RAIL SIGNAL DISTURBANCE AVOIDANCE MEANS

• US 3,555,270 A
• Filed: 04/22/1968
• Issued: 01/12/1971
• Est. Priority Date: 04/26/1967
• Status: Expired due to Term

• Current Assignee: Erik Persson
• Original Assignee: Erik Persson
• Inventors: Persson, Erik
• Application Number:
  US04/723,060
• Time in Patent Office: 995 Days
• US Class Current: 246/194
• CPC Class Codes: B61L 3/221 using track circuits

Abstract

In electrically operated rail vehicles in which signals are inductively transmitted from rails to vehicle through coils applied in the vehicle, disturbances are avoided by pivoting said coil (preferably series-connected) to such an angle in relation to the plane of the rails that the resultant voltage from an asymmetrical current conductor is very low or zero. The same effect could also be accomplished by placing said coils horizontally and supplementing them by transverse coils.

Claims

1. Means for avoiding disturbances in the signal systems for electrically operated rail vehicles in which signals are inductively transmitted from rails to the vehicle through coils mounted in the vehicle, all said coils being positioned at an angle in relation to the plane of the rails of such a magnitude that currents in an asymmetrically placed current conductor do not induce any substantial resultant voltage in the coils.

2. Means according to claim 1 in which said coils are series-connected.

3. Means for avoiding disturbances in the signal system for electrically operated rail vehicles in which signals are inductively transmitted from rails to the vehicles through two main coils mounted in the vehicle, said coils being placed horizontally and two supplementary coils positioned at an angle to the horizontal plane in series with the main coils, said coils being arranged in two groups, each group comprising a main coil and an angularly positioned coil series-connected to each other.

4. Means according to claim 3 in which all said coils are series-connected.