Apparatus for blocking elevator car travel

Details Apparatus for blocking elevator car travel Apparatus for blocking elevator car travel

1996-01-31

1998-03-17

Noland, Kenneth

Elevator, industrial lift truck, or stationary lift for vehicle

Having specific means contacting or on load support for...

Stationarily mounted and having disparate movable contact...

187414, B66B 516

Patent

active

057276579

ABSTRACT:
A travel blocking apparatus is mounted in an elevator shaft to block travel of an elevator car or a counterweight into a temporary working space such as, for example, an elevator shaft pit or head. One or more travel blocking devices selectively pivot into the travel path of the car or the counterweight to block further travel in the desired direction. During each travel of the car away from the protected area, the travel blocking devices are retracted and upon each stop of the car are tilted to the blocking position. These movements of the travel blocking devices are sensed by safety switches to continuously check the functional capability of the travel blocking apparatus. An unlatching and release device positioned above the shaft door must be actuated by a key to open the shaft door, whereby a memory circuit is actuated further interrupting safety circuits. The memory circuit must be reset by a key switch in the machine room in order for the elevator car to resume operation.

REFERENCES:
patent: 2726735 (1955-12-01), Rohnberg
patent: 3687237 (1972-08-01), Capra

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