US3686607A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency shield for spark plug boot having suppression coil therein
Assignee: Murphy Industries Inc
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Filing: 1971-02-05
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Granted: 1972-08-22
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Expires: 1991-02-05
Abstract
Abstract A high frequency shield for use with a spark plug lead having an electrical discharge suppression coil interposed between the plug and the end of the lead and contained within a portion of the spark plug boot for confining electrical emissions emanating from the suppression coil to an area within the limits of the shield. The shield employs a support member adapted to be positioned over the grounded metallic body portion of the plug while a metallic electrical emission controlling screen is held in surrounding relationship to the segment of the boot containing the suppression coil therein by an elongated, rigid, combination support strip and grounding element extending between the shielding screen and the base member. The support strip is adapted to be bent from its normal straight-line configuration to a right-angle configuration to enable the shield to be used on conjunction with either the conventional, straight type spark plug boot or the right-angle type boot.
Inventors
- 👤 Norman H Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:21
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/04; H01T13/05
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
131 words
For use with electrical ignition apparatus having a spark plug provided with a transversely polygonal, grounded body portion, a boot assembly normally coupled to said plug, and an electrical discharge suppression coil mounted within a segment of the boot, a unit for suppressing high frequency emissions from the coil comprising: grounding means adapted to be mounted on said body portion of the plug in electrical contact therewith; high frequency shielding means configured to be disposed in confining relationship to said segment of the boot and said coil without enclosing the remainder of the boot; and connecting means supporting the shielding means on said grounding means and maintaining the latter in said emission confining relationship to the coil for suppressing discharge of said high frequency emissions therefrom during firing of the plug.
Claim 2
Dependent Claim
131 words
For use with electrical ignition apparatus having a spark plug provided with a transversely polygonal, grounded body portion, a boot assembly normally coupled to said plug, and an electrical discharge suppression coil mounted within a segment of the boot, a unit for suppressing high frequency emissions from the coil comprising: grounding means adapted to be mounted on said body portion of the plug in electrical contact therewith; high frequency shielding means configured to be disposed in confining relationship to said segment of the boot and said coil without enclosing the remainder of the boot; and connecting means supporting the shielding means on said grounding means and maintaining the latter in said emission confining relationship to the coil for suppressing discharge of said high frequency emissions therefrom during firing of the plug.
Claim 3
Dependent Claim
14 words
The invention of claim 1, wherein said shielding means comprises a tubular shield element.
Claim 4
Dependent Claim
14 words
The invention of claim 2, wherein said shield element is constructed of screen material.
Claim 5
Dependent Claim
175 words
For use with electrical ignition apparatus having a spark plug provided with a transversely polygonal, grounded body portion, and a boot assembly normally coupled to said plug and provided with an electrical discharge suppression coil therein, a unit for suppressing high frequeNcy emissions from the coil comprising: grounding means adapted to be mounted on said body portion of the plug in electrical contact therewith, said grounding means comprising a tubular, metallic member having sidewalls which define a polygonal passage therethrough adapted to complementally engage the body portion of said plug, said member being adapted to be mounted on said plug by sliding said member over said body portion of said plug with the polygonal portion of the latter at least partially received within said passage; high frequency shielding means configured to be disposed in confining relationship to said coil; and connecting means supporting the shielding means on said grounding means and maintaining the latter in said confining relationship to the coil for suppressing discharge of said high frequency emissions therefrom during firing of the plug.
Claim 6
Dependent Claim
175 words
For use with electrical ignition apparatus having a spark plug provided with a transversely polygonal, grounded body portion, and a boot assembly normally coupled to said plug and provided with an electrical discharge suppression coil therein, a unit for suppressing high frequeNcy emissions from the coil comprising: grounding means adapted to be mounted on said body portion of the plug in electrical contact therewith, said grounding means comprising a tubular, metallic member having sidewalls which define a polygonal passage therethrough adapted to complementally engage the body portion of said plug, said member being adapted to be mounted on said plug by sliding said member over said body portion of said plug with the polygonal portion of the latter at least partially received within said passage; high frequency shielding means configured to be disposed in confining relationship to said coil; and connecting means supporting the shielding means on said grounding means and maintaining the latter in said confining relationship to the coil for suppressing discharge of said high frequency emissions therefrom during firing of the plug.
Claim 7
Dependent Claim
45 words
The invention of claim 4, wherein said connecting means comprises a metallic strip interconnecting said tubular member and said shielding means, said strip being in at least partial circumscribing relationship to said spark plug boot assembly when said tubular member is mounted on said plug.
Claim 8
Dependent Claim
68 words
The invention of claim 4, said sidewalls being configured to define a polygonal passage therethrough of slightly less overall size than the cross-sectional shape of the body portion of the plug and said sidewall having a break therein whereby the member may be positioned over said body portion of the plug in tight frictional engagement therewith as the edges of the sidewalls defining said break spread apart relatively.
Claim 9
Dependent Claim
35 words
The invention of claim 6, said shielding means comprising a tubular, metallic, screen element, and said connecting means comprising an elongated, metallic strip interconnecting a portion of one side of said member with said element.
Claim 10
Dependent Claim
38 words
The invention of claim 7, wherein said strip is adapted to be bent into a selected configuration in order to dispose said screen element in the proper position for use with plug boots of other than straight-line configuration.
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |