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Publication numberUS2684094 A
Publication typeGrant
Publication dateJul 20, 1954
Filing dateJun 21, 1951
Priority dateJun 21, 1951
Publication numberUS 2684094 A, US 2684094A, US-A-2684094, US2684094 A, US2684094A
InventorsLissy John
Original AssigneeLissy John
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Nonslip screw driver and screwhead
US 2684094 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

J y 1954 J. LISSY NONSLIP SCREW DRIVER AND SCREWHEAD Filed June 21, 1951 Patented July 2@, 1%54 ,d i tfi 1 Claim.

This invention relates to a non-slip screw driver and screw head.

It is an object of the present invention to provide a screw having a slot chute in such a manher that upon receiving a specially formed screw driver and turning the screw driver slightly, there is no chance for the screw driver to slip from the screw head and it is locked upon the screw head.

Other objects of the invention are to provide a non-slip screw driver and screw head combination which is of simple construction, inexpensive to manufacture, permits easy insertion of the screw driver into the slot within the head, makes possible the use of a standard. screw driver within the head if the special screw driver is not available at the time, durable and efficient in use.

For other ohiects and for a better understandof the invention, reference may be had to the following detailed description taken in connection with the accompanying drawing, in which:

Fig. 1 is collective and perspective View showing the end of the screw driver and of a screw bolt having a head specially formed to receive the special screw driver.

Fig. 2 is transverse sectional view of the screw driver taken on line 22 of Fig. 1.

Fig. 3 is a top plan view of the screw head and looking into the slot thereof.

Fig. 4 is a vertical elevational View of the screw driver fitted into a screw head.

Fig. 5 is a top plan view of a screw head and of the screw driver turned thereinto for grinning action, the view being taken on line 5ii of Fig. 4.

Fig. 6 is a transverse se ti nal view taken on the same line as the view of 5 is taken. but with the screw driver twisted out of engagement with the sides of the slot and the undercut areas thereof.

7 shows a screw driver supporting a screw and held in a position to apply the screw to an under surface.

Referrin now to the figures. iii re resents the screw bolt havin a screw M with a special slot is cut according to the present invention. This slot iii has the sides thereof beveled away from the center. indicated at is and M, undercut from the center at opposite locations. as indie. d at E5 and it.

A screw driver end it is provided on the opposite sides thereof pectively with downwardly and outwardly flared projections I! and i8 adapted to fill respectively the undercut spaces i5 and iii of the walls 13 and M of the slot is in the head H.

As the screw driver is turned after being put in the slot in the manner illustrated in Fig. 5, this action is effected. It will be seen that it is impossible for the screw driver end to be removed from the slot in the screw from any direction long as it is turned to the position shown in Fig. 5. It cannot slide either to the right or left through the slot nor can it be pulled axially without first being rotated or returned to the position shown in Fig. 6.

While the invention is shown applied to a machine screw in Fig. 1, it will he understood that it can be equally applied to a wood screw, as indicated at IS in Figs. to 7. The same type of slot as defined above is provided in this wood screw.

As shown in Fig. '7, the screw driver 1! supports and retains a screw on its upper end with the screw driver being held in an inverted position and in order that the screw It can be forced into the under surface of a structure indicated at 2 1.

When the non-slip screw driver is inserted into the non-slip screw head and when a slight turn is made to the right with the screw driver, the screw driver tends to wedge itself into the undercut portions of the screw head. This interlocking action of the screw driver with the screw head keeps the screw driver from slipping to the right or to the left of the slot.

While various changes may be made in the detail construction. it shall be understood that such. changes shall be within the spirit and scope of the present invention as defined by the appended claim.

Having thus set forth and disclosed the nature of my invention, what is claimed is:

In combination, a screw head havin a transverse ton slot defin ng opposed side wall therein, said s ot be n widened. from. its center toward both ends the top face of the screw head. two diagonally opposite per one of the side walls of the slot being disposed. in planes extending parto the of the screw the other two diagonally opposite portions of side walls of the slot being undercut from the top face of the screw head to the bottom of the slot, a screw driver of substantially rectangular crosssection and having its faces tapered towards the end of the screw driver, two diagonally opposed portions of the faces at the end portion of the driver having outwardly inclined projections at an angle complementary to that of the undercut portions of the side walls of the slot in the screw head, so that the two diagonally oppositely disposed projections engage the undercut walls of the screw head in operative position.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 132,946 Armstrong Nov. 12, 1872 685,197 Barnes Oct. 22, 1901 1,656,095 Groos Mar. 18, 1913 1,411,242 Faust Mar. 23, 1922 FOREIGN PATENTS lluinher Country Date 10,612 Germany Jan. 31, 1880

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US132946 *Nov 12, 1872 John s
US685197 *Apr 10, 1900Oct 22, 1901Oscar ReuterScrew-driver.
US1056095 *Feb 3, 1913Mar 18, 1913Charles GroosScrew-driver.
US1411242 *Dec 11, 1920Mar 28, 1922Faust Guy WScrew driver
*DE10612C Title not available
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2800936 *Sep 15, 1955Jul 30, 1957Wesloc Screw IncCruciform screw driver
US2820972 *May 24, 1954Jan 28, 1958Wilbur F PtakMethod of stamping screw threaded fasteners from flat bar stock
US2954719 *Oct 24, 1957Oct 4, 1960Rudolph M VaughnAsymmetrical screw head slots
US4026338 *Apr 26, 1976May 31, 1977Goebel Ronald GRetractor for one-way screw
US4339971 *Jan 28, 1980Jul 20, 1982Zatorre Alfredo EFastener and driving tool
US4538486 *Nov 21, 1983Sep 3, 1985Jacques LutratNon-slip screw
US4625598 *May 10, 1985Dec 2, 1986Frank WolframPositive engagement screw driver tool
US4977800 *Mar 21, 1990Dec 18, 1990Colvin David SScrewdriver blade construction
US5353667 *Apr 23, 1993Oct 11, 1994Wilner David WCombination tool and fastener
US5438895 *Apr 29, 1994Aug 8, 1995Bassell; MarvinFastener and driving tool
US5461944 *Jun 17, 1994Oct 31, 1995Ciumaga; MassimoMethod of making a screwdriver
US5582548 *Jul 22, 1991Dec 10, 1996Czegledi; ImreMethod of manufacture of anti-slip fastener
US5722838 *Feb 14, 1994Mar 3, 1998Czegledi; ImreFastener system and method of manufacture thereof
US7494311 *Apr 19, 2003Feb 24, 2009Fuerle Richard DUndercut screw and matching bit
US8881625Dec 5, 2011Nov 11, 2014Robert JenkinsHigh speed, high torque screw fasteners and drive systems
US20100003634 *Apr 5, 2007Jan 7, 2010D B Orthodontics LtdOrthodontic implant device
US20120090435 *Nov 19, 2010Apr 19, 2012Nurlan DauletbayevScrew and screwdriver for screwing and unscrewing the screw
DE1156718B *May 9, 1957Oct 31, 1963Hans PribitzerSchraubenzieher fuer Schlitzschrauben, deren Schlitz einen schwalbenschwanzfoermigen Querschnitt hat
WO2009142469A1 *Mar 4, 2009Nov 26, 2009Nurlan DauletbayevWood screw and a screw drive for screwing in and off said wood screw
WO2014146187A1 *Oct 18, 2013Sep 25, 2014Guido StahlFastener head and complementary driver
Classifications
U.S. Classification81/436, 411/407, D08/387, 411/406, 411/919
International ClassificationF16B23/00, B25B15/00
Cooperative ClassificationB25B15/007, Y10S411/919, F16B23/0015
European ClassificationF16B23/00B2, B25B15/00B2C