US3781622A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic interlock for door operator
Assignee: Wayne Dalton Corp
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Filing: 1972-10-24
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Granted: 1973-12-25
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Expires: 1992-10-24
Abstract
Abstract An electrical control circuit for a door operator is provided having an electronic interlock. Doors or closures of the type for which this electrical control circuit and interlock are intended to be utilized are of a type known as a roll-up door having a plurality of hingedly interconnected slats or panels. This type of door may be opened through roll-up of the hinged slats. Closures of this type are often of a large physical size requiring electrically driven motors for operation. A control circuit is provided permitting selective operation of the electrical drive motor in the desired direction and mechanical locking means is usually provided to secure the closure in a closed provision relative to the opening. An interlock must be provided to prevent inadvertent operation when the mechanical lock is securing the closure in this closed position. The electrical control circuit of this invention incorporates an electronic interlock which prevents motor operation when the mechanical lock is engaged and prevents damage to the door operator and motor or permits operation with the mechanical lock disengaged.
Inventors
- 👤 F Acton
- 👤 P Cochran
- 👤 W Moore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:41
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05Y; E05Y2900/00; E05Y2900/10; E05Y2900/13; E05Y2900/146
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
157 words
In combination with a door selectively movable between a closed and an open position relative to a door frame, an electrically energized door operator drivingly coupled with the door for effecting movement thereof, and mechanical locking means releasably interengageable with the door and door frame to secure the door in a closed position relative to the frame; an electrical control circuit interconnected with the door operator to effect energization thereof comprising: first and second circuits alternatively energizeable to effect opening and closing of the door, respectively, when energized, electrical switch means interposed in said first circuit and which may be selectively placed in either an electrically conductive or non-conductive state to control energization of said first circuit, said switch means responsive to the mechanical locking means as to be maintained in a nonconductive state when the locking means is interengaged with the door and frame and which may become electrically conductive when the locking means is disengaged.
Claim 2
Dependent Claim
157 words
In combination with a door selectively movable between a closed and an open position relative to a door frame, an electrically energized door operator drivingly coupled with the door for effecting movement thereof, and mechanical locking means releasably interengageable with the door and door frame to secure the door in a closed position relative to the frame; an electrical control circuit interconnected with the door operator to effect energization thereof comprising: first and second circuits alternatively energizeable to effect opening and closing of the door, respectively, when energized, electrical switch means interposed in said first circuit and which may be selectively placed in either an electrically conductive or non-conductive state to control energization of said first circuit, said switch means responsive to the mechanical locking means as to be maintained in a nonconductive state when the locking means is interengaged with the door and frame and which may become electrically conductive when the locking means is disengaged.
Claim 3
Dependent Claim
51 words
The electrical control circuit of claim 1 in which said electrical switch means includes an electronic switching circuit having a first switch device series connected in said first circuit and a second switch device connected in circuit with said first switch device to control switching thereof between conductive and non-conductive states.
Claim 4
Dependent Claim
47 words
The electrical control circuit of claim 2 wherein said second switch device includes a first electrical contact electrically connected with said first switch device and a second electrical contact comprising a movable element of the mechanical locking means, said movable element interconnected in the electronic control circuit.
Claim 5
Dependent Claim
54 words
The electrical control circuit of claim 3 wherein said first switching device is a solid state switch having a gating terminal, an anode terminal and a cathode terminal whereby said solid state switch may be switched between condUcting and non-conducting states, said second switch device connected with said gating terminal and said cathode terminal.
Claim 6
Dependent Claim
20 words
The electrical control circuit of claim 4 having a gating circuit connected between said anode terminal and said gating terminal.
Claim 7
Dependent Claim
56 words
The electrical control circuit of claim 3 wherein said second switch is closed when said movable element is in a locking position maintaining said first switching device in a non-conducting state, said second switch is open when said movable element is in an unlocked position permitting said first switching device to switch to a conducting state.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |