JPH08333094A - Lift for servicing vehicle - Google Patents

Abstract

PURPOSE: To provide an auxiliary mechanism to smoothly rise a double stage system X-type expansion mechanism when such mechanism is lifted up from the completely collapsed condition. CONSTITUTION: A rising and falling arm 8 is mounted pivotably to a base 1 about a fulcrum of the axis of a pivot 9 attached pivotably to an outside link 3a. The tip of the rising and falling arm 8 and a crossing shaft 12 are interconnected through a connecting lever 11. The connecting lever 11 has a slot 11a in the tip and the crossing shaft 12 of the underside Y-type link is inserted into the slot 11a to slide relatively along the slot 11a. Also, in the rising and falling arm 8, one end of a cylinder mechanism 10 having the other end attached pivotably to the vicinity of a slide part to a table 2 of the upper side X-type link 4 is pivotably attached to a position displaced longitudinally of the rising and falling arm 8 from the pivotal center through a bracket 8a pivotable integrally with the rising and falling arm 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has an X-shaped expansion / contraction mechanism formed by intersecting links in an X shape between a base and a table, and one lower end of the X-shaped expansion / contraction mechanism is set to the base. And the other lower end is slidably provided along the base, and one upper end of the X-shaped expansion / contraction mechanism is pivotally attached to the rear end of the table and the other upper end thereof. The present invention relates to a vehicle maintenance lift in which a section is slidable along the back surface of a table and the table is lifted and lowered by the opening / closing operation of the X-type expansion / contraction mechanism.

[0002]

2. Description of the Related Art The X-type telescopic mechanism can be folded compactly to reduce the minimum ground clearance, and especially when it is a two-stage type, it is possible to gain height during lift-up.
It is often used in vehicle maintenance lifts. However, when the X-shaped expansion / contraction mechanism is folded until each link becomes horizontal in order to minimize the height during liftdown,
The cylinder that applies the expansion force to the X-type expansion and contraction mechanism is also in a horizontal posture, and the extension force of the cylinder hardly acts as a vertical component force when the cylinder is started up. Therefore, conventionally, for example, as described in Japanese Utility Model Laid-Open No. 63-166595, an arm (cam) is provided at the pivotal attachment portion of the link, and an auxiliary mechanism for pushing up the roller attached to the upper link by the arm is provided. Have been proposed.

[0003]

In such an auxiliary mechanism, after the link is opened by a predetermined angle and the roller is separated from the arm, it is necessary to regulate the arm not to rotate more than a certain angle. Conventionally, since a cam contact is provided on the link and the rotation angle of the arm is regulated by the cam contact, both the center of rotation of the arm and the cam contact attachment portion are located at the intermediate portion of the link, Excessive stress concentrates too much on the cam surface, causing link durability. Further, since a large number of members are assembled in a narrow space, an assembling space is required, and the contact surface of the arm against the cam contact is required to have high accuracy, rigidity, and wear resistance, and assembly is complicated.

[0004]

SUMMARY OF THE INVENTION The present invention is to provide a vehicle maintenance lift which has a simple mechanism and is highly reliable in rising operation, and has a structure in which one end of a hoisting arm is connected to the base with an X-shaped link. Is rotatably attached with the axis of the pivot shaft pivotally attached as a fulcrum, and one end of the cylinder mechanism is pivotally attached to a portion displaced from the rotation center to the diagonally upper side in the longitudinal direction of the undulating arm, The other end of the cylinder mechanism is pivotally attached to a portion of the X-type link in the vicinity of the sliding portion with respect to the table, and the X-type extension / contraction mechanism is provided with a push-up member that abuts the upper edge of the undulating arm. This is because a stopper is provided at the tip of the arm to regulate the undulating arm by pulling it to the other side. And, the X-shaped expansion mechanism is X
The die link may be of a two-stage type in which upper and lower stages are connected to each other, and the pushing-up member may be a cam roller which is brought into contact with an arcuate cam surface formed on the upper edge of the undulating arm. The stopper may have one end pivotally attached to the tip of the undulating arm, and the cross shaft of the lower X-shaped link may be inserted into a slot formed in the other end of the undulating arm. The shaft can be inserted into a shaft insertion hole provided in the shaft, and a locking portion can be provided at the tip of the hole.

[0005]

When the cylinder is operated with the link completely folded, the hoisting arm rotates about the axis of the pivot shaft that pivotally mounts the X-shaped expansion mechanism with respect to the base.
The push-up member is pushed up, whereby the X-shaped expansion / contraction mechanism is expanded. When the undulating arm rotates by a predetermined angle, the undulating arm is pulled by a stopper to restrict the rotation, and then the X-shaped expansion / contraction mechanism is directly expanded by a cylinder. The stopper means based on the pulling operation is formed by a undulating arm and a stopper, and a triangle connecting, for example, a link connecting the other ends of the undulating arm and the stopper. It can be said that the structure is ideal.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle maintenance lift according to the present invention in which a two-stage structure is adopted for an X-type telescopic mechanism will be described with reference to the drawings. 1 and 2, 1 is a base, 2 is a table 2 disposed above the base, and an outer link 3a and an inner link 3b are formed in an X shape between the base 1 and the table 2. Lower X-shaped link 3 crossed
And an upper X-shaped link 4 in which an outer link 4a and an inner link 4b are crossed in an X shape, are connected in a two-stage structure, and a two-stage X-shaped expansion and contraction mechanism 5 has a space between them. They are kept and arranged in parallel. In each of the two-stage X-type expansion and contraction mechanism 5, the lower end portion of the outer link 3a of each lower X link 3 is pivotally attached to the end portion of the base 1, and the inner link 3
The lower end of b is slidably attached along the base 1,
The upper end of the outer link 4a of each upper X-shaped link 4 is pivotally attached to one end of the back surface of the table 2, and the upper end of the inner link 4b is slidable along the back surface of the table 2. The table 2 is moved up and down by the opening / closing operation of the two-stage X-type telescopic mechanism 5.
In addition, rolling rollers 5a, 5a, ... Are attached to the sliding tips of the inner links 3b, 4b. In the lower X-shaped link 3, the intersection of the outer link 3a and the inner link 3b is located above the center, and in the upper X-shaped link 4, the intersection of the outer link 4a and the inner link 4b is located. They intersect at a portion lower than the center, and the connecting ends of both links 3 and 4 are always located inside the pivoting end and the sliding end.

A device for raising and lowering the table 2 by the opening and closing operation of the two-stage X-type telescopic mechanism 5 is a set of two groups, and the inner links 3b, 3b located near the center of the devices arranged in parallel with each other. The lower end portions are connected to each other by the connecting shaft 6, and the connecting shaft 6 is covered with the pressing lid 7 so that the table 2 does not fall down to one side (pivot side) even if an unbalanced load is applied (Fig. 3). Although such a fall prevention function is not shown in the figure, for example, a roller is attached to the lower end portion of each inner link of the lower X-shaped link, and the rollers are provided on both sides of the base, respectively, in a U-shaped rail. It is also possible to adopt a structure in which is rolled in the locked state.
Further, an undulating arm 8 is rotatably attached to the base 1 about an axis of a pivot shaft 9 that pivotally mounts the outer link 3a to the base 1. One end (rear end of the cylinder) of each of the pair of cylinder mechanisms 10, 10 is pivotally attached to a portion of the undulating arm 8 which is displaced obliquely upward in the longitudinal direction via a bracket 8a which rotates integrally with the undulating arm 8. The other ends (tips of piston rods) of the cylinder mechanisms 10, 10 are pivotally attached to the sliding tip of the upper X-shaped link 4 with respect to the table 2.
The tip end of the undulating arm 8 has a long hole 11a as a stopper as a stopper, and the cross shaft 12 of the lower X-shaped link is relatively arranged along the long hole 11a in the long hole 11a. A plate-shaped connecting rod 11 that is movably inserted into is pivotally attached. Further, an arcuate cam surface 13 is provided on the upper longitudinal edge of the undulating arm 8, and the lower end of the upper X-shaped link 4 abuts the cam surface 13 when the table 2 is at a low position. A roller 14 as a push-up member is provided.

