US3619612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monitoring device for rotating systems
Assignee: Caterpillar Inc
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Filing: 1969-11-19
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Granted: 1971-11-09
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Expires: 1989-11-19
Abstract
Abstract A system for measuring physical properties of rotating devices and transmitting the measurements from the rotating member to an unconnected stationary circuit by means of electromagnetic waves having a frequency above 3 X 1012Hz.
Inventors
- 👤 William H Belke
- 👤 William E Dearlove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:07
CPC Classifications
G; G01; G01K; G01K1/00; G01K1/02; G01K1/024; G08; G08C; G08C23/00; G08C23/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
159 words
A monitoring device for rotating systems not requiring a physical connection to a rotating part being monitored comprising: sensing means disposed in the rotating part of the system to monitor a physical property thereof, said sensing means generating a first electrical signal proportional to said physical property monitoreD; electronic circuits disposed in said rotating part coupled to receive said first electrical signal and providing an output signal proportional thereto; a light-emitting diode disposed in said rotating part and coupled to said electronic circuits capable of varying the intensity of its electromagnetic radiation in response to said output signal, said radiation having a frequency of at least 3 X 1012Hz.; stationary radiation detecting means mounted to intercept said radiation from said light-emitting diode with circuits to convert it to a second electrical signal; and circuit means coupled to said stationary radiation detecting means for indicating the magnitude of said second electrical signal without a physical connection to said first signal.
Claim 2
Dependent Claim
159 words
A monitoring device for rotating systems not requiring a physical connection to a rotating part being monitored comprising: sensing means disposed in the rotating part of the system to monitor a physical property thereof, said sensing means generating a first electrical signal proportional to said physical property monitoreD; electronic circuits disposed in said rotating part coupled to receive said first electrical signal and providing an output signal proportional thereto; a light-emitting diode disposed in said rotating part and coupled to said electronic circuits capable of varying the intensity of its electromagnetic radiation in response to said output signal, said radiation having a frequency of at least 3 X 1012Hz.; stationary radiation detecting means mounted to intercept said radiation from said light-emitting diode with circuits to convert it to a second electrical signal; and circuit means coupled to said stationary radiation detecting means for indicating the magnitude of said second electrical signal without a physical connection to said first signal.
Claim 3
Dependent Claim
30 words
The monitoring device of claim 1 wherein said stationary detecting means comprises a solar cell disposed in close proximity to said light-emitting diode and oriented to intercept its infrared radiation.
Claim 4
Dependent Claim
34 words
The monitoring device of claim 1 wherein said sensing means comprises a strain gauge mounted on the rotating device, said strain gauge forming one leg of a bridge circuit connected to the electronic circuits.
Claim 5
Dependent Claim
58 words
The monitoring device of claim 1 wherein the rotating part includes an electrical power supply, said power supply comprising a plurality of solar cells mounted on said rotating part and an adjacent stationary source of electromagnetic radiation disposed to focus electromagnetic radiation on said solar cells to generate electrical energy without interference with emissions of the light-emitting diode.
Claim 6
Dependent Claim
56 words
The monitoring device of claim 4 wherein said rotating part includes a shaft end with an annular grooved disc bonded in a counterbore in said shaft end, said solar cells being disposed in said annular grooves with bonding means for filling the voids between adjacent solar cells and bonding them to the walls of said grooves.
Claim 7
Dependent Claim
17 words
The monitoring device of claim 5 wherein the light-emitting diode is mounted concentrically in the shaft end.
Claim 8
Dependent Claim
13 words
The measurement device of claim 6 wherein the diode is a gallium-arsenide diode.
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) | 1974-11-08 | 1975-05-10 | 1975-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-08 | 1979-05-10 | 1979-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-08 | 1983-05-10 | 1983-11-09 | $7700.00 | Window Closed / Lapsed |