Railway draft appliances – Cushioned – Combined spring and friction
Reexamination Certificate
2007-12-25
2007-12-25
Le, Mark T. (Department: 3617)
Railway draft appliances
Cushioned
Combined spring and friction
C213S043000, C213S024000, C213S035000, C213S041000
Reexamination Certificate
active
11201894
ABSTRACT:
A draft gear assembly including a housing having an open front and closed rear portions. A compressible cushioning element is positioned within the rear portion with a seating arrangement abutting one end thereof adjacent the open front portion. A friction cushioning element is provided in the open front portion of the housing. A spring release mechanism continuously urges the friction cushioning element outwardly from the compressible cushioning element thereby releasing such friction cushioning element after compression of such draft gear assembly. A compressible cushioning element includes a hydraulic cylinder having a slidable piston to define a high pressure chamber and a low pressure chamber. A positional variable metering assembly is disposed within the piston to increase the reaction fluid pressure in the low pressure chamber for increasing the shock absorbing capacity of such draft gear assembly during operational buff conditions and to reduce the reaction fluid in the low pressure chamber pressure for meeting the requirements of the drop hammer test.
REFERENCES:
patent: 3368698 (1968-02-01), Cardwell
patent: 3534870 (1970-10-01), Daugherty, Jr.
patent: 4601461 (1986-07-01), Brough et al.
patent: 4645187 (1987-02-01), Kanjo
patent: 5152409 (1992-10-01), Sommerfeld
patent: 5529194 (1996-06-01), Merker
patent: 6446820 (2002-09-01), Barker
patent: 6488162 (2002-12-01), Carlstedt
patent: 6923331 (2005-08-01), Sommerfeld
patent: 866233 (1959-06-01), None
James Ray & Assoc.
Le Mark T.
WABTEC Holding Corp.
LandOfFree
Positional variable orifice pin for hydraulic pressure... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Positional variable orifice pin for hydraulic pressure..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Positional variable orifice pin for hydraulic pressure... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3891238