Hand-held pneumatic caulking gun
OwnerGeorge B. Davis, Jr.inventor
Life of this patent
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Abstract
A hand-held pneumatic caulking gun wherein self-contained pneumatic pressure is continuously applied to the caulk driving piston of the gun while the piston is held against movement by this pressure until manually released by a piston movement controlling trigger. The gun further includes a breaking system whereby the rate of movement of the piston, after its release by the trigger, may be selectively regulated. The gun provides that the pneumatic pressure operative to drive the piston forward and toward its caulk driving position may be redirected as required to return the piston to its retracted or initial position. Additionally is included apparatus for manually driving the piston backwards against its driving pressure as required to release piston pressure upon the caulking being dispensed.
Claims30
A hand-held pneumatic caulking gun including in combination, a receptacle for receiving therein a caulk containing cartridge having a caulk dispensing nozzle thereon, a piston movable when driven from a retracted position to a forward position within said cartridge to force caulking from said nozzle, driving means for said piston including means for applying a continuous pneumatic pressure to a surface of said piston to cause movement of the piston through said cartridge to force caulking from said nozzle, manually releasable holding means for holding said piston against movement by said pneumatic pressure towards its forward position, piston release means manually operable to release the holding means from holding the piston, and valving means operable to redirect piston driving pneumatic pressure to return said piston to a retracted position.
A hand-held pneumatic caulking gun including in combination, a receptacle for receiving therein a caulk containing cartridge having a caulk dispensing nozzle thereon, a piston movable when driven from a retracted position to a forward position within said cartridge to force the caulking therein from said nozzle, compartment means for containing a gaseous fluid under pressure and including means operable during a caulk dispensing operation, to apply a continuous gaseous pressure to a surface of said piston thereby tending to drive said piston from a retracted position to a forward position within said cartridge as caulk is forced from said nozzle, piston holding means movable to hold said piston against movement by said gaseous pressure, piston release means manually operable to release said piston from said holding means, and manually controlled valving means operable to redirect said fluid pressure from said compartment means to return said piston from a forwardly driven to a retracted position.
A hand-held pneumatic caulking gun including in combination, a receptacle for receiving therein a caulk containing cartridge having a caulk dispensing nozzle thereon, a piston movable from a retracted position to a forward position within said cartridge to force caulking therein from said nozzle, means forming a compartment in said gun for containing a gaseous fluid under pressure and operable, during a caulk dispensing operation to continuously apply a pressurized gas to a surface of said piston for driving said piston toward a forward position, piston holding means movable to hold said piston against said gaseous pressure, manually movable release means for releasing said piston from said holding means and including means for regulating the rate of piston movement after release from said holding means, and manually operable valving means movable to redirect pressurized gas from said compartment means as required to return said piston from a driven to a retracted position.
Dependencies are inferred from the claim text.