US3694838A - Apparatus for renewing damaged spark plug ports - Google Patents

Apparatus for renewing damaged spark plug ports Download PDF

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Publication number
US3694838A
US3694838A US68975A US3694838DA US3694838A US 3694838 A US3694838 A US 3694838A US 68975 A US68975 A US 68975A US 3694838D A US3694838D A US 3694838DA US 3694838 A US3694838 A US 3694838A
Authority
US
United States
Prior art keywords
tool
reamer
section
handle
tapping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US68975A
Other languages
English (en)
Inventor
Leslie A Runton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Emhart Industries Inc
Emhart Enterprises Corp
Phillips Screw Co
Original Assignee
Phillips Screw Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Phillips Screw Co filed Critical Phillips Screw Co
Application granted granted Critical
Publication of US3694838A publication Critical patent/US3694838A/en
Assigned to EMHART CORPORATION reassignment EMHART CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). Assignors: MITE CORPORATION
Assigned to U.S.M. CORPORATION reassignment U.S.M. CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. AS OF DEC 31, 1986 Assignors: EMHART CORPORATION
Assigned to EMHART ENTERPRISES CORP. reassignment EMHART ENTERPRISES CORP. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: USM CORPORTION
Anticipated expiration legal-status Critical
Assigned to EMHART INDUSTRIES, INC. A CORP. OF CT. reassignment EMHART INDUSTRIES, INC. A CORP. OF CT. MERGER (SEE DOCUMENT FOR DETAILS). SEPTEMBER 23, 1987, CT. Assignors: EMHART ENTERPRISES CORP.
Assigned to EMHART ENTERPRISES CORP. reassignment EMHART ENTERPRISES CORP. CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). Assignors: USM CORPORATION
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01T—SPARK GAPS; OVERVOLTAGE ARRESTERS USING SPARK GAPS; SPARKING PLUGS; CORONA DEVICES; GENERATING IONS TO BE INTRODUCED INTO NON-ENCLOSED GASES
    • H01T13/00—Sparking plugs
    • H01T13/02—Details
    • H01T13/08—Mounting, fixing or sealing of sparking plugs, e.g. in combustion chamber
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23G—THREAD CUTTING; WORKING OF SCREWS, BOLT HEADS, OR NUTS, IN CONJUNCTION THEREWITH
    • B23G5/00—Thread-cutting tools; Die-heads
    • B23G5/02—Thread-cutting tools; Die-heads without means for adjustment
    • B23G5/06—Taps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P6/00—Restoring or reconditioning objects
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F1/00—Cylinders; Cylinder heads 
    • F02F1/24—Cylinder heads
    • F02F1/242—Arrangement of spark plugs or injectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B1/00—Engines characterised by fuel-air mixture compression
    • F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
    • F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49732—Repairing by attaching repair preform, e.g., remaking, restoring, or patching
    • Y10T29/49744—Screw threaded preform
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00—Cutting by use of rotating axially moving tool
    • Y10T408/60—Plural tool-assemblages
    • Y10T408/62—Coaxial

Definitions

  • Combs Attorney-Watson, Cole, Grindle & Watson 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.
  • Aseparate 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 providedwith 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.
  • a tool is presently available for reaming and tapping such damaged spark plug ports, which too] comprises an entering section of reduced diameter, provided with a thread similar to that of the spark plug originally installed in the damaged port.
  • the entering section is followed by a reaming section and a tapping section, and at the end opposite the entering section the tool is provided with a polygonal section for engagement by a wrench or the like for rotating the tool.
  • the tool just described can not be satisfactorily employed as the original thread of the port is needed to pull the tool through the port. If an end thrust is applied to force the tool through the port the tool is caused to wobble, causing it to ream out a hole of irregular shape and somewhat larger than intended with the result that the insert, when installed, is loose and can not satisfactorily contain the combustion gases.
  • the reaming section of the working part consists of two reamers of smaller and larger diameters, respectively, so that the reaming action requires less torque than is required in using the tool heretofore available.
  • the reamer section of the working part is followed by a tapered lead-in section and a tapping section, which in turn is followed by a further reamer section for producing a countersink at the mouth of the spark plug hole or port, to receive the head flange of a hard metal insert.
  • the outer end of the working part is provided with a polygonal section for engagement by a wrench or the like.
  • FIG. 1 is an exploded side view of a tool in accordance with the invention, the handle portion shown partly in axial section;
  • FIG. 2 is a sectional view through a cylinder head showing the tool of FIG. 1 in use;
  • FIG. 3 is an exploded fragmentary sectional view through the spark plug port of FIG. 2 after reworking, and showing an insert about to be installed therein.
  • the tool of the present invention comprises a working part 10 and a handle 1 l, the latter being preferably cylindrical in shape and having an axial bore 12 which is internally threaded as at 13.
  • the diameter of the bore 12 and character of the thread 13 correspond to the diameter and thread of the spark plug port which is to be reworked.
  • the mouth of the bore 12 is countersunk as at 14 and surrounded by a serrated rim 15.
  • the working part 10 of the tool is divided by flutes 16 into four equally spaced, identicalwings 17 which perform the reaming and tapping operation as described, the outer edge of each wing 17 being, of course, generally arcuate in plan.
  • the lowermost or en- ,tering end 18 of each wing 17 is provided with a thread 19 adapted to mate with the thread 13 of the handle portion 11 and, therefor, corresponding to the thread of the spark plug originally installed in the spark plug port to be reworked.
  • Above the thread 19 each wing 17 is provided with a reamer portion comprising separate reamer sections 20 and 21 of smaller and larger diameters, respectively.
  • each wing is provided with a tapered section 22 serving as a lead-in to a tapping thread 23 of increasing diameter, the upper turns of which correspond in diameter to the crest diameter of the external thread of the hard metal insert which is to be installed in the spark plug port.
  • a tapping thread 23 each wing of the work part is provided with a reamer section 24 of such diameter as to form, at the mouth of the spark plug port, a countersink adapted to receive a head flange of the aforementioned insert.
  • the head of the working part 10 preferably comprises a short cylindrical portion 25 surmounted by a hexagonal or other polygonal section 26 adapted for engagement by a wrench or other tool for turning the working part 10.
  • the entering end 18 of the working part 10 is threaded into and through the damaged spark plug port and as the extremity of the entering end protrudes into the interior of the cylinder head it is threaded into the bore 12 of the handle part 11.
  • the serrations 15 at the mouth of the bore 12 contact the inner surface of the cylinder head and restrain the handle part 11 from turning, thus the thread 13 of the handle part serves to draw the working part 10 into the spark plug port as the working part 10 is rotated.
  • the reamer section 20 is caused to remove the damaged thread of the spark plug after which the reamer section 21 enlarges the hole to the crest diameter of the new thread to be tapped into the port.
  • the lead-in section 22 and tapping section 23 then enter the spark plug port and the tapping is performed, after which the reamer portion 24 forms the countersink 27 (FIG. 3) at the mouth of the spark plug port.
  • the mouth of the handle part 11 is provided with a countersink 14 of a diameter to receive the reamer section 20, thus permitting the reamer section 21 to pass completely through the hole, preparing it for tapping, before the tapping operation begins. For this reason, and because the reaming operation is performed in two steps, the tool of the present invention requires the use of considerably less torque than is necessary to perform the same operation using tools heretofore available.
  • the working part will be drawn into the work by the partially tapped thread but, if necessary, this phase of the operation may be assisted by exerting tension upon the handle portion 1 1 during completion of the tapping operation and reaming of the countersink 27 at the mouth of the spark plug port.
  • the tool is removed from the reworked port and a hard metal insert 28 (FIG. 3), for example of the Kelox type, is installed in the port, the insert 28 having an internally threaded bore adapted to receive a new spark plug of the type originally installed.
  • a hard metal insert 28 for example of the Kelox type
  • a rotary tool for reworking sparkplug holes of soft metal cylinder heads comprising an elongated 3o working part and a separate handle part, said working part having a tool-engaging portion at one end, and a threaded handle-engaging portion at the otherend, a reamer portion, for reaming a spark-plug 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.
  • 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.
  • said handle-engaging portion consisting in an externally threaded cylindrical member and said handle part having an internally threaded depression to receive said member.
  • a tool as defined in claim 4 said handle part having a serrated ridge portion adjacent the mouth of said depression.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • General Engineering & Computer Science (AREA)
  • Spark Plugs (AREA)
  • Drilling And Boring (AREA)
US68975A 1970-09-02 1970-09-02 Apparatus for renewing damaged spark plug ports Expired - Lifetime US3694838A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US6897570A 1970-09-02 1970-09-02

Publications (1)

Publication Number Publication Date
US3694838A true US3694838A (en) 1972-10-03

Family

ID=22085893

Family Applications (1)

Application Number Title Priority Date Filing Date
US68975A Expired - Lifetime US3694838A (en) 1970-09-02 1970-09-02 Apparatus for renewing damaged spark plug ports

Country Status (5)

Country Link
US (1) US3694838A (enrdf_load_stackoverflow)
CA (1) CA931305A (enrdf_load_stackoverflow)
DE (1) DE2143151C3 (enrdf_load_stackoverflow)
FR (1) FR2107116A5 (enrdf_load_stackoverflow)
GB (1) GB1303404A (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869219A (en) * 1972-10-30 1975-03-04 Robert Neil Wilson Drill screw
US4103762A (en) * 1976-02-20 1978-08-01 Sawyer Thomas C Method and device for repairing damaged bleeder valve apertures
US4218811A (en) * 1976-02-20 1980-08-26 Sawyer Thomas C Method for repairing damaged bleeder valve apertures
US4229867A (en) * 1978-06-16 1980-10-28 Spencer Heads, Inc. Method of repairing or modifying the firing deck of an internal combustion engine
US5259706A (en) * 1992-08-31 1993-11-09 Eugene Gaut Thread repairing tools
US6176653B1 (en) * 1999-09-07 2001-01-23 Thomas Crochet Electrical fitting tap
US6474285B2 (en) * 2001-02-23 2002-11-05 Tansil L. Phillips Method of repairing a damaged spark plug hole
US20030215296A1 (en) * 2002-05-20 2003-11-20 Botelle John D. Method, kit and insert for replacing damaged threads
US6668784B1 (en) * 2002-11-20 2003-12-30 Gary Sellers Threaded insert for tapered seat spark plug bores, installation tools, and method of installation
US20050111931A1 (en) * 2003-03-14 2005-05-26 Hool Patrick H. Clinched thread saver
US20060260110A1 (en) * 2005-05-23 2006-11-23 Horst Klann Tool system for replacing a glow plug of a diesel engine
US20160258406A1 (en) * 2013-07-19 2016-09-08 Cummins Inc. Method of repairing a cracked head using an injector bore insert
CN109153089A (zh) * 2016-07-13 2019-01-04 奥迪股份公司 用于制造螺纹孔的方法及刀具

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8407891B2 (en) * 2008-10-15 2013-04-02 GM Global Technology Operations LLC Method for providing a controlled spark plug orientation in an engine structure

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US938339A (en) * 1904-05-26 1909-10-26 Carl F Reisenweber Tool.
US1196415A (en) * 1916-01-25 1916-08-29 Jacob Abrahamson Implement for truing up threads.
US1334227A (en) * 1918-08-02 1920-03-16 Chauncey D Chelcut Nut-lock
US2392133A (en) * 1940-05-18 1946-01-01 Elmer M Naylor Rivet
US2948000A (en) * 1957-05-28 1960-08-09 James H Borland Refinishing tool for tapped hole and seat
CA627905A (en) * 1961-09-26 H. Carroll Fred Internal thread repair device
US3550173A (en) * 1969-02-13 1970-12-29 Gawlik Paul A Sen Self-aligning taps

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA627905A (en) * 1961-09-26 H. Carroll Fred Internal thread repair device
US938339A (en) * 1904-05-26 1909-10-26 Carl F Reisenweber Tool.
US1196415A (en) * 1916-01-25 1916-08-29 Jacob Abrahamson Implement for truing up threads.
US1334227A (en) * 1918-08-02 1920-03-16 Chauncey D Chelcut Nut-lock
US2392133A (en) * 1940-05-18 1946-01-01 Elmer M Naylor Rivet
US2948000A (en) * 1957-05-28 1960-08-09 James H Borland Refinishing tool for tapped hole and seat
US3550173A (en) * 1969-02-13 1970-12-29 Gawlik Paul A Sen Self-aligning taps

