US3739832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overhead grille
Assignee: NORTH AMERICAN W-D DOOR Inc A CORP OF OH
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Filing: 1972-01-10
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Granted: 1973-06-19
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Expires: 1992-01-10
Abstract
Abstract A motor operated overhead grille in which the motor, when powering the grille in descent, also loads a spring of an emergency grille-opening means which spring, when called upon to do so, is thus effective in raising the grille sufficiently to provide an emergency escape or exit opening beneath the grille.
Inventors
- 👤 B Sivin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:23
CPC Classifications
E; E06; E06B; E06B9/00; E06B9/56; E06B9/60; E06B9/02; E06B9/08; E06B9/18; E06B9/68; E06B9/70
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
282 words
The combination with an overhead grille of a spring-operated emergency grille-opening means, said overhead grille comprising a horizontally oriented grille support having a hollow interior, a grille helically wrapped about the exterior of said grille support so as to partake of descending and ascending movements relative thereto in response to rotation of said grille support, and said spring-operated emergency grille-opening means comprising a spring support member disposed within said hollow interior of said grille support, a helical spring operatively arranged along said support member so as to urge said grille support through rotation in accordance with the biasing urgency thereof, a motor in normal driving relation with said grille support to power the same in rotation in one direction to cause ascending movement of said grille and in an opposite direction to cause descending movement of said grille and also to simultaneously cause the winding of said helical spring in a direction inducing a spring urgency therein opposing said grille descent, said driving relation of said motor and said grille support including a cooperating pair of driving and driven members, said driven member being selectively slidable between a first operative position drivingly engaged to said driving member and a second operative clearance position removed therefrom disengaging said grille support from said driving relation with said motor, and an emergency means including switch means effecTive upon actuation to urge said driven member into said second operative position, whereby in response to actuation of said emergency switch means following the descent of said grille said helical spring powers said grille support through rotation causing an extent of ascending movement in said grille which is sufficient to provide an emergency escape opening beneath said grille.
Claim 2
Dependent Claim
282 words
The combination with an overhead grille of a spring-operated emergency grille-opening means, said overhead grille comprising a horizontally oriented grille support having a hollow interior, a grille helically wrapped about the exterior of said grille support so as to partake of descending and ascending movements relative thereto in response to rotation of said grille support, and said spring-operated emergency grille-opening means comprising a spring support member disposed within said hollow interior of said grille support, a helical spring operatively arranged along said support member so as to urge said grille support through rotation in accordance with the biasing urgency thereof, a motor in normal driving relation with said grille support to power the same in rotation in one direction to cause ascending movement of said grille and in an opposite direction to cause descending movement of said grille and also to simultaneously cause the winding of said helical spring in a direction inducing a spring urgency therein opposing said grille descent, said driving relation of said motor and said grille support including a cooperating pair of driving and driven members, said driven member being selectively slidable between a first operative position drivingly engaged to said driving member and a second operative clearance position removed therefrom disengaging said grille support from said driving relation with said motor, and an emergency means including switch means effecTive upon actuation to urge said driven member into said second operative position, whereby in response to actuation of said emergency switch means following the descent of said grille said helical spring powers said grille support through rotation causing an extent of ascending movement in said grille which is sufficient to provide an emergency escape opening beneath said grille.
Claim 3
Dependent Claim
53 words
The combination as defined in claim 1 including a motor shaft for said motor, a sprocket slidably mounted on said motor shaft, and an endless chain entrained about said sprocket and said driven member to provide said driving relation between said motor and said grille support without inhibiting sliding movement of said sprocket.
Claim 4
Dependent Claim
59 words
The combination as defined in claim 1 wherein said switch is a toggle switch and said emergency means further includes a cable connected from said toggle switch to said driving member, whereby actuation of said toggle switch is effective to both urge said driving member through sliding movement and to hold the same in said resulting position of movement.
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) | 1976-06-18 | 1976-12-18 | 1977-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-18 | 1980-12-18 | 1981-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-18 | 1984-12-18 | 1985-06-19 | $7700.00 | Window Closed / Lapsed |