JP2525523Y2 - Table lift arm structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a table lift arm structure for moving a table up and down in parallel with a frame.

[0002]

2. Description of the Related Art The present applicant has previously disclosed Japanese Patent Publication No. 59-4192.
No. 0 provides a table lift capable of extremely lowering the minimum position of the table as compared with a conventional product. As shown in FIG. 4, the table lift 30 has a structure in which X-shaped link arms 33 and 34 are arranged between a frame 31 and a table 32 in two upper and lower stages for the purpose of obtaining a large lift amount. By operating a cylinder 35 mounted between the inner arm 33a of the link arm 33 and the inner arm 34a of the upper link arm 34, the table 32 is moved up and down in parallel.

At the lower ends of both arms 34a, 34b of the upper link arm 34, connecting pieces 34a ', 34
b 'is extended and fixed in an L-shape. The arms 34a, 34b of the connecting pieces 34a', 34b '
The lower link arm 3 is mounted on the same side as the
The three arms 33a and 33b are rotatably supported via shafts 38 and 39. For this reason, the outer arms 34b, 33b and the inner arms 34a, 33a in the upper and lower link arms 34, 33 are connected.
As a result, when the table 32 reaches the lowest position, the outer arms 34b, 33b of the upper link arm 34 and the lower link arm 33 as shown in FIG. In addition, the inner arms 34a and 33a are housed in a state where they are vertically arranged in parallel on the same surface, whereby the lowest position of the table 32 can be made lower than that of the conventional product.

[0004]

According to such a conventional structure, in order to lower the lowest position of the table 32 as much as possible, the width h2 of the upper arms 34a and 34b and the lower arms 33a are set. , 33b is advantageously as small as possible. However, the arm 33
a, 33b or the widths h1, h of the arms 34a, 34b
When 2 is reduced, the section modulus Z or the second moment of area I is reduced, and the rigidity is reduced, and the strength of the table lift is reduced.

Here, both upper arms 34a, 34b
There are certain restrictions on reducing the width h2. That is, as schematically shown in FIG.
a ', 34b' and the shafts 38, 3
The axis 40 and the axis L are connected to the lines L1 and L2 connecting the axis 9 and the axis 37, respectively.
In order to position the roller 41, the arms 34a and 34b
Must be greater than a certain width h2. On the other hand, the lower arms 33a and 33b do not have such a situation, and the width h1 can be made smaller than the width h2 of the upper arms 34a and 34b in order to lower the table height. This is because, as shown in FIG. 4, in the inner arm 34a of the upper link arm 34, the line L1 connecting the shafts 38, 37 and 40 deviates greatly from the center line in the width direction of the arm 34a and the outer arm 34b does not. The line L2 connecting the shafts 39, 37 and 41 is
In the lower link arm 33, the line L3 connecting the shafts 39, 36 and 43 and the line L4 connecting the shafts 38, 36 and 42 are different from the outer arm 33b, respectively. It is clear from the fact that the inner arm 33a is substantially along the center line in the width direction of the inner arm 33a. From the above situation, both lower arms 33
The width h1 of a and 33b is smaller than that of the upper side,
Therefore, its rigidity is lower than that of the upper arms 34a, 34b.

As described above, the table lift 30 proposed by the applicant of the present application has a certain effect in lowering the lowest position of the table 32 as compared with the conventional product. 3 in the link arm 33 of
The width h1 of 3a, 33b is smaller than the width h2 of the arms 34a, 34b of the upper link arm 34, so that the section modulus Z or the second moment of area I becomes smaller. Although the minimum height can be reduced, there is a problem that the strength of the table lift 30 is reduced depending on the rigidity of the lower link arm 33.

[0007] The present invention has been made in view of this problem,
An object of the present invention is to increase the rigidity of both arms in a lower link arm while maintaining the advantage that the lowest position of the table can be lowered.

[0008]

For this reason, according to the present invention, the lower two arms are formed by integrally forming a reinforcing edge having a large width and a main body having a small width in a superposed shape having a substantially L-shaped cross section. The main body is rotatable with respect to the upper arm on the same plane as the upper arm, and when the table reaches the lowest position, the main body is flush with the upper arm. It is characterized in that it is housed in a state of being folded up and down in parallel above and that the reinforcing edge is connected in such a manner as to protrude to the side of the upper arm in the housed state.

[0009]

According to the above construction, the reinforcing edge is connected to the upper arm in such a manner as to protrude to the side of the upper arm. The outer arm and the inner arm are housed in a state where they are folded up and down in parallel on the same plane, and the conventional effect of lowering the minimum height of the table is exhibited without any hindrance.

On the other hand, since the reinforcing arms having a large width are integrally formed on both lower arms, the section modulus and the second moment of area are smaller than those of the conventional arm corresponding only to the main body. The stiffness and thus the strength of the table lift are increased.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIGS. FIG. 1 shows the entire table lift 1 of the present embodiment. The components of the table lift 1 other than the two arms 6 and 7 of the lower link arm 4 are the same as the conventional one, but the configuration of the table lift 1 will be briefly described below.

The table lift 1 has two upper and lower link arms 4 and 5 between the frame 2 and the table 3. The two upper and lower link arms 4 and 5 are arranged in parallel in a direction orthogonal to the plane of FIG.

The lower link arm 4 is an outer arm 7
And the inner arm 6 are rotatably connected to each other by a shaft 10. The lower end of the inner arm 6 is supported by the shaft 16 at the lower right end of the frame 2 so as to be vertically rotatable. A roller 17 is attached, and the roller 17 is movably supported along the guide rail 2 a of the frame 2. On the other hand, the upper link arm 5 is formed by connecting the outer arm 9 and the inner arm 8 to each other so as to be rotatable with each other by a shaft 11. The upper end of the inner arm 8 is vertically rotated by the shaft 14 to the right end of the table 3 in the drawing. Roller 15 at the upper end of the outer arm 9.
The roller 15 is movably supported along the guide rail 3a of the table 3.

The upper link arm 5 and the lower link arm 4 are connected by shafts 12 and 13. That is, connecting pieces 8a, 9a are respectively attached to the lower ends of the upper inner arm 8 and the outer arm 9 substantially orthogonally in an L-shape, and the connecting pieces 8a on the inner arm 8 side are provided.
The upper end of the lower inner arm 6 is rotatably connected to each other via a shaft 12, while the upper end of the lower outer arm 7 is connected to the connecting piece 9 a on the outer arm 9 side via a shaft 13. It is movably connected. Moreover, the lower arms 6 and 7 are connected to the arms 8 and 9 of the connecting pieces 8a and 9a.
Are supported on the same side as the surface on which the is mounted. Therefore, the upper and lower outer arms 9, 7 and the inner arms 8, 6 respectively rotate on the same plane.

A hydraulic cylinder 18 is interposed between the lower inner arm 6 and the upper inner arm 8. The rear end of the cylinder 18 is rotatably supported by the shaft 19 with respect to the lower inner arm 6, while the rod end of the cylinder 18 is rotatably supported by the shaft 20 with respect to the upper inner arm 8. I have. When the cylinder 18 is operated, the upper and lower link arms 4 and 5 are operated in the closing direction or the opening direction in conjunction with each other, whereby the table 3 is moved up and down in parallel.

Now, both arms 6 and 7 of the lower link arm 4 are connected to the main body portions 6b and 7b and the reinforcing edge 6 respectively.
a and 7a. The main body portions 6b and 7b are connected to a lower arm 33 of the conventional table lift 30.
The main body portions 6b and 7b have a width h1 as shown in FIG. 3 (b).

From this, when the table 3 reaches the lowest position, the upper and lower link arms 4 and 5 are almost vertically stacked as before, and the upper outer arm 9 and the main body 7b of the lower outer arm 7 are connected to each other. In addition, the upper inner arm 8 and the main body 6b of the lower inner arm 6 are flush with each other vertically and substantially in parallel. In addition, this is shown in FIG.
5 is the same. For this reason, in the table lift 1 of the present embodiment, the effect that the lowest position of the table 3 can be lowered as in the conventional table lift 30 is exhibited as it is.

