US3891017A - Combination screw and screwdriver with axial guide spigot - Google Patents
Combination screw and screwdriver with axial guide spigot Download PDFInfo
- 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
- Authority
- US
- United States
- Prior art keywords
- spigot
- bore
- screwdriver
- screw
- slot
- 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
Links
- 239000000463 material Substances 0.000 claims description 6
- 230000006378 damage Effects 0.000 description 7
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
- Connection Of Plates (AREA)
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 combination of a screw and screwdriver of the above type is described, preferably 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.
Description
United States Patent 11 1 Iskra [4 1 June 24, 1975 COMBINATION SCREW AND SCREWDRIVER WITH AXIAL GUIDE SPIGOT [76] Inventor: Marian Iskra, Little Sutton Rd.,
Four Oaks, Sutton Coldfield, Warwickshire, England [22] Filed: Feb. 22, 1974 [21] Appl. No.: 444,867
[] Foreign Application Priority Data Mar. 15, 1973 United Kingdom 12536/73 [52] US. Cl 145/50 A [51] Int. Cl B25b 15/02 [58] Field of Search 145/50 A, D; 81/532 [56] References Cited UNITED STATES PATENTS 1,797,390 3/1931 Wood /50 A 3,175,593 3/1965 Launay.... 145/50 A 3,216,292 11/1965 Flegal 81/532 FOREIGN PATENTS OR APPLICATIONS 1,476 4/1875 United Kingdom 145/50 A 375,680 4/1964 Switzerland 145/50 A Primary Examiner-Donald G. Kelly Assistant ExaminerMarc R. Davidson I Attorney, Agent, or Firm-Norris & Bateman 57] 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 combination of a screw and screwdriver of the above type is described, preferably 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.
5 Claims, 6 Drawing Figures 1 COMBINATION SCREW AND SCREWDRIVER WITH AXIAL GUIDE SPIGOT This invention relates to screwdrivers and screws for use therewith, particularly hand screwdrivers, although it is contemplated that the invention also has application to screwdriver bits for use in power tools and automatic machines and the term screwdriver blade is used hereinafter to include such bits except where the context shows otherwise.
The disadvantages of the conventional flat bladed screwdriver used by engagement merely in a diametral slot of the screw head are well known, there is nothing to control axial alignment of the blade and screw, slipping can easily occur which may damage surrounding surfaces, and application of out-of-line torque or the use of incorrectly sized, worn, or inaccurately ground blades often causes damage to the screw, making the head unsightly and in some cases making its removal difficult or impossible. In order to overcome these disadvantages various modified forms of screw head and screwdriver have been developed, but in many cases these alternative arrangements give rise to other problems, for example the torque of the screwdriver blade may only be transmitted to a specifically shaped recess in a central zone of the head making damage due to excessive force more likely, the specialized blade shapes and head recesses are expensive to produce, and the shape of the recess usually precludes any application of a conventional screwdriver should the specialized blade be unavailable.
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.
A preferred embodiment of the invention is now more particularly described with reference to the accompanying drawings wherein:
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, and,
FIG. 6 is a side elevation of the head of the screw.
Referring firstly to FIGS. 1 and 2, 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.
Even when the screw has been driven home'several times its head should remain unmarked and there will be no damage to surrounding surfaces. The risk of injury to an operators fingers is also minimized.
It has been found in practice that 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.
Preferably, 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.
As the guide bore of the screws may extend beyond the head into their shanks 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.
I claim:
1. The combination of 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.
2. The combination according to claim 1 wherein the axial bore is somewhat greater in depth than the length of the spigot.
3. The combination according to claim 1 wherein the length of the axial bore is at least twice the depth of the slot.
4. The combination according to claim 1 wherein the cross-sectional area of the material of the screw around or adjacent to the bore is not less than the crosssectional area of the material at the thread roots.
5. The combination according to claim 1 wherein the screw is a countersunk-headed woodscrew.
Claims (5)
1. The combination of 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.
2. The combination according to claim 1 wherein the axial bore is somewhat greater in depth than the length of the spigot.
3. The combination according to claim 1 wherein the length of the axial bore is at least twice the depth of the slot.
4. The combination according to claim 1 wherein the cross-sectional area of the material of the screw around or adjacent to the bore is not less than the cross-sectional area of the material at the thread roots.
