Manually operable internal combustion-type impact tool with redu

Details Manually operable internal combustion-type impact tool with redu Manually operable internal combustion-type impact tool with redu

1998-10-28

2000-09-12

Smith, Scott A.

Elongated-member-driving apparatus

Explosive-type driving means

With plunger

227130, 123 46SC, 60632, B25C 104

Patent

active

061164895

ABSTRACT:
A detonating impact tool, such as a nailer, has a manual recycler. The recycler has a pump housing which is moved through a stroke to purge exhaust combustion gases from the tool. The tool provides pump housing which operates with a significantly reduced stroke as compared to previous manual recyclers. The tool has a return spring which automatically returns the piston and its associated driver to a rest position part way along a cylinder and forward of a vent port after each detonation. In one embodiment of the invention a restriction in the cylinder wall temporarily holds the piston at its rest position. The stroke reduction system reduces the length of travel of the pump section for easier and faster tool performance while the more compact design enhances market appeal. The reduced stroke facilitates embodiments of the invention wherein the pump housing is actuated by a squeeze lever.

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patent: 5213247 (1993-05-01), Gschwend et al.
patent: 5687899 (1997-11-01), Dohi et al.

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