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:
Jan. 27, 2004
Filed:
Aug. 31, 2001
Roy Lee Robertson, Jr., Delbarton, WV (US);
James Earl, Jr., Proctorville, OH (US);
Earl Products, Inc., Proctorville, OH (US);
Abstract
A method for providing secondary roof support in an underground mine such as to reduce the hazard of localized crumbling or deterioration of a mine roof. The apparatus generally comprises a slightly convex steel plate, crafted to cradle a roof bolt and which is supported by the base plate of the primary roof control system. The apparatus is utilized with standard primary roof bolt systems. By applying an upward pressure on the roof and effecting a larger coverage area for each roof bolt, the opportunity for drawrock separation to begin is reduced, and the exposure of the elements to drawrock strata in the vicinity of the bolt is eliminated. The method includes the step of utilizing the apparatus, with convex portion of the lateral plate facing upwards, before the placement of the base plate and roof bolt.