Electrohydraulic servo door drive for operating a door, a...

Details Electrohydraulic servo door drive for operating a door, a... Electrohydraulic servo door drive for operating a door, a...

2005-12-27

2005-12-27

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Condition responsive control of motive fluid flow

C060S466000, C091S442000

Reexamination Certificate

active

06978609

ABSTRACT:
The invention pertains to an electrohydraulic servo door drive for operating a door, a window, or the like, with a hold-open function, where a valve is installed in the hydraulic circuit to implement the hold-open function. To create an electrohydraulic servo door drive which requires less space and can be produced at lower cost, it is provided according to the invention that the valve is designed as a hydraulically controlled hold-open valve.

REFERENCES:
patent: 3060688 (1962-10-01), Gondek
patent: 3699993 (1972-10-01), Herion et al.
patent: 4143310 (1979-03-01), Fujinawa et al.
patent: 4367087 (1983-01-01), Cardenas Franco et al.
patent: 4813655 (1989-03-01), Hennells
patent: 5048644 (1991-09-01), Pelto-Huikko
patent: 5259293 (1993-11-01), Brunner
patent: 5355773 (1994-10-01), Winkels
patent: 5373121 (1994-12-01), Nagel
patent: 5526673 (1996-06-01), Avitan
patent: 5687451 (1997-11-01), Singer
patent: 5816132 (1998-10-01), Langner et al.
patent: 5996466 (1999-12-01), Heusser
patent: 6098647 (2000-08-01), Haussler et al.
patent: 6175204 (2001-01-01), Calamatas
patent: 6198241 (2001-03-01), Calamatas
patent: 6329771 (2001-12-01), Choi et al.
patent: 6843340 (2005-01-01), Miller

Affiliated with

Also associated with

Rating

Electrohydraulic servo door drive for operating a door, a... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Electrohydraulic servo door drive for operating a door, a..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Electrohydraulic servo door drive for operating a door, a... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3519624