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:
Dec. 05, 2000
Filed:
May. 20, 1999
Isamu Tanji, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
An air motor is provided in a housing and driven by the compression air introduced from an intake port. An anvil, receiving the rotational force of the air motor, has a rear end accommodated in the housing and a front end protruding out of the housing. A driver bit, engaged with a screw inserted into a board member, is rotatable and shiftable together with the anvil relative to the housing. An intake valve is responsive to a retractile shift movement of the driver bit to open an air passage connecting the intake port to the air motor. The intake valve closes this air passage in response to a protrusile shift movement of the driver bit returning to its original position so as to stop the air motor. An assist means is provided for applying the pressure of the compression air to a rear end surface of the anvil in response to the rotation of the air motor.