US3668939A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plane omnidirectional absorber
Assignee: Carrier Vibrating Equipment Inc
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Filing: 1969-11-13
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Granted: 1972-06-13
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Expires: 1989-11-13
Abstract
Abstract A vibratory counterforce system for counterbalancing vibratory forces of constant frequency acting in a plane comprises at least one planar omnidirectional dynamic absorber, i.e. an auxiliary mass vibratory system, the natural frequency of which is substantially independent of the direction of vibration in the plane. When used in sets of two or more, and located at spaced apart points on a structure subject to vibratory forces of constant frequency, the absorbers act to minimize the vibration at their points of attachment and respond, both to translatory forces and to force couples. The absorbers or counterforce units are particularly useful when applied to the base of a vibratory conveyor because they can effectively counterbalance the vibratory forces applied to the base which vary both in amplitude and direction according to the load on the conveyor.
Inventors
- 👤 Preston H Schrader
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:48
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/10; F16F7/104; B; B06; B06B; B06B3/00; B65; B65G; B65G27/00; B65G27/10; B65G27/28; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18344
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
196 words
An apparatus for doing work by vibration, comprising in combination, a work member, a base, resilient means connecting the work member to the base for relative vibration along a prescribed path, vibratory drive means acting between said members and base for vibrating the work member relative to the base along said path at a substantially constant frequency, vibration isolators supporting the base while allowing it to vibrate in response to vibratory forces produced by the vibration of the work member and the load thereon, and means for increasing the amplitude of vibration of the work member while minimizing the vibratory force transmitted through the vibration isolators to supporting structure comprising an an auxiliary mass, and resilient means coupling the auxiliary mass to the base, said resilient means being yieldable at substantially the same spring rate along any line in a vertical plane including said path, said auxiliary mass and said resilient means having a resonant frequency that is independent of the direction of motion in said plane and that is substantially equal to the constant frequency of said drive means, whereby the motion of said base is reduced and the motion of the work member increased.
Claim 2
Independent Claim
196 words
An apparatus for doing work by vibration, comprising in combination, a work member, a base, resilient means connecting the work member to the base for relative vibration along a prescribed path, vibratory drive means acting between said members and base for vibrating the work member relative to the base along said path at a substantially constant frequency, vibration isolators supporting the base while allowing it to vibrate in response to vibratory forces produced by the vibration of the work member and the load thereon, and means for increasing the amplitude of vibration of the work member while minimizing the vibratory force transmitted through the vibration isolators to supporting structure comprising an an auxiliary mass, and resilient means coupling the auxiliary mass to the base, said resilient means being yieldable at substantially the same spring rate along any line in a vertical plane including said path, said auxiliary mass and said resilient means having a resonant frequency that is independent of the direction of motion in said plane and that is substantially equal to the constant frequency of said drive means, whereby the motion of said base is reduced and the motion of the work member increased.
Claim 3
Dependent Claim
16 words
A vibratory apparatus according to claim 1 in which the resilient means comprise an elastomer spring.
Claim 4
Dependent Claim
25 words
A vibratory apparatus according to claim 2 in which the elastomer spring is bonded to an adjacent portion of the member and to the mass.
Claim 5
Dependent Claim
24 words
A vibratory apparatus according to claim 2 in which the elastomer spring is compressed between an adjacent portion of the member and the mass.
Claim 6
Dependent Claim
18 words
A vibratory apparatus according to claim 2 in which the elastomer spring is substantially circular in cross section.
Claim 7
Dependent Claim
105 words
A vibratory counterforce producing apparatus for opposing motion of a member subjected to a plurality of vibratory forces of generally constant frequency and random phase the resultants of which are coplanar but non-concurrent, comprising at least two masses, resilient means individually connecting said masses to spaced apart points of the member in a plane generally parallel to the plane containing the lines of action of the resultants of said vibratory forces, each mass and its resilient means comprising a vibratory system having a natural frequency generally equal to said generally constant frequency for vibration along any axis or combination of axes parallel to said planes.
Claim 8
Dependent Claim
105 words
A vibratory counterforce producing apparatus for opposing motion of a member subjected to a plurality of vibratory forces of generally constant frequency and random phase the resultants of which are coplanar but non-concurrent, comprising at least two masses, resilient means individually connecting said masses to spaced apart points of the member in a plane generally parallel to the plane containing the lines of action of the resultants of said vibratory forces, each mass and its resilient means comprising a vibratory system having a natural frequency generally equal to said generally constant frequency for vibration along any axis or combination of axes parallel to said planes.
Claim 9
Dependent Claim
18 words
A vibratory counterforce according to claim 6 in which the resilient means are elastomer springs stressed in shear.
Claim 10
Dependent Claim
18 words
A vibratory counterforce according to claim 7 in which the elastomer springs are substantially circular in cross section.
Claim 11
Dependent Claim
126 words
A vibratory counterforce producing apparatus and vibratory system comprising, in combination, a vibratory work member, a base, resilient means connecting the work member to the base, means for vibrating the work member relative to the base at a substantially constant frequency, vibration isolators supporting the base from a support, and at least one vibratory counterforce, said counterforce comprising a mass and spring means forming the sole means connecTing the mass to the base to form a vibratory system having a natural frequency generally equal to said constant frequency, said spring means having a spring rate that is independent of the direction of deflection of the spring, whereby said mass and spring means vibrates to provide a counterforce opposing any periodic disturbing forces applied to said base.
Claim 12
Dependent Claim
126 words
A vibratory counterforce producing apparatus and vibratory system comprising, in combination, a vibratory work member, a base, resilient means connecting the work member to the base, means for vibrating the work member relative to the base at a substantially constant frequency, vibration isolators supporting the base from a support, and at least one vibratory counterforce, said counterforce comprising a mass and spring means forming the sole means connecTing the mass to the base to form a vibratory system having a natural frequency generally equal to said constant frequency, said spring means having a spring rate that is independent of the direction of deflection of the spring, whereby said mass and spring means vibrates to provide a counterforce opposing any periodic disturbing forces applied to said base.
Claim 13
Dependent Claim
39 words
A vibratory counterforce producing apparatus and vibratory system according to claim 9, that includes at least two counterforces applied at spaced apart points of the base whereby rotational vibration of the base as well as translatory vibration is controlled.
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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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |