US3736795A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular transducer with strain gauges and sensitive to a force transmitted to its end surfaces via load surfaces
Assignee: Saab Bofors AB
•
Filing: 1971-05-20
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Granted: 1973-06-05
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Expires: 1991-05-20
Abstract
Abstract A tubular transducer for measuring compressive forces applied to the end thereof is provided with a plurality of axially and azimuthally displaced slots which make angles with the axis of the transducer to provide intermediate regions in the surface of the transducer that are joined by bridging regions which support strain gauges.
Inventors
- 👤 J Andersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:56
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2206; G01L1/2231; B; B21; B21B; B21B2203/00; B21B2203/38; B21B38/00; B21B38/08
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
175 words
A transducer comprising a hollow tubular body which is symmetrical about its major axis, said body being provided with a plurality of slots extending completely through said body, said slots being intermittently located circumferentially about said hollow tubular body to define first and second members each having an end surface to which can be applied forces, the ends of adjacent slots being axially and circumferentially positioned with respect to each other to define at least three overlap parts which have a length dimension having a component which extends in the direction of said major axis, each of said overlap parts being provided with a cavity such that the overlap part operates as a beam and in cross-section resembles such beam having a web connecting two flanges, so that the cross-section has a relatively large moment of inertia, and strain gauges fixed to the portions of said overlap parts which constitute the web of the beam whereby when load forces are applied to said end surfaces maximum possible shearing stresses are applied to said strain gauges.
Claim 2
Dependent Claim
175 words
A transducer comprising a hollow tubular body which is symmetrical about its major axis, said body being provided with a plurality of slots extending completely through said body, said slots being intermittently located circumferentially about said hollow tubular body to define first and second members each having an end surface to which can be applied forces, the ends of adjacent slots being axially and circumferentially positioned with respect to each other to define at least three overlap parts which have a length dimension having a component which extends in the direction of said major axis, each of said overlap parts being provided with a cavity such that the overlap part operates as a beam and in cross-section resembles such beam having a web connecting two flanges, so that the cross-section has a relatively large moment of inertia, and strain gauges fixed to the portions of said overlap parts which constitute the web of the beam whereby when load forces are applied to said end surfaces maximum possible shearing stresses are applied to said strain gauges.
Claim 3
Dependent Claim
36 words
The transducer of claim 1 wherein the cross-section is an I-beam shaped with the direction of the web substantially parallel said major axis and the flanges are parallel to the portions of said slots adjacent thereto.
Claim 4
Dependent Claim
46 words
The transducer of claim 1 wherein said strain gauges are fixed to the portions of said overlap parts which constitute the web so as to be affected by deformations in two orthogonal directions which make 45* angles with the length axis of the associated overlap part.
Claim 5
Dependent Claim
35 words
The transducer of claim 3 further comprising a Wheatstone-bridge circuit including said strain gauges so arranged to give an indication only for components of the relative displacement of the end surfaces along said major axis.
Claim 6
Dependent Claim
21 words
The transducer of claim 1 wherein the direction of the portion defining the web is substantially parallel to said major axis.
Claim 7
Dependent Claim
22 words
the transducer of claim 1 wherein the direction of the portion defining the web is at an angle to said major axis.
Claim 8
Dependent Claim
22 words
The transducer of claim 1 wherein the length of each overlap part is less than three-Quarters of the length of a slot.
Claim 9
Dependent Claim
22 words
The transducer of claim 7 wherein the length of each overlap part is between one-quarter and one-half the length of a slot.
Claim 10
Dependent Claim
42 words
The transducer of claim 8 further comprising elements in the body adjacent the slots and extending into the slots to limit the mutual compressive travel of said first and second members to a value which is less than a possible maximum value.
References Cited (Backward Citations)
US3004231A
Cited
US3100990A
Cited
US3217536A
Cited
US3205706A
Cited
US3376537A
Cited
US3422671A
Cited
US3513431A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |