Patent US3639875A successfully refreshed from Google Patents.
US3639875A
Expired / Lapsed
US
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Strain gage assembly and method of attachment
Assignee: Brewer Engineering Laboratories Inc
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Filing: 1970-08-24
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Granted: 1972-02-01
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Expires: 1990-08-24
Abstract
Abstract A strain-deformable wire resistance strain gage is cemented to a ship propeller, and covered with a settable plastic protective layer in unset state; a sheet metal overlay is spot-welded through the plastic to the propeller, after which the plastic is cured, forming a seal around the welds.
Inventors
- 👤 Given A Brewer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:45
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/20; G01L1/22; G01L1/2287; H; H01; H01C; H01C10/00; H01C10/10; H01C10/106
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
177 words
The method of attaching a strain-deformable resistance wire strain gage to a surface of a metallic structure in which strain is to be monitored, comprising the following steps: a. cementing said strain gage to said structure surface b. placing over said strain gage a protective barrier layer of settable plastic in an unset state, completely covering the exposed surface of said strain gage and extending therebeyond over a portion of said structure surface c. placing over said settable plastic barrier layer a sheet metal overlay covering that portion of said barrier layer that covers said strain gage and providing flange portions on either side thereof d. welding said flange portions of said overlay through said settable plastic barrier layer to said surface of said structure by pressing at least a part of said flange portion through said settable plastic barrier layer into contact with underlying said structure surface and causing an electric current to flow through said portion to said surface, and e. thereafter setting said settable plastic and thereby providing a void-free seal around said weld.
Claim 2
Independent Claim
177 words
The method of attaching a strain-deformable resistance wire strain gage to a surface of a metallic structure in which strain is to be monitored, comprising the following steps: a. cementing said strain gage to said structure surface b. placing over said strain gage a protective barrier layer of settable plastic in an unset state, completely covering the exposed surface of said strain gage and extending therebeyond over a portion of said structure surface c. placing over said settable plastic barrier layer a sheet metal overlay covering that portion of said barrier layer that covers said strain gage and providing flange portions on either side thereof d. welding said flange portions of said overlay through said settable plastic barrier layer to said surface of said structure by pressing at least a part of said flange portion through said settable plastic barrier layer into contact with underlying said structure surface and causing an electric current to flow through said portion to said surface, and e. thereafter setting said settable plastic and thereby providing a void-free seal around said weld.
Claim 3
Dependent Claim
13 words
The method of claim 1 wherein said settable plastic is an elastomeric material.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein said settable plastic in its said unset state conducts electric current.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said sheet metal overlay is stainless steel about 0.0003-inches thick.
Claim 6
Dependent Claim
111 words
In a strain gage assembly for monitoring deformation of a metallic structure, the combination of a strain-deformable resistance wire strain gage cemented to a surface of said structure, a protective barrier layer of settable plastic completely covering the expose surface of said strain gage and extending therebeyond over a portion of said structure surface, and a sheet metal overlay covering that portion of said protective barrier layer that covers said strain gage and providing flange portions on either side, at least a part of said flange portions being welded through said settable plastic barrier layer to said structure surface, said plastic barrier layer thereby providing a void-free seal surrounding said weld.
Claim 7
Dependent Claim
111 words
In a strain gage assembly for monitoring deformation of a metallic structure, the combination of a strain-deformable resistance wire strain gage cemented to a surface of said structure, a protective barrier layer of settable plastic completely covering the expose surface of said strain gage and extending therebeyond over a portion of said structure surface, and a sheet metal overlay covering that portion of said protective barrier layer that covers said strain gage and providing flange portions on either side, at least a part of said flange portions being welded through said settable plastic barrier layer to said structure surface, said plastic barrier layer thereby providing a void-free seal surrounding said weld.
Claim 8
Dependent Claim
13 words
The combination of claim 5 wherein said settable plastic is an elastomeric material.
Claim 9
Dependent Claim
17 words
The combination of claim 5 wherein said sheet metal overlay is of stainless steel about 0.0003-inches thick.
Claim 10
Dependent Claim
115 words
In a strain gage assembly for monitoring deformation of a metallic structure, the combination of a strain-deformable resistance wire strain gage cemented to a surface of said structure, a protective barrier layer of a settable elastomeric plastic completely covering the exposed surface of said strain gage, and extending therebeyond over a portion of said structure surface, and a stainless steel overlay about 0.0003 inches thick covering that portion of said protective barrier layer that covers said strain gage and providing flange portions on either side, at least a part of said flange portions being welded through said protective barrier layer to said structure surface, said barrier layer thereby providing a void-free seal surrounding said weld.
Claim 11
Dependent Claim
115 words
In a strain gage assembly for monitoring deformation of a metallic structure, the combination of a strain-deformable resistance wire strain gage cemented to a surface of said structure, a protective barrier layer of a settable elastomeric plastic completely covering the exposed surface of said strain gage, and extending therebeyond over a portion of said structure surface, and a stainless steel overlay about 0.0003 inches thick covering that portion of said protective barrier layer that covers said strain gage and providing flange portions on either side, at least a part of said flange portions being welded through said protective barrier layer to said structure surface, said barrier layer thereby providing a void-free seal surrounding said weld.
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) | 1975-01-31 | 1975-08-02 | 1976-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-31 | 1979-08-02 | 1980-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-31 | 1983-08-02 | 1984-02-01 | $7700.00 | Window Closed / Lapsed |