JPH0450002B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention consists of a cylindrical external leg and an internal leg that is slidably inserted relative to the cylindrical outer leg via a rolling element. , relates to an elevating table used for drafting tables, medical instrument tables, chairs, etc.

[Conventional technology]

In the conventional lifting platform, a rolling element such as a ball bearing or a steel ball rotatably attached to the inner leg side is in pressure contact with the inner wall surface of the outer leg body having a rectangular cylindrical shape. The inner leg is configured to be able to move up and down relative to the inner wall surface of the outer leg along the inner wall surface of the outer leg by rotational guidance of the rolling elements. In addition, as another conventional example,
Rod-shaped guide rails are arranged at each corner of the inner wall surface of the quadrangular cylindrical outer leg, and the rolling elements on the inner leg side are pressed against the guide rails.

[Problem that the invention seeks to solve]

In the case of the first conventional example, the side wall of the outer leg is deformed in a bulging direction due to pressure from the rolling element, and as a result, the rolling element no longer comes into close contact with the inner wall surface of the outer leg. However, there was a problem in that backlash occurred between the external leg and the internal leg. In addition, in the second conventional example, since the rolling elements come into pressure contact with each corner of the inner wall surface of the external leg via the guide rail, the external leg does not deform in the direction of swelling due to this pressure, but the guide rail The leg holding force by the rolling elements is weak against the pressure acting between the legs in the rotational direction, and this rotational pressure causes the external leg to deform in the torsional direction. The present invention aims to eliminate the above-mentioned defects.

[Means to resolve the problem]

In the present invention, an internal leg 6 is loosely fitted into a hollow portion of an external leg 2, and a rolling element 18 disposed between the legs 2 and 6 rotates to move the internal leg 6 to the external leg 2. In the lifting platform that is slidable relative to the wall surface forming the hollow part of the external leg body 2,
a pair of first flat surfaces 24 facing each other in parallel;
28, a pair of second flat surfaces 22, 26 perpendicular to the first flat surfaces 24, 28 and facing each other parallel to each other, and inclined with respect to the first and second flat surfaces; reinforcing inclined surfaces 10a located in four directions of the hollow portion, each reinforcing inclined surface 10
The rolling elements 18 are placed in contact with each other near both sides of a.

[Effect]

In the above configuration, the pressing force of the rolling elements 18 against the external leg body 2 acts near both sides of the reinforcing inclined surface 10a, and does not act in a direction that causes the inner wall surface to bulge outward. Furthermore, the external leg body 2 is provided with a rolling element 18 due to the reinforcing action of the reinforcing inclined surface 10a.
It also exhibits great strength against pressure applied through the internal legs in the rotational direction.

〔Example〕

Next, the structure of the present invention will be described in detail based on an example of an elevating drafting table shown in the accompanying drawings.

Reference numeral 2 designates an external leg body made of aluminum that is erected on the base 4, and has a square cylindrical cross-sectional shape as shown in FIG. In the hollow portion of the external leg 2, an internal leg 6 made of aluminum is loosely fitted. The internal leg 6 consists of four mutually perpendicular side walls, and the upper part of the leg 6 has:
As shown in FIG. 5, a drawing board support frame 8 is attached. Reference numeral 10 indicates four reinforcing plates made of thin iron plates, and both side parts forming roller guide surfaces are fixed to mutually perpendicular inner walls near each corner of the external leg body 2 by adhesive or welding. ing. The reinforcing plate 10 forms reinforcing inclined surfaces 10 a located in four directions of the hollow portion of the external leg body 2 . At each corner of the inner wall surface of the external leg body 2, a hollow part 1 having a triangular cross section is formed by the middle part of the reinforcing plate 10.
2 is formed, and a hollow portion 14 having an octagonal cross-sectional shape is formed by the inner wall surface of the external leg body 2 and the intermediate portion of the reinforcing plate 10. Reference numeral 16 denotes a retainer having an L-shaped cross section, and rolling elements 18 made of rollers are rotatably supported on this retainer. As shown in FIG. 1, the retainer 16 is disposed to face each corner of the internal leg 6, and the surfaces of the rolling elements 18 supported by the retainer 16 have eight surfaces forming the hollow portion 14 having an octagonal cross section. They are located near each corner of the inner wall surface of the shape and are in pressure contact with the inner wall surface, that is, the surfaces of each side of the reinforcing plate 10. That is, the rolling elements 18 are disposed in contact with each other near both sides of each reinforcing inclined surface 10a. The other side of the surface of the rolling element 18 is in pressure contact with a mutually perpendicular outer wall surface near each corner of the internal leg body 6. In FIG. 1, reference numeral 20 denotes a gas spring that biases the internal leg 6 upward, and is used to balance the load applied downward to the internal leg 6.

Next, the operation of this embodiment will be explained.

Release the brake (explanation omitted) on the internal leg 6,
When the internal leg body 6 is pressurized upward, the internal leg body 6
is guided by the rolling elements 18 and moves vertically along the inner wall surface of the external leg 2. The pressure of the rolling element 18 against the inner wall surface of the external leg body 2 is
4, the side wall of the external leg 2 It does not bulge outward. Moreover, since the rolling elements 18 are in line contact with the vicinity of both sides of each reinforcing inclined surface 10a, the external leg 2 is able to resist the load applied to the internal leg 6 in the rotational direction in a plane horizontal to the floor surface. Demonstrates strong supporting capacity. In addition, in the above embodiment, the hollow part 1 of the external leg body 2
4 has an octagonal cross section with the reinforcing plate 10, but the reinforcing plate 2'' may be integrally formed on the external leg 2' as shown in FIG. 7.Also, as shown in FIG. As shown in FIG. 1, the external leg body 2' itself may be formed to have an octagonal cross section.Therefore, as shown in FIG. The structure is not particularly limited.In addition, when carrying out the present invention, the present invention is not particularly limited to an elevating drafting table, and as shown in FIG. The present invention can also be used for a medical instrument elevating platform 32 equipped with a mounting plate 30 for mounting or installing a medical instrument (not shown) on the body 6. The base 4 may be erected, and the external legs 2 may be configured to be able to rise and fall on the base 4. Also, the rolling elements 18 are not limited to rollers using ball bearings; Steel balls etc. can be used.

〔Effect of the invention〕

Since the present invention is configured as described above, it is possible to prevent the external leg from deforming due to the pressure from the rolling elements that come into contact with it, so that the internal leg can be fixed relative to the external leg. It can be moved smoothly. Further, there is an effect that the external leg and the internal leg can be firmly connected via the rolling elements against torsional force in the rotational direction.

[Brief explanation of the drawing]

The figures show preferred embodiments of the present invention, in which Fig. 1 is a cross-sectional view, Fig. 2 is a longitudinal sectional view, Fig. 3 is a plan view of the retainer, Fig. 4 is a front view thereof, and Fig. 5 is a front view of the retainer. External view,
FIG. 6 is an external view, FIG. 7 is a sectional view showing another embodiment, and FIG. 8 is a sectional view showing another embodiment. 2... External leg, 6... Internal leg, 8... Drawing support frame, 10... Reinforcement plate, 12, 14... Hollow part, 16... Retainer, 18... Rolling element.

Claims (1)

[Claims] 1 Loosely fit the internal leg 6 into the hollow part of the external leg 2,
In the lifting platform in which the internal leg 6 is slidable relative to the external leg 2 by rotation of a rolling element 18 disposed between the legs 2 and 6, a hollow space in the external leg 2 is provided. A pair of first flat surfaces 24 and 28 facing each other parallel to each other on a wall surface forming the section;
A pair of second flat surfaces 22, 2 that are perpendicular to the first flat surfaces 24, 28 and parallel to each other.
6, and reinforcing inclined surfaces 1 that are inclined with respect to the first and second flat surfaces and located in four directions of the hollow portion.
0a, and the rolling elements 18 are disposed in contact with each other near both sides of each reinforcing inclined surface 10a.