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, 1977
Filed:
Dec. 09, 1975
John Charles Purcupile, Monroeville, PA (US);
Angela L Lenden, Coraopolis, PA (US);
Thomas A Mutschler, Pittsburgh, PA (US);
Joel D Kneisley, Cleveland, OH (US);
Mark P Wieszczyk, San Francisco, CA (US);
Ronald Lasser, Williamsville, NY (US);
Donald W Fulmer, Morgantown, WV (US);
Carnegie-Mellon University, Pittsburgh, PA (US);
Abstract
A roof pin-or-bolt setting machine which applies sonic energy to drive bolts which may be of non-circular section or helical into the roof of a coal mine. The energy is supplied by a bar which is set into sonic vibration in its bending mode so that there is a standing wave along the bar having nodes and anti-nodes. The bolt is supported vertically at an anti-node position of the bar and is driven into the roof as the bar is vibrated. Continuous vertical force is applied to the bar to maintain the bolt in engagement with the roof under pressure.