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. 15, 2012
Filed:
Apr. 16, 2009
Yarom Polsky, Oak Ridge, TN (US);
Mark C. Grubelich, Albuquerque, NM (US);
Mark R. Vaughn, Albuquerque, NM (US);
Yarom Polsky, Oak Ridge, TN (US);
Mark C. Grubelich, Albuquerque, NM (US);
Mark R. Vaughn, Albuquerque, NM (US);
Sandia Corporation, Albuquerque, NM (US);
Abstract
A method and means of minimizing the effect of elastic valve recoil in impact applications, such as percussive drilling, where sliding spool valves used inside the percussive device are subject to poor positioning control due to elastic recoil effects experienced when the valve impacts a stroke limiting surface. The improved valve design reduces the reflected velocity of the valve by using either an energy damping material, or a valve assembly with internal damping built-in, to dissipate the compression stress wave produced during impact.