Pneumatic control for braking system providing snow brake operation
CA 1212142 A · Owner: Westinghouse Brake And Signal Company Limited · Inventors: Langley, Keith W.; Washbourn, Jack
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A railway vehicle braking system is provided with a "snow brake" control arrangement which is used in freezing temperatures to apply a small brake force for prolonged periods to engage blocks or shoes on the vehicle wheels to reduce icing. The "snow brake" control arrangement itself includes an pneumatic valve system that includes a relay valve unit which, in a first mode, provides "snow brake" operation and, in a second mode, provides for application of brake pressure from the straight air pipe to the brake cylinders. A solenoid valve actuated responsive to energization of a control solenoid by a snow brake control switch controls, connection of "snow brake" pressure from a supply …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 30, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 30, 2003.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.