WO2001006146A1 - Vibration isolating construction - Google Patents

Vibration isolating construction Download PDF

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Publication number
WO2001006146A1
WO2001006146A1 PCT/US2000/019254 US0019254W WO0106146A1 WO 2001006146 A1 WO2001006146 A1 WO 2001006146A1 US 0019254 W US0019254 W US 0019254W WO 0106146 A1 WO0106146 A1 WO 0106146A1
Authority
WO
WIPO (PCT)
Prior art keywords
vibration damping
damping structure
cuts
aperture
metal
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2000/019254
Other languages
French (fr)
Other versions
WO2001006146A8 (en
Inventor
Ahid Nashif
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Material Sciences Corp
Original Assignee
Material Sciences Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Material Sciences Corp filed Critical Material Sciences Corp
Priority to EP00947379A priority Critical patent/EP1119713A4/en
Priority to AU61002/00A priority patent/AU6100200A/en
Publication of WO2001006146A1 publication Critical patent/WO2001006146A1/en
Publication of WO2001006146A8 publication Critical patent/WO2001006146A8/en
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F15/00—Suppression of vibrations in systems; Means or arrangements for avoiding or reducing out-of-balance forces, e.g. due to motion
    • F16F15/02—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems
    • F16F15/04—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means
    • F16F15/08—Suppression of vibrations of non-rotating, e.g. reciprocating systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating systems using elastic means with rubber springs ; with springs made of rubber and metal
    • F16F15/085—Use of both rubber and metal springs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F3/00—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic
    • F16F3/08—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber
    • F16F3/10—Spring units consisting of several springs, e.g. for obtaining a desired spring characteristic with springs made of a material having high internal friction, e.g. rubber combined with springs made of steel or other material having low internal friction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F7/00—Vibration-dampers; Shock-absorbers
    • F16F7/10—Vibration-dampers; Shock-absorbers using inertia effect
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
    • F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
    • F16F9/30—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium
    • F16F9/306—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium with solid or semi-solid material, e.g. pasty masses, as damping medium of the constrained layer type, i.e. comprising one or more constrained viscoelastic layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/56—Damping, energy absorption
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B33/00—Constructional parts, details or accessories not provided for in the other groups of this subclass
    • G11B33/02—Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
    • G11B33/08—Insulation or absorption of undesired vibrations or sounds
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/23—Sheet including cover or casing
    • Y10T428/237—Noninterengaged fibered material encased [e.g., mat, batt, etc.]
    • Y10T428/238—Metal cover or casing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24322—Composite web or sheet

Definitions

  • damping material The invention has application to damping vibrations in vibrating or
  • vibration generating systems such as computer disk drive assemblies, automotive body
  • Vibrational energy or force is often transmitted from its source to another structure
  • disk drive assemblies often require a relatively vibration-free
  • the rotating parts of disk drive assemblies can be any rotating parts of disk drive assemblies.
  • FIG. 1 there is illustrated a portion of
  • a prior art disk drive assembly 10 which has a spindle 11 having a fixed inner portion 12 and a rotating outer portion 13.
  • the disk drive assembly housing has a cover 14 which
  • the screw shank also passes through and engages a washer 17, known as a
  • viscoelastic layer 18 may have a thickness of about 1-10 mils and could, if desired, be
  • the layer 18 serves to adhesively secure the cover 14 to
  • layer arrangement including a metal skin having a viscoelastic polymer adhesive on one side thereof which is secured to the outer surface of the cover 14.
  • the invention consists of certain novel features and a combination of parts
  • FIG. 1 is a fragmentary view in vertical section through a portion of a prior art disk
  • FIG. 2 is a view similar to FIG. 1, illustrating a prior art vibration damping
  • FIG. 4 is a fragmentary top plan view of the embodiment of FIG. 3;
  • FIG. 5 is a view similar to FIG. 1 , illustrating another embodiment of the present
  • an embodiment of the present invention involves
  • a damped metal laminate cover 20 has inner and outer metal skins 21 and 22 secured together and spaced apart by a viscoelastic layer 23.
  • the cuts are generally V-shaped in transverse
  • the cover 20 could also be provided with only the cut 27 or only the cut 28 and still
  • aperture 58 isolating most of the vibration damping structure 50 from direct contact with
  • the body 51 Preferably, there is only an inner metal skin 53 and an outer metal
  • the damping layer 55 is preferably a viscoelastic material which is capable of
  • the cuts 56 are preferably circular, encompassing and isolating an area of the metal
  • damping layer 55 While optimal vibration damping is achieved by having circular cuts extending to the damping layer, it will be appreciated that vibration damping can still be
  • isolation concept can be used in any application wherein a force, from a motor or
  • a sheet metal component such as a computer cabinet
  • thicknesses of these portions may vary widely, depending upon the particular structural characteristics

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Aviation & Aerospace Engineering (AREA)
  • Vibration Prevention Devices (AREA)
  • Laminated Bodies (AREA)

Abstract

More specifically, there is provided a vibration damping structure having an inner metal skin (21) and an outer metal skin (22) and a damping layer (23) secured between the metal skins (21, 22), with each of the metal skins (21, 22) having a cut (27, 28) therein. The damping layer (23) is a viscoelastic material which is capable of adhering to the metal skins (21, 22). The cuts (27, 28) are circular, encompassing and isolating an area wherein a connecting means (15) connects the vibration damping structure to another body. The cuts (27, 28) extend through the inner metal skin (21) and the outer metal skin (22) to the damping layer (23).

Description

VIBRATION ISOLATING CONSTRUCTION
Related Application
This application claims the benefit of the filing date of copending U.S. Provisional
Application No. 60/143,910, filed July 14, 1999.
Background
The present invention relates to the reduction of vibration and noise by damping
constructions, and particularly such damping constructions utilizing a layer of viscoelastic
damping material. The invention has application to damping vibrations in vibrating or
vibration generating systems, such as computer disk drive assemblies, automotive body
panels, electronic cabinetry, or motor shrouds.
Vibrational energy or force is often transmitted from its source to another structure
through a bolt, a screw or other connecting means which connects the vibrational source
to the structure. In many applications this transmission of vibrational energy or force has
a deleterious effect, often creating noise or excessive wear in critical components.
Consequently, the ability to stop or reduce the transmission of vibrational energy or force
is of great importance in certain applications.
For example, disk drive assemblies often require a relatively vibration-free
environment to function optimally. The rotating parts of disk drive assemblies can
inherently generate vibration and noise which, at certain levels, can degrade the
performance of the drive assembly. Referring to FIG. 1, there is illustrated a portion of
a prior art disk drive assembly 10 which has a spindle 11 having a fixed inner portion 12 and a rotating outer portion 13. The disk drive assembly housing has a cover 14 which
is fastened to the inner portion 12 of the spindle 11, as by a screw 15. This construction
permits vibrations to be mechanically coupled to the cover 14 through the spindle portion
12 and the screw 15.
To reduce the vibrations of the disk drive assembly, the arrangement of FIG.2 was
introduced. In this arrangement the head of the screw 15 passes through a hole 16 in the
cover 14. The screw shank also passes through and engages a washer 17, known as a
"whirl" washer, and an overlying viscoelastic layer 18, which are interposed between the
spindle portion 12 and the cover 14. The washer 17 may be formed of stainless steel,
having a thickness in the range of from about 10 mils to about 20 mils, and the
viscoelastic layer 18 may have a thickness of about 1-10 mils and could, if desired, be
formed by a viscoelastic tape. The layer 18 serves to adhesively secure the cover 14 to
the washer 17 which is, in turn, fixed to the spindle portion 12 by the screw 15. Thus,
mechanical transmission of vibration from the spindle to the cover 14 is inhibited. The
washer 17 and viscoelastic layer 18 serve to isolate the cover 14 from the spindle 11 at
high frequencies and introduce damping into the system of the disk drive and cover
assembly at lower frequencies.
Another approach is to damp any vibrations which do get transmitted into the cover
14, by applying to its outer surface a damping construction, which may be a constrained-
layer arrangement including a metal skin having a viscoelastic polymer adhesive on one side thereof which is secured to the outer surface of the cover 14.
While these prior arrangements, particularly in combination, are effective in
damping vibrations, they are relatively expensive to manufacture, involving assembly of
a number of parts.
Summary
It is a general object of the invention to provide an improved vibration damping
arrangement which avoids the disadvantages of prior arrangements, while affording
additional structural and operating advantages.
An important feature of the invention is the provision of a damping arrangement
of the type set forth, which is of relatively simple and economical construction.
Another feature of the invention is the provision of a damping arrangement which
is adaptable for use in the covers of disk drive assemblies to introduce high damping and
to isolate the cover from the mechanical transmission of vibration thereto from the drive
assembly.
The invention consists of certain novel features and a combination of parts
hereinafter fully described, illustrated in the accompanying drawings, it being understood
that various changes in the details may be made without departing from the spirit, or
sacrificing any of the advantages of the present invention.
Brief Description of the Drawings
For the purpose of facilitating an understanding of the subject matter sought to be protected, there are illustrated in the accompanying drawings embodiments thereof, from
an inspection of which, when considered in connection with the following description, the
subject matter sought to be protected, its construction and operation, and many of its
advantages should be readily understood and appreciated.
FIG. 1 is a fragmentary view in vertical section through a portion of a prior art disk
drive assembly;
FIG. 2 is a view similar to FIG. 1, illustrating a prior art vibration damping
arrangement;
FIG. 3 is a view similar to FIG. 1, illustrating an embodiment of the present
invention;
FIG. 4 is a fragmentary top plan view of the embodiment of FIG. 3; and
FIG. 5 is a view similar to FIG. 1 , illustrating another embodiment of the present
invention.
Detailed Description
Referring to FIGS. 3 and 4, an embodiment of the present invention involves
constructing the cover of the disk drive assembly 10 to include a vibration damping
structure, and eliminating the whirl washer. This cover construction offers the same
advantages as applying a constrained-layer damping construction to the outer surface of
the prior art cover 14, but is much simpler and less expensive to fabricate. In this
embodiment a damped metal laminate cover 20 has inner and outer metal skins 21 and 22 secured together and spaced apart by a viscoelastic layer 23. The shank of the screw 1
passes through a hole 26 in the cover 20 dimensioned so that the shank engages the cover,
and the cover 20 is clamped between the head of the screw 15 and the fixed portion 12 of
the spindle, as seen in FIG. 3. In order to isolate vibrations from the cover 20, the inner
skin 21 is provided with a circular cut 27 therein coaxial with the screw 15, and the outer
skin 22 has a circular cut 28 therein, also coaxial with the screw and preferably of a
slightly smaller diameter than the cut 27. Preferably, each of the cuts 27 and 28 passes
through the entire thickness of the associated metal skin, to the viscoelastic layer 23.
Thus, while mechanical vibrations can be transmitted directly to the portion of the cover
20 immediately surrounding the screw 15, that portion is effectively isolated by the cuts
27 and 28 from the rest of the cover 20. Thus, these isolation cuts serve effectively the
same purpose as the prior art whirl washer 17 and viscoelastic layer 18 and prevent
vibrations from propagating into the cover.
While, in the illustrated embodiment, the cuts are generally V-shaped in transverse
cross section, it will be appreciated that they could have other cross sections, such as being
straight-sided or the like, the important point being to sever or isolate most of the skin area
from the portion immediately surrounding the screw 15.
Preferably, the cuts 27 and 28 are formed as close as possible to the screw 15.
While the cuts 27 and 28 are preferably of different diameter, it does not matter which one
has the larger diameter. While circular cuts are shown, other shapes which encompass the screw 15 could be used.
While optimum isolation benefits are achieved by providing both of the cuts 27 and
28, the cover 20 could also be provided with only the cut 27 or only the cut 28 and still
achieve significant damping, although not as effective as when both cuts are provided.
Referring to Figure 5, there is illustrated a vibration damping structure 50 which
reduces the transmission of vibration between the damping structure 50 and a body 51
attached thereto by a securing means 52 extending through an aperture 58 in the vibration
damping structure 50. More specifically, the vibration damping structure 50 includes at
least two metal skins 53 and 54 and a damping layer 55 secured between the metal skins
53, with each of the metal skins having a cut therein. A depression 57 surrounds the
aperture 58 isolating most of the vibration damping structure 50 from direct contact with
the body 51. Preferably, there is only an inner metal skin 53 and an outer metal
skin 54, but additional metal skins may be added for greater stability and support.
The damping layer 55 is preferably a viscoelastic material which is capable of
adhering to the metal skins 53 and 54; however, other materials having vibration damping
characteristics can be used.
The cuts 56 are preferably circular, encompassing and isolating an area of the metal
skins 53 and 54 in direct contact with the connecting means 52 and the body 51. The cuts
56 preferably extend through the inner metal skin 53 and the outer metal skin 54 to the
damping layer 55. While optimal vibration damping is achieved by having circular cuts extending to the damping layer, it will be appreciated that vibration damping can still be
achieved if the shape and the depth of the cuts are altered.
While the invention is illustrated as being used at the attachment point of the cover
to a disk drive assembly spindle, it will be appreciated that the same isolation technique
5 could be used at any of the various fastener locations along the cover. Indeed, this
isolation concept can be used in any application wherein a force, from a motor or
otherwise, is being transmitted to a sheet metal component, such as a computer cabinet,
set-top box, etc . , where vibration and/or noise resulting therefrom could have a deleterious
effect.
o While, in the illustrated embodiment, the skins 21 and 22 of the cover 20 are shown
as being substantially thicker than the viscoelastic layer 23, it will be appreciated that this
is simply for purposes of illustration and that, in practice, the relative and absolute
thicknesses of these portions may vary widely, depending upon the particular structural
and damping requirements of the application.
s The matter set forth in the foregoing description and accompanying drawings is
offered by way of illustration only and not as a limitation. While particular embodiments
have been shown and described, it will be obvious to those skilled in the art that changes
and modifications may be made without departing from the broader aspects of applicants'
contribution. The actual scope of the protection sought is intended to be defined in the
o following claims when viewed in their proper perspective based on the prior art.

