EP2754534A2 - Tige de torsion - Google Patents

Tige de torsion Download PDF

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Publication number
EP2754534A2
EP2754534A2 EP14150260.9A EP14150260A EP2754534A2 EP 2754534 A2 EP2754534 A2 EP 2754534A2 EP 14150260 A EP14150260 A EP 14150260A EP 2754534 A2 EP2754534 A2 EP 2754534A2
Authority
EP
European Patent Office
Prior art keywords
shaft
torsion
region
torsion bar
bar 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.)
Withdrawn
Application number
EP14150260.9A
Other languages
German (de)
English (en)
Other versions
EP2754534A3 (fr
Inventor
Herbert Ginter
Matthias Wissling
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.)
Hilti AG
Original Assignee
Hilti AG
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 Hilti AG filed Critical Hilti AG
Publication of EP2754534A2 publication Critical patent/EP2754534A2/fr
Publication of EP2754534A3 publication Critical patent/EP2754534A3/fr
Withdrawn legal-status Critical Current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
    • B25B23/00—Details of, or accessories for, spanners, wrenches, screwdrivers
    • B25B23/14—Arrangement of torque limiters or torque indicators in wrenches or screwdrivers
    • 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
    • B25B23/0021—Prolongations interposed between handle and tool

Definitions

  • the invention relates to a torsion bar for limiting torque according to the preamble of claim 1.
  • a torsion bar is formed with a shaft having a first end portion and a longitudinally opposite second end portion, a first coupling for non-rotatably connecting the shaft with the output spindle of a striking screwdriver, wherein the first coupling is arranged on the first end region of the shaft, and a second coupling for non-rotatably connecting the shaft with a threaded element, in particular with the nut of an expansion anchor, wherein the second coupling is arranged on the second end portion of the shaft, wherein the shaft between the first end portion and the second end region has a torsion region.
  • a generic Torsionsstab is for example from the GB1521461A known. It forms a torsion spring between the output spindle of the impact wrench and the tightening screw, which can limit the torque applied to the screw.
  • Another torsion bar is in the patent application DE102012213432A described
  • the object of the invention is to provide a particularly reliable and at the same time particularly cost-effective torsion bar available.
  • a torsion bar according to the invention is characterized in that the shaft in the torsion region is tubular with an internal cavity, and that the shaft has at least one slot in the torsion region.
  • the invention is based on the recognition that the use of a massive torsion range may be associated with disadvantages. Because in a torsion bar With a massive torsion range, relatively high shear stresses can occur (in a typical application up to approx. 900 N / mm 2 ). Therefore, in a massive torsion usually a high-strength tool steel and a relatively complex manufacturing process, sometimes with shot peening, are used to avoid premature failure of the torsion bar by fractures and to achieve sufficient service life.
  • the inventive use of an open pipe profile also creates additional degrees of freedom in the design of the torsion bar, because it can not only the diameter, but also the thickness of the slotted pipe can be varied here. Furthermore, The length of the torsion region can also be varied particularly easily and favorably in terms of manufacturing technology, since no machining of solid material is required. Finally, the image of a particularly robust torsion bar is mediated by the comparatively large outside diameter of the torsion area. As a result, further handling advantages are given.
  • the direction of the longitudinal axis of the torsion bar, in particular of its shaft can be understood as meaning the longitudinal direction.
  • the threaded element may have an external thread or an internal thread and it may be, for example, a screw or a nut.
  • the threaded element may be the nut of an expansion anchor.
  • Such an expansion anchor may comprise an anchor bolt and an expansion sleeve, wherein the anchor bolt is formed on the one hand with an expansion cone for spreading the expansion sleeve and on the other hand with a thread on which the nut is arranged.
  • the thread of the threaded element is preferably coaxial with the torsion bar when the torsion bar is used as intended.
  • the slot extends from the shaft outer side into the cavity of the shaft.
  • the shaft has exactly one slot in the torsion region. This can be advantageous, inter alia, with regard to the manufacturing outlay, since, according to this embodiment, the torsion region of the shank can be produced by simply bending / rolling a sheet-metal strip.
  • the shaft in at least one of the end regions, preferably in both end regions, and / or in the region of at least one of the clutches, preferably in the region of both clutches, a higher torsional stiffness to torsion about the longitudinal axis of the shaft than in the torsion region, in particular one at least the factor 2, preferably at least 5, 10 or 100 higher torsional stiffness.
  • a higher torsional stiffness to torsion about the longitudinal axis of the shaft than in the torsion region in particular one at least the factor 2, preferably at least 5, 10 or 100 higher torsional stiffness.
  • the product of the polar moment of inertia and the shear modulus can be understood as torsional rigidity.
  • the slot has a directional component in the direction of the longitudinal axis of the shaft. It is particularly preferred that the slot extends parallel to the longitudinal axis of the shaft. As a result, the production can be further simplified, in particular when the torsion region is made by bending a sheet metal strip. In addition, unwanted voltage peaks in the region of the slot can be avoided.
  • the shaft in the torsion region can have a polygonal or an oval outer cross section.
  • the shaft has a circular outer cross section in the torsion region.
  • the associated high symmetry may be particularly suitable for absorbing the forces occurring.
  • the shaft also has a circular inner cross section in the torsion region.
  • the shaft can have a constant wall thickness in at least one cross section through the torsion region, preferably in the entire torsion region.
  • the shaft may also have a circular outer cross section in at least one end region, preferably in both end regions.
  • the shaft has the same cross section in the entire torsion region. As a result, the production can be further simplified.
  • the shaft is made in several parts, that is, that it is made of several separate parts, which may preferably also have a different material composition.
  • the shaft can be made of at least three separate parts, wherein the first two parts can form the two end regions and the third part the torsion region of the shaft. It is particularly preferred that the torsion region of the shaft is welded or soldered to the two end regions. This can be advantageous in terms of manufacturing costs.
  • the composite of the individual parts can be replaced by a plastic casing which is e.g. by overmolding, by coating, as a plastic pipe or as a plastic film, e.g. Shrink film, can be applied, visually appealing, haptically optimized and designed even more secure application.
  • the shaft at least in the torsion region, has a plastic casing, preferably a plastic coating.
  • the torsion area can be the most sensitive area of the torsion bar. Due to the plastic coating, the most sensitive area can be specifically protected.
  • the plastic sheath is preferably made of a thermoplastic and / or an elastomer.
  • the shank is preferably made of metal, in particular of steel.
  • the first coupling may have a polygonal structure, preferably an internal polygon, for example a square.
  • the second coupling may have a polygonal structure, preferably an internal polygon, for example a hexagon.
  • the polygonal structure of the first clutch and / or the second clutch is preferably formed in the shaft.
  • the torsion bar has a rotatably connected to the shaft coupling sleeve, which is arranged longitudinally displaceably on the shaft on the second end portion of the shaft, wherein the second clutch is formed on the coupling sleeve.
  • the internal polygon of the second clutch may be formed in the coupling sleeve.
  • the second clutch is then disengaged and only axial impacts are transmitted from the torsion bar to the expansion anchor.
  • the coupling sleeve is advanced in a second step in the direction away from the first end region and pushed over the nut of the expansion anchor.
  • the torsion bar for tightening the nut is rotatably coupled to the mother.
  • the invention also includes an arrangement consisting of a torsion bar according to the invention, an impact wrench and an expansion anchor with a nut, wherein the torsion bar is non-rotatably coupled at its first coupling with an output spindle of the impact wrench and at its second coupling with the mother of the expansion anchor.
  • a torsion bar according to the invention is preferably designed so that upon reaching a prescribed tightening torque, the impact of the impact wrench used only leads to a torsion of the torsion bar and no longer to a further increase in the Anspannmoments of the armature.
  • FIG. 1 a first embodiment of an inventive torsion bar is shown.
  • the torsion bar has a shank 10 with a first end region 11 and a second end region 12 opposite in the longitudinal direction, that is to say in the direction of the longitudinal axis 19 of the shank 10.
  • a first formed as a square socket first coupling 15 is frontally provided on the shaft 10, via which the shaft 10 rotatably connected to the output spindle 51 of a only in Fig. 4 and only roughly schematically illustrated impact wrench 50, in particular tangential impact wrench, can be coupled.
  • a second coupling 16 designed as an internal hexagon is provided on the front side of the shaft 10, via which the shaft 10 is rotationally fixed with a only in Fig. 4 shown threaded element 62 can be coupled.
  • the torsion bar for setting a in Fig. 4 serve expansion anchor 60, which has an anchor bolt 61 and an expansion sleeve 64 which surrounds the anchor bolt 61, wherein the anchor bolt 61 on the one hand a spreading cone 63 for expanding the expansion sleeve 64 and on the other hand, a thread 67 is arranged on which formed as a nut threaded member 62nd sitting.
  • the shaft 10 has a torsion region 13 between its two end regions 11 and 12.
  • this torsion region 13 acts as a torsion spring, which can partially absorb force peaks of the impact wrench 50. So that the torsion bar rotates specifically in the torsion region 13, the torsion bar in the torsion region 13 has a low torsional stiffness relative to the longitudinal axis 19 compared to the end regions 11 and 12.
  • the shaft 10 In the torsion region 13 of the shaft is designed as a simple slotted round tube, that is, the shaft 10 has there an inner cylindrical cavity 31 and a slot 32 which leads from the outside into the cavity 31.
  • the slot 32 runs preferably parallel to the longitudinal axis 19 of the shaft 10.
  • the first end region 11 and the second end region 12 are connected to the torsion region 13 via welding or soldering points 25 and 26, respectively.
  • the first end region 11 has a connecting piece 21 which protrudes toward the second end region 12.
  • the second end region 12 has a connecting piece 22 which projects toward the first end region 11.
  • the two connecting pieces 21 and 22 protrude into the slotted tube, which forms the torsion region 13, with the slotted tube resting against the lateral surfaces of the two connecting pieces 21 and 22.
  • FIG. 2 A further embodiment of a torsion bar according to the invention is shown in FIG FIG. 2 shown.
  • the embodiment of the FIG. 2 differs from the embodiment of the FIG. 1 only in that according to the embodiment of the FIG. 2 the shaft 10 is partially surrounded by a sleeve-shaped plastic sheath 90, which protects the torsion 13.
  • the plastic casing 90 surrounds the torsion region 13 and extends more or less far into the end regions 11 and 12.
  • a third embodiment of an inventive torsion bar is in the Figures 3 and 4 shown.
  • the embodiment of the Figures 3 and 4 differs from the embodiment of the FIG. 1 by the configuration of the second end portion 12 of the shaft 10.
  • the shaft 10 has a coupling sleeve 46 on, which surrounds the shaft 10 at the second end portion 12, and which is slidably mounted on the shaft 10 in the longitudinal direction of the shaft 10.
  • this coupling sleeve 46 for example, designed as a polygonal socket second coupling 16 is provided for the threaded member 62.
  • the coupling sleeve 46 can embrace the threaded element 62 of the expansion anchor 60, and it is made via the second coupling 16 in the coupling sleeve 46, a rotationally fixed connection between the shaft 10 and the threaded member 62.
  • the shaft 10 can have a receptacle 44 for centering the anchor bolt 61 and thus for centering the threaded element 62 arranged thereon relative to the torsion bar.
  • This receptacle 44 can also serve to drive an expansion anchor 60 by means of the torsion bar in a wellbore 68.
  • the impact wrench 50 is replaced by a hammer drill.
  • the hammer drill can be operated both hitting and turning.
  • the torsion bar according to FIG. 3 thus, it can be used both as a setting tool for an expansion anchor 60 and as a tightening tool for a controlled tightening torque.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Springs (AREA)
EP14150260.9A 2013-01-10 2014-01-07 Tige de torsion Withdrawn EP2754534A3 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102013200227.0A DE102013200227A1 (de) 2013-01-10 2013-01-10 Torsionsstab

