Device for controlling hydraulic power units

Woodworking – Special-work machine – Combined

Reexamination Certificate

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Details

C144S034100, C091S418000, C091S446000

Reexamination Certificate

active

07451790

ABSTRACT:
An arrangement for controlling two drive units which interact with one another, one of which includes a hydraulically driven motor (2). The motor drives a varying load, and one or more valves (6, 7) control hydraulic fluid flow through the motor during operation and for starting and stopping of the motor. One of the valves is a flow control valve (7) for flow control of the hydraulic fluid flow through the motor. The second drive unit (37) performs a working movement which, under the action of hydraulic flow influences the loading of the motor. The flow of the hydraulic fluid to the second drive unit is controlled in a coordinated way with the control of the flow through the motor.

REFERENCES:
patent: 2795933 (1957-06-01), McCallum
patent: 2878015 (1959-03-01), Panissidi
patent: 4722258 (1988-02-01), Johnson
patent: 5293914 (1994-03-01), Hudson
patent: 6041683 (2000-03-01), Timperi et al.
patent: 6986368 (2006-01-01), Brown
patent: 7017460 (2006-03-01), Virvalo et al.
patent: 2006/0249015 (2006-11-01), Vallebrant
patent: 2007/0034077 (2007-02-01), Vallebrant et al.

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