JPH0351297A - Table lift - Google Patents

Abstract

PURPOSE:To repeatedly stop a table in a desired position with accuracy and with much ease and also maintain the table in a predetermined position by providing a cam plate which raises and lowers a table relative to a base while in engagement with a roller device, as the base and the table are brought close to and separated from each other. CONSTITUTION:A hydraulic cylinder is actuated so that its plunger is pushed out. Then a cam plate 15 is moved between a first roller 23 and a second roller 24, and the second roller 24 disposed on the side of a table 2 leads to an inclined cam face 21 while rotating on the first parallel cam face 18 of the cam plate 15, and the roller 24 is pushed up along the inclination of the cam face 21, and the link 5 of a scissors-shaped link mechanism 3 is put in a turning movement about a pin 8 so that the table 2 is pushed up in the direction roughly perpendicular to a base 1. Then the second roller 24 is put on a second parallel cam face 20 provided at the center of the cam portion 17 and the table 2 rising is temporarily stopped at this position.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a table lift.

[Prior art] Generally, a conventional table lift has a base, a table,
A scissor-like link IRtN is provided between the base and the table and supports the table so as to be movable in a direction perpendicular to the base while maintaining a parallel relationship with the base; It is provided with a drive device such as a hydraulic cylinder that moves the table up and down with respect to the base.
A scissor-like link mechanism raises and lowers the table by operating a hydraulic cylinder.

[Problem to be solved by the present invention] In such a table lift, the function is satisfactory when raising and lowering the table normally or stopping at a predetermined position, but when the table is raised slightly from the lowest position. If it is necessary to stop at the T position, it is difficult to accurately adjust the height and maintain that height. Hi-sushi is also not satisfactory. This is because when the table is in a low position, a small movement of the hydraulic cylinder will cause the table 3 to move up and down relatively significantly, so in order to stop the table exactly at the desired position, the hydraulic cylinder must be moved very little at a time. This is because, in order to maintain the table in a predetermined position, oil leakage from the hydraulic cylinder is not allowed.

Furthermore, there is also the disadvantage that the table position changes due to changes in the load on the table.

In order to solve this problem, Japanese Utility Model Application No. 63-173192 discloses a system in which rollers are provided on both the base and the table, a cam plate is inserted between these rollers, and the table is directly pushed up by the operation of the cam plate. Proposed. In this table lift, the above-mentioned problems have been satisfactorily solved.

However, since the table is directly pushed up by the cam plate, there is a limit to its lift height, which limits the uses of the table lift.

[Means for Solving the Problems] Therefore, an object of the present invention is to obtain an accurate height when the table is stopped at a predetermined position within a practically sufficient lift range, and to The idea is to have a table lift that is easy to maintain. For this purpose, the table lift driving device of the present invention is movable by being provided between the roller device provided on the scissor-like link M & the horizontal link, the base and the table, and is integrated into the roller device. a cam plate that moves the base and table apart from each other and raises and lowers the table relative to the base; and a fluid pressure cylinder that moves the cam plate to raise and lower the table.
The shape of the cam plate is such that the table does not move at both ends of the movement stroke of the cam plate, and the table moves up and down in accordance with the movement of the cam plate at the middle part of the movement stroke of the cam plate.

[Example] Next, the present invention will be explained along with embodiments shown in the accompanying drawings.

FIG. 1 is a side view of the table lift of the present invention, and FIG. 2 is a front view of the table lift of the present invention.

In FIG. 1 and FIG. 2, the table lift of the present invention has a base 1 having a substantially rectangular planar shape, and a base 1 arranged so as to overlap the base 1, which has a plane substantially on the same plane as the base 1. A shaped table 2 is provided between the base 1 and the table 2, and the table 2 is placed between the base 1 and the base 1 while maintaining a parallel relationship with the base 1.
The device includes a scissor-like link mechanism 3 that is movably supported in a direction perpendicular to , and a drive device 4 that is provided between the base 1 and the table 2 and moves the table 2 up and down with respect to the base 1.

The scissor-shaped link mechanism 3 itself may be of a known type, and in the illustrated example, it is a scissor-shaped link mechanism constructed by providing a pair of two links 5 and 6 combined in an X-shape, two on each side of the table lift. A total of four sets of link IR structures are provided. Links 5 and 6 of each scissor-like link mechanism 3 are pivotally connected to each other by a pin 7, the fixed end of the link 5 is pivotally connected to the base 1 by a pin 8, and the movable end is engaged with the table 2 via a roller 9. The fixed end of the other link 6 is pivotally connected to the table 2 by a pin 10, and the movable end engages with the base 1 via a roller 11. As is well known, the scissor-shaped link mechanism 3 configured in this manner maintains the parallel relationship between the table 2 and the base 1 while moving the table 2 perpendicular to the main surface of the base 1, that is, the horizontal plane. It supports the object so that it can move in any direction.

The drive device 4 of the present invention includes a roller device 12 provided on the link 5 of the scissor-like link mechanism 3, a base 1, and a table 2.
a cam plate 15 that is movable and is provided between the cam plate 15 that engages with the roller device 12 to move the base 1 and the table 2 away from each other to move the table 2 up and down with respect to the base 1; It is equipped with a hydraulic cylinder 16 such as hydraulic pressure that moves the cam plays 1 and 15 so as to raise and lower them.

The shape of the cam plate 15 is such that the table 2 is not moved at both ends of the movement stroke of the cam plate 15, and the table 2 is moved up and down in accordance with the movement of the cam plate 15 at the middle part of the movement stroke of the cam plate 15. It is. The cam plates 12 are arranged inside each scissor-like link mechanism 3 and form a pair. One end of each of the pair of cam plates 12 is connected to the rod 1 in order to maintain a predetermined spacing.
5a, and the other end is connected by a rod 15b.

