04926974 is referenced by 16 patents and cites 21 patents.

An elevator car having a clutch pivotally carried by a car door and biased to an operative position in which drive rollers of an adjacent hatch door may be engaged by "open" and "close" vanes. A first parallelogram linkage operates the close vane in direct response to car door position, in a direction opposite to initial car door opening movement. A second parallelogram linkage, associated with the open vane, is operated when the open vane contacts a hatch door roller at the start of door opening, to unlock the car door by retracting a plunger from an opening in the car door sill. The car door clutch bias may be manually overcome by authorized maintenance personnel, to disengage the car door from a hatch door.

Title
Elevator car with improved car door clutch
Application Number
7/309629
Publication Number
4926974
Application Date
February 13, 1989
Publication Date
May 22, 1990
Inventor
Lawson Randall S
Gettysburg
PA, US
Karl B Orndorff
Bonneauville Boro, Adams County
PA, US
J Warren Barkell Jr
Penn Twp., Westmoreland County
PA, US
Richard H Pilsbury
Demarest
NJ, US
Daphne D Zurko
Pompton Lakes
NJ, US
Arnold M Morris
Chester Twp., Morris County
NJ, US
Agent
D R Lackey
Assignee
Inventio
CH
IPC
B66B 13/00
View Original Source