JPH0442477Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a bush for a pipe shutter used in a connecting portion of a link plate that connects a large number of pipes in a lattice shape.

[Prior Art] Conventionally, as shown in FIG. 4, a short cylindrical body formed around a pipe support hole 2 has been used in a connecting portion of a link plate that connects a large number of pipes in a grid pattern in a pipe shutter. 1 constitutes a bush, and link plate support shafts 4, 4 are attached to both ends of the outer periphery of the short cylindrical body 1.
At the same time, a pipe shutter is constructed by inserting the shaft hole 3a of the link plate 3 into the link plate support shaft parts 4, 4 and sequentially connecting the pipes in the vertical direction.

And to prevent the link plate 3 from coming off,
In the case of a bush made of metal or synthetic resin, the edge of the support shaft 4 may be caulked or thermally deformed to prevent it from coming off, or as shown in the figure, a spacer pin 5 may be used to secure the link. Processing such as fixing the plates 3, 3 together is performed.

However, once the above-mentioned removal prevention treatment is applied, the length of the pipe shutter cannot be changed on site, and in addition, in the removal prevention treatment using the spacer pin 5, the pin 5 is exposed to the outside. There was a problem with being exposed and looking unsightly.

Therefore, as shown in FIG. 5, an annular groove into which the shaft hole 3a of the link plate 3 is fitted is formed on both sides of the outer periphery of a short cylindrical body 1' made of appropriately elastic synthetic resin and having a pipe support hole 2 formed in the center. 6, and the outer peripheral surface of the outer flange 6a of the annular groove 6 is a tapered surface 6b whose diameter decreases toward the outside, and several grooves 7 reaching the annular groove 6 from the outer end surface are formed on both sides. When the shaft hole 3a of the link plate 3 is strongly pressed against the conical surface 6b of the outer flange 6a of the annular groove 6, the outer flange 6a is bent inward as the split groove 7 is deformed and reduced. The shaft hole 3a passes over the outer flange 6a and enters the annular groove 6.
After fitting, the outer flange 6a returns to its reduced diameter due to its own elasticity, and the link plate 3 is prevented from coming out.

[Problems to be solved by the invention] Since the above-mentioned improved bushing does not use caulking means, it is possible to extend or shorten the length of the pipe shutter at will on site. Since it is divided into several pieces by the groove 7, the strength in the direction supporting the link plate 3 is particularly weak.
Due to frequent opening and closing of the shutter, the annular groove 6 often breaks, causing a problem in which the link plate 3 slips out.

The present invention was devised in view of the above-mentioned actual situation and to eliminate the drawbacks of the conventional ones. It can be easily attached and detached, and it is easy to assemble the pipe shutter on site and disassemble it when changing the pipe length.It also improves the strength of the link plate support shaft. The object of the present invention is to provide a bushing for a pipe shutter that can prevent parts from being damaged and link plates from falling off.

[Means for Solving the Problems] The technical means adopted by the present invention to solve the above problems is to have appropriate elasticity, to have a pipe support hole for the pipe shutter in the center, and to have pipe support holes at both ends of the outer periphery. In a short cylindrical bush for a pipe shutter, each of which has an annular groove that fits into the shaft hole of the link plate, and the outer circumferential surface of the outer flange of the annular groove has a diameter reduced outward to form a tapered surface, The pipe support hole is formed as a polygonal hole in which the pipe is inscribed, and the cylindrical wall of the bushing has a wall thickness that continuously changes in the circumferential direction, and thick and thin parts are alternately formed along the entire length. It is characterized by:

[Operation of the invention] Therefore, according to the invention, by applying the shaft hole of the link plate to the outer circumferential tapered surface of the outer flange portion in which the annular groove is formed and pressing strongly, the thin part of the annular groove becomes the thick part. The diameter of the outer flange portion is reduced inwardly, and the shaft hole of the link plate can easily pass over the outer flange portion due to the reduced diameter of the outer flange portion. After the link plate is fitted into the annular groove, the reduced diameter state is released by the elastic return of the outer flange part itself, and the link plate is prevented from slipping out.

At this time, the link plate is inserted into the annular groove,
Since there is no split groove for removal, the strength of the annular groove itself will not be compromised, and even if the shutter is opened and closed frequently, the link plate support shaft formed on the bushing will be damaged, and the link plate will not be damaged. falling off, etc. can be prevented.

[Example] The configuration of the present invention will be described in detail with reference to an example shown in the drawings.

FIG. 1 is a front view of the bush of the present invention, FIG. 2 is a longitudinal sectional view of the bush, and FIG. 3 is a partial front view of a pipe shutter using the bush.

