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Publication numberUS2758494 A
Publication typeGrant
Publication dateAug 14, 1956
Filing dateMay 31, 1955
Priority dateMay 31, 1955
Publication numberUS 2758494 A, US 2758494A, US-A-2758494, US2758494 A, US2758494A
InventorsBilly J Jenkins
Original AssigneeBilly J Jenkins
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Extensible wrench set with magnetized heads
US 2758494 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Aug. 14,1956 5. J. JENKINS 2,758,494

EXTENSIBLE WRENCH SET WITH MAGNETIZED HEADS Filed May 31, 1955 23 22 z5 l Li /6 23 t 24 y; m


Application May 31, 1955, Serial No. 512,202

1 Claim. (Cl. 81-71) The present invention relates to wrenches, and more particularly to wrenches of the internal or Allen type provided with means to extend the length of the wrench.

The primaiy object of the invention is to provide an Allen wrench with a head for receiving the shank of the next larger wrench size.

Another object of the invention is to provide a wrench of the class described in which the head is formed with a polygonal outer surface to permit the turning of the wrench by means of other wrenches.

A further object of the invention is to provide a wrench of the class described in which magnetic means are used to maintain the wrenches in engagement with each other while in use.

Other objects and advantages will become apparent from the following specification when read in light of the attached drawings, in which:

Figure 1 is a top plan view of the invention.

Figure 2 is a side elevation of the invention, shown partly in section for purposes of clarity.

Figure 3 is a transverse cross-section taken on line 33 of Figure 2, looking in the direction of the arrows.

Figure 4 is a transverse cross-section taken on line 4-4 of Figure 2, looking in the direction of the arrows.

Figure 5 is a perspective view of one of the wrench elements.

Now referring to the drawings in detail, wherein like reference'numerals indicate like parts throughout the several figures, the reference numeral indicates, generally, an Allen wrench having a polygonal shank 11. An enlarged head 12 is formed on one end of the shank 11 and has a polygonal outer surface 13. A socket 14 having a polygonal inner surface 15 is formed in the head 12 and is adapted to fit the shank (not shown) of the next larger wrench (not shown).

A second polygonal wrench shank 16 has a head 17 positioned on one end of the shank 16 and it likewise is formed with an outer polygonal surface 18. A socket 19 is formed in the head 17 with an inner polygonal surface 20. The socket 19 is adapted to receive the shank 11 of the wrench 10.

A polygonal shank 21 is formed with a head 22 on one end thereof with the outer surface of the head 22 having a polygonal surface 23. A socket 24 extends into the head 22 and has an internal polygonal surface 25 formed therein. The socket 24 is adapted to receive the polygonal shank 16 therein.

Each of the heads 12, 17 and 22 is magnetized, so that the shanks ll, 16 and 21 will be magnetically held in the heads after they are inserted in the socket.

In the use and operation of the invention, when an Allen head screw must be turned and the screw is remote from the closest point accessible with the normal tools, the wrenches forming the portions of the kit making up applicants invention are assembled by inserting the shank 11 into the head 17 and the shank 16 into the head 22 to form an Allen wrench having a length substantially greater than normal. Obviously, the Wrenches can be extended in length as far as necessary to accomplish the desired task. The outer polygonal surfaces 13, 18 and 23 provide a means whereby end wrenches, pliers, socket wrenches or box wrenches may be used to turn the Allen wrench after it has been seated in the head of the Allen screw. It should be understood, of course, that various extensions could be made following the teachings of this invention wherein the sockets contained within the heads would be the same size as the shanks, to permit extending the wrenchs effective length without decreasing the size of the available Allen wrench end.

Having thus described a preferred embodiment of the invention, it should be understood that various modifications and structural adaptations may be resorted to without departing from the scope of the appended claim.

What is claimed is:

A wrench of the type having a plurality of diiferent size members each having a polygonal shaft and a head, and each head being integrally connected to one end of a shaft, and having a polygonal outer surface, each head being provided with a polygonal internal socket extending into said head from the side opposite its shaft, each head being magnetized to hold said wrench in engagement with a metallic body, said members being arranged in end to end relation with each shaft being receivable in the magnetized head of the next smaller member and maintained therein by the magnetic attraction of said head.

References Cited in the file of this patent UNITED STATES PATENTS 1,619,744 McCloskey Mar. l, 1927 2,457,451 Domack Dec. 28, 1948 2,632,350 Kaster Mar. 24, 1953 2,660,080 De Kam Nov. 24, 1953

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1619744 *Mar 28, 1921Mar 1, 1927Paul J MccloskeyMechanic's fishing tool
US2457451 *Jun 16, 1947Dec 28, 1948Domack Lawrence CMethod of making internal wrenching tools
US2632350 *Feb 4, 1950Mar 24, 1953Kaster Richard HLug wrench support
US2660080 *Jun 28, 1950Nov 24, 1953Kent Moore Organization IncInternal wrench with fastener retention means
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2973677 *Jul 21, 1958Mar 7, 1961Kenneth ReinerInternal wrenching tools
US3014543 *Sep 28, 1956Dec 26, 1961Chicago Pneumatic Tool CoRoof bolting drill chuck assembly
US4375224 *Jan 21, 1981Mar 1, 1983Acutherm, Inc.Air conditioning control equipment
US4399723 *Sep 25, 1980Aug 23, 1983Gilles MarleauCompact combination tool set
US4620460 *Jul 1, 1985Nov 4, 1986Gonzales Jr FrankSocket set
US4736658 *Dec 13, 1985Apr 12, 1988Jore Matthew BScrew holding and driving device
US5522288 *Dec 9, 1994Jun 4, 1996Snap-On IncorporatedReversible ratchet wrench
US5603248 *Jan 29, 1996Feb 18, 1997Snap-On Technologies, Inc.Magnetic bit holder and hand tool incorporated same
US5931065 *May 19, 1997Aug 3, 1999Jackson; Roger LeeHand tool with axially repositionable shaft
US5957014 *Jan 13, 1998Sep 28, 1999Tseng; Hung KuiTool combination having two sections
US6009779 *Mar 13, 1998Jan 4, 2000Mastroni; Douglas J.Screwdriver set and kit having variable length interchangeable screwdriver shafts and extensions
US6026717 *Jul 23, 1998Feb 22, 2000Anderson; WayneDriver tool with high energy magnetizer/demagnetizer on tool handle
US6026718 *Sep 28, 1998Feb 22, 2000Anderson; WayneHigh energy magnetizer and selective demagnetizer integral with driver tool or the like
US6032557 *Sep 1, 1998Mar 7, 2000Anderson; WayneDriver tool kit with high energy magnetizer/demagnetizer on tool handle(s)
US6038946 *May 19, 1997Mar 21, 2000Jackson; Roger LeeAxially repositionable adapter for use with a ratchet assembly
US6060801 *Sep 28, 1998May 9, 2000Anderson; WayneHigh energy magnetizer/demagnetizer for drill housing
US6330844 *Jun 30, 2000Dec 18, 2001Russell Earl WalkerUltimate nut driver
US7364487Oct 13, 2005Apr 29, 2008Cranium, Inc.Structure building toy
US7591207 *Oct 11, 2007Sep 22, 2009George Wayne BurkhardtDevice and method for remotely manipulating a magnetic object with at least a portion thereof having a substantially prismatic shape
USRE36797 *Jul 2, 1998Aug 1, 2000Snap-On Technologies, Inc.Magnetic bit holder and hand tool incorporating same
USRE38778Jul 2, 1998Aug 23, 2005Snap-On IncorporatedMagnetic bit holder and hand tool incorporating same
DE3506415A1 *Feb 23, 1985Sep 4, 1986Stellram GmbhScrewdriver
DE3506415C2 *Feb 23, 1985Feb 12, 1987Stellram Gmbh, 6056 Heusenstamm, DeTitle not available
DE4240748A1 *Dec 3, 1992Jun 9, 1994Leonhard Hans Dipl Wirtsch IngInsert for connecting and lengthening screw spanner - has round stops with magnetic face arranged either on free ends of insert or in central region and has long bore for rod
U.S. Classification81/438, 81/177.2, 7/901, 81/900, 81/125, 279/128, 403/DIG.100
International ClassificationB25B13/56, B25B23/12
Cooperative ClassificationY10S7/901, Y10S81/90, B25B23/12, B25B13/56, Y10S403/01
European ClassificationB25B23/12, B25B13/56