Claims
- 1. A method of making a binding element of a resilient plastic material having a circular configuration of a C-ring with a radial slit forming a pair of ends which are closely adjacent each other, said plastic material having a characteristic of shrinking during cooling from a molding temperature, said method comprising providing a mold having a cavity configuration of the element in a spread condition with the adjacent ends spaced apart a distance greater than said slit, molding the element by inserting a plastic material into the mold cavity at a temperature above the melting point of the plastic material, removing the molded element from the mold, and cooling the element to shrink the adjacent ends of the element substantially together.
- 2. A method according to claim 1, wherein said plastic material is a high molecular weight polyamide.
- 3. A method according to claim 1, wherein the plastic material is a rigid polyvinyl chloride.
- 4. A method according to claim 1, wherein the plastic material is an acetal resin.
Parent Case Info
This is a division of application Ser. No. 169,981 filed Aug. 9, 1971 and now abandoned.
US Referenced Citations (5)
Divisions (1)
|
Number |
Date |
Country |
Parent |
169981 |
Aug 1971 |
|