JPH0449957Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is a general user's DIY (DO IT)
YOURSELF) Synthetic resin used as tension rods, etc., which are set between the legs of various tables, chairs, etc., or between the ceiling and the floor, or between opposing walls or columns, in structures assembled by work, etc. The present invention relates to an adjuster for a coated steel pipe which is attached to the end of a coated steel pipe coated with an adhesive and used for height adjustment, length adjustment, tensioning action, etc.

[Prior art] Conventionally, as the above-mentioned adjuster for coated steel pipes,
For example, the one shown in FIG. 5 or 6 is known.

The adjuster star 1 shown in Fig. 5 is attached to the end of a coated steel pipe 2 with a circular cross section and is used to adjust the height, and is glued to the outer periphery of the lower end of the coated steel pipe 2, which serves as the legs of various tables, chairs, etc. A cap 3 made of synthetic resin is airtightly fitted with an adhesive, and a nut 4 inserted into the bottom of the cap 3 is screwed into the shaft center of the cap 3 in the axial direction (in the vertical direction in Fig. 5). The seat bolt 6 is inserted so as to be movable forward and backward, and has a seat portion 6a that contacts the floor surface 5 at the outer end (lower end in FIG. 5).

In the above adjuster star 1, the height adjustment is as follows:
This is done by turning the seat bolt 6 in the appropriate direction.

Also, the adjuster star 7 in FIG.
It is attached to the end of a coated steel pipe 9 with a circular cross-section that is set between comrades and serves as a tension rod, and is used to adjust the length or provide tension, and is glued to the outer periphery of the right end of the coated steel pipe 9. A cap 10 made of synthetic resin is airtightly fitted with an adhesive, and a cap-shaped nut rotatably engaged with the outer periphery of the cap 10 to prevent it from moving in the axial direction (in the left-right direction in FIG. 6). 11 and is inserted into the axial center of the cap 10 so as to be movable in the axial direction, and has a seat portion 12a that abuts the wall 8 at the outer end (the right end in FIG. 6). It consists of

In FIG. 6, reference numeral 11a denotes an engaging protrusion protruding from the inner periphery of the open end of the nut 11, which engages with a circumferential groove 13 provided on the outer periphery of the cap 10 to prevent the nut 11 from moving in the axial direction. In order to facilitate engagement and disengagement of the engagement protrusion 11a with the circumferential groove 13, a plurality of axial slits 14 are provided at the open end of the nut 11, spaced apart in the circumferential direction. . or,
15 is a retainer attached to the inner end of the seat nut 11, and 16 is a non-slip rubber coated on the seat 12a. Further, reference numeral 17 denotes a synthetic resin cap that is airtightly fitted onto the outer periphery of the left end of the coated steel pipe 9 with an adhesive, and is covered with a non-slip rubber 18.

In the adjuster star 7, the length is adjusted or the tensioning action is applied by turning the nut 11 in an appropriate direction.

[Problem to be solved by the invention] However, the above-mentioned conventional Aziaster 1, 7
According to the above, although the caps 3, 10, and 17 are all airtightly fitted to the outer periphery of the coated steel pipes 2, 9, moisture cannot escape from the insertion portions of the seat bolts 6, 12. There is a problem that rust occurs from the inner peripheral portions of the coated steel pipes 2 and 9.

Therefore, an object of the present invention is to provide an adjuster for a coated steel pipe that can prevent rust from forming on the inner circumference of the coated steel pipe.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a cap made of synthetic resin that is airtightly fitted to the outer periphery of the end of a coated steel pipe that is adhesively coated with synthetic resin, and a cap that is attached to the cap. In an adjuster for coated steel pipes, the adjuster comprises a seat bolt that is screwed into a nut and is inserted into the shaft center of the cap so as to be able to move forward and backward in the axial direction, and that has a seat at its outer end. A sheathing tube that can be moved forward and backward and airtight is integrally formed with the cap, and a plurality of ribs in the axial direction are provided on the outer periphery of the sheathing tube, which abut the inner circumferential surface of the coated steel pipe.

[Function] According to the above means, the enveloping tube blocks moisture from entering through the insertion part of the seat bolt, and when the enveloping tube is forcibly inserted into the coated steel pipe, it is pushed by the contact surface of the rib. Due to the slight elastic deformation of the coated steel pipe, the slight elastic deformation of the entire sheathing cylinder including the ribs made of synthetic resin, etc., the assembly resistance of the rib to the coated steel pipe is reduced.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. In the following description, the same components as in FIG. 5 or 6 are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is a longitudinal cross-sectional view of the adjuster star 21 of the first embodiment. This adjuster is attached to the end of the coated steel pipe 2 and used for height adjustment. A nut 24 is attached by press-fitting or insert molding into a hole 23 at the center of the bottom of a synthetic resin cap 22 that is airtightly fitted with an adhesive. Further, a covering cylinder 25 is integrally formed at the inner bottom of the cap 22 to cover the inner end of the seat bolt 6 which is screwed into the nut 24 in a movable and airtight manner. The envelope cylinder 25 is formed into a cylindrical shape concentric with the cap 22 and has a closed upper end, and a plurality of ribs 26 radially extend around the outer periphery in a direction that contacts the inner circumferential surface of the sheathed steel pipe 2. It is provided.

In FIG. 1, 27 is a lock nut screwed onto the seat bolt 6.

In the adjuster star 21 having the above configuration, the height is adjusted by loosening the lock nut 27 and rotating the seat bolt 6 in an appropriate direction.

In addition, moisture that has entered the encapsulating tube 25 from the insertion portion of the seat bolt 6 is blocked from entering the coated steel pipe 2 by the encapsulating tube 25, and rusting from inside the coated steel tube 2 is prevented. Ru.

On the other hand, by making the outer diameter of the contact surface of each rib 26 slightly larger than the inner diameter of the coated steel pipe 2, inserting the envelope cylinder 25 into the coated steel pipe 2 and forcibly press-fitting it (for example, by driving it in with a mallet), the ribs 26 The assembly resistance of the ribs 26 to the coated steel pipe 2 is reduced due to slight elastic deformation of the coated steel pipe 2 when pressed by the contact surface or elastic deformation of the entire envelope cylinder 25 including the ribs 26 made of synthetic resin. The envelope cylinder 25 is easily, reliably and firmly assembled to the coated steel pipe 2 without swinging. Then, the cap 22 is attached to the coated steel pipe 2.
Glue and fix.

In this way, it is possible to provide an adjuster star that is easy to assemble, has a strong assembly, is strong, and has a long life without requiring special dimensional accuracy.

Also, even if some burrs remain on the inner circumference of the cut after cutting the coated steel pipe 2 with a roll cutter, it is difficult to completely remove the burrs with a normal hand-type chamfer. ), when the envelope cylinder 25 is inserted into the sheathed steel pipe 2 and forcedly press-fitted, the contact surface of the plurality of ribs 26 is easily cut away by the inner periphery of the cut end and press-fitted. It is extremely advantageous for general users' DIY work, etc., which is not mass-produced.

Figures 2 and 3 show the adjuster star 3 of the second embodiment.
In the vertical cross-sectional view and plan cross-sectional view of 1, this adjuster star 3
1 is used for height adjustment like the adjuster star 21 of the first embodiment, and a coated steel pipe 32
has a rectangular cut cross section, and the cap 33 has a rectangular shape corresponding to the coated steel pipe 32, and the seat portion 34a of the seat bolt 34 is attached by a spherical bearing 35 to correspond to the inclination of the floor surface 5. The adjuster star 21 is different from the adjuster star 21 of the first embodiment in that it is provided so as to be angularly adjustable. Since the other configurations and effects are substantially the same as those of the first embodiment, the same reference numerals are given to the constituent members etc. that perform the same functions, and the actual details thereof will be omitted.

FIG. 4 is a longitudinal cross-sectional view of an adjuster star 41 according to the third embodiment. A synthetic resin cap 42 that is airtightly fitted onto the outer periphery of the right end of the bolt 12 with adhesive is integrally formed with a covering cylinder 43 that can move forward and backward and airtightly cover the inner end of the seat bolt 12. There is. The enveloping cylinder 43 has a cap 42
It is formed into a cylindrical shape concentric with , and has an inner end closed, and a plurality of axial ribs 44 that come into contact with the inner peripheral surface of the coated steel pipe 9 are radially provided on its outer periphery.

In the adjuster star 41 having the above configuration, adjustment of the length and the like is performed by rotating the nut 11 in an appropriate direction.

Moreover, the effect of this adjuster star 41 is almost the same as that of the first and second embodiments, so
The explanation will be omitted.

[Effects of the invention] As described above, according to the invention, since the enveloping tube blocks moisture from entering through the insertion part of the seat bolt, it is possible to prevent rust from forming inside the coated steel pipe. .

On the other hand, if the outer diameter of the contact surface of each rib is made slightly larger than the inner diameter of the coated steel pipe, and the coated tube is inserted into the coated steel pipe and force-fitted, some of the coated steel pipe will be pushed by the contact surface of the ribs. Due to elastic deformation or elastic deformation of the entire encapsulating tube including ribs made of synthetic resin, the resistance of the ribs to the coated steel pipe is reduced, so the encapsulating tube can be assembled easily, reliably, and without swinging against the coated steel tube. Assembles firmly. and,
Glue and fix the cap to the coated steel pipe.

Thus, it is possible to provide an adjuster that is easy to assemble, has a strong assembly, and has a long life without requiring special dimensional accuracy.

In addition, even if there are some burrs left on the inner circumference of the cut end after cutting the coated steel pipe with a roll cutter, if the cover tube is inserted into the coated steel pipe and force-fitted, the contact surface of the multiple ribs will be removed. Since the unnecessary portion of the material can be easily cut off and press-fitted by the inner peripheral edge of the cut end, this effect is extremely advantageous in DIY work by general users, rather than mass production in factories.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention. FIG. 1 is a longitudinal sectional view of the adjuster star of the first embodiment, FIG. 2 is a longitudinal sectional view of the adjuster star of the second embodiment, and FIG. The figure is a sectional view taken along the line -- in FIG. 2, FIG. 4 is a longitudinal sectional view of the adjuster star of the third embodiment, and FIGS. 5 and 6 are longitudinal sectional views of the conventional adjuster star. 1...Coated steel pipe, 6...Bolt with seat, 6a...
Seat portion, 9...Coated steel pipe, 11...Nut, 12...
...Seat bolt, 12a...Bottom, 17...Cap, 21...Adjuster star, 22...Cap,
24... Nut, 25... Covering tube, 26... Rib, 31... Adjuster star, 32... Covered steel pipe,
33... Cap, 34... Seating bolt, 34a
...Seat part, 41...Asia star, 42...Cap, 43...Encapsulation tube.

Claims (1)

[Scope of utility model registration request] A synthetic resin cap is airtightly fitted onto the outer periphery of the end of a coated steel pipe coated with a synthetic resin adhesive, and the cap is screwed into a nut attached to the cap and inserted into the axial center of the cap so that it can move forward and backward in the axial direction. , an adjuster for coated steel pipes consisting of a seat bolt having a seat portion at the outer end, in which an envelope tube is integrally formed with the cap, and the inner end of the seat bolt is movably and retractably covered in an airtight manner; An adjuster for a coated steel pipe, characterized in that a plurality of ribs in the axial direction are provided on the outer periphery of the envelope, the ribs coming into contact with the inner peripheral surface of the coated steel pipe.