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Title: US3973746: Collision avoidance system
[ Derwent Title ]

Country: US United States of America

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12 pages

Inventor: Ball, Kenneth H.; Tarzana, CA

Assignee: Walt Disney Productions, Burbank, CA
other patents from WALT DISNEY PRODUCTIONS (617670) (approx. 22)
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Published / Filed: 1976-08-10 / 1975-05-02

Application Number: US1975000573847

IPC Code: Advanced: B61L 3/24;
Core: B61L 3/00;
IPC-7: B61L 3/10;
B61L 3/20;

ECLA Code: B61L3/24A;

U.S. Class: Current: 246/187.B; 104/297; 104/299; 246/034.R; 246/063.C;
Original: 246/187.B; 104/149; 246/034.R; 246/063.C;

Field of Search: 246/33 R,34 R,63 R,63 C,130 R,167 D,187 R,187 B,187 C,34 CT,122 R 340/023,171 R,171 A 104/149,152,153

Priority Number:
1975-05-02  US1975000573847

Abstract:     A collision avoidance system adapted for railroad use comprising a track having connected thereto a plurality of first signal transmitters exciting the track by a first control signal within a first frequency bandpass range and a plurality of second signal transmitters interspaced between the first signal transmitters in an alternating arrangement, such second transmitters exciting the track by a second control signal within a second frequency bandpass range. While the first and second control signals are respectively within the first and second bandpass range, individual ones thereof are separated by frequency increments from the other control signals within the corresponding bandpass range such that any beats therebetween are of a relatively high frequency. A train riding the track includes a front and rear pickup selectively connected to a dual frequency amplifier across a two-position switch where the amplifier, at its output, connects to a first and second bandpass filter respectively centered at the first and second frequency bandpass. The outputs of the respective filters are rectified and fed to corresponding comparators wherein the signals are compared against a preselected level. The outputs of the comparators are then combined in a logical AND circuit which, across a delay network having a long time constant in the direction of brake engagement and a short time constant in the direction of brake disengagement, operates the brakes of the train. Included also in the train, intermediate the front and rear pickups, is a shunt circuit including the motor of the train, whereby the control signals are attenuated. Thus, the next succeeding train will not receive the shunted control signals and will therefore engage the brakes.

Attorney, Agent or Firm: Fulwider, Patton, Rieber, Lee & Utecht ;

Primary / Asst. Examiners: Kunin, Stephen G.;

Family: None

First Claim:
Show all 15 claims
I claim:     1. A collision avoidance system adapted for use in a vehicle for propulsion between conduits emanating from an external source of electrical power, comprising:
  • a plurality of first and second wayside transmitters, each connected between said conduits, said transmitters superposing corresponding first and second alternating control signals respectively within corresponding first and second frequency bandpass ranges, said first transmitters being interposed between said second transmitters along said conduits;
  • shunt means disposed in said vehicle, including a traction motor, which receives both said electrical power and said first and second control signals;
  • pickup means disposed in said vehicle ahead of said shunt means for sensing said first and second control signals;
  • filter means operatively connected to said pickup means for discriminating between said first and second bandpass range and providing first and second output signals, respectively indicative of the amplitudes of said first and second control signals within said first and second bandpass range; and
  • control means operatively connected to receive said first and second output signals for stopping said vehicle when either one of said output signals falls below a preselected amplitude for a time period greater than a predetermined time period.

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Forward References: Show 5 U.S. patent(s) that reference this one

U.S. References: Go to Result Set: All U.S. references   |  Forward references (5)   |   Backward references (4)   |   Citation Link

Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 8pp US3035167* 1962-05 Luft    
Get PDF - 14pp US3303339* 1967-02 Dell    
Get PDF - 19pp US3355584  1967-11 Baughman   Train speed control system
Get PDF - 19pp US3794833  1974-02 Blazek et al.  Westinghouse Air Brake Company TRAIN SPEED CONTROL SYSTEM
  * some details unavailable
Foreign References: None

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