JPH0596522U - Expansion rod sleeve mounting structure - Google Patents

Abstract

(57) [Summary] [Purpose] To enable a sleeve to be easily and firmly attached to a stainless steel pipe with an expansion rod. [Structure] The telescopic rod includes an outer pipe 2 made of stainless steel and a sleeve 4 attached to the outer pipe 2. The sleeve 4 includes an outer tubular wall portion 5, an inner tubular wall portion 6 inside thereof,
The outer cylinder wall portion 5 and the inner cylinder wall portion 6 are provided with a connection wall portion 7 that connects the one end side. Further, the sleeve 4 penetrates the outer cylindrical wall portion 5 and the inner cylindrical wall portion 6, the ring-shaped groove portion 8 formed between the outer cylindrical wall portion 5 and the inner cylindrical wall portion 6 and opening to the other end side. Through hole 9 ...
And The end portion of the outer pipe 2 is fitted into the ring-shaped groove portion 8. The processing tool 11 is inserted through the through-holes 9 ... And the end portion of the outer pipe 2 is plastically deformed to form the protrusions 10. The protrusions 10 project into the through holes 9 to prevent the sleeve 4 from coming off.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sleeve mounting structure for a telescopic rod.

[0002]

[Prior Art]

 Conventionally, as shown in FIG. 6, a telescopic rod provided with an outer pipe a made of metal and an inner pipe b made of metal which is inserted into the outer pipe a by extension and shortening automatically, the outer pipe a An adhesive was used to attach the resin sleeve c to the end.

By the way, as shown in FIG. 7, the conventional outer pipe a (and inner pipe b) has a relatively outer peripheral surface of a normal steel pipe main body f covered with an outer coating layer e made of stainless steel. It was a thick pipe.

[0004]

[Problems to be solved by the device]

 However, in the conventional expansion rod as described above, since the sleeve c is fixed to the outer pipe a 1 with an adhesive, its workability is poor and it is difficult to inspect the adhesive strength.

Therefore, the present invention solves the above-mentioned drawbacks, improves workability in manufacturing, and provides a sleeve mounting structure for an expansion rod that facilitates non-destructive inspection / confirmation of sleeve strength. To aim.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the sleeve mounting structure of the expansion rod according to the present invention is an expansion and contraction device including an outer pipe made of stainless steel and an inner pipe made of stainless steel which is inserted into the outer pipe so as to be able to extend and shorten. In the structure for attaching a sleeve to the end portion of the outer pipe of the rod, the sleeve has an outer cylinder wall portion, an inner cylinder wall portion inside thereof, and the outer cylinder wall portion and the inner cylinder wall portion at one end. And a ring-shaped groove portion formed between the outer tubular wall portion and the inner tubular wall portion and opening to the other end side, and an outer tubular portion. A radial through hole penetrating the wall portion and the inner tubular wall portion and communicating with and connected to the ring-shaped groove portion, and inserting the wall portion at the end portion of the outer pipe into the ring-shaped groove portion, The inserted wall is plastically deformed to form a protrusion that protrudes into the through hole, and the sleeve is removed. Are those that you have configured Mesuru so.

In addition, another sleeve mounting structure for an elastic rod according to the present invention is an elastic rod having an outer pipe made of stainless steel and an inner pipe made of stainless steel which is inserted into the outer pipe so as to extend and shorten. In the structure in which the sleeve is attached to the end of the outer pipe, a circumferential ridge is formed in the middle of the sleeve, and the end of the inner peripheral surface of the outer pipe is plastically deformed in the circumferential direction. A groove is formed, the sleeve is inserted into the end of the outer pipe, and the protrusion of the sleeve is inserted into the groove of the outer pipe to prevent the sleeve from coming off. ..

[0008]

[Action]

 In the sleeve mounting structure of the expansion rod of the present invention, by inserting the tip of a plastic working tool such as a punch into the through hole of the sleeve, the wall portion of the end portion of the outer pipe fitted in the ring-shaped groove portion of the sleeve is inserted. The protrusion can be easily formed by plastic deformation. The formed projection is locked in the through hole of the sleeve to prevent the sleeve from coming off.

In addition, in the sleeve mounting structure for another expansion rod of the present invention, the circumferential groove portion of the outer pipe can be easily formed by plastic deformation. Then, the protrusion of the sleeve is locked in the groove of the outer pipe to prevent the sleeve from coming off.

[0010]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the drawings illustrating an embodiment.

FIG. 2 shows a telescopic rod 1 having an embodiment of the sleeve mounting structure for the telescopic rod according to the present invention.

This telescopic rod 1 is used as a clothes rod, and includes an outer pipe 2 made of stainless steel, and inner pipes 3, 3 made of stainless steel which are inserted into the outer pipe 2 so as to be easily shortened. And sleeves 4 and 4 made of resin attached to the end of the outer pipe 2.

Therefore, as shown in FIG. 1, in the sleeve mounting structure for a telescopic rod according to the present invention, the sleeve 4 includes an outer cylinder wall portion 5, an inner cylinder wall portion 6 inside thereof, and an outer cylinder. A connecting wall portion 7 that connects the wall portion 5 and the inner cylindrical wall portion 6 at one end side is provided.

The sleeve 4 has a ring-shaped groove portion 8 formed between the outer tubular wall portion 5 and the inner tubular wall portion 6 and opening to the other end side, the outer tubular wall portion 5 and the inner tubular wall portion. 6 and a radial through hole 9 ... which is connected to the ring-shaped groove portion 8 so as to communicate therewith.

Then, the wall portion of the end portion of the outer pipe 2 is fitted into the ring-shaped groove portion 8 and the fitted wall portion is plastically deformed to form a protrusion 10 which is inserted into the through hole 9 to form a sleeve. It is configured to prevent 4 from coming off.

Further, in order to form the protrusion 10 by plastic deformation, the tip of the processing tool 11 such as a punch shown by an imaginary line is inserted into the through hole 9 from the outside of the sleeve 4 and the end portion of the outer pipe 2 is inserted. Plastically deform the wall of. The through-hole 9 is preferably circular, elliptical or slit-shaped.

With this configuration, the protrusion 10 that protrudes into the through hole 9 on the inner cylinder wall portion 6 side can be easily formed. The protrusion 10 is plastically deformed to the extent that it does not protrude from the inner peripheral surface of the inner cylinder wall 6.

Further, in this embodiment, the four through holes 9 and the protrusions 10 are provided at a pitch of about 90 ° along the circumferential direction of the sleeve.

The thickness T of the outer pipe 2 and the inner pipe 3 made of stainless steel is about 0.3 mm to 0.6 mm.

In this embodiment, the number of through holes 9 ... Is not limited to four, but may be one, two, three, or five or more.

Further, in this embodiment, the outer cylinder wall portion 5 has a length dimension shorter than that of the inner cylinder wall portion 6 so that the appearance is good. Note that the outer cylinder wall portion 5 and the inner cylinder wall portion 6 may have substantially the same length dimension.

Next, (returning to FIG. 2), the inner pipes 3 and 3 of the telescopic rod 1 are caulked to the inner end sides of the respective inner pipes 3 and 3, which are freely fixable at arbitrary lengths. It is fixed.

The brake portion 12 has a large diameter portion 13 that slides in the longitudinal direction on the inner peripheral surface of the outer pipe 2, and the large diameter portion 13 has a groove whose depth dimension changes depending on the circumferential position. Is formed, and the stopper piece 20 is fitted in the groove.

By rotating the inner pipe 3 in the circumferential direction, the stopper piece 20 is sandwiched between the bottom surface of the groove of the brake portion 12 and the inner peripheral surface of the outer pipe 2. As a result, the inner pipe 3 can be fixed to the outer pipe 2.

Further, by rotating the inner pipe 3 in the opposite direction, the inner pipe 3 becomes movable.

By the above-mentioned operation, this telescopic rod 1 can be set to an arbitrary length.

Further, cap members 14, 14 are fixed to the outer ends of the respective inner pipes 3, 3 with an adhesive agent, and the cap members 14, 14 are formed slightly closer to the inner ends than the cap members 14, 14 by plastic working. Annular ridges 15, 15 are formed.

When the inner pipes 3, 3 are inserted into the outer pipe 2, as shown by the arrow A, the annular ridges 15, 15 of the inner pipes 3, 3 are attached to the tips of the sleeves 4, 4. When they come into contact with each other, insertion of the inner pipes 3 is restricted. In this state, the total length is the shortest.

Further, as shown by an arrow B in FIG. 3, when the inner pipe 3 is pulled out from the outer pipe 2, the large-diameter portion 13 of the brake portion 12 contacts the inner end of the inner cylindrical wall portion 6 of the sleeve 4. Upon contact, the inner pipe 3 is prevented from coming off. In this state, the total length is the longest.

Further, at the time of this contact, since the projections 10 of the inner pipe 3 are caught in the through holes 9 of the sleeve 4, there is no risk of the sleeve 4 falling off.

In the telescopic rod 1 of this embodiment, the inner pipes 3, 3 are provided on both the left and right sides, but it is also preferable to provide the inner pipe 3 on only one side.

The elastic rod mounting structure of the present invention can be used for various elastic rods such as a pole of a clothes rod and an expandable cane in addition to the clothes rod.

Next, FIG. 4 shows another embodiment of the sleeve mounting structure for the expandable rod of the present invention. In this embodiment, a circumferential ridge 16 is formed in the middle of the sleeve 4. That is, the sleeve 4 has the small-diameter wall portion 21 on the inner end side of the protrusion 16 and the wall portion having the outer flange 19 on the tip side of the protrusion 16.

A circumferential groove 17 is formed by plastic deformation at the end of the inner peripheral surface of the outer pipe 2 made of stainless steel and having a thickness of about 0.3 mm to 0.6 mm.

Then, the sleeve 4 is inserted into the end portion of the outer pipe 2, and the protrusion 16 of the sleeve 4 is inserted into the groove portion 17 of the outer pipe 2 to prevent the sleeve 4 from coming off. ..

In the manufacturing process, first, the large-diameter wall portion 18 is formed on the end portion of the outer pipe 2 by plastic working so as to have a step, and the end portion of the large-diameter wall portion 18 is shown in the figure. As shown by the line, open the diametrically expanded shape.

Then, the sleeve 4 is inserted into the outer pipe 2, and the ridge 16 is fitted into the large-diameter wall portion 18.

In this state, the end portion of the large-diameter wall portion 18 of the outer pipe 2 shown by the imaginary line is bent at a substantially right angle inwardly of the peripheral wall by plastic deformation. In this way, the projection 16 of the sleeve 4 is fitted into the groove 17 at the same time when the groove 17 is formed.

Next, FIG. 5 shows a modified example of the embodiment of FIG. 4, in which case an outer collar portion is not formed at the tip of the sleeve 4 and a small diameter wall portion 21 on the inner end side is provided at the tip side. The walls with the same diameter were formed.

[0040]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

According to the expansion rod attachment structure of the first aspect, the resin sleeve 4 can be easily and firmly attached even though the outer pipe 2 is made of stainless steel. And durability improves.

Further, if the outer pipe 2 is made of stainless steel, the wall thickness can be reduced, the processing is facilitated, and the entire weight can be reduced.

Further, according to the expansion rod attaching structure of the second aspect, the same effect as that of the first aspect can be obtained.

[Brief description of drawings]

FIG. 1 is a half sectional view showing an embodiment of a sleeve mounting structure for a telescopic rod according to the present invention.

FIG. 2 is a half cross-sectional view showing an embodiment of a telescopic rod.

FIG. 3 is a partial cross-sectional view of a main part.

FIG. 4 is a half cross-sectional view showing another embodiment.

FIG. 5 is a half sectional view showing a modified example.

FIG. 6 is a half cross-sectional view showing a conventional example.

FIG. 7 is an enlarged half cross-sectional view of a main part of a conventional example.

[Explanation of symbols]

 2 Outer pipe 3 Inner pipe 4 Sleeve 5 Outer cylinder wall 6 Inner cylinder wall 7 Connection wall 8 Ring groove 9 Through hole 10 Projection 16 Projection 17 Groove

Claims (2)

[Scope of utility model registration request] 1. A telescopic rod 1 having an outer pipe 2 made of stainless steel and an inner pipe 3 made of stainless steel which is inserted into the outer pipe 2 so as to be able to be stretched and shortened. In the structure for mounting, the sleeve 4 connects the outer cylinder wall portion 5, the inner cylinder wall portion 6 inside thereof, the outer cylinder wall portion 5 and the inner cylinder wall portion 6 at one end side. Connection wall portion 7,
And the sleeve 4 includes a ring-shaped groove portion 8 formed between the outer cylinder wall portion 5 and the inner cylinder wall portion 6 and opening to the other end side, the outer cylinder wall portion 5 and the inner cylinder. A radial through hole 9 which penetrates the wall portion 6 and is communicated and connected with the ring-shaped groove portion 8.
, And the wall portion at the end portion of the outer pipe 2 is fitted into the ring-shaped groove portion 8, and the fitted wall portion is plastically deformed to project into the through hole 9. A sleeve mounting structure for a telescopic rod, characterized in that the sleeve 4 is formed so as to prevent the sleeve 4 from coming off. 2. An expandable rod 1 comprising an outer pipe 2 made of stainless steel and an inner pipe 3 made of stainless steel which is inserted into the outer pipe 2 so as to be capable of being stretched and shortened. In the mounting structure, a circumferential protrusion 16 is formed in the middle of the sleeve 4, and a circumferential groove 17 is formed by plastic deformation at the end of the inner peripheral surface of the outer pipe 2, The sleeve 4 is inserted into the end portion of the pipe 2, and the projection 16 of the sleeve 4 is inserted into the groove portion 17 of the outer pipe 2 to prevent the sleeve 4 from coming off. Stretchable rod sleeve mounting structure.