Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Reexamination Certificate
2007-04-16
2010-02-23
Bagnell, David J. (Department: 3672)
Hydraulic and earth engineering
Underground passageway, e.g., tunnel
Boring
C405S132000, C049S339000, C049S340000
Reexamination Certificate
active
07665930
ABSTRACT:
A hydraulic system has a hydraulic actuator for moving a door leaf of a door installation between open and closed positions thereof. A reservoir has a volume for containing a hydraulic fluid. A fluid circuit provides fluid communication between the hydraulic actuator and the reservoir. The system also has a pump for pumping hydraulic fluid from the reservoir into the fluid circuit to operate the actuator. A fluid circuit flushing system of the hydraulic system operates to flush a volume of hydraulic fluid from the fluid circuit back to the reservoir without moving any door leaves of the door installation. The hydraulic system may be part of a mine door installation installed in a mine passageway and having at least one door leaf. The hydraulic actuator is connected to the door leaf for driving movement of the door leaf between its open and closed positions.
REFERENCES:
patent: 2764147 (1956-09-01), Brunner
patent: 3530958 (1970-09-01), Brannon et al.
patent: 4082331 (1978-04-01), Kennedy et al.
patent: 4118894 (1978-10-01), Kennedy et al.
patent: 4162718 (1979-07-01), Lamprey
patent: 4373294 (1983-02-01), Kennedy et al.
patent: 4478535 (1984-10-01), Kennedy et al.
patent: 4523406 (1985-06-01), Kennedy et al.
patent: 4785915 (1988-11-01), Shah et al.
patent: 4911577 (1990-03-01), Kennedy et al.
patent: 5118259 (1992-06-01), Bishoff
patent: 5168667 (1992-12-01), Kennedy et al.
patent: 5240349 (1993-08-01), Kennedy et al.
patent: 5971068 (1999-10-01), Ochiai et al.
patent: 6032986 (2000-03-01), Kennedy et al.
patent: 6164871 (2000-12-01), Kennedy et al.
patent: 6425820 (2002-07-01), Kennedy et al.
patent: 6594954 (2003-07-01), Kennedy et al.
patent: 6938372 (2005-09-01), Kennedy et al.
patent: 6955594 (2005-10-01), Kennedy et al.
patent: 2003/0079423 (2003-05-01), Kennedy et al.
patent: 2005/0099020 (2005-05-01), Kennedy et al.
Kennedy John M.
Kennedy William R.
Bagnell David J.
Fiorello Benjamin
Kennedy Metal Products & Buildings, Inc.
Senniger Powers LLP
LandOfFree
Hydraulically powered door and systems for operating same in... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Hydraulically powered door and systems for operating same in..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Hydraulically powered door and systems for operating same in... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4151190