In the vehicle maintenance lift thus constructed, the lower X-shaped link 3 and the upper X-shaped link 4 are arranged inside and outside when the two-stage X-shaped telescopic mechanism 5 is completely folded. Since the upper and lower X-shaped links 3 and 4 are vertically overlapped with each other, the table 2 can be lowered to a height approximately twice the link width, as shown in FIG.
Also, in this folded state, the lower X-shaped link 3 and the upper X-shaped link 3 are
Since the connecting ends of the X-shaped links 4 are located inward of the pivoting ends and the sliding ends of the X-shaped links 3 and 4, there is one end between the pivoting ends and the sliding ends. Even if the connecting shafts of the book are penetrated, they do not interfere with the shafts and are reasonably accommodated between the base and the table. Since one end of the cylinder mechanism 10 is pivotally attached to the undulating arm 8 at a portion displaced from the center of rotation of the undulating arm 8 obliquely upward in the longitudinal direction, the cylinder mechanism 10 is extended in the lift-down state. When operated, first, as shown in FIGS. 5A and 5B, the undulating arm 8 rotates to push up the roller 14, whereby the two-stage X-type telescopic mechanism 5 expands. The contact position between the roller 14 and the cam surface 13 depends on the rotation of the hoisting arm 8 and the two-stage X
When the crossing shaft 12 of the lower X-shaped link reaches the end of the elongated hole 11a and the stopper function is activated, the undulating arm 8 is rotated. Motion is stopped. Then, the extension operation of the cylinder mechanism 10 is a two-stage X
The two-stage X-shaped expansion / contraction mechanism 5 is further expanded by directly acting on the expansion / contraction mechanism 5. The cam surface 13 is a cylinder mechanism 1.
When the extension force of 0 begins to act directly on the two-stage X-type expansion and contraction mechanism 5, the curve is set so that the pushing force does not substantially act on the roller 14, and the roller 14 moves away from the cam surface 13.
It is desirable to design so as to switch smoothly when shifting to direct drive.

Since the undulating arm is supported by pulling, stress is not concentrated on the pivotal end of the link with respect to the base, which is highly reliable. In the stopper mechanism of the embodiment, the shaft inserted into the elongated hole of the connecting rod reaches the end portion and exerts a stopper function, but the opposite, that is, although not shown, is undulated in the elongated hole of the connecting rod. A pin provided at the tip of the arm can be inserted, or a long hole can be formed in the link, and a pin provided at the front end of the connecting rod can be inserted into the long hole. or,
As illustrated in FIG. 7, one end is pivotally attached to the tip end of the undulating arm 8 and the other end is inserted into a shaft insertion hole 12a provided in the cross shaft 12 of the lower X-shaped link, and at the most distal end thereof. A rod-shaped connecting rod 11 'provided with the locking portion 11b can be adopted. Further, the object to which the connecting rod is connected is selected from the base or other fixed objects other than the intersecting axis of the link. The position at which the push-up member is provided is not limited to the upper X-shaped link, and is selected from an appropriate position of the two-stage X-shaped expansion / contraction mechanism 5, and the push-up member is formed at the upper edge of the undulating arm. In addition to the roller that comes into contact with the cam surface, the cam surface that comes into contact with the roller provided on the undulating arm can be used.

The embodiments merely show the minimum necessary basic structure of the present invention. A drop prevention mechanism is provided to prevent the table from lowering even if the hydraulic pressure is reduced, or the end of the table is provided. A board or an extension member can be added, and the table can be installed in the floor so that the table is flush with the floor during the lift-down. Further, it is also possible to use only one device for lifting and lowering the table 2 by the opening / closing operation of the two-stage X-type expansion / contraction mechanism 5 instead of a set of two devices.

