EP1140431A1 - Mandrin de serrage destine a des composants d'outil - Google Patents

Mandrin de serrage destine a des composants d'outil

Info

Publication number
EP1140431A1
EP1140431A1 EP99968296A EP99968296A EP1140431A1 EP 1140431 A1 EP1140431 A1 EP 1140431A1 EP 99968296 A EP99968296 A EP 99968296A EP 99968296 A EP99968296 A EP 99968296A EP 1140431 A1 EP1140431 A1 EP 1140431A1
Authority
EP
European Patent Office
Prior art keywords
shaft
chuck
inner sleeve
spring
shank
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Withdrawn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
EP99968296A
Other languages
German (de)
English (en)
Inventor
Martin Holland-Letz
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.)
Felo Werkzeugfabrik Holland Letz GmbH
Original Assignee
Felo Werkzeugfabrik Holland Letz GmbH
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
Priority claimed from DE19923006A external-priority patent/DE19923006C2/de
Application filed by Felo Werkzeugfabrik Holland Letz GmbH filed Critical Felo Werkzeugfabrik Holland Letz GmbH
Publication of EP1140431A1 publication Critical patent/EP1140431A1/fr
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/0007—Connections or joints between tool parts
    • B25B23/0035—Connection means between socket or screwdriver bit and tool

Definitions

  • the invention relates to a chuck for a non-circular, preferably polygonal shaft of a tool insert, in particular screwdriver bits, according to the type specified in the preamble of claim 1.
  • Chuck for interchangeable tool inserts e.g. Screwdriver bits with hexagonal shank
  • Screwdriver bits with hexagonal shank in known designs are essentially constructed according to three principles.
  • the chuck consists of an inner sleeve with an internal hexagon profile, which corresponds to the hexagonal profile of the shank of the tool insert and transmits the torque from the drive shaft of the chuck to the tool insert.
  • At least one ball as a clamping element is mounted in the wall of the inner sleeve so as to be radially movable in a bore or slot.
  • An outer sleeve which is axially displaced by a spring force, grips over the ball, the ball being clamped between the mostly conical inner wall of the outer sleeve and a retaining notch in the hexagonal shaft of the tool insert or its surface.
  • the outer sleeve To insert the tool insert, the outer sleeve must be moved against the axially acting spring force so that the ball can be moved radially outwards and the hexagonal shaft can be inserted into the inner sleeve of the chuck. The same procedure must be followed to release the tension.
  • Chucks according to this functional principle are described in DE 29 34 428 AI and DE 38 29 331 C2.
  • the disadvantage is that with some chucks the outer sleeve has to be displaced in the direction of the working tip of the tool insert. This can cause the chuck to be pulled out of the cradle in the prime mover.
  • Another disadvantage is that the radial mobility and thus the clamping action of the ball can easily be disturbed by dirt particles that have penetrated into the chuck.
  • the fixation of the tool insert is effected in such a way that an outer sleeve is rotatably mounted on the inner sleeve of the chuck and a locking plate is firmly connected to the outer sleeve.
  • the locking plate has a circular opening with six prism-shaped recesses.
  • a spring washer is inserted in the inner sleeve of the chuck, which has spring tongues which run radially inwards and which are slightly oblique in the direction of insertion of the insert, the imaginary connection of the tips of the spring tongues forming a circle, the diameter of which is approximately the tangent circle corresponds to the hexagonal surface of the shank of the tool insert.
  • the outer sleeve is rotatable and axially slidably fixed on the inner sleeve. It has a bore corresponding to the outer circle of the profile of the hexagonal shank of the tool insert, the end wall on its inner surface has an annular extension projecting into the insertion opening of the inner sleeve.
  • the tool insert can be inserted into the chuck with slight axial force and rotary movement without actuation of the outer sleeve, the rotary movement being necessary because no demonstration for the Hexagonal profile of the shaft is given to the same inner profile of the inner sleeve.
  • the tips of the spring tongues snap into the locking grooves of the hexagonal shaft or in front of a shoulder and thus hold the insert.
  • To remove the outer sleeve is moved in the direction away from the insertion opening.
  • the ring-shaped shoulder on the inside of the end wall presses on the spring tongues and moves them outwards, so that the locking engagement in the locking grooves or in front of the shoulder is canceled.
  • the insert can now be removed from the chuck.
  • the disadvantage is that here too a relative rotation of the two sleeves is required and that it can happen because of the play between the inner sleeve and the outer sleeve that the spring tongues spread out very evenly and therefore the removal is inhibited.
  • the task is to improve the design of the chuck designed according to the third principle so that the rotational movement when inserting the tool insert is not required. This object is achieved by the characterizing features of claim 1.
  • the invention has the advantage that the tool insert is largely automatically pushed out of the chuck by the ejection spring after the locking connection has been released. In addition, a rotary movement is not required to establish or to release the latching connection.
  • Figure 1 shows a first embodiment of the chuck according to the invention in longitudinal section.
  • FIG. 2a and 2b are plan views of two spring washers suitable for the chuck according to FIG. 1;
  • FIG. 3 shows the bottom view of an outer sleeve of the chuck according to FIG. 1;
  • Figures 4 and 5 the chuck in Figure 1 corresponding views, but with an inserted tool insert and in a holding or partially extended position.
  • FIG. 6 shows a view corresponding to FIG. 1 of a second embodiment of the chuck according to the invention.
  • a drive element 1 of the chuck designed as a shaft is in one end of a e.g. made of steel attached inner sleeve 2, the other end is designed as an insertion opening 3 for a conventional shaft 4 (Fig. 4.5) of a tool insert 5, in particular a screwdriver bit.
  • a spring washer 6 is also attached, which is provided with radially inwardly projecting, flexible spring tongues 7 and 8 (FIGS. 2a, 2b), the ends of which when the shaft 4 is inserted into its locking grooves or locking notches 9 or Snap behind a corresponding shoulder and hold the tool insert in the chuck.
  • an outer sleeve 10 which is not rotatable relative to it, but is axially displaceable and expediently also made of steel.
  • this is provided with an inwardly projecting pin 12 which projects into an axially parallel longitudinal groove 11 or an axially parallel elongated hole of the inner sleeve 2.
  • the outer sleeve 10 has an end wall 14 with an opening 15 for the shaft 4, from which projects an annular extension 16 which faces the insertion opening 3 of the inner sleeve 2.
  • the opening 15 and the annular extension 16 have an inner contour that adapted to the cross-sectional profile of the shaft 4 and aligned flush with the inner contour of the insertion opening 3.
  • the shaft 4 is guided during insertion into the insertion opening 3 both by this and by the opening 15 lying in front of it or the extension 16 in such a way that there is positive locking in the direction of rotation. It is therefore possible to insert the shaft 4 with one hand, without any rotational movement, into the chuck or to pull it out again.
  • the shaft 4 or its end to be inserted into the insertion opening 3 generally have a hexagonal profile, but other profiles are also possible.
  • the outer contour of the extension 16 is preferably also designed in accordance with the cross-sectional profile of the shaft 4, in order thereby to make the spring tongues 7 and 8 corresponding to the outer contour of the shaft 4 when the latching connection is released spreading away.
  • a e.g. designed as a coil spring ejector spring 17 is used. This is supported at one end on a bottom 18 inserted into the inner sleeve 2, which can also be formed by the drive element 1, while its free end projects into the insertion opening 3 in such a way that it is axially tensioned by the shaft 4 when it is inserted and also remains tensioned in the locked position of the spring tongues 7, 8 by being compressed between the shaft 4 and the base 18.
  • the ejection spring 17 can relax and at least partially push the shaft 4 out of the insertion opening 3, so that the tool insert 5 may need to be pulled out a little bit from the chuck.
  • an annular, radially elastic inhibiting element 19 e.g. an O-ring. Its inner diameter is such that it is slightly smaller than the outer circle diameter of the profile of the tool insert shank 4.
  • a permanent magnet in the form of a ring magnet 20 on the bottom 18 of the inner sleeve 2, as is customary for simple magnet holders for tool inserts.
  • the magnetic field of the Magnet is passed through the tool insert 5 and continues in the countersunk screws or the like, which are placed on the working tip of the insert 5.
  • the ring magnet 20 is expediently penetrated by the ejection spring 17 and at the same time serves as a stop for the shaft end of the insert 5 in the locked position of the spring tongues 7 and 8
  • the force of the ejection spring 17 must be such that it can overcome the holding force of the ring magnet 20 when the latching connection is released.
  • the spring washer 6 can be of any design and can be attached to the end of the inner sleeve 2 forming the insertion opening 3. In a variant of the
  • Spring washer 6 corresponds to the connecting line of the spring tongue ends to the cross-sectional profile of the shank 4 of the tool insert 5 (FIG. 2b), as a result of which the engagement over the circumference of the shank 4 becomes more uniform and the release from the engagement position becomes safer.
  • the intermediate piece 21 essentially has an outer contour corresponding to the inner contour of the insertion opening 3a and has a certain undersize, so that it is easy to move axially.
  • the upper side of the intermediate piece 21 facing away from the bottom 18a is designed as a stop surface 22 (FIG. 6) for the shank 4a of the tool insert 5a.
  • means are provided which limit the axial displaceability of the intermediate piece 21 on both sides.
  • these means contain a groove 23, which is attached to the outer circumference of the intermediate piece 21 and is parallel to the longitudinal axis and closed at both ends, into which a stop pin 24 fastened to the inner sleeve 2a and projecting radially inward ends.
  • the length of the axial groove 23 thus determines the axial displacement path of the intermediate piece 21.
  • the stop pin 24, similar to the pin 12 according to FIGS. 1 to 5, can prevent the outer sleeve 10a from rotating on the inner sleeve 2a and, for this purpose, radially outward in a direction relative to the longitudinal axis parallel elongated hole 25 of the outer sleeve 10a closed at both ends protrude.
  • the intermediate piece 21 preferably has a recess machined from the stop surface 22, into which a bar magnet 26 is inserted, which has the same function as the ring magnet 20 according to FIGS. 1 to 5 and is preferably flush with the stop surface 22.
  • the embodiment according to FIGS. 6 to 8 has the particular advantage that the axial forces acting on the insert 5 when working are at least partially caused by the intermediate piece 21, which is made of any suitable material, i. not only have to be picked up by the magnet 26, which mostly consists of a brittle magnetic material that can be destroyed under certain circumstances by axial forces acting in a shock-like manner.
  • the ejection spring 17a does not have to work against the force of the magnet 26, contrary to FIGS. 1 to 5, if such is desired, since it moves the intermediate piece 21 together with the bar magnet 26 into a removal position for the tool insert 5a (FIG. 8).
  • the bar magnet 26 is designed such that the tool insert 5a can be easily removed from the bar magnet 26 in the removal position.
  • the strength of the ejection spring 17 can be selected independently of the magnetic force.
  • the inhibiting element 19 can also be omitted if necessary, because in this case the tool insert 5a is still held by the bar magnet 26 in the removal position.
  • the invention is not limited to the exemplary embodiments described, which can be modified in many ways. This applies in particular to the illustrated cross sections of the various parts, the design and arrangement of the ejection springs 17 and 17a, the anti-rotation elements between the two sleeves 2, 2a and 10 or 10a, the magnets 20, 26 and the intermediate piece 21 that the different parts can also be used in combinations other than those shown and described.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Gripping On Spindles (AREA)

Abstract

L'invention concerne un mandrin de serrage destiné à une tige (4) de section non circulaire, de préférence, polygonale d'une plaquette (5), notamment d'un embout de tournevis. Le mandrin contient une douille interne (2) qui présente à une extrémité un orifice d'insertion (3) destiné à insérer la tige (4) et doté d'un contour interne adapté au profil de la section de la tige (4) et un ressort plat (6) qui est doté de dents élastiques orientées radialement vers l'intérieur et destinées à l'encliquetage de la tige insérée (4). En outre, le mandrin présente une douille externe (10) pouvant se déplacer axialement sur la douille interne (2). Cette douille externe (10) contient une paroi frontale (14) dotée d'un orifice (15) destiné à la tige (4) et un appendice (16) annulaire tourné vers l'orifice d'insertion (3). Cet appendice sert à écarter les dents élastiques lors du déplacement axial de la douille externe (10). Selon l'invention, la douille externe (10) est placée bloquée en rotation sur la douille interne (2). L'orifice (15) et l'appendice annulaire (16) ont un contour interne qui est adapté au profil de la section de la tige (4) et affleure le contour interne de la douille interne (2). En outre, la douille interne (2) abrite un ressort d'éjection (17) qui est tendu lors de l'insertion de la tige (4) et qui expulse cette dernière au moins partiellement de l'orifice d'insertion (3) lors de l'écartement des dents élastiques (7).
EP99968296A 1998-12-19 1999-12-17 Mandrin de serrage destine a des composants d'outil Withdrawn EP1140431A1 (fr)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
DE19858875 1998-12-19
DE19858875 1998-12-19
DE19923006A DE19923006C2 (de) 1998-12-19 1999-05-14 Spannfutter für auswechselbare Werkzeugeinsätze
DE19923006 1999-05-14
PCT/DE1999/004022 WO2000037220A1 (fr) 1998-12-19 1999-12-17 Mandrin de serrage destine a des plaquettes amovibles

Publications (1)

Publication Number Publication Date
EP1140431A1 true EP1140431A1 (fr) 2001-10-10

Family

ID=26050882

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99968296A Withdrawn EP1140431A1 (fr) 1998-12-19 1999-12-17 Mandrin de serrage destine a des composants d'outil

Country Status (2)

Country Link
EP (1) EP1140431A1 (fr)
WO (1) WO2000037220A1 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5073321B2 (ja) 2007-03-07 2012-11-14 株式会社マキタ 回転工具のビット取り付け装置
DE202007010699U1 (de) 2007-08-01 2007-10-04 Robert Bosch Gmbh Handwerkzeugmaschine
DE102007058522A1 (de) * 2007-12-05 2009-06-10 Robert Bosch Gmbh Haltevorrichtung für Bits
US9120214B2 (en) 2010-01-13 2015-09-01 National Nail Corp. Fastener, installation tool and related method of use
US9802300B2 (en) 2010-01-13 2017-10-31 National Nail Corp. Fastener, installation tool and related method of use
US9144896B2 (en) 2010-01-13 2015-09-29 National Nail Corp. Fastener, installation tool and related method of use
TWI554367B (zh) * 2015-12-18 2016-10-21 陳河田 具快脫反轉結構之起子頭接桿

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9014997U1 (fr) * 1990-10-31 1992-03-19 Willi Hahn Gmbh & Co Kg, 7745 Schonach, De
DE4207337C1 (fr) * 1992-03-07 1993-06-09 Helfer & Co Kg, 3260 Rinteln, De
DE9403686U1 (de) * 1994-03-04 1994-06-09 Schroeder Robert Fa Einsteckhalterung für Werkzeugeinsätze, insbesondere Schraubendreherbits
US5722805A (en) * 1995-12-08 1998-03-03 Giffin; Brian K. Drill bit adaptor tool
DE19610213C2 (de) * 1996-03-15 1998-11-19 Schmidt Ulrich Ush Schraubwerk Spannfutter mit Bogenstück
DE19707839A1 (de) * 1997-02-27 1998-09-03 Werner Hermann Wera Werke Griff für Einsteckwerkzeuge

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO0037220A1 *

Also Published As

Publication number Publication date
WO2000037220A1 (fr) 2000-06-29

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