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Parking brake system for railway vehicles

  • US 4,799,741 A
  • Filed: 03/04/1988
  • Issued: 01/24/1989
  • Est. Priority Date: 11/19/1986
  • Status: Expired due to Term
First Claim
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1. A protective device for charging a handbrake release pipe from a brake pipe comprising;

  • (a) brake pipe, auxiliary reservoir and handbrake release pipe ports,(b) cut-off, charging and exhaust pistons,(c) a charging passage extending from the brake pipe port to the handbrake pipe port including a charging check valve and a chamber at one side of the cut-off piston,(d) the charging passage also being connected to a chamber above the exhaust piston and below the charging piston, and(e) graduating spring means biasing the respective pistons in opposition to fluid pressure in the chambers adjoining the respecting pistons.

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