US3780573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniformity test machines
Assignee: Dunlop Ltd
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Filing: 1972-03-13
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Granted: 1973-12-25
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Expires: 1992-03-13
Abstract
Abstract Apparatus and a method for determining wheel/tire uniformity in which the wheel is rotatably mounted on one end of a support shaft and rotated under load against a moving surface. The support shaft is clamped in two spaced apart force-measuring devices each being sensitive in at least two directions which are perpendicular to one another and to the support shaft.
Inventors
- 👤 W Reus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:23
CPC Classifications
G; G01; G01M; G01M17/00; G01M17/007; G01M17/02; G01M17/022
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
93 words
Apparatus for determining uniformity of wheels particularly vehicle tires mounted on wheel rims comprising: a. a support shaft; b. a wheel rotatably mounted on one end of the support shaft; c. two force measuring devices, in which the support shaft is clamped, located adjacent to one another in spaced-apart relationship along the shaft, said devices being sensitive in at least two directions which are perpendicular to one another and to the support shaft; d. a movable surface against which the wheel is pressed; and e. means for moving the surface against the wheel.
Claim 2
Dependent Claim
93 words
Apparatus for determining uniformity of wheels particularly vehicle tires mounted on wheel rims comprising: a. a support shaft; b. a wheel rotatably mounted on one end of the support shaft; c. two force measuring devices, in which the support shaft is clamped, located adjacent to one another in spaced-apart relationship along the shaft, said devices being sensitive in at least two directions which are perpendicular to one another and to the support shaft; d. a movable surface against which the wheel is pressed; and e. means for moving the surface against the wheel.
Claim 3
Dependent Claim
43 words
Apparatus according to claim 1 including a calculating unit to which output signals from the two force measuring devices are led for separation of the forces and moments on said wheel in accordance with their direction, and an instrument for indicating such forces.
Claim 4
Dependent Claim
26 words
Apparatus according to claim 1, in which the force measuring devices comprise spring elements which allow only a very small deformation under the forces being measured.
Claim 5
Dependent Claim
26 words
Apparatus according to claim 1 in which at least one of the force measuring devices is sensitive to forces in the direction of the support shaft.
Claim 6
Dependent Claim
30 words
Apparatus according to claim 4 in which the one force measuring device measures the side force exerted by the wheel and is positioned as close to the wheel as possible.
Claim 7
Dependent Claim
28 words
Apparatus according to claim 5 in which the mutual spacing of the two force measuring devices is as a function of the inherent frequency of the measuring devices.
Claim 8
Dependent Claim
35 words
Apparatus according to claim 2 in which said calculating unit comprises means for the division and representation of the measured values, separated according to directions, of the forces and moments into static and dynamic portions.
Claim 9
Dependent Claim
48 words
Apparatus according to claim 1 in which the force measuring devices each comprise: a. a hub connected to said support shaft; b. a cross having measuring arms and extending from said hub; and c. a rigidly fixed support to which the extended end of said cross is connected.
Claim 10
Dependent Claim
23 words
Apparatus according to claim 8 in which at least one pair of diametrically opposed identical measuring arms is provided for each measuring direction.
Claim 11
Dependent Claim
54 words
Apparatus according to claim 9 in which said cross responds to forces in the direction of said support shaft and has two pairs of measuring arms which measure the forces in the direction of said support, said two pairs being arranged at 45* to measuring arms for each of the two other measuring directions.
Claim 12
Dependent Claim
41 words
Apparatus according to claim 8 in which all the measuring arms are connected to the rigidly fixed support via yielding springs, said yielding springs being rigid in the measuring direction on the pertinent measuring arm and pliant in the remaining directions.
Claim 13
Dependent Claim
42 words
Apparatus according to claim 11 further comprising a housing and a ring concentrically mounted about said hub, said measuring arms extending from said hub to said ring fastened in said housing, the yielding springs being arranged on the inside of said ring.
Claim 14
Dependent Claim
32 words
Apparatus according to claim 12 in which the yielding springs are obtained by formation of slots and recesses in the ring and by means of the cross-sectional dimensioning of the measuring arms.
Claim 15
Dependent Claim
28 words
Apparatus according to claim 8 in which each measuring arm is provided with measuring elements which comprise strips fastened to the measuring arms and responsive to bending stresses.
Claim 16
Dependent Claim
34 words
Apparatus according to claim 14 in which at least four measuring strips are mounted on the measuring arms provided for determining forces in one direction, the four strips being electrically connected as full bridges.
Claim 17
Dependent Claim
16 words
Apparatus according to claim 8 in which the hubs of the two crosses are braced together.
Claim 18
Independent Claim
68 words
A method of determining the uniformity of wheels comprising rotatably mounting a wheel on one end of a support shaft, holding the support shaft by two spaced apart force measuring devices each responsive at least to forces generated in two directions perpendicular to one another and to the shaft, rotating said wheel under load against a movable surface and measuring the forces generated in said force measuring devices.
Claim 19
Independent Claim
68 words
A method of determining the uniformity of wheels comprising rotatably mounting a wheel on one end of a support shaft, holding the support shaft by two spaced apart force measuring devices each responsive at least to forces generated in two directions perpendicular to one another and to the shaft, rotating said wheel under load against a movable surface and measuring the forces generated in said force measuring devices.
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) | 1976-12-24 | 1977-06-25 | 1977-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-24 | 1981-06-25 | 1981-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-24 | 1985-06-25 | 1985-12-25 | $7700.00 | Window Closed / Lapsed |