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. 30, 2003
Filed:
May. 06, 2002
Noriaki Kikuchi, Hitachinaka, JP;
Hajime Kikuchi, Hitachinaka, JP;
Masateru Niyada, Hitachinaka, JP;
Hitachi Koki Co., Ltd., Tokyo, JP;
Abstract
A longer life screwdriver is disclosed, and the screwdriver includes a ball retained in a through-hole in a manner movable in a radial direction of a driving shaft member, the through-hole being defined in a driving shaft member, the ball being possible to project beyond the driving shaft member along an outer circumference of the driving shaft member, the ball further being possible to abut an end of a clutch spring, and elements for allowing the ball to protrude beyond the driving shaft member along the outer circumference of the driving shaft member in response to axial movement of the output shaft member against a pressing member, the improvement comprising: disengagement elements for releasing engagement between the clutch spring and the ball during the reverse rotation of a motor.