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US3694838A Expired / Lapsed US ⏱️ 0.0 years remaining

Apparatus for renewing damaged spark plug ports

Assignee: Phillips Screw Co
•
Filing: 1970-09-02
•
Granted: 1972-10-03
•
Expires: 1990-09-02
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Abstract

Abstract A tool for reworking spark plug ports in soft metal cylinder heads and comprising successive sections starting with a reduced extremity tapped to fit the original thread of the spark plug port, followed by two successive reamer sections of smaller and larger diameters, respectively, a tapered lead-in section, a tapping section and a third reamer section having a diameter larger than that of the tapping section to produce a countersink at the mouth of the spark plug port. Beyond the third reamer section the tool is provided with a hexagonal or other polygonal section for engagement by a wrench or the like. A separate handle portion having an internally threaded axial bore is provided for engaging the entering end of the reaming and tapping tool after the latter has penetrated through the cylinder head, which handle portion is provided with serrations surrounding the mouth of its axial bore and is counter-bored at the mouth to receive at least a part of the reamer section of the reaming and tapping tool.

Inventors

  • 👤 Leslie A Runton

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 00:57
CPC Classifications
H; H01; H01T; H01T13/00; H01T13/02; H01T13/08; B; B23; B23G; B23G5/00; B23G5/02; B23G5/06; B23P; B23P6/00; F; F02; F02F; F02F1/00; F02F1/24; F02F1/242; F02B; F02B1/00; F02B1/02; F02B1/04; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49718; Y10T29/49732; Y10T29/49744; Y10T408/00; Y10T408/60; Y10T408/62

Claims Analysis

Total Claims: 6
Claim 1
Independent Claim 122 words
A rotary tool for reworking sparkplug holes of soft metal cylinder heads, said tool comprising an elongated working part and a separate handle part, said working part having a toolengaging portion at one end, and a threaded handle-engaging portion at the other end, a reamer portion, for reaming a sparkplug hole to a larger size, adjacent said handle-engaging portion, and a tapping portion, for tapping the reamed-out sparkplug hole, between said reamer portion and said toolengaging portion, and said handle part having a threaded portion for engaging said handle-engaging portion of said working part, and a countersunk portion for receiving part of said reamer portion therein when the threaded handle-engaging portion is fully threaded into the threaded portion of said handle part.
Claim 2
Dependent Claim 122 words
A rotary tool for reworking sparkplug holes of soft metal cylinder heads, said tool comprising an elongated working part and a separate handle part, said working part having a toolengaging portion at one end, and a threaded handle-engaging portion at the other end, a reamer portion, for reaming a sparkplug hole to a larger size, adjacent said handle-engaging portion, and a tapping portion, for tapping the reamed-out sparkplug hole, between said reamer portion and said toolengaging portion, and said handle part having a threaded portion for engaging said handle-engaging portion of said working part, and a countersunk portion for receiving part of said reamer portion therein when the threaded handle-engaging portion is fully threaded into the threaded portion of said handle part.
Claim 3
Dependent Claim 37 words
A tool as defined in claim 1, said reamer portion comprising a first reamer section of relatively small diameter and a second reamer section of relatively larger diameter, said first reamer section being nearest said handle-engaging portion.
Claim 4
Dependent Claim 23 words
A tool as defined in claim 1, said working part having a second reamer portion between said tapping portion and said tool-engaging portion.
Claim 5
Dependent Claim 30 words
A tool as defined in claim 1, said handle-engaging portion consisting in an externally threaded cylindrical member and said handle part having an internally threaded depression to receive said member.
Claim 6
Dependent Claim 21 words
A tool as defined in claim 4, said handle part having a serrated ridge portion adjacent the mouth of said depression.

References Cited (Backward Citations)

CA627905A Cited
US938339A Cited
US1196415A Cited
US1334227A Cited
US2392133A Cited
US2948000A Cited
US3550173A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1975-10-03 1976-04-03 1976-10-03 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1979-10-03 1980-04-03 1980-10-03 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1983-10-03 1984-04-03 1984-10-03 $7700.00 Window Closed / Lapsed

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