In the figure, 10 is a bush for a pipe shutter according to the present invention, and the bush 10 is formed into a short cylindrical shape from a synthetic resin material having appropriate elasticity.
A pipe support hole 11 for supporting the pipe 9 of the pipe shutter 8 is formed in the center, and a boss portion 12 of the link plate 3 has a diameter larger than that of the shaft hole 3a of the link plate 3 and has a predetermined width. Annular grooves 13, 13 into which the shaft hole 3a is fitted are formed. Further, the outer flanges 14, 14 formed on the sides of both the annular grooves 13, 13 have a tapered surface 14a having a slightly larger diameter than the shaft hole 3a of the link plate 3, and whose diameter decreases toward the outside on the outer peripheral surface. It is formed.

On the other hand, the pipe support hole 11 formed in the bush 10 has a cylindrical wall formed in a concave shape over the entire length by three curved lines, and has a thick wall portion 13a in which the outer circumferential surface of the pipe 9 is inscribed. The outer peripheral surface of the pipe 9 is configured to have an unequal thickness in which thin-walled portions 13b that are spaced apart are continuously alternated.

Although the pipe support hole 11 in this embodiment has a rounded triangular shape with three curved peaks, it can also have a polygonal shape that is more than a triangle.

In the configuration as described above, in order to fit the link plate 3 into the annular grooves 13, 13 of the bush 10, first, each axis of the two link plates 3 to be connected is If the holes 3a, 3a are applied and pressed strongly, the thin wall portion 13b is compressed between the thick wall portions 13a, 13a, the flange portion 14 of the annular groove 13 is inwardly reduced in diameter, and the link plate 3 is moved into the annular groove. It is inserted into 13. After fitting, the flange portion 14 returns to its original shape by its own elastic force, and the link plate 3 is prevented from coming off.

Then, as described above, a predetermined number of link plates 3 are sequentially connected in the length direction by bushes 10, and the pipes 9 are inserted into the pipe support holes 11 of each bush 10 to form a grid as shown in FIG. If you assemble it, Pipe Shutter 8 will be completed.

In addition, when removing the link plate 3, when the outer periphery of the flange part 14 is pressed, the thin part 13b is compressed between the thick parts 13a and 13a of the annular groove 13, and the flange part 14 is reduced. diameter. The link plate 3 can be easily removed from the annular groove 13 by pulling the shaft hole 3a of the link plate 3 outward from both ends of the bush 10 in this reduced diameter state.

[Effect of the invention] In short, the invention has appropriate elasticity,
It has a pipe support hole for the pipe shutter in the center, and annular grooves that fit into the shaft holes of the link plate are formed at both ends of the outer periphery, and the outer peripheral surface of the outer flange part of the annular groove is reduced in diameter toward the outside. In the bush for a short cylindrical pipe shutter with a tapered surface, the pipe support hole is formed as a polygonal hole in which the pipe is inscribed, and the cylindrical wall of the bush has a wall thickness that continuously changes in the circumferential direction. Since thick-walled parts and thin-walled parts are alternately formed over the entire length, the bushing and the link plate can be easily attached and detached without creating a groove in the flange of the bushing, and can be easily installed and removed on-site. In addition to making it easy to assemble the pipe shutter and disassemble and assemble it when changing the pipe length, it also improves the strength of the annular groove itself, preventing damage to the link plate support shaft and falling off of the link plate. This has very useful practical effects, such as being able to prevent this from happening and improving the durability of the pipe shutter.

[Brief explanation of the drawing]

The drawings show an embodiment of the bush for a pipe shutter according to the present invention, in which Fig. 1 is a front view of the bush, Fig. 2 is a longitudinal cross-sectional view of the bush, and Fig. 3 is a longitudinal sectional view of the bush. FIG. 4 is a front view showing assembly using a conventional pipe shutter bushing, and FIG. 5 is a perspective view of another conventional pipe shutter bushing. In the figure, 1, 1'... short cylinder, 2, 11... pipe support hole, 3... link plate, 3a... shaft hole, 4... link plate support shaft, 6, 13...
Annular groove, 6a...flange, 6b, 14a...tapered surface, 7...divided groove, 8...pipe shutter,
9...Pipe, 10...Pipe shutter bushing, 12...Boss part, 13a...Thick wall part, 13
b... Thin wall portion, 14... Outer flange portion.

Claims (1)

[Scope of utility model registration request] It has appropriate elasticity, has a pipe support hole of the pipe shutter in the center, and has annular grooves that fit into the shaft holes of the link plate at both ends of the outer periphery, respectively.
In a bush for a short cylindrical pipe shutter with an outer peripheral surface of an outer flange portion of an annular groove having a diameter reduced outward and a tapered surface, the pipe support hole is formed in a polygonal hole in which the pipe is inscribed, 1. A bushing for a pipe shutter, characterized in that the cylindrical wall of the bushing has a wall thickness that continuously changes in the circumferential direction, and thick parts and thin parts are formed alternately over the entire length.