US4600863A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for active vibration isolation
Assignee: CHAPLIN PATENTS HOLDING Co Inc A CORP OF
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Filing: 1983-04-19
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Granted: 1986-07-15
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Expires: 2003-04-19
Abstract
Abstract Vibration isolation between a source (1) and a mounting (3) is provided by means of a vibration-cancelling actuator (4a) with a shear isolator (5) placed in series with the source (1). Mechanical and magnetic actuators are disclosed, a preferred mechanical actuator including its own shear isolation with a ratio of compliance in shear and axial directions of at least 50:1.
Inventors
- 👤 George B. B. Chaplin
- 👤 Roderick A. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:47
CPC Classifications
F; F16; F16F; F16F15/00; F16F15/02; F16F15/023; F16F15/027; B; B63; B63H; B63H21/00; B63H21/30; B63H21/302; F16F13/00; F16F13/04; F16F13/06; F16F13/08; G; G10; G10K; G10K2210/00; G10K2210/10; G10K2210/121; G10K2210/128; G10K2210/129; G10K2210/30; G10K2210/321; G10K2210/3212
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
129 words
A method of reducing the transmission of vibration along a path leading from a source of vibration to a mounting of that source, which method comprises the employment of at least one vibration actuator and the energization of each actuator to reduce the effect of source-derived vibration on said mounting, the improvement which involves including shear decoupling means in the vibration path between the source of vibration and the mounting by forming each actuator as a volume of incompressible fluid defined in part by a peripheral containing wall which allows shear movements between the axial ends thereof but which is substantially resistant to radial expansion on a pressure rise within said volume, whereby the actuator has a much higher compliance in the transverse direction than in the axial direction.
Claim 2
Independent Claim
129 words
A method of reducing the transmission of vibration along a path leading from a source of vibration to a mounting of that source, which method comprises the employment of at least one vibration actuator and the energization of each actuator to reduce the effect of source-derived vibration on said mounting, the improvement which involves including shear decoupling means in the vibration path between the source of vibration and the mounting by forming each actuator as a volume of incompressible fluid defined in part by a peripheral containing wall which allows shear movements between the axial ends thereof but which is substantially resistant to radial expansion on a pressure rise within said volume, whereby the actuator has a much higher compliance in the transverse direction than in the axial direction.
Claim 3
Dependent Claim
27 words
A method as claimed in claim 1, in which the ratio of the compliance in the shear direction to the compliance in the axial direction exceeds 50:1.
Claim 4
Dependent Claim
33 words
A method as claimed in claim 1, in which the peripheral containing wall of the actuator comprises a highly compliant elastomeric material embedding a highly compliant helical spring of high tensile strength wire.
Claim 5
Dependent Claim
29 words
A method as claimed in claim 1, in which energization of the actuator is effected by means provided to alter the volume of imcompressible fluid constrained within the actuator.
Claim 6
Dependent Claim
27 words
A method as claimed in claim 1, characterised in that the peripheral containing wall is formed by an electro-viscous fluid solidified by an electric potential applied thereto.
Claim 7
Dependent Claim
31 words
A method as claimed in claim 5, characterised in that the radius of the peripheral containing wall can be varied by varying the electrodes to which the electric potential is applied.
Claim 8
Dependent Claim
83 words
Apparatus for reducing the transmission of vibration from a source of vibration to a mounting of the source, comprising support means linking the mounting to the source, a vibration actuator acting on the mounting and means to energise the vibration actuator so that source vibrations are attenuated in the support means, characterised in that the support means includes shear decoupling means having a ratio of compliances in one direction and in each of the two mutually orthogonal directions which is 1:at least 15.
Claim 9
Dependent Claim
83 words
Apparatus for reducing the transmission of vibration from a source of vibration to a mounting of the source, comprising support means linking the mounting to the source, a vibration actuator acting on the mounting and means to energise the vibration actuator so that source vibrations are attenuated in the support means, characterised in that the support means includes shear decoupling means having a ratio of compliances in one direction and in each of the two mutually orthogonal directions which is 1:at least 15.
Claim 10
Dependent Claim
81 words
A shear isolator comprising first and second rigid members spaced-apart by an elastomeric material characterised in that the elastomeric material comprises a peripheral containing wall reinforced by a helical spring, in that the volume within the wall between said first and second members is filled with an incompressible fluid, and in that the ratio between the compliance of said first member relative to said second in shear and in the axial direction of said peripheral containing wall is greater than 50:1.
Claim 11
Dependent Claim
81 words
A shear isolator comprising first and second rigid members spaced-apart by an elastomeric material characterised in that the elastomeric material comprises a peripheral containing wall reinforced by a helical spring, in that the volume within the wall between said first and second members is filled with an incompressible fluid, and in that the ratio between the compliance of said first member relative to said second in shear and in the axial direction of said peripheral containing wall is greater than 50:1.
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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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |