US3659306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wiper for machined surfaces
Assignee: United States Department of the Navy
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Filing: 1970-06-22
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Granted: 1972-05-02
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Expires: 1990-06-22
Abstract
Abstract A wiper ring for cleaning the inside wall of the operating cylinder of a hydromatic variable pitch aircraft propeller. The ring has a debris collecting wiper edge and incorporates a plurality of permanent magnets spaced at intervals along its length to attract and hold ferrous particles collected by the wiper edge and prevent them from being abraded into the inside wall of the operating cylinder.
Inventors
- 👤 Leon Stoltze
- 👤 Fred David Laun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:55
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3204
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
149 words
An abrasive material entrapping wiper for circular hydraulic elements having reciprocatory motion comprising: a ring of resilient material having a contact surface engageable with and slideable over a surface to be wiped; said ring being mountable upon a support surface with which the surface to be wiped has relative movement; the cross sectional configuration of said ring being shaped to provide a trough portion spaced from the surface being wiped and into which trough contaminant particles may be swept and retained; means for generating magnetic lines of force in the area of said wiping contact to thereby attract particles subject to such force to the trough portion removed from the wiped area; wherein the means for generating magnetic lines of force comprise magnets distributed at intervals along the wiper, said magnets being embedded in the wiper, being elongate and having their axes parallel to the surface to be wiped.
Claim 2
Dependent Claim
149 words
An abrasive material entrapping wiper for circular hydraulic elements having reciprocatory motion comprising: a ring of resilient material having a contact surface engageable with and slideable over a surface to be wiped; said ring being mountable upon a support surface with which the surface to be wiped has relative movement; the cross sectional configuration of said ring being shaped to provide a trough portion spaced from the surface being wiped and into which trough contaminant particles may be swept and retained; means for generating magnetic lines of force in the area of said wiping contact to thereby attract particles subject to such force to the trough portion removed from the wiped area; wherein the means for generating magnetic lines of force comprise magnets distributed at intervals along the wiper, said magnets being embedded in the wiper, being elongate and having their axes parallel to the surface to be wiped.
Claim 3
Dependent Claim
134 words
An abrasive material entrapping wiper for circular hydraulic elements having reciprocatory motion comprising: a ring of resilient material having a contact surface engageable with anD slideable over a surface to be wiped; said ring being mountable upon a support surface with which the surface to be wiped has relative movement; the cross sectional configuration of said ring being shaped to provide a trough portion spaced from the surface being wiped and into which trough contaminant particles may be swept and retained; means for generating magnetic lines of force in the area of said wiping contact to thereby attract particles subject to such force to the trough portion removed from the wiped area; said wiper having a plurality of bleed holes located at intervals therearound to prevent buildup of a pressure differential across the wiper.
Claim 4
Dependent Claim
134 words
An abrasive material entrapping wiper for circular hydraulic elements having reciprocatory motion comprising: a ring of resilient material having a contact surface engageable with anD slideable over a surface to be wiped; said ring being mountable upon a support surface with which the surface to be wiped has relative movement; the cross sectional configuration of said ring being shaped to provide a trough portion spaced from the surface being wiped and into which trough contaminant particles may be swept and retained; means for generating magnetic lines of force in the area of said wiping contact to thereby attract particles subject to such force to the trough portion removed from the wiped area; said wiper having a plurality of bleed holes located at intervals therearound to prevent buildup of a pressure differential across the wiper.
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) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |