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US4630808A
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US
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Vibration isolating devices
Assignee: Bridgestone Corp
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Filing: 1984-12-28
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Granted: 1986-12-23
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Expires: 2004-12-28
Abstract
Abstract A vibration isolating device is disclosed, which comprises a main vibration-absorbing body provided with a hollow chamber containing a vibration-damping liquid, and plural partition members each provided with a restricted passage to divide the hollow chamber into at least three small liquid chambers. In this device, one of the partition members is provided with a restricted passage having a sectional area larger than that of the restricted passage formed in the other remaining partition members.
Inventors
- 👤 Takao Ushijima
- 👤 Harumichi Yamazaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:38
CPC Classifications
F; F16; F16F; F16F13/00; F16F13/04; F16F13/06; F16F13/08; F16F13/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
163 words
A vibration isolating device comprising; two frame bodies for joining to a vibration source side on one hand and a vibrating side on the other hand, a vibration-absorbing body interposed between said two frame bodies and composed of an elastomeric material, a hollow chamber mainly defined by an inner wall face of said vibration-absorbing body and containing a vibration-damping liquid therein, and first and second partition members dividing said hollow chamber into first, second and third liquid chambers; said first liquid chamber being defined by wall faces including at least vibration-absorbing body and first partition member; said second liquid chamber being defined by all faces including at least first and second partition members; each of said two partition members being provided with a restricted passage establishing communication between the adjacent liquid chambers; said restricted passage in said first partition member having a sectional area larger than that in said second partition member; and said second liquid chamber being provided with a pressure-reducing means.
Claim 2
Dependent Claim
163 words
A vibration isolating device comprising; two frame bodies for joining to a vibration source side on one hand and a vibrating side on the other hand, a vibration-absorbing body interposed between said two frame bodies and composed of an elastomeric material, a hollow chamber mainly defined by an inner wall face of said vibration-absorbing body and containing a vibration-damping liquid therein, and first and second partition members dividing said hollow chamber into first, second and third liquid chambers; said first liquid chamber being defined by wall faces including at least vibration-absorbing body and first partition member; said second liquid chamber being defined by all faces including at least first and second partition members; each of said two partition members being provided with a restricted passage establishing communication between the adjacent liquid chambers; said restricted passage in said first partition member having a sectional area larger than that in said second partition member; and said second liquid chamber being provided with a pressure-reducing means.
Claim 3
Dependent Claim
60 words
The vibration isolating device according to claim 1, wherein one of the partition members being and provided with a first restricted passage having a sufficiently large diameter to prevent a choked condition, and the other partition member being provided with a second restricted passage having a small diameter and a long axial length as compared with said first restricted passage.
Claim 4
Dependent Claim
59 words
The vibration isolating device according to claim 1, wherein said first restricted passage satisfies the following relationships: D/D.sub.0 ≧1/3, and L/D.sup.2 ≦1/3, in which D is a diameter of said first restricted passage, L is a length of said first restricted passage and D 0 is an effective diameter of a liquid chamber located above said first restricted passage.
Claim 5
Dependent Claim
18 words
The vibration isolating device according to claim 1, wherein said pressure-reducing means comprises a movable second partition member.
Claim 6
Dependent Claim
23 words
The vibration isolating device according to claim 1, wherein said pressure-reducing means comprises, a portion of said wall face comprising an elastomeric material.
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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) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |