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US 3,962,013 AGranted
Method of forming a bearing hole in the body of a strap member mainly adapted for use as a watch strap
AssigneeNCO Works, Ltd.
InventorToru Mashida
Life of this patent
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AssigneeNCO Works, Ltd.
InventorToru Mashida
Estimating the term…
There are provided improvements in the formation of a bearing hole in the body of a strap member made of a thermoplastic resin and particularly adapted for use as a watch strap, said bearing hole being intended to receive therethrough a spring rod or the like for mounting said strap member onto a watch case or the like. Firstly, the improvements are directed to a method of forming a bearing hole in one end of the body of said strap member which comprises having said end of said body contacted by a tubular member having a central axis thereof penetrated by a core member of a material having a small dielectric loss and being of a nature not to be fused with said strap member body even when heated, and then integrally heat uniting together said strap member and tubular member by means of a high frequency adhesion device in a silicone rubber press mold to form a bearing hole at a right position in the body of said strap member. Secondly, the improvements involve a method of forming a bearing hole in a more effective manner by employment of a core member such as rod-like one of which at least the surface portions are composed of a material which is so excellent in lubricity and heat resistance as to be easily released from the press mold, thereby enabling the core rod to be easily removed from the strap body by pulling.
In the manufacture of a strap member comprising a body which includes at least one layer substantially composed of a thermoplastic resin and particularly suitable for use as watch strap, a method of forming a bearing hole in one end of said strap member for attaching said strap member onto a watch case or the like, comprising steps of:
In the manufacture of a strap member comprising a body which includes at least one layer substantially composed of a thermoplastic resin and suitable particularly for use as a watch strap, a method of forming a bearing hole in one end of said strap member for attaching said strap member onto a watch case or the like, comprising steps of:
In the manufacture of a strap member comprising a body substantially composed of a thermoplastic resin, and suitable particularly for use as a watch strap, a method of forming a bearing hole in one end of said strap member for attaching said strap member onto a watch case or the like, comprising steps of:
Dependencies are inferred from the claim text.