JPS628475Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an extensible tube, and more particularly, to a structure for preventing the extensible tube from coming off, which expandably connects tube bodies such as an extension tube of a vacuum cleaner.

[Technical background of the invention and its problems]

In conventional extensible tubes such as extension tubes of this type of vacuum cleaner, a retaining ring is fixed to the outer surface of the connection end of the small-diameter first tube body by gluing or the like. A locking ring that is engaged with the retaining ring is fixed to the inner surface of the connecting end of a second tube body with a large diameter into which the body can be inserted and moved forward and backward, and the second tube body is A tightening ring is screwed onto the tightening tube that is fixed to the connecting end by adhesive or the like, and by tightening the tightening ring, the tightening portion of the tightening tube is crimped to the outer peripheral surface of the first tube. In this structure, the first tube body and the second tube body are
A retaining ring, a locking ring, etc. must be attached to the tube body with adhesive, etc., and it has the disadvantage that it requires a large number of parts and is time-consuming to assemble.

For this purpose, as shown in Japanese Utility Model Publication No. 41-25251, an engagement hole is formed in the first tube, and the engagement hole is formed on the inner peripheral surface of the tightening tube fitted to the first tube. A protrusion is provided to protrude to be engaged with, and the protruding end of the engagement hole of the protrusion is engaged with an annular protrusion formed on the outer peripheral surface of the second tube that is inserted into the first tube, and the second tube is inserted into the first tube. A structure is known in which the clamping tube is held in place, but in this structure, a cut groove is formed over the entire length of the clamping tube, and while the tightening tube expands from the groove, the protrusion engages with the through hole and is fitted. It has the disadvantage of poor assembly efficiency.

[Purpose of invention]

The present invention was created in view of the above drawbacks, and the first
By simply fitting the tightening tube to which the second tube is connected, the tightening tube is held in place by the first tube, and a separate retaining ring, locking ring, etc. To provide an extensible tube that does not need to be used, has a small number of parts, is inexpensive, and can be easily assembled in an extensible and retractable manner.

[Structure of the idea]

The configuration of the present invention includes a first tube 5 having a small diameter, a tightening tube 7 slidably fitted on the outer periphery of the first tube 5, and a tube connected to the tightening tube 7. A second tube body 6 having an inner diameter into which the first tube body 5 can be inserted in a freely advancing and retractable manner; It consists of a tightening ring 8 that presses against the outer circumferential surface of the first tube 5, and a connection end 9 with an enlarged diameter is formed on the outer periphery of one end of the first tube 5, and this enlarged diameter connection The outer peripheral surface of the end portion 9 is provided with a groove-like groove having a stepped portion 25 that is open on both end surfaces in the axial direction of the connecting end portion 9, faces in the axial direction of the connecting end portion 9, and is bent in the circumferential direction in the middle. Engagement guide portions 11 are formed at intervals in the circumferential direction, and an engagement guide portion 11 formed at the connection end portion 9 of the first tube body 5 is provided on the inner peripheral surface of one end side of the tightening tube body 7. An engaging portion 13 that is removably inserted into the body is formed protruding in the circumferential direction at the same interval as the engaging guide portion 11, and an axial tightening cut is provided at one end of the tightening tube 7. Grooves 14 are formed between the engaging portions at intervals in the circumferential direction, and the other end of the tightening tube 7 has a connecting portion 17 into which the second tube 6 is inserted and connected. A tapered tightened surface 15 that expands toward the other end is fastened to the inner surface of the tightening ring 8 on the outer peripheral surface of one end of the tightening tube 7. A clamping surface 19 is formed in pressure contact with the outer circumferential surface of the tube body 5, and the engaging part 13 of the clamping tube body 7 is fitted into the engagement guide part 11 from one end of the connecting end part 9. 1, and the tightening tube 7 is rotated in the circumferential direction at a position where the engagement portion 13 is removed from the other end side of the engagement guide portion 11. The engaging portion 13 is moved to engage the other end surface of the connecting end portion 9 to hold the tightening tube body 7 in the first tube body 5 so as not to come off.

[Example of idea]

Next, the structure of an embodiment of the present invention will be explained with reference to the drawings.

Reference numeral 1 denotes a vacuum cleaner that includes an electric blower (not shown) and a filter that traps dust sucked into the electric blower. An extension pipe 3 is connected to the extension pipe 3, and a suction port body 4 such as a floor brush is connected to this extension pipe 3.

Next, the extension tube 3 includes a first tube body 5 with a small diameter, a second tube body 6 with a large diameter into which the first tube body 5 can be inserted;
It is composed of a tightening tube body 7 and a tightening ring 8.

The first tubular body 5 is molded from synthetic resin, and has a connecting end 9 with an enlarged diameter formed on the outer periphery of one end. On the outer circumferential surface of the connecting end 9, axial groove-like engagement guide portions 11 which are open on both end surfaces of the connecting end 9 are formed at predetermined intervals in the circumferential direction. Then, a stepped portion 2 is formed in the middle of the engagement guide portion 11 of the first tube body 5 to match the length of the engagement portion 13 of the tube body 7, which will be described later.
5 and is bent and displaced in the circumferential direction.

Next, the second tube 6 is molded from synthetic resin, has an inner diameter that allows the connection end 9 of the first tube 5 to be inserted through it, and has a diameter larger than that of the first tube 5. Largely formed.

Further, the tightening tube body 7 is molded from synthetic resin,
It has an inner diameter large enough to fit the connection end 9 of the first tube 5.

An axial engagement portion 13 that is removably inserted into the engagement guide portion 11 of the first tube 5 is provided on the inner circumferential surface of one end of the tightening tube 7. It protrudes at the same interval as the guide portion 11. The length of this engaging part 13 is formed to be long enough to pass through the step part 25 in the middle of the engaging guide part 11 of the first tube body 5, and this engaging part 13 is connected to the engaging guide part 11. The end portion 9 is fitted from the open portion on one end surface side, and at a position where the engagement portion 13 is removed from the other end of the engagement guide portion 11, either the first tube body 5 or the tightening tube body 7 is inserted. Rotating in the circumferential direction, the engaging portion 13 is engaged with the end surface of the connecting end 9 of the first tube 5, and the tightening tube 7 is held in the first tube 5 without coming off. It's becoming like that. An axial tightening groove 14 is formed in the tightening part 12 at one end of the tightening tube 7 and is located between the engaging parts 13 and spaced apart in the circumferential direction. A substantially tapered tightened surface 15 is formed on the outer circumferential surface of one end of the body 7 and extends toward the other end.
Further, a thread 16 is formed on the outer circumferential surface of this tightening tube body 7.

Furthermore, a connecting portion 17 whose inner circumferential surface is enlarged in diameter is formed at the other end of this tightening tube 7 so that the second tube 6 can be fitted thereinto.
Insert and secure by gluing, etc. In this state, the inner circumferential surface of the second tube 6 and the inner circumferential surface of the tightening tube 7 are approximately on the same plane.

Further, the tightening ring 8 that is screwed onto the thread 16 of the tightening tube 7 has a thread groove 18 formed on its inner circumferential surface, and has a threaded groove 18 formed on the inner surface of one end to tighten the tightened surface 15 of the tightening tube 7. A tightening surface 19 that presses the inner surface of the engaging portion 13 against the outer periphery of the first tube 5 is formed in a tapered shape.
Further, at one end of this tightening ring 8, the first tube body 5 is attached.
A reduced diameter portion 20 is formed to rub against the outer circumferential surface of the tube.

Next, the operation of this embodiment will be explained.

When assembling, when the tightening tube 7 is fitted to the connection end 9 of the first tube 5 and the engagement portion 13 is fitted into the engagement guide portion 11 from one end surface side of the connection end 9, the engagement portion 13 is inserted and slid into the engagement guide part 11, and at a position where the engagement part 18 engages with the stepped part 25, the tightening tube body 7 is rotated in the circumferential direction to further engage the engagement part 13. The first tube body 5 is slid onto the guide portion 11, and with the engagement portion 13 disengaged from the other end of the engagement guide portion 11.
Alternatively, if either one of the tightening tubes 7 is rotated in the circumferential direction, the positions of the engagement guide part 11 and the engagement part 13 are shifted in the circumferential direction, and the tightening tube 7 is rotated in the first The tube body 5 securely prevents it from coming off.

Then, when the first tubular body 5 is advanced and retreated from the second tubular body 6 and the length is adjusted, the clamping ring 8 is tightened. The inner circumferential surface of the engaging portion 13 is pressed against the tightened surface 15 of the
The first tube 5 is in pressure contact with the outer periphery of the tube 5 , and the first tube 5 is fixed to the second tube 6 . Further, when adjusting the length, loosen the tightening ring 8 and move the first tube body 5 forward and backward.

Further, when removing the tightening tube 7 from the first tube 5, rotate the first tube 5 or the tightening tube 7 in the circumferential direction to move the engagement portion 13 to the engagement guide portion 11. When the engaging portion 13 engages with the stepped portion 25 while pulling the first tube 5 and the tightening tube 7 in the direction away from each other, the tightening tube 7 is rotated in the circumferential direction. By moving the engaging portion 13, the width of the engaging portion 13 is elastically reduced, the engaging guide portion 11 is moved, and the tightening tube 7 can be removed from the first tube 5.

[Effect of idea]

According to the present invention, a connecting end with an enlarged diameter is formed on the outer periphery of one end of the first pipe body, and the outer peripheral surface of the connecting end is open to both end surfaces of the connecting end, and a circumferential portion is formed in the middle. A groove-shaped engagement guide part having a stepped part bent in the direction is formed, and the engagement part fitted into the engagement guide part is connected to the inner peripheral surface of one end of the tightening tube to which the second tube body is connected. Since the engaging part of the tightening tube is fitted into the engagement guide part of the first tube, the tightening tube is fitted to the first tube, and the tightening tube is circumferentially By rotating the engaging portion in the direction and engaging the end surface of the connecting end, the tightening tube is held so as not to come off from the first tube. The tightened tube connecting the two tubes can be held in place by the first tube with a simple operation, and the number of parts is small, ease of assembly is improved, and assembly is possible at low cost. In addition, even if the engaging part is inserted into the open part of the engaging guide part from the other end surface of the connecting end, the engaging part is prevented from sliding by the stepped part, and the tightening pipe body is reliably moved from the first pipe body. It is held securely in place.

[Brief explanation of the drawing]

Fig. 1 is a side view of a vacuum cleaner showing an embodiment of the present invention, Fig. 2 is a vertical cross-sectional view of the expandable pipe as above, and Fig. 3 is an assembly process of the first pipe body and the tightening pipe body as above. FIG. 4 is a front view of the connecting end of the first pipe body. 5...First pipe body, 6...Second pipe body, 7...
Tightening pipe body, 8... Tightening ring, 9... Connection end, 10
...Other end surface of the connection end 9, 11...Engagement guide portion, 13...Engagement portion, 14...Kitch, 15...Tightened surface, 19...Tightening surface, 25...Step Department.

Claims (1)

[Scope of utility model registration request] a first tube with a small diameter; a tightening tube slidably fitted on the outer periphery of the first tube; and a tightening tube connected to the tightening tube so that the first tube can move forward and backward. a second tube having an inner diameter that can be fitted into the second tube, and a tightening ring rotatably screwed onto the outer periphery of the tightening tube and pressing the tightening tube against the outer circumferential surface of the first tube. A connecting end with an enlarged diameter is formed on the outer periphery of one end of the first pipe body, and a connecting end with an enlarged diameter is formed on both end faces in the axial direction of the connecting end. Groove-like engagement guide portions are formed at intervals in the circumferential direction and have stepped portions that are open and face in the axial direction of the connecting end and are bent in the circumferential direction, and the one end of the tightening tube An engaging part that is removably inserted into the engaging guide part formed at the connecting end of the first tube is provided on the inner circumferential surface of the first tube at the same interval as the engaging guide part in the circumferential direction. an axial tightening groove is formed at one end of the tightening tube to protrude between the engaging portions and spaced from each other in the circumferential direction; is formed with a connection portion into which the second tube is inserted and connected, and a tightened member is formed on the inner surface of the tightening ring in a tapered shape that expands toward the other end on the outer peripheral surface of one end of the tightening tube. forming a clamping surface that clamps the surface and presses the clamping tube against the outer circumferential surface of the first tube;
The engaging portion of the tightening tube is fitted into the engagement guide portion from one end of the connection end, the tightening tube is fitted to the outer periphery of the first tube, and the engaging portion is inserted into the engaging portion. The tightening tube is rotated in the circumferential direction at a position away from the other end of the mating guide portion, and the engaging portion is engaged with the other end surface of the connecting end, so that the tightening tube is attached to the first tube. A telescopic tube that holds the body in place.