US3099456A - Thread forming sparkplug gaskets - Google Patents

Thread forming sparkplug gaskets Download PDF

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US3099456A
US3099456A US46540A US4654060A US3099456A US 3099456 A US3099456 A US 3099456A US 46540 A US46540 A US 46540A US 4654060 A US4654060 A US 4654060A US 3099456 A US3099456 A US 3099456A
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gasket
spark plug
shank
plug
compression
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Harold P Hopp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
    • F16J15/08—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing
    • F16J15/0887—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with exclusively metal packing the sealing effect being obtained by elastic deformation of the packing
    • 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
    • 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
    • Y10T29/49826—Assembling or joining
    • Y10T29/49908—Joining by deforming
    • Y10T29/49925—Inward deformation of aperture or hollow body wall
    • Y10T29/49934—Inward deformation of aperture or hollow body wall by axially applying force

Definitions

  • the present disclosure relates to a gasket of this -type which may be slipped over a threaded cylindrical portion, but which upon the tightening of the plug Within a cylinder head will mainltain itself upon the threaded portion in such manner that cross threading may occur with respect to the threads on the plug, so that the gasket may be manually unthreaded from the plug when desired, but which will maintain itself upon -the plug until intentionally removed.
  • Spark plug gaskets in (the prior art, have been of a deformable type, usually stamped from copper or copperplated steel. When a spark plug is engaged Within a cylinder head, the gasket is deformed under compression to effect a seal between the spark plug and the cylinder head. Upon removal of the spark plug for cleaning or replacement, the conventional gasket has usually remained on the exposed surface of the cylinder head, necessitating separate removal before a new gasket may be employed to seal the replaced plug.
  • Another object of the invention lies in the provision of a spark plug gasket of the type ⁇ described which may be initially engaged upon the threaded cylindrical portion of a spark plug without the necessity of a manual lthreading operation, and in which during the engagement of the plug with a cylinder head, the deformation of the gasket will be such as to reduce the internal diameter of the same to a point where it is less than the outside diameter of the threaded cylindrical portion ⁇ of the plug, but which may be cross threaded as a manual operation to permit the gasket to be twisted from engagement with the plug Without damage to either gasket or plug.
  • a further object Iof the invention lies in the provision of improved self-locking spark plug gasket construction in which the cost of fabrication may be directly comparable with that of constructions existing in the art, thereby permitting consequent wide sale, distribution and use.
  • a feature of the invention lies in the improved sealing action which is obtained by the gasket construction contemplated by the present invention, as contrasted with prior art devices.
  • FIGURE 1 is a View in elevation of a first embodiment of ythe invention.
  • FIGURE 2 is a fragmentary sectional view showing the rst embodiment in position upon a conventional spark plug 'and prior Ito installation of the spark plug upon a cylinder head.
  • FIGURE 3 is a similar sectional view showing the spark plug in installed condition.
  • FIGURE 4 is Ia fragmentary view in elevation, partly in section, showing the threaded removal of the first embodiment after use.
  • FIGURE 5 is a fragmentary view in elevation showing the same in deformed condition.
  • FIGURE 6 is a transverse sectional view as seen from the plane 6 6 in FIGURE 5
  • FIGURE 7 is a view in elevation corresponding to that seen in FIGURE 5, but showing a second embodiment of the invention.
  • FIGURE 8 is a ⁇ side elevational view thereof as seen from the plane 8 3 in FIGURE 7.
  • FIGURE 9 is an enlarged fragmentary sectional view as seen from the plane 9 9 in FIGURE 8.
  • the device is employed in conjunction with a conventional spark plug 11 having a metallic body l2 including an upper cylindrical member 13 and a lower threaded cylindrical member 14 which ⁇ supports. a conventional electrode 15.
  • the continuous thread 16 extends upwardly along the member 14, and meets the upper cylindrical member 13 in a tapered fillet IS.
  • the spark plug is engageable upon a cylinder head I9 having a cup-like recess Ztl, there being a threaded bore Z1 positioned in the center of the recess Ztl.
  • the bore 21 is provided with an upper chamfered portion 22, usually not corresponding in taper to that of the fillet 18.
  • the tapered fillet 18 is omitted, and in such case the device lil may be installed in a position inverted from that seen in FIGURES 2 to 4, inclusive, in the drawing.
  • the device I0 in initial or undistorted form, includes an outer peripheral edge surface 25, an inner peripheral edge surface 26, an upper surface 27 and a lower surface 28.
