US3724575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Force detecing and evaluating apparatus
Assignee: Individual
•
Filing: 1972-01-24
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Granted: 1973-04-03
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Expires: 1992-01-24
Abstract
Abstract A bending type load detecting beam, preferably of cantilever construction, includes a load supporting portion and a detecting portion. The detecting portion is of uniform area moment of inertia, modulus of elasticity, and neutral axis of bending stress throughout its effective length. Electric-resistance strain gages are bonded to a longitudinal surface of the detecting portion initially parallel to but substantially spaced from the neutral axis in the beam''s plane of bending. The gages are mounted at stations spaced a predetermined longitudinal distance apart from each other, and are aligned for longitudinal actuation along their common mounting line, making them responsive to bending of the beam''s detecting portion. By this construction the mutual difference in response of the gages to any given force such as a weight applied via the loading portion, is rendered constantly proportional to the magnitude of the force, irrespective of the shape, center of gravity or position of the applied weight on the loading portion. The constantly proportional differential gage response may be metered by electrical means calibrated to indicate or record directly the actual magnitude of the applied force. The invention also includes apparatus employing a plurality of beams of the above type, instrumentally interconnected, for weighing materials not readily supportable on a single beam.
Inventors
- 👤 A Kutsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:51
CPC Classifications
G; G01; G01G; G01G3/00; G01G3/12; G01G3/14; G01G3/142; G01G3/1402; G01G3/1404
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
160 words
In force detecting and evaluating apparatus, in combination, a bending beam including a detecting portion and a loading portion extending longitudinally from said detecting portion, said detecting portion having a neutral axis of bending stress and a gage mounting surface linearly parallel to said axis and spaced a substantial relatively vertical distance therefrom in the bending plane of said beam, and a pair of longitudinally orientated electrical-resistance strain gages bonded to said surface at two stations spaced a predetermined longitudinal distance apart to provide differing station strains and respective gage detections in response to a load force transmitted to said detecting portion by said loading portion; said detecting portion being of uniform modulus of elasticity and area moment of inertia throughout its effective length, whereby the said difference between gage detections is in constant fixed proportion to the magnitude of said load force, irrespective of the particular location on said loading portion at which said force may be effectively applied.
Claim 2
Dependent Claim
160 words
In force detecting and evaluating apparatus, in combination, a bending beam including a detecting portion and a loading portion extending longitudinally from said detecting portion, said detecting portion having a neutral axis of bending stress and a gage mounting surface linearly parallel to said axis and spaced a substantial relatively vertical distance therefrom in the bending plane of said beam, and a pair of longitudinally orientated electrical-resistance strain gages bonded to said surface at two stations spaced a predetermined longitudinal distance apart to provide differing station strains and respective gage detections in response to a load force transmitted to said detecting portion by said loading portion; said detecting portion being of uniform modulus of elasticity and area moment of inertia throughout its effective length, whereby the said difference between gage detections is in constant fixed proportion to the magnitude of said load force, irrespective of the particular location on said loading portion at which said force may be effectively applied.
Claim 3
Dependent Claim
30 words
Apparatus according to claim 1 wherein said longitudinal gage mounTing surface comprises a peripheral zone of a hole disposed in said detecting portion in initial parallelism with said neutral axis.
Claim 4
Dependent Claim
36 words
Apparatus according to claim 1 including electrical circuit means operationally incorporating said gages and adapted to translate said constant proportion of said detecting difference to said magnitude of applied force into direct indication of said magnitude.
Claim 5
Dependent Claim
67 words
Apparatus according to claim 1 wherein said bending beam extends in a substantially horizontal direction for weighing accurately an item placed at random on said loading portion of said beam, the total weight of said item constituting the force applied through the center of gravity of said item to said loading portion irrespective of the shape, composition or the placement of said item on said loading portion.
Claim 6
Dependent Claim
91 words
Apparatus according to claim 1 including a similar second bending beam structurally associated with said first beam but laterally spaced therefrom, said second beam having a second pair of strain gages disposed in said inter-gage spaced relation, whereby a total force applied at random to both the loading portions of said two beams may produce individual differential detective responses in said two pairs of gages, said differential response by each pair of gages being in constant proportion to the fraction of said total loading force applied to said pair''s respective beam.
Claim 7
Dependent Claim
35 words
Apparatus according to claim 5 including electrical circuit means operationally incorporating both said pairs of gages and adapted to translate said two fractionally detected proportions into a single direct indication of said total load force.
Claim 8
Dependent Claim
94 words
Apparatus according to claim 1 wherein said detecting portion of said beam has a second longitudinal mounting surface initially parallel to said first mounting surface, and including a second pair of longitudinally orientated and spaced strain gages bonded to said second surface, said second surface being spaced from said neutral axis on the opposite side of said axis with respect to said first surface, whereby differential detection by one of said pairs of gages may be responsive to tensional strains while differential response of the other pair is to compressional strains in said beam.
Claim 9
Dependent Claim
47 words
Apparatus according to claim 7 including electrical circuit means operationally incorporating both said pairs of gages and adapted to translate said tensional and compressional gage differential detections additively to a direct indication of the applied straining force, whereby said detectional combination may function with maximum resultant sensitivity.
Claim 10
Dependent Claim
38 words
Apparatus according to claim 2 wherein said second longitudinal mounting surface comprises a peripheral zone of a second longitudinal hole disposed in said beam''s detecting portion in initially parallel relation with said first hole and said neutral axis.
Claim 11
Dependent Claim
38 words
Apparatus according to claim 7 wherein said second longitudinal mounting surface comprises a peripheral zone of a second longitudinal hole disposed in said beam''s detecting portion in initially parallel relation with said first hole and said neutral axis.
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |