Patent ID: 6854631

Claim:
A fastener driving device comprising: a housing having a chamber constructed and arranged to contain compressed air; a cylinder disposed within said housing; a piston disposed within said cylinder and movable between upper and lower positions within said cylinder; a fastener striker connected with said piston; a main valve formed from a resilient material, said main valve having a first portion thereof sealingly engaged with a first portion of said cylinder, said main valve having a second portion thereof movable between a sealing position with a second portion of said cylinder and an unsealed position as a result of flexing of said resilient material, said unsealed position permitting said compressed air to force said piston to move from said upper position to said lower position to enable said fastener striker to move through a fastener driving stroke; and a trigger valve carried by the housing and being actuatable to air pressure in the vicinity of said main valve to enable said second portion of said main valve to move from said sealing position to said unsealed position.