Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Reexamination Certificate
2005-03-22
2005-03-22
Look, Edward K. (Department: 3745)
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
C091S466000
Reexamination Certificate
active
06868672
ABSTRACT:
A swing speed compensation device is provided for use with a flow sharing hydraulic system. The present invention is mounted within the metering spool of a flow sharing valve and includes a poppet that is attached to a spring retainer. The spring retainer encases a compression spring which pushes against a plug and has a drain hole that, depending upon the position of the spring retainer and poppet combination, can vent excess pressure within the present invention to a hydraulic pump tank. When a flow sharing hydraulic system starts or stops, there is a rush in the fluid flow that can cause a spike in the system pressure. The present invention absorbs this pressure spike, allowing for the fluid flow to gradually increase or decrease as the system starts or stops.
REFERENCES:
patent: 2965133 (1960-12-01), Rice et al.
patent: 3722543 (1973-03-01), Tennis
patent: 4518004 (1985-05-01), Hsu et al.
patent: 4878418 (1989-11-01), Badia
patent: 4887643 (1989-12-01), Tomlin et al.
patent: 4953582 (1990-09-01), Kennedy
patent: 5065664 (1991-11-01), Ohta et al.
patent: 5161575 (1992-11-01), Morikawa et al.
patent: 58128488 (1983-08-01), None
Leslie Michael
Look Edward K.
Sauer-Danfoss Inc.
LandOfFree
Method of controlling a swinging boom and apparatus for... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of controlling a swinging boom and apparatus for..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of controlling a swinging boom and apparatus for... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3456322