Patent ID: 6095392
Filing Date: 2000-08-01
Classification: B25C

Abstract:
A safety apparatus incorporated with a pneumatically operated tool for fastening articles with fasteners, said safety apparatus and tool comprising:a main body, said main body having a pneumatic main chamber formed therein, said pneumatic main chamber having a gas fitting for entry of compressed gas into said main chamber;a main valve housing positioned adjacent to said main chamber, said valve housing including a valve chamber and a means for transfer of compressed gas from a lower end of said valve housing;a metering channel between said main chamber and said valve chamber of said main valve housing, said channel provides pneumatic communication between said main chamber and said valve chamber;a cylinder positioned below said valve housing, said cylinder in pneumatic communication with said valve chamber at an upper first end of said cylinder, said cylinder axially aligned with said main valve housing, said cylinder having a discharge opening in a second lower end of said cylinder;a main valve within said valve housing and oriented above said upper first end of said cylinder;a piston within said cylinder, said piston reciprocatable in an up and down motion within said cylinder;a driver blade assembly positioned below said piston, said driver blade assembly extends down said cylinder when said piston moves down said cylinder;a fastener discharged from said second lower end of said cylinder when said driver blade assembly drives said fastener from said discharge opening in said cylinder;a handle above said main body, said handle having a pneumatic handle passageway formed therein, said passageway in pneumatic communication with said valve housing; anda safety valve in said handle, said safety valve connected to a safety trigger on said handle, said safety valve in pneumatic communication with said passageway, said safety trigger releases gas from said passageway when said safety trigger is actuated;whereby said metering hole maintains said valve housing in constant pneumatic communication with said main chamber; andwhereby said safety trigger is manipulated, and said safety valve is actuated at least once before discharge of said fastener for initiation of a sequential discharge of said fastener from said pneumatic tool.