Patent classifications
B
PERFORMING OPERATIONS; TRANSPORTING
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B66
HOISTING; LIFTING; HAULING
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B66B
ELEVATORS; ESCALATORS OR MOVING WALKWAYS
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13/00
Doors, gates, or other apparatus controlling access to, or exit from, cages or lift well landings
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B66B13/14
Control systems or devices
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B66B13/16
Door or gate locking devices controlled or primarily controlled by condition of cage, e.g. movement or position
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B66B13/18
without manually-operable devices for completing locking or unlocking of doors
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