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Publication numberUS1458076 A
Publication typeGrant
Publication dateJun 5, 1923
Filing dateJun 3, 1922
Priority dateJun 3, 1922
Publication numberUS 1458076 A, US 1458076A, US-A-1458076, US1458076 A, US1458076A
InventorsPotts Clifton W
Original AssigneePotts Clifton W
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Extracting device
US 1458076 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

C. W. POTTS June 5, 1923.

EXTRACTING DEVI CE Filed June 5, 1922 GW. Pouq R w T Qm mm Patented June 5, 1923.. p it unman crates CLIFTON W. POTTS, OF PLANO, TEXAS.


Application filed June a, 1922. Serial No. 565,529.

To all wlwm it may concern Be it known that I, CLIFTON W. Form, a citizen of the United States, residing at Plano, in the county of Collin and State of Texas, have invented new and useful Improvements in Extracting Devices, of which the following is a specification.

This invention relates to tools and has'for its object the provision of a novel device for extracting broken off bolts, studs and the like from the holes into which they are screwed,

the device being particularly designed for use in connection with the engines of automobiles for removing broken off cylinder head bolts.

An important object is the provision of an extractor of this character which will be of unusual advantage in obviating danger of spreading the stud or bolt and hindering its extraction. It is well known that the ordinary devices for this purpose frequently dig too deeply into the broken off element and cause such expansion that extraction is hindered if not entirely defeated. It is with this defect in view that I have designed the present device which includes a jam nut engaging the top of the casting for preventing too great penetration of the rotary .element. 1

An additional object is the provision of a device of this character which will be simple and inexpensive in manufacture, positive in action, efiicient and durable in service and a general improvement in the art.

With the above and other objects and advantages in view the invention consists in the details of construction to be hereinafter more fully described and claimed and illus trated in the accompanying drawings, in which:

Figure 1 is a side elevation of the device, Figure 2 is an end view, Figure 3 is alongitudinal section showing it in the act of extracting a broken off bolt, and

Figure 4 is an end view of the bit. Referring more particularly to the drawings the letter A designates a casting having a hole B within which is a broken oif bolt A or stud C to be removed.

turning movement and which is provided with a threadedbore 12 having a right hand thread. Associated with this nut member is a, shank 13 terminating at one end with a squared portion 14 engageable by a wrench and having its intermediate portion 15 threaded with a right hand thread and screwed into the nut member. The other end of this shank terminates in a left hand cork screw like reamer 16 designed as shown.

In the use of the device the broken off bolt or stud C is drilled by ordinary means to quite some depth and my device is then applied to this hole, the shank being rotated to the left by a suitable wrench to cause the reamer element 16 to enter the hole and jam firmly therein. The nut member 10 is then turned down by a suitable wrench until it engages the face of the casing A. The operator then rotates the shank 13 in a left hand direction, whereupon the rotary movement of the reamer element will naturally result in unscrewing the bolt or stud forefiecting its removal from the hole in the casting. To use the tool with the greatest ease and efficiency the pitch of the threads on the screw 15 and stud C should be the same. Otherwise, if the pitch of the threads is different it .is required thatthe nut 10 be continually operated throughout the operation of the screw 13 to insure proper seat-ing engagement of the nut upon the casting. Such an operation will prevent'the withdrawal from or further penetration of the reamer in the stud which would otherwise take place due to the difi'erent rates of travel between the stud C and screw 13.

From the foregoing description and a study of the drawings it will be apparent tically no skill and remarkably little labor.

in its operation.

While I have shown and described the preferred embodiment of the invention it is of course to be understood that I reserve the right to make such changes in the form, construction and arrangement of parts as will not depart from the spirit of-the invention or the scope of the subj oined claims.

Having thus described my invention I claim:

1. A tool of the character described comprising a nut member havin an angular portion engageable by a turning tool, said nut member having a right hand threaded bore, a right hand threaded shank-screwed through said bore and'form'ed with an angu lar portion engageable by a turning tool, and

5 a left hand cork screw like reamer at the free end of said shank member.

2. A tool of the character described comprising a nut member havin anangular portion engageable by a turning tool, said 10 not member having a right hand threaded bore, a threaded shank screwed through said bore and formed with an angularportion engag'ea'ble by a turning 'tool, and a cork screw like reamer at the free end of said shank member said reamer tapering and having left hand spiral flutes.

In testimony whereof I affix my signature.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2434660 *Mar 21, 1946Jan 20, 1948Knight Frank ETool for rotating threaded articles
US2466845 *Jul 17, 1945Apr 12, 1949Catherine ThomasPacking removing tool
US2547986 *Nov 27, 1946Apr 10, 1951Henry Leland Van DermarkMethod for removal of broken spark plugs
US2684526 *Jul 6, 1951Jul 27, 1954Dean Hoover JohnMethod for backing off broken studs
US2684606 *Mar 17, 1952Jul 27, 1954Eugene A LafreniereCombination self-threading easy out and lock nut
US2752671 *Jan 19, 1953Jul 3, 1956Louis AlyeaMethod of removing threaded shafts
US2851768 *Dec 21, 1953Sep 16, 1958Ellis James AllenThreaded insert removing and applying tool
US3096574 *Aug 30, 1957Jul 9, 1963Superior Concrete AccessoriesCoil tie spacer cone and pulling device for the removal thereof from concrete installations
US3120700 *Jan 24, 1961Feb 11, 1964United States Steel CorpTube puller
US3161090 *Oct 17, 1962Dec 15, 1964Mclellan Silas BStud engaging wrench having a fluted gripping surface
US3997960 *Feb 19, 1976Dec 21, 1976Kenyon David LAutomobile lock removal tool
US4330917 *Mar 20, 1980May 25, 1982Damon DzurkovichSeal extracting tool
US4944081 *Jun 15, 1989Jul 31, 1990Mobil Oil CorporationPacking removal tool
US5068954 *Sep 12, 1990Dec 3, 1991Houska Robert LDart shaft extraction tool
US5075948 *Aug 8, 1990Dec 31, 1991Maier Danny LMinimum clearance dowel pin extraction tool
US5123812 *Sep 12, 1990Jun 23, 1992Westinghouse Electric Corp.Apparatus for aligning a blade ring in a steam turbine
US5127145 *May 29, 1990Jul 7, 1992Mobil Oil CorporationProcess for removing packing
US5299347 *Mar 1, 1993Apr 5, 1994Joseph DeckerTool for removing and inserting a plumbing fixture seal structure
US5388933 *Mar 21, 1994Feb 14, 1995Dunbar; DavidTool for centering a punch or drill on a stud's broken face
US5649791 *May 17, 1994Jul 22, 1997Connolly; MatthewApparatus and method for boring a hole in a broken bolt
US5820314 *Jul 3, 1996Oct 13, 1998Dunbar; David A.Tool for centering a punch or drill on a stud's broken face
US6643904Jun 17, 2002Nov 11, 2003James D. HedspethShank removal tool for a carburetor
US7152509Feb 25, 2005Dec 26, 2006Irwin Industrial Tool CompanyFastener extractor
US7971508 *May 23, 2007Jul 5, 2011Kozak Ira MDevice to extract broken fasteners embedded in a workpiece
US8579180Sep 20, 2012Nov 12, 2013Dwight A. BurfordMandrel tool probe for friction stir welding having physically-separate spiraled surfaces
US20050178245 *Mar 21, 2005Aug 18, 2005Kozak Ira M.Device to extract broken fasteners embedded in a workpiece
US20050216027 *Mar 24, 2004Sep 29, 2005Suh Sean SExtraction screwdriver
US20060191379 *Feb 25, 2005Aug 31, 2006Irwin Industrial Tool CompanyFastener extractor
US20090100973 *May 23, 2007Apr 23, 2009Kozak Ira MDevice to extract broken fasteners embedded in a workpiece
US20150020357 *Sep 24, 2013Jan 22, 2015Wistron CorporationTool set and disassembling tool thereof
WO2002090936A1 *May 8, 2002Nov 14, 2002Anglia Polytechnic UniversityExtractor device for extracting an increment borer
U.S. Classification81/441, 29/263, 29/281, 29/700, 29/264, 81/53.2
International ClassificationB25B27/18, B25B27/14
Cooperative ClassificationB25B27/18
European ClassificationB25B27/18