Safety auxiliary apparatus for automatic door assembly

Details Safety auxiliary apparatus for automatic door assembly Safety auxiliary apparatus for automatic door assembly

1997-10-28

1999-12-07

Redman, Jerry

Movable or removable closures

Safety means responsive to obstruction to closure

49 28, E05F 1502

Patent

active

05996281&

ABSTRACT:
A safety auxiliary apparatus for an automatic door assembly includes a single door or first and second doors slidable along a predetermined track for selectively opening and closing the doorway, first and second mutually confronting closure faces being defined by said first and second doors or said single door in cooperation with a brace. A casing accommodating therein a light emitting element for emitting a beam for detection of an object and a light receiving element for receiving the beam from the light emitting element is mounted in a longitudinal frame member of the doors or said brace that define respectively said closure faces, so that an optical path can be defined between said closure faces so as to extend from the light emitting element to the light receiving element.

REFERENCES:
patent: Re30719 (1981-08-01), Mills
patent: 3609914 (1971-10-01), Berl
patent: 4452009 (1984-06-01), Baumeler et al.
patent: 4621452 (1986-11-01), Deeg
patent: 4706227 (1987-11-01), DuVall et al.
patent: 4866881 (1989-09-01), Morrow et al.
patent: 4914859 (1990-04-01), Gionet et al.
patent: 5581944 (1996-12-01), Kornbrekke et al.

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