US3754358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for correcting non-uniformity in a rotating tire
Assignee: Uniroyal Goodrich Tire Co
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Filing: 1971-06-15
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Granted: 1973-08-28
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Expires: 1991-06-15
Abstract
Abstract The method for reducing the radial force variation of a rotating tire by grinding from the tread a portion thereof as determined by the radial motion of a floating load wheel which provides an electrical signal proportional to the movement of the load wheel axis. The electrical signal is employed in a circuit such that when a reference voltage is exceeded, the signal is effective to move a grinder to and away from contact with the tire tread in increments of constant radial depth but of varying time duration. A pulse is synchronized with the tire rotation so each pulse indicates a unit angle of tire rotation. A comparator conducts the pulses only when the signal exceeds a predetermined value such that the pulses activate alternately a pair of one-shot multivibrators which energize actuating solenoids for applying or retracting the grinder. The solenoids move a bell crank which causes a snap-action toggle to advance or retract the grinder with respect to the tire tread.
Inventors
- 👤 H Shively
- 👤 C Landsness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:17
CPC Classifications
G; G01; G01M; G01M1/00; G01M1/14; G01M1/16; G01M1/22; G01M1/225; B; B24; B24B; B24B49/00; B24B49/16; B24B49/165; B24B5/00; B24B5/36; B24B5/366; B29; B29D; B29D30/00; B29D30/06; B29D30/0601; B29D30/0633; G01M1/30; G01M1/34; G01M17/00; G01M17/007; G01M17/02; G01M17/022; G01M17/024; B29D2030/0634; B29D2030/0635; B29D2030/0638
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
151 words
The method of reducing the magnitude of radial force variation in a pneumatic tire comprising: a. inflating the tire and rotating it about its axis; b. providing an electrical signal, the amplitude and duration of which is representative of the radial force variation of the rotating tire; c. engaging the tread of the rotating tire to a predetermined depth under a force independent of force variations in said tire and in the locality productive of said signal with a means for removing rubber from the tread region in response to said signal; d. continuing the engagement of the material-removing means for that portion of a single revolution of the tire corresponding to the time in which said signal is in excess of a predetermined minimum; and, e. continuing rotation of the tire and operation of said material-removing means until the maximum radial force variation signal does not exceed said predetermined minimum.
Claim 2
Independent Claim
151 words
The method of reducing the magnitude of radial force variation in a pneumatic tire comprising: a. inflating the tire and rotating it about its axis; b. providing an electrical signal, the amplitude and duration of which is representative of the radial force variation of the rotating tire; c. engaging the tread of the rotating tire to a predetermined depth under a force independent of force variations in said tire and in the locality productive of said signal with a means for removing rubber from the tread region in response to said signal; d. continuing the engagement of the material-removing means for that portion of a single revolution of the tire corresponding to the time in which said signal is in excess of a predetermined minimum; and, e. continuing rotation of the tire and operation of said material-removing means until the maximum radial force variation signal does not exceed said predetermined minimum.
Claim 3
Dependent Claim
60 words
The method defined in claim 1 further comprising the steps of: a. providing a reference signal the voltage of which is representative of the said predetermined minimum of radial force variation; b. comparing said electrical signal with said referenCe signal; and c. permitting said electrical signal to be conducted only when same is greater in value than said reference signal.
Claim 4
Dependent Claim
80 words
The method defined in claim 1, further comprising the steps of: a. providing a series of equal duration direct current pulses which pulses are synchronized with the rotation of said tire such that each pulse represents a unit angle of tire rotation; b. providing an electrical gating means and applying said pulses and said electrical signal to the input of said gating means such that said electrical signal is passed only when said pulses are received by said gating means.
Claim 5
Dependent Claim
49 words
The method defined in claim 3 wherein: a. movement of said material-removing means into engagement with said tire is initiated by the first of said series of pulses; and b. movement of the material-removing means away from material-removing position is initiated by the last of said series of pulses.
Claim 6
Dependent Claim
45 words
The method defined in claim 1, further comprising preventing engagement of the tire with said means for removing material from the tread region until the amplitude of said electrical signal is in excess of a predetermined minimum and the duration exceeds a predetermined minimum time.
Claim 7
Dependent Claim
14 words
The method defined in claim 5 wherein said predetermined minimum duration is 30 milliseconds.
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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |