Combustion-type power tool with exhaust gas flow regulating rib

Details Combustion-type power tool with exhaust gas flow regulating rib Combustion-type power tool with exhaust gas flow regulating rib

2007-05-01

2007-05-01

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

C123S0460SC, C227S009000, C227S010000

Reexamination Certificate

active

11311250

ABSTRACT:
A combustion-type power tool includes a cylinder and a combustion chamber frame disposed to surround the cylinder and movable along the cylinder. A partition wall divides an inner space of an outer frame into a first space in which the cylinder and the combustion chamber frame are disposed and a second space in which a gas cartridge cylinder is disposed and has a through-hole through which the first space and the second space are in fluid communication with each other. A plurality of ribs is formed on an outer surface of the cylinder for regulating an exhaust gas flow generated by combustion of a gaseous mixture in the combustion chamber. The ribs enable exhaust gas discharged from the combustion chamber to be directed away from the through-hole, thereby enabling the gas cartridge cylinder to be maintained at a substantially constant temperature.

REFERENCES:
patent: 4403722 (1983-09-01), Nikolich
patent: 4522162 (1985-06-01), Nikolich
patent: 5197646 (1993-03-01), Nikolich
patent: 5971245 (1999-10-01), Robinson
patent: 6431429 (2002-08-01), Canlas et al.
patent: 6889885 (2005-05-01), Ohmori
patent: 7063053 (2006-06-01), Hirai et al.

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