5. The combination according to claim 1 wherein the screw is a countersunk-headed woodscrew.
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 (en) |
CA (1) | CA1006722A (en) |
DE (1) | DE2410662A1 (en) |
ES (1) | ES424305A1 (en) |
FR (1) | FR2221238B1 (en) |
GB (1) | GB1455003A (en) |
IT (1) | IT1010699B (en) |
Cited By (24)
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 |
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 |
US6128983A (en) * | 1999-01-06 | 2000-10-10 | Arnn; Edward T. | Drive tool for fasteners |
WO2003002307A1 (en) * | 2001-06-28 | 2003-01-09 | Ortho Development Corporation | Interference fit screw driver |
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 |
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 (en) * | 2022-05-12 | 2022-11-23 | Акционерное общество "Государственный Рязанский приборный завод" | Adapter head with guide lock for fasteners |
US11638987B2 (en) | 2017-12-01 | 2023-05-02 | Milwaukee Electric Tool Corporation | Wear resistant tool bit |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4073210A (en) * | 1976-09-10 | 1978-02-14 | Katsuyuki Totsu | Screw |
DE3337535A1 (en) * | 1983-10-14 | 1985-05-02 | Alfons 5758 Fröndenberg Knoche | Screw having an improved internal drive, a stamping die for pressing the internal drive of such a screw, and a screwdriver for this screw |
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)
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)
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. |
-
1973
- 1973-03-15 GB GB1253673A patent/GB1455003A/en not_active Expired
-
1974
- 1974-02-22 US US444867A patent/US3891017A/en not_active Expired - Lifetime
- 1974-03-06 DE DE2410662A patent/DE2410662A1/en active Pending
- 1974-03-08 FR FR7407912A patent/FR2221238B1/fr not_active Expired
- 1974-03-14 CA CA194,948A patent/CA1006722A/en not_active Expired
- 1974-03-15 ES ES424305A patent/ES424305A1/en not_active Expired
- 1974-03-15 IT IT12607/74A patent/IT1010699B/en active
Patent Citations (3)
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 (44)
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 |
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 |
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 |
US20030093081A1 (en) * | 2001-06-28 | 2003-05-15 | Ortho Development Corporation; | Interference fit screw driver |
WO2003002307A1 (en) * | 2001-06-28 | 2003-01-09 | Ortho Development Corporation | Interference fit screw driver |
US6886431B1 (en) * | 2002-09-16 | 2005-05-03 | Anthony Petrsorich | Combination screw driver blade tip and cooperating interlocking screw slot |
US20040177729A1 (en) * | 2003-03-10 | 2004-09-16 | Jory Bell | Screw and screw driver |
US20040221691A1 (en) * | 2003-03-10 | 2004-11-11 | Jory Bell | Screw and screw driver |
US20040221692A1 (en) * | 2003-03-10 | 2004-11-11 | Jory Bell | Screw and screw driver |
US20050135898A1 (en) * | 2003-03-10 | 2005-06-23 | 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 |
USD631723S1 (en) | 2008-11-07 | 2011-02-01 | Milwaukee Electric Tool Corporation | Insert bit |
USD663187S1 (en) | 2008-11-07 | 2012-07-10 | Milwaukee Electric Tool Corporation | Tool bit |
US10065294B2 (en) | 2008-11-07 | 2018-09-04 | Milwaukee Electric Tool Corporation | Tool bit |
USD623036S1 (en) | 2008-11-07 | 2010-09-07 | 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 |
USD662802S1 (en) | 2008-11-07 | 2012-07-03 | Milwaukee Electric Tool Corporation | Tool bit |
US9849570B2 (en) | 2008-11-07 | 2017-12-26 | Milwaukee Electric Tool Corporation | Tool bit |
US8418587B2 (en) | 2008-11-07 | 2013-04-16 | Milwaukee Electric Tool Corporation | Tool bit |
US11407090B2 (en) | 2008-11-07 | 2022-08-09 | Milwaukee Electric Tool Corporation | Tool bit |
US8800407B2 (en) | 2008-11-07 | 2014-08-12 | Milwaukee Electric Tool Corporation | Method of manufacturing a tool bit |
US20100192736A1 (en) * | 2009-02-05 | 2010-08-05 | Wade Burch | Screwdriver |
US8621961B2 (en) | 2009-04-28 | 2014-01-07 | Milwaukee Electric Tool Corporation | Multi-purpose tool |
US20100269263A1 (en) * | 2009-04-28 | 2010-10-28 | Wade Burch | 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 |
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 (en) * | 2022-05-12 | 2022-11-23 | Акционерное общество "Государственный Рязанский приборный завод" | Adapter head with guide lock for fasteners |
Also Published As
Publication number | Publication date |
---|---|
FR2221238A1 (en) | 1974-10-11 |
FR2221238B1 (en) | 1978-08-11 |
GB1455003A (en) | 1976-11-10 |
DE2410662A1 (en) | 1974-09-26 |
IT1010699B (en) | 1977-01-20 |
CA1006722A (en) | 1977-03-15 |
ES424305A1 (en) | 1976-06-01 |
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