Hydraulic swinging-leaf door drive

Details Hydraulic swinging-leaf door drive Hydraulic swinging-leaf door drive

2005-05-10

2005-05-10

Look, Edward K. (Department: 3745)

Power plants

Pressure fluid source and motor

Pump means moves motive fluid from one chamber to an...

C060S475000

Reexamination Certificate

active

06889501

ABSTRACT:
A hydraulic swinging-leaf door drive for swinging doors includes an actuating piston, which acts on a drive shaft. A hydraulic pump acts on the actuating piston by way of a hydraulic circuit. The hydraulic circuit is designed as a closed circuit.

REFERENCES:
patent: 1927580 (1933-09-01), Wisner
patent: 2298542 (1942-10-01), Potter et al.
patent: 3003317 (1961-10-01), Schroeder et al.
patent: 3083535 (1963-04-01), Krafft et al.
patent: 5778671 (1998-07-01), Bloomquist et al.
patent: 6739130 (2004-05-01), Prampolini

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