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US 3,971,320 AGranted
Electric initiator
AssigneeICI United States Inc.
InventorJohn T. M. Lee
Life of this patent
Estimating the term…
Abstract
An electric initiator, such as a detonator, primer or squib, has a plastic case, a metallic inner cup, an explosive charge and a coaxial plug assembly which includes a conductive pin, a conductive sleeve surrounding the pin and spaced therefrom, an insulator which is bonded to both the pin and the sleeve, and a bridge wire connecting the two electrodes. The initiator also includes two lead wires, one welded or soldered to each electrode. This initiator is easy to assemble automatically and is highly resistant to accidental firing by static electricity.
Claims5
An electric initiator comprising:
- a. a cup-shaped nonconductive cylindrical outer case open at one end and closed at the other end;
- b. a cylindrical metallic inner cup open at one end and closed at the other end, said cup being of one piece construction comprising a cylindrical wall and an end wall at one end, the thickness of the end wall being at least as great as the thickness of the cylindrical wall, the open ends of said nonconductive case and said inner cup being oriented in the same direction, said outer case completely surrounding the side and closed end of said inner cup so as to prevent accidental grounding of said inner cup;
- c. an explosive charge within said inner cup;
- d. a coaxial plug assembly within said inner cup adjacent to said explosive charge, said assembly comprising
- 1. an elongated, longitudinally extending conductive center pin;
- 2.
3 more elements
Dependencies are inferred from the claim text.