US3828295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture impervious impact shield for a transducer and method of making the same
Assignee: Avery Weigh Tronix LLC
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Filing: 1973-07-12
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Granted: 1974-08-06
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Expires: 1993-07-12
Abstract
Abstract A moisture impervious impact shield is provided for a transducer including an elastically deformable bar having a plurality of electrical strain gauges mounted thereon for measuring the elastic deformation of the bar. The method employed in making the moisture impervious impact shield comprises forming and bonding an inner sleeve to and covering that portion of the bar to which the strain gauge is attached. This sleeve is formed of a foamed material, preferably silicone-rubber foam, which has a low bulk modulus, and therefore does not affect the transducer bar during elastic deformation thereof. An intermediate sleeve is then formed of a moisture impervious material, preferably silicone rubber and encases the inner sleeve. An outer metallic sleeve surrounds and is bonded to the intermediate sleeve and protects the electrical strain gauges against impact-type damage.
Inventors
- 👤 R Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:04
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2287
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
A transducer device comprising: an elongate elastically deformable bar being elastically deformable in response to a load applied thereto, a plurality of pairs of electrical strain gauges mounted on said bar for detecting changes in the electrical properties of the strain gauges produced in response to elastic deformation of the bar, said strain gauges being adapted to be connected to electrical measuring circuitry for measuring the changes in electrical properties in strain gauges and producing an output representative of the magnitude of the load, an inner sleeve formed of a low bulk modulus foamed material adhering to said bar and covering said strain gauges, the bulk modulus of said inner sleeve being sufficiently low so as not to affect the bar during elastic deformation thereof, an intermediate sleeve formed of moisture impervious nonmetallic material completely covering and adhering to said first sleeve and adhering to said bar, and an outer sleeve formed of a rigid material and covering and bonded to said intermediate sleeve.
Claim 2
Dependent Claim
164 words
A transducer device comprising: an elongate elastically deformable bar being elastically deformable in response to a load applied thereto, a plurality of pairs of electrical strain gauges mounted on said bar for detecting changes in the electrical properties of the strain gauges produced in response to elastic deformation of the bar, said strain gauges being adapted to be connected to electrical measuring circuitry for measuring the changes in electrical properties in strain gauges and producing an output representative of the magnitude of the load, an inner sleeve formed of a low bulk modulus foamed material adhering to said bar and covering said strain gauges, the bulk modulus of said inner sleeve being sufficiently low so as not to affect the bar during elastic deformation thereof, an intermediate sleeve formed of moisture impervious nonmetallic material completely covering and adhering to said first sleeve and adhering to said bar, and an outer sleeve formed of a rigid material and covering and bonded to said intermediate sleeve.
Claim 3
Dependent Claim
18 words
The transducer device as defined in claim 1 wherein said inner sleeve is formed of a silicone-rubber foam.
Claim 4
Dependent Claim
18 words
The transducer device as defined in claim 1 wherein said outer sleeve is formed of a metallic material.
Claim 5
Dependent Claim
32 words
The transducer device as defined in claim 1 wherein said inner sleeve is formed of silicone-rubber foam, said intermediate sleeve being formed of silicone-rubber, and said outer sleeve being formed of metal.
Claim 6
Dependent Claim
163 words
A transducer device comprising: an elongate elastically deformable bar being elastically deformable in response to a load applied thereto, a plurality of pairs of electrical strain gauges mounted on said bar for detecting changes in the electrical properties of the strain gauges produced in response to elastic deformation of the bar, said strain gauges being adapted to be connected to electrical measuring circuitry for measuring the changes in electrical properties in strain gauges and producing an output representative of the magnitude of the load, an inner sleeve formed of a low bulk modulus material adhering to said bar and covering said strain gauges, the bulk modulus of said inner sleeve being sufficiently low so as not to affect the bar during elastic deformation thereof, an intermediate moisture impervious sleeve formed of silicone rubber completely covering and adhering to said first sleeve and adhering to said bar, and an outer sleeve formed of a rigid material and covering and bonded to said intermediate sleeve.
Claim 7
Dependent Claim
163 words
A transducer device comprising: an elongate elastically deformable bar being elastically deformable in response to a load applied thereto, a plurality of pairs of electrical strain gauges mounted on said bar for detecting changes in the electrical properties of the strain gauges produced in response to elastic deformation of the bar, said strain gauges being adapted to be connected to electrical measuring circuitry for measuring the changes in electrical properties in strain gauges and producing an output representative of the magnitude of the load, an inner sleeve formed of a low bulk modulus material adhering to said bar and covering said strain gauges, the bulk modulus of said inner sleeve being sufficiently low so as not to affect the bar during elastic deformation thereof, an intermediate moisture impervious sleeve formed of silicone rubber completely covering and adhering to said first sleeve and adhering to said bar, and an outer sleeve formed of a rigid material and covering and bonded to said intermediate sleeve.
References Cited (Backward Citations)
US3338091A
Cited
US3481189A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |