US3891017A - Combination screw and screwdriver with axial guide spigot - Google Patents

Combination screw and screwdriver with axial guide spigot Download PDF

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Publication number
US3891017A
US3891017A US444867A US44486774A US3891017A US 3891017 A US3891017 A US 3891017A US 444867 A US444867 A US 444867A US 44486774 A US44486774 A US 44486774A US 3891017 A US3891017 A US 3891017A
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US
United States
Prior art keywords
spigot
bore
screwdriver
screw
slot
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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
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US444867A
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English (en)
Inventor
Marian Iskra
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Individual
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Individual
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Publication of US3891017A publication Critical patent/US3891017A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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

Definitions

  • ABSTRACT For use with screws having a slotted head and a central axial bore, a screwdriver blade is provided with a diametral blade tip and a central guide spigot extending axially beyond the tip and of greater cross-section than the top width.
  • the spigot which may be cylindrical or of square cross-section, serves to maintain the screw in co-axial relationship with the screwdriver and prevents the blade slipping out of the slot in use.
  • the spigot is of less length than the depth of the axial bore to prevent bottoming therein and, in the case of the square-section spigot it is sized to be a press fit in the bore so that the corners bite into the bore wall for more positive location.
  • the object of the invention is to provide an improved screwdriver, and screws for use therewith, which is of particularly simple construction, yet which is effective in use in providing positive and safe driving engagement without risk of slipping, with transmission of maximum torque, and, in the case of the screws, without preventing use of a conventional flat blade.
  • a further object is to provide a screwdriver blade which comprises a straight edged diametrally extending blade tip for rotational driving engagement with a parallel-sided slot of a screwhead, and a central guide spigot projecting axially substantially beyond the blade tip and having a square lateral cross section substantially greater in width throughout its length than the width of said tip for engagement in an axial guide bore of the screw; said bore being of greater depth than the slot and of a constant diameter throughout its length, which diameter is greater than the width of the slot for mating engagement with the spigot of the screwdriver blade.
  • FIG. 1 is a side elevation of a screwdriver blade
  • FIG. 2 is an end view thereof
  • FIG. 3 is an axial section of a screw for use with the screwdriver of FIG. 1,
  • FIG. 4 is an end view of said screw
  • FIG. 5 is a perspective view of the screwdriver blade
  • FIG. 6 is a side elevation of the head of the screw.
  • a screwdriver blade 10 has a cylindrical shank 11, one end of which (not shown) is releasably or permanently mounted in a handle for manual use, or is operatively engaged by a chuck or the like of a power tool.
  • the acting end of shank 11 is tapered to form a tip 12 having a transverse straight edge 13 extending across the full diameter of the shank in the manner of a conventional screwdriver blade; and on the axis of the shank there is provided a central square section guide spigot 14 projecting axially beyond the blade edge and having a width greater than the thickness of the tip 12 at the edge 13 as best seen in FIG. 5.
  • Screws for use with this screwdriver may have conventional head profiles, e.g., round, cheese-head, etc.
  • FIGS. 3, 4 and 6 illustrate one example, a woodscrew having a countersunk head 15 which is provided with a transverse diametral slot 16 in the manner of a conventional screw (thus the conventional flat screwdriver blade can be employed if necessary although it is preferred to use the screwdriver of the invention).
  • Head 15 is provided with a central axial cylindrical bore 17 whose diameter is somewhat greater than the width of slot 16 and which extends axially into the head to a distance preferably at least twice the depth of slot 16.
  • Bore 17 has a diameter substantially equivalent to the diagonal cross-sectional dimension X of spigot 14 of the screwdriver blade, and the depth of bore 17 provides a slight clearance ensuring that spigot 14 does not bottom therein, to ensure that the blade edge 13 seats fully in the slot 16 in use.
  • the guide spigot 14 enables the screw to be carried on the blade into inaccessible positions which cannot be reached by hand. Moreover, spigot 14 positively maintains the screw in true co-axial alignment with the screwdriver shank 11 so that the screw is easily started at the desired angle with the workpiece (particularly in the case of woodscrews or self-tapping screws) and/or is easily correctly mated with existing threads in the workpiece if being driven into a pretapped bore.
  • the screw can then be rapidly and positively driven home without special care or effort on the part of the user as the blade cannot easily be displaced from its engagement with the screw while axial pressure is being applied, thus misalignment and consequent damage is avoided.
  • the invention is particularly convenient in driving woodscrews home into wood-work rapidly and accurately in almost any situation as in the assembly of furniture and interior fitments, a pump type of screwdriver can be used without fear of slipping or damage.
  • the invention may also facilitate the removal of tight or rusted screws.
  • spigot 14 is very slightly tapered towards its free end and bore 17 is dimensioned to be a press fit thereon, thus when the screwdriver is first engaged with the screw, the corners of spigot 14 bite slightly into the wall of bore 17 and locate the screw positively on the end of the screwdriver blade, thus the screw may be carried on the blade into a position otherwise difficult of access without fear of the screw dropping off.
  • the square section spigot 14 facilitates manufacture of the screwdriver in that the machining necessary to provide a cylindrical spigot is avoided, and it can be forged or otherwise shaped by the same processes used to form the remaining parts of the blade tip.
  • the dimensions are preferably chosen so that there is not excessive weakness at this point, the cross-sectional area of the screw material around or adjacent to the bore should be not less than the cross section of the material at the thread roots so that maximum strength is provided.
  • a screw having a head including a transverse parallel-sided slot and a central axial cylindrical bore of greater depth than the slot and of constant diameter throughout its length, which diameter is greater than the width of the slot; and a screwdriver blade comprising a straight edged diametrally extending blade tip for rotational driving engagement with said slot and a central guide spigot porjecting axially substantially beyond the blade tip for operative entry into said axial bore and having a square lateral cross-section substantially greater in width throughout its length than the width of said tip for engagement in said axial bore, the diagonal of said spigot being substantially equal to the diameter of the axial bore, and said spigot being slightly tapered toward its free end and dimensioned to have a press fit in said bore, whereby the corners of said spigot are adapted to have biting engagement with the wall of said axial bore.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Connection Of Plates (AREA)
US444867A 1973-03-15 1974-02-22 Combination screw and screwdriver with axial guide spigot Expired - Lifetime US3891017A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1253673A GB1455003A (en) 1973-03-15 1973-03-15 Screwdrivers and screws for use therewith

Publications (1)

Publication Number Publication Date
US3891017A true US3891017A (en) 1975-06-24

Family

ID=10006432

Family Applications (1)

Application Number Title Priority Date Filing Date
US444867A Expired - Lifetime US3891017A (en) 1973-03-15 1974-02-22 Combination screw and screwdriver with axial guide spigot

Country Status (7)

Country Link
US (1) US3891017A (enExample)
CA (1) CA1006722A (enExample)
DE (1) DE2410662A1 (enExample)
ES (1) ES424305A1 (enExample)
FR (1) FR2221238B1 (enExample)
GB (1) GB1455003A (enExample)
IT (1) IT1010699B (enExample)

Cited By (30)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985170A (en) * 1974-08-17 1976-10-12 Marian Iskra Screwdriver
US4314489A (en) * 1979-11-15 1982-02-09 Aldo Arcangeli Screwdrivers
US4434687A (en) 1982-11-01 1984-03-06 Vi-Tek Designs, Inc. Damaged screw remover
US4528874A (en) * 1983-01-17 1985-07-16 Dunn J Malcolm Screw fasteners and drivers
US5210895A (en) * 1992-03-02 1993-05-18 Hull Harold L Combined screwdriver and file
US5347893A (en) * 1993-02-26 1994-09-20 Snap-On Incorporated Arcuate tip driver
USD371946S (en) 1994-12-01 1996-07-23 James Giblin Screwdriver
US6128983A (en) * 1999-01-06 2000-10-10 Arnn; Edward T. Drive tool for fasteners
USD453289S1 (en) 2001-03-12 2002-02-05 Sidney R. Campbell Screwdriver bit head
WO2003002307A1 (en) * 2001-06-28 2003-01-09 Ortho Development Corporation Interference fit screw driver
USD480618S1 (en) 2002-07-17 2003-10-14 Anthony Petrsorich Combination screw driver blade tip and cooperating interlocking screw slot
US20040139829A1 (en) * 2000-03-06 2004-07-22 Felo Werkzeugfabrik Holland-Letz Gmbh Screwdriver bits
US20040177729A1 (en) * 2003-03-10 2004-09-16 Jory Bell Screw and screw driver
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
US20090145270A1 (en) * 2007-12-05 2009-06-11 Heesch Gary V Torque reducing and stabilizing screwdrivers and slotted threaded fasteners and related methods
US20100192736A1 (en) * 2009-02-05 2010-08-05 Wade Burch Screwdriver
USD623036S1 (en) 2008-11-07 2010-09-07 Milwaukee Electric Tool Corporation Insert bit
US20100269263A1 (en) * 2009-04-28 2010-10-28 Wade Burch Multi-purpose tool
US20110197721A1 (en) * 2008-11-07 2011-08-18 Debaker Joseph M Tool bit
USD659501S1 (en) * 2011-12-24 2012-05-15 Redmond Scott Wood Screwdriver bit
USD659502S1 (en) * 2011-12-24 2012-05-15 Redmond Scott Wood Screwdriver bit
US20130327188A1 (en) * 2012-06-11 2013-12-12 Roger F. Wilson Slip-resistant screwdriver for slotted screws and method for driving slotted screws
USD711719S1 (en) 2009-11-06 2014-08-26 Milwaukee Electric Tool Corporation Tool bit
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
US10022845B2 (en) 2014-01-16 2018-07-17 Milwaukee Electric Tool Corporation Tool bit
USD921468S1 (en) 2018-08-10 2021-06-08 Milwaukee Electric Tool Corporation Driver bit
RU214985U1 (ru) * 2022-05-12 2022-11-23 Акционерное общество "Государственный Рязанский приборный завод" Головка-переходник с направляющим фиксатором для крепежных элементов
US11638987B2 (en) 2017-12-01 2023-05-02 Milwaukee Electric Tool Corporation Wear resistant tool bit

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4073210A (en) * 1976-09-10 1978-02-14 Katsuyuki Totsu Screw
DE3337535A1 (de) * 1983-10-14 1985-05-02 Alfons 5758 Fröndenberg Knoche Schraube mit verbesserten innenantrieb, praegestempel zum pressen des innenantriebs einer derartigen schraube und schraubendreher fuer diese schraube
GB2225547A (en) * 1988-11-30 1990-06-06 John Herbert Thomsett Screwdriver and screw
GB2285940A (en) * 1994-01-27 1995-08-02 Malcolm Turner Fastening system

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1797390A (en) * 1929-02-04 1931-03-24 Frederick H Wood Screw driver designed to be keyed on a screw
US3175593A (en) * 1961-03-31 1965-03-30 Launay Pierre Screwdriver blade
US3216292A (en) * 1964-03-20 1965-11-09 William D Flegal Parallel edge broken pipe or bolt extractor

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB190001476A (en) * 1900-01-23 1900-03-17 Josiah Pearce Improvements in Finishing Tools for Facing Piston Rings.

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1797390A (en) * 1929-02-04 1931-03-24 Frederick H Wood Screw driver designed to be keyed on a screw
US3175593A (en) * 1961-03-31 1965-03-30 Launay Pierre Screwdriver blade
US3216292A (en) * 1964-03-20 1965-11-09 William D Flegal Parallel edge broken pipe or bolt extractor

