US3869906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Element applicable as or in a transducer (load cell)
Assignee: BOFARS AB
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Filing: 1972-12-26
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Granted: 1975-03-11
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Expires: 1992-12-26
Abstract
Abstract A transducer device includes an outer member and an inner member coaxially spaced from the outer members, the members being connected via a membrane integral with the members at one of their end faces. A plurality of strain-gauge-supporting laminar beams are spaced around the annular gap between the members and connected thereto with the planes of the beams being perpendicular to the plane of the membrane.
Inventors
- 👤 John Erik Andersson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:38
CPC Classifications
G; G01; G01L; G01L9/00; G01L9/0041; G01L9/0051; G01L9/006; G01L9/0064
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
72 words
A transducer element comprising a tubular outer member, an inner member coaxially disposed within said outer member, a membrane integral with one end of each of said inner and outer members for maintaining said members in annularly spaced relationship, at least two shear strained beams integrally extending between said members, each of said beams being a thin plate integral with and perpendicular to said membrane, and strain gauges mounted on said beams.
Claim 2
Dependent Claim
72 words
A transducer element comprising a tubular outer member, an inner member coaxially disposed within said outer member, a membrane integral with one end of each of said inner and outer members for maintaining said members in annularly spaced relationship, at least two shear strained beams integrally extending between said members, each of said beams being a thin plate integral with and perpendicular to said membrane, and strain gauges mounted on said beams.
Claim 3
Dependent Claim
72 words
A transducer element comprising a tubular outer member, an inner member coaxially disposed within said outer member, a membrane integral with one end of each of said inner and outer members for maintaining said members in annularly spaced relationship, at least two shear strained beams integrally extending between said members, each of said beams being a thin plate integral with and perpendicular to said membrane, and strain gauges mounted on said beams.
Claim 4
Dependent Claim
72 words
A transducer element comprising a tubular outer member, an inner member coaxially disposed within said outer member, a membrane integral with one end of each of said inner and outer members for maintaining said members in annularly spaced relationship, at least two shear strained beams integrally extending between said members, each of said beams being a thin plate integral with and perpendicular to said membrane, and strain gauges mounted on said beams.
Claim 5
Dependent Claim
26 words
The transducer element of claim 1 wherein the height of said members is between 10 and 15 percent of the outside diameter of said outer member.
Claim 6
Dependent Claim
13 words
The transducer element of claim 2 wherein there are at least three beams.
Claim 7
Dependent Claim
14 words
The transducer element of claim 1 wherein said thin plates are quadrilateral in shape.
Claim 8
Dependent Claim
38 words
The transducer element of claim 1 wherein the faces of the beams are concave in a cross sectional plane parallel to said membrane and said strain gauges are mounted in the region where the beams are the thinnest.
Claim 9
Dependent Claim
31 words
The transducer element of claim 1 wherein the regions where the beams are connected to the members, the members are cut back so as to increase the length of the beams.
Claim 10
Dependent Claim
30 words
The transducer element of claim 1 further comprising a second membrane disposed over the outer ends of said members to provide a sealed housing for said beams and strain gauges.
Claim 11
Dependent Claim
23 words
The transducer element of claim 1 wherein the height of said outer member is greater than said inner member to provide overload protection.
Claim 12
Dependent Claim
21 words
The transducer element of claim 1 wherein said outer member is provided with an internal channel for the passage of coolant.
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) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |