Adjustable threshold firing apparatus for emergency breathing de

Details Adjustable threshold firing apparatus for emergency breathing de Adjustable threshold firing apparatus for emergency breathing de

1992-08-24

1993-12-28

Shaver, Kevin P.

Dispensing

Gas or vapor dispensing

With cutter or punch

B67D 500

Patent

active

052731855

ABSTRACT:
A firing apparatus includes a firing pin on a longitudinal axis and biasing means to urge the pin in a firing direction. A central trigger body with a pull end and base end extends along the axis and includes a fruste-conical surface surrounding the axis and expanding toward the base end to a base edge. An outer trigger body includes a base portion having a sheath with an inner cylindrical surface surrounding the inner body and extending to a base edge. Cooperating screw threads on the inner and outer bodies allow adjustment of the bodies longitudinally, one relative to the other, such that the inner and outer base edges are separated by a selected longitudinal distance. A sear for restraining the firing pin has a head with a face abutting the fruste-conical surface and a back surface opposing the cylindrical surface such that, only when a sufficient longitudinal pulling force is exerted upon the trigger body, the sear head is squeezed between the base edges to release the trigger body from the sear, displacing the head away from the axis and thereby freeing the firing pin to move in the firing direction.

REFERENCES:
patent: 4356936 (1982-11-01), Legris
patent: 4475664 (1984-10-01), Mackal
patent: 4482081 (1984-11-01), Meggs
patent: 4500014 (1985-02-01), Zimmerly
patent: 4946067 (1990-08-01), Kelsall
patent: 5027977 (1991-07-01), Kay et al.

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