The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 28, 1978
Filed:
Nov. 21, 1975
Takashi Nakazato, Maebashi, JA;
Chikamitsu Sawada, Takasaki, JA;
Shigeyuki Umino, Maebashi, JA;
Mitsuhiro Takatsuru, Takasaki, JA;
Max Co., Ltd., Tokyo, JA;
Abstract
This striking tool of an internal combustion type includes in a housing of a tool body a cylinder providing slidably a piston connecting to a driver. A combustion chamber is disposed around the side wall of the cylinder. A fluid controlled valve is disposed between the combustion chamber disposed around the side wall of the cylinder. A fluid controlled valve is disposed between the combustion chamber and a piston upper chamber of the cylinder, which is normally biased to close communication between the combustion chamber and the piston upper chamber and operated to open communication therebetween when mixture gas of combustible gas and air in the combustion chamber is exploded therein. When a trigger, disposed on the external of the tool body and driveable outwardly, is driven, said mixture gas at first enters and fills up the combustion chamber and then is ignited therein by igniting means. A rising of combustion pressure generated by ignition of mixture gas in the combustion chamber directly opens said valve. The combustion pressure is, thereby, supplied into the piston upper chamber of the cylinder and pressurize a upper surface of the piston to drive the piston lower abruptly. At the same time, the piston gives the driver connected thereto striking force.