Elongated-member-driving apparatus – Explosive-type driving means – With plunger
Reexamination Certificate
2005-05-10
2005-05-10
Rada, Rinaldi I. (Department: 3721)
Elongated-member-driving apparatus
Explosive-type driving means
With plunger
C227S008000, C227S130000
Reexamination Certificate
active
06889885
ABSTRACT:
A combustion-powered nail gun including an arrangement for promoting a piston returning motion to its upper dead center. A combustion chamber frame is movable toward and away from a head cover at which a spark plug is provided. When the combustion chamber frame is in close contact with the head cover, a combustion chamber is provided among the combustion chamber frame, the head cover, a part of a cylinder and a piston. After the piston reaches the lower dead center as a result of combustion, a thermal vacuum is provided in the combustion chamber for allowing the piston to move toward the upper dead center. The combustion chamber frame has a through-hole, and a valve is provided for normally closing the through-hole. A solenoid is provided to selectively open the valve for leaking an increased pressure in the combustion chamber through the through-hole during the return stroke of the piston.
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Hitachi Koki Co,. Ltd.
Rada Rinaldi I.
Truong Tranh
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