JPH0977482A - Lift for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lift a table stably in a horizontal manner at all times by installing a cam that is formed so as to make the table be horizontally maintained usually at the time of its lifting motion, in a part of link mechanism, in a lift which makes the table, where a vehicle is mounted, go up and down by the link mechanism. SOLUTION: In a state that a table 10 is stored in a pit P, if a lifting cylinder 80 is driven and a piston rod 81 is extended into operation, link mechanism L1 consisting of a long arm 20, a short arm 40 and an equilibrium link rod 70 works and this table 10 is thereby lifted upward. At this time, a cam roller 61 of a link plate 60 comes into rollingly contact with the external contour of a cam 50, thereby controlling any motion of the equilibrium link rod 70. In brief, in time of ascension, large tension is imposed on the equilibrium link rod 70, but this tension is transmitted to the cam roller 61 via the link plate 60, and since the cam roller 61 travels along the form of a specific trajectory of an outer circumferential surface 50a of the cam 50, the table is always kept in horizontal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle lift for mounting and elevating a vehicle for repair or inspection.

[0002]

2. Description of the Related Art A link mechanism is incorporated under a table on which a vehicle is mounted, and the link mechanism is driven by a lifting cylinder or the like to lift the table. Have been proposed.

[0003]

This type of vehicle lift has a small installation space, enables the overall size of the device to be compact, and is relatively structurally simple and has excellent usability. In the table portion, there is a problem that the table does not always keep horizontal and does not move up and down, but rises with a slight wave. If there is such a wavy phenomenon (rocking phenomenon) of the table, of course, the wavy phenomenon is seen even in the vehicle mounted on the table, and when the vehicle is raised, the level of the vehicle is not maintained,
There is a risk that the vehicle may shift to the lower side, it is dangerous, and it is difficult to work, and at the same time it gives the worker an uncomfortable feeling, and at the same time, in the structural parts such as each shaft support part of the link mechanism,
There was a problem such as inconvenience that excessive force was applied.

As a method for preventing such a table undulation phenomenon, for example, a vehicle lift as shown in FIG. 8 has been partially proposed (Kaikaihei 6-80790). In this vehicle lift, below the table 1 on which the vehicle is mounted,
Long arm 2, short arm 3, push rod 4
The link mechanism L _{0 including the above} is incorporated and driven by the lifting cylinder 5 or the like to lift and lower the table 1. In this case, the link mechanism L ₀ is
It has a one-step structure based on one long long arm 2, and when the table 1 moves up and down, a wavy phenomenon occurs,
A roller 6 axially supported on the lower end of the long arm 2 is rolled on a corrugated rail 7 to prevent the corrugation phenomenon of the table 1.

However, in this lift structure, there is a problem in that the table 1 cannot be lifted vertically and is slightly displaced in the front-rear direction, resulting in lack of stability. In addition, the rail 7 for maintaining the level becomes a fairly large component, which causes a problem of cost increase.

The present invention has been made in view of such conventional problems. A cam having a special shape is provided in a part of the link mechanism, and the function of the cam causes the table to move up and down. It is intended to provide a vehicle lift in which the vehicle is always maintained horizontally and can be vertically moved up and down.

[0007]

[Means for Solving the Problems] The means of the present invention is
In a vehicle lift in which a table on which a vehicle is mounted is lifted and lowered by a link mechanism driven by a lifting means, a part of the link mechanism keeps the table always horizontal when the table is lifted and lowered. A vehicle lift characterized in that a cam formed as described above is provided.

According to a more specific means of the present invention, one end is rotatably supported by a table on which a vehicle is mounted, and
A long arm whose other end moves on a laying rail in a pit through a rotating roller, and one end of which is rotatably supported in the middle of the long arm and the other end of which is a free end of the long arm of the laying rail. A short arm that is rotatably supported on the side opposite to the side, a cam that is mounted on the fulcrum of the short arm and the long arm, and a cam roller that is in rolling contact with the cam that is rotatably supported at one end. A link plate whose other end is rotatably supported in the middle of the short arm, one end rotatably supported in the middle of the link plate, and the other end rotatably supported by the table. And a lifting means such that a free end side of a lifting rod such as a lifting cylinder is rotatably supported in the middle of the long arm, and the outer shape of the cam is driven by the lifting means. When lifting the Buru, in a vehicle lift, characterized in that the table is formed so as to be horizontally maintained at all times.

