| 摘要 |
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.
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