Combustion type power tool having avoiding unit for avoiding...

Details Combustion type power tool having avoiding unit for avoiding... Combustion type power tool having avoiding unit for avoiding...

2006-04-04

2006-04-04

Yuen, Henry C. (Department: 3747)

Internal-combustion engines

Free piston

Single chamber; one piston

Reexamination Certificate

active

07021251

ABSTRACT:
A combustion type power tool capable of avoiding damage to seal members and a housing to prolong a service life, and capable of enhancing operability and workability. Temperature elevation of a combustion chamber frame due to combustion of a mixture of combustible gas and air is detected by a temperature sensor disposed in a housing. If the detected temperature exceeds a preset temperature, ignition of an ignition plug is prohibited by a prohibiting unit in spite of ON operation of a trigger switch. In this state, alarming is performed by a display to notify the user of the inoperable state of the tool. Similar control can be made when the temperature sensor is disposed at a cylinder, an exhaust cover and the housing.

REFERENCES:
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patent: 4403722 (1983-09-01), Nikolich
patent: 4483473 (1984-11-01), Wagdy
patent: 4522162 (1985-06-01), Nikolich
patent: RE32452 (1987-07-01), Nikolich
patent: 6123241 (2000-09-01), Walter et al.
patent: 6783045 (2004-08-01), Shima et al.
patent: 0 857 546 (1998-08-01), None

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