Doorway safety device

Details Doorway safety device Doorway safety device

1975-10-06

1977-06-14

Blunk, Evon C.

Elevator, industrial lift truck, or stationary lift for vehicle

Stationary lift for roadway vehicle or required component...

Having specific drive means for support

49 25, 340258B, B66B 1326

Patent

active

040291766

ABSTRACT:
A safety system for automatically operated sliding panel doors, specifically elevator doors, having acoustic wave transmitters and receivers arranged in a row along the moving door's leading edge. Short bursts of acoustic energy are projected both in front of the door and to one or both sides so as to "sweep" a three-dimensional space, in and near the door's path, representing a zone of potential danger to persons or objects therein. Reflected energy from persons or objects in the danger zone is usable if it is received, following each transmitted burst, during a prescribed time interval representing combinations of the doorway opening distance and other selected parameters, and usable reflections are converted to a control signal to stop and re-open the doors before they strike the endangered person or object.

REFERENCES:
patent: 2900521 (1959-08-01), Eames
patent: 3367450 (1968-02-01), Lester et al.
patent: 3627082 (1971-12-01), Berkovitz

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