Patent US3754447A successfully refreshed from Google Patents.
US3754447A
Expired / Lapsed
US
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Wheel balancing apparatus
Assignee: Siemens Mobility Ltd
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Filing: 1971-06-01
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Granted: 1973-08-28
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Expires: 1991-06-01
Abstract
Abstract In an on-the-car wheel balancer the wheel suspension is supported upon a jacking support which includes a force transducer, the wheel is rotated and the fundamental of the electrical signal produced by the transducer or a signal related thereto in a given manner, is utilized to produce a strobing pulse and an out-of-balance weight indication. The fundamental due to wheel unbalance is cleared of noise due to suspension resonances by means of a tracking filter or preferably by means of a phase locking circuit which locks a multivibrator into the fundamental wheel frequency.
Inventors
- 👤 Smith B Turton
- 👤 T Clegg
- 👤 J Stevens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:34
CPC Classifications
G; G01; G01M; G01M1/00; G01M1/14; G01M1/16; G01M1/28
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
In wheel balancing apparatus including testing means for testing a rotating wheel for unbalance, said testing means including support means for providing rigid vertical support for a wheel mounting carrying a rotatably mounted wheel to be tested, force transducer means for producing a cyclic electrical signal related to wheel unbalance and circuit means for producing, responsive to the cyclic signal, an output signal waveform having a predetermined phase relationship to the fundamental frequency of the wheel unbalance related cyclic signal, the improvement comprising sampling means , connected to receive said output signal waveform and responsive to the frequency thereof, for sampling the output signal waveform when the frequency thereof lies within a predetermined sampling frequency band so as to produce an unbalance related control signal for enabling balancing of the wheel.
Claim 2
Dependent Claim
131 words
In wheel balancing apparatus including testing means for testing a rotating wheel for unbalance, said testing means including support means for providing rigid vertical support for a wheel mounting carrying a rotatably mounted wheel to be tested, force transducer means for producing a cyclic electrical signal related to wheel unbalance and circuit means for producing, responsive to the cyclic signal, an output signal waveform having a predetermined phase relationship to the fundamental frequency of the wheel unbalance related cyclic signal, the improvement comprising sampling means , connected to receive said output signal waveform and responsive to the frequency thereof, for sampling the output signal waveform when the frequency thereof lies within a predetermined sampling frequency band so as to produce an unbalance related control signal for enabling balancing of the wheel.
Claim 3
Dependent Claim
31 words
Wheel balancing apparatus as claimed in claim 1 wherein said circuit means includes a tracking filter operable in response to a said unbalance-related cyclic signal to produce said output signal waveform.
Claim 4
Dependent Claim
32 words
Wheel balancing apparatus as claimed in claim 1, wherein said circuit means includes a phase-locked oscillator circuit operable in response to a said unbalance-related cyclic signal to produce said output signal waveform.
Claim 5
Dependent Claim
17 words
Wheel balancing apparatus as claimed in claim 3 wherein said output signal waveform is of rectangular wave-shape.
Claim 6
Dependent Claim
27 words
Wheel balancing apparatus as claimed in claim 3, including means operable in response to given transitions in said output signal waveform to produce a strobing pulse waveform.
Claim 7
Dependent Claim
27 words
Wheel balancing apparatus as claimed in claim 5, including means responsive to the strobing pulse waveform for enabling an indication of instantaneous wheel position to be given.
Claim 8
Dependent Claim
19 words
Wheel balancing apparatus as claimed in claim 6, said indication being presented by means of an electrical flasher circuit.
Claim 9
Dependent Claim
29 words
Wheel balancing apparatus as claimed in claim 3 inlcuding weight indicator means responsive to the magnitude of a said cyclic signal for providing an indication of amount of unbalance.
Claim 10
Dependent Claim
17 words
Apparatus as claimed in claim 5 wherein the sampling means is gated by the strobe pulse waveform.
Claim 11
Dependent Claim
33 words
Wheel balancing apparatus as claimed in claim 9, further including holding means for holding the unbalance indication while the wheel speed is out of a speed band corresponding to said predetermined frequency band.
Claim 12
Dependent Claim
16 words
Wheel balancing apparatus as claimed in claim 1 wherein said force means comprises a piezo-electric transducer.
Claim 13
Dependent Claim
43 words
Wheel balancing apparatus as claimed in claim 8 including means for inhibiting indications produced by said indicator means in response to the wheel unbalance related cyclic signal, when the magnitude of a said unbalance related cyclic signal is less than a given value.
Claim 14
Dependent Claim
18 words
Wheel balancing apparatus as claimed in claim 1 wherein said sampling means samples at a predetermined sampling frequency.
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 |