Fastener driving gun

In a fastener driving tool having a housing, barrel, fastener driving piston in the barrel, breech block, firing pin, and cartridge magazine in strip form, the improvement comprising:

• a firing pin retracting means for retracting the firing pin from the path of travel of the cartridge strip through the tool,
• said retracting means including a lever pivotally mounted in the housing and located in front of at least a portion of the breech block and the firing pin and operable, when engaged by the breech block, to push the firing pin rearward from a cartridge firing position.

In a fastener driving gun having a housing, a barrel in the front of the housing, a cartridge guide, a breech block in the rear of the housing, and a firing pin, said firing pin and breech block being movable forward and rearward in said housing, the improvement comprising:

• a cocking lever having a pivotal mounting to said housing and having one end portion facing said firing pin and another end portion facing said breech block, said end portions being on opposite sides of the pivotal mounting to said housing,
• said one end portion being engageable with said firing pin, and said another end portion being engageable with said breech block,
• said end portions being so related to said firing pin and said breech block and said pivotal mounting that, when said breech block moves forward in engagement with said cocking lever, said cocking lever moves said firing pin rearward.

The improvement of 10 wherein:

• said housing includes a sear release pin aperture therein;
• said breech block being movable rearward into a position of registry of said sear pin aperture with said sear release pin aperture for arming the gun.