Limit switch apparatus for hydraulic elevators

Details Limit switch apparatus for hydraulic elevators Limit switch apparatus for hydraulic elevators

1997-07-28

1999-01-26

Nappi, Robert

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific load support drive-means or its control

Includes control for power source of drive-means

187302, 187282, B66B 128

Patent

active

058641033

ABSTRACT:
An apparatus for generating function signals to an elevator controller for controlling an elevator car (1) at terminal landings in a building includes an upper cam (3) and a lower cam (4) for mounting on a wall (2a, 2b) in an elevator shaft (2) at a top landing and a bottom landing respectively, an upper switch (5) and a lower switch (8) for mounting on the elevator car and for connection to a source of electrical power (12) and an interface circuit (10) connected to the switches. The interface circuit (10) has a lower limit relay coil (16), an upper limit relay coil (27), normally closed up relay contact sets (17,19,35) and normally closed down relay contact sets (24,28,30) which cooperate with the switches (5,8) for generating upper and lower limit function signals to control car travel and upper and lower slow down signals to control car speed.

REFERENCES:
patent: 1169722 (1916-01-01), Jansson
patent: 4127843 (1978-11-01), Anzai et al.
patent: 4775032 (1988-10-01), Peelle, III
patent: 4787481 (1988-11-01), Farrar et al.

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