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US3743853A
Expired / Lapsed
US
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Adjustable proximity sensor
Assignee: ELECTRO CORP AMERICA
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Filing: 1972-01-10
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Granted: 1973-07-03
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Expires: 1992-01-10
Abstract
Abstract An oscillatory proximity sensor which detects the presence of a conductor or metal adjacent the coil of an oscillator by virtue of the change in amplitude of the oscillations. The coil, oscillator and detector circuit are located within a probe housing mounted at the sensing location and the oscillator and detector utilize printed, integrated or hybrid circuitry. An adjustable core for the coil provides a sensitivity adjustment.
Inventors
- 👤 K Dittman
- 👤 S Skulpone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:43
CPC Classifications
H; H01; H01F; H01F5/00; G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/101; G01V3/102
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
112 words
In a proximity sensor having an oscillator with a tuned circuit, including a coil and detector means responsive to the amplitude of the oscillations for indicating the presence of metal in proximity to the coil, the improvement comprising: a bobbin with spaced end walls and an axial center opening therethrough, said coil being wound about said bobbin between the spaced end walls; a base secured to one end wall having a boss thereon with a threaded bore therethrough, said boss extending into the center opening of said bobbin; and a core threaded into said boss and adjustable in position therein with respect to the coil for varying the sensitivity of the sensor.
Claim 2
Dependent Claim
112 words
In a proximity sensor having an oscillator with a tuned circuit, including a coil and detector means responsive to the amplitude of the oscillations for indicating the presence of metal in proximity to the coil, the improvement comprising: a bobbin with spaced end walls and an axial center opening therethrough, said coil being wound about said bobbin between the spaced end walls; a base secured to one end wall having a boss thereon with a threaded bore therethrough, said boss extending into the center opening of said bobbin; and a core threaded into said boss and adjustable in position therein with respect to the coil for varying the sensitivity of the sensor.
Claim 3
Dependent Claim
101 words
In a proximity sensor having an oscillator with a tuned circuit, including a coil and detector means responsive to the amplitude of the oscillations for indicating the presence of metal in proximity to the coil, the improvement comprising: a bobbin with spaced end walls and a center opening therethrough, said coil being wound about said bobbin between the spaced end walls; a cup core of ferrite material having an annular channel in which said bobbin is received; and a core mounted to move relative to the coil within the center opening of said bobbin for varying the sensitivity of said sensor.
Claim 4
Dependent Claim
101 words
In a proximity sensor having an oscillator with a tuned circuit, including a coil and detector means responsive to the amplitude of the oscillations for indicating the presence of metal in proximity to the coil, the improvement comprising: a bobbin with spaced end walls and a center opening therethrough, said coil being wound about said bobbin between the spaced end walls; a cup core of ferrite material having an annular channel in which said bobbin is received; and a core mounted to move relative to the coil within the center opening of said bobbin for varying the sensitivity of said sensor.
Claim 5
Dependent Claim
28 words
The proximity sensor of claim 2 in which said cup core has an annular wall within said bobbin opening and said adjustable core extends within said annular wall.
Claim 6
Dependent Claim
44 words
The proximity sensor of claim 3 having a base secured to one end wall of said bobbin, said base having a boss with a threaded bore therethrough extending inside the annular wall of the cup core, said adjustable core being threaded into said boss.
Claim 7
Dependent Claim
36 words
The proximity sensor of claim 1 in which said bobbin is received within a cylindrical sleeve having a closed face, with the other end wall of said bobbin positioned against the inner surface of said face.
Claim 8
Dependent Claim
41 words
The proximity sensor of claim 5 in which said oscillator and detector means utilize semiconductor elements mounted on a circuit board, said circuit board being positioned within said sleeve and extending axially thereof from said one end wall of the bobbin.
References Cited (Backward Citations)
US3197658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-02 | 1977-01-01 | 1977-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-02 | 1981-01-01 | 1981-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-02 | 1985-01-01 | 1985-07-03 | $7700.00 | Window Closed / Lapsed |