Fluid-pressure and analogous brake systems – Load control – Railway vehicle
Reexamination Certificate
2007-05-15
2007-05-15
McClellan, James (Department: 3683)
Fluid-pressure and analogous brake systems
Load control
Railway vehicle
C303S022700, C188S033000, C188S15300R, C188S072100, C188S072700
Reexamination Certificate
active
10971875
ABSTRACT:
An apparatus engageable with a railway vehicle truck-mounted braking system for compensating for truck bolster movement which includes at least one force transmitting wedge member movable in a reciprocating motion by a pneumatic actuator. The at least one force transmitting wedge member engage rollers rotateably attached to a return push rod member disposed within the truck-mounted braking system for extending the return push rod member to reduce brake shoe clearance prior to brake shoe application. A method for compensating for truck bolster movement also includes fully pressurizing a wedge actuator prior to pressurizing the main brake apparatus actuator. Depressurization of the system returns the force transmitting wedges and return push rod to their original positions upon completion of brake application, subsequently increasing brake shoe clearance for allowable truck bolster movement.
REFERENCES:
patent: 3101814 (1963-08-01), Newell
patent: 3637054 (1972-01-01), Billeter
patent: 3893544 (1975-07-01), Means
patent: 4291789 (1981-09-01), Bogenschutz et al.
patent: 6241057 (2001-06-01), Hiatt
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patent: 6761253 (2004-07-01), Kanjo et al.
James Ray & Assoc.
McClellan James
Sy Mariano
Wabtec Holding Corp.
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