Expansible chamber devices – With guide or seal on cylinder end portion for piston or...
Reexamination Certificate
2007-05-01
2009-10-27
Lazo, Thomas E (Department: 3745)
Expansible chamber devices
With guide or seal on cylinder end portion for piston or...
C092S168000
Reexamination Certificate
active
07607383
ABSTRACT:
A rod sealing system for use with a hydraulic cylinder is disclosed. The hydraulic cylinder has a cylinder tube and a cylinder head defining a working chamber. A piston is disposed for linear reciprocable movement within the working chamber and is connected to a piston rod projecting outwardly through the cylinder head. The rod sealing system includes a primary seal acting between the cylinder head and the piston rod and a secondary seal acting between the cylinder head and the piston rod. The rod sealing system also includes a back-up seal acting between the cylinder head and the piston rod and the cylinder head has a bypass channel fluidically connecting the working chamber with a chamber in the cylinder head between the back-up seal and the primary seal. Flow of hydraulic fluid through the bypass channel is selectively allowed or prevented with a bypass valve to selectively equalize the pressure across said back-up seal when the back-up seal is not in service.
REFERENCES:
patent: 2573567 (1951-10-01), Hancock
patent: 3540741 (1970-11-01), Lefebvre
patent: 3642069 (1972-02-01), Adkins
patent: 4084668 (1978-04-01), Rybicki
patent: 4088061 (1978-05-01), Stoll et al.
patent: 4227573 (1980-10-01), Pearce et al.
patent: 4476772 (1984-10-01), Gorman et al.
patent: 4681516 (1987-07-01), O'Hara et al.
patent: 5014603 (1991-05-01), Navarette et al.
patent: 5107970 (1992-04-01), Driessen et al.
patent: 5469704 (1995-11-01), Kramer
patent: 5495792 (1996-03-01), Izumi et al.
patent: 5575626 (1996-11-01), Brown et al.
patent: 6158967 (2000-12-01), Dupre
patent: 6547046 (2003-04-01), Yamaguchi et al.
patent: 6758127 (2004-07-01), Schult
patent: 7011193 (2006-03-01), Lemmens et al.
patent: 2006/0272498 (2006-12-01), Fischer
patent: 0067239 (1982-12-01), None
patent: 0295395 (1988-12-01), None
patent: 0997254 (2000-05-01), None
patent: 2000046092 (2000-02-01), None
Lazo Thomas E
Wegman Hessler & Vanderburg
LandOfFree
System for backup rod seal for hydraulic cylinder does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with System for backup rod seal for hydraulic cylinder, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and System for backup rod seal for hydraulic cylinder will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4086523