[0009]

1 to 4 show one embodiment of a vehicle lift according to the present invention, and FIGS. 5 to 7 show its operation. In the figure, 10 is a table on which a vehicle is mounted, 20 is rotatably supported at one end on the table 10, and the other end moves on a laying rail 30 in the pit P via a rotating roller 21. The S-shaped long arm 40 has a length approximately half that of the long arm 20. One end of the long arm 20 is rotatably supported in the middle (almost center portion) of the long arm 20, and the other end is laid on the laying rail 30. The short arm rotatably supported on the side opposite to the free end side of the long arm 20, 50 is a cam mounted on the shaft fulcrum (central axis) A of the short arm 40 and the long arm 20, and 60 is the cam 50. A cam roller 61 rollingly contacting with the one end is rotatably supported at one end, and the other end is rotatably supported in the middle of the short arm 40. A balance link rod 80, one end of which is rotatably supported by a member 71, and the other end of which is rotatably supported on the table 10 by a female screw member 72 for rod length adjustment. Is a lifting rod 81 in the middle of the long arm 20.
A free end side of which is rotatably rotatably supported, for example, an elevating cylinder in which the elevating rod 81 is a piston rod (a driving means such as a motor in which the elevating rod 81 is a rotating elevating screw rod is also possible), and 90 is a gutter shape Elevating means 8 inside
0 is stored and mounted, and lock tooth members 91 for preventing slippage are formed on the upper surfaces of the left and right gutter side plates,
Reference numeral 100 denotes a gutter shape on the slip prevention lock tooth member 90, one end of which is pivotally supported in the middle of the long arm 20 together with the elevating rod 81 of the elevating means 80 while covering the elevating rod 81. Locking claws 101, 101, which are covered and provided on the inner side of the other ends, are slip-preventing locking claw mounting members that engage with the lock teeth 91, 91.

In each of these configurations, the long arm 2
0, the short arm 40, the balance link rod 70, etc. constitute the link mechanism L ₁ of the present invention, and this link mechanism L ₁ has two left and right tables 10, 10 as is apparent from FIG. In the lower part, since two pieces are symmetrically arranged on the left and right of the elevating means 80, a total of four pieces are incorporated. Therefore, again, the cam 50 and the link plate 6
There are 0, cam rollers 61, etc., which are four in total. In the pit P portion between the left and right tables 10 and 10, when the lifting means 80 is a lifting cylinder, a hydraulic box 110 accommodating a hydraulic system is installed. Of course, when the elevating means 80 is a drive means such as a motor, the drive box 110 accommodating the motor drive system is installed.

According to the vehicle lift having the above structure,
For example, as shown in FIG.
In a state where 0 and 10 are stored (start position, H ₀ ), if the lifting cylinder 80 of the lifting means is driven and the piston rod 81 is extended, a total of four link mechanisms L are obtained.
₁ , the tables 10 and 10 are sequentially raised, and finally, to the top position (H ₁₈₀₀ ) which is the final reaching point of the height of 1800 mm, for example. At the time of this rising, the lock claw 10 of the lock claw mounting member 100 for slipping prevention is
1, 101 are disengaged from the lock teeth 91, 91 of the slip-prevention lock tooth member 90, so that they ascend while sliding on the tooth surface. However, when the drive of the lifting cylinder 80 is stopped, at that time, the lock claws 101, 101 engage with the corresponding lock teeth 91, 91 due to the weight of the slip-prevention lock claw mounting member 100 at that time. 1
Sliding of 0, 10 is prevented.

Next, in order to lower the raised tables 10 and 10, for example, as shown in FIGS. 3 to 4, the small cylinder 120 is inserted into the locking claws 101 and 101 of the locking claw mounting member 100 for preventing slipping. It is attached to the mounting portion and the piston rod 121 is extended. When the outer wall of the lifting cylinder 80 is pressed by the extension of the piston rod 121, for example, the slip-preventing lock claw mounting member 100
Since the free end side of the lock floats, the lock claws 101 and 101 are released. After that, if the lifting cylinder 80 is driven to contract the piston rod 81, the tables 10 and 10 are
According to this contraction, it is freely lowered.

When the tables 10 and 10 are moved up and down as described above, the cam roller 61 of the link plate 60 rolls on the outer shape (outer peripheral surface) 50a of the cam 50 as shown in FIGS. The movement of the rod 70 is controlled. That is, to explain with the enlarged view of FIG.
However, when ascending from the start position (H ₀ ) to the top position (H ₁₈₀₀ ), the table 10, 1
When the vehicle is mounted on 0, a large tension is applied to the balancing link rod 70. This tension is applied via the link plate 60 to the cam roller 6
1, the cam roller 61 moves from the start point (S point) of the outer peripheral surface 50a of the cam 50 to the final reaching point (E point).
Move in the range X up to. In other words, a force (tensile force) based on the shape of the outer peripheral surface 50a of the cam 50 acts on the balance link rod 70 through the cam roller 61 and the link plate 60, so that the outer peripheral surface 50a.
If the shape of the table is a special orbital shape (the table 10, 10 is always kept horizontal), the table 10, 1
0 is always kept horizontal when moving up and down. In this case,
In order to finely adjust the rolling contact relationship between the balance link rod 70 and the cam roller 61 and the cam 50 of the link plate 60, the threaded portion 70a of the balance link rod 70 is replaced with a female screw member 72 for rod length adjustment. You can move it back and forth.

In raising and lowering the tables 10 and 10,
For example, the balance link rod 70 is connected to the cam 50, the link plate 6
In the case of directly supporting the short arm 40 without providing 0 and the cam roller 61, as shown in FIG.
It is not possible to maintain the level of the tables 10 and 10 during the entire lifting process. For example, in the table 10 of FIG. 1, if the locus of the front end portion (end portion of the long arm 20 on the side opposite to the shaft support portion) 10a is illustrated, it will fluctuate as a curve I in FIG. Therefore, the shape of the outer peripheral surface 50a of the cam 50 may be formed so that the variation of the curve I is always zero.

[0015]

As is apparent from the above description, the vehicle lift according to the present invention has the following excellent effects. (1) First, since it is a lift that uses a link mechanism, the installation space is small, it can be stored under the floor, and the entire device can be made compact, while at the same time structurally relatively simple and excellent in usability. The table is provided with a cam formed so that the table is always kept horizontal when the table is raised and lowered.
It is always moved horizontally and stably. Therefore, a waving phenomenon of the table can be effectively prevented, safety is high, and a long-life vehicle lift can be obtained in which excessive force is not applied to each shaft support portion of the link mechanism. (2) Further, a means for preventing the table undulation phenomenon is
Because of the specially shaped cam provided in a part of the link mechanism, the table moves up and down vertically, and there is no problem that the table is slightly displaced in the front-rear direction unlike the conventional lift shown in FIG. 7, and high stability is achieved. can get. Further, since the link plate having the cam and the cam roller rolling in contact with the cam is composed of relatively small parts, the cost is lower than that of the rail, which is a component for correcting the wavy phenomenon of the conventional lift shown in FIG. It becomes possible to provide.

[Brief description of drawings]

FIG. 1 is a schematic side view showing an embodiment of a vehicle lift according to the present invention, showing a state in which a table reaches a top position.

FIG. 2 is a view from the direction B in the vehicle lift of FIG.

3 is a partially enlarged side view showing a link plate having a cam and a cam roller rollingly contacting with the cam in the vehicle lift of FIG.

4 is a schematic perspective view showing a mechanism for preventing the table from slipping in the vehicle lift of FIG.

FIG. 5 is a schematic explanatory view showing the up-and-down stroke of the table in the vehicle lift of FIG.

6 is an enlarged explanatory view showing a rolling contact stroke of a cam and a cam roller in the vehicle lift of FIG.

FIG. 7 is an explanatory diagram showing a graph of a waving phenomenon in the up-and-down stroke of a table in a vehicle lift without a cam.

FIG. 8 is a schematic side view showing an example of a conventional vehicle lift provided with a conventional corrugation preventing device.

[Explanation of symbols]

10 Table 20 Long Arm 21 Rotating Roller 30 Laying Rail 40 Short Arm 50 Cam 60 Link Plate 61 Cam Roller 70 Balance Link Rod 80 Elevating Means 81 Elevating Rod L ₁ Link Mechanism

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Naoki Sakamoto 2-3, Yoshima Industrial Park, Iwaki City, Fukushima Prefecture Orion Techno Co., Ltd.

Claims (2)

[Claims] 1. A lift for a vehicle, wherein a table on which a vehicle is mounted is moved up and down by a link mechanism driven by an elevating means. A part of the link mechanism is provided with the table which is constantly moved when the table is moved up and down. A lift for a vehicle, comprising a cam formed so as to be maintained horizontally. 2. A long arm, one end of which is rotatably supported by a table on which a vehicle is mounted, and the other end of which moves on a laying rail in a pit via a rotating roller, and in the middle of the long arm. While one end is rotatably supported,
The other end has a short arm rotatably supported on the side opposite to the free end side of the long arm of the laying rail, a cam attached to the shaft fulcrum of the short arm and the long arm, and rolls on the cam. A cam roller is rotatably supported at one end, the other end is rotatably supported in the middle of the short arm, and one end is rotatably supported in the middle of the link plate. A balance link rod whose other end is rotatably supported on the table, and an elevating means in which the free end side of an elevating rod such as an elevating cylinder is rotatably supported in the middle of the long arm,
A vehicle lift characterized in that the outer shape of the cam is formed so that the table is always kept horizontal when the table is lifted and lowered by the driving of the lifting means.