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US4940914A
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US
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Vibration absorbing apparatus
Assignee: Bridgestone Corp
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Filing: 1988-05-16
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Granted: 1990-07-10
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Expires: 2008-05-16
Abstract
Abstract A vibration absorbing apparatus for reducing vibrations of a vibration damping objective comprises a vibration member excited by a piezo-ceramic element. The voltage applied to the piezo-ceramic element is controlled in accordance with the vibration state of the objective.
Inventors
- 👤 Keiichiro Mizuno
- 👤 Kazuyoshi Iida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:06
CPC Classifications
G; G12; G12B; G12B3/00; G12B3/08; F; F16; F16F; F16F15/00; F16F15/005
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A vibration absorbing apparatus for absorbing vibrations of a vibration damping objective, comprising: a support member attached to said vibration damping objective and having a plurality of notches formed therein; a plurality of vibration members fitted in said notches of said support member, said vibration members being of different lengths; a plurality of piezo-ceramic elements each attached to a base of a respective one of said vibration members; detecting means for detecting movement of said vibration damping objective; and voltage applying means, responsive to said detecting means, for applying a voltage to the piezo-ceramic elements in accordance with the vibration state of the objective so as to induce vibrations in said vibration members and reduce an amplitude of vibrations of the objective.
Claim 2
Dependent Claim
122 words
A vibration absorbing apparatus for absorbing vibrations of a vibration damping objective, comprising: a support member attached to said vibration damping objective and having a plurality of notches formed therein; a plurality of vibration members fitted in said notches of said support member, said vibration members being of different lengths; a plurality of piezo-ceramic elements each attached to a base of a respective one of said vibration members; detecting means for detecting movement of said vibration damping objective; and voltage applying means, responsive to said detecting means, for applying a voltage to the piezo-ceramic elements in accordance with the vibration state of the objective so as to induce vibrations in said vibration members and reduce an amplitude of vibrations of the objective.
Claim 3
Dependent Claim
16 words
The vibration absorbing apparatus according to claim 1, wherein said vibration member includes an additional mass.
Claim 4
Dependent Claim
25 words
The vibration absorbing apparatus according claim 1, wherein said vibration member is composed of a band-like spring material made from a metal or a plastic.
Claim 5
Dependent Claim
23 words
The vibration absorbing apparatus according to claim 1, wherein said piezo-ceramic element is made from barium titanate, lead titanium zirconate or Rochelle salt.
Claim 6
Dependent Claim
33 words
The vibration absorbing apparatus according to claim 1, wherein said voltage applying means comprises a signal amplifier circuit, a waveform processor, and waveform generator, a phase control circuit and a power amplifier circuit.
Claim 7
Dependent Claim
27 words
The vibration absorbing apparatus according to claim 1, wherein said voltage applying means comprises a signal amplifier circuit, a phase control circuit and a power amplifier circuit.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-07-09 | 1994-01-08 | 1994-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-09 | 1998-01-08 | 1998-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-09 | 2002-01-08 | 2002-07-10 | $7700.00 | Window Closed / Lapsed |