Patent ID: 7827868
Filing Date: 2010-11-09
Classification: G01N

Abstract:
1. Apparatus for use in a materials testing machine for securely holding a specimen grip in a fixed position relative to a jaw housing, the apparatus comprising: the jaw housing containing the specimen grip, the grip having two external opposing inclined faces, each of the faces abutting against a corresponding one of two complementary interior faces of the jaw housing, the two complementary faces and a bottom interior surface of the housing collectively forming a cavity in the jaw housing which accommodates the specimen grip; and a cam jack situated in a recess in the housing below the cavity, wherein the cam jack abuttingly engages with an underside of the specimen grip and an opposing interior surface of the housing and generates an increasing mechanical force which moves the faces of the specimen grip against the complementary faces of the housing so as to frictionally lock the specimen grip into the fixed position in the jaw housing, the cam jack having: