Patent GB-957665-A (GB)
Title: Electrical connector crimping tools
Inventor: BROSKE WILLIAM FRANKLIN
IPC: H01R43/042
Filed: 1963-03-20
Abstract: 957,665. Jointing by stamping. AMP Inc. March 20, 1963, No. 11006/63. Heading B3Q. [Also in Division F3] A tool for crimping an electrical connector to a conductor comprises a frame carrying a fixed crimping die, a movable crimping die mounted on a ram slidable in the frame for relative movement towards the fixed die, a combustion chamber on the frame in which a propellent explosive charge is arranged to be burnt to drive the movable die to effect crimping of the connector and an electrical heating element energizable through a circuit by closing a switch to fire the charge. The tool comprises a frame 10, a bight 11 having a fixed and a movable die 14. 16 at each respective end thereof and a handle 12. The movable die 16 has an integral ram extension 20 slidable within a thermoplastic explosive cartridge case 22 located in a sleeve 17 screwably attached to the bight. A charge 26 is retained within the case by a thermoplastic plug 24 and a high resistance electrical filament extends therethrough and is connected to a pair of contacts 29 on the plug and the closed end 23. A cap 30 contains an insulating member 33 and conductive plate 34 retained therein by an insulated bush 35 and a socket 32 having an insulator 32<SP>1</SP> and receptacle 39, and is screwed on to the sleeve so that the contact 29<SP>1</SP> abuts the plate 34. With the ram of the movable die in its extreme rearward position and abutting the contact 29 a switch operated battery capacitor source is connected by a two conductor cable " C " to the socket 32. Operation of the switch completes the circuit and heats the filament to fire the charge which drives the die 16 forward to effect crimping. In an embodiment the current source and trigger are housed within the handle and one electrode therefrom is permanently connected to the inner face of the handle whilst the other electrode is coupled to a spring loaded pin 143 retained in an insulated bushing 118 and in contact with a metallic sleeve 122 which surrounds a flanged insulating sleeve 121 fitted to the rain 117 of the movable die and is located within the cartridge case 123. The sleeve 122 also contacts a metal ring 129 of a thermoplastic plug assembly 126 fitted in the case 123, the ring is coupled to a central contact 128 by a filament wire 130. The movable die is held in its starting position with the end of the ram abutting the contact 128 by a resilient detent 132. In both of the above cases the circuit is rendered inoperable if the ram is not in contact with the plug contact. In a further embodiment the workpiece forms part of the electrical circuit. A pair of conductive members insulated except for the portions which engage the conductors are connected to pivotally mounted carriers 164 and to one side of the current source. Engagement of the conductor seated in the connector within the die by the members completes one half of the circuit whilst the other half of the circuit is coupled to the single contact of the cartridge case, the filament and the movable die ram. Specification 872,626 is referred to.