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US 5,345,766 AGranted
Arrangement for carrying out a two-stage linear movement
AssigneeEngel Maschinenbau Gesellschaft m.b.H.
InventorsHeinz Leonhartsberger, Stefan Eppich, Werner Kappelmuller
Life of this patent
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Abstract
An arrangement for carrying out a two-stage linear movement with a stationary and a movable constructional unit, comprises a hydraulic cylinder and an hydraulic piston preferably in the form of a plunger. The hydraulic piston has a hollow volume which houses a plunger piston which, in turn, rests on a spindle rotated by a servomotor in the movable construct-ional unit. The plunger piston can be displaced axially in the hydraulic piston and also in the hydraulic cylinder by use of the spindle.
Claims15
An arrangement for carrying out two-stage linear movement comprising:
- a stationary unit having a first hydraulic cylinder (1) with a cylinder volume (19);
- pressure means operatively connected to the first hydraulic cylinder for building up pressure in the cylinder volume of the first hydraulic cylinder;
- a movable unit with a second hydraulic piston (2) mounted for movement in the first hydraulic cylinder, the second hydraulic piston (2) having a hollow volume (3) therein;
- a plunger piston (4) mounted for axial movement in the hollow volume of the second hydraulic piston (2) for building up pressure on the hollow volume of the second hydraulic piston;
- a nut (7) non-rotatable connected to the plunger piston (4);
- a spindle (6) rotatable threaded to the nut, the spindle (6) projecting into the plunger piston (4);
- an electric motor operatively connected to the spindle for rotating the spindle and moving the plunger piston in the second hydraulic cylinder in order to build up pressure in the hollow volume of the second hydraulic piston.
4 more elements
Dependencies are inferred from the claim text.