Further, the X-type expansion and contraction mechanism of the embodiment has upper and lower X
The type links have a relationship between the inside and the outside, and each of the X-type links has a two-stage structure that vertically overlaps, but all the links can be folded on the same line, and the outside links and the inside links The structure of the X-type link is not limited to that of the embodiment, such as the reverse combination of and the one-stage type or the three-stage type structure, and the cylinder mechanism also has the piston rod directed downward. Or the pivotal position of the upper X-shaped link may be changed such that it is slightly separated from the sliding end of the table.

[0012]

According to the present invention, the X-type expansion / contraction mechanism can be smoothly started up from the completely folded lift-down state, and the highly reliable stopper mechanism is arranged in a small space. Miniaturized and extremely rational.

[Brief description of drawings]

FIG. 1 shows an embodiment of a vehicle maintenance lift according to the present invention,
It is a side surface explanatory view shown in the lift-up state.

FIG. 2 is an explanatory plan view showing a vehicle maintenance lift without a table.

FIG. 3 is an explanatory diagram of a sliding portion with respect to a base of the link.

FIG. 4 is an explanatory diagram of a lift-down state in which the two-stage machine X-type telescopic mechanism is completely folded.

5A and 5B are explanatory diagrams of the operation of the undulating arm at the time of rising.

FIG. 6 is an explanatory diagram of a lift-up operation.

FIG. 7 is an explanatory diagram showing a modified example of a stopper.

[Explanation of symbols]

1 ... Base, 2 ... Table, 3 ... Lower X-shaped link, 3a ... Outer link, 3b ... Inner link, 4 ...
Upper X-type link, 4a..Outer link, 4b..Inner link, 5..Two-stage type machine X-type expansion / contraction mechanism, 5a..Rolling roller, 6 ... Connecting shaft, 7 ... Pressing lid, 8 ..Holding arm, 8a..Bracket, 9..Pivot shaft, 10..Cylinder mechanism, 11, 11 '.. Connecting rod, 11a ..
11b ··· Locking part, 12 ··· Cross shaft, 12a · · Shaft insertion hole, 13 · · Cam surface, 14 · · Roller.

Claims (5)

[Claims] 1. An X formed by intersecting links in an X shape.
The mold expansion mechanism is arranged between the base and the table, and
One lower end of the mold expansion and contraction mechanism is pivotally attached to the base, and the other lower end is slidably provided along the base.
Further, one upper end of the X-shaped expansion / contraction mechanism is pivotally attached to the end of the back surface of the table, and the other upper end is slidable along the back surface of the table. In a vehicle maintenance lift that raises and lowers a table by an opening and closing operation, one end of a hoisting arm is rotatably attached to the base with an axis of a pivot shaft pivotally attaching an X-shaped link as a fulcrum. One end of the cylinder mechanism is pivotally attached to the portion displaced from the center of motion to the upper side in the longitudinal direction of the undulating arm, and the other end of the cylinder mechanism is
A push-up member that is pivotally attached to a portion of the X-shaped link near the sliding portion with respect to the table, and a push-up member that comes into contact with the upper edge of the undulating arm is provided in the X-shaped expansion / contraction mechanism. A vehicle maintenance lift equipped with a stopper that restricts the arm by pulling it to the other side. 2. The vehicle maintenance lift according to claim 1, wherein the X-shaped expansion / contraction mechanism is a two-stage type in which X-shaped links are vertically connected in two stages. 3. The vehicle maintenance lift according to claim 1, wherein the pushing-up member is a cam roller, and the cam roller is brought into contact with an arcuate cam surface formed on an upper edge of the undulating arm. 4. The stopper according to claim 1, wherein one end of the stopper is pivotally attached to the tip of the undulating arm, and the cross shaft of the X-shaped expansion / contraction mechanism is inserted into a slot formed at the other end.
The vehicle maintenance lift according to any one of 1. 5. The stopper has one end pivotally attached to the tip end of the undulating arm, and the other end inserted into a shaft insertion hole provided in a cross shaft of the X-shaped expansion / contraction mechanism, and the locking portion is provided at the leading end thereof. The vehicle maintenance lift according to any one of claims 1 to 3, further comprising: