EP3411185A1 - Dispositif de serrage - Google Patents

Dispositif de serrage

Info

Publication number
EP3411185A1
EP3411185A1 EP17703093.9A EP17703093A EP3411185A1 EP 3411185 A1 EP3411185 A1 EP 3411185A1 EP 17703093 A EP17703093 A EP 17703093A EP 3411185 A1 EP3411185 A1 EP 3411185A1
Authority
EP
European Patent Office
Prior art keywords
clamping
screw
securing element
clamping device
disc
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.)
Granted
Application number
EP17703093.9A
Other languages
German (de)
English (en)
Other versions
EP3411185B1 (fr
Inventor
Karin Groth
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 EP3411185A1 publication Critical patent/EP3411185A1/fr
Application granted granted Critical
Publication of EP3411185B1 publication Critical patent/EP3411185B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B45/00—Means for securing grinding wheels on rotary arbors
    • B24B45/006—Quick mount and release means for disc-like wheels, e.g. on power tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B27/00—Other grinding machines or devices
    • B24B27/06—Grinders for cutting-off
    • B24B27/08—Grinders for cutting-off being portable

Definitions

  • the present invention relates to a clamping device for axially clamping a disc-shaped tool, preferably a cutting disc, to a flange of a driven spindle of an electric hand tool.
  • the hand tool may, for example, be a cut-off machine.
  • An applied to the spindle drive torque can be transferred exclusively frictionally engaged in the conventional design of the disc-shaped tools on the disc-shaped tools, as they have only a simple, central bore as an interface and thus provide no attack surfaces for a positive connection.
  • the attachment is accomplished by axially clamping one or more disk-shaped tools against a back flange on the spindle.
  • the task of the clamping element is thus the application of a sufficient axial clamping force, so that the force and torque can be transmitted from the electric power tool to the disc-shaped tool.
  • a sufficient clamping is characterized by the fact that the disc-shaped tools do not slip on the drive spindle.
  • clamping devices of the type mentioned are known. These are, for example, clamping devices that require the use of an additional tool.
  • disk-shaped tools are mounted on electric hand tool machines (e.g., angle grinders, parting cutters) with nuts on the drive spindle and tightened with a separate wrench (e.g., two-hole or open-end wrench).
  • a separate wrench e.g., two-hole or open-end wrench.
  • clamping devices The disadvantage of such clamping devices is that the level of clamping force achieved is not limited by the automatic tightening up and thereby the clamping nut can be biased so strong that the release mechanism by hand can not be solved.
  • Another disadvantage is that even the resulting in the outlet of the power tool inertia reaction moments are transmitted to the clamping nut, which can lead to an automatic running of the clamping nut and the disc-shaped tools especially for hand tools with active discharge brake. From the running parts is a threat to the operator of the power tool.
  • Another possibility known from the prior art to make a separate key superfluous is to design the clamping device in such a way that a manual force is sufficient during assembly in order to achieve sufficient clamping of the disk-shaped tool on the handheld power tool. For either the hand strength can be increased and / or the friction losses can be minimized in order to achieve a higher clamping force from the same, limited manual force.
  • a known solution for improved utilization of the tightening torque in a high axial clamping force during clamping consists of a secondary thread in which balls rotate, which is effective in the last phase of the tightening process.
  • Such a solution is known, for example, from the European publication EP 0 846 526 A2.
  • this tensioning device Disadvantage of this tensioning device is that the dynamic reaction forces are not decoupled from the threaded portion and thereby the clamping device can tighten on the one hand excessively automatically and on the other can run off in an abrupt stopping of the spindle.
  • the object is achieved, in particular, by providing a clamping device for axially clamping a disk-shaped tool, preferably a cutting disk, on a flange of a drivable spindle of a handheld power tool, with a clamping disk frictionally engaged with the tool in the clamped state, a central screw which is in a threaded receiving opening formed in an end face of the spindle, can be screwed, with a control element which is rotatably connected to the screw, so that an initiated in the control hand force is transmitted as a tightening torque on the screw, and a first Secured element, which is designed to cooperate with a corresponding, provided on the flange second securing element such that when the screw is at least partially inserted into the receiving opening, the clamping disc to the flange positively secured against rotation is, wherein the tensioning disc is rotatable relative to the screw and the operating element.
  • the first securing element of the clamping device is rotatable relative to the screw and rotatably mounted to the clamping disk. In this way it can be ensured that a torque applied by the user and acting on the screw or unit of screw and operating element is converted in a particularly efficient manner into an axially acting clamping force for securing the disc-shaped tool to the drivable spindle of the hand tool.
  • the invention includes the recognition that by the fact that the clamping disc is freely rotatable relative to the screw or the driven unit of screw and control element, a relative position in the circumferential direction between the clamping plate and screw or between the clamping plate and control element is not clearly defined. Thus is also one Position between the first securing element and the corresponding second securing element when screwing the central screw in the formed on the end face of the spindle receiving opening with thread not defined.
  • the first securing element is designed in the form of a sleeve with a polygonal inner profile and the second securing element includes a corresponding to the polygonal inner profile of the first securing element outer profile, so that the first securing element can be pushed onto the second securing element is.
  • the clamping disk includes a central recess and the first securing element includes a corresponding to the central recess outer profile, so that the first securing element can be inserted into the clamping disk.
