US3864967A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire load force variation testing system
Assignee: Electronic Associates Inc
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Filing: 1973-08-20
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Granted: 1975-02-11
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Expires: 1993-08-20
Abstract
Abstract A tire load force variation testing system for measuring force variation of a tire as a function of rotation. The force applied to the tire for testing is a high static load and a smaller varying force. A force transducer changes this force to an effective A.C. signal superimposed on a D.C. signal level. The resulting signal is applied to a multi-time constant lead filter to suppress the D.C. signal and amplify the A.C. signal. During test the D.C. signal may drift. The lead filter has at least two separate time constants 1) a fast time constant during filter loading, and 2) a slow time constant during tire test to permit tracking of any D.C. voltage drift that may occur.
Inventors
- 👤 Ronald W Krenzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:01
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/02; G01M17/022
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A tire load force variation system for measuring force variation of a tire as a function of rotation comprising: a. load cell means applied to said rotating tire for transducing a force to a voltage signal having a D.C. component and an effective A.C. voltage signal superimposed thereon; b. amplifier means connected in series to said load cell means for amplifying said voltage signal; c. filter means connected in series to said high gain amplifier means for eliminating noise from said amplified voltage signal; and d. lead filter means connected in series to said filter means for suppressing said D.C. component of said voltage signal said lead filter means including means for varying said filter time constant for compensating for drift of said D.C. component voltage signal during tire testing.
Claim 2
Dependent Claim
130 words
A tire load force variation system for measuring force variation of a tire as a function of rotation comprising: a. load cell means applied to said rotating tire for transducing a force to a voltage signal having a D.C. component and an effective A.C. voltage signal superimposed thereon; b. amplifier means connected in series to said load cell means for amplifying said voltage signal; c. filter means connected in series to said high gain amplifier means for eliminating noise from said amplified voltage signal; and d. lead filter means connected in series to said filter means for suppressing said D.C. component of said voltage signal said lead filter means including means for varying said filter time constant for compensating for drift of said D.C. component voltage signal during tire testing.
Claim 3
Dependent Claim
49 words
The time load force variation system as recited in claim 1 where said lead filter means includes amplifier means having first and second input terminals, said voltage signal being applied to said first input terminal; and integration means for generating a compensating signal connected to said second input terminal.
Claim 4
Dependent Claim
59 words
The tire load force variation system as recited in claim 2 including integration means connected to an output of said amplifier means and to said second input terminal for charging up to said D.C. component of said voltage signal, said integration amplifier means including time constant variation means for changing an initial time constant to a slower time constant.
Claim 5
Dependent Claim
40 words
The tire load force variation system as recited in claim 3 where said time constant variation means comprises a plurality of resistance means connected in parallel each to the other, said resistance means being switchable for varying said time constant.
Claim 6
Dependent Claim
33 words
The tire load force variation system as recited in claim 4 where said plurality of resistance means comprises a plurality of resistor elements, each of said resistor elements having a discrete resistance value.
Claim 7
Dependent Claim
31 words
The tire load force variation system as recited in claim 5 where each of said resistance values of each of said resistor elements is different each with respect to the other.
Claim 8
Dependent Claim
67 words
The tire load force variation system as recited in claim 4 where said time constant variation means includes: a. a first resistor having a resistance value substantially lower than any of said other plurality of resistance means; b. a first switch means connected in series to said first resistor; and, C. mode control means for turning on said first switch means to provide said initial time constant.
Claim 9
Dependent Claim
74 words
The tire load force variation system as recited in claim 4 where said time constant variation means includes: a. a first and second resistor element connected in parallel each to the other, said first resistor element having a resistance value substantially lower than said second resistor element; and b. a first switch means connected in series to said first resistor element for changing said time constant from an initial interval to a final interval.
Claim 10
Dependent Claim
103 words
The tire load force variation system as recited in claim 4 where said time constant variation means includes: a. a set of resistor elements comprising a first, second and third resistor element, said first resistor element having a resistance value substantially lower than said second resistor element, said second resistor element having a resistance value substantially lower than said third resistor element; and b. a set of switch means comprising a first and second switch connected in series to said first and second resistor elements respectively for changing said time constant from an initial interval to an intermediate interval to a final interval.
References Cited (Backward Citations)
US3490277A
Cited
US3500681A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-10 | 1978-08-12 | 1979-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-10 | 1982-08-12 | 1983-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-10 | 1986-08-12 | 1987-02-11 | $7700.00 | Window Closed / Lapsed |