John Max Rohde

US Patent:

45571473, Dec 10, 1985

Filed:

May 14, 1984

Appl. No.:

6/609967

Inventors:

John R. Rohde - Ames IA
John M. Pitt - Nevada IA

Assignee:

Iowa State University Research Foundation, Inc. - Ames IA

International Classification:

G01N 324
G01N 3324

US Classification:

73784

Abstract:

The bore hole rock shear testing device of the present invention comprises a case assembly having a longitudinal axis, a driving block, at least one wedge member, and a restraint member. The wedge member is positioned between the restraint member and the driving block and includes a rock engaging surface facing radially outwardly from the longitudinal axis of the case assembly. The driving block and the wedge member have complimentary tapered surfaces which cause the rock engaging surface to be urged radially outwardly when the wedge member is compressed or squeezed between the driving block and the restraint member. Power means are provided for moving the driving block toward the restraint member, and a restraint mechanism selectively holds the restraint member against movment. The restraint mechanism is movable to an inoperative position which results in both outward radial forces and axial forces being applied simultaneously to the rock engaging surface when the driving block is moved toward the wedge member and the restraint member.