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US 5,181,679 AGranted
Railway train speed restriction apparatus
AssigneeGeneral Railway Signal Corporation
InventorsKlaus Frielinghaus, Steven M. Ferrarese
Life of this patent
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AssigneeGeneral Railway Signal Corporation
InventorsKlaus Frielinghaus, Steven M. Ferrarese
Estimating the term…
Apparatus for use in a train speed control system which meets speed control signals, known as code rate signals, into a track section and restricts the injection of other signals which would allow faster train speeds. The apparatus enables speeds to be restricted in sections of the track where maintenance crews are working or otherwise where necessary or desirable. The apparatus is adaptable for use with many different configurations of speed control signals as may be used by different rapid transit authorities. The apparatus has a speed restriction carrier printed circuit board which presents a first set of contacts along an edge thereof which may be at the end of a slot into which a speed restriction selection printed circuit board is insertable in a plurality of different positions (eight positions for a square board). The speed restriction selection board has a plurality of second sets of contacts, two sets sharing the same edge of the board. These second sets of contacts provide different combinations of connections between the first set of contacts thereby imposing selected speed restrictions on speed control signals which are carried by the speed restriction carrier board.
In a railroad train speed control system having a source providing a plurality of control signals concerning allowable train speeds over a section of track, an improved apparatus for restricting the injection of said control signals corresponding to allowed train speeds above a certain speed said apparatus comprising means responsive to said control signals for generating signals for injection into said tracks and said apparatus having a first member having a first set of contacts, a plurality of contacts in said first set being connected to said source and at least one contact in said first set being connected to said generating and injection means, said apparatus having a second member having a plurality of sets of second contacts each in a different position on said second member, different ones of said second sets of contracts being engagable with said first set of contacts to provide different connections between the contacts of said first set for restricting the application of control signals above different allowed speeds to said injection means when said second member is received by said first member in different ones of said positions to provide engagement between said first contacts and different ones of said plurality of second sets of contacts.
Dependencies are inferred from the claim text.