Method of driving door of automatic door assembly
AssigneeYoshida Kogyo K.K.
InventorMasaaki Ogishi
Life of this patent
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Abstract
A method of driving a door of an automatic door assembly by a linear motor mounted within the automatic door assembly. The method comprises the steps of driving the door by a normal propulsion force of the linear motor and then driving the door by an added propulsion force which is greater than the normal propulsion force, at least during a final portion of the stroke of the door thereby overcoming the reaction force of cushioning devices provided near the ends of the door stroke.
Claims5
A method of using a linear motor for driving a door of an automatic door assembly of the type having a pair of cushioning devices for dampening the movement of the door at the ends of its opening and closing strokes, comprising the steps of:
- a. driving the door throughout the duration of each stroke by a normal constant propulsion force obtained from the linear motor;
- b. driving the door by an additional constant propulsion force, which produces a net force which is greater than said normal propulsion force, during a final portion of at least one of the strokes of the door for thereby overcoming a reaction force of one of the cushioning devices so as to bring the door completely to the end of said one of its strokes;
- and
- c. removing said additional propulsion force upon arrival of the door at said end.
Dependencies are inferred from the claim text.