Patent GB-892313-A (GB)
Title: Improvements in or relating to eyeletting machines and die assemblies for use therein
IPC: A43D100/02
Filed: 1957-07-09
Abstract: 892,313. Making electrical components; eyeletting. TUCKER EYELET CO. Ltd., GEORGE, BELL, A. S., HUGHES, W., and NEALE, J. C. July 8, 1958 [July 9, 1957], No. 21665/57. Classes 83 (2) and 83 (4). An eyeletting machine for use in setting eyelets by forming an annular rib in the barrel at one side of a workpiece and leaving an end portion of the barrel projecting beyond the rib, comprises, for operation at said one side of the workpiece, a die assembly providing a pin arranged to be received within the barrel of the eyelet and to provide therein a wall to restrain inward buckling of the eyelet barrel during setting, a bore whose wall surrounding said pin embraces the eyelet barrel projecting beyond the rib after setting and a shoulder arranged within the bore to exert endwise pressure on said projecting portion of the eyelet barrel to form the rib, the assembly being so arranged that after setting the eyelet to form the rib relative movement takes place between said shoulder and at least one of the said walls to facilitate removal of the eyelet. In an embodiment the eyelet E is fed from a hopper (not shown) on to a yieldable pin 15 mounted in the upper die 13. The lower die comprises a pair of semi-frusto-conical members 16 accommodated in a complementary recess 18 in a block 14. Disposed in a vertical bore between the members 16 is an adjustable pin 26 and a spring 32 surrounding the pin supports the members 16. The upper portion of the bore formed by the members 16 is enlarged at 36 to receive the end part of the eyelet barrel which abuts a shoulder 38. A spring-loaded work support table 40 is provided to ensure that the head flange of the eyelet is held against the upper surface of the workpiece W. In operation a terminal board W is placed on the table 40 so that the pin 26 projects up through a hole in which an eyelet E is to be set to act as an electrical terminal. On downward movement of the upper die assembly the pin 15 engages the pin 26 and the pin 15 retracts into the upper die 13 which pushes the eyelet over the pin 26 and against the shoulder 38. Further downward movement depresses the members 16 until the enlarged portion 36 grips the lower part of the eyelet barrel after which continued movement causes the barrel adjacent the underside of the terminal board to splay outwardly to form an annular rib 21. Compressed air is supplied to the recess 18 to remove metal dust accumulating in the enlarged portion of the bore formed by the members 16. In another embodiment the pin 77 has a reduced end portion 79 for receiving an eyelet which abuts a shoulder 81. The pin is spring-loaded in the block 74 and an abutment 83 on the pin determines its uppermost position and an adjustable plug 89 in the block 74 determines its lowermost position. A spring-loaded work support 93 surrounds the upper end portion of the block 74 and its upper position is set by a screw 101. In operation, when the eyelet engages the shoulder 81 on the pin 77 the pin is pushed downwardly until it is arrested by the plug 89. The head flange of the eyelet now engages the workpiece and further downward movement of the upper die assembly causes the work support to descend and an annular rib 21 to be formed on the eyelet adjacent the underside of the workpiece. Specification 663,746 is referred to.