Claims

What is claimed is:
1. A vibration damping structure comprising two metal skins and a damping layer
secured between said metal skins, each of said metal skins having a cut therein.
2. The vibration damping structure in claim 1, wherein said damping layer is
formed of a viscoelastic material.
3. The vibration damping structure in claim 1, wherein said metal skins are an
inner metal skin and an outer metal skin.
4. The vibration damping structure in claim 1, wherein each cut is generally V-
shaped in transverse cross section.
5. The vibration damping structure in claim 1, wherein each of the cuts extends
through its associated metal skin to said damping layer.
6. The vibration damping structure in claim 1 , wherein each of said metal skins has
only a single cut.
7. The vibration damping structure in claim 6, wherein said vibration damping
structure has an aperture extending therethrough, each of the cuts is circular and coaxial
to said aperture.
8. The vibration damping structure in claim 7, wherein the cut in one metal skin
is of a different diameter than the cut in the other metal skin.
9. A vibration damping structure comprising an outer metal skin, an inner metal
skin and a damping layer secured between said metal skins, said structure having an aperture therethrough, at least one of said inner and outer metal skins having a cut therein
which encompasses said aperture.
10. The vibration damping structure in claim 9, wherein said damping layer is of
a viscoelastic material.
11. The vibration damping structure in claim 9, wherein the cut extends through
at least one metal skin to said damping layer.
12. The vibration damping structure in claim 9, wherein both skins have cuts
encompassing said aperture.
13. The vibration damping structure in claim 9, wherein each of said cuts extends
through its associated metal skin to said damping layer.
14. The vibration damping structure in claim 13, wherein each of said cuts is
circular and coaxial with said aperture.
15. The vibration damping structure in claim 14, wherein each of said cuts is
generally V-shaped in transverse cross section.
16. The vibration damping structure in claim 15, wherein the cuts have different
radii.
17. The vibration damping structure in claim 16, further comprising a fastener
extending through said aperture for securing the structure to an associated source of
vibrations.
18. The vibration damping structure in claim 9, wherein said cut is coaxial with said aperture.
19. A disk drive assembly comprising:
a cover comprising an outer metal skin, an inner metal skin and a damping layer
secured between said metal skins, said cover having an aperture therethrough, at least one
of said inner and outer metal skins having a cut therein which encompasses said aperture;
and
a spindle connected to said cover, said spindle having a rotatable member.
20. The disk drive assembly in claim 19, wherein said damping layer is comprised
of a viscoelastic material.
21. The disk drive assembly in claim 19, further comprising a fastener extending
through said aperture in said cover to said spindle.
22. The disk drive assembly in claim 19, wherein said cut is circular and coaxial
to said aperture.
23. The disk drive assembly in claim 22, wherein the cuts are generally V-shaped
in transverse cross section.
24. The disk drive assembly in claim 23, wherein the cuts have different radii.
PCT/US2000/019254 1999-07-14 2000-07-13 Vibration isolating construction Ceased WO2001006146A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP00947379A EP1119713A4 (en) 1999-07-14 2000-07-13 Vibration isolating construction
AU61002/00A AU6100200A (en) 1999-07-14 2000-07-13 Vibration isolating construction

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US14391099P 1999-07-14 1999-07-14
US60/143,910 1999-07-14

Publications (2)

Publication Number Publication Date
WO2001006146A1 true WO2001006146A1 (en) 2001-01-25
WO2001006146A8 WO2001006146A8 (en) 2001-05-17

Family

ID=22506224

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2000/019254 Ceased WO2001006146A1 (en) 1999-07-14 2000-07-13 Vibration isolating construction

Country Status (4)

Country Link
US (1) US6621658B1 (en)
EP (1) EP1119713A4 (en)
AU (1) AU6100200A (en)
WO (1) WO2001006146A1 (en)

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US6621658B1 (en) 2003-09-16
AU6100200A (en) 2001-02-05

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