EP0839611A1 - Maulschlüssel - Google Patents

Maulschlüssel Download PDF

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Publication number
EP0839611A1
EP0839611A1 EP97118772A EP97118772A EP0839611A1 EP 0839611 A1 EP0839611 A1 EP 0839611A1 EP 97118772 A EP97118772 A EP 97118772A EP 97118772 A EP97118772 A EP 97118772A EP 0839611 A1 EP0839611 A1 EP 0839611A1
Authority
EP
European Patent Office
Prior art keywords
side surfaces
open
curvature
wrench
wrench according
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.)
Ceased
Application number
EP97118772A
Other languages
German (de)
English (en)
French (fr)
Inventor
Hans Joachim Mehlau
Klaus Neuhaus
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.)
Stahlwille Eduard Wille GmbH and Co KG
Original Assignee
Eduard Wille 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 Eduard Wille GmbH and Co KG filed Critical Eduard Wille GmbH and Co KG
Publication of EP0839611A1 publication Critical patent/EP0839611A1/de
Ceased 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
    • B25B13/00—Spanners; Wrenches
    • B25B13/02—Spanners; Wrenches with rigid jaws
    • B25B13/08—Spanners; Wrenches with rigid jaws of open jaw type

Definitions

  • the invention relates to an open-end wrench.
  • These are tools for tightening or loosening screw connections, in which the tool is attached to a polygonal or polygonal part of the screw connection, e.g. the square or hexagonal head of a screw or a hexagonal nut.
  • the open-end wrench has a shaft and, at one end or both ends, a recess that is open to one side, the “open-ended mouth” of the open-end wrench. This mouth opening forms two opposite side surfaces, the distance between them, the "key width”, is slightly larger than the distance between diametrically opposite surfaces of the polygonal part.
  • the two side surfaces like the side surfaces of the polygonal part, are flat and parallel to one another. Due to the slight play between the side surfaces of the jaw opening and the opposite surfaces of the polygonal part, there is a slight tilting of the spanner relative to the screw head or the nut.
  • the side surfaces of the mouth opening then lie against the edges of the screw head or nut, on one side against the inner edge with respect to the mouth opening and on the opposite side against the outer edge. The torques for tightening or loosening the screws are transferred via the edges.
  • the invention relates to an open-end wrench that does not act on the edges but on the side surfaces of the polygonal part.
  • DE-PS 231 581 relates to an open-end wrench in which the contact surfaces of the jaws, that is to say the side surfaces of the jaw opening, are each formed by two flat surface parts which adjoin one another like a roof. The edges formed between the surface parts face each other. The respective outer surface part of each of the side surfaces lies at a distance corresponding to the width across flats from the respective inner surface part of the opposite side surface.
  • DE-PS 697 361 shows an open-end wrench with a jaw opening essentially adapted to the shape of a hexagon nut with flat surfaces, in which all corners form cylindrical recesses of the mouth opening. As a result, the spanner should only attack the nut outside the corners. Line contact of an edge causes a notch effect.
  • WO 93/10945 A1 and WO 94/23902 A1 show an open-end wrench, in which the side surfaces of the open-mouthed part initially have parallel, flat surface parts on the outer edges of the open-ended mouth. Subsequently, each of the side surfaces forms a depression, which is again followed by a convex-cylindrical section. The convex-cylindrical section then merges continuously into an arcuate mouth. The radii of curvature of the convex-cylindrical sections are equal to half the width of the wrench. The relatively small radius of curvature results in a large surface pressure.
  • DE-AS 1 088 437 shows an open-end wrench in which projections are formed in the jaw openings, which only act on the side surfaces of the nuts or screw heads.
  • the invention has for its object to provide a simple wrench that engages on the side surfaces of the part of the screw to be tightened or loosened (nut or screw head) so that the surface pressure between this part and the wrench is low, and convenient the nut or the screw head can be put on.
  • the corners of the The screw head or nut should not be damaged when tightening or loosening.
  • this object is achieved by a wrench in which the jaw opening is delimited by a pair of opposing, at least in inner sections with a finite radius of curvature slightly convexly curved side surfaces, which form a jaw opening that widens to the outer edges beyond the width across flats, a jaw base and with a smaller radius of curvature, concave-cylindrical curved connecting surfaces between the side surfaces and the jaw base.
  • Such an open-end wrench can be easily slid onto the nut or screw head with the widening opening.
  • the weakly convex-cylindrical curved side surfaces of the jaw opening lie against the side surfaces and not against the edges of the nut or the screw head.
  • the contact points are offset from one another in the direction of the axis of symmetry of the jaw opening.
  • a pair of forces therefore acts on the screw or nut.
  • the edges of the nut or the screw head lie in the area of the concave-cylindrical curved connection surfaces and are therefore not loaded.
  • the shape of such a wrench is very simple and, at first glance, hardly differs from that of a conventional wrench.
  • Embodiments of the invention are the subject of the dependent claims.
  • the combination wrench has a shaft 10 and a key head 12.
  • the outer contours 14 of the key head correspond to those of conventional open-ended spanners, such as those e.g. are shown in the "Stahlwille" catalog from Eduard Wille GmbH & Co.
  • the key head 12 forms a jaw opening 16. With the jaw opening 16, the combination wrench can be pushed onto a hexagonal screw head 18.
  • the jaw opening 16 has two opposite side surfaces 20 and 22 and a jaw base 24.
  • the Side surfaces are slightly curved with a finite radius of curvature.
  • the side surfaces 20 and 22 which are curved in this way extend as far as the outer edges 26 and 28 of the jaw opening 16. It is therefore not connected to the curved surfaces, as is the case in WO94 / 23902, for the flat surfaces which are still parallel.
  • the convex-cylindrical curved side surfaces 20 and 22 are connected to the base 24 of the mouth 24 by concavely cylindrical connecting surfaces 30 and 32 with a smaller radius of curvature.
  • the concave-cylindrical curved connection surfaces 30 and 32 are tangential to the side surfaces 20 and 22 and to the base 24 of the mouth.
  • the cross-section of the mouth 24 is essentially V-shaped with two essentially flat surface parts 34 and 36 adjoining the connecting surfaces 30 and 32.
  • the planes of the flat surface parts 34 and 36 enclose an obtuse angle of more than 120 °.
  • the angle between the planar surface parts 34 and 36 is preferably between 125 ° and 150 °. In the preferred exemplary embodiment shown, the angle between the flat surface parts is 130 °.
  • the flat surface parts 34 and 36 are connected to one another by a concave-cylindrical connecting surface 38.
  • the finite radius of curvature of the side surfaces 20 and 22 is larger than the wrench size but smaller than five times the wrench size.
  • the radius of curvature R of the side surfaces 20 and 22 corresponds approximately to 2.5 times the width across flats.
  • the radii of curvature of the concave-cylindrical connecting surfaces 30 and 32 between side surfaces 20 and 22 and the base 24 are in a range between 0.08 and 0.3 times the width across flats. In the preferred exemplary embodiment shown, the radii of curvature of the connecting surfaces are approximately 0.16 times the width across flats.
  • the shape of the spanner described is quite simple.
  • the jaw opening widens outwards so that the spanner can be easily pushed onto a screw head or nut.
  • the side surfaces 20 and 22 bear against the flat side surfaces of the screw head or the nut with a slight curvature.
  • the contact points 40 and 42 are offset from one another along the line of symmetry 44 of the jaw opening.
  • a torque is exerted on the spanner, a pair of forces acts about the axis 46 of the screw connection.
  • the surface pressures are low thanks to the relatively low curvature of the side surfaces 20 and 22.
  • the edges of the screw head or nut 18 are not loaded.
  • the described v-shaped design of the mouth bottom 24 with an angle slightly larger than 120 ° between the surfaces 34 and 36 has the advantage that with the same outer contour 14 of the key head 12 as in the previously known combination wrenches from the "Stahlwille" catalog in the jaws of the key head 12 more material is preserved than in a conventional arched mouth bottom.
  • the fact that the angle is greater than 120 ° on the other hand ensures that corners or the adjoining surfaces of the screw head or the nut do not touch the jaw bottom 24 or the radii 30 and 32 come to rest, which could lead to clamping and uncontrolled stresses.
  • the radii of curvature of the connecting surfaces 30, 32 and 38 are selected so that the material does not tear at these points even at high torques.
  • slightly curved convex-cylindrical surface parts 47 and 48 of the side surfaces 20 and 22 do not extend all the way to the outer edges 26 and 28 of the jaw opening 16. Rather, the inner, curved surface parts 47 are connected and 48 outer planar parts 50 and 52, respectively.
  • the flat surface parts 50 and 52 are tangent to the adjacent curved surface parts 47 and 48.
  • the weakly curved inner surface parts 47 and 48 and the adjoining flat surface parts 50 and 52 form, as in the embodiment according to FIG jaw opening 16 widening beyond the width across flats to the outer edges 26 and 28.
  • planar, outer surface parts 50 and 52 can, instead of being tangentially angled outwards, connect to the slightly curved inner surface parts, so that an obtuse-angled edge is formed between the inner and the outer surface parts.
  • Fig.4 Another version of the spanner is shown in Fig.4.
  • the slightly curved side surfaces 20 and 22 adjoin to the outside convex-cylindrical surface parts 54 and 56, the radius of curvature of which is considerably smaller than the radius of curvature of the side surfaces 20 and 22.
  • a widening opening is delimited by these surface parts 54 and 56, which leads the open-end wrench when the open-end wrench is placed on a nut or a screw head.
  • FIGS. 2 and 3 or FIG. 4 are constructed in the same way as the spanner of FIG. 1. Corresponding parts have the same reference numerals as there.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
  • Paper (AREA)
  • Media Introduction/Drainage Providing Device (AREA)
  • Endoscopes (AREA)
EP97118772A 1996-10-30 1997-10-29 Maulschlüssel Ceased EP0839611A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE29619599U 1996-10-30
DE29619599U DE29619599U1 (de) 1996-10-30 1996-10-30 Maulschlüssel

