Patent US4703261A successfully refreshed from Google Patents.
US4703261A
Expired / Lapsed
US
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Differential Hall-effect gear measure feeler
Assignee: Maag Gear Wheel and Machine Co Ltd
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Filing: 1984-12-11
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Granted: 1987-10-27
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Expires: 2004-12-11
Abstract
Abstract The measuring system of the gear measuring feeler contains, as a Hall-effect sensor, two Hall-effect sensor elements which are arranged in opposing relationship to each other in the magnetic field. The differential output signal of this dual Hall-effect sensor is processed in a matching circuit which is designed as a differential amplifier circuit, to yield a measuring voltage with respect to zero volt. This measuring voltage is twice as high as in the case where only one Hall-effect sensor element is used as the Hall-effect sensor. Furthermore, the matching circuit is of a simpler structure and the measurement is substantially more precise since there is not required any reference voltage source in the matching circuit.
Inventors
- 👤 Nikolaus Berchtold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:12
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/12; G01D5/14; G01D5/142; G01D5/145
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
202 words
A gear measuring feeler comprising: a housing; a feeler rod pivotably mounted in said housing and deflectable from a predetermined position; said feeler rod having a first end and a second end; a feeler probe provided at said first end of said feeler rod; a measuring system comprising two members which are movable relative to each other; one of said two members being supported at said second end of said feeler rod; said two members comprising means for generating a static magnetic field and a Hall-effect sensor; said Hall-effect sensor containing two Hall-effect sensor elements and having a differential output; said measuring system generating electrical signals proportional to the deflection of said feeler rod from said predetermined position thereof; a matching circuit operatively connected to said measuring system to receive and standardize said electrical signals and having an input side and an output side; and said matching circuit having said input side connected with said differential output of said Hall-effect sensor and containing a differential amplifier circuit which is mounted at said housing and which receives the sum of the absolute values of the output voltages generated by said two Hall-effect sensor elements and delivers at said output side a corrected signal.
Claim 2
Dependent Claim
202 words
A gear measuring feeler comprising: a housing; a feeler rod pivotably mounted in said housing and deflectable from a predetermined position; said feeler rod having a first end and a second end; a feeler probe provided at said first end of said feeler rod; a measuring system comprising two members which are movable relative to each other; one of said two members being supported at said second end of said feeler rod; said two members comprising means for generating a static magnetic field and a Hall-effect sensor; said Hall-effect sensor containing two Hall-effect sensor elements and having a differential output; said measuring system generating electrical signals proportional to the deflection of said feeler rod from said predetermined position thereof; a matching circuit operatively connected to said measuring system to receive and standardize said electrical signals and having an input side and an output side; and said matching circuit having said input side connected with said differential output of said Hall-effect sensor and containing a differential amplifier circuit which is mounted at said housing and which receives the sum of the absolute values of the output voltages generated by said two Hall-effect sensor elements and delivers at said output side a corrected signal.
Claim 3
Dependent Claim
31 words
The gear measuring feeler as defined in claim 1, wherein: said two Hall-effect sensor elements are spatially arranged in opposing relationship to each other with respect to said static magnetic field.
Claim 4
Dependent Claim
22 words
The gear measuring feeler as defined in claim 2, wherein: said two Hall-effect sensor elements constitute two separate, mechanically fixedly interconnected elements.
Claim 5
Dependent Claim
50 words
The gear measuring feeler as defined in claim 2, wherein: each one of said two Hall-effect sensor elements comprises a predetermined side thereof; and said two Hall-effect sensor elements possessing identical predetermined sides and said two Hall-effect sensor elements being secured to each other at said identical predetermined sides thereof.
Claim 6
Dependent Claim
29 words
The gear measuring feeler as defined in claim 1, wherein: said matching circuit contains an inverter circuit interconnecting one of said Hall-effect sensor elements and said differential amplifier circuit.
Claim 7
Dependent Claim
229 words
A gear measuring feeler comprising: a housing: a feeler rod pivotably mounted in said housing and deflectable from a predetermined position; said feeler rod having a first end and a second end; a feeler probe provided at said first end of said feeler rod; a measuring system comprising two members which are movable relative to each other; one of said two members being supported at said second end of said feeler rod; said two members comprising means for generating a static magnetic field and a Hall-effect sensor; said Hall-effect sensor containing two Hall-effect sensor elements and having a differential output for delivering a differential output signal; said measuring system generating electrical signals proportional to the deflection of said feeler rod from said predetermined position thereof; a matching circuit operatively connected to said measuring system to receive and standardize said electrical signals and having an input side and an output side; said matching circuit being devoid of a reference voltage source; and said matching circuit having said input side connected with said differential output of said Hall-effect sensor and containing a differential amplifier circuit which is mounted at said housing and which received the sum of the absolute values of the output voltages generated by said two Hall-effect sensor elements and delivers at said output side an output signal substantially corresponding to said differential output signal of the Hall-effect sensor.
Claim 8
Dependent Claim
229 words
A gear measuring feeler comprising: a housing: a feeler rod pivotably mounted in said housing and deflectable from a predetermined position; said feeler rod having a first end and a second end; a feeler probe provided at said first end of said feeler rod; a measuring system comprising two members which are movable relative to each other; one of said two members being supported at said second end of said feeler rod; said two members comprising means for generating a static magnetic field and a Hall-effect sensor; said Hall-effect sensor containing two Hall-effect sensor elements and having a differential output for delivering a differential output signal; said measuring system generating electrical signals proportional to the deflection of said feeler rod from said predetermined position thereof; a matching circuit operatively connected to said measuring system to receive and standardize said electrical signals and having an input side and an output side; said matching circuit being devoid of a reference voltage source; and said matching circuit having said input side connected with said differential output of said Hall-effect sensor and containing a differential amplifier circuit which is mounted at said housing and which received the sum of the absolute values of the output voltages generated by said two Hall-effect sensor elements and delivers at said output side an output signal substantially corresponding to said differential output signal of the Hall-effect sensor.
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) | 1990-10-26 | 1991-04-27 | 1991-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-26 | 1995-04-27 | 1995-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-26 | 1999-04-27 | 1999-10-27 | $7700.00 | Window Closed / Lapsed |