US3897812A - Screw driver - Google Patents

Screw driver Download PDF

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Publication number
US3897812A
US3897812A US473840A US47384074A US3897812A US 3897812 A US3897812 A US 3897812A US 473840 A US473840 A US 473840A US 47384074 A US47384074 A US 47384074A US 3897812 A US3897812 A US 3897812A
Authority
US
United States
Prior art keywords
blade
shank
screw
slot
foot portion
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
US473840A
Other languages
English (en)
Inventor
Edward T Arnn
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to US473840A priority Critical patent/US3897812A/en
Priority to US486487A priority patent/US3913647A/en
Priority to US491361A priority patent/US3923088A/en
Priority to GB19480/75A priority patent/GB1498684A/en
Priority to SE7505508A priority patent/SE423341B/xx
Priority to DE2522729A priority patent/DE2522729C2/de
Priority to AU81515/75A priority patent/AU495411B2/en
Priority to FR7516443A priority patent/FR2272795B3/fr
Priority to CA227,848A priority patent/CA1025253A/en
Priority to BE156817A priority patent/BE829614A/xx
Priority to JP50063996A priority patent/JPS5743387B2/ja
Application granted granted Critical
Publication of US3897812A publication Critical patent/US3897812A/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
    • B25B15/005—Screwdrivers characterised by material or shape of the tool bit characterised by cross-section with cross- or star-shaped cross-section
    • 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

Definitions

  • the invention of this application is a rugged, inexpensive. readily constructed and easily employed screw driver which overcomes all of the defects of prior art screw drivers.
  • the present invention relates to a screw driver including a blade which terminates in a lower foot portion which in turn protrudes outwardly from the blade faces to provide a gripping means.
  • the gripping means imbeds itself into the sidewalls of the slot in a screw head to prevent the blade from slipping out of the slot as the screw driver is turned.
  • the invention includes a screw driver comprising a shank portion and a blade portion integral therewith, the blade portion having generally converging sides and generally converging edges terminating integral with a foot portion, said blade including torque transmitting ribs integral with said sides along the opposed edges of said blade, said foot portion delining the lower most portion of said blade and being generally isosceles trapezoidal in crosssection with its widest base portion lying in a plane perpendicular to the axis of said shank and being engageable with the bottom of a slot in a screw head and its inwardly tapered sidewalls extending across the entire width of the blade and being engageable with the parallel sidewalls of a screw head slot.
  • the junction of said base and respective inwardly tapered sidewalls define wedge like bites which cut a groove in the parallel sidewalls of said screw slot upon application of a torque to the shank.
  • the screw driver of this invention has been found to be capable of transmitting a torque to a screw head which is many times the torque that can be transmitted by a conventional screw driver. Also, the screw driver of this invention has been found to be resistant to being dislodged once inserted into a screw head slot and subjected to a torque.
  • the screw driver of this invention can engage a screw head from an angle other than straight on and still provide its superior torque transmitting qualities, and, lastly, the screw driver of this invention allows the user to position a screw thereon by first engaging one bite of the blade foot means in a screw head slot and then with a rocking motion engaging the other bite in the slot, whereupon the screw is removably held by the foot portion and easily positioned in a hole not otherwise accessible to a screw.
  • FIG. I is an isometric view of the screw driver of this invention.
  • FIG. 2 is a front view of the blade and shank of the screw driver of this invention.
  • FIG. 3 is a sectional view taken along lines 3-3 of FIG. 2.
  • FIG. 4 is a sectional view taken along lines 4-4 of FIG. 3.
  • FIG. 1 shows a screw driver 10 having a handle 12, a shank l4 and a blade 16.
  • the blade 16 includes a generally outwardly or diverging portion 18 and generally converging edges 20. It also includes faces 22 which are located in opposed relationship to each other on opposite sides of the blade. Included in faces 22 are cutaway portions 24 of increasing depth near the blade end and running substantially the entire length of the blade. Cutaway portions 24 define strengthening ribs 26 on either side of blade 16. Ribs 26 run generally parallel to the longitudinal axis of blade 16.
  • Ribs 26 also gener ally converge from the shank of the screw driver to the blade end, both in thickness and in width, being of greatest cross section at the point of intersection of diverging portions 18 and converging edges 20, to the blade end.
  • Blade 16 terminates in foot portion 28 which includes wedge like bites 30 on either side thereof.
  • Foot portion 28 is generally isosceles trapezoidal in cross-section diverging outwardly away from the longitudinal axis of the shank and finally terminating at a flat base 32.
  • blade 16 is of a configuration such that the strengthening ribs 26 define, in cooperation with cutaway portions 24, a blade having an I-beam cross-section when viewed in a plane perpendicular to the longitudinal axis of the shaft.
  • the screw driver of this invention In using the screw driver of this invention, one simply inserts the blade into the slot of a screw head with the base of the foot portion extending downwardly thereinto.
  • the screw driver shank is then twisted either manually with the aid ofa handle, or by mechanical means such as an electric motor arrangement, for example, a power drill and chuck.
  • the screw driver of this invention need not be inserted in the screw head so that the longitudinal axis of the shank is in line with the longitudinal axis of the screw: but rather, the axis of the shank may be slightly angled with respect to the axis of the screw since the bites 30 run the entire length of the foot portion 28 and may thus cut into the screw slot side walls at any angle. This feature is particularly advantageous when one considers the number of times screw heads are encountered where the head is not accessible from a straight on position, yet considerable torque is needed.
  • the material of construction of the screw driver can vary widely; however, a high quality steel is preferred.
  • One such steel is designated as A.I.S.l. No. A3150 and is a high carbon steel having about 0.48 0.53 percent carbon 0.70 0.90 percent MN, l.l l.40 percent nickel and 0.70 0.90 percent chromium contained there among its principal additives.
  • a screw driver comprising a shank and a blade integral therewith, the blade having generally converging sides and generally converging edges terminating integral with a foot portion, which protrudes outwardly from the incline of the blade faces to provide a gripping means, said blade including torque transmitting ribs, integral with said sides, and extending along the opposed edges of said blade terminating at said foot portion, said foot portion defining the lower most portion of said blade and being generally isosceles trapezoidal in cross-section with its base lying furthest from the shank in a substantially flat plane perpendicular to the axis of said shank at the lowest extremity of the blade thereby being engageable with the bottom of the slot in a screw head, said foot portion further having its inwardly tapered sidewalls extending across the entire width of the blade and being engageable with the parallel sidewalls of a screw head slot, said base of said foot portion and said respective inwardly tapered sidewalls defining wedge-like bits
  • a screw driver comprising a shank and a blade portion, said blade portion being of generally I cross sectional configuration in a plane perpendicular to the longitudinal axis of said shank and terminating in a blade foot portion having a generally isosceles trapezoidal cross-sectional configuration in a plane parallel with the longitudinal axis of said shank with its base lying furthest from the shank in a substantially flat plane perpendicular to the axis of said shank at the lowest extremity of the blade thereby being engageable with the bottom of a slot in a screw head, said blade foot portion further having its inwardly tapered sidewalls extending across the entire width of the blade, said base of said blade foot portion and said respective inwardly tapered sidewalls defining wedge-like bites extending outwardly beyond the incline of the blade faces and engageable with opposed sides of a screw slot to removably hold a screw thereon and cut a groove in the parallel sidewalls of a screw head slot upon application of a torque to said shank
  • a screw driver comprising: a shank having a handle attached to one end; and, a blade integral with the other, the blade having generally convergingly tapered sides and edges and including ribs formed by central cutaway portions in said sides running generally parallel to the longitudinal axis of said shank to define an I cross-section viewed in a plane perpendicular to the longitudinal axis of said shank.
  • said cutaway portions terminating at a point longitudinally spaced from the lower end of said blade; a lower terminal foot integral with said blade, said foot extending downwardly and outwardly from the sides of said blade to form wedge portions at the lower terminal of said blade engageable with opposed sides of a screw slot to removably hold a screw thereon and cut a groove in the parallel sidewalls of a screw head slot upon application of a torque to said shank.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Connection Of Plates (AREA)
US473840A 1974-05-28 1974-05-28 Screw driver Expired - Lifetime US3897812A (en)

Priority Applications (11)

Application Number Priority Date Filing Date Title
US473840A US3897812A (en) 1974-05-28 1974-05-28 Screw driver
US486487A US3913647A (en) 1974-05-28 1974-07-08 Screw driver
US491361A US3923088A (en) 1974-05-28 1974-07-24 Biting screw driver
GB19480/75A GB1498684A (en) 1974-05-28 1975-05-08 Screw drivers
SE7505508A SE423341B (sv) 1974-05-28 1975-05-14 Skruvmejsel
DE2522729A DE2522729C2 (de) 1974-05-28 1975-05-22 Schraubendreher
AU81515/75A AU495411B2 (en) 1974-05-28 1975-05-26 Screwdriver
FR7516443A FR2272795B3 (enrdf_load_stackoverflow) 1974-05-28 1975-05-27
CA227,848A CA1025253A (en) 1974-05-28 1975-05-27 Screw driver
BE156817A BE829614A (fr) 1974-05-28 1975-05-28 Tournevis
JP50063996A JPS5743387B2 (enrdf_load_stackoverflow) 1974-05-28 1975-05-28

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US473840A US3897812A (en) 1974-05-28 1974-05-28 Screw driver

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US491361A Continuation-In-Part US3923088A (en) 1974-05-28 1974-07-24 Biting screw driver

Publications (1)

Publication Number Publication Date
US3897812A true US3897812A (en) 1975-08-05

Family

ID=23881219

Family Applications (1)

Application Number Title Priority Date Filing Date
US473840A Expired - Lifetime US3897812A (en) 1974-05-28 1974-05-28 Screw driver

Country Status (8)

Country Link
US (1) US3897812A (enrdf_load_stackoverflow)
JP (1) JPS5743387B2 (enrdf_load_stackoverflow)
BE (1) BE829614A (enrdf_load_stackoverflow)
CA (1) CA1025253A (enrdf_load_stackoverflow)
DE (1) DE2522729C2 (enrdf_load_stackoverflow)
FR (1) FR2272795B3 (enrdf_load_stackoverflow)
GB (1) GB1498684A (enrdf_load_stackoverflow)
SE (1) SE423341B (enrdf_load_stackoverflow)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339971A (en) * 1978-12-13 1982-07-20 Zatorre Alfredo E Fastener and driving tool
US4625598A (en) * 1985-05-10 1986-12-02 Frank Wolfram Positive engagement screw driver tool
US4873900A (en) * 1986-12-08 1989-10-17 Massimo Ciumaga Screw driving device
US4977800A (en) * 1988-12-30 1990-12-18 Colvin David S Screwdriver blade construction
US5461944A (en) * 1986-12-08 1995-10-31 Ciumaga; Massimo Method of making a screwdriver
US6216569B1 (en) * 1999-08-17 2001-04-17 Bobby Hu Cabinet tip of a slotted screwdriver with improved engagement with a fastener slot
US6223634B1 (en) 1997-10-03 2001-05-01 Phillips Screw Company Recessed head fastener and driver systems
US6526851B1 (en) * 2002-06-14 2003-03-04 Richard D. Fuerle Undercut screw and matching bit
US20040216848A1 (en) * 2003-04-02 2004-11-04 Stancil Timothy K. Bead breaker
USD583642S1 (en) * 2007-12-31 2008-12-30 Proprietary Technologies, Inc. Screwdriver blade tip
US20090165604A1 (en) * 2007-12-31 2009-07-02 Macor Richard J Engaging portion of a screwdriver
US20140305267A1 (en) * 2013-04-10 2014-10-16 Emile Baroody No-Slip Screwdriver
USD795036S1 (en) * 2015-09-03 2017-08-22 Proprietary Technologies, Inc. Slotted screwdriver blade tip

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54119146A (en) * 1978-03-08 1979-09-14 Showa Rabaa Kagaku Kougiyou Kk Heating element
GB2218659B (en) * 1988-05-19 1992-07-15 Massimo Ciumaga Screw driving device
JPH0741118Y2 (ja) * 1989-10-04 1995-09-20 眞 西村 発熱シート
JP2709260B2 (ja) * 1993-10-15 1998-02-04 株式会社ダイリン商事 遠赤外線輻射方法
DE102006011836B3 (de) 2006-03-15 2007-10-18 Autoliv Development Ab Befestigungselement

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US697836A (en) * 1901-07-29 1902-04-15 John Gilman Gorham Screw-driver.
US1476653A (en) * 1922-05-17 1923-12-04 Joseph R Stanton Screw driver
US1741349A (en) * 1928-12-19 1929-12-31 Bridgeport Hardware Mfg Corp Screw driver
US1782981A (en) * 1929-11-29 1930-11-25 Bridgeport Hardware Mfg Corp Screw driver
US3026920A (en) * 1960-03-04 1962-03-27 Voi Shan Ind Inc Screwdriver
US3120251A (en) * 1959-11-12 1964-02-04 Voi Shan Ind Inc Screwdriver
US3405748A (en) * 1966-06-29 1968-10-15 Sorteberg Johannes Torsion tube screw driver

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE362860C (de) * 1919-12-18 1922-11-02 Orazio Vianello Schraubenzieher

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US697836A (en) * 1901-07-29 1902-04-15 John Gilman Gorham Screw-driver.
US1476653A (en) * 1922-05-17 1923-12-04 Joseph R Stanton Screw driver
US1741349A (en) * 1928-12-19 1929-12-31 Bridgeport Hardware Mfg Corp Screw driver
US1782981A (en) * 1929-11-29 1930-11-25 Bridgeport Hardware Mfg Corp Screw driver
US3120251A (en) * 1959-11-12 1964-02-04 Voi Shan Ind Inc Screwdriver
US3026920A (en) * 1960-03-04 1962-03-27 Voi Shan Ind Inc Screwdriver
US3405748A (en) * 1966-06-29 1968-10-15 Sorteberg Johannes Torsion tube screw driver

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4339971A (en) * 1978-12-13 1982-07-20 Zatorre Alfredo E Fastener and driving tool
US4625598A (en) * 1985-05-10 1986-12-02 Frank Wolfram Positive engagement screw driver tool
US4873900A (en) * 1986-12-08 1989-10-17 Massimo Ciumaga Screw driving device
US5461944A (en) * 1986-12-08 1995-10-31 Ciumaga; Massimo Method of making a screwdriver
US4977800A (en) * 1988-12-30 1990-12-18 Colvin David S Screwdriver blade construction
US6601482B2 (en) 1997-10-03 2003-08-05 Phillips Screw Company Recessed head fastener and driver systems
US6223634B1 (en) 1997-10-03 2001-05-01 Phillips Screw Company Recessed head fastener and driver systems
US20040033838A1 (en) * 1997-10-03 2004-02-19 Phillips Screw Company Punch and manufacturing method for recessed head fastener
US6216569B1 (en) * 1999-08-17 2001-04-17 Bobby Hu Cabinet tip of a slotted screwdriver with improved engagement with a fastener slot
US6526851B1 (en) * 2002-06-14 2003-03-04 Richard D. Fuerle Undercut screw and matching bit
US20040216848A1 (en) * 2003-04-02 2004-11-04 Stancil Timothy K. Bead breaker
US6955203B2 (en) * 2003-04-02 2005-10-18 Timothy Stancill Bead breaker
USD583642S1 (en) * 2007-12-31 2008-12-30 Proprietary Technologies, Inc. Screwdriver blade tip
US20090165604A1 (en) * 2007-12-31 2009-07-02 Macor Richard J Engaging portion of a screwdriver
US20140305267A1 (en) * 2013-04-10 2014-10-16 Emile Baroody No-Slip Screwdriver
USD795036S1 (en) * 2015-09-03 2017-08-22 Proprietary Technologies, Inc. Slotted screwdriver blade tip

Also Published As

Publication number Publication date
SE423341B (sv) 1982-05-03
DE2522729A1 (de) 1975-12-11
DE2522729C2 (de) 1984-03-29
FR2272795A1 (enrdf_load_stackoverflow) 1975-12-26
JPS5743387B2 (enrdf_load_stackoverflow) 1982-09-14
FR2272795B3 (enrdf_load_stackoverflow) 1978-12-29
GB1498684A (en) 1978-01-25
JPS513098A (enrdf_load_stackoverflow) 1976-01-12
SE7505508L (sv) 1975-12-01
AU8151575A (en) 1976-12-02
BE829614A (fr) 1975-09-15
CA1025253A (en) 1978-01-31

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PA Patent available for licence or sale