EP0369655A2 - Schraubenzieherspitze für Schrauben mit Phillips-Kopf - Google Patents

Schraubenzieherspitze für Schrauben mit Phillips-Kopf Download PDF

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Publication number
EP0369655A2
EP0369655A2 EP89311411A EP89311411A EP0369655A2 EP 0369655 A2 EP0369655 A2 EP 0369655A2 EP 89311411 A EP89311411 A EP 89311411A EP 89311411 A EP89311411 A EP 89311411A EP 0369655 A2 EP0369655 A2 EP 0369655A2
Authority
EP
European Patent Office
Prior art keywords
bit
recess
wings
driver
standard
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.)
Withdrawn
Application number
EP89311411A
Other languages
English (en)
French (fr)
Other versions
EP0369655A3 (de
Inventor
Peter Constantine Chaconas
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.)
Black and Decker Inc
Original Assignee
Black and Decker Inc
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 Black and Decker Inc filed Critical Black and Decker Inc
Publication of EP0369655A2 publication Critical patent/EP0369655A2/de
Publication of EP0369655A3 publication Critical patent/EP0369655A3/de
Withdrawn legal-status Critical Current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

Definitions

  • the present invention relates to screwdriver bits and in particular to an improved screwdriver bit for Phillips-head fasteners that significantly reduces the "cam-out" experienced with a conventional screwdriver bit for Phillips-head fasteners.
  • the primary object of the present invention to provide an improved screwdriver bit that satisfies standard Phillips-head geometry and, therefore, is useable with standard Phillips-head fasteners and yet is designed to significantly reduce the tendency of the driver to cam-out of the recess in the screw head.
  • Figure 1 in the drawings illustrates a standard No. 2 Phillips bit 10 and will be used as a starting point for the description of the present invention.
  • a standard Phillips bit 10 has a cross-shaped tip that is formed through the creation of four wedge-shaped concave recesses that converge toward the tip 11 of the bit.
  • the recesses define four evenly spaced wings 12 that are tapered along their outer radial surfaces 14 toward the tip of the bit. The angle of this taper is referred to as the "wing angle" and in a standard No. 1, 2, or 3 Phillips bit is equal to 26 degrees 30 minutes relative to the vertical axis of the bit.
  • each recess The radially innermost part 16 of each recess is referred to as the "root” 16 and the angle at which the root diverges from the tip relative to the axis of the bit is referred to as the "root angle".
  • the root angle of that portion of the bit 10 adapted to engage the fastener is 5 degrees 45 minutes, as shown in Figure 3.
  • the root angle in a standard No. 3 Phillips bit is also 5 degrees 45 minutes; however, the root angle is 7 degrees in a standard No. 1 Phillips bit.
  • the angle formed by the adjoining interior wing surfaces 18, referred to as the "included angle" is 92 degrees in a standard No.
  • the resulting cam-out force, "Y" generated by the application of torque from the screwdriver bit 10 to the fastener 24 is equal to a factor of 0.43 (i.e., sin 26 o 30′) times the magnitude of the force vector "Z".
  • the greater the application of torque the greater the force tending to cam the screwdriver bit 10 out of the recess 20 in the head 22 of the fastener 24.
  • the improved Phillips-type screwdriver bit according to the present invention has been designed so that torque loading between the bit and the recess in the head of a standard Phillips fastener is confined to the side faces of the bit wings. This is accomplished in the manner described below.
  • an improved Phillips-type screwdriver bit 30 according to the present invention is shown. At the outset it is important to note that the present screwdriver bit 30 retains the same root angle (either 5 degrees 45 minutes for a No. 2 or No. 3 Phillips fastener, or 7 degrees for a No.
  • the width of the radially outward facing surface 34 of the bit wing 32 remains substantially constant from the base 31 of the wing to the wing tip 35.
  • This is contrary to the configuration of a standard Phillips bit, as illustrated in Figure 1, whose corresponding surface 14 gradually increases in width from the base 11 of the wing 12 to the wing tip 15 due to the geometry of the Phillips-standard root angle and the constant Phillips-standard included angle.
