EP0442511A2 - Clef à six pans mâle - Google Patents

Clef à six pans mâle Download PDF

Info

Publication number
EP0442511A2
EP0442511A2 EP91102124A EP91102124A EP0442511A2 EP 0442511 A2 EP0442511 A2 EP 0442511A2 EP 91102124 A EP91102124 A EP 91102124A EP 91102124 A EP91102124 A EP 91102124A EP 0442511 A2 EP0442511 A2 EP 0442511A2
Authority
EP
European Patent Office
Prior art keywords
key
working end
screw
hexagonal
distance
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Withdrawn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
EP91102124A
Other languages
German (de)
English (en)
Other versions
EP0442511A3 (en
Inventor
Klaus Amtenbrink
Gerd Erlenkeuser
Jürgen Grossjean
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.)
Wera Werk Hermann Werner GmbH and Co KG
Original Assignee
Wera Werk Hermann Werner GmbH and Co KG
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 Wera Werk Hermann Werner GmbH and Co KG filed Critical Wera Werk Hermann Werner GmbH and Co KG
Publication of EP0442511A2 publication Critical patent/EP0442511A2/fr
Publication of EP0442511A3 publication Critical patent/EP0442511A3/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Withdrawn legal-status Critical Current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
    • B25B15/008—Allen-type keys

Definitions

  • the invention relates to an inner socket hex key according to the preamble of the main claim.
  • Hexagon socket wrenches of this type have been known for a long time.
  • the hexagonal working end of the key should be brought into positive engagement with corresponding recesses of hexagon socket head screw heads. Due to manufacturing tolerances, the internal dimensions of the hexagonal recesses of the screw heads are slightly larger than the external dimensions of the hexagonal working end of the key. Because of these conditions, an exact form fit cannot be achieved.
  • the side surfaces of a recess in a screw head are only covered by edges of the key hexagon.
  • this is disadvantageous because the linear surfaces of the recesses are permanently deformed by this linear load.
  • the recesses of hexagon socket screws with a small standard size are quickly turned round after repeated use, since the attacking edges of the working end penetrate into the screw head material.
  • the object of the invention is to provide a generic inner socket wrench in which these disadvantages are avoided.
  • the radius of curvature of the spherical surface in the circumferential direction corresponds approximately to five times the distance between two opposing surfaces of the key insertion head.
  • An advantageous development of the key provides that its cross section tapers towards the free end of the working end. It is hereby achieved that the distance between two opposite surfaces is at a distance from the end of the working end that exceeds the standard dimension.
  • the conicity angle, the angle between the side surface and the key axis, is preferably 1.5 °.
  • Such a configuration of the hexagon socket wrench allows the key to be inserted into the screw head to a depth at which the surface distance at the working end corresponds to the inner surface distance on the surface of the screw head. In this position, a form fit is almost achieved on the upper edge.
  • the material of the screw head is elastically deformed, so that the initially point-shaped contact point between a conical-spherical side surface of the key and the flat inner surface of the screw head spreads out flat because of the elastic deformability of the material, whereby the contact surface increases with increasing pressure.
  • the conical-spherical design of the working end of the key has the particular advantage that even with already deformed screw heads whose recesses no longer have an exact hexagonal layout, it still leads to a full stop surface.
  • Another advantage that results from the conical design is the clamp connection between screw and wrench. This enables a screw to be screwed into a difficult-to-access thread to be first plugged onto the key, the screw being secured against falling off by the clamping positive connection. The screw can then be screwed tightly into the thread on the key.
  • the reference numeral 1 denotes an inner socket wrench according to the invention, which has a handle 2, to which a shaft 3 connects, to which a hexagonal working end 4 is formed.
  • the edges 6 of the working end 4 extend at an acute angle to the axis of the key 1, which corresponds to the axis of the cylindrical shaft 3.
  • the distance between two opposite surfaces 6 of the plug-in head 4 is less than the distance between two opposite inner surfaces 10 of the hexagon recess 9 of a screw head 8 of a screw 7.
  • the surfaces 6 of the working end 4 are spherical, with the radius of curvature the surfaces 6 corresponds approximately to five times the distance between two opposing surfaces 6.
  • the surfaces 6 correspond to the circumferential surfaces of a cylinder whose radius is the radius of curvature and whose axis is inclined by the angle of the taper to the key axis.
  • the crowning has the same radius of curvature in every cross section, in spite of the conicity of about 1.5 ° here.
  • the working end 4 inserted into the recess 9 of a screw head 8 is acted upon in a clockwise direction by a torque.
  • the torque is not transmitted via a point of contact of the edge 5 with the surface 10, but rather via a surface of contact of the width b of the surfaces 6 and 10.
  • the width of the surface b is greater, the greater the torque applied.
  • FIG. 3 shows the conical working end 4, with the surfaces 6 being delimited by edges 5 tapering towards one another.
  • the mutually parallel surfaces 10 of an insertion opening 9 are spaced slightly larger than the standard dimension.
  • a hexagon socket wrench designed in this way can then be inserted with its screw insertion head 4 into the insertion opening 9 until the distance between two opposite surfaces 6 on the screw surface 12 corresponds exactly to the distance between two opposite surfaces 10.
  • the upper edges of the surfaces 10 enclose the working end almost in a form-fitting manner.
  • a further action on the screw insertion head in the axial direction causes the surfaces 6 of the working end 4 to jam with the inner surfaces 10 of the insertion opening 9.
  • a screw 7 is secured against falling on the key 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
EP19910102124 1990-02-14 1991-02-14 Allen-key Withdrawn EP0442511A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9001707U DE9001707U1 (de) 1990-02-14 1990-02-14 Innenbuchsensechskantschlüssel
DE9001707U 1990-02-14