Each of the main body portions 6b and 7b has a reinforcing edge 6
a and 7a are integrally formed so as to overlap each other as shown in FIGS. Reinforcement edges 6a, 7
a has a width h1 'larger than the width h1 of the main body portions 6b and 7b.
When the table 3 is at the lowest position, the reinforcing edge 6a on the inner arm 6 side protrudes inward of the inner arm 8 on the upper stage, and the reinforcing edge 7a on the outer arm 7 side is connected to the outer arm 9 on the upper stage. The lower arms 6, 7 are connected to the upper arms 8, 9 in such a direction as to protrude outward. The thickness of both arms 6 and 7 is equal to the thickness of reinforcing edges 6a and 7a.
a, 34b. The reinforcing edges 6a, 7a are formed over substantially the entire length in the longitudinal direction of the outer arm 7 and the inner arm 6, as shown in FIG.

By forming the reinforcing edges 6a, 7a integrally with the arms 6, 7 of the lower link arm 4, the width of the arms 6, 7 is at most h1 'and the reinforcing edges 6a, 7a Of the lower arm 33a of the conventional table lift 30 by the overhang (h1 '-h1).
33b is larger than the width h1. The plate thickness of both arms 6 and 7 is reduced by the plate thickness of reinforcing edges 6a and 7a to lower arms 33a and 33 in conventional table lift 30.
It is thicker than the plate thickness of b. By making the width and the plate thickness large in this manner, the section modulus Z or the second moment of area I of both lower arms 6 and 7 are increased, and the rigidity thereof is increased.

This embodiment is constructed as described above.
According to this configuration, of the link arms 4 and 5 connected in the upper and lower stages, the rigidity of the lower link arm 4 is increased as compared with the related art, so that the strength of the table lift 1 as a whole can be increased. Moreover, both reinforcing edges 6a,
7a is formed so as to protrude to the side of both arms 8, 9 of the upper link arm 5, so that when the table 3 reaches the lowest position, the main body 6b, which corresponds to the conventional arms 33a, 33b, It is not hindered that the upper-stage link arms 8 and 9 are stored in a state in which the upper-side link arms 8 and 9 are folded in parallel on the same plane, so that the lowest position of the table 3 in the conventional table lift 30 can be set lower. The effect is not lost at all.

[0021]

According to the present invention, the rigidity of the lower link arm can be reduced without sacrificing the merit that the lowest position of the table can be set at a lower position in a table lift having two upper and lower link arms. And the strength of the table lift can be increased.

[Brief description of the drawings]

FIG. 1 is an overall side view of a table lift according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG. 1, showing a positional relationship between upper and lower link arms when the table is at a lowest position.

3A and 3B show a lower outer arm, in which FIG. 3A is a plan view and FIG. 3B is a front view.

FIG. 4 is an overall side view of a conventional table lift.

FIG. 5 is a schematic view of a side surface of a table lift showing a positional relationship of each axis when a table is at a lowest position in a conventional table lift.

6 is a sectional view taken along the line BB of FIG. 5, showing the positional relationship between the upper and lower link arms when the table is at the lowest position in the conventional table lift.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Table lift 3 ... Table 4 ... Lower link arm 5 ... Upper link arm 6 ... Lower inner arm, 6a ... Reinforcement edge 7 ... Lower outer arm, 7a ... Reinforcement edge 8 ... Upper inner arm, 8a ... Connection Piece 9 ... Upper outer arm, 9a ... Connecting piece 18 ... Hydraulic cylinder 30 ... Conventional table lift 33 ... Lower link arm 33a ... Inner arm, 33b ... Outer arm 34 ... Upper link arm 34a ... Inner arm, 34b ... Outer arm L1 L4: Line connecting the connecting portions of the arms h1: Width of the lower arm in the conventional table lift h2: Width of the upper arm h1 ': Width of the lower arm in the table lift of this example

Claims (1)

(57) [Scope of request for utility model registration] 1. A link arm comprising an outer arm and an inner arm connected in an X-shape between a table and a frame is provided in two vertical stages so that the table moves up and down in parallel with the frame. It is a structure of the lower two arms in the table lift, wherein the lower two arms each integrally form a large width reinforcing edge and a small width main body in a superposed shape having a substantially L-shaped cross section. The main body is rotatable with respect to the upper arm on the same plane as the upper arm, and when the table reaches the lowest position, the main body is flush with the upper arm. It is housed in a state where it is folded up and down in parallel, and the reinforcing edge is connected to the upper arm in the housed state so as to protrude to the side of the upper arm. Arm structure of the table lift to.