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. 29, 1996
Filed:
Dec. 21, 1994
Mats C Holmin, Stockholm, SE;
Atlas Copco Tools AB, Nacka, SE;
Abstract
A torque responsive release clutch mechanism for a pneumatic power nutrunner having a housing (16) with an air inlet passage (11) and an air motor (12). The clutch mechanism includes a driving clutch half (22) with pockets (33) for two or more torque transferring balls (24), a bias spring (38), and an axially displaceable thrust element (34) for transferring the bias spring load to the balls (24), and a driven clutch half (23) having cam surfaces (25) for cooperation with the balls (24), wherein the driving clutch half (22) includes means (36, 44, 45) for feeding pressure air to the cylinder chamber (30), and the thrust element (34) has a cylindrical skirt portion (43) for sealing guidance in the cylinder chamber (30). A valve (44, 45, 48, 49) is arranged to accomplish a bias spring (38) compressing air force on the thrust element (34) as the latter has been initially displaced a certain distance by the balls (24) at release of the clutch.