Publications (1)

Publication Number Publication Date
EP0839611A1 true EP0839611A1 (de) 1998-05-06

Family

ID=8031787

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97118772A Ceased EP0839611A1 (de) 1996-10-30 1997-10-29 Maulschlüssel

Country Status (6)

Country Link
US (1) US5992271A (zh)
EP (1) EP0839611A1 (zh)
JP (1) JPH10138156A (zh)
CN (1) CN1070101C (zh)
DE (1) DE29619599U1 (zh)
TW (1) TW347357B (zh)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3292957A1 (de) * 2016-04-15 2018-03-14 Wera - Werk Hermann Werner GmbH & Co. KG Schraubwerkzeug mit beweglicher backe
TWI794135B (zh) * 2022-11-16 2023-02-21 潤丞有限公司 多規格開口板手

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030145690A1 (en) * 2002-02-01 2003-08-07 Hartman Jerry A. Tool for engaging and rotating a threaded fastener without damaging a surface finish or points of the fastener
WO2009157745A1 (es) * 2008-05-23 2009-12-30 Godinez Torres Jose Adalberto Mejoras de llave española con tres puntos de contacto
TWM434649U (en) * 2012-02-23 2012-08-01 Kabo Tool Co Structure for wrench clamp
CN102615613A (zh) * 2012-04-01 2012-08-01 陈伟 一种快速开口扳手
TWI660818B (zh) * 2018-06-26 2019-06-01 鴻安國際興業有限公司 可快轉之工具
US11135702B2 (en) 2018-07-30 2021-10-05 Hong Ann Tool Industries Co., Ltd. Tool adapted to be driven rapidly

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR770360A (fr) * 1933-06-10 1934-09-13 Dispositif d'accouplement angulaire entre deux organes mécaniques pour toutes applications, mais plus spécialement applicable aux outils de serrage
DE808697C (de) * 1950-04-25 1951-07-19 Ruhrhandel G M B H Schraubenschluessel, insbesondere fuer den Eisenbahnoberbau
US3242775A (en) * 1965-08-11 1966-03-29 Walter F Hinkle Wrench for engaging nut flats to inhibit marring the nut
FR2143814A1 (zh) * 1971-06-28 1973-02-09 Specialty Tools
US3785226A (en) * 1972-05-18 1974-01-15 J Ward Locking wrench
US3921476A (en) * 1973-11-23 1975-11-25 James P Evans Combination torqueing and ratcheting wrench for irregular hexagonal members
WO1994023902A1 (en) * 1993-04-22 1994-10-27 STANLEY-PROTO INDUSTRIAL TOOLS a division of MECHANICS TOOLS, INC. Improved open end wrench
US5396820A (en) * 1993-01-15 1995-03-14 Baker; David R. Open end wrench with removable handle

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US540868A (en) * 1895-06-11 Water-heater for gas or gasoline stoves
US4765211A (en) * 1985-09-18 1988-08-23 Colvin David S Wrench opening
US5239899A (en) * 1991-02-15 1993-08-31 Baker David R Wrench with inclined drive faces
DE19634209A1 (de) * 1996-08-25 1998-02-26 Hsieh Chih Ching Maulschlüssel mit überhöhtem Basisbereich

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR770360A (fr) * 1933-06-10 1934-09-13 Dispositif d'accouplement angulaire entre deux organes mécaniques pour toutes applications, mais plus spécialement applicable aux outils de serrage
DE808697C (de) * 1950-04-25 1951-07-19 Ruhrhandel G M B H Schraubenschluessel, insbesondere fuer den Eisenbahnoberbau
US3242775A (en) * 1965-08-11 1966-03-29 Walter F Hinkle Wrench for engaging nut flats to inhibit marring the nut
FR2143814A1 (zh) * 1971-06-28 1973-02-09 Specialty Tools
US3785226A (en) * 1972-05-18 1974-01-15 J Ward Locking wrench
US3921476A (en) * 1973-11-23 1975-11-25 James P Evans Combination torqueing and ratcheting wrench for irregular hexagonal members
US5396820A (en) * 1993-01-15 1995-03-14 Baker; David R. Open end wrench with removable handle
WO1994023902A1 (en) * 1993-04-22 1994-10-27 STANLEY-PROTO INDUSTRIAL TOOLS a division of MECHANICS TOOLS, INC. Improved open end wrench

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3292957A1 (de) * 2016-04-15 2018-03-14 Wera - Werk Hermann Werner GmbH & Co. KG Schraubwerkzeug mit beweglicher backe
TWI794135B (zh) * 2022-11-16 2023-02-21 潤丞有限公司 多規格開口板手

Also Published As

Publication number Publication date
TW347357B (en) 1998-12-11
CN1070101C (zh) 2001-08-29
CN1184729A (zh) 1998-06-17
JPH10138156A (ja) 1998-05-26
US5992271A (en) 1999-11-30
DE29619599U1 (de) 1997-07-03

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