JPH0246924Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial application field The present invention is suitable for use in height-adjustable telescoping legs, for example, support legs for pommel horses, vaulting horses, etc., or for sports equipment such as volleyball posts, parallel bars, horizontal bars, etc. In addition, the present invention relates to rattling prevention structures for extendable legs used in furniture such as desks and tables.

BACKGROUND TECHNOLOGY In general, a telescoping pedestal in which both an inner and outer shaft body are slidably fitted in the axial direction is composed of, for example, an outer cylinder body and an inner cylinder body fitted in the axial direction. To prevent mutual sliding interference between the cylindrical body and the outer cylindrical body,
While forming a predetermined clearance between the inner and outer cylindrical bodies, a predetermined spacer is usually interposed between the inner and outer shaft bodies in order to prevent rattling between the two cylindrical bodies due to the clearance. This spacer is
For example, a protrusion may be formed radially inward in a spherical shape near the end of the outer cylinder, and the tip of this protrusion may come into contact with the inner cylinder in a dotted manner, or A rattling prevention structure was adopted in which a synthetic resin plate was appropriately interposed between the inner cylinder and the outer cylinder near the end of the cylinder, and this plate was fixed from the outside of the outer cylinder with screws or bolts.

Problems to be solved by the invention However, according to the conventional rattling prevention structure described above, forming a spherical protrusion on the inner circumferential surface of the outer cylinder requires embossing, which is costly. Moreover, since the protrusion and the inner cylindrical body come into sliding metal-to-metal contact, the inner cylindrical body is scratched, resulting in poor appearance and poor sliding operation. On the other hand, in the case where a synthetic resin plate is fixed to the inner surface of the outer cylinder, the installation work is troublesome and time-consuming, and when the synthetic resin is worn out, the bolts directly hit the inner cylinder, causing scars.

In view of the above-mentioned circumstances, the present invention has been made with the object of improving the backlash-preventing structure of a telescoping pedestal in which both the inner and outer shaft members are fitted together so as to be expandable and retractable in the axial direction.

Means for Solving the Problems In order to solve the above problems, the present invention has a hole drilled in the vicinity of one end of the tubular outer shaft body, and a protrusion that fits into the hole is provided protruding approximately at the center. A frame-shaped spacer made of a circular, square, curved circle, or curved square synthetic resin plate is attached from the inside of the outer shaft body and interposed between the inner and outer shaft bodies.

Effects According to the above structure of the present invention, since the spacer has the protrusion, the protrusion can be inserted into the hole from the inside of the outer cylinder and fixed, and when the inner cylinder is fitted, the spacer can be fixed. It will not fall off due to being caught between the inner and outer cylinders.

Embodiments The present invention will be explained below based on illustrated embodiments. The illustration shows the present invention applied to the supporting legs of a pommel horse, which is a physical education equipment.
2 is a main body, and 2 is a telescopic leg, which is attached to the lower part of the main body and supports the main body 1 on a floor surface 3. Reference numeral 4 denotes a fastener that tightly connects the main body and the floor surface 3. The telescopic legs 2 are composed of an outer tube-shaped outer cylinder 5 fixed to the lower part of the main body 1 and a rectangular inner cylinder 6 inserted and fitted into the outer cylinder 5 in the axial direction. , the inner cylindrical body 6 can be expanded and contracted in the axial direction. Reference numeral 7 denotes a height adjuster that fixes the length by which the inner cylindrical body 6 extends and contracts from the outer cylindrical body 5. 8
is a top-shaped spacer, which is disposed in the clearance 9 between the inner cylinder body 6 and the outer cylinder body 5, and prevents play between the two. As shown in FIGS. 3 to 5, this spacer 8 has a hole 10 in the vicinity of the end of the outer cylinder 5.
It is made of a disk-shaped synthetic resin material with a hole 10 formed therein and a protrusion 11 that fits into the hole 10 protruding from the center.
The protrusion 11 is slightly retracted from the hole 10 without being exposed to the outside, thereby making it difficult for the entire spacer 8 to fall off from the outer cylindrical body 5 due to external pressing force.
Although this spacer 8 is shown as a disk shape in the illustration,
As shown in FIG. 6, it may have a square plate shape having tapered portions 12, 12 with chamfered corners on the side in contact with the inner cylinder body 6. Furthermore, the spacer 8 has a disk shape or a square plate shape with a curved surface in contact with the inner cylinder body 6 as shown in FIGS. It may also be possible to use the case where both the inner cylinder body 6 and the inner cylinder body 6 are cylindrical bodies. Note that the number of spacers 8 to be arranged is arbitrary, but in the case of a rectangular cylindrical shape with both the inner and outer shafts, it is preferable to arrange them on each side, and in the case of a cylindrical shape, they are preferably arranged facing each other at least in the diametrical direction. It is better to have two.

Effects of the Invention According to the invention described above, a hole is bored near one end of the outer shaft body formed in a tubular shape, and a spacer shaped like a frame is provided with a protrusion that fits into the hole protruding approximately at the center. Since it is attached from the inside of the outer shaft body and interposed between the inner and outer shaft bodies, play between the inner and outer shaft bodies is eliminated, and machining costs are reduced because it is only necessary to drill holes in the outer cylinder body. In addition, the installation process is simple, easy, and quick because all you have to do is insert the outer shaft from the end to the inside, fit the protrusion into the hole, and then insert the inner shaft into the outer shaft. This results in a reduction in work costs, and thus a reduction in the cost of the product as a whole.

[Brief explanation of the drawing]

Figures 1 and 2 are front and side views of the present invention applied to a pommel horse for physical education equipment, and Figure 3 is Figure 1A.
-A enlarged sectional view, Figure 4 is a BB sectional view in Figure 3,
5 and 6 are perspective views of the spacer, and FIGS. 7 to 9 are perspective views showing other examples of the spacer.
FIG. 0 is a partially sectional plan view showing another example of the spacer in use. 2... Telescopic legs, 5... Outer cylinder body (outer shaft body),
6... Inner cylindrical body (inner shaft body), 7... Height adjuster, 8
... Spacer, 9 ... Clearance, 10 ... Hole, 11 ... Protrusion.

Claims (1)

[Scope of utility model registration request] In a telescopic pedestal in which both the inner and outer shaft bodies are slidably fitted in the axial direction, a hole is bored near one end of the outer shaft body formed in a tubular shape, and a protrusion that fits into the hole is formed. A top-shaped spacer made of a circular, square, curved circular, or curved square synthetic resin plate protruding from the center is attached from the inside of the outer shaft body and interposed between the inner and outer shaft bodies. A rattling-preventing structure with telescopic pillars.