MECHANICAL HYDRAULIC CLAMPS Russian patent published in 1996 - IPC

FIELD: mechanical engineering, in particular, clamping of parts to be machined on metal-working machine. SUBSTANCE: clamps have body 1, immovable jaw and movable jaw 3, preliminary clamping mechanism with screw 4 for displacement of jaw 3, tightening force enhancing mechanism having hydraulic cylinder with piston 5, whose stem 6 is provided with thread 7, smaller diameter hydraulic cylinder with piston 8 and pusher 9, and unit for controlling both mechanisms. This unit has handle 10 with nut 12 positioned within handle cavity . Nut 12 has outer cylindrical surface 11. Screw 4, handle 10 and nut 12 are provided with engagement members A,C,B for providing alternative engagement of handle with preliminary clamping mechanism (A-C) or only with tightening force enhancing mechanism (C-B), respectively. Screw 4 has inner thread 14 engageable with thread 7 of stem 6 and outer thread 15 with opposite direction of coils for engagement with thread of jaw 3. EFFECT: increased efficiency, simplified construction, wider operational capabilities and enhanced reliability in operation. 2 cl, 2 dwg