US4171641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for measuring uniformity of tires
Assignee: UG Licensing Services Inc
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Filing: 1978-07-13
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Granted: 1979-10-23
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Expires: 1998-07-13
Abstract
Abstract Tire uniformity measuring method wherein imbalanced forces are measured and then removed from the final forces produced by a high-speed tire to give a final readout of forces which are the true dynamic road wheel contact forces on a tire under load.
Inventors
- 👤 Clifford A. Landsness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:11
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/02; G01M17/022; G01L; G01L5/00; G01L5/16; G01L5/161; G01L5/1627
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
75 words
A method of determining the uniformity of wheels comprising the steps of mounting a wheel on a rotatable rim, rotating said wheel to a predetermined speed, measuring the imbalance forces on said wheel without load thereon, thence rotating said wheel at said predetermined speed under a predetermined load, measuring the force variance on said wheel under said predetermined load and speed, subtracting said imbalance forces from said force variance to give a resultant contact force.
Claim 2
Independent Claim
75 words
A method of determining the uniformity of wheels comprising the steps of mounting a wheel on a rotatable rim, rotating said wheel to a predetermined speed, measuring the imbalance forces on said wheel without load thereon, thence rotating said wheel at said predetermined speed under a predetermined load, measuring the force variance on said wheel under said predetermined load and speed, subtracting said imbalance forces from said force variance to give a resultant contact force.
Claim 3
Dependent Claim
33 words
A method of determining the uniformity of wheels as set forth in claim 1 wherein said predetermined speed can be in a range from 35 miles per hour to 100 miles per hour.
Claim 4
Independent Claim
119 words
A method of determining the uniformity of a rotary body comprising the steps of rotating said body at a predetermined speed, measuring the incremental imbalance forces on said tire as a function of one revolution of said body to give a first signal, thence rotating said body at said predetermined speed and at a predetermined load thereon, measuring the force variance incrementally on said body as a function of one revolution of said body to give a second signal that is in synchronism with said first signal, and subtracting said first signal from said second signal to give a resultant dynamic contact force measurement for said wheel that represents the road contact forces on said rotary body under load.
Claim 5
Independent Claim
119 words
A method of determining the uniformity of a rotary body comprising the steps of rotating said body at a predetermined speed, measuring the incremental imbalance forces on said tire as a function of one revolution of said body to give a first signal, thence rotating said body at said predetermined speed and at a predetermined load thereon, measuring the force variance incrementally on said body as a function of one revolution of said body to give a second signal that is in synchronism with said first signal, and subtracting said first signal from said second signal to give a resultant dynamic contact force measurement for said wheel that represents the road contact forces on said rotary body under load.
Claim 6
Dependent Claim
26 words
A method of determining the uniformity of said rotary body as set forth in claim 3 wherein said predetermined speed is above five miles per hour.
Claim 7
Dependent Claim
35 words
A method of determining the uniformity of said rotary body as set forth in claim 4 wherein said imbalance force is a nonlinear force due to centrifugal force of imbalance as a function of time.
Claim 8
Dependent Claim
25 words
A method of determining the uniformity of said rotary body as set forth in claim 5 wherein said predetermined load is above one thousand pounds.
Claim 9
Independent Claim
132 words
A method of determining the uniformity of a rotary body comprising the steps of: rotating said body at a predetermined speed without load; producing by strain gauges coupled to said rotary body a first signal having an amplitude which varies as a function of the imbalance in said rotary body; rotating said body at said predetermined speed and at a predetermined load; in synchronism with the speed and location of said first signal; producing by strain gauges coupled to said rotary body a second signal having an amplitude which varies as a function of the force variance of said rotating body; and subtracting said first signal from said second signal to give a resultant contact force that reflects the true nonuniformity forces of said rotating body as it traverses the road surface.
Claim 10
Independent Claim
132 words
A method of determining the uniformity of a rotary body comprising the steps of: rotating said body at a predetermined speed without load; producing by strain gauges coupled to said rotary body a first signal having an amplitude which varies as a function of the imbalance in said rotary body; rotating said body at said predetermined speed and at a predetermined load; in synchronism with the speed and location of said first signal; producing by strain gauges coupled to said rotary body a second signal having an amplitude which varies as a function of the force variance of said rotating body; and subtracting said first signal from said second signal to give a resultant contact force that reflects the true nonuniformity forces of said rotating body as it traverses the road surface.
Claim 11
Dependent Claim
34 words
A method of determining the uniformity of a rotary body as set forth in claim 7 wherein said first and second signals are in synchronism to reflect the corresponding locations on said rotary body.
Claim 12
Dependent Claim
31 words
A method of determining the uniformity of a rotary body as set forth in claim 8 wherein each of said signals is taken over one full revolution of said rotating body.
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) | 1982-10-22 | 1983-04-23 | 1983-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-10-22 | 1987-04-23 | 1987-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-10-22 | 1991-04-23 | 1991-10-23 | $7700.00 | Window Closed / Lapsed |