JPS637181Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a telescopic tube used for pipes in vacuum cleaners and the like.

[Prior art and problems]

Conventional examples of expandable tubes used in pipes for vacuum cleaners and the like include techniques disclosed in Japanese Utility Model Application Publication No. 49-58164 and Japanese Utility Model Application Publication No. 51-83834.

According to these conventional techniques, as shown in FIGS. 6 to 9, a male thread 2 is formed at the tip of the outer tube 1.

3 is a tightening spiral tube having a female thread 4 on one inner surface and a tapered portion 5 on the inner surface of the other end.

Reference numeral 6 denotes a tightening ring, which has a tapered split opening 7 in its axial direction so that both sides overlap with each other when tightened, and a taper on its outer peripheral surface that abuts against the tapered portion 5 of the tightening spiral tube 3. A shaped portion 8 is formed.

9 is an inner tube inserted into the outer tube 1.

To fix the inner tube 9 and outer tube 1, insert the inner tube 9 into the outer tube 1 and rotate the tightening screw tube 3. Arrow A
The tapered portion 5 formed on the inner circumferential surface of the tightening spiral tube 3 tightens the tapered portion 8 of the tightening ring 6, and the tightening ring 6 closes the tapered split opening 7 and closes the inner tube 9. Tighten the outer peripheral surface of the inner tube 9 and outer tube 1.
will be tightened.

Therefore, a person who wants to adjust the length of the telescopic tube and tighten it should grasp the outer tube 1 with one hand, hold the inner tube 9 with the other hand, adjust the dimensions, and then tighten the tube from the inner tube 9. It is necessary to tighten the telescopic tube by switching to the screw tube 3 and rotating the tightening screw tube 3 several times, which is a hassle.

For these reasons, it would be desirable to have a telescoping tube that can be easily tightened.

[Means for solving problems]

The present invention has an elastically deformable inner pipe that is formed into a cylindrical shape with a substantially elliptical cross-sectional shape and has a vertical groove in the longitudinal direction on the major diameter side of the outer peripheral surface of the substantially elliptical cylindrical shape, and an inner pipe that is elastically deformable in the longitudinal direction. A wedge piece that is slidably inserted and has a wedge shape with an upper half protruding above the outer circumferential surface of the inner pipe, and a concave wedge piece housing that has an inclined surface that accommodates the upper half of the wedge piece on the inner circumferential surface of the end. A telescopic tube is constituted by an outer pipe provided with a chamber and a protector that covers the wedge piece storage chamber of the outer pipe.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

As shown in FIGS. 1 to 5, reference numeral 10 denotes an outer pipe having a wedge piece storage chamber 11 having an inclined surface on the inner circumferential surface of the side end and a raised collar 12 along the outer circumferential surface. be.

As shown in FIG. 3, 13 is an inner pipe made of an elastically deformable material, which has a substantially elliptical cross-sectional shape and has longitudinal grooves 14 formed in the outer periphery on the longer diameter side thereof.

The wedge piece 15 is composed of a sliding part 16 slidably inserted into the vertical groove 14 and a wedge-shaped wedge part 17 that protrudes from the outer circumferential surface of the inner pipe, and the wedge part 17 is arranged in the wedge piece storage chamber 11. inserted within.

Reference numeral 18 denotes a protector that covers the outer surface of the wedge piece storage chamber 11, and one end is provided with a sealing ring 19 that has a U-shape and contacts the outer surface of the inner pipe 13 elastically. A tongue piece 20 that is inserted into the groove 14 and closes the longitudinal groove is provided in a protruding manner.

An annular groove 2 is provided on the inner peripheral surface of the other end of the protector 18.
1 is formed, and the collar 12 is fitted.

Therefore, since the wedge piece 15 of the protector 18 is housed in the wedge piece storage chamber 11 by the collar 21 that fits into the annular groove 21, it will not be separated from the outer pipe 10.

In FIG. 2, the outer pipe 10 is replaced by the inner pipe 13.
When rotated counterclockwise on the outer circumference, wedge piece storage chamber 1
The inclined surface of the inner pipe 13 presses and slides on the outer surface of the wedge portion 17 forming the upper half of the wedge piece 15, and the wedge portion 17 elastically deforms from a substantially elliptical shape to a perfect circle upon receiving the pressing force. and the sliding inclined surface of the wedge piece storage chamber 11, creating a wedge effect.

Therefore, the inner surface of the wedge piece storage chamber 11 and the inner pipe 13
A large frictional resistance force is maintained between the outer surface of the wedge portion 17 that is elastically pressed by the outer pipe 10 even after the rotation of the outer pipe 10 is completed.

In this embodiment configured as above, the tightening operation of the telescopic tube will be explained.

A person who adjusts the dimensions of the telescopic tube by holding the inner pipe 13 and the outer pipe 10 in the left and right hands, respectively, twists the outer pipe 10 counterclockwise in FIG. A wedge effect is produced between the inner surface of the wedge piece storage chamber 11 and the outer circumferential surface of the inner pipe 13, and even if the outer pipe 10 and the inner pipe 13 are tightened under high frictional force and cleaning is performed afterwards, the adjustment dimension will not change. maintained.

Next, to untighten the telescopic tube, all you have to do is twist the outer pipe clockwise as shown in Figure 2, and the troublesome effort of rotating the tightening screw several times as in the prior art is eliminated. Not necessary.

〔effect〕

The present invention has the following effects.

(a) After adjusting the length of the telescoping tube by gripping the inner and outer pipes of the telescoping tube in each hand, hold the telescoping tube in both hands to tighten the telescoping tube. While being held, it is possible to perform an action of twisting either the outer pipe or the inner pipe in the tightening direction.

(b) The tightening force of the telescopic tube is maintained by the high frictional force due to the wedge effect.

(c) To release the tightening force of the telescopic tube, simply twist either the outer pipe or the inner pipe in the direction of releasing the tightening force, and then expand or contract the expandable tube without changing hands. be able to.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention.
The figure is a front sectional view of the telescopic tube, Fig. 2 is a side sectional view of the same as above, Fig. 3 is a side sectional view of the inner pipe, Fig. 4 is a perspective view of the wedge piece, and Fig. 5 is a perspective view of the outer pipe. 6 to 9 show a conventional example, FIG. 6 is a front sectional view of the telescopic tube, FIG. 7 is a front sectional view of the tightening spiral tube, and FIG. 8 is a front sectional view of the tightening ring. Figure, No. 9
The figure is a side view of the same as above. 10...Outer pipe, 11...Wedge piece storage chamber, 13
...Inner pipe, 14...Vertical groove, 15...Wedge piece, 1
6...Wedge section, 18...Protector.

Claims (1)

[Scope of utility model registration request] An elastically deformable inner pipe formed into a cylindrical shape with a substantially elliptical cross-sectional shape and having a vertical groove in the longitudinal direction on the major diameter side of the outer peripheral surface of the substantially elliptical cylindrical shape, and an inner pipe that can freely slide within the vertical groove. A wedge piece is inserted into the inner pipe and has a wedge shape with an upper half protruding above the outer peripheral surface of the inner pipe, and a concave wedge housing chamber having an inclined surface on the inner peripheral surface of the end portion to accommodate the upper half of the wedge piece. A telescopic tube comprising an outer pipe and a protector that covers the wedge piece storage chamber of the outer pipe.