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:
Mar. 16, 2010
Filed:
Apr. 29, 2005
Anders Urban Jansson, Älvsjö, SE;
Anders Urban Jansson, Älvsjö, SE;
Atlas Copco Tools AB, Nacka, SE;
Abstract
An over-speed safety device for a pneumatic rotation motor having a cylinder (), a forward end wall (), a rear end wall () with a pressure air inlet opening (), a rotor (), and an actuator () co-rotative with the rotor () and responsive to centrifugal action, and a valve lid () tiltable relative to a pivot axis (C) and shiftable between an open position and a closed position for controlling the airflow though the inlet opening (), wherein the pivot axis (C) extends along a chord in relation to the rotor centre, and the actuator () comprises a cam surface () for camming engagement with the valve lid () for moving the latter in a radial direction toward the closed position. The valve lid () is supported by ridge positions () on a seat surface () disposed around the inlet opening (), and a wire spring () is arranged to retain and bias the valve lid () against the seat surface (). The ridge portions () are arranged to make the valve lid () perform an over-centre movement when shifted from open to closed position, thereby obtaining a bi-stable action of the valve lid () under action of the wire spring ().