GB593852A - Method of producing buckles - Google Patents

Abstract

593,852. Buckles. PLASCO, Ltd. (Crown Fastener Corporation). June 15, 1945, No. 15239. [Class 43] [Also in Groups V and XXII] A method of forming a buckle comprises diecasting a hasp having, at one end a ring-like socket and then die-casting a body member with a cylindrical bearing portion formed within and completely encircled by the socket, with freedom for turning movement in the socket. A two-part die with passages as shown in Fig. 1 is used. Molten metal is injected from a nozzle 12 into a gate 11 which feeds a cavity of the shape of the body portion 10 of the buckle and also another cavity shaped to form the hasp 9, the ring 15 of the hasp being formed around a core-bar 14.. The dies are then opened and the casting, with core-bar is moved down so that the .body portion 10 is below the die and the hasp 9 is held partially within a cavity 13 so that its ring 15 surrounds part of the cavity used for casting the body portion 10. The core-bar is withdrawn to its former position, the dies are completely closed and another casting is made, the straight portion of the body portion 10 being cast within the ring 15 of the previously cast hasp 9. The gate portions are later trimmed off to leave the completed buckles. Instead of metal a plastic may be injected into the dies. A bushing 16 may be placed over the core-bar to form an insert in the ring portion 15 of the hasp. If the buckle is of metal, the bush is preferably of a harder metal or of a fibrous material but may be of metal, fibre or another plastic if a plastic material is used for the buckle. The shrinkage of the body portion 10 on cooling will afford sufficient clearance for a' free movement of the hasp. Lateral movement of the hasp is prevented by integral cast heads 18.