GRIP OF TESTING MACHINE Russian patent published in 1994 - IPC

FIELD: testing equipment. SUBSTANCE: grip comprises box-shaped casing with a hole and a pair of opposite guide walls converging towards said hole, wedge-shaped jaws disposed in force stimulator body, a chain of wedges installed in casing with a provision for moving relative to one another. Wedges have the shape of four-sided straight prisms one side of which forms the wedge angle. The casing has projections on internal surface of the wall with a hole. The number of wedges and the wedge angle are determined by the following relations: 90^°<ϕ<45^° (ctgϕ)ⁿ=2F/Pctgα where v - wedge angle, n - number of wedges, F - required specimen clamping force, P - force of force stimulator, a - wedge angle of jaw. EFFECT: higher reliability. 5 dwg