US3175593A - Screwdriver blade - Google Patents

Screwdriver blade Download PDF

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Publication number
US3175593A
US3175593A US182790A US18279062A US3175593A US 3175593 A US3175593 A US 3175593A US 182790 A US182790 A US 182790A US 18279062 A US18279062 A US 18279062A US 3175593 A US3175593 A US 3175593A
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US
United States
Prior art keywords
blade
slot
screwdriver
conical
hole
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US182790A
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English (en)
Inventor
Launay Pierre
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Individual
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Individual
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Publication date
Application filed by Individual filed Critical Individual
Priority to US413836A priority Critical patent/US3273442A/en
Application granted granted Critical
Publication of US3175593A publication Critical patent/US3175593A/en
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Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/44—Making machine elements bolts, studs, or the like
    • B21K1/46—Making machine elements bolts, studs, or the like with heads
    • B21K1/463—Making machine elements bolts, studs, or the like with heads with recessed heads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING OR HOLDING
    • B25B15/00—Screwdrivers
    • B25B15/001—Screwdrivers characterised by material or shape of the tool bit
    • B25B15/004—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section
    • B25B15/007—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with blade of flat or substantially flat cross-section
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
    • F16B23/00—Specially shaped nuts or heads of bolts or screws for rotations by a tool
    • F16B23/0007—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool
    • F16B23/0015—Specially shaped nuts or heads of bolts or screws for rotations by a tool characterised by the shape of the recess or the protrusion engaging the tool substantially rectangular, e.g. one-slot head
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S411/00—Expanded, threaded, driven, headed, tool-deformed, or locked-threaded fastener
    • Y10S411/919—Screw having driving contacts

Definitions

  • a characteristic feature of the invention resides in providing the head of the screw with a slot of substantially diamond-shaped cross section, with the side walls of this slot flaring outwardly at a small angle, the bottom of said slot being flat with the exception of its central part, where it is provided with a conical guiding axial hole the apex angle of which is at least approximately equal to said small angle, such a slot forming a female part adapted to cooperate with a male part consisting of a screwdriver blade of substantially diamond-shaped cross section and tapering at said small angle toward its end, said blade end being provided in its central part with a frusto-conical axial projection adapted to fit in said conical hole of the slot.
  • Such an arrangement makes it possible, on the one hand, to facilitate the formation of a slot in the screw head by stamping by means of a punch of the same shape as the above mentioned screwdriver and, on the other hand, to facilitate the holding of the screw by the end of the screwdriver, as will be hereinafter explained.
  • FIG. 1 is a sectional view on the line I-I of FIG. 3;
  • FIG. 2 is a sectional view on the line II-II of FIG. 3;
  • FIG. 3 is a plan view of the same screw
  • FIG. 4 is a side View of a blank to be used for making a punch for obtaining, by stamping, the slot in the screw head;
  • FIG. 5 is an end view of the blank of FIG. 4;
  • FIG. 6 is a side view of the punch obtained from the blank of FIGS. 4 and 5;
  • FIG. 7 is an end view, corresponding to FIG. 5, showing the forming of the punch
  • FIG. 8 shows, on an enlarged scale, the punch of FIG. 7;
  • FIG. 9 is a view similar to FIG. 8 but relating to a modification
  • FIG. 10 is a perspective view cording to this invention.
  • FIGS. 11 to 13 inclusive show, in three diiferent positions, the engagement of the screwdriver into the slot of a screw according to this invention.
  • the screw of FIGS. 1 to 3 comprises a shank 1 and a head 2 provided with a slot 3.
  • This slot has, in plan view and also in horizontal cross section, a diamond shape outline, preferably of a length smaller than the diameter of the screw head, as shown.
  • This slot has outwardly flaring side walls, with a small angle of inclination.
  • the bottom of slot 3 is flat, with the exception of its central part, which is provided with a blind hole 4, this hole being of conical shape, with an apex angle preferably equal to the above mentioned small angle of inclination of the side walls of the diamond-shaped slot, the diameter of this hole 4 being such that it is substantially inscribed in the diamond-shaped bottom of the slot.
  • the first advantage of this arrangement is that it permits of easily obtaining the slot by stamping by means of a punch of corresponding shape.
  • the flaring disposition of the walls of the slot facilitates stamping and the of a screwdriver ac- 3,175,593 Patented Mar. 30, 1965 "ice diamond shape ensures a great resistance of the punch and also a better distribution of the metal in the screw head during stamping.
  • this stamping is advantageously performed on a screw blank the head of which has in plan view a slightly oval shape, the punch being disposed with the major axis of its diamondshaped section in coincidence with the major axis of the oval.
  • the distribution of the metal after stamping will be such as to transform the oval into a circle.
  • this arrangement in combination with the use of a screwdriver of a shape corresponding to that of the slot, will permit, when it is desired to put a screw into a desired place, of wedging the end of the screwdriver blade into the slot, thus ensuring a temporary holding of the screw by the screwdriver.
  • the screwdriver is provided with a conical projection adapted to fit into the central hole of the screw facilitates the positioning of the screwdriver with respect to the screw as it will be hereinafter explained with reference to FIGS. 11 to 13.
  • Slot 3 is of a length smaller than the diameter of the screw head. Its opposed side walls 14 and end walls 15 are slightly inclined with respect to each other at an angle 2A (FIGS. 1 and 2) equal to 8 but which may range from 6 to 10.
  • the guiding hole 4 has an apex angle at least approximately equal to this value.
  • the horizontal cross sections are diamond-shaped, as shown by FIG. 3, angle B having, for instance, a value of 20.
  • the punch to be used for obtaining such a slot 3 in the head 2 of the screw by stamping is advantageously obtained (FIGS. 4 to 8) from a blank 16 including a cylindrical portion 17 and a conical projection 18 (intended to form the guiding hole 4).
  • the side faces 19, 19 of the punch are obtained by milling of part 17 by means of a milling tool 21 as shown by FIG. 7.
  • Faces 19, 19 may either be tangent to the conical surface of projection 18, as shown by FIG. 9, or intersect this conical surface as shown by the other figures. In this last case the intersection with conical projection 18 produces two flat surfaces 19 19 respectively in line with faces 19 and which intersect each other along a generatrix of conical surface 18 (FIG. 6).
  • Two small fiat surfaces 22 formed in hole 4 correspond to said surfaces 19 19
  • the axis of milling tool 21 is suitably inclined to obtain angle B and angle A.
  • the screwdriver 30 (FIG. 10) to be used with screws made as above described has a shape analogous to that of the punch to be used for making the slots in the screw heads.
  • the blade of this screwdriver comprises two faces 19 making an angle almost equal to with each other and tapering toward the blade end, these faces 19 extending to form the small faces 19 and 19 on opposite sides of conical projection 18 of the blade.
  • this projection 18 is given the shape of a convex portion of a sphere and the bottom 41 of hole 4 is of corresponding shape.
  • Screws according to the present invention can be manufactured in great quantities by stamping owing to the inclination of the slot side walls and also to the great strength of the corresponding punch which further produces a correct distribution of the metal of the screw head when it is deformed.
  • end portion of the screwdriver blade is of great rigidity owing to its diamond-shaped cross section.
  • the screw can be held at the end of the screwdriver screw head slot is very easy owing to the guiding of projection 18 in hole 4, as illustrated by FIGS. 11 to 13.
  • the respective depths h and k (FIG. 1) of slot 3 and hole 4 have been supposed in the example shown to be of the same order of magnitude, but they might be different.
  • the depth k of hole 4 (and the corresponding length of projection 18) might be greater than h with respect to said axis as the generatrices of the surface of said frusto-conical axial projection, said two planes intersecting said frusto-conical surface.
  • the punch for obtaining the slot in the screw head and the screwdriver will be made of the same dimensions and the retraction of the metal of the screw after heating due to the stamping operation will somewhat reduce the dimensions of the recesses formed in the screw head.
  • the shape of the screw head is not at all limited to the countersunk shape illustrated by the drawmg.
  • a screwdriver comprising a blade having an axis of symmetry in its longitudinal direction, said blade being of substantially diamond-shaped cross section in planes perpendicular to said axis, said blade having opposed side walls tapering at an acute angle toward an end thereof, said blade end including a centrally located frusto-conical axial projection the apex angle of which is at least approximately equal to the acute angle of taper between the opposed side walls, each of said side walls comprising two flat surfaces located in respective planes intersecting each other along a straight line having the same inclination said axial projection, said two planes intersecting said frusto-conical surface. 7
  • a blade for a screwdriver to be used with a screw having a head wherein is a slot having a diamond-shaped cross section and a centrally located conical hole in the slot and wherein the slot and hole are of a corresponding taper; said blade being of diamond-shaped cross section and tapering toward an end thereof, said end having a centrally located conical projection of a taper corresponding to that of said hole but with a range of diameters/relative to that of said hole adapted to prevent the projection from being inserted fully into the hole and also the blade from seating fully in the slot, the walls of the blade defining the diamond-shaped cross section intersecting along a line having the same inclination with respect to the blade longitudinal axis as the generatrices of the conical projection.
  • a blade for a screwdriver to be used with a screw having a head wherein is a slot having a diamond-shaped cross section and a centrally located conical hole in the slot and wherein the slot and hole are of a corresponding jtaperi said blade being of diamond-shaped cross section and tapering toward an end thereof, said end having a centrally located conical projection of a taper corresponding to that of said hole but with a range of diameters relative to that of said hole adapted to prevent the projection from being inserted fully into the hole and also the'blade from seating fully inthe slot, the walls of the blade defining the diamond-shaped cross section intersecting along a generatrix of the conical projection.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Connection Of Plates (AREA)
  • Forging (AREA)
  • Drilling Tools (AREA)
US182790A 1961-03-31 1962-03-27 Screwdriver blade Expired - Lifetime US3175593A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US413836A US3273442A (en) 1961-03-31 1964-11-25 Screws

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR857520A FR1301266A (fr) 1961-03-31 1961-03-31 Perfectionnements apportés aux moyens du genre de ceux pour assurer la manoeuvre en rotation d'organes tels que vis ou analogues

Publications (1)

Publication Number Publication Date
US3175593A true US3175593A (en) 1965-03-30

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ID=8752199

Family Applications (1)

Application Number Title Priority Date Filing Date
US182790A Expired - Lifetime US3175593A (en) 1961-03-31 1962-03-27 Screwdriver blade

Country Status (7)

Country Link
US (1) US3175593A (sv)
BE (1) BE615361A (sv)
CH (1) CH385563A (sv)
DE (2) DE1960919U (sv)
FR (1) FR1301266A (sv)
GB (1) GB955044A (sv)
NL (1) NL276619A (sv)

Cited By (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463209A (en) * 1965-05-17 1969-08-26 Romain Podolsky Screw fasteners
US3470786A (en) * 1965-07-01 1969-10-07 Martins Boerge Turnable devices
US3891017A (en) * 1973-03-15 1975-06-24 Marian Iskra Combination screw and screwdriver with axial guide spigot
US3985170A (en) * 1974-08-17 1976-10-12 Marian Iskra Screwdriver
US4325153A (en) * 1979-10-22 1982-04-20 Charles Finnegan Combined screwdriver and boring apparatus
US4528874A (en) * 1983-01-17 1985-07-16 Dunn J Malcolm Screw fasteners and drivers
US5347893A (en) * 1993-02-26 1994-09-20 Snap-On Incorporated Arcuate tip driver
EP1039151A1 (en) * 1997-12-10 2000-09-27 Katsuyuki Totsu Combination of screw with driver bit or wrench
US6736579B2 (en) * 1998-02-18 2004-05-18 Volvo Personvagnar Ab Screw device and assembly for theft-proofing vehicle wheels
US6886431B1 (en) * 2002-09-16 2005-05-03 Anthony Petrsorich Combination screw driver blade tip and cooperating interlocking screw slot
US20050178250A1 (en) * 2004-02-17 2005-08-18 Hills Jeffrey M. Tool element and screw for mating engagement therewith
US20070043379A1 (en) * 2005-08-04 2007-02-22 Medtronic, Inc. Bone screw/driver assembly and method
US20080051778A1 (en) * 2004-04-21 2008-02-28 Gabriel Surma Apparatus for securing a sensor to a surgical instrument for use in computer guided orthopaedic surgery
US20080240884A1 (en) * 2007-03-27 2008-10-02 Dahners Laurence E Locking device
US20090145270A1 (en) * 2007-12-05 2009-06-11 Heesch Gary V Torque reducing and stabilizing screwdrivers and slotted threaded fasteners and related methods
US20120279364A1 (en) * 2011-05-06 2012-11-08 David Baker, Inc. Screwdriver Blade with Inclined Drive Surfaces and Method of Manufacturing
USD754513S1 (en) * 2010-02-05 2016-04-26 Milwaukee Electric Tool Corporation Screwdriver head
USD803023S1 (en) * 2016-04-07 2017-11-21 Wayne Anderson Tool tip
CN108488180A (zh) * 2018-05-21 2018-09-04 中国电建集团中南勘测设计研究院有限公司 一种对中底盘的保护螺栓及开启装置、保护结构
TWI811595B (zh) * 2019-12-20 2023-08-11 奧地利商阿維奧公司 螺釘頭驅動裝置、用於在螺釘頭中形成螺釘頭插口的成型工具及螺釘和螺釘頭驅動裝置的套件

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2123509B (en) * 1982-06-25 1986-01-29 Atomic Energy Authority Uk Screw fasteners
GB2225547A (en) * 1988-11-30 1990-06-06 John Herbert Thomsett Screwdriver and screw
FR2735677B1 (fr) * 1995-06-26 1997-12-26 Landanger Landos Ensemble tournevis et vis destine a la microchirurgie du type maxillo-faciale
GB2354566A (en) * 1999-09-22 2001-03-28 Connor Edward O Screwdriver with locating peg
DE102013113135A1 (de) * 2013-11-27 2015-05-28 Kreidler Medizintechnik Gmbh Schraube insbesondere Knochenschraube und ein Werkzeug hierfür

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US52631A (en) * 1866-02-13 Improvement in screws and bolts
US1797390A (en) * 1929-02-04 1931-03-24 Frederick H Wood Screw driver designed to be keyed on a screw
US2058197A (en) * 1935-12-12 1936-10-20 Maxwell A West Screw
CH192195A (de) * 1936-03-30 1937-07-31 Scheitlin Alexander Einrichtung zur Verhinderung des Abgleitens des Schraubenziehers beim Anziehen von Schlitzkopfschrauben.
US2140449A (en) * 1937-02-10 1938-12-13 Continental Screw Company Screw with socketed head and plurality of slots
US2141072A (en) * 1937-12-23 1938-12-20 Upson Brothers Inc Screw driver
US2193477A (en) * 1938-11-15 1940-03-12 Vellier William A De Screw
US2238960A (en) * 1938-09-01 1941-04-22 Waterbury Farrel Foundry Co Method of producing socketed articles
US2323018A (en) * 1941-06-19 1943-06-29 Vellier William A De Screw driver
US2458391A (en) * 1947-07-26 1949-01-04 Lavietes David Paul Screw and driver
US2745120A (en) * 1949-07-11 1956-05-15 Rudolph M Vaughn Method of milling an undercut slot in a screw head

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE418916A (sv) * 1935-12-12
US2322509A (en) * 1941-06-18 1943-06-22 Screw
US2474994A (en) * 1942-12-30 1949-07-05 American Screw Co Screw socket

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US52631A (en) * 1866-02-13 Improvement in screws and bolts
US1797390A (en) * 1929-02-04 1931-03-24 Frederick H Wood Screw driver designed to be keyed on a screw
US2058197A (en) * 1935-12-12 1936-10-20 Maxwell A West Screw
CH192195A (de) * 1936-03-30 1937-07-31 Scheitlin Alexander Einrichtung zur Verhinderung des Abgleitens des Schraubenziehers beim Anziehen von Schlitzkopfschrauben.
US2140449A (en) * 1937-02-10 1938-12-13 Continental Screw Company Screw with socketed head and plurality of slots
US2141072A (en) * 1937-12-23 1938-12-20 Upson Brothers Inc Screw driver
US2238960A (en) * 1938-09-01 1941-04-22 Waterbury Farrel Foundry Co Method of producing socketed articles
US2193477A (en) * 1938-11-15 1940-03-12 Vellier William A De Screw
US2323018A (en) * 1941-06-19 1943-06-29 Vellier William A De Screw driver
US2458391A (en) * 1947-07-26 1949-01-04 Lavietes David Paul Screw and driver
US2745120A (en) * 1949-07-11 1956-05-15 Rudolph M Vaughn Method of milling an undercut slot in a screw head

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463209A (en) * 1965-05-17 1969-08-26 Romain Podolsky Screw fasteners
US3470786A (en) * 1965-07-01 1969-10-07 Martins Boerge Turnable devices
US3891017A (en) * 1973-03-15 1975-06-24 Marian Iskra Combination screw and screwdriver with axial guide spigot
US3985170A (en) * 1974-08-17 1976-10-12 Marian Iskra Screwdriver
US4325153A (en) * 1979-10-22 1982-04-20 Charles Finnegan Combined screwdriver and boring apparatus
US4528874A (en) * 1983-01-17 1985-07-16 Dunn J Malcolm Screw fasteners and drivers
US5347893A (en) * 1993-02-26 1994-09-20 Snap-On Incorporated Arcuate tip driver
US5367926A (en) * 1993-02-26 1994-11-29 Snap-On Incorporated Arcuate tip driver
EP1039151A1 (en) * 1997-12-10 2000-09-27 Katsuyuki Totsu Combination of screw with driver bit or wrench
EP1039151A4 (en) * 1997-12-10 2002-05-08 Katsuyuki Totsu SCREW COMBINED WITH SCREWDRIVER BLADE OR KEY
US6736579B2 (en) * 1998-02-18 2004-05-18 Volvo Personvagnar Ab Screw device and assembly for theft-proofing vehicle wheels
US6886431B1 (en) * 2002-09-16 2005-05-03 Anthony Petrsorich Combination screw driver blade tip and cooperating interlocking screw slot
US20050178250A1 (en) * 2004-02-17 2005-08-18 Hills Jeffrey M. Tool element and screw for mating engagement therewith
US7028592B2 (en) * 2004-02-17 2006-04-18 Hills Jeffrey M Tool element and screw for mating engagement therewith
US20080051778A1 (en) * 2004-04-21 2008-02-28 Gabriel Surma Apparatus for securing a sensor to a surgical instrument for use in computer guided orthopaedic surgery
US20080051797A1 (en) * 2004-04-21 2008-02-28 Gabriel Surma Apparatus for securing a sensor to a surgical instrument for use in computer guided orthopaedic surgery
US20070043379A1 (en) * 2005-08-04 2007-02-22 Medtronic, Inc. Bone screw/driver assembly and method
US20080240884A1 (en) * 2007-03-27 2008-10-02 Dahners Laurence E Locking device
US20090145270A1 (en) * 2007-12-05 2009-06-11 Heesch Gary V Torque reducing and stabilizing screwdrivers and slotted threaded fasteners and related methods
USD754513S1 (en) * 2010-02-05 2016-04-26 Milwaukee Electric Tool Corporation Screwdriver head
US20120279364A1 (en) * 2011-05-06 2012-11-08 David Baker, Inc. Screwdriver Blade with Inclined Drive Surfaces and Method of Manufacturing
US8850934B2 (en) * 2011-05-06 2014-10-07 David Baker, Inc. Screwdriver blade with inclined drive surfaces and method of manufacturing
USD803023S1 (en) * 2016-04-07 2017-11-21 Wayne Anderson Tool tip
USD826679S1 (en) * 2016-04-07 2018-08-28 Wayne Anderson Tool tip
CN108488180A (zh) * 2018-05-21 2018-09-04 中国电建集团中南勘测设计研究院有限公司 一种对中底盘的保护螺栓及开启装置、保护结构
CN108488180B (zh) * 2018-05-21 2024-03-12 中国电建集团中南勘测设计研究院有限公司 一种对中底盘的保护螺栓及开启装置、保护结构
TWI811595B (zh) * 2019-12-20 2023-08-11 奧地利商阿維奧公司 螺釘頭驅動裝置、用於在螺釘頭中形成螺釘頭插口的成型工具及螺釘和螺釘頭驅動裝置的套件

Also Published As

Publication number Publication date
DE1960919U (de) 1967-05-24
GB955044A (en) 1964-04-08
DE1675656B1 (de) 1970-04-23
BE615361A (fr) 1962-07-16
CH385563A (fr) 1964-12-15
NL276619A (sv)
FR1301266A (fr) 1962-08-17

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