  • the improved Phillips-type bit 30 according to the present invention does not maintain a constant included angle from the base 31 of the wing 32 to the wing tip 35.
  • the included angle between the bit wings 32 in the present screwdriver bit 30 is equal to the Phillips-standard 92 degrees at the base 31 of the bit wings 32 and progressively increases to approximately 105 degrees at the wing tips 35.
  • the side surfaces of the bit wings 32 in the present bit 30 comprise generated surfaces.
  • the 103-degree angle referred to corresponds to the included angle at an axial position somewhat below the wing tip 35 as the entire bit portion typically does not fit into the recess 20 in the head of the fastener 24, as shown in Figure 27.
  • the radial dimension of the bit wings 32 when the bit is fully inserted into the recess 20 is less than that of the recess wings 21 so that a slight space is maintained between the radially outward facing surfaces 34 of the bit wings 32 and the opposing surfaces 44 of the recess wings 21.
  • the roots 36 of the recesses between adjoining bit wings 32 are also formed somewhat deeper so that an additional gap 40 (Figure 25) is created between the root 36 of the bit 30 and the root 42 of the recess 20 in the standard Phillips-head fastener 24.
  • the base 31 of the present screwdriver bit 30 is preferably truncated as shown to prevent the bit 30 from bottoming out when inserted into the recess 20 of a standard Phillips-head fastener 24.
  • these lines of contact 46 form substantially the same 5-degree 45-minute angle with respect to the axis of the bit 30 corresponding to the Phillips-standard root angle.
  • the lines of contact expand radially outwardly in parallel fashion along the side faces of the bit wings 32, as indicated by the shaded portion 50 illustrated in Figure 29. This serves to significantly increase the level of torque that can be transmitted from the screwdriver bit 30 to the fastener 24 while confining the areas of engagement to the side surfaces of the bit wings 12.
  • This distinction between the present invention and the standard Phillips bit is illustrated in Figures 14 and 26.
  • the vertical force component "Y" tending to cause the bit 30 to cam-out of the recess 20 is only equal to approximately a factor of 0.10 (i.e., sin 5 o 45′) times the magnitude of the force vector "Z". Accordingly, when compared to a standard Phillips bit 10, significantly less downward force is required from the operator to retain the present bit 30 in the recess 20 of a standard Phillips-head fastener 24, even at high levels of applied torque.
  • the screwdriver bit 30 is able to significantly reduce the cam-out force associated with a standard Phillips screwdriver bit 10 by preventing the radially outward facing bit wing surfaces 34 from contacting the recess 20 in the head 22 of the fastener 24. Due to the angle of these bit wing surfaces 34, the application of force along these surfaces is believed to be the greatest cause of cam-out in a standard Phillips design. Therefore, the present screwdriver bit 30 is capable of deforming the recess wings 21 in a Phillips-head fastener 24 to the degree illustrated in Figure 26 before significant cam-out forces will be generated. At the stage illustrated in Figure 26, torque is being applied along virtually the entire side surfaces of the bit wings 32 from the initial lines of contact 46 adjacent the root 36 of the bit to the outer radial edges 48 of the bit wings 32.
  • the present screwdriver bit 30 is capable of applying significantly greater torque loads than a standard Phillips bit in either rotational direction. Therefore, unlike certain existing modified Phillips designs which radially offset the bit wings and are, therefore, primarily useable in only one rotational direction, the present invention is equally useful for tightly setting standard Philips screws and for "breaking free” and removing "frozen” Phillips fasteners.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP89311411A 1988-11-14 1989-11-03 Schraubenzieherspitze für Schrauben mit Phillips-Kopf Withdrawn EP0369655A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US27000088A 1988-11-14 1988-11-14
US270000 1988-11-14

Related Child Applications (2)

Application Number Title Priority Date Filing Date
EP19930104130 Division EP0551930A3 (en) 1988-11-14 1989-11-03 Screwdriver bit for phillips-head fasteners
EP93104130.5 Division-Into 1989-11-03

