Brakes – Vehicle – Railway
Reexamination Certificate
2007-12-11
2007-12-11
Williams, Thomas (Department: 3683)
Brakes
Vehicle
Railway
Reexamination Certificate
active
11134592
ABSTRACT:
The present invention relates to a fail-safe skate retarder that applies a braking force proportional to the weight of a rail car entering the retarder. Each segment of the retarder includes a lever mechanism with a pair of levers rotatably joined under the running rail. Each lever holds a braking rail for engaging a wheel of the car. The retarder is normally in a lower, fail-safe position with the brake rails closer together than the width of the wheel. When the car enters the retarder, the wheel forces the brake rails apart into a braking position, and the middle of the lever mechanism rises to lift the running rail and car. A hydraulic power unit and cylinder is activated to raise the middle of the lever mechanism even further to a release position so that the brake rails are spread apart more than the width of the wheel.
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General Railway Signal Corporation, SASIB Railway GRS, Type F Series Hydraulic Car Retarders, Jun. 1997.
AAA Sales and Engineering, Inc., R-2 Service Manual 0907, Admitted prior art.
Heyden Thomas J.
Zawlocki Mark
AAA Sales & Engineering Inc.
Andrus Sceales Starke & Sawall LLP
Williams Thomas
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