Position sensor device for elevator car

Details Position sensor device for elevator car Position sensor device for elevator car

1977-03-07

1978-11-28

Trafton, David L.

Communications: electrical

Selective

Having indication or alarm

187 35, 187 39, 200 47, 307119, 318266, 318468, 340177VA, 340196, G08B 302

Patent

active

041278437

ABSTRACT:
A position sensor disposed on an elevator car has a first rotatable shaft connected to a secondary winding of a transformer or a switch actuating member, and a second rotatable shaft coaxial with the first shaft and connected to a primary transformer winding or to a switch position changing member. A first roller engages a rod-shaped cam mounted at an angle to a guide rail for the car toward the end of the path of travel of the car to rotate the first shaft in a direction to decrease the voltage across the secondary winding or successively actuate the switches. If the car moves horizontally, the first shaft is rotated to change the voltage and a second roller engaging the rail rotates a second shaft to compensate for this change in voltage.

REFERENCES:
patent: 1169722 (1916-01-01), Jansson
patent: 1949788 (1934-03-01), Dunn
patent: 2588299 (1952-03-01), Schultz
patent: 3333657 (1967-08-01), Inuzuka et al.
patent: 3697707 (1972-10-01), Williams

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