Patent US2967289A successfully refreshed from Google Patents.
US3672470A
Expired / Lapsed
US
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Photoelectric control for load handling device
Assignee: Eaton Corp
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Filing: 1969-11-26
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Granted: 1972-06-27
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Expires: 1989-11-26
Abstract
Abstract A load handling device carrying light sensitive means and a light source moves relatively to a load with a focused beam from the light source scanning the load. The light sensitive means receives light of said beam reflected from the load, and any variations of the reflected light because of variations in the load, will cause the light sensitive means to particularly condition a control circuit for the load handling device. By utilizing a light sensitive means such as two photoelectric cells, variations in ambient light do not significantly affect the operation of the light sensitive means and control circuit.
Inventors
- 👤 Frederick F Ohntrup
- 👤 Louis E Pecsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:06
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/0755; B65; B65G; B65G1/00; B65G1/02; B65G1/04; B65G1/0407; B65G1/0421; B66F9/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
188 words
In a combination of the class described, a load handling device, power means for moving said load handling device relatively to a load, light sensitive means for controlling said power means, a light source, focusing means whereby said load handling device effects the directing of light from said light source, in a defined coherent beam toward said load to scan said load as said load handling device moves relatively to said load, means positioning said light sensitive means to receive light from said light source reflected from said load as it is scanned incidental to the movement of said load handling device, said light sensitive means comprising two light sensitive elements spaced apart in the direction of travel of said load handling device so that each receives a portion of the light from said light source reflected by the load whereby variations in light so reflected by said load as said beam is interrupted by elements other than said load will affect the operation of said light sensitive means and the control of said power means by said light sensitive means independent of variation in ambient light conditions.
Claim 2
Dependent Claim
188 words
In a combination of the class described, a load handling device, power means for moving said load handling device relatively to a load, light sensitive means for controlling said power means, a light source, focusing means whereby said load handling device effects the directing of light from said light source, in a defined coherent beam toward said load to scan said load as said load handling device moves relatively to said load, means positioning said light sensitive means to receive light from said light source reflected from said load as it is scanned incidental to the movement of said load handling device, said light sensitive means comprising two light sensitive elements spaced apart in the direction of travel of said load handling device so that each receives a portion of the light from said light source reflected by the load whereby variations in light so reflected by said load as said beam is interrupted by elements other than said load will affect the operation of said light sensitive means and the control of said power means by said light sensitive means independent of variation in ambient light conditions.
Claim 3
Dependent Claim
18 words
In the combination of claim 1, the feature that said light source is on said load handling device.
Claim 4
Dependent Claim
20 words
In the combination of claim 2, the feature that said light sensitive means is also on said load handling device.
Claim 5
Dependent Claim
57 words
In the combination of claim 1, the feature that said light source and light sensitive means are in electrical circuit means, and means for controlling said electrical circuit means to render said light sensitive means inoperative when said load handling device is in particular parts of the path in which it is moved by said power means.
Claim 6
Dependent Claim
55 words
The combination of claim 1, in which said focusing means includes a first lens spaced from said light source to focus the beam emanating from said source against a load, and said load handling device further includes a second lens spaced from said light sensitive means to focus the beam reflected from said load thereon.
Claim 7
Dependent Claim
22 words
The combination of claim 1, in which said coherent beam is elongated in the direction of travel of said load handling device.
Claim 8
Dependent Claim
30 words
The combination of claim 5, including an apertured disc disposed between said second lens and said light sensitive means to further define said focused light beam reflected from said load.
Claim 9
Dependent Claim
36 words
The combination of claim 6, in which said light source comprises a lamp having a filament, and wherein the longitudinal axis of said filament is oriented in the direction of travel of said load handling device.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |