Antenna apparatus for vehicle track rail signals
AssigneeWestinghouse Electric Corp.
InventorsDavid H. Woods, Robert H. Perry
Life of this patent
Estimating the term…
Abstract
An antenna apparatus is disclosed for improved coupling of audio signals in relation to the vehicle track of a transit system operative with steel rails and providing a reduced cost for the associated hardware and lower crosstalk with adjacent signal blocks and track rails.
Claims9
In an antenna apparatus for providing a signal current in at least one track rail of a track circuit lying in a plane and including a plurality of signal blocks for the control of a vehicle operative with said track circuit the combination of
- means operative with each of adjacent signal blocks for inducing said signal current in said one track rail, and
- means operative with said signal current inducing means for establishing a magnetic field flux around at least a portion of said one track rail, with said field flux being oriented substantially parallel to said plane such that said plane is in a null of said magnetic field flux.
In antenna apparatus for providing at least a minimum signal current level in each of adjacent signal blocks of a track circuit lying in a plane and operative to control a vehicle moving along said track circuit, the combination of
- first means operative with one of said adjacent signal blocks for providing at least said minimum signal current level in said one signal block and including a first magnetic flus coupling member for establishing a first magnetic field flux in relation to said one signal block and substantially parallel to said plane, and
- second means operative with another of said adjacent signal blocks for providing at least said minimum signal current level in said another signal block and including a second magnetic flux coupling member for establishing a second magnetic field flux in relation to said another signal block and substantially parallel to said plane.
Dependencies are inferred from the claim text.