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Publication numberUS2694328 A
Publication typeGrant
Publication dateNov 16, 1954
Filing dateSep 4, 1953
Priority dateSep 4, 1953
Publication numberUS 2694328 A, US 2694328A, US-A-2694328, US2694328 A, US2694328A
InventorsLafreniere Eugene A
Original AssigneeLafreniere Eugene A
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Tool for removing studs or the like
US 2694328 A
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Description  (OCR text may contain errors)

1954 E. A. LA FRENIERE TOOL FOR REMOVING STUDS OR THE LIKE Filed Sept. 4, 1953 INVENTOR. EUGENE A. LAFRENIERE BY ffiwx 8; 101m ABENTS FQR APPL|CQNT United States Patent O TOOL FOR REMOVENG STUDSOR THE LIKE Eugene A. Lafreniere, Escondido, Calif.

Application September 4, 1953, Serial No. 378,649

Claims. (Cl. 8153) The present invention relates generally to hand tools and more particularly to a tool for removing studs, broken bolts, or the like.

The primary object of this invention is to provide a stud removing tool of unitary construction which is shaped to exert extreme clamping or gripping action on studs or broken bolts and comtemporaneously insuring against splitting or spreading the outer ends of the studs or bolts, during dislodgement thereof.

Another object of this invention is to provide a stud removing tool which is suitable for removing studs from deep sockets or cavities.

Another object of this invention is to provide a stud removing tool which may be operated by conventional wrenches or similar tools, provision being made for application of wrenches alternatively upon intermediate and terminal portions of the tool.

Another object of this invention is to provide a stud removing tool which is inexpensive and practicable to manufacture.

Finally, it is an object to provide a stud removing tool of the aforementioned character which is simple, safe and convenient to use, and which will give generally efficient and durable service.

With these and other objects definitely in view, this invention consists in the novel construction, combination and arrangement of elements and portions as will be hereinafter fully described in the specification, particularly pointed out in the claims, and illustrated in the drawing which forms a material part of this disclosure and wherein similar characters of reference indicate similar or identical elements and portions throughout the specification and throughout the views of the drawing, and in which:

Fig. 1 is a perspective view of the tool.

Fig. 2 is an end elevation view of the tool.

Fig. 3 is a longitudinal sectional view taken on the line 33 of Fig. 2.

Fig. 4 is a sectional view showing the tool engaged with a stud, the tool being shown partially in elevation for clarity.

Referring now to the drawing, the tool comprises a body member 8 with an integral screw threaded shank 10 having at one end an enlargement or integral collar 12 which is provided with a hexagonal portion 14 to fit a standard wrench. Extending upwardly from the collar 12 is a plain shank 16 having at its end a plurality of flats 18 constituting a wrench engaging member or plug 20.

The collar 12 surrounding the threaded shank 10, has a V-shaped undercut or groove 22 which extends to the periphery of the collar to provide a knife edge 24 around the lower edge thereof. This knife edge will always be generally annular but it is interrupted or serrated when greater penetration is desired.

The threaded shank 10 is slightly tapered towards its end and is provided with a plurality of flutes 26 to receive cuttings in the manner of a conventional screw threading tap. The threads 28 thereon are hardened so that the threaded shank 10 is self tapping, the threads extending upwardly into the undercut 22. Ordinarily the shank 10 has a left hand thread, although the essential feature is that the shank 10 shall have threads opposite to the threads of the stud or bolt to be removed.

The primary use of the tool is for removing broken bolts, studs or the like from cavities or sockets in mechanical structures. Various devices have heretofore been used for this purpose but they usually have re- Patented .Nov. 16, 1 9 54 .quired specialized .:tools for their successful'operation.

The present device may be actuated by a conventional The use .of'the-tool isillustrated in 'Fig. 4 in which a ;stud 30 is lodged withinithe bore 32 of a structure:34. 1111 order .toremovesthe studs30, a socket 36 is first drilled therein and the toolisziusertedtinthe;socket. 'By rotating the tool with a wrench, the threaded shank 10 is screwed into the stud and, since it has left hand threads, a right handed stud will be loosened and start to unscrew from the bore 32 when the threading torque overcomes the resistance to turning of the stud. Should the stud 30 be tightly jammed in place, the tool may be screwed into the socket 36 until the knife edge 24 cuts into the top of the stud. The inclined wall 40 of the V-shaped groove 22, behind the knife edge 24 causes the material of the stud to be forced inwardly as indicated at 38, so wedging the stud tightlv on the threaded shank 10. This combination of the knife edge 24 and bevel 40 also prevents the spreading and splitting of the stud.

Further rotation of the tool unscrews the stud from the threaded bore 32. It will be evident that the relatively small diameter of the collar 12 and the hexagonal portion 14 allows the tool to penetrate into structures as shown in Fig. 4.

The operation of this invention will be clearly comprehended from a consideration of the foregoing description of the details thereof, taken in connection with the drawing and the above recited objects. It will be obvious that all said objects are amply achieved by this invention.

Further description would appear to be unnecessary.

It is understood that minor variation from the form of the invention disclosed herein may be made without departure from the spirit and scope of this invention, and that the specification and drawing are to be considered as merely illustrative rather than limiting.

I claim:

1. A stud removing tool comprising a body member having a wrench receiving portion and a threaded shank, a collar on said body member at one end of and unitary with said shank, said collar having a generally annular, continuous knife edge on the side thereof adjacent said shank, said knife edge extending in spaced relation to and coaxially of said shank, said collar having a wall inclining from said knife edge to define the outer wall of a groove encircling said shank, whereby material at the end of a stud engaged by said knife edge is urged inwardly of said groove to prevent the stud from bindlng.

2. A stud removing tool comprising a body member having a screw threaded shank and a collar at one end of and unitary with said shank, said collar having a generally annular, continuous knife edge on the side thereof adjacent said shank and extending in spaced relation and coaxially of said shank, said collar having a wall inclining from said knife edge to define the outer wall of a groove encircling said shank, whereby material at the end of a stud engaged by said knife edge is urged inwardly of said groove to prevent the stud from binding, and wrench receiving means on said collar.

3. A stud removing tool comprising a body member having a screw threaded shank and a collar at one end of and unitary with said shank, said collar having a generally annular, continuous knife edge on the side thereof adjacent said shank and'extending in spaced relation and coaxially of said shank, said collar having a wall inclining from said knife edge to define the outer wall of a groove encircling said shank, whereby material at the end of a stud engaged by said knife edge is urged inwardly of said groove to prevent the stud from binding, and wrench receiving means on said collar, said knife edge being disposed at the periphery of said collar, said threaded shank extending into said groove.

4. A stud removing tool comprising a body member having a screw threaded shank and a collar at one end of and unitary with said shank, said collar having a generally annular, continuous knife edge on the side thereof adjacent said shank and at the periphery of said collar, wrench receiving means on said collar, said collar having an undercut groove disposed inwardly of said knife edge, said threaded shank extending into said groove, said groove beingd defined (in part by an inclinecdl wall extend References Cited in the file of this patent ing from sai knife e ge to the root 0 sai groove, sai body member including a plain shank extending from said UNITED STATES PATENTS collar on the side remote from said threaded shank, said Number Name Date plain shank having wrench receiving means at the end 5 1,548,835 French Aug. 11, 1925 thereof. 1,549,041 Berg Aug. 11, 1925 5. A tool according to claim 4 and wherein said collar 1,683,796 Pearce Sept. 11, 1928 has a diameter less than twice the diameter of the shank, 1,785,847 Valentine Dec. 23, 1930 whereby the tool is dimensioned so that it can ordinarily 2,281,164 Maling Apr. 28, 1942 be inserted beyond the collar in extraction of a deeply 10 2,622,466 Vanden Bos et a1 Dec. 23, 1952 imbedded stud With the wrench receiving means at the end of the plain shank then being used.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1548835 *Nov 27, 1923Aug 11, 1925French Elsamur SDevice for removing broken wood screws
US1549041 *Sep 17, 1924Aug 11, 1925William A YeagherStud-removing tool
US1683796 *Oct 14, 1926Sep 11, 1928David PearceBroken-tap extractor
US1785847 *Dec 31, 1928Dec 23, 1930Valentine Mary CScrew-moving means
US2281164 *Feb 19, 1941Apr 28, 1942Maling Howard SDevice for removing broken studs
US2622466 *Apr 18, 1949Dec 23, 1952Leo J RobinsonStud remover and driver
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2760393 *Dec 14, 1953Aug 28, 1956Whitehead & Kales CoBolt tensioning apparatus
US2912890 *Apr 15, 1958Nov 17, 1959Cleveland Twist Drill CoStud removers
US2915930 *Jun 12, 1958Dec 8, 1959Titan Tool CoBushing or insert driver
US2933962 *Mar 28, 1958Apr 26, 1960Logan Mfg CompanyNon-marring wrench fitting for pipes and the like
US2949800 *May 11, 1959Aug 23, 1960Robert NeuschotzTool for installing threaded elements
US3096574 *Aug 30, 1957Jul 9, 1963Superior Concrete AccessoriesCoil tie spacer cone and pulling device for the removal thereof from concrete installations
US3263533 *Aug 27, 1964Aug 2, 1966Textron Ind IncScrew extractor
US3457812 *Sep 21, 1967Jul 29, 1969Hi Shear CorpTools having teeth with cutting edges for gripping and disassembling fasteners
US3508321 *Dec 15, 1967Apr 28, 1970Aai CorpMethod for extracting broken studs
US5649791 *May 17, 1994Jul 22, 1997Connolly; MatthewApparatus and method for boring a hole in a broken bolt
US5951287 *Apr 15, 1998Sep 14, 1999Hawkinson; Roy T.Dental implant failed fastener recovery systems, devices and methods
US6761089 *Feb 19, 2003Jul 13, 2004Proqual, LlcTool for removing screws with damaged heads
US6868756 *Feb 12, 2003Mar 22, 2005Combined Products IncorporatedDevice to extract broken fasteners embedded in a workpiece
US7152509 *Feb 25, 2005Dec 26, 2006Irwin Industrial Tool CompanyFastener extractor
US7971508 *May 23, 2007Jul 5, 2011Kozak Ira MDevice to extract broken fasteners embedded in a workpiece
US20130266913 *May 23, 2013Oct 10, 2013Nobel Biocare Services AgDental implant, a dental implant kit and a method of securing a dental bridge to the jaw of a patient
WO2006078467A2 *Jan 5, 2006Jul 27, 2006Alden CorpTool for removing screws with damaged heads
Classifications
U.S. Classification81/53.2, 81/441, 29/426.5
International ClassificationB25B27/18, B25B27/14
Cooperative ClassificationB25B27/18
European ClassificationB25B27/18