초록 ▼

A portable gas-fired fastener driving tool in which the tool cannot be operated until the combustion chamber is closed and the combustion chamber cannot be reopened after ignition until the trigger is released. The operation of the trigger is permitted by the actuation of a bottom trip mechanism whi

A portable gas-fired fastener driving tool in which the tool cannot be operated until the combustion chamber is closed and the combustion chamber cannot be reopened after ignition until the trigger is released. The operation of the trigger is permitted by the actuation of a bottom trip mechanism which controls the movement of a sleeve mechanism that regulates the opening and closing of the combustion chamber. During the driving action, the combustion gases above the piston are evacuated through valved openings in the cylinder adjacent the bottom thereof. The piston contacts a bumper at the bottom of its travel and the difference between the vacuum in the combustion chamber and atmospheric air acts to return the piston to its driving position.

대표청구항 ▼

A portable fastener driving tool comprising a housing, a main cylinder in said housing, a piston in said main cylinder and movable from a driving to a driven position, a driver attached to said piston, a magazine for supplying fasteners into position to be driven by said driver, a combustion chamber

A portable fastener driving tool comprising a housing, a main cylinder in said housing, a piston in said main cylinder and movable from a driving to a driven position, a driver attached to said piston, a magazine for supplying fasteners into position to be driven by said driver, a combustion chamber within said housing having a wall portion defining a plurality of openings and said piston as a wall portion thereof, a fan in said combustion chamber and controls therefor to operate same to cause turbulence in said chamber, means for controlling the flow of gases into and out of said combustion chamber, a work sensitive probe assembly cooperating with said means for controlling the flow of gases whereby the combustion chamber is not closed off until the tool is in position to drive a fastener into a work-piece, means for providing fuel into said combustion chamber and igniting same for driving said piston to drive a fastener and trigger operated means responsive to movement of said means for controlling the flow of gases into and out of said combustion chamber whereby the tool cannot be fired until the combustion chamber is closed and the chamber cannot be opened until the trigger is released, and the improvement wherein the wall portion of the combustion chamber is fixed relative to the housing and said means for controlling the flow of gases includes a slidable member disposed adjacent said openings, movable relative to said combustion chamber, and secured to said probe assembly.