Patent EP0455509A1 successfully refreshed from Google Patents.
US4090113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of driving door of automatic door assembly
Assignee: YKK Corp
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Filing: 1976-06-10
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Granted: 1978-05-16
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Expires: 1996-06-10
Abstract
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.
Inventors
- 👤 Masaaki Ogishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:00
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/132
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
99 words
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.
Claim 2
Independent Claim
99 words
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.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |