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Publication numberUS1797390 A
Publication typeGrant
Publication dateMar 24, 1931
Filing dateFeb 4, 1929
Priority dateFeb 4, 1929
Publication numberUS 1797390 A, US 1797390A, US-A-1797390, US1797390 A, US1797390A
InventorsFrederick H Wood
Original AssigneeFrederick H Wood
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Screw driver designed to be keyed on a screw
US 1797390 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

March 24, 1931. H D

SCREW DRIVER DESIGNED TO BE KEYED ON A SCREW Filed Feb 4, 1929 fwd k Wm.

I INVENTOR PATENT OFFICE FREDERICK WOOD, OI CHICAGO, ILLINOIS SCREW DRIVER DESIGNED 1'0 33 ON A 8m Application filed February 4 1m. Serial menses.

This invention relates to a screw driver designed to be keyed on a screw, which enables instant and permanent contact between i the driver and the screw'without binding and 6 throughout the drive, and holds the screw in alignment with the driver. Because of these features it is peculiarly adaptable for factory work in driving screws by power. The difiiculties heretofore encountered 10 with keyed on screw drivers were, that of inserting the key in the reciprocal-key hole of the screw head, nearly as diflicult to accomplish as centering the ordinarybit in the cross slot of a screw, a tapered key which would bind in the key hole, the expensive special screw, and a short bearing of the key and key hole, functioning merely as a key or requiring a. deep'erbore in the screw than was practical. In order that the blade of thescrew driver may have suflicient stren th to revent bending, buckling or breaklng undgr strain in driving the screw, it should have suflicient thickness of metal immediately above the working edge of the driver blade. To accomplish this requirement the blade of my design is tapered downward toward that portion of the blade entering the kerf of the screw.

The keyed-on screw driver of my device is desi ned to obviate these difiiculties.

aving described the purpose of my 1nvention, the nature of which will be fully understood from its description I give below when considered in connection with the drawing in which similar parts are designated by the same letter in the various figures.

Figure 1 is a side view of the blade of the screw driver. Figure 2 is a front view of the same driver. Figure 3 is a. top view of the reciprocal screw. Figure 4 shows the manner in which the driver occupies the cross slot and key hole of a screw. Figure 5 shows a cross section of the head of a screw exposing the form and depth of the key hole. Figures 6, 7 and 8 are intended to show the operation of the screw driver in relation to its various features, in'contact with the reciprocal screw. Figure 6, the insertion of the tapered point of the key. Figure 7, centered on the screw by means of the key before the signed to taper laterally from the key to the bit has entered the cross slot, and Figure 8 showing the completecontact.

In Figures 1 and 2 A is the blade of the screw driver, B is the bit, 0 is the key, and D is the tapered extremity of the key. Figure 1 also indicates that the blade of the driver is tapered longitudinally to its working edge or that portion which enters the.kerf of the screw, to add strength to the blade and to enable its working ed e to bevisible. In Figures 3 and 5% is the top surface of is; scliewi head, F the cross slot, G the reciprocal e o e.

11 Figure .4 B is the bit of the driver, de-

outer edge of the blade and bit, at least on the sides opposite the bearing sides of the bit. This eature enables easy access of the bit in the cross slot while the tool is revolved.

It will be observed that the tapered point of the key enables it to find and be easily inserted in the key hole of the screw head. The taper does not extend to the bit because the cylindrical shape of the key extending below the bit centers the bit and as the driver turns, the bit slips automatically into the cross slot of the screw. 'The cylindrical key centered on the bit and extending longitudinally above and below the extremity of the bit, and, fitting snugly into the key hole of the screw afiords along bearing which holds the screw in alignment with the driver. This cylindrical form ofthe key and the short taper at its extremity enables a straight bore in the screw head which can be formed with an ordinary straight drill at slight additional expense. The straight hole is preferable in preventing the key binding in. the key hole.

The cyhndrical key extending both above and below the extremity of the bit gives it a greater length of hearing which otherwise could only be obtained by an undesirable depth of bore in'the screw head.

I claim i 1. A screw driver, the broad sides of its blade tapered longitudinally downward to ward its working edge, comprising in combination a cylindrical key centered on the workin edge of said blade and extending m0 longitu ally with the blade above and below the said working edge,

the blade fittin into the ke of a screw being slightly tapere laterally rom its center to its lateral edges.

2. A screw driver, the broad sides of its blade tapered longitudinally downward to-' ward its workin edge, comprising in combination a cylindrical key centered on the working edge of said blade and extending longitudinally with the blade above and below the said working edge, the key being tapered toward its extremity from a point Well below the said working edge, and the portion of the blade fitting into the ke of a screw being sllghtly tapered laterally rom its center to its lateral edges.

FREDERICK H. WOOD.

the portion of x

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2431628 *Jul 27, 1942Nov 25, 1947Pheoll Mfg CompanyPilot slot screw and driving tool
US2438744 *Feb 12, 1944Mar 30, 1948Crompton & Knowles Loom WorksTool for setting bushings or inserts
US2522164 *Nov 29, 1945Sep 12, 1950Clough Paul DNonslip screw driver
US2604912 *Feb 4, 1949Jul 29, 1952Western Electric CoScrew driver
US2705030 *Jun 7, 1952Mar 29, 1955Santoro Herbert JosephPower operated screwdriver
US2800829 *Aug 30, 1954Jul 30, 1957Wesloc Screw IncCruciform recessed screw
US2847894 *Mar 16, 1955Aug 19, 1958American Screw CoSocketed screw head with uniformly offset grooves
US3062468 *Dec 30, 1960Nov 6, 1962Braun PaulTape threading device
US3175593 *Mar 27, 1962Mar 30, 1965Launay PierreScrewdriver blade
US3695321 *Jun 30, 1970Oct 3, 1972Jacob W Garehime JrCavity head screw and driving tool therefor
US3753454 *Jul 9, 1971Aug 21, 1973Totsu KScrew driver bit with double blades
US3891017 *Feb 22, 1974Jun 24, 1975Iskra MarianCombination screw and screwdriver with axial guide spigot
US4109691 *Dec 21, 1977Aug 29, 1978Wilson Floyd LeroyCombination torque release screw and screw driver
US4325153 *Oct 22, 1979Apr 20, 1982Charles FinneganCombined screwdriver and boring apparatus
US4339971 *Jan 28, 1980Jul 20, 1982Zatorre Alfredo EFastener and driving tool
US4528874 *Jan 17, 1983Jul 16, 1985Dunn J MalcolmScrew fasteners and drivers
US4572039 *May 30, 1984Feb 25, 1986Warren DesjardinsInterlocking lock screw with screw driver
US4589154 *Oct 17, 1984May 20, 1986John VaughnMethod and apparatus for forming the head of a high torque fastener
US4590825 *Oct 11, 1984May 27, 1986John VaughnHigh torque fastener and driving tool
US4625598 *May 10, 1985Dec 2, 1986Frank WolframPositive engagement screw driver tool
US5438895 *Apr 29, 1994Aug 8, 1995Bassell; MarvinFastener and driving tool
US6886431Sep 16, 2002May 3, 2005Anthony PetrsorichCombination screw driver blade tip and cooperating interlocking screw slot
US6973860Oct 30, 2003Dec 13, 2005J&M Innovative Products, LlcSplit-tip screwdriver with protective sleeve
US7028592 *Jun 28, 2004Apr 18, 2006Hills Jeffrey MTool element and screw for mating engagement therewith
US7730812Nov 7, 2007Jun 8, 2010Jone EdlandScrew head and tool for use therewith
US8544370 *Jan 14, 2011Oct 1, 2013John Watley LamarHandle-operated tool with a multi-function tool tip employable for one or more purposes on different irrigation-related products
US8739660Apr 19, 2010Jun 3, 2014Ttapdrive AsScrew head and tool for use therewith
US8881625Dec 5, 2011Nov 11, 2014Robert JenkinsHigh speed, high torque screw fasteners and drive systems
US20110173760 *Jan 14, 2011Jul 21, 2011John Watley LamarHandle-operated tool with a multi-function tool tip employable for one more purposes on different irrigation-related products
DE3601715A1 *Jan 22, 1986Jul 23, 1987Heinl ThomasChirurgisches instrumentenset zum verbinden von knochenfragmenten
WO1984004481A1 *Apr 30, 1984Nov 22, 1984Vaughn JohnImproved high torque fastener and driving tool
Classifications
U.S. Classification81/436, 411/403, 411/919
International ClassificationB25B15/00
Cooperative ClassificationY10S411/919, B25B15/007
European ClassificationB25B15/00B2C