Patent US2752588A successfully refreshed from Google Patents.
US3599048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lighting control system
Assignee: Individual
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Filing: 1970-04-23
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Granted: 1971-08-10
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Expires: 1990-04-23
Abstract
Abstract A control system comprising first circuit means including lightactuated means and first switch means cooperating to provide a first circuit condition in the presence of light and a second circuit condition in the absence of light, load switch means effective, when operated, to energize a load, second switch means connected in parallel with the said first switch means and effective, when operated, to bypass and disable the first switch means, and a timer. The timer, which may be a motor-driven, camoperated timer, includes timer control switch means and load control switch means. The control system is arranged so that, once the timer is started by the first circuit means changing from its first circuit condition to its second circuit condition, the load is energized and the second switch means is operated to bypass the first switch means so that changes in the electrical condition of the light-actuated means have no effect on the system.
Inventors
- 👤 Frank M Olin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:52
CPC Classifications
G; G04; G04C; G04C23/00; G04C23/14; G04C23/34; G04C23/36; H; H05; H05B; H05B39/00; H05B39/04; H05B39/041; H05B39/042; H05B47/00; H05B47/10; H05B47/105; H05B47/11; Y; Y02; Y02B; Y02B20/00; Y02B20/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
248 words
A control system comprising first circuit means including light-actuated means and first switch means cooperating to provide a first circuit condition in the presence of light and a second circuit condition in the absence of light, load switch means effective, when opErated, to energize a load, second switch means connected in parallel with said first switch means and effective, when operated, to bypass said first switch means, and a timer including timer control switch means and load control switch means, said timer control switch means having a running condition effective directly to energize and operate said timer from a power source for a first predetermined period of time and an alternate starting condition effective to energize and initiate operation of said timer through said first switch means and said second switch means, and said load control switch means having a condition effective to operate said load switch means and said second switch means for a second predetermined period of time running during and within the time span of said first period of time and an alternate condition effective to disable said load switch means and said second switch means, said timer being arranged so that, when said timer control switch means is in its said alternate starting condition, said load control switch means is in its first said condition, said second switch means being connected to and operated by said first switch means, and said load switch means being connected to and operated through said second switch means.
Claim 2
Dependent Claim
248 words
A control system comprising first circuit means including light-actuated means and first switch means cooperating to provide a first circuit condition in the presence of light and a second circuit condition in the absence of light, load switch means effective, when opErated, to energize a load, second switch means connected in parallel with said first switch means and effective, when operated, to bypass said first switch means, and a timer including timer control switch means and load control switch means, said timer control switch means having a running condition effective directly to energize and operate said timer from a power source for a first predetermined period of time and an alternate starting condition effective to energize and initiate operation of said timer through said first switch means and said second switch means, and said load control switch means having a condition effective to operate said load switch means and said second switch means for a second predetermined period of time running during and within the time span of said first period of time and an alternate condition effective to disable said load switch means and said second switch means, said timer being arranged so that, when said timer control switch means is in its said alternate starting condition, said load control switch means is in its first said condition, said second switch means being connected to and operated by said first switch means, and said load switch means being connected to and operated through said second switch means.
Claim 3
Dependent Claim
55 words
The invention of claim 1 in which said first switch means is conducting during such second circuit condition and nonconducting during such first circuit condition, whereby said timer is started when said timer control switch means is in its starting condition and said first circuit means changes from its first condition to its second condition.
Claim 4
Dependent Claim
56 words
The invention of claim 1 in which said timer includes a constant speed motor and first and second cams operating, respectively, said timer control switch means and load control switch means, said cams being driven by said motor, said first cam having a peripherally narrow portion establishing said starting condition of said timer control switch means.
Claim 5
Dependent Claim
119 words
The invention of claim 3 in which said second cam has a first peripherally extending lobe portion establishing said first-mentioned condition of said load control switch means and a second peripherally extending lobe portion establishing said alternate condition of said load control switch means, said first lobe portion being positioned so that said first-mentioned condition exists when said timer control switch means is in its said starting condition, and in which said first switch means is conducting during such second circuit condition and nonconducting during such first circuit condition, whereby said timer is started when said timer control switch means is in its starting condition and said first circuit means changes from its first condition to its second condition.
Claim 6
Dependent Claim
85 words
The invention of claim 4 in which said first switch means includes a relay, the field coil of which is energized by current flow through said light-actuated means in the presence of light, and a contact member spring urged normally closed in opposition to said field coil, whereby, when said first circuit means changes from its first condition to its second condition, said contact member is closed to start said timer and to initiate operation of said load switch means and said second switch means.
Claim 7
Dependent Claim
57 words
The invention of claim 5 in which said light-actuated device includes a photocell having a light-responsive surface, and including a hollow open-ended tube, said photocell being selectively adjustably axially movable within said tube with its light-responsive surface facing said open end, whereby the sensitivity of said system relative to changes in light density can be selectively adjusted.
Claim 8
Dependent Claim
13 words
The invention of claim 6 in which said tube is generally horizontally extending.
Claim 9
Dependent Claim
57 words
The invention of claim 1 in which said light-actuated device includes a photocell having a light-responsive surface, and including a hollow open-ended tube, said photocell being selectively adjustably axially movable within said tube with its light-responsive surface facinG said open end, whereby the sensitivity of said system relative to changes in light density can be selectively adjusted.
Claim 10
Dependent Claim
39 words
The invention of claim 7 in which said photocell and said tube are generally cylindrical in cross section and including at least one rubberlike ring peripherally attached to said photocell and frictionally engaging the internal wall of said tube.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |