Low voltage hydraulic system with electronic control for...

Details Low voltage hydraulic system with electronic control for... Low voltage hydraulic system with electronic control for...

2007-05-11

2010-02-23

Lazo, Thomas E (Department: 3745)

Power plants

Pressure fluid source and motor

Having a signal, indicator or inspection means

C091S001000

Reexamination Certificate

active

07665298

ABSTRACT:
The invention concerns a hydraulic system for moving automatic closing apparatuses, comprising hydraulic actuating means capable to move at least one movable member coupled to at least one closing apparatus, wherein said hydraulic actuating means is operated by at least one low voltage dc motor. Preferably, the electronic unit controls, through an encoder and microswitches, the position of a piston or a rotating shaft that operates the automatic closing apparatus during closing and opening phase, favouring an automatic learning of operation times.

REFERENCES:
patent: 2790340 (1957-04-01), Cross
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patent: 4726282 (1988-02-01), LaBair
patent: 4762304 (1988-08-01), Hill
patent: 5035082 (1991-07-01), Butler
patent: 5161957 (1992-11-01), Ribaudo
patent: 5373664 (1994-12-01), Butler
patent: 5417011 (1995-05-01), Keszthelyi
patent: 6425820 (2002-07-01), Kennedy et al.
patent: 6978609 (2005-12-01), Busch
patent: 2003/0213092 (2003-11-01), Fischbach et al.

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