JPH0410132Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is used to cover metal rods inside vehicles such as buses, so that even if people or their belongings hit the metal rods, they will not cause danger or damage. This relates to a covering that is easy for people to grab.

(Prior art) Conventionally, metal pipes and metal rods inside buses, trains, etc. are wrapped in a sponge material and wrapped with tape, etc., so that there is no danger even if passengers come into contact with them. Safety measures were in place.

Although there is no problem in terms of safety with conventional products like this, since the sponge body is wrapped with tape, the tape tightens and presses the sponge body, making it difficult to obtain sufficient elasticity, making it difficult to install. The work is complicated,
Further, the tape has disadvantages such as easy aging. Therefore, as shown in Figure 3 A and B, a cylindrical body 1 made of soft material such as rubber or synthetic resin is used.
In the peripheral wall of the cylindrical body 1, the outer wall 2,
A cylindrical body surrounded by an inner wall 3 and a partition wall 4 located between the inner wall 3 and a partition wall 4 located between the inner wall 3 and a cylindrical body having a plurality of radial holes 5 extending in the longitudinal direction have been devised to cover a metal rod-shaped object. and has been put into practical use. Further, Japanese Utility Model Application Publication No. 51-143935 describes a protective cushioning material for supports such as buses, which is formed by integrally molding a plurality of small cylinders each having a hollow portion on the inner surface of an outer wall.

(Problem to be solved by the invention) However, in the case of the covering shown in Fig. 3, in order to insert the covering into the metal rod, there is a gap between the outer diameter of the metal rod and the inner diameter of the covering. Therefore, the adhesion between the metal rod-shaped object and the covering is poor, so conventional products with a large clearance require filling the gap with adhesive to maintain adhesion. There is. Moreover, as the clearance increases, the amount of adhesive used also increases, resulting in an increase in cost. In addition, since the protective cushioning material described in Japanese Utility Model Application No. 51-143935 is attached with a plurality of small cylinders in contact with the support column, when a force is applied from the tangential direction,
Since the small cylinder slides on the support while being deformed, it is easily twisted and the twist becomes large, making it extremely dangerous for passengers.

The present invention solves the drawbacks of such conventional coverings.

(Means for Solving the Problems) That is, the present invention is a cylindrical body made of a soft material such as rubber or synthetic resin, and the cylindrical body has an outer wall, an inner wall, and both walls in its peripheral wall. A large number of radial holes extending in the longitudinal direction of the cylindrical body surrounded by partition walls located between are provided, and the inner wall has a plurality of radial holes extending in the longitudinal direction of the cylindrical body. A split groove having a depth that facilitates expansion of the inner diameter is provided, and small protrusions are provided on the inner wall along each part adjacent to the split groove, and a plurality of small protrusions are provided between each split groove. By positioning the radial holes, it is easy to expand the inner diameter of the cylindrical body.
This solves the drawbacks of conventional coverings by reducing the resistance of the covering to the metal bar.

In the present invention, the grooves provided in the inner wall of the cylindrical body are provided to an appropriate depth from the inner wall of the cylindrical body toward the outer wall to the extent that the inner diameter of the cylindrical body can be easily widened.

In this invention, natural rubber and synthetic rubber are used as the rubber constituting the covering, and vinyl chloride resin etc. are used as the synthetic resin, but the Shore hardness is 60°~
70° (ASTM2240A) soft material is particularly preferred.

In the covering of the present invention, the radial holes extending in the longitudinal direction of the cylindrical body surrounded by the outer wall, inner wall, and partition wall have an appropriate cross-sectional shape such as trapezoidal or triangular. be able to. Furthermore, small protrusions are provided on the inner wall of the cylindrical body at a portion adjacent to the grooves to give the inner wall resistance to twisting.

Furthermore, the surface of the cylindrical body can be provided with uneven stripes so that the covering body can be easily gripped in use.

(Function) In the covering body of the present invention, the grooves provided on the inner wall of the cylindrical body facilitate the expansion of the inner wall of the cylindrical body when the covering body is attached to a metal rod-shaped object, and reduce mounting resistance. acts to reduce

Furthermore, when a torsional force is applied to the outer circumferential wall of the covering after being attached to a metal bar, the split grooves follow the movement of the outer circumferential wall and prevent the inner circumferential wall from moving until a certain limit point. When the torsional force is removed within the limit point, the covering body is restored to its normal state, that is, it has a restoring action against the torsion of the covering.

(Example) The present invention will be explained below with reference to Examples.

Fig. 1 shows one embodiment of the covering of the present invention, Fig. 1 A is a perspective view of the covering, Fig. 1 B is a front view of the covering, and Fig. 1 C is a line taken along line A-A in Fig. 1 B. FIG.

In Fig. 1, 1 is the main body of the covering, which is made of elastic vinyl chloride resin, 2 is the outer wall of the covering, 3 is the inner wall of the covering, and 4 is the space between the outer wall 2 and the inner wall 3. The partition wall located at Grooves 7 indicate small protrusions provided on the inner wall.

The sheathing shown in FIG. 1 has a plurality of grooves 6 extending in the longitudinal direction on the inner circumferential wall, so that the inner diameter of the sheathing can be prevented from expanding when the sheathing is attached to a metal rod. This makes it easy to install, and the installation resistance is greatly reduced. Particularly in a test for fitting into an L-shaped pipe using liquid water, it was extremely difficult to fit the conventional covering shown in Fig. 3, whereas the split groove 6
The sheathing of FIG. 1 having a .

Furthermore, when a torsional force is applied to this covering, the outer and inner walls do not move as one because of the split grooves 6 on the inner wall, and until a certain limit point (approximately 30 degrees in rotation angle), the inner wall When the torsional force was removed within its limits without moving, the material's elasticity restored it to its normal state. This shows that the grooves 6 provide the covering with resilience against twisting.

In addition, in the covering shown in FIG. 1, skeletons 4'' arranged in the shape of a triangular ridgeline are provided as partition walls.
The skeletons 4'' arranged in the shape of triangular ridges have excellent bending strength and also have excellent restoring force, and by utilizing this, the covering body can be used after the covering body is crushed by an external force. The aim is to improve the resilience when external force is removed, that is, the rebound resilience.

In addition, in the sheathing shown in Figure 1, the repulsive elasticity of the sheathing is improved by the ribs arranged in the shape of triangular ridges.
The entire structure of the sheath can be made thinner, for example, compared to the conventional sheath shown in FIG.
We were able to reduce material usage by 7.5%.

In Fig. 1, 7 is a triangular protrusion with a protruding height of about 0.5 mm and a maximum width of 1.0 mm, and when this small protrusion applies a torsional force to the covering, the outer peripheral wall begins to move. When this happens, the small protrusions cling to the metal rod-shaped object, exhibiting strong resistance to movement of the inner circumferential wall.

FIGS. 2A and 2B are cross-sectional views of a covering according to another embodiment of the present invention. In the covering shown in FIG. 2A, the radial holes 5 extending in the longitudinal direction of the cylindrical body surrounded by the outer wall 2, inner wall 3 and partition wall 4 have a trapezoidal cross-sectional shape. Furthermore, in the cover shown in FIG. 2B, the depth of the grooves 6 is shallower than that in the cover shown in FIG.

(Effect of the invention) In the covering body of the present invention, grooves are provided by providing grooves on the inner wall of the cylindrical body, and a plurality of holes are located between each groove. As a result, the following effects (a) to (e) are achieved.

(a) When attaching the covering to a metal rod-shaped object, the inner diameter of the cylindrical object can easily expand, and the installation resistance can be greatly reduced. For this reason, conventional products required a large clearance between the outer diameter of the metal bar and the inner diameter of the sheath, but the present invention is extremely easy to install even with the same diameter or a very small clearance.

(b) As mentioned above, in the present invention, the clearance can be kept to a minimum, so the adhesion between the metal bar and the covering is improved.

(c) Conventional products with large clearances maintain adhesion by filling the gap with adhesive, and if the gap is large, the amount of adhesive used increases, resulting in high costs. In contrast, with the present invention, the clearance can be kept to a minimum, and even if adhesive is used, only a small amount is required, reducing costs.

(d) When a torsional force is applied to the sheath after it is attached to a metal rod-shaped object, in the conventional product, the force applied to the outer peripheral wall is directly transmitted to the inner peripheral wall, and the inner peripheral wall moves by the same amount as the outer peripheral wall. , it does not return to its previous normal state even after the torsional force is removed. In order to return to the normal state, it is necessary to twist in the opposite direction again, but if there are grooves on the inner peripheral wall, the movement of the outer peripheral wall and the inner peripheral wall will not necessarily be in unison, and there will be a certain limit. The inner peripheral wall does not move up to the point. Therefore, if the torsional force is removed within the limit point, the elastic force of the material will restore it to its normal state.

(e) Although the covering is required to be soft and highly elastic due to its intended use, the material itself is still highly hard.
Even with the structure of conventional products, it is undeniable that it has a hard feel, but if there are grooves on the inner peripheral wall, the grooves can easily open and close in response to external forces, improving the overall soft feel (soft shoes). (Improved flexural properties).

In addition, by providing ribs arranged in the shape of triangular ridge lines as partition walls (f), the ribs have excellent bending strength and also have excellent restoring force, so that the covering body is not crushed by external force. The restoring property, that is, the repulsion elastic force when it is later removed is improved. In addition, (g) the rebound elasticity is greatly improved, so the overall structure can be made thinner, and the amount of material used is reduced compared to conventional products.

In addition, by providing small protrusions on the inner wall, (h) when an external torsional force is applied and the outer circumferential wall begins to move, the small protrusions cling to the metal rod-shaped object, providing strong resistance to movement of the inner circumferential wall. The difference in effectiveness is extremely large depending on the presence or absence of small protrusions.

[Brief explanation of the drawing]

Figure 1A is a perspective view of an embodiment of the covering of the present invention, Figure 1B is a front view, Figure 1C is a sectional view taken along line A-A' in Figure 1B, and Figures 2A and 2B are the covering of the present invention. FIG. 3A is a perspective view of a conventional covering, and FIG. 3B is a sectional view of another embodiment of the body. In the figure, 1... cylindrical body, 2... outer wall, 3... inner wall, 4... partition wall, 5... radial holes, 6... split groove, 7... small protrusion.

Claims (1)

[Claims for Utility Model Registration] (1) A cylindrical body made of a soft material such as rubber or synthetic resin, which has in its peripheral wall:
A large number of radial holes extending in the longitudinal direction of the cylindrical body surrounded by the outer wall, the inner wall and a partition wall located between them are provided in the inner wall, and the inner wall is provided with a number of radial holes extending in the longitudinal direction of the cylindrical body. A plurality of extending grooves are provided with a depth that makes it easy to expand the inner diameter thereof, and small protrusions are provided on the inner wall along each part adjacent to the grooves,
Moreover, a covering for a metal rod-shaped object for use in a vehicle such as a bus, characterized in that a plurality of radial holes are located between each groove. (2) A covering for a metal rod-shaped object inside a vehicle such as a bus as set forth in claim 1 of the utility model registration claim, which is characterized by including a partition wall arranged in the shape of a triangular ridgeline.