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3869219A (en) * 1972-10-30 1975-03-04 Robert Neil Wilson Drill screw
US4103762A (en) * 1976-02-20 1978-08-01 Sawyer Thomas C Method and device for repairing damaged bleeder valve apertures
US4218811A (en) * 1976-02-20 1980-08-26 Sawyer Thomas C Method for repairing damaged bleeder valve apertures
US4229867A (en) * 1978-06-16 1980-10-28 Spencer Heads, Inc. Method of repairing or modifying the firing deck of an internal combustion engine
US5259706A (en) * 1992-08-31 1993-11-09 Eugene Gaut Thread repairing tools
US6176653B1 (en) * 1999-09-07 2001-01-23 Thomas Crochet Electrical fitting tap
US6474285B2 (en) * 2001-02-23 2002-11-05 Tansil L. Phillips Method of repairing a damaged spark plug hole
US20030215296A1 (en) * 2002-05-20 2003-11-20 Botelle John D. Method, kit and insert for replacing damaged threads
US6668784B1 (en) * 2002-11-20 2003-12-30 Gary Sellers Threaded insert for tapered seat spark plug bores, installation tools, and method of installation
US20050111931A1 (en) * 2003-03-14 2005-05-26 Hool Patrick H. Clinched thread saver
US20060260110A1 (en) * 2005-05-23 2006-11-23 Horst Klann Tool system for replacing a glow plug of a diesel engine
EP1726405A1 (de) * 2005-05-23 2006-11-29 Klann Spezial-Werkzeugbau GmbH Werkzeugsystem zum Austauschen einer Glühkerze eines Dieselmotors
US7484281B2 (en) * 2005-05-23 2009-02-03 Klann Spezial-Werkzeugbau Gmbh Tool system for replacing a glow plug of a diesel engine
US20160258406A1 (en) * 2013-07-19 2016-09-08 Cummins Inc. Method of repairing a cracked head using an injector bore insert
US9976530B2 (en) * 2013-07-19 2018-05-22 Cummins Inc. Method of repairing a cracked head using an injector bore insert
CN109153089A (zh) * 2016-07-13 2019-01-04 奥迪股份公司 用于制造螺纹孔的方法及刀具
US10596647B2 (en) 2016-07-13 2020-03-24 Audi Ag Method for producing a threaded hole

Also Published As

Publication number Publication date
DE2143151C3 (de) 1975-07-03
GB1303404A (enrdf_load_stackoverflow) 1973-01-17
FR2107116A5 (enrdf_load_stackoverflow) 1972-05-05
CA931305A (en) 1973-08-07
DE2143151A1 (de) 1972-03-16
DE2143151B2 (de) 1974-11-21

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Legal Events

Date Code Title Description
AS Assignment

Owner name: EMHART CORPORATION,STATELESS

Free format text: MERGER;ASSIGNOR:MITE CORPORATION;REEL/FRAME:004837/0814

Effective date: 19870601

Owner name: EMHART CORPORATION

Free format text: MERGER;ASSIGNOR:MITE CORPORATION;REEL/FRAME:004837/0814

Effective date: 19870601

AS Assignment

Owner name: U.S.M. CORPORATION

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. AS OF DEC 31, 1986;ASSIGNOR:EMHART CORPORATION;REEL/FRAME:004820/0940

Effective date: 19880128

AS Assignment

Owner name: EMHART ENTERPRISES CORP.,STATELESS

Free format text: CHANGE OF NAME;ASSIGNOR:USM CORPORTION;REEL/FRAME:004954/0699

Effective date: 19871216

Owner name: EMHART ENTERPRISES CORP.

Free format text: CHANGE OF NAME;ASSIGNOR:USM CORPORTION;REEL/FRAME:004954/0699

Effective date: 19871216

AS Assignment

Owner name: EMHART INDUSTRIES, INC. A CORP. OF CT.

Free format text: MERGER;ASSIGNOR:EMHART ENTERPRISES CORP.;REEL/FRAME:005175/0481

Effective date: 19870911

AS Assignment

Owner name: EMHART ENTERPRISES CORP., CONNECTICUT

Free format text: CHANGE OF NAME;ASSIGNOR:USM CORPORATION;REEL/FRAME:005181/0602

Effective date: 19870505