Hydraulic drive

Details Hydraulic drive Hydraulic drive

2005-11-29

2005-11-29

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

C091S402000, C091S409000

Reexamination Certificate

active

06968685

ABSTRACT:
A hydraulic drive (1) has a position selection device (2) in communication with a control valve (3) which, as a function of the actuation of the position selection device (2), controls the connection of an actuating cylinder (8) with a hydraulic fluid source (5) and a reservoir (6). A correction device provides a synchronization between the position of the position selection device (2) and the position of the actuating cylinder (8). The correction device has a sliding valve means (15) which detects a reference range of the actuating cylinder (8) and an on-off valve means (16) effectively connected mechanically with the position selection device (2). The on-off valve means (16) is open when the position selection device (2) is in the reference range and is closed when the position selection device (2) is not in the reference range.

REFERENCES:
patent: 4432270 (1984-02-01), Kyster et al.
patent: 5020618 (1991-06-01), Nagao
patent: 6131389 (2000-10-01), Sørensen
patent: 0 407 768 (1991-01-01), None
patent: 1 046 570 (2000-10-01), None
patent: 2 482 680 (1981-11-01), None
patent: 09 039 818 (1997-02-01), None

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