Publications (2)

Publication Number Publication Date
EP2754534A2 true EP2754534A2 (fr) 2014-07-16
EP2754534A3 EP2754534A3 (fr) 2018-02-28

Family

ID=49885154

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14150260.9A Withdrawn EP2754534A3 (fr) 2013-01-10 2014-01-07 Tige de torsion

Country Status (2)

Country Link
EP (1) EP2754534A3 (fr)
DE (1) DE102013200227A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3135435A1 (fr) 2015-08-25 2017-03-01 HILTI Aktiengesellschaft Outil de pose

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1521461A (en) 1974-10-20 1978-08-16 Irvator Ab Method of fastening a screw threaded fastening element

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5544136A (en) * 1978-09-20 1980-03-28 Yutani Tekko Kk Torsion bar
US5123313A (en) * 1990-12-21 1992-06-23 Ab Momento Torsion socket
US5690006A (en) * 1996-05-21 1997-11-25 Pulliam; Doyle H. Infinitely slide-adjustable socket extender for socket wrenches
DE10026205A1 (de) * 2000-05-26 2001-11-29 Adolf Wuerth Gmbh & Co Kg Vorrichtung zum Verbinden eines Werkzeugs mit einem Antrieb
DE20207976U1 (de) * 2002-05-17 2002-10-02 Georg Schlegel GmbH & Co., 88525 Dürmentingen Drehhilfe zum Festziehen eines Schraubelements
DE102007052772A1 (de) * 2007-11-02 2009-05-07 Compass Corp., Yung-Kang Schraubendrehereinsatz
US8096213B2 (en) * 2007-11-16 2012-01-17 Neil Miers Utility insert tool with spherical retaining ball member and torsion bar for securing detachable utility inserts
TWM397887U (en) * 2010-06-24 2011-02-11 Kwang Yang Motor Co Assisted spark plug disassembly tool
DE102012213432A1 (de) 2012-07-31 2014-05-15 Hilti Aktiengesellschaft Torsionsstab
DE202012103739U1 (de) * 2012-09-28 2012-11-15 Wen Hung Chiang Werkzeugverlängerung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1521461A (en) 1974-10-20 1978-08-16 Irvator Ab Method of fastening a screw threaded fastening element

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3135435A1 (fr) 2015-08-25 2017-03-01 HILTI Aktiengesellschaft Outil de pose
WO2017032642A1 (fr) 2015-08-25 2017-03-02 Hilti Aktiengesellschaft Outil de pose

Also Published As

Publication number Publication date
DE102013200227A1 (de) 2014-07-10
EP2754534A3 (fr) 2018-02-28

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