Controlling device for an automatic door

Details Controlling device for an automatic door Controlling device for an automatic door

1986-06-12

1987-10-06

Downey, Kenneth

Movable or removable closures

Radiant energy control

49 31, E05F 1520

Patent

active

046973834

ABSTRACT:
A controlling device for an automatic door which can detect a human body approaching the door assuredly in a relatively early stage and hence can assure smooth passage thereof by a person after another person has passed it. The controlling device comprises a controller, a first human body detecting sensor having a small detecting area near the door, and a second human body detecting sensor having a wider detecting area which extends remotely from the door and covers the detecting area of the first human body sensor. The controller develops a door opening signal in response to a human body detection signal received from the first human body detecting sensor when a door closing signal is not being developed from the controller whereas it develops a door opening signal in response to a human body detection signal from the second human body detecting sensor when a door closing signal is being developed from the controller. Thus, when the door is being closed, an opening signal is developed at an early stage, but normally an opening signal is developed at a later stage.

REFERENCES:
patent: 4577437 (1986-03-01), Gionet et al.

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