In the illustrated example, the cam plate 15 has two cam portions 1.
7 is provided. Each cam portion 17 as a whole is a triangular protrusion pointing upward to the right in the figure, and has a first parallel cam surface 18 that is formed at the lower end and is approximately parallel to the main surface of the table 2.
, one second parallel cam surface formed at the end on the high side and substantially parallel to the main surface of the table 2, and one second parallel cam surface formed at the intermediate part between these parallel cam surfaces 18 and one parallel cam surface and parallel to the main surface of the table 2. It has a third parallel cam surface 20 that is substantially parallel to the third parallel cam surface 20, and an inclined cam surface 21.22 formed between these three parallel cam surfaces 18.19 and 20 and inclined.

The roller mounting 12 has a 10th roller 23 disposed on the base 1 side and a 20th roller 24 attached to the link 5 of the scissor-like link mechanism 3, and the 10th roller 23 is a cam. The 20th roller 24 is provided so as to engage with the upper edge of the plate 15, that is, the cam surface side, and the 20th roller 24 is provided so as to engage with the lower edge of the cam plate 15.
It is configured to be movable between rollers 23 and 24.

The hydraulic cylinder 16 has its tail end pivoted to the base 1, and the free end of its plunger 25 is connected to two cam plates 15.
It is pivotally connected to a rod 15a that connects the two.

The table lift of the present invention configured in this way is
To move from the lowered position shown in phantom lines in the figure and shown in FIG. 2 to the raised position shown in solid lines in FIG. 1, the hydraulic cylinder 16 is actuated to push out its plunger 25. Then, the cam plate 15 is moved to the right in FIG. 1 and moves between the 10th roller 23 and the 20th roller 24.
- the roller 271 is the first parallel cam surface 1 of the cam plate 15;
8 reaches the inclined cam surface 21, the roller 24 is pushed up along the inclination, the link 5 of the scissor-like link mechanism 3 rotates around the pin 8, and the table 2 moves to the base 1.
It is pushed up in a direction approximately perpendicular to the surface. Eventually, the second
The 0-ra 24 is the second parallel cam surface 2 in the middle of the cam portion 17.
0, and despite the movement of the cam plate 15, the table 2 temporarily stops rising at that position. Furthermore, when the cam plate 15 is moved to the left, the 20th roller 24 passes the second parallel force 11 surface 20 of the cam plate 15 and is pushed up by the next inclined cam surface 22, and eventually reaches the third parallel cam surface 1. 1, at which point the table 2 reaches its highest position, which is shown in solid lines in FIG.

The 20th roller 24 of the roller device 12 is the cam plate 1
When the table 2 is placed on the parallel cam surfaces 18, 19 or 20 of the table 2, the load on the table 2 is received by the horizontal surface of each parallel cam surface, so the table 2 can be stably maintained at its respective position.

In the illustrated embodiment, the shape of the cam plate 15 is as follows:
Both ends of the cam plate 15 are substantially parallel to the main surface of the table 2, and the middle part is inclined to connect the two ends. It is composed of only a surface that maintains the temperature and an inclined surface that raises and lowers the table 2, and the shape can be simplified.

In this case, in order to stably hold the table 2 in the lowest position, the upper end of the side wall of the base 1 and the lower end of the side wall of the table 2 may be in contact with each other. It is also possible to provide a stopper on either the base 1 or the table 2 so as to support the table 2 at a fixed position. Further, in the illustrated embodiment, there are two cam plates, but the number of cams can be increased or decreased depending on the required length of the table.

[Effects of the Invention] As described above, according to the table lift of the present invention, when the table 2 needs to be stopped at a position that is conveniently raised (for example, 7 cm) from the lowered position, it is possible to lift the table 2 using only a few hydraulic cylinders. Since the movement of the table does not raise or lower the table significantly, and the table is raised and lowered by the force of the cam plate, it is extremely easy to repeatedly stop the table at a desired position. It is also easy to keep in place. Even if oil leaks from the hydraulic cylinder, the table will not fall, and there will be no inconvenience that the table position will change due to changes in the load on the table.

Furthermore, there is no inconvenience that the table position changes due to a change in the load on the table. Also.

Since the structure is such that the link is pushed up by the cam plate and the table is not directly pushed up, the limit of its lifting height is relatively large, expanding the range of uses for the table lift. in this way,
Even when the table is stopped at a predetermined value T within a range of practically sufficient lifting height, an accurate height can be obtained, and there is an effect of obtaining a table lift that can easily maintain the height.

[Brief explanation of drawings]

FIG. 1 is a side view of the table lift of the present invention, and FIG. 2 is a schematic front view showing the lowest position of the table lift l~ in FIG. 1. 1... Base, 2... Table 3... Scissor-shaped link mechanism, 5... Link 16... Hydraulic cylinder 15... Cam plate, 120-Lar device and-1", I"

Claims (1)

[Scope of Claims] A base, a table, and a link provided between the base and the table, wherein the table is connected to the base while maintaining a parallel relationship with the base. A table lift equipped with a scissor-like link mechanism movably supported in a direction perpendicular to the table, and a drive device provided between the base and the table to raise and lower the table with respect to the base. The driving device is movable and is provided between a roller device provided on the link of the scissor-shaped link mechanism, the base and the table, and the drive device is movable and engages with the roller device to drive the base. a cam plate that moves the table and the table apart from each other to move the table up and down with respect to the base; and a fluid pressure cylinder that moves the cam plate so as to move the table up and down; the shape of the cam plate. is characterized in that the table is not moved at both ends of the movement stroke of the cam plate, and the table is moved up and down in accordance with the movement of the cam plate at the middle part of the movement stroke of the cam plate. table lift.