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. 12, 1990
Filed:
Sep. 02, 1988
Applicant:
Inventor:
Edward Wechner, New South Wales, AU;
Assignee:
Joy Technologies Inc., Pittsburgh, PA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
E21C / ;
U.S. Cl.
CPC ...
173141 ; 173 34 ; 173 36 ; 173140 ;
Abstract
A mining roof bolt drill feed mechanism whereby the drill is supported on a horizontal pylon extending from an elongate slot in a vertical box section inner strut. The inner strut telescopes within an outer box section strut with an aligned elongate slot, and the pylon is supported on the nut of a dual concentric worm and nut drive system located within the telescopic struts. Elastomeric seals are provided over the elongate slots to prevent the ingress of dust from the mining operation.