Breathing apparatus with an automatic firing mechanism

Details Breathing apparatus with an automatic firing mechanism Breathing apparatus with an automatic firing mechanism

B - Operations, Transporting

01

J

23/396, 128/71

B01J 7/00 (2006.01) A62B 7/08 (2006.01) A62B 21/00 (2006.01)

Patent

CA 1102529

BREATHING APPARATUS WITH AN AUTOMATIC FIRING MECHANISM Abstract of the Disclosure A candle for producing oxygen when ignited is mounted in the bottom of a chemical canister that is to be inserted in an open-bottom breathing apparatus receptacle provided with a depending projection. A primer for igniting the candle extends through the bottom of the canister and is exposed in the top of a firing mechanism housing secured to the canister bottom. At one side of the primer a hammer has one end pivot- ally connected to the housing on a transverse axis, with a spring urging the free end of the hammer into contact with the primer. Pivotally mounted in the housing on a transverse axis below the hammer is a trigger having one end engaging the bottom of the free end of the hammer in its cocked posi- tion, with the opposite end of the trigger positioned to be engaged by the receptacle projection when the canister is moved up into the receptacle, whereby to turn the trigger to disengage it from the hammer in order to release the hammer.

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