Publications (2)

Publication Number Publication Date
EP0369655A2 true EP0369655A2 (de) 1990-05-23
EP0369655A3 EP0369655A3 (de) 1990-07-11

Family

ID=23029478

Family Applications (2)

Application Number Title Priority Date Filing Date
EP89311411A Withdrawn EP0369655A3 (de) 1988-11-14 1989-11-03 Schraubenzieherspitze für Schrauben mit Phillips-Kopf
EP19930104130 Withdrawn EP0551930A3 (en) 1988-11-14 1989-11-03 Screwdriver bit for phillips-head fasteners

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP19930104130 Withdrawn EP0551930A3 (en) 1988-11-14 1989-11-03 Screwdriver bit for phillips-head fasteners

Country Status (4)

Country Link
EP (2) EP0369655A3 (de)
JP (1) JPH0811368B2 (de)
AU (3) AU4458389A (de)
CA (1) CA2002162C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12016280B2 (en) 2022-08-02 2024-06-25 2by2 Industries, LLC Landscape timber system

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6223634B1 (en) * 1997-10-03 2001-05-01 Phillips Screw Company Recessed head fastener and driver systems
AUPQ432899A0 (en) 1999-11-29 1999-12-23 Fcd (Holdings) Pty Limited Rotatable drilling bit

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2046838A (en) * 1934-07-03 1936-07-07 Phillips Screw Co Screw driver
NL42923C (de) * 1934-07-03
US2474994A (en) * 1942-12-30 1949-07-05 American Screw Co Screw socket
US2389129A (en) * 1943-09-03 1945-11-20 Joseph H Bishop Universal screw driver
US2646829A (en) * 1948-07-13 1953-07-28 Res Eng & Mfg Driver for recessed head fasteners
US2601453A (en) * 1948-07-21 1952-06-24 Res Eng & Mfg Driving tool for socket head fasteners
US2764197A (en) * 1952-10-07 1956-09-25 North American Aviation Inc Driver for recessed head screws
FR1330358A (fr) * 1961-05-26 1963-06-21 Guest Perfectionnements aux éléments métalliques de fixation filetés et aux outils de pose pour ces éléments
US3234982A (en) * 1963-06-24 1966-02-15 Gardner Denver Co Driver for recessed head fasteners
GB1065348A (en) * 1965-04-26 1967-04-12 Stead & Company Ltd J Improvements in or relating to screwdrivers and their manufacture
US3654974A (en) * 1970-04-08 1972-04-11 Bertron Otis Barnes Screw drivers
US3658105A (en) * 1970-05-04 1972-04-25 John Burt Fastener driving arrangement
US3913647A (en) * 1974-05-28 1975-10-21 Edward T Arnn Screw driver
CA1066542A (en) * 1977-03-07 1979-11-20 Bernard F. Reiland Lobular socket head fastener with service slot
FR2469250A1 (fr) * 1979-11-12 1981-05-22 Defougeres Pierre Embout cruciforme pour outil de vissage
DE3174306D1 (en) * 1980-07-23 1986-05-15 Gkn Screws Fasteners Ltd Fastener and driver combination
US4625598A (en) * 1985-05-10 1986-12-02 Frank Wolfram Positive engagement screw driver tool

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12016280B2 (en) 2022-08-02 2024-06-25 2by2 Industries, LLC Landscape timber system

Also Published As

Publication number Publication date
AU4458389A (en) 1990-05-17
EP0551930A2 (de) 1993-07-21
CA2002162C (en) 1995-10-03
AU665621B2 (en) 1996-01-11
CA2002162A1 (en) 1990-05-14
JPH0811368B2 (ja) 1996-02-07
AU3535993A (en) 1993-05-20
EP0369655A3 (de) 1990-07-11
JPH02237773A (ja) 1990-09-20
EP0551930A3 (en) 1993-08-18
AU3772995A (en) 1996-01-11

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