Automatic parking brake for body mounted brake cylinder

Patent metadata

Field	Value
Publication number	US-10011289-B2
Application number	US-201615356948-A
Country	US
Kind code	B2
Filing date	Nov 21, 2016
Priority date	Nov 21, 2016
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

A locking mechanism for a brake cylinder that has a tube surrounding the hollow shaft of the brake cylinder with a first set of teeth formed along an outer surface thereof. A gate having a second set of teeth corresponding to the first set of teeth is moveable in between a first position, wherein the first and second set of teeth are engaged to prevent movement of the brake cylinder piston, and a second position where the first and second set of teeth are disengaged to allow movement of the brake cylinder piston. A spring biases the gate into the locked position and a supplemental piston responsive to a source of brake pipe pressure can move the gate into the unlocked position so that the main piston is free to move.

First claim

What is claimed is:

1. A locking mechanism for a brake cylinder, comprising:
a tube having a first set of teeth formed along an outer surface thereof;
a gate having a second set of teeth corresponding to the first set of teeth that is moveable between a first position, wherein the first and second set of teeth are engaged, and a second position, where the first and second set of teeth are disengaged;
a spring biasing the gate into the first position;
a piston responsive to a source of pressure that is interconnected to the gate to move the gate into the second position, wherein the piston is interconnected to the gate by a lever and a cam that can be rotated by the lever to impart a force into the gate to move it into the second position.

2. The locking mechanism of claim 1 , wherein the cam can impart the force into the gate by engaging a roller positioned between the cam and the gate.

3. The locking mechanism of claim 2 , wherein the gate includes a flange positioned proximately to the cam.

4. The locking mechanism of claim 3 , wherein the gate is positioned in a slot that extends transversely to the tube.

5. The locking mechanism of claim 4 , wherein the source of pressure is a source of brake pipe pressure.

6. The locking mechanism of claim 5 , wherein the piston is biased in a first direction by a spring to remove the force from the gate and by the source of brake pipe pressure in the opposite direction to apply the force to the gate.

7. A brake cylinder, comprising:
a main piston moveable in response to pneumatic pressure supplied to a chamber behind the piston by a source of brake cylinder pressure;
a spring biasing the piston into a brakes released position in the absence of pressure in the chamber;
a shaft having a hollow cavity coupled to the main piston and moveable therewith;
a tube surrounding the shaft and coupled to the main piston, wherein the shaft has a first set of teeth formed along an outer surface thereof;
a gate having a second set of teeth corresponding to the first set of teeth that is moveable between a first position, wherein the first and second set of teeth are engaged to prevent movement of the main piston, and a second position where the first and second set of teeth are disengaged to allow movement of the main piston;
a gate spring biasing the gate into the first position;
a parking brake piston responsive to a source of pressure and interconnected to the gate to move the gate into the second position, wherein the parking brake piston is interconnected to the gate by a lever and a cam that can be rotated by the lever to impart a force into the gate to move it into the second position.

8. The brake cylinder of claim 7 , wherein the cam can impart the force into the gate by engaging a roller positioned between the cam and the gate.

9. The brake cylinder of claim 8 , wherein the gate includes a flange positioned proximately to the cam.

10. The brake cylinder of claim 9 , wherein the gate is positioned in a slot that extends transversely to the tube.

11. The brake cylinder of claim 10 , wherein the source of pressure is a source of brake pipe pressure.

12. The brake cylinder of claim 11 , wherein the piston is biased in a first direction by a spring and by the source of brake pipe pressure in the opposite direction.

Assignees

• New York Air Brake Llc

Inventors

• Call Derick
• Lacosse Justin
• Hughes Craig Floyd
• Vendlinski James Lewis

Classifications

• B61H13/34 Primary

  Details · CPC title

• F15B15/261

  using positive interengagement, e.g. balls and grooves, for locking in the end positions · CPC title

• F16D2127/06

  Locking mechanisms, e.g. acting on actuators, on release mechanisms or on force transmission mechanisms · CPC title

• B60T17/16 Primary

  Locking of brake cylinders · CPC title

• B61H13/02

  Hand or other personal actuation · CPC title