JPH0523057Y2 - - Google Patents

Description

[Detailed explanation of the idea] "Technical field" The present invention relates to a shoulder rest for a strap.

``Prior art and its problems'' Strap shoulder rests have traditionally been made of cloth, rubber, etc. However, cloth made of cloth lacks anti-slip effect and cushioning properties, and the threads become frayed after long-term use.
Easy to cause problems such as color fading. It is also known that a different material is sewn into the lining to increase the anti-slip effect, but this increases the cost. In addition, the strap stopper is sewn onto this cloth shoulder rest.
Alternatively, it is fixed by insert molding, but this method has poor workability and lacks workability.

On the other hand, rubber straps have a good anti-slip effect and cushioning properties, but because they are not fixed to the strap and are simply inserted through the strap, the position of the shoulder rest can easily shift, the number of parts increases, and installation time is troublesome. It cost.

``Purpose of the invention'' Based on the above-mentioned awareness of the problems with the shoulder rests of conventional straps, this invention improves the anti-slip effect, cushioning properties, prevention of positional deviation, workability, ease of assembly by reducing the number of parts, and ease of installation. The purpose of the present invention is to obtain a shoulder rest for a strap that has a well-balanced improvement, etc.

``Summary of the invention'' The present invention focuses on the elasticity of soft materials such as elastomers and rubber materials, and if a strap stopper made of a hard material is integrally molded directly on both ends of the elastomer, the elasticity of the elastomer or rubber material can be improved. It was designed with the focus on the fact that it provides an anti-slip effect and cushioning properties, and since the strap stoppers at both ends are made of a hard material, the strap can be securely locked to these, and no misalignment will occur. It is something.

That is, the strap shoulder rest of the present invention is characterized in that strap stops made of a hard material are integrally molded on both ends of the shoulder rest main body made of a soft elastic material.

Preferably, the shoulder rest body is constructed from an elastomer or rubber material, and the strap stopper is constructed from a hard synthetic resin material or a metal material. In particular, when the strap stops are made of a hard synthetic resin material, after the pair of left and right strap stops are injection molded, a part of the strap stops is embedded inside and the shoulder rest body is further injection molded (double injection molding). ) and has good processability. Furthermore, the shoulder rest main body may be formed by insert molding on the outside of the strap stopper made of metal or hard synthetic resin material, and the workability is similarly good.

``Embodiments of the invention'' The invention will be described below with reference to illustrated embodiments. 1st
Figures 1 through 3 show an embodiment of a strap shoulder rest 10 according to the present invention. This shoulder rest 1
0 consists of a shoulder rest main body 11 in the center and left and right strap stops 12, 12. The shoulder rest main body 11 is made of elastomer and has elasticity suitable for a shoulder rest. For example, polyester elastomer, nylon elastomer,
Those with a JIS hardness of around 50 (for example, "Belprene" (product name) manufactured by Toray Industries, Inc., "Grillax" manufactured by DIC Corporation)
(same)), appropriate elasticity can be obtained.

The strap stopper 12 is made of a hard resin such as polyacetal resin, polycarbonate resin, or nylon resin, which has excellent bondability with these elastomers and has mechanical strength that will not easily break when the strap is connected. This strap stopper 12 is provided with a protrusion 13a and a hole 13b in the embedded part 13 on the side of the shoulder rest main body 11, and a strap locking hole 15 provided in the exposed part 14 is provided with a strap 20 that can be folded back. Locking posts 15a and 15b are provided for locking. These locking posts 15a and 15b are provided at positions where an appropriate frictional locking force is generated between them and the strap 20 when the strap 20 is folded back and attached as shown in FIG. is done.

The shoulder rest 10 described above can be easily formed by double injection molding. Fourth
As shown in Figure A, first the upper mold 1A is divided into three parts,
By 1B, 1C and lower molds 2A, 2B, 2C,
The strap stop 12 is injection molded. The central upper mold 1B and lower mold 2B correspond to the embedded portion 13 of the strap stopper 12. Next, while leaving the left and right upper molds 1A and 1C and the lower molds 2A and 2C, as shown in FIG.
In place of B' and the lower mold 2B', the shoulder rest main body 11 is injection molded using this mold. Then, the left and right strap stops 12 are connected by the shoulder rest main body 11, and the left and right strap stops 12 are connected by the shoulder rest main body 11.
Embedded portions 13 are embedded in both ends of the shoulder rest main body 11. The protrusion 13a and the hole 13b increase the bonding strength between the shoulder rest main body 11 and the strap stopper 12.

The above-mentioned shoulder rest 10 is constructed by inserting one end of the strap 20 into the strap locking hole 15 of the left and right strap stoppers 12, respectively, and attaching the locking post 15a.
15b, and the other end is locked to a carried item.

The shoulder rest of the present invention can also be formed by insert molding. That is, the upper mold 1 in Fig. 4B
An upper mold in which A, 1B' and 1C are integrated, and a lower mold in which lower molds 2A, 2B' and 2C are integrated are prepared, and a pre-molded hard synthetic resin material or Metal strap stopper 1
Set 2. Thereafter, the shoulder rest main body 11 made of an elastomer or rubber material can be insert-molded between the embedded portions 13 of the left and right strap stops 12.

``Effect of the invention'' As mentioned above, the shoulder rest of the strap of this invention is
The central part is made of a soft material such as elastomer or synthetic rubber, and strap stops made of a hard material such as hard synthetic resin or metal are integrated at both ends, so the elasticity of the soft material provides anti-slip properties. and cushioning properties. This cushioning helps give a soft feel, especially when holding the main shoulder rest and hanging your belongings. In addition, since the strap is directly locked to the strap stoppers at both ends, there is no risk of the strap and shoulder rest slipping off, the number of parts is reduced, and assembly is simplified. Furthermore, it can be molded using double injection molding, so it has excellent workability.

[Brief explanation of the drawing]

Figures 1 to 4 show an embodiment of the strap shoulder rest according to the present invention, in which Figure 1 is a plan view, Figure 2 is a sectional view taken along the - line in Figure 1, and Figure 3 is a front view. It is a diagram. FIGS. 4A and 4B are cross-sectional views showing the process of forming the shoulder rest of the strap according to the present invention by double injection. 10... Shoulder rest, 11... Shoulder rest body, 12...
... Strap stopper, 13 ... Embedded part, 13
a... Protrusion, 13b... Hole, 14... Exposed part, 1
5... Strap locking hole, 15a, 15b... Locking post, 20... Strap.

Claims (1)

[Claims for Utility Model Registration] (1) At both ends of the shoulder rest body made of soft elastic material,
A strap shoulder rest characterized by an integrally molded strap stopper made of a hard material. (2) The shoulder rest main body is made of an elastomer or rubber material, the strap stoppers are made of a hard synthetic resin material or a metal material, and the strap stoppers are embedded in both ends of the shoulder rest main body.Claim 1
Shoulder rest with straps as described. (3) The strap according to claim 2, wherein the pair of left and right strap stops are injection molded from a hard synthetic resin material, and then the shoulder rest body is further injection molded by embedding a part of the left and right strap stops therein. shoulder rest. (4) The shoulder rest for a strap according to claim 2, wherein the shoulder rest main body is insert-molded by embedding a portion of the pair of left and right strap stoppers therein.