Publications (2)

Publication Number Publication Date
EP0442511A2 true EP0442511A2 (fr) 1991-08-21
EP0442511A3 EP0442511A3 (en) 1992-04-15

Family

ID=6850998

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910102124 Withdrawn EP0442511A3 (en) 1990-02-14 1991-02-14 Allen-key

Country Status (2)

Country Link
EP (1) EP0442511A3 (fr)
DE (1) DE9001707U1 (fr)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512248A1 (fr) * 1991-05-02 1992-11-11 WERA WERK HERMANN WERNER GmbH & CO. Outil pour visser, notamment tournevis
DE9209107U1 (de) * 1992-07-07 1992-11-12 Aoyama Seisakusho Co., Ltd., Nagoya, Aichi Schraubbolzen und steckschluessel
WO2002026448A2 (fr) * 2000-09-27 2002-04-04 Snap-On Technologies, Inc. Douille de retenue a geometrie variable
FR2916820A3 (fr) * 2007-06-01 2008-12-05 Memometal Technologies Soc Par Dispositif d'actionnement d'une vis.
USD888526S1 (en) 2018-09-04 2020-06-30 Snap-On Incorporated Hex driver
US10960520B2 (en) 2018-09-04 2021-03-30 Snap-On Incorporated Hex driver

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017193022A (ja) * 2016-04-21 2017-10-26 三菱重工業株式会社 キーレンチ

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658105A (en) * 1970-05-04 1972-04-25 John Burt Fastener driving arrangement
FR2383350A1 (fr) * 1977-03-07 1978-10-06 Textron Inc Element de fixation a tete creuse
GB2048738A (en) * 1979-05-10 1980-12-17 Textron Inc Fastener and driver assembly
DE3120216A1 (de) * 1981-05-21 1982-12-09 Fa. Fedor Ulisch, 5630 Remscheid "stufensteckschluessel"
US4503737A (en) * 1983-04-11 1985-03-12 Digiovanni Donald Threaded fastener removing tool
US4625598A (en) * 1985-05-10 1986-12-02 Frank Wolfram Positive engagement screw driver tool
DE3644449A1 (de) * 1986-12-24 1988-07-07 Werner Hermann Wera Werke Schraubendreher

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3206494A1 (de) * 1982-02-24 1983-09-08 Rappold, Manfred, Dr., 7117 Bretzfeld Kopf- und schluesselausbildung fuer eine schraube

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658105A (en) * 1970-05-04 1972-04-25 John Burt Fastener driving arrangement
FR2383350A1 (fr) * 1977-03-07 1978-10-06 Textron Inc Element de fixation a tete creuse
GB2048738A (en) * 1979-05-10 1980-12-17 Textron Inc Fastener and driver assembly
DE3120216A1 (de) * 1981-05-21 1982-12-09 Fa. Fedor Ulisch, 5630 Remscheid "stufensteckschluessel"
US4503737A (en) * 1983-04-11 1985-03-12 Digiovanni Donald Threaded fastener removing tool
US4625598A (en) * 1985-05-10 1986-12-02 Frank Wolfram Positive engagement screw driver tool
DE3644449A1 (de) * 1986-12-24 1988-07-07 Werner Hermann Wera Werke Schraubendreher

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0512248A1 (fr) * 1991-05-02 1992-11-11 WERA WERK HERMANN WERNER GmbH & CO. Outil pour visser, notamment tournevis
US5284075A (en) * 1991-05-02 1994-02-08 Wera Werk Hermann Werner Gmbh & Co. Screwing tool, particularly a screwdriver
DE9209107U1 (de) * 1992-07-07 1992-11-12 Aoyama Seisakusho Co., Ltd., Nagoya, Aichi Schraubbolzen und steckschluessel
WO2002026448A2 (fr) * 2000-09-27 2002-04-04 Snap-On Technologies, Inc. Douille de retenue a geometrie variable
WO2002026448A3 (fr) * 2000-09-27 2002-06-27 Snap On Tech Inc Douille de retenue a geometrie variable
US6626067B1 (en) 2000-09-27 2003-09-30 Snap-On Technologies, Inc. Retention socket geometry variations
FR2916820A3 (fr) * 2007-06-01 2008-12-05 Memometal Technologies Soc Par Dispositif d'actionnement d'une vis.
USD888526S1 (en) 2018-09-04 2020-06-30 Snap-On Incorporated Hex driver
US10960520B2 (en) 2018-09-04 2021-03-30 Snap-On Incorporated Hex driver

Also Published As

Publication number Publication date
EP0442511A3 (en) 1992-04-15
DE9001707U1 (de) 1991-06-13

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