Method of driving door of automatic door assembly

• US 4,090,113 A
• Filed: 06/10/1976
• Issued: 05/16/1978
• Est. Priority Date: 06/10/1975
• Status: Expired due to Term

• Current Assignee: YKK Corporation
• Original Assignee: Yoshida Kogyo K.K.
• Inventors: Ogishi, Masaaki
• Primary Examiner(s): Schaefer, Robert K.
• Assistant Examiner(s): Mutter, Michael K.
• Application Number:
  US05/694,607
• Time in Patent Office: 705 Days
• Field of Search: 49/360, 310/13, 318/282, 318/626, 318/135, 318/446, 318/466-469
• US Class Current: 318/282
• CPC Class Codes: E05F 15/60 using electrical actuators
• CPC Class Codes: E05Y 2900/132 Doors

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 at least a normal propulsion force of the linear motor, driving the door by a propulsion force which may range from zero to nearly the normal propulsion force, and then driving the door by the normal force again thereby reducing the speed of travel of the door during its opening and closing intervals.

Claims

1. A method of driving an electric door motor of an automatic door assembly, comprising the steps of:

(a) driving the motor by at least a normal operating voltage during an initial period of the stroke of the door;

(b) reducing said voltage to a level below said normal operating voltage after the lapse of said initial period of the door stroke to reduce the moving-force applied to the door;

(c) restoring and maintaining at least the normal operating voltage for the time needed to drive the door to the end of its stroke; and

(d) thereafter, removing said voltage.