JPH0442476Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an improvement of a bushing 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, in the bush shown in FIG. 5, an annular shape 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. forming a groove 6;
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. Axial hole 3 of plate 3
If a 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 and reduced in diameter due to the deformation and contraction of the split groove 7, and the shaft hole 3a is The outer flange 6a is fitted into the annular groove 6, and after fitting, the outer flange 6a is inserted into the annular groove 6.
returns to its original shape by its own elasticity, and the link plate 3 is prevented from falling out.

[Problems to be solved by the invention] Since the above-mentioned improved bushing does not use caulking means, the length of the pipe shutter can be extended or shortened at will on site, but the annular groove 6 has a thin wall. Moreover, since it is divided into several pieces by the groove 7, the strength in the direction supporting the link plate 3 is weak, and the annular groove 6 often breaks due to frequent opening and closing of the shutter, and the link plate There was a problem where 3 was getting out.

The present invention was devised in view of the above-mentioned actual situation and to eliminate the drawbacks of the conventional ones. While it is easy to assemble the shutter and disassemble it when changing the pipe length, it also improves the strength of the link plate support shaft to prevent damage to the support shaft and drop-off of the link plate. It is an object of the present invention to provide a bushing for a pipe shutter that can prevent the above problems.

[Means for Solving the Problems] The technical means adopted by the present invention to solve the above-mentioned problems is a pipe shirt used for connecting parts of link plates that pass through a large number of pipes and connect them in a grid pattern. In the bush for a motor, the bush is formed into a rotatable cylindrical body by fitting an outer bush and an inner bush into each other, and the outer bush has a support shaft for a link plate formed at both ends, and a support shaft for a link plate is formed at one end. A flange to prevent the link plate from falling out is formed on only the support shaft, and the inner bushing is formed in the length between both ends of the outer bushing, and the outer periphery of both ends is , a retaining flange of the outer bushing and a retaining flange of the link plate are formed, and the retaining flange of the link plate formed on the outer bushing and the retaining flange of the outer bushing formed on the inner bushing are on the same side. A tapered surface whose diameter decreases outward is formed on the outer peripheral surface of each flange, and a tapered surface is formed at the end along the generatrix of the cylindrical body located opposite to each other in the radial direction. It is characterized by having two grooves cut into it.

[Operation of the invention] In the above configuration, in order to attach the link plate to the bushing, the flange-less support shaft side of the outer bushing is simply inserted into the shaft hole of the link plate, and the inner bushing is fitted to the outer bushing. At this time, the link plate is prevented from being removed by the link plate removal prevention flange on the inner bushing.
If the shaft hole of the link plate is applied to the support shaft side of the outer bushing with the flange to prevent the link plate from slipping out, and the shaft hole of the link plate is pressed firmly, the diameter of the flange part will be reduced by deforming and shrinking the split groove, and the link plate will close to the flange part. to be inserted into. After fitting, the link plate is prevented from coming off due to the elastic return of the flange portion.

Next, the inner bushing is fitted to the outer bushing by fitting the end of the inner bushing on the side with the bushing retaining flange into the end of the outer bushing without the flange. Similarly, the inner bushing is fitted by reducing its diameter by elastic bending of the bushing retaining flange portion, which has a tapered surface and grooves, and is prevented from coming out by the elastic return of the flange portion after being fitted.

After fitting the outer and inner bushings to the link plate as described above, if the positions of the split grooves on both bushings are mutually displaced, the split groove portion carved on the outer bushing will be replaced by the inner bushing with no split grooves. The support shaft of the outer bushing is reinforced by the peripheral wall portion, and has the same strength as the shaft without the groove, and the strength of the shaft at the other end without the groove is not reduced. Both support shafts of the outer bushing have durability and are prevented from being damaged by shock loads and the like when opening and closing the shutter.

In addition, when removing the link plate and the inner and outer bushings, press the outer periphery of the link plate retaining flange of the outer bushing and the bushing retaining flange of the inner bushing while aligning the grooves of both bushings. The outer diameter of each of the flanges mentioned above can be easily reduced in the direction of diameter reduction, and the link plate and inner bushing can be easily reduced.
They can be easily taken out from the support shaft of the outer bushing and the fitting hole of the inner bushing, respectively.

