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:
Jun. 14, 2011
Filed:
Dec. 06, 2006
Per-erik Larsson, Örebro, SE;
Thomas Östling, Eskilstuna, SE;
Per-Erik Larsson, Örebro, SE;
Thomas Östling, Eskilstuna, SE;
Atlas Copco Rock Drills AB, Orebro, SE;
Abstract
A damping device for inserting into a housing of an impulse producing drill machine, for damping Shockwave reflexes from a drill string connected to the drilling machine, is distinguished in that a first damping piston () for direct or indirect action against the drill string and for applying a pressure in the direction of the drill string an a second damping piston () for applying pressure in the direction against the drill string against a fixed stop () arranged in the housing, wherein the first () and the second damping piston () are arranged to co-operate for joint damping action with a drill bushing or shank adapter in a certain relative position. The invention also concerns a drilling machine.