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US3987861A
Expired / Lapsed
US
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Apparatus for nullifying the effects of angular acceleration of frames tiltably mounting balance beams and the like
Assignee: Mettler Toledo GmbH Germany
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Filing: 1975-09-12
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Granted: 1976-10-26
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Expires: 1995-09-12
Abstract
Abstract A device which includes a frame supporting a lever arm for tiltable movement about a horizontal axis intermediate the ends thereof and, more particularly, to an improved apparatus for nullifying the effects of angular acceleration of such frame relative to its lever arm which comprises a counterweight and hanger means for suspending the counterweight between the frame and arm which cooperate with one another under the influence of inertial forces tending to angularly accelerate one relative to the other by generating an offsetting inertial force operative to maintain a condition of stable equilibrium therebetween.
Inventors
- 👤 James E. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:44
CPC Classifications
G; G01; G01G; G01G1/00; G01G1/18; G01G1/26; G01G23/00; G01G23/06
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
226 words
In a device that includes a rigid frame supporting a beam for tiltable movement about a horizontal axis displaced to one side of its centroid a distance effective to produce a condition of substantial imbalance therein, the improved means for counteracting those inertial forces tending to angularly accelerate one of said elements relative to the other which comprises: a counterweight sized to offset the condition of imbalance in the beam and restore same to an equilibrium position under static no-load conditions mounted upon the frame for tiltable movement about an instantaneous axis of rotation paralleling the axis of tiltable movement of the beam and spaced to one side of said counterweight's centroid a distance less than the radius of gyration of said counterweight; and, hanger means operatively connecting said beam and counterweight together for coordinated tiltable movement relative to one another and to the frame, the points of attachment of said hanger means to said counterweight and to said beam being spaced from their respective axes of pivotal movement distances effective to cooperate with the mass of said counterweight, the direction said counterweight tilts relative to the beam and the inertias of said beam and counterweight about their respective centroids so as to nullify substantially all relative motion between said beam and frame occasioned by inertial forces operative to bring about angular acceleration of the latter.
Claim 2
Dependent Claim
226 words
In a device that includes a rigid frame supporting a beam for tiltable movement about a horizontal axis displaced to one side of its centroid a distance effective to produce a condition of substantial imbalance therein, the improved means for counteracting those inertial forces tending to angularly accelerate one of said elements relative to the other which comprises: a counterweight sized to offset the condition of imbalance in the beam and restore same to an equilibrium position under static no-load conditions mounted upon the frame for tiltable movement about an instantaneous axis of rotation paralleling the axis of tiltable movement of the beam and spaced to one side of said counterweight's centroid a distance less than the radius of gyration of said counterweight; and, hanger means operatively connecting said beam and counterweight together for coordinated tiltable movement relative to one another and to the frame, the points of attachment of said hanger means to said counterweight and to said beam being spaced from their respective axes of pivotal movement distances effective to cooperate with the mass of said counterweight, the direction said counterweight tilts relative to the beam and the inertias of said beam and counterweight about their respective centroids so as to nullify substantially all relative motion between said beam and frame occasioned by inertial forces operative to bring about angular acceleration of the latter.
Claim 3
Dependent Claim
35 words
The improvement as set forth in claim 1 wherein the point of attachment of the hanger means to the counterweight lies on the opposite side of the centroid thereof from its axis of tiltable movement.
Claim 4
Dependent Claim
35 words
The improvement as set forth in claim 1 wherein the point of attachment of the hanger means to the beam lies on the same side of the centroid thereof as its axis of tiltable movement.
Claim 5
Dependent Claim
34 words
The improvement as set forth in claim 1 wherein the axes of tiltable movement of the beam and counterweight are displaced to one side of their respective centroid so as to define parallel planes.
Claim 6
Dependent Claim
44 words
The improvement as set forth in claim 1 wherein the beam and counterweight lie in superimposed relation one above the other; and, in which the points of attachment between the hanger means and said beam and counterweight lie in vertically-spaced relation to one another.
Claim 7
Dependent Claim
33 words
The improvement as set forth in claim 1 wherein the point of attachment of the hanger means to the counterweight lies inside the circle defined by the radius of gyration of the latter.
Claim 8
Dependent Claim
31 words
The improvement as set forth in claim 1 wherein the centroid of the counterweight together with its axis of tiltable movement and point of attachment to the hanger means are coplanar.
Claim 9
Dependent Claim
18 words
The improvement as set forth in claim 1 wherein the hanger means comprises a flexible essentially non-elastic tape.
Claim 10
Dependent Claim
36 words
The improvement as set forth in claim 1 wherein the hanger means comprises a rigid stirrup; and, in which the points of attachment between said stirrup and beam and counterweight are defined by knife-edge bearing blocks.
Claim 11
Dependent Claim
21 words
The improvement as set forth in claim 1 wherein the counterweight tilts in a direction opposite to that of the beam.
Claim 12
Dependent Claim
21 words
The improvement as set forth in claim 1 wherein the axis of tiltable movement of the counterweight comprises a knifeedge bearing.
Claim 13
Dependent Claim
23 words
The improvement as set forth in claim 11 wherein the hanger means comprises a flexible tape which will not elongate appreciably under load.
Claim 14
Dependent Claim
115 words
The improvement as set forth in claim 1 in which: I.sub.cw R.sub.4 = I.sub.B (R.sub.O +R.sub.1) + M.sub.cw R.sub.O R.sub.4 (R.sub.1 R.sub.4) where I cw is the inertia of the counterweight about its centroid, I B is the inertia of the beam system about its centroid, M cw is the mass of the counterweight, R 4 is the distance separating the axis of tiltable movement of the beam from its point of attachment to the hanger means, R O is the distance separating the axis of tiltable movement of the counterweight from its centroid, and R 1 is the distance separating the centroid of the counterweight from its point of attachment to the hanger means.
Claim 15
Dependent Claim
15 words
The improvement as set forth in claim 2 wherein: R O = R 1 .
Claim 16
Dependent Claim
15 words
The improvement as set forth in claim 2 wherein: R O < R 1 .
Claim 17
Dependent Claim
38 words
The improvement as set forth in claim 1 wherein both the axis of tiltable movement of the counterweight and its point of attachment to the hanger means lie inside the circle defined by said counterweight's radius of gyration.
Claim 18
Dependent Claim
39 words
The improvement as set forth in claim 16 wherein the counterweight comprises a cylinder having openings on both sides thereof within which are located its axis of tiltable movement and the point of attachment of the hanger means thereto.
Claim 19
Dependent Claim
16 words
The improvement as set forth in claim 17 wherein the counterweight has a Yo-Yo type configuration.
Claim 20
Dependent Claim
21 words
The improvement as set forth in claim 18 wherein the axis of tiltable movement of the counterweight comprises a knife-edge bearing.
Claim 21
Dependent Claim
23 words
The improvement as set forth in claim 18 wherein the hanger means comprises a flexible tape which will not elongate appreciably under load.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |