FIELD: mechanical engineering. SUBSTANCE: this relates to clamping devices. Cramp has stirrup with stationary jaw on its first end, and moving jaw in the form of rocker on second end of stirrup. Double-side rod of hydraulic cylinder is pivotally secured on stationary jaw. Body is pivotally fastened on moving jaw and is provided with bracket. Cramp is provided with additional hydraulic cylinder. Case of additional hydraulic cylinder is rigidly secured on bracket. Rod of additional hydraulic cylinder carries piston. Rigidly fastened on one end of rod is wedge. This wedge can interact by its incline surface with end face of main hydraulic cylinder rod, and it can interact by its opposite plane with bracket stops. Aforesaid embodiment of cramp improves reliability of its operation. EFFECT: higher efficiency. 4 dwg
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