Highway crossing bell apparatus

Details Highway crossing bell apparatus Highway crossing bell apparatus

1979-06-11

1981-03-10

Pitts, Harold I.

Communications: electrical

Audible indication

Percussion-type sound producer

340396, 340392, G10K 1065

Patent

active

042557445

ABSTRACT:
The bell clapper arm is mounted on the rotatable armature of a rotary solenoid so as to be moved through an arc, to strike the bell gong with a hammer at its outer end, each time the solenoid is energized. The solenoid energizing circuit includes the contacts of a reed relay switch which are periodically closed by a permanent magnet rotated in close proximity by a motor actuated when a bell warning is desired. The reed relay contacts are closed by the passage of each pole of the magnet and the ringing frequency is adjusted by varying the motor speed.

REFERENCES:
patent: 956250 (1910-04-01), Wilson
patent: 1117484 (1914-11-01), Dunham
patent: 1136781 (1915-04-01), Elliott
patent: 3689919 (1972-09-01), Ganter
patent: 3769870 (1973-11-01), Huber
patent: 3910225 (1975-10-01), Huber

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