  • the device 10 is preferably formed using a series of progressive stamping dies, as is well known in the art, and includes a rst or outer sealing portion 30, a second sealing portion 31, ⁇ a third sealing portion 32 and an inner angularly disposed flange 33.
  • the last-mentioned flange 33 is provided with a plurality of radially extending slots 35 forming individual segmented portions 36.
  • the segments 35 may be given a degree of twist about an axis angularly disposed with respect to the normal axis of compression of the gasket, forming non-continuous segments in the edge surface 26 (see FIGURE S).
  • the twisting operation may be omitted, and the segments 36 may be permitted to .acquire a similar conguration upon the unthreading manual movement imparted by the user in -removal of the gasket from the plug.
  • the mating surfaces Hatten the undulations formed by the sealing portions 30-32 to effect a seal ⁇ at each crest thereof. Because of the pitch of the undulations, metal is caused to ilow both centrifugally and centripetally, resulting in a reduction of the inner diameter thereof. Since the initial inner diameter prior to compression is just sulieient to clear the major diameter of the thread 16, upon compression the flange 33 is reduced in inner diameter to a point where the same lies between the major and minor diameters of the thread 16.
  • the device Upon removal of the spark plug with respect to the cylinder head, as indicated in FIGURE 4, the device can be caused to take on a thread corresponding in pitch to that of the thread 16 owing to the angular disposition of the non-continuous edge 26.
  • This operation requires some manual effort, as the thread is actually formed at the time the gasket is removed, which assures that the gasket will remain upon the plug during the period in which the plug is removed from engagement with the cylinder head.
  • the lsecond embodiment differs from the first embodiment in the provision of a plurality of raised projections 39 and alternately spaced depressed projections 40' situated .adjacent the slots 135. In the undeformed state, it is not necessary that the edge 126 be placed in non-planar condition, this occurring when the plug is tightened within the cylinder head and pressure is brought to bear upon the projections 39 and 40 which cause the individual segments to assume ⁇ a disposition corresponding to that seen in FIGURE 6.
  • a spark plug having a threaded shank, and a compressible annular gasket having a principal axis of compression; said gasket including a plurality of undulating sealing portions, and an inner flange having at least one radially arranged slot therein forming a segmented inner edge, said inner llange disposed in angular Contact relation with respect to said axis of compression, so that opposite sides of said inner flange are in deformable contacting engagement with opposed surfaces, said inner edge having a diameter which is substantially greater than the major diameter of lsaid threaded shank when said gasket is in a relatively uncompressed state, and suhstantially less than said major diameter when in lrelatively compressed state; whereby said gasket may be slipped upon said shank of said spark plug with a purely translational motion, and may become threadedly aixed to said shank upon the installation and tightening of said spark plug wherein said gasket is compressed.
  • a spark plug having a threaded shank, and a compressible annular gasket having a principal axis of compression; said gasket including a plurality yof undulating sealing portions, and an inner flange having a plurality of radially arranged slots therein forming ⁇ a segmented inner edge, said inner llange disposed in angular contact relation with respect to said axis of compression, so that opposite sides of said inner flange are in deformable contacting engagement with opposed surfaces, said inner edge having a diameter which is substantially greater .than the major diameter rof said threaded shank when said gasket is in a relatively uncompressed state, and substantially -less than said major diameter when in relatively compressed state; whereby said gasket may be slipped upon said shank of said spark plug with a purely rtranslational motion, and may become threadedly allixed to said shank upon the installation and tightening of said spark plug wherein said gasket is compressed.
  • a spark plug having a threaded shank, and an annular compressible gasket therefor; said gasket having a principal 'axis of compression, a plurality of undulating sealing portions, and an inner flange disposed in angular relation with respect to said axis of compression, said inner lange having at least one radially arranged slot therein forming a segmented inner edge, said inner flange disposed in angular contact relation with respect to said axis of compression, so that opposite sides of said inner flange are in deformable contacting engagement with opposed surfaces, said inner flange having first and second projections thereon extending outwardly in opposite directions from the plane of said inner llange; said inner edge having a diameter substantially greater than the major diameter of said -threaded shank when said gasket is in relatively uncompressed condition, and a diameter substantially less than said major diameter of said threaded shank when in relatively compressed condition; whereby said gasket may be slipped upon said shank of said spark plug with a

Description

July 30, 1963 H. P. HoPP 3,099,456
THREAD FORMING SPARKPLUG GAsxETs Filed Aug. 1. 1960 2f l. if
United States Patent O 3,099,456 THREAD FORMING SPARKPLUG GASKET Harold I. Hopp, 374 Lantana Ave., Englewood, NJ. Filed Aug. 1, 1960, Ser. No. 46,540 Claims. (Cl. 277-166) This invention relates generally to sealing gaskets, and more particularly to an improved spark plug gasket of a self-locking type.
In my co-pending application, Serial No. 21,317, filed April 1l, 1960, entitled Self-Locking Spark Plug Gaskets, there is disclosed a spark plug `gasket which may be slipped over a threaded cylindrical portion at the lower end of the spark plug, and which will permanently secure itself upon the plug once the plug has been tightened within a -threaded spark plug opening in a cylinder head of an internal combustion engine. The present disclosure relates to a gasket of this -type which may be slipped over a threaded cylindrical portion, but which upon the tightening of the plug Within a cylinder head will mainltain itself upon the threaded portion in such manner that cross threading may occur with respect to the threads on the plug, so that the gasket may be manually unthreaded from the plug when desired, but which will maintain itself upon -the plug until intentionally removed.
Spark plug gaskets, in (the prior art, have been of a deformable type, usually stamped from copper or copperplated steel. When a spark plug is engaged Within a cylinder head, the gasket is deformed under compression to effect a seal between the spark plug and the cylinder head. Upon removal of the spark plug for cleaning or replacement, the conventional gasket has usually remained on the exposed surface of the cylinder head, necessitating separate removal before a new gasket may be employed to seal the replaced plug.
In recent years, the wide use of overhead valve type internal `combustion engines has made the replacement of spark plugs a far more diflicult operation than has heretofore been the case. In many cases, the spark plug opening in the head is completely concealed from view of the mechanic, and the spark plug and attached gasket must be manually inserted blindly into the proper opening using the fingers of one hand. Such operations have resulted in the loss `of gaskets prior to engagement of the spark plug with the opening inthe cylinder head, and, in some instances, the replacement of a spark plug with a new gasket disposed upon an old one, sol that the spark plug does not become properly seated with respect to the combustion chamber.
Attempts have ybeen made `to provide so-called screwon type gaskets having projections or a continuous thread thereon which permit the gasket to be threadedly engaged upon the lower cylindrical portion of the spark plug body, so that the same will remain in proper position during the engagement of the spark plug with 'the cylinder head. While such construction has been adequate to maintain the gasket upon the spark plug during such engagement, it has tended to remain in place upon the cylinder head when the spark plug is unscrewed, owing to the cementing action'of rust, corrosion and the like which normally occurs While Athe spark plug is in service. Such devices have had an added disadvantage in that a separate operation, that of threading the gasket upon the plug, is necessary before the plug may be installed.
It is lamong hte principal objects of the present invention to provide an improved self-locking gasket which may be conveniently installed upon la spark plug and which will remain positively interconnected with the same during removal of the spark plug from the cylinder head, but which nevertheless may be manual-ly removed when desired once the spark plug has been disconnected from the cylinder head.
ICC
Another object of the invention lies in the provision of a spark plug gasket of the type `described which may be initially engaged upon the threaded cylindrical portion of a spark plug without the necessity of a manual lthreading operation, and in which during the engagement of the plug with a cylinder head, the deformation of the gasket will be such as to reduce the internal diameter of the same to a point where it is less than the outside diameter of the threaded cylindrical portion `of the plug, but which may be cross threaded as a manual operation to permit the gasket to be twisted from engagement with the plug Without damage to either gasket or plug.
A further object Iof the invention lies in the provision of improved self-locking spark plug gasket construction in which the cost of fabrication may be directly comparable with that of constructions existing in the art, thereby permitting consequent wide sale, distribution and use.
A feature of the invention lies in the improved sealing action which is obtained by the gasket construction contemplated by the present invention, as contrasted with prior art devices.
'llhese objects and features, as Well as other incidental ends and advantages, will more fully appear in the progress of the following disclosure, and be pointed out in the appended claims.
In the drawing, to which reference will be made in the specication, similar reference characters have been employed to designate corresponding parts throughout the several views.
FIGURE 1 is a View in elevation of a first embodiment of ythe invention.
FIGURE 2 is a fragmentary sectional view showing the rst embodiment in position upon a conventional spark plug 'and prior Ito installation of the spark plug upon a cylinder head.
FIGURE 3 is a similar sectional view showing the spark plug in installed condition.
FIGURE 4 is Ia fragmentary view in elevation, partly in section, showing the threaded removal of the first embodiment after use.
FIGURE 5 is a fragmentary view in elevation showing the same in deformed condition.
FIGURE 6 is a transverse sectional view as seen from the plane 6 6 in FIGURE 5 FIGURE 7 is a view in elevation corresponding to that seen in FIGURE 5, but showing a second embodiment of the invention.
FIGURE 8 is a `side elevational view thereof as seen from the plane 8 3 in FIGURE 7.
FIGURE 9 is an enlarged fragmentary sectional view as seen from the plane 9 9 in FIGURE 8.
In accordance with the invention, the device, generally indicated by reference character itl, is employed in conjunction With a conventional spark plug 11 having a metallic body l2 including an upper cylindrical member 13 and a lower threaded cylindrical member 14 which `supports. a conventional electrode 15. The continuous thread 16 extends upwardly along the member 14, and meets the upper cylindrical member 13 in a tapered fillet IS. The spark plug is engageable upon a cylinder head I9 having a cup-like recess Ztl, there being a threaded bore Z1 positioned in the center of the recess Ztl. The bore 21 is provided with an upper chamfered portion 22, usually not corresponding in taper to that of the fillet 18. In certain cases, the tapered fillet 18 is omitted, and in such case the device lil may be installed in a position inverted from that seen in FIGURES 2 to 4, inclusive, in the drawing.
Referring to FIGURES 1 and 2, in initial or undistorted form, the device I0 includes an outer peripheral edge surface 25, an inner peripheral edge surface 26, an upper surface 27 and a lower surface 28. The device 10 is preferably formed using a series of progressive stamping dies, as is well known in the art, and includes a rst or outer sealing portion 30, a second sealing portion 31, `a third sealing portion 32 and an inner angularly disposed flange 33. As best seen in FIGURE 5, the last-mentioned flange 33 is provided with a plurality of radially extending slots 35 forming individual segmented portions 36. During the forming operation, the segments 35 may be given a degree of twist about an axis angularly disposed with respect to the normal axis of compression of the gasket, forming non-continuous segments in the edge surface 26 (see FIGURE S).
`In the alternative, the twisting operation may be omitted, and the segments 36 may be permitted to .acquire a similar conguration upon the unthreading manual movement imparted by the user in -removal of the gasket from the plug.
Upon installation as seen .in FIGURE 3, the mating surfaces Hatten the undulations formed by the sealing portions 30-32 to effect a seal `at each crest thereof. Because of the pitch of the undulations, metal is caused to ilow both centrifugally and centripetally, resulting in a reduction of the inner diameter thereof. Since the initial inner diameter prior to compression is just sulieient to clear the major diameter of the thread 16, upon compression the flange 33 is reduced in inner diameter to a point where the same lies between the major and minor diameters of the thread 16.
Upon removal of the spark plug with respect to the cylinder head, as indicated in FIGURE 4, the device can be caused to take on a thread corresponding in pitch to that of the thread 16 owing to the angular disposition of the non-continuous edge 26. This operation requires some manual effort, as the thread is actually formed at the time the gasket is removed, which assures that the gasket will remain upon the plug during the period in which the plug is removed from engagement with the cylinder head.
Turning now to the second embodiment of the invention, as illustrated in FIGURES 7, 8 and 9, parts corresponding to those of the rst embodiment have been designated by similar reference characters with the additional pre-X 1.
The lsecond embodiment differs from the first embodiment in the provision of a plurality of raised projections 39 and alternately spaced depressed projections 40' situated .adjacent the slots 135. In the undeformed state, it is not necessary that the edge 126 be placed in non-planar condition, this occurring when the plug is tightened within the cylinder head and pressure is brought to bear upon the projections 39 and 40 which cause the individual segments to assume `a disposition corresponding to that seen in FIGURE 6.
I wish it to be understood that I do not consider the invention limited to the precise details of structure shown and set forth in this specification, for obvious modifications will occur to those skilled in the art to which the invention pertains.
I claim:
1. In combination, a spark plug having a threaded shank, and a compressible annular gasket having a principal axis of compression; said gasket including a plurality of undulating sealing portions, and an inner flange having at least one radially arranged slot therein forming a segmented inner edge, said inner llange disposed in angular Contact relation with respect to said axis of compression, so that opposite sides of said inner flange are in deformable contacting engagement with opposed surfaces, said inner edge having a diameter which is substantially greater than the major diameter of lsaid threaded shank when said gasket is in a relatively uncompressed state, and suhstantially less than said major diameter when in lrelatively compressed state; whereby said gasket may be slipped upon said shank of said spark plug with a purely translational motion, and may become threadedly aixed to said shank upon the installation and tightening of said spark plug wherein said gasket is compressed.
2. In combination, a spark plug having a threaded shank, and a compressible annular gasket having a principal axis of compression; said gasket including a plurality yof undulating sealing portions, and an inner flange having a plurality of radially arranged slots therein forming `a segmented inner edge, said inner llange disposed in angular contact relation with respect to said axis of compression, so that opposite sides of said inner flange are in deformable contacting engagement with opposed surfaces, said inner edge having a diameter which is substantially greater .than the major diameter rof said threaded shank when said gasket is in a relatively uncompressed state, and substantially -less than said major diameter when in relatively compressed state; whereby said gasket may be slipped upon said shank of said spark plug with a purely rtranslational motion, and may become threadedly allixed to said shank upon the installation and tightening of said spark plug wherein said gasket is compressed.
3. Structure as set forth in claim 2 in which the individual segments of said inner edge are disposed in mutually non-planar relation. j
4. Structure in accordance with claim 2 in which said inner flanges is provided with first and second projections extending outwardly in opposite directions from the planes of said inner flanges.
5. In combination, a spark plug having a threaded shank, and an annular compressible gasket therefor; said gasket having a principal 'axis of compression, a plurality of undulating sealing portions, and an inner flange disposed in angular relation with respect to said axis of compression, said inner lange having at least one radially arranged slot therein forming a segmented inner edge, said inner flange disposed in angular contact relation with respect to said axis of compression, so that opposite sides of said inner flange are in deformable contacting engagement with opposed surfaces, said inner flange having first and second projections thereon extending outwardly in opposite directions from the plane of said inner llange; said inner edge having a diameter substantially greater than the major diameter of said -threaded shank when said gasket is in relatively uncompressed condition, and a diameter substantially less than said major diameter of said threaded shank when in relatively compressed condition; whereby said gasket may be slipped upon said shank of said spark plug with a purely translational motion, and may become threadedly yaffixed to said shank upon the installation and tightening of said spark plug wherein said gasket is compressed.
References Cited in the le of this patent UNITED STATES PATENTS 1,133,320 Rockwood Mar. 30, 1915 1,685,059 Bailey Sept. 18, 1928 2,941,105 `Rickenbach June 14, 1960 3,029,084 Gobb Apr. l0, 1962 FOREIGN PATENTS 431,097 Great Britain July 1, 1935 761,771 Great Britain Nov. 2l, 1956 110,502 Switzerland June 1, 1925

Claims (1)

1. IN COMBINATION, A SPARK PLUG HAVING A THREADED SHANK, AND A COMPRESSIBLE ANNULAR GASKET HAVING A PRINCIPAL AXIS OF COMPRESSION; SAID GASKET INCLUDING A PLURALITY OF UNDULATING SEALING PORTIONS, AND AN INNER FLANGE HAVING AT LEAST ONE RADIALLY ARRANGED SLOT THEREIN FORMING A SEGMENTED INNER EDGE, SAID INNER FLANGE DISPOSED IN ANGULAR CONTACT RELATION WITH RESPECT TO SAID AXIS OF COMPRESSION, SO THAT OPPOSITE SIDES OF SAID INNER FLANGE ARE IN DEFORMABLE CONTACTING ENGAGEMENT WITH OPPOSED SURFACES, SAID INNER EDGE HAVING A DIAMETER WHICH IS SUBSTANTIALLY GREATER THAN THE MAJOR DIAMETER OF SAID THREADED SHANK WHEN SAID GASKET IS IN A RELATIVELY UNCOMPRESSED STATE, AND SUBSTANTIALLY LESS THAN SAID MAJOR DIAMETER WHEN IN RELATIVELY COMPRESSED STATE; WHEREBY SAID GASKET MAY BE SLIPPED UPON SAID SHANK OF SAID SPARK PLUG WITH A PURELY TRANSLATIONAL MOTION AND MAY BECOME THREADEDLY AFFIXED TO SAID SHANK UPON THE INSTALLATION AND TIGHTENING OF SAID SPARK PLUG WHEREIN SAID GASKET IS COMPRESSED.
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Cited By (21)

