Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Threaded fastener locked to a discreet structure – Member preassembled with substructure at through-passage or...
Reexamination Certificate
2001-03-19
2002-08-27
Wilson, Neill (Department: 3679)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Threaded fastener locked to a discreet structure
Member preassembled with substructure at through-passage or...
C411S178000, C411S321000, C411S948000
Reexamination Certificate
active
06439817
ABSTRACT:
FIELD OF THE INVENTION
The following invention relates to generally to thread repairs in machinery, particularly cast metal machines. More specifically, the instant invention is directed to a thread repair sleeve having a substantially cylindrical shape and interior and exterior threads used to replace damaged threads in a casting. The focal point is prevention of removal of the insert once installed.
BACKGROUND OF THE INVENTION
Conventional repair techniques for stripped threads includes retapping the thread. While this type of repair is effective in some situations, grossly damaged threads are usually replaced with new threads defining a larger diameter bore. This, of course, necessitates the utilization of a larger fastener within the newly threaded bore which is undesirable particularly when the element to be inserted within the threaded bore is standardized, such as a spark plug.
The following prior art reflects the state of the art of which applicant is aware and is included herewith to discharge applicant's acknowledged duty to disclose relevant prior art. It is stipulated, however, that none of these references teach singly nor render obvious when considered in any conceivable combination the nexus of the instant invention as disclosed in greater detail hereinafter and as particularly claimed.
INVENTOR
PATENT NO
ISSUE DATE
Foster
83,371
October 27, 1868
Harvey
154,864
September 8, 1874
Harvey
250,728
December 13, 1881
Patten
310,462
January 6, 1885
Ball
568,277
September 22, 1896
Farr
638,326
December 5, 1899
Riggs
678,814
JuIy 16, 1901
Smith
899,916
September 29, 1908
Wells
1,345,425
July 6, 1929
Anderson, Jr., et al.
1,408,793
March 7, 1922
Brubaker, Jr.
1,434,870
November 7, 1922
Bayer
1,539,628
May 26, 1925
Hanson
1,543,007
June 23, 1925
Bergstrom
1,963,542
June 19, 1934
Harmen
2,011,484
August 13, 1935
Hays
2,121,692
June 21, 1938
Kirby
2,291,162
July 28, 1942
Poeton
2,300,310
October 27, 1942
Michaels
2,361,701
October 31, 1944
Murphy
2,506,233
May 2, 1950
Javor
2,649,650
August 25, 1953
Diperstein
2,951,506
September 6, 1960
Diperstein
2,998,645
September 5, 1961
Forsythe
3,066,400
December 4, 1962
Matthews
3,117,486
January 14, 1964
Waltermire
3,295,580
January 3, 1967
Dalke, et al.
3,660,233
May 2, 1972
Holmes
4,074,950
February 21, 1978
Reppert
4,165,904
August 28, 1979
Grenell
4,271,554
June 9, 1981
Burke
4,295,765
October 20, 1981
Diperstein
4,599,781
July 15, 1986
Reed
4,662,806
May 5, 1987
Lee, et al.
4,810,149
March 7, 1989
Casazza
4,824,279
April 25, 1989
Reed
4,845,828
July 11, 1989
Giannuzzi
4,892,429
January 9, 1990
Choe
5,033,919
July 23, 1991
Reed
5,379,505
January 10, 1995
Reed
5,499,892
March 19, 1996
FOREIGN PRIOR ART
Arenz
350,141
June, 1931
unknown
456,481
December, 1950
Metalock
154,074
November, 1953
Betpob
492,389
January 22, 1976
Makchmob
975,270
November 23, 1982
OTHER PRIOR ART (Including Author, Title, Date, Pertinent Pages, Etc.) Time-Sert® and Big-Sert® advertisement, Screw Thread Inserts, 1999, entire advertisement.
Keen-Serts® advertisement, Solid Inserts, 1996, entire advertisement.
Heli-Coil advertisement, Screw Thread Inserts, 1998, entire advertisement.
SUMMARY OF THE INVENTION
The instant invention resolves the problems noted hereinabove and others by the provision of an insert which threads into new threads formed within the bore that is being repaired. The insert is a substantially cylindrical construct having an exterior thread which meshes with the newly threaded bore of the casting and an interior bore having threads complemental to the dimension of the preexisting fastener previously residing within the old bore. In this way, the same sized fastener or spark plug that was installed originally within the metal casting can be used after the repair. Besides fasteners and spark plugs, the insert also finds utility, inter alia, for repairing hydraulic fitting threads, pipe threads and as a blind hole insert.
Moreover, the instant invention addresses and resolves any problems associated with an attempt to subsequently remove the fastener or spark plug after the repair. In some situations, typically harsh operating environments involving corrosion or galvanic attraction between the various components of a system, the mating area between the threads of the fastener or spark plug can become seized to the insert. When this occurs, an attempt to remove the fastener or spark plug can sometimes cause rotation of the insert in conjunction with the fastener or spark plug, thwarting removal of the fastener or the spark plug alone. The probability of this occurring according to the present invention is substantially nil. The solution preferably includes the utilization of both specially formed threads and a shoulder on the insert which is adapted to provide a cylindrical bore strategically located to vertically align with the meshing exterior threads of the insert and the threads formed in the bore of the material being worked on. A top surface of the insert's shoulder includes a cylindrical bore. After the insert has been placed within the material to be repaired, a hole may be drilled extending the cylindrical bore into the juncture of the exterior threads of the insert and the threads of the bore in the material. Finally, a cylindrical pin is driven into the cylindrical bore through the shoulder and into the drilled area of the exterior threads of the insert and the threads of the bore of the material so that the insert will no longer readily move with respect to the material because the flight of the threads of the insert on an exterior surface thereof will be opposed by the placement of the cylindrical pin and its retention by the threads of the bore of the material.
Where the insert already includes a vertical channel defining a thread gap aligned with the cylindrical bore of the insert's shoulder, the drilling step is not mandatory. In this case, driving the cylindrical pin will actually improve insert retention because the threads in the bore contacted by the pin distort and therefore enhance retention of the insert in the bore.
OBJECTS OF THE INVENTION
Accordingly, a primary object of the present invention is to provide a threaded insert which resists removal once installed in a repair.
A further object of the present invention is to provide an insert which is not necessarily used in a repair, but instead provides a material of a different characteristic than the surrounding material within which it is threaded which resists dislodgment once installed. For example, the instant invention can be a relatively hard steel threaded into a relatively soft material such as aluminum to provide superior gripping and a more beneficial characteristic with the fastener or spark plug located within the interior threads of the insert.
A further object of the present invention is to provide a device as characterized above which is easy to install, difficult to remove and durable in construction.
A further object of the present invention is to provide a device as characterized above which is economical to manufacture and provides an economical solution to repairing objects which heretofore had to be discharged as unrepairable.
A further object of the present invention is to provide a device as characterized above which allows a fastener or spark plug of original dimension to be reinstalled in a bore after repair.
A further object of the present invention is to provide a device as characterized above which can be used with other fittings, such as hydraulic or pipe fittings and in blind bores.
A further object of the present invention is to provide a method for repairing or fabricating a receiving area for fasteners or spark plugs which includes the steps of providing a thread within a bore to receive. the insert, installing the insert into the threaded, bore, fixing the insert into the bore to preclude further rotation, and installing a fastener or spark plug in the bore.
Viewed from a first vantage point, it is an, object of the present invention to provide an insert, comprising, in combination: a sleeve, an exterior thread f
Kreten Bernhard
Wilson Neill
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