[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 vertical sectional view showing the assembled state of the bush of the present invention, FIG. 2 is an exploded perspective view of the bush, and FIG. 3 is a partial front view of a pipe shutter using the bush.

In the figure, reference numeral 10 denotes a bush for a pipe shutter according to the present invention, and the bush 10 is composed of an outer bush 11 and an inner bush 21, which are formed into a short cylindrical shape from a synthetic resin material having appropriate elasticity. There is.

The outer bushing 11 has an inner bushing fitting hole 12 with an inner diameter equal to the outer diameter of the body 22 of the inner bushing 21, and is inserted into the shaft hole 3a of the link plate 3 of the pipe shutter 8 formed at the center of the outer circumference. Link plate support shaft portions 14, 14' having an outer diameter equal to the shaft hole 3a of the link plate 3 are formed at both ends of the boss portion 13 having a large diameter and a predetermined width, and the outer end of one support shaft portion 14'. A link plate retaining flange 15 is formed at the end portion, and the link plate retaining flange 15 has a slightly larger diameter than the shaft hole 3a of the link plate 3 and has a tapered surface 15a whose outer peripheral surface decreases in diameter toward the outside. Grooves 16, 16 are cut in the longitudinal direction of the bushing from positions facing each other.

On the other hand, the inner bushing 21 is different from the outer bushing 11.
The body 2 is equal to the inner diameter of the inner bushing fitting hole 12.
A pipe support hole 23 having an outer diameter equal to the outer diameter of the pipe 9 of the pipe shutter 8 and an inner diameter equal to the outer diameter of the pipe 9 of the pipe shutter 8, and a body part 22 having a length between both ends of the outer bushing 11, and one end of the body part 22. A tapered surface 24a having a diameter slightly larger than the outer diameter of the body portion 22 and decreasing in diameter as the outer circumferential surface faces outward.
A bushing retaining flange 24 is formed, and a split groove 25 is carved in the longitudinal direction of the bushing from a radially opposing position at the end thereof, and a shaft hole of the link plate 3 is formed at the other end. A link plate retaining flange 26 having a larger diameter than 3a is formed.

In order to assemble the pipe shutter 8 using the pipe shutter bushing 10 constructed as described above, each shaft hole 3a of one link plate 3, 3a is inserted as is, and the support shaft portion 14' on which the link plate retaining flange 15 is formed,
The other link plates 3, 3 are attached to the link plate retaining flange 15 through the shaft holes 3a, 3a.
If the flange 15 is pressed strongly against the tapered surface 15a of the link plate 3, the flange 15 will bend inward and reduce its diameter since it is divided by the groove 16.
The shaft holes 3a, 3a pass over the flange 15 and fit into the support shaft portion 14'. After fitting, the flange 15 returns to its original shape by its own elasticity, and the link plates 3, 3 are prevented from coming off.

Next, when the bushing retaining flange 24 side of the inner bushing 21 is pushed in from the flange-free fitting hole 12 side of the outer bushing 11, the bushing retaining flange 24 moves inward in the same manner as the link plate retaining flange 15. The inner bushing 21 is bent and reduced in diameter, and the inner bushing 21 is fitted into the fitting hole 12. After fitting, the flange 24 tightens the outer bushing 11 due to its own elasticity.
The link plate returns to its original shape on the side of the retaining flange 15, and both the inner and outer bushes 11, 21 are prevented from coming off, respectively, with the link plates 3, 3 interposed therebetween.

In this way, a predetermined number of link plates 3, 3... are sequentially connected in the length direction by bushes 10, and the pipe support holes 2 of each bush 10, 10...
The pipe shutter 8 is completed by inserting the pipes 9, 9, .

Pipe shutter 8 assembled as described above
When the inner bushing 21 is inserted into the outer bushing 11, the grooves 16 and 2 cut into both bushings are
By displacing the positions of 5 (in the embodiment, perpendicularly), the strength of the support shaft portion 14' on the outer bushing 11 side at the groove 16 portion can be reduced.
It can be reinforced by the peripheral wall of the pipe support hole 23 formed in the inner bushing 21 except for the split groove 25 portion, and together with the support shaft portion 14 at the other end which does not have a split groove, it maintains durability and can withstand frequent shuttering. Damage to the bush 10 due to excessive opening and closing is prevented.

Also, link plate 3 and inner bush 2
1 from the outer bushing 11, align the positions of the grooves 16 and 23 and remove the link plate retaining flange 15 of the outer bushing 11.
By pressing the outer periphery of the bushing retaining flange 24 of the inner bushing 21, the outer diameter of each of the flanges 15, 24 can be easily reduced in the diameter reducing direction, and the link plate 3 and the inner bushing 21 can be It can be easily taken out from the support shaft portions 14, 14' of the outer bushing 11 and the inner bushing fitting hole 12.

Note that the inner bushing 21 is molded from polycarbonate resin with excellent mechanical strength, and the outer bushing 1 is molded from polycarbonate resin with excellent mechanical strength.
By molding 1 with a rubbery elastic material such as elastomer, the bush of the pipe shutter comes into contact with the slat when the shutter is opened and closed, in a joint shutter configured as a pipe shutter at the top and a slat shutter at the bottom. This can prevent scratches on the slats caused by this, and if the outer bushing is made of an acrylic resin that can be colored and has excellent weather resistance, a variety of color effects can be obtained.

[Effects of the invention] In summary, the present invention provides a bushing for a pipe shutter used in the connecting part of a link plate that connects a large number of pipes in a lattice shape. The two are inserted into each other to form a rotatable cylindrical body,
The outer bush has a link plate support shaft formed at both ends, and a link plate retaining flange with a slightly larger diameter than the support shaft is formed at only one end. At the same time, a retaining flange for the outer bushing and a retaining flange for the link plate are formed on the outer periphery of both ends to prevent the link plate formed on the outer bushing from being withdrawn. The retaining flange and the retaining flange of the outer bushing formed on the inner bushing correspond to each other at the end on the same side,
A tapered surface whose diameter decreases toward the outside is formed on the outer circumferential surface of each of these flanges, and two grooves are formed at the end portions along the generatrix of the cylinder, which are located opposite to each other in the radial direction. Because it is engraved, the bush and link plate can be easily inserted and removed without using any special assembly tools, making it easy to assemble the shutter on site and disassemble it when changing the pipe length. Although it is easy to do, it also improves the strength of the support shaft of the link plate and prevents damage to the support shaft and fall of the link plate when opening and closing the shutter. This has very useful practical effects such as 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 longitudinal cross-sectional view of the bush in an assembled state, Fig. 2 is an exploded perspective view of the bush, and Fig. 3 is an exploded perspective view of the bush. is a partial front view of a pipe shutter using the same bushing, FIG. 4 is a front view showing assembly using a conventional bushing for a pipe shutter, and FIG. 5 is a perspective view of another conventional bushing for a pipe shutter. . In the figure, 1, 1'... short cylinder body, 2, 23... pipe support hole, 3... link plate, 3a... shaft hole, 4, 14, 14,'... link plate support shaft, 5... Spacer pin, 6... Annular groove, 6a
...Outer flange, 6b, 15a, 24a... Tapered surface, 7, 16, 25... Division groove, 8... Pipe shutter, 9... Pipe, 10... Bush for pipe shutter, 11... Outside Butsuyu, 12
...Inner bush fitting hole, 13...Boss part, 15
. . . Link plate removal prevention flange, 21 . . . Inner bush, 22 .

Claims (1)

[Scope of utility model registration request] In a bush for a pipe shutter used for connecting parts of link plates that pass through a large number of pipes and connect them in a grid pattern, the bush is formed into a rotatable cylindrical body by inserting an outer bush and an inner bush into each other. The outer bush has a support shaft for the link plate at both ends, and a link plate retaining flange with a slightly larger diameter than the support shaft is formed at only one end. is formed to the length between both ends of the outer bushing, and a retaining flange of the outer bushing and a retaining flange of the link plate are formed on the outer periphery of both ends of the outer bushing. The retaining flange of the plate and the retaining flange of the outer bushing formed on the inner bushing correspond to each other at the same end, and the outer peripheral surface of each of these flanges is formed with a tapered surface that decreases in diameter toward the outside. A bush for a pipe shutter, characterized in that the end portion thereof is provided with two grooves along the generatrix of the cylindrical body located opposite to each other in the radial direction.