Patent US3560752A successfully refreshed from Google Patents.
US3560752A
Expired / Lapsed
US
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Electrical-optical motion detector
Assignee: Venture Measurement Co LLC
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Filing: 1968-04-15
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Granted: 1971-02-02
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Expires: 1988-04-15
Abstract
Abstract Motion detection apparatus wherein the rotation of a motor shaft in a material level control causes sequential energization of a pair of photocell switches via a suitable light mask carried on the shaft and at a rate related to the velocity of the shaft. A first capacitor is connected to a power supply through one of the photocell switches and a second capacitor is connected to the first capacitor by the other photocell switch. The photocell switches progressively transfer electrical energy from a power supply to the first capacitor and then to the second capacitor which serves as the input for a silicon controlled rectifier controlling energization of the motor. When the motor shaft stops rotating or deviates from a predetermined rotational velocity, the progressive energy transfer ceases to thereby stop the motor.
Inventors
- 👤 Yee Lee
- 👤 Robert W Rauth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:08
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/226
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
199 words
In apparatus to sense velocity variations in the motion of an object, a source of electrical energy, first electrical energy storage means, first circuit means connected between said source and said storage means and including first switching meAns having a high impedance condition and a low impedance condition and operative when said first switching means is in one of said conditions to transfer electrical energy from said source to said storage means, output means having an input circuit, and second circuit means connected between said storage means and said input circuit and including second switching means having a high impedance condition and a low impedance condition and operative in one of said conditions to transfer energy from said storage means to said input circuit, and actuating means responsive to motion of said object to sequentially actuate said first switching means to said one impedance condition and then actuate said second switching means to said one impedance condition and then actuate said second switching means to said one impedance condition so that energy is progressively transferred from said source to said storage device and then from the storage device to the input circuit in response to motion of said object.
Claim 2
Dependent Claim
199 words
In apparatus to sense velocity variations in the motion of an object, a source of electrical energy, first electrical energy storage means, first circuit means connected between said source and said storage means and including first switching meAns having a high impedance condition and a low impedance condition and operative when said first switching means is in one of said conditions to transfer electrical energy from said source to said storage means, output means having an input circuit, and second circuit means connected between said storage means and said input circuit and including second switching means having a high impedance condition and a low impedance condition and operative in one of said conditions to transfer energy from said storage means to said input circuit, and actuating means responsive to motion of said object to sequentially actuate said first switching means to said one impedance condition and then actuate said second switching means to said one impedance condition and then actuate said second switching means to said one impedance condition so that energy is progressively transferred from said source to said storage device and then from the storage device to the input circuit in response to motion of said object.
Claim 3
Dependent Claim
74 words
The apparatus set forth in claim 1 wherein said first and said second switching means are responsive to light variations to switch between the high and low impedance conditions and said actuating means includes light source means and light transfer means responsive to relative motion of said light source means and said object to transfer light from said light source means sequentially to said first switching means and then to said second switching means.
Claim 4
Dependent Claim
76 words
The apparatus set forth in claim 2 wherein said light source means is stationary relative to said object and said light transfer means includes light masking means mounted on said object for comovement therewith and having light pervious and impervious portions arranged in a pattern so that light from said source means irradiates said first switching means and then light from said source irradiates said second switching means in response to motion of said masking means.
Claim 5
Dependent Claim
59 words
The apparatus set forth in claim 3 wherein said light responsive means are spaced apart in the direction of the the motion of said masking means and said light pervious portions of said masking means are a arranged and disposed so that light from said source means doe not simultaneously irradiate said first said and said second switching means.
Claim 6
Dependent Claim
95 words
The apparatus set forth in claim 4 wherein said object is a rotatable shaft, said light masking means comprises an opaque disc having a light transmitting aperture therethrough and being mounted on said shaft for corotation therewith, said light source means being disposed at one face of said disc, and said switching means comprises a pair of photocells operatively disposed at an opposite face of said disc and aligned with said light source means and said aperture to receive light from said light source means passing through said aperture when said shaft rotates said disc.
Claim 7
Dependent Claim
16 words
The apertures set forth in claim 1 wherein said storage means is a capacitive reactance means.
Claim 8
Dependent Claim
54 words
The apparatus set forth in claim 6 wherein the source is a direct current source having a pair of output terminals, said capacitive reactance means is connected in series with said first switching means across said terminals, and said second circuit means is connected across said capacitive reactance means through said second switching means.
Claim 9
Dependent Claim
55 words
The apparatus forth in claim 7 wherein said second circuit means further comprises a second capacitive reactance means connected in series with said second switching means across said first capacitive reactance means and said output means further comprises an electron control device having a pair of input electrodes connected across said second capacitive reactance means.
Claim 10
Dependent Claim
30 words
The apparatus set forth in claim 8 wherein an impedance is connected in parallel with said second capacitive reactance means to discharge said capacitive reactance means at a predetermined rate.
Claim 11
Dependent Claim
177 words
The apparatus set forth in claim 1 wherein said source comprises an alternating current source, said first circUit means comprises rectifier means having a pair of output terminals and operative to develop a direct current output across said terminals, said first switching means comprises a photocell having a first terminal connected to one of said output terminals, said first storage device comprises a first capacitor having a first terminal connected to a second terminal of said photocell and a second terminal of said capacitor being connected to the other of said rectifier output terminals, said second switching means comprises a second photocell having a first terminal connected to said first terminal of said first capacitor, said second circuit means further comprises a second capacitor having a first terminal connected to a second terminal of the second photocell, said second capacitor further having a second terminal connected to said other output terminal of said rectifier, an impedance means connected in parallel with said second capacitor and a controlled rectifier having a control electrode biased by said impedance means.
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |