Patent US3905246A successfully refreshed from Google Patents.
US3905246A
Expired / Lapsed
US
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Construction and method for forming a plunger seal
Assignee: Illinois Tool Works Inc
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Filing: 1974-06-05
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Granted: 1975-09-16
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Expires: 1994-06-05
Abstract
Abstract A seal for a plunger of a switch or the like is provided by a thin flexible membrane, the outer periphery of which extends into a recessed groove in the housing through which the plunger passes. The center of the membrane is provided with a central aperture which receives the plunger. The membrane forms a tight seal with the plunger and a reduced diameter groove in the plunger. A spring washer is placed over the top of the membrane and is forced into the recessed groove so that the outer periphery of the washer is secured in the groove to form a seal for the housing.
Inventors
- 👤 Alvin Herman Breckenfelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:40
CPC Classifications
B; B41; B41F; B41F31/00; B41F31/001; F; F16; F16J; F16J15/00; F16J15/50; F16J15/52; H; H01; H01H; H01H13/00; H01H13/02; H01H13/04; H01H13/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
148 words
In a plunger seal for a device comprising a housing with an aperture therein, a vertically movable plunger which passes through said aperture, a recessed circular groove formed in said housing around said plunger having substantially vertical inner and outer walls and a substantially horizontal base and a thin flexible circular membrane having a central aperture which forms a compression seal with said plunger and an outer periphery which extends into said groove so that said thin flexible membrane engages said inner wall and at least a portion of said base, the improvement comprising a securing member having a plurality of external teeth and a vertically, circular extending rim wherein said teeth of said securing member are wedged into said outer wall of said groove so as to compress said membrane between said teeth and said base and between said rim and said inner wall of said groove.
Claim 2
Dependent Claim
148 words
In a plunger seal for a device comprising a housing with an aperture therein, a vertically movable plunger which passes through said aperture, a recessed circular groove formed in said housing around said plunger having substantially vertical inner and outer walls and a substantially horizontal base and a thin flexible circular membrane having a central aperture which forms a compression seal with said plunger and an outer periphery which extends into said groove so that said thin flexible membrane engages said inner wall and at least a portion of said base, the improvement comprising a securing member having a plurality of external teeth and a vertically, circular extending rim wherein said teeth of said securing member are wedged into said outer wall of said groove so as to compress said membrane between said teeth and said base and between said rim and said inner wall of said groove.
Claim 3
Dependent Claim
17 words
The improvement claimed in claim 1 wherein said securing member is an external tooth, spring-tempered lock washer.
References Cited (Backward Citations)
US278597A
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US1289434A
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US1507567A
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US1624852A
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US2305265A
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US2687015A
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US3178191A
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US3748913A
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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) | 1978-09-15 | 1979-03-17 | 1979-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-15 | 1983-03-17 | 1983-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-15 | 1987-03-17 | 1987-09-16 | $7700.00 | Window Closed / Lapsed |