초록 ▼

A pneumatically operated fastener drive device that comprises a housing assembly including a nose assembly defining a fastener drive track. A cylinder is disposed in the housing assembly, and a resilient bumper is disposed towards a bottom of the cylinder. A drive piston is slidably and sealingly mo

A pneumatically operated fastener drive device that comprises a housing assembly including a nose assembly defining a fastener drive track. A cylinder is disposed in the housing assembly, and a resilient bumper is disposed towards a bottom of the cylinder. A drive piston is slidably and sealingly mounted in the cylinder for movement through an operative cycle. The drive piston engages the bumper at the end of the drive stroke. A fastener driving element is operatively connected to the piston for movement therewith and extends through an opening in the bumper. A valve arrangement is movable between a closed position and an opened position to effect movement of the piston and fastener driving element. An actuator and trigger member are operable to control the valve arrangement. The bumper has a sealing portion surrounding the opening in the bumper and disposed outwardly from the cylinder. The sealing portion has exterior surfaces disposed in engagement with adjacent surrounding surfaces of the nose assembly. The sealing portion is flexible outwardly under the force of air pressure within the cylinder below the piston during the return stroke of the piston so that the exterior surfaces of the sealing portion are biased in sealing relation with adjacent surrounding surfaces of the nose assembly.

대표청구항 ▼

[ What is claimed is:] [1.] A pneumatically operated fastener drive device comprising:a housing assembly including a nose assembly defining a fastener drive track;a cylinder disposed in said housing assembly;a resilient bumper disposed towards a bottom of said cylinder;a drive piston slidably and se

[ What is claimed is:] [1.] A pneumatically operated fastener drive device comprising:a housing assembly including a nose assembly defining a fastener drive track;a cylinder disposed in said housing assembly;a resilient bumper disposed towards a bottom of said cylinder;a drive piston slidably and sealingly mounted in said cylinder for movement through an operative cycle including a drive stroke and a return stroke, said drive piston engaging said bumper at the end of said drive stroke;a fastener driving element operatively connected to said piston, said fastener driving element extending through an opening in said bumper and movable in said fastener drive track through a drive stroke in response to the drive stroke of the piston and a return stroke in response to the return stroke of the piston;a valve arrangement including a normally closed main valve which is movable from its closed position to an opened position to allow a supply of air pressure to communicate with an area within the cylinder above the piston to initiate and effect movement of the piston and fastener driving element through the fastener drive strokes thereof;an actuator and trigger member operable to control said valve arrangement;said bumper having a sealing portion surrounding said opening in the bumper and disposed outwardly from said cylinder, said sealing portion having exterior surfaces disposed in engagement with adjacent surrounding surfaces of said nose assembly, said sealing portion being flexible outwardly under the force of air pressure within said cylinder below said piston during the return stroke of said piston so that said exterior surfaces of said sealing portion are biased in sealing relation with said adjacent surrounding surfaces of said nose assembly.