Elevator car door opening apparatus

摘要

An elevator car door opening and closing apparatus is taught having a clutch assembly carried by each car door for coupling with a landing door locking and unlocking assembly whereby the car and landing doors open and close simultaneously. The clutch assembly includes a mechanical expanding and collapsing parallelogram mechanism which engages, unlocks, and opens the landing door. Mechanical means is also disclosed whereby the elevator car doors may only be forced opened a limited amount if the car is stalled between landing sites.