted.

In the X-type parallel link mechanism 8, a state in which the rotary shaft 19 protrudes the end portions on both sides between the lower ends of the other link plates 10 and 10 whose lower ends move along the swing arm 1. The ratchet claw 20 is provided at one protruding end of the rotary shaft 19, and the knob 21 is provided at the other protruding end thereof.

On the other hand, one side surface of the pedestal mounting portion 1a has a ratchet tooth that prevents widening of the X-type parallel link mechanism 8 by engaging with the ratchet claw 20 in parallel with the guide groove 7. 22 is provided integrally, and spring force is applied to the rotation shaft 19 in a direction in which the ratchet claws 20 are to engage the ratchet teeth 22.

In the swing arm comprised in this way, the height adjustment example of the vehicle stand is demonstrated. In order to raise the height of the vehicle stand 2, when the base 3 is lifted up, the other in the X-type parallel link mechanism 8 is carried out. The link plate 10 of the ratchet claw 20 moves the ratchet claws 20 in a direction in which the ratchet teeth 22 ride one tooth over each other so that the vehicle pedestal 2 can be raised in the order of (a), (b), and (c). When it becomes desired height, it will be in a hanging state only by removing hand from base 3.

On the contrary, when lowering the vehicle stand 2, as illustrated in FIG. 6B, when the knob 21 is rotated to release the ratchet mechanism, the base 3 can be pushed out. Wages can be lowered in the reverse order, and the ratchet claws 20 mesh with the ratchet teeth 22 when the knob 21 is released.

The swing arm formed as described above can be height-adjusted by one-touch operation only by lifting the vehicle stand or operating the knob to push down, whereby the same effect as in the first embodiment is achieved.

The ratchet mechanism of this embodiment consists of a ratchet claw 20 provided at the bottom of the link plate 10 and a ratchet tooth 22 arranged in parallel with the guide groove 7 in the pedestal mounting portion 1a, but the link plate Ratchet teeth having the shaft attached to the main shaft rotatably attached thereto, and ratchet teeth provided at the shortest link plate, and side surfaces of the base or pedestal mounting portion to which the link plate is rotatably attached. It can also consist of ratchet claws.

In this embodiment, the ratchet teeth (including the ratchet claws) are provided only on one side of the pedestal mounting portion, but can be provided on both sides to increase the reliability, and both embodiments employ handles or levers instead of knobs. can do.

The swing arm of the present invention has the main object of enabling one-touch adjustment of the vehicle pedestal by effective use of the cam mechanism or the ratchet mechanism while making the most of the merits of the X-type parallel link mechanism, and changing the shape of the pedestal mounting portion. Alternatively, the X-type parallel link mechanism may be rotatably assembled so as to be rotatable opposite to the attaching side and the slider connecting side, such that the above object of the present invention can be achieved.

Advantageous Effects of Invention According to the present invention, it is strong and stable, and the lowering height of the lift arm is not limited, and above all, the operability is excellent and the height can be adjusted quickly.

And a ratchet claw provided at the lower end portion of the other link plate moving along the swing arm in the X-type parallel link mechanism or a structure for assembling the cam surface of the rotary cam provided on one link plate with respect to the swing arm. Since the lower end of the other link is assembled so as to be engaged with the ratchet teeth arranged in parallel with the guide guided along the swing arm, the assembly can be facilitated by rational arrangement, and the cam face and the cam face are in contact with each other. If the anti-slip treatment is applied to any one, high frictional force can be secured and reliability at the time of increase is increased.

In addition, by providing a spring force that prevents the X-type parallel link mechanism from contracting due to the weight of the vehicle stand, the X-type parallel link mechanism reduces the force for pushing up the vehicle stand during the height adjustment work. can do.

Claims (6)

A swing arm having a vehicle support for supporting a vehicle at the tip, capable of lifting and moving horizontally at any height, And a cam mechanism for connecting the swing arm and the pedestal with an X-type parallel link mechanism and preventing the contracting motion of the X-type parallel link mechanism to support the vehicle pedestal at an arbitrary position. Swing arm. The method of claim 1, The cam mechanism is assembled so that the lower end of the X-type parallel link mechanism is provided with a rotary cam on one link plate rotatably attached to the swing arm, and is capable of pressing the cam surface of the rotary cam against the swing arm. A swing arm for a vehicle maintenance lift. The method according to claim 1 or 2, A swing arm for a vehicle maintenance lift, wherein an anti-slip treatment is performed on at least one of a contact surface between a cam surface and a cam on a swing arm. A swing arm having a vehicle support for supporting a vehicle at the tip, capable of lifting and moving horizontally at any height, A swing support for a vehicle maintenance lift provided with a ratchet mechanism for connecting the swing arm and the pedestal with an X-type parallel link mechanism and preventing the contracting operation of the X-type parallel link mechanism to support the vehicle pedestal at an arbitrary position. Arm. The method of claim 4, wherein The ratchet mechanism is arranged in parallel with a ratchet claw provided at the lower end of the other link plate moving along the swing arm in the X-type parallel link mechanism, and a guide for guiding the lower end of the other link along the swing arm. Swing arm of a vehicle maintenance lift comprising a ratchet tooth. The method according to any one of claims 1 to 5, A swing arm of a vehicle maintenance lift, wherein the X-type parallel link mechanism is provided with a spring force that prevents the X-type parallel link mechanism from contracting by the weight of the vehicle stand.