US4583081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Status indicator system for a radio-controlled door operator
Assignee: Motorola Solutions Inc
•
Filing: 1983-12-30
•
Granted: 1986-04-15
•
Expires: 2003-12-30
Abstract
Abstract A door operator system includes up and down limit switches actuated to the closed position when the door reaches the up and down travel limits. A processor circuit within the operator is connected to the limit switches for ascertaining the position of the door. Bias circuits apply a bias to the processor when the limit switches are open. An indicator system comprising a pair of light emitting diodes connected across respective limit switches indicates the door position. A series impedance element common to both LED circuits prevents actuation of the control circuit by the light emitting devices.
Inventors
- 👤 Charles J. Schmitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:32
CPC Classifications
G; G08; G08B; G08B21/00; G08B21/18; G08B5/00; G08B5/22; G08B5/36; E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/665; E05F15/668; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/106
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
88 words
A control system for use in conjunction with a door operator system having an up limit switch, a down limit switch, and a control circuit having input terminals connected to said limit switches, circuit means for applying a current bias to one of said input terminals while said respective limit switch is open, and indicator means including two visual indicators connected between said respective control input terminals and ground, each said indicator being illuminated when the associated limit switch is open to indicate the status of the door.
Claim 2
Dependent Claim
88 words
A control system for use in conjunction with a door operator system having an up limit switch, a down limit switch, and a control circuit having input terminals connected to said limit switches, circuit means for applying a current bias to one of said input terminals while said respective limit switch is open, and indicator means including two visual indicators connected between said respective control input terminals and ground, each said indicator being illuminated when the associated limit switch is open to indicate the status of the door.
Claim 3
Dependent Claim
27 words
A control system as defined in claim 1 wherein illumination of both visual indicators is an indication that said door is neither fully open nor fully closed.
Claim 4
Dependent Claim
32 words
A control system as defined in claim 1 wherein said bias circuit means comprise a source of unidirectional current and an impedance connected between said current source and said control input terminals.
Claim 5
Dependent Claim
33 words
A control system as defined in claim 1 wherein said indicator circuit includes in series with said visual indicator a series impedance element for preventing actuation of said control circuit by said indicator.
Claim 6
Dependent Claim
17 words
A control system as defined in claim 4 wherein said series impedance element comprises a series-connected diode.
Claim 7
Dependent Claim
16 words
A control system as defined in claim 1 wherein said visual indicators are light emitting diodes.
Claim 8
Dependent Claim
151 words
A control system for controlling the operation of an electric door operator, the system comprising: up limit switch means operatively associated with the door and actuated when the door reaches a fully up position; down limit switch means operatively associated with the door and actuated when the door reaches a fully down position; control circuit means including input terminals connected to respective ones of said up and down limit switches, said input terminals being biased by an applied unidirectional current whereby a logic low is applied to said input terminals upon actuation of said limit switches; up indicator means comprising a first visual indicator connected between said down limit switch and ground for indicating when said door is in a fully up position; and down indicator means comprising a second visual indicator connected between said up limit switch and ground for indicating when said door is in a fully down position.
Claim 9
Dependent Claim
151 words
A control system for controlling the operation of an electric door operator, the system comprising: up limit switch means operatively associated with the door and actuated when the door reaches a fully up position; down limit switch means operatively associated with the door and actuated when the door reaches a fully down position; control circuit means including input terminals connected to respective ones of said up and down limit switches, said input terminals being biased by an applied unidirectional current whereby a logic low is applied to said input terminals upon actuation of said limit switches; up indicator means comprising a first visual indicator connected between said down limit switch and ground for indicating when said door is in a fully up position; and down indicator means comprising a second visual indicator connected between said up limit switch and ground for indicating when said door is in a fully down position.
Claim 10
Dependent Claim
32 words
A control system as defined in claim 7 wherein said bias circuit means comprise a source of unidirectional current and an impedance connected between said current source and said control input terminal.
Claim 11
Dependent Claim
34 words
A control system as defined in claim 7 wherein said indicator circuit includes in series with each said visual indicator a series impedance element for preventing actuation of said control circuit by said indicator.
Claim 12
Dependent Claim
17 words
A control system as defined in claim 9 wherein said series impedance element comprises a series-connected diode.
Claim 13
Dependent Claim
16 words
A control system as defined in claim 7 wherein said visual indicators are light emitting diodes.
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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |