Combustion-type power tool

Details Combustion-type power tool Combustion-type power tool

2007-03-27

2007-03-27

Cronin, Stephen K. (Department: 3747)

Internal-combustion engines

Adjustable combustion chamber

Piston in head adjusted

C123S0460SC

Reexamination Certificate

active

11274323

ABSTRACT:
A combustion-type power tool includes a cylinder and a combustion chamber disposed on top of the cylinder that accommodates a gaseous mixture of existing air in the combustion chamber and fuel injected therein. A spark plug generates a spark to combust the gaseous mixture in the combustion chamber. A trigger switch produces the spark in the spark plug when operated. A piston is movably supported in the cylinder and driven by combustion in the combustion chamber. A driving blade is integrally formed with the piston for driving a fastener. A push lever is provided at one end of the housing and coupled with the combustion chamber frame. A temperature sensor is provided, for example, on the combustion chamber frame to sense the temperature thereof. A stopper is operated to adjust the position of the push lever to be shifted from an initial position when the sensed temperature is higher than a critical value. The push lever is positioned farther from another end of the housing when adjusted than when the push lever is in the initial position.

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