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:
Oct. 23, 2001
Filed:
Feb. 06, 1997
Makita Corporation, Anjo, JP;
Abstract
A lock washer (,) presses balls (,) and pins (,) against a clutch cam (,) with protrusions (,) formed on its front face. A rear end (,) of a spring holder (,) abuts on the inner edge of the front face of the lock washer (,) while the half of the front end surface of each pin (,) abuts on the rear face of the outer edge of the lock washer (,). Furthermore, the compression spring (,) also abuts on the lock washer (,) with its outer edge approximately aligned with the outer edge of the lock washer (,). Therefore, if a large load is instantaneously applied to a spindle (,) at the end of screw tightening, the outer edge of the lock washer (,) deforms forward. This in turn causes the balls (,) to ride over the protrusions (,) of the clutch face, thus allowing a slight rotation of the internal gear (,). This clutch operation lessens the impact that occurs at the end of screw tightening, serving to protect the tool mechanism and to reduce the shock to the operator's hand.