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:
May. 31, 2005
Filed:
Oct. 28, 2003
Karl-johan Lars Elsmark, Saltsjö-Boo, SE;
Gunnar Christer Hansson, Stockholm, SE;
Anders Urban Jansson, Älvsjö, SE;
Karl-Johan Lars Elsmark, Saltsjö-Boo, SE;
Gunnar Christer Hansson, Stockholm, SE;
Anders Urban Jansson, Älvsjö, SE;
Atlas Copco Tools AB, Nacka, SE;
Abstract
An overspeed safety device for a pneumatic rotation motor having a stator () with an air inlet passage (), a rotor (), and a speed governor for determining a maximum speed level, and comprising a speed responsive actuator () connected to the rotor () and a valve () shiftable by the actuator () from a normally open position to a closed position so as to block or substantially restrict the air flow through the inlet passage () at the attainment of motor speed levels exceeding a predetermined maximum level should the speed governor malfunction, wherein the actuator () comprises a spring biassed contact element () connected to the rotor () and responsive to centrifugal action, and the valve () comprises a disc-shaped valve element () pivotally supported in the inlet passage () and maintained in its open position by one magnet () and in its closed position by another magnet ().