Movable or removable closures – Radiant energy control
Patent
1988-09-23
1990-04-10
Dorner, Kenneth J.
Movable or removable closures
Radiant energy control
49 26, E05F 1520
Patent
active
049148591
ABSTRACT:
Mechanism primarily suited to automatic sliding door applications wherein at least a pair of object presence sensing detectors, preferably of the ultra-sonic transducer type are arranged to be placed in linear spaced relation to one another effective to cast sonic beams produced thereby spanning the doorway to which applied. So as to assure satisfactorily a beam path to be intercepted by an object stationary or moving in the beams, they are purposely overlapped. The door upon being operatively moved by motion sensing detectors or manual means acts at different opening positions to switch the object sensing detectors on and upon reverse closing positions switches the object sensing detectors off.
REFERENCES:
patent: 3857466 (1974-12-01), Berkovitz et al.
patent: 3903996 (1975-09-01), Berkovitz
patent: 4297383 (1987-10-01), Hagiwara
Gionet Daniel C.
Nguyen Harry V.
Wikkerink Lance
Anderson Gerald A.
Dorner Kenneth J.
Lanson Electronics, Inc.
Monacelli Walter J.
Teagno Joseph R.
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