Cited By (50)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3985170A (en) * 1974-08-17 1976-10-12 Marian Iskra Screwdriver
US4314489A (en) * 1979-11-15 1982-02-09 Aldo Arcangeli Screwdrivers
US4434687A (en) 1982-11-01 1984-03-06 Vi-Tek Designs, Inc. Damaged screw remover
US4528874A (en) * 1983-01-17 1985-07-16 Dunn J Malcolm Screw fasteners and drivers
US5210895A (en) * 1992-03-02 1993-05-18 Hull Harold L Combined screwdriver and file
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
USD371946S (en) 1994-12-01 1996-07-23 James Giblin Screwdriver
US6128983A (en) * 1999-01-06 2000-10-10 Arnn; Edward T. Drive tool for fasteners
US20040139829A1 (en) * 2000-03-06 2004-07-22 Felo Werkzeugfabrik Holland-Letz Gmbh Screwdriver bits
US7168348B2 (en) * 2000-03-06 2007-01-30 Felo Werkzeugfabrik Holland-Letz Gmbh Screwdriver bits
USD453289S1 (en) 2001-03-12 2002-02-05 Sidney R. Campbell Screwdriver bit head
WO2003002307A1 (en) * 2001-06-28 2003-01-09 Ortho Development Corporation Interference fit screw driver
US20030093081A1 (en) * 2001-06-28 2003-05-15 Ortho Development Corporation; Interference fit screw driver
USD480618S1 (en) 2002-07-17 2003-10-14 Anthony Petrsorich Combination screw driver blade tip and cooperating interlocking screw slot
US6886431B1 (en) * 2002-09-16 2005-05-03 Anthony Petrsorich Combination screw driver blade tip and cooperating interlocking screw slot
US20040221692A1 (en) * 2003-03-10 2004-11-11 Jory Bell Screw and screw driver
US20040177729A1 (en) * 2003-03-10 2004-09-16 Jory Bell Screw and screw driver
US20050135898A1 (en) * 2003-03-10 2005-06-23 Jory Bell Screw and screw driver
US20040221691A1 (en) * 2003-03-10 2004-11-11 Jory Bell Screw and screw driver
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
US20090145270A1 (en) * 2007-12-05 2009-06-11 Heesch Gary V Torque reducing and stabilizing screwdrivers and slotted threaded fasteners and related methods
US11407090B2 (en) 2008-11-07 2022-08-09 Milwaukee Electric Tool Corporation Tool bit
USD623036S1 (en) 2008-11-07 2010-09-07 Milwaukee Electric Tool Corporation Insert bit
US8800407B2 (en) 2008-11-07 2014-08-12 Milwaukee Electric Tool Corporation Method of manufacturing a tool bit
USD631723S1 (en) 2008-11-07 2011-02-01 Milwaukee Electric Tool Corporation Insert bit
US20110197721A1 (en) * 2008-11-07 2011-08-18 Debaker Joseph M Tool bit
USD646547S1 (en) 2008-11-07 2011-10-11 Milwaukee Electric Tool Corporation Tool bit
US10065294B2 (en) 2008-11-07 2018-09-04 Milwaukee Electric Tool Corporation Tool bit
US9849570B2 (en) 2008-11-07 2017-12-26 Milwaukee Electric Tool Corporation Tool bit
USD662802S1 (en) 2008-11-07 2012-07-03 Milwaukee Electric Tool Corporation Tool bit
USD663187S1 (en) 2008-11-07 2012-07-10 Milwaukee Electric Tool Corporation Tool bit
US8418587B2 (en) 2008-11-07 2013-04-16 Milwaukee Electric Tool Corporation Tool bit
US20100192736A1 (en) * 2009-02-05 2010-08-05 Wade Burch Screwdriver
US20100269263A1 (en) * 2009-04-28 2010-10-28 Wade Burch Multi-purpose tool
US8621961B2 (en) 2009-04-28 2014-01-07 Milwaukee Electric Tool Corporation Multi-purpose tool
USD711719S1 (en) 2009-11-06 2014-08-26 Milwaukee Electric Tool Corporation Tool bit
USD754513S1 (en) 2010-02-05 2016-04-26 Milwaukee Electric Tool Corporation Screwdriver head
USD659501S1 (en) * 2011-12-24 2012-05-15 Redmond Scott Wood Screwdriver bit
USD659502S1 (en) * 2011-12-24 2012-05-15 Redmond Scott Wood Screwdriver bit
US20130327188A1 (en) * 2012-06-11 2013-12-12 Roger F. Wilson Slip-resistant screwdriver for slotted screws and method for driving slotted screws
US10022845B2 (en) 2014-01-16 2018-07-17 Milwaukee Electric Tool Corporation Tool bit
USD826679S1 (en) * 2016-04-07 2018-08-28 Wayne Anderson Tool tip
USD803023S1 (en) * 2016-04-07 2017-11-21 Wayne Anderson Tool tip
US11638987B2 (en) 2017-12-01 2023-05-02 Milwaukee Electric Tool Corporation Wear resistant tool bit
US11958168B2 (en) 2017-12-01 2024-04-16 Milwaukee Electric Tool Corporation Wear resistant tool bit
USD921468S1 (en) 2018-08-10 2021-06-08 Milwaukee Electric Tool Corporation Driver bit
USD955843S1 (en) 2018-08-10 2022-06-28 Milwaukee Electric Tool Corporation Driver bit
RU214985U1 (ru) * 2022-05-12 2022-11-23 Акционерное общество "Государственный Рязанский приборный завод" Головка-переходник с направляющим фиксатором для крепежных элементов

Also Published As

Publication number Publication date
GB1455003A (en) 1976-11-10
CA1006722A (en) 1977-03-15
FR2221238A1 (enExample) 1974-10-11
IT1010699B (it) 1977-01-20
ES424305A1 (es) 1976-06-01
DE2410662A1 (de) 1974-09-26
FR2221238B1 (enExample) 1978-08-11

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