Patent ID: 7001109
Filing Date: 2006-02-21
Classification: E21D

Abstract:
1. An improved apparatus for ground support rotatable by rotation means, said improved apparatus adapted for insertion into a drilled hole penetrating a rock face, the improved apparatus comprising: a. a tensionable reinforcing member comprising: b. at least one nut threadably receivable by the tensionable reinforcing member first end threaded portion, said at least one nut having a body, said body comprising: c. at least one bearing plate used in combination with the at least one nut, said at least one bearing plate having a central domed portion and a circular aperture positioned centrally within said central domed portion, wherein the at least one bearing plate is adapted for placement upon the first end threaded portion of the tensionable reinforcing member, and wherein the at least one bearing plate is positianable between the rock face and the at least one nut convex hemispherical portion so that the central domed portion is adjacent to and in confronting relation to the at least one nut convex hemispherical portion, and further wherein said central domed portion circular aperture is adapted for pivoting engagement with the convex hemispherical portion of the at least one nut thereby permitting use of the improved apparatus on uneven rock faces; and, d. at least one shearing element comprising a rolled spring member manufactured from carbon steel adapted to shear at a predetermined torque