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:
Aug. 13, 2019
Filed:
Dec. 19, 2014
Atlas Copco Industrial Technique Ab, Stockholm, SE;
Per Thomas Söderlund, Värmdö, SE;
ATLAS COPCO INDUSTRIAL TECHNIQUE AB, Stockholm, SE;
Abstract
A hydraulic torque impulse generator includes a drive cylinder with a hydraulic fluid chamber, an output shaft with an impulse receiving portion connected to a radially movable seal element and intermittently dividing the hydraulic fluid chamber into high and low pressure compartments, and cam profiles which can displace the seal element from an idling position to a high pressure pulse generating position. A by-pass passage communicates fluid between the high and low pressure compartments, and a valve element movable between closed and open positions controls the fluid flow. The valve element is closed during pressure build-up in the high pressure compartment and opens when a high pressure pulse is completed, and is part of a control spindle coupled to the drive cylinder. The control spindle rotates through an angular play by inherent kinetic energy at an abrupt stop of the drive cylinder at the generation of each high pressure pulse.