Apparatus for providing an optimal opening and closing of a door

Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Starting and/or stopping

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Details

318328, 318463, 318603, H02P 158

Patent

active

044490780

ABSTRACT:
An apparatus for use in an automatic door system. Means are provided which compares the current position of the running door with a deceleration point to generate a low speed command upon their coincidence. A speed control responds to decelerate the door to a selected low speed. A measuring device measures a variable run-length of the door which is subject to variations in the mechanical condition of the door. In one embodiment, the device measures a low speed run-length over which the door has moved at a low speed. A comparator compares the measured low speed run-length with a preselected optimal low speed run-length to obtain error or departure from the optimal value. A correction logic produces an updated deceleration point by removing the error from the former deceleration point.

REFERENCES:
patent: 3343053 (1963-12-01), Toscano et al.
patent: 3416054 (1968-12-01), Galles
patent: 3443666 (1969-05-01), Abe et al.
patent: 3953776 (1974-12-01), Wolf
patent: 4312033 (1979-07-01), Sweeney et al.
patent: 4353019 (1980-07-01), Sweeney, Jr.

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