Hydraulic unit

Details Hydraulic unit Hydraulic unit

2011-02-22

2011-02-22

Lazo, Thomas E (Department: 3745)

Power plants

Pressure fluid source and motor

With control means for structure storing work driving energy

C060S416000

Reexamination Certificate

active

07891181

ABSTRACT:
A hydraulic unit, in particular for lifting and lowering loads in stacking trucks, has at least one working cylinder (10). The piston/rod unit (12) of the cylinder is guided movably in a housing (22). By a hydraulic pump (25), the piston/rod unit can be extended in its one drive direction (30) and can be retracted in its other opposite drive direction (32). A control device (20) actuates the displacement movements to that effect. A storage device (38) is fed energy in one drive direction (32). The energy fed in can be called up from the storage device (38) to assist a displacement movement in an opposite drive direction (30).

REFERENCES:
patent: 4761954 (1988-08-01), Rosman
patent: 6460332 (2002-10-01), Maruta et al.
patent: 198 44 648 (2000-02-01), None
patent: 10 2004 044 244 (2006-03-01), None
patent: 0 777 055 (1997-06-01), None
patent: 07-125994 (1995-05-01), None

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