US 5,201,890 AGranted

Railroad car handbrake release system

AssigneeTransit America, Inc.

InventorsRobert J. Sauer, Michael J. Pavlick

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Abstract

A manually operated railroad car handbrake release system in which the release of the handbrake at one end of a car automatically causes release of the brakes at the opposite end of the same car. The system utilizes the standard type handbrake, but has affixed to each of the handbrake units a hydraulic cylinder, with interconnecting hydraulic lines between hydraulic cylinders located at opposite ends of the railcar. Brake releasing actuation at one handbrake unit pressurizes the hydraulic system so that the cylinder affixed to the brake unit at the opposite end of the car is also actuated to operate the release handle and release the brake at that end. When the release handles are actuated and released, return springs disposed about the cylinders piston rods automatically return the release handles and pistons at both ends to their non-actuated positions. The brake release system is operative from either end of the railroad car, and does not include any provision for resetting the brakes. Setting of the manually operated brakes is carried out as though the brake release system did not exist, namely, each brake mechanism must be individually operated to set its associated brake.

Claims11

Dependent claims

A manually operated railroad car handbrake release system for simultaneously releasing the manually set car brakes at opposite ends of the car whenever the brakes at either end of the car are released, comprising in combination,

a) first and second manually operated handbrakes each including a brake setting mechanism and a brake releasing means, said first handbrake being fixedly located at one end of the railroad car and said second handbrake being fixedly locatable at the other end of the railroad car,
b) a first actuatable hydraulic cylinder mechanically coupled to an actuatable by said brake releasing means of said first manually operated handbrake, said first hydraulic cylinder having upper and lower ports and a piston connected to a piston rod having a free end, and means biasing said piston to one end of said cylinder with the piston rod and its free end positioned out of said cylinder,
c) a second actuatable hydraulic cylinder mechanically coupled to and actuatable by said brake releasing means of said second manually operated handbrake, said second hydraulic cylinder having upper and lower ports and a piston connected to a piston rod having a free end, and means biasing said piston to one end of said cylinder with the piston rod and its free end positioned out of said cylinder,
d) hydraulic fluid carrying means intercoupling said first and second hydraulic cylinders,
each of said first and second hydraulic cylinders being effective responsive to actuation by its associated brake releasing means to actuate the other of said first and second hydraulic cylinders via said hydraulic fluid carrying means and to thereby actuate the other brake releasing means to release the brakes of both of said first and second manually operated handbrakes. compression spring disposed about its associated piston rod outside of said cylinders.

2 more elements

a) first and second manually operated handbrakes each including a brake setting mechanism and a brake releasing means, said first handbrake being fixedly located at one end of the railroad car and said second handbrake being fixedly locatable at the other end of the railroad car,
b) a first actuatable hydraulic cylinder mechanically coupled to and actuatable by said brake releasing means of said first manually operated handbrake, said first hydraulic cylinder having upper and lower ports and a piston connected to a piston rod having a free end, and means biasing said piston to one end of said cylinder with the piston rod and its free end positioned out of said cylinder,
c) a second actuatable hydraulic cylinder mechanically coupled to and actuatable by said brake releasing means of said second manually operated handbrake, said second hydraulic cylinder having upper and lower ports and a piston connected to a piston rod having a free end, and means biasing said piston to one end of said cylinder with the piston rod and its free end positioned out of said cylinder,
d) a pair of hydraulic lines intercoupling said first and second hydraulic cylinders, one of said pair of lines connecting the upper port of said first cylinder to the lower port of said second cylinder, and the other of said pair of lines connecting the upper port of said second cylinder to the lower port of said first cylinder,
each of said first and second hydraulic cylinders being effective responsive to actuation by its associated brake releasing means to actuate the other of said first and second hydraulic cylinders via said pair of hydraulic lines and to thereby actuate the other brake releasing means to release the brakes of both of said first and second manually operated handbrakes.

2 more elements

Dependencies are inferred from the claim text.