* Cited by examiner, † Cited by third party
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US3143355A (en) * 1961-08-15 1964-08-04 Mccord Corp Spark plug gasket
US3156477A (en) * 1963-08-19 1964-11-10 Harold P Hopp Spark plug gasket and tool therefor
US3529837A (en) * 1968-12-02 1970-09-22 Champion Spark Plug Co Gasket
US3948532A (en) * 1975-05-23 1976-04-06 Hopp Harold P Captive type sparkplug gasket
US4003120A (en) * 1975-07-08 1977-01-18 Hopp Harold P Captive type spark plug gasket and tool for installing same
US4064612A (en) * 1976-10-26 1977-12-27 Hopp Harold P Locking type gasket for spark plugs having fully threaded shanks and tool therefor
US4168839A (en) * 1977-03-18 1979-09-25 Harold P. Hopp Means and method for installing captive type spark plug gaskets
US4241491A (en) * 1979-05-04 1980-12-30 Hopp Harold P Method of installing captive type spark plug gasket with low profile locking tabs
US4528959A (en) * 1984-01-23 1985-07-16 Deere & Company Seal for an internal combustion engine
US4749321A (en) * 1987-04-24 1988-06-07 Elco Industries, Inc. Sealing fastener
US4813692A (en) * 1987-01-22 1989-03-21 Eg&G Pressure Science, Inc. Pressure balanced S-seal
US4854600A (en) * 1987-01-22 1989-08-08 Eg&G Pressure Science, Inc. Pressure balanced metallic S-seal
FR2649773A1 (en) * 1989-07-11 1991-01-18 Jaeger Captive seal
US6386593B1 (en) * 1999-10-29 2002-05-14 Automotive Fluid Systems, Inc. Dual-plane seal for fluid-tight conduit connection
US20060083600A1 (en) * 2001-09-28 2006-04-20 Yao Zhao Fastening apparatus and a special tool thereof
US20080118329A1 (en) * 2006-10-19 2008-05-22 Elringklinger Ag Combination of a screw member, a washer and a sleeve and also a method of producing such a combination
US7477006B2 (en) * 2006-10-30 2009-01-13 Ngk Spark Plug Co., Ltd. Spark plug for internal combustion engine and method of manufacturing the same
US20090169329A1 (en) * 2002-07-26 2009-07-02 Siegal David M Push-on bolt stabilizer
US8616818B2 (en) 2011-02-17 2013-12-31 Raytheon Company Gripping washer having one or more deformable gripping tabs and method for reducing foreign object debris
US8894336B1 (en) * 2013-08-01 2014-11-25 Perry McThenney Self-tapping and sealing replacement plug
US10788070B2 (en) * 2016-10-04 2020-09-29 Liberty Hardware Mfg. Corp. Quick-disconnect fastening system

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CH110502A (en) * 1924-09-03 1925-06-01 Wilde Franz Removable tripod base.
US1685059A (en) * 1926-08-25 1928-09-18 Claude B Bailey Spark-plug gasket
GB431097A (en) * 1934-07-17 1935-07-01 Charles Soukup Improvements in jointing members or washers
GB761771A (en) * 1953-08-20 1956-11-21 Walter Ziehr Improvements in or relating to nuts
US2941105A (en) * 1952-08-02 1960-06-14 Avco Mfg Corp Gasket
US3029084A (en) * 1959-04-21 1962-04-10 Mccord Corp Spark plug gasket

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US1133320A (en) * 1914-11-16 1915-03-30 George I Rockwood Packing-ring for pipe-fittings.
CH110502A (en) * 1924-09-03 1925-06-01 Wilde Franz Removable tripod base.
US1685059A (en) * 1926-08-25 1928-09-18 Claude B Bailey Spark-plug gasket
GB431097A (en) * 1934-07-17 1935-07-01 Charles Soukup Improvements in jointing members or washers
US2941105A (en) * 1952-08-02 1960-06-14 Avco Mfg Corp Gasket
GB761771A (en) * 1953-08-20 1956-11-21 Walter Ziehr Improvements in or relating to nuts
US3029084A (en) * 1959-04-21 1962-04-10 Mccord Corp Spark plug gasket

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143355A (en) * 1961-08-15 1964-08-04 Mccord Corp Spark plug gasket
US3156477A (en) * 1963-08-19 1964-11-10 Harold P Hopp Spark plug gasket and tool therefor
US3529837A (en) * 1968-12-02 1970-09-22 Champion Spark Plug Co Gasket
US3948532A (en) * 1975-05-23 1976-04-06 Hopp Harold P Captive type sparkplug gasket
US4003120A (en) * 1975-07-08 1977-01-18 Hopp Harold P Captive type spark plug gasket and tool for installing same
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