Railway rolling stock – Trucks – Bogie
Patent
1994-07-01
1996-09-17
Oberleitner, Robert J.
Railway rolling stock
Trucks
Bogie
B61F 300
Patent
active
055558178
ABSTRACT:
A novel friction wedge for use in a bolster pocket of a truck of a railroad car, comprises a metal body portion having a vertical wall and one or more pad members supported on the surface of a pad-support body. The metal body portion has a vertical wall the exterior surface of which body bears against a guide column of the side frame. The pad-support body, which is part of the metal body portion, is provided with an inclined surface upon which is secured a polymer pad with a central planar inclined surface which bears against the correspondingly inclined surface of the pocket. The pad member is required to be formed from specified reaction injection molded (RIM) polymers which it is found to be free of microscopic voids >20 .mu.m and therefore, fully dense, unlike prior art polymer pads for friction wedges. This property of being fully dense unexpectedly allows the pad to have specified physical properties which permit a railroad car truck equipped with the friction wedges to operate with exceptional reliability, safety and for a long period of time. In a particular embodiment, the design of the pad(s) permits relative movement of the pad and the metal body of the friction wedge to locate the center of pressure accurately on the friction wedge, under load, and this further improves the effectiveness of the friction wedge and extends its useful life.
REFERENCES:
patent: 2053990 (1936-09-01), Goodwin
patent: 2333921 (1943-11-01), Flesch
patent: 3559589 (1971-02-01), Williams
patent: 4174140 (1979-11-01), Bogar
patent: 4230047 (1980-10-01), Wiebe
patent: 4295429 (1981-10-01), Wiebe
patent: 4344365 (1982-08-01), Fritz
patent: 4426934 (1984-01-01), Geyer
patent: 4875813 (1989-10-01), Moyer
patent: 4915031 (1990-04-01), Wiebe
patent: 4974521 (1990-12-01), Eungard
patent: 5176083 (1993-01-01), Bullock
Compressive and Shear Load/Deflection Testing of Two Designs of Plastic Pad Equipped Railroad Freight Car Truck Friction Castings-Engineering Systems Inc. Report.
Brunkhorst Philip J.
Taillon Armand P.
Bartz C. T.
Lobo Alfred D.
Oberleitner Robert J.
Standard Car Truck Company
LandOfFree
Pad of substantially rigid synthetic resin for a friction wedge does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Pad of substantially rigid synthetic resin for a friction wedge , we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Pad of substantially rigid synthetic resin for a friction wedge will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-407386