  • the clamping disk and the first securing element is designed in one piece. In this way, an even better force or torque transmission can be ensured by the clamping disk on the first fuse element.
  • the screw is designed so that a thread of the screw is engageable only in the thread of the receiving opening, if in an assembled state of the clamping device, the first securing element at least partially with the second Fuse element interacts positively.
  • the operating element is designed as a lid, which preferably surrounds the clamping disk at least in sections.
  • the tensioning device has a bearing.
  • the bearing is an axial needle bearing.
  • the bearing is arranged for the rotational decoupling of screw and clamping disk, but in particular preferably not exclusively when the clamping disk is rotationally secured to the flange in a form-fitting manner.
  • the operating element, the clamping disk and the first securing element are arranged coaxially with each other on the screw.
  • the operating element, the clamping disk and the first securing element are held by at least one locking ring in or at least partially in the operating element.
  • FIG. 1 shows a side view of a clamping device according to the invention with a disk-shaped tool in an assembled state of the clamping device.
  • Fig. 2 is a perspective view of the tensioning device in a disassembled state of the tensioning device without the disc-shaped tool;
  • FIG. 3 is a perspective view of the tensioning device in a disassembled state of the tensioning device
  • Fig. 4 is a side sectional view of the clamping device along the section line A - A in
  • FIG. 4a shows a sectional view of the tensioning device along the section line B-B in FIG. 4;
  • Fig. 5 is another side sectional view of the clamping device along the section line
  • FIG. 5a shows a sectional view of the clamping device along the section line B - B in FIG. 5;
  • Fig. 6 is a perspective view of the spindle
  • Fig. 7 is a side sectional view of the spindle
  • FIG. 8 is a perspective view of the first securing element
  • FIG. 1 An inventive clamping device 1 is shown in Fig. 1 in an assembled state.
  • the tensioning device 1 essentially comprises a screw 2, an operating element 3, a first running disk 4, an axial needle bearing 5, a second running disk 6, a tensioning disk 7, a first securing element 8 and a counter-tensioning disk 9 (compare FIGS , 3).
  • the tensioning device 1 interacts with a spindle 10 of a hand-held power tool not shown in the figures.
  • the spindle 10 further includes a second securing element 12, which is located on a flange 13 of the spindle 10 (see Fig. 2, 3).
  • the clamping device 1 serves for the axial clamping of a disk-shaped tool 14 on the flange 13 of the driven spindle 10 shown on the right side in FIG. 1.
  • the driven spindle 10 is associated with a hand tool, not shown in the figures, which may be, for example, a power cutter.
  • the disk-shaped tool 14 may be, for example, a plate-shaped grinding wheel.
  • the disk-shaped tool 14 may be a flat cutting disk.
  • the hand tool not shown, it may be an angle grinder or the like.
  • the clamping device according to the invention can also be realized in a non-handheld machine tool.
  • the clamping device 1 includes a clamping plate 7 which rests in an assembled or clamped state of the clamping device 1 frictionally on the tool 14, for example, a plate-shaped grinding wheel to clamp it to the spindle 10 of the hand tool, not shown.
  • screw 2 When screw 2 is a central screw, which holds the entire clamping device 1 in the assembled state.
  • the screw 2 includes a screw head 2a and a thread 2b, which can be screwed into a thread 15 which is formed in a receiving opening 16 on a free end face 17 of the spindle 10.
  • the operating element 3 is designed essentially in the form of a lid with a central recess 18. Due to the positive connection of control element 3 and screw 2, the control element 3 is rotatably connected to the screw 2, so that in the control element 3 by rotation of the control element 3 in radial direction R initiated manual force is transmitted as a tightening torque on the screw 2. About a corresponding profile device to the central recess 18 of the control element 3 and the screw head 2a of the screw 2, the positive connection between the screw 2 and the control element 3 is achieved.
  • the screw 2 and the control element 3 may also be designed in one piece or materially connected (gluing, welding, soldering or the like) to one another.
  • the first securing element 8 of the tensioning device 1 is configured in the embodiment shown in FIG. 1 as a sleeve with a hexagonal inner profile 19 (see also FIGS. 8 and 9). It is essentially like a nut with a hexagon socket.
  • the first securing element 8 contains at one end 8a a polygonal outer profile 20. As shown particularly in FIG. 8, the polygonal outer profile 20 is essentially a square profile with bevelled corners.
  • the clamping disk 7 contains in the middle a substantially square recess 21.
  • the shape of the recess 21 corresponds to the square outer profile 20 of the first securing element 8, so that the square outer profile 20 of the first securing element 8 can be inserted into the square recess 21 of the clamping disk 7 , As a result, the first securing element 8 and the clamping disk 7 are positively connected to one another.
  • first securing element 8 and the tensioning disk 7 may also have other outer profile and recesses corresponding to each other.
  • first securing element 8 and the tensioning disk 7 can also be embodied in one piece or can be connected to one another in a material-locking manner.
  • the second securing element 12 includes a hexagonal outer profile 22 corresponding to the hexagonal inner profile 19 of the first securing element 8. If the hexagonal inner profile 19 of the first securing element 8 is connected to the hexagonal outer profile 22 of the second securing element 12 are engaged, so not only the first securing element 8 to the second securing element 12 but also the clamping plate 7 to the flange 13 is positively secured against rotation with respect to each other.
  • this is realized such that the outer profile 20 of the first securing element 8 protrude into the corresponding recess 21 of the clamping disk 7, the inner profile 19 of the first securing element 8 is pushed onto the outer profile 22 of the second securing element 12 and Screw 2 in the direction of N by the clamping disk 7, the first securing element 8, the disk-shaped tool 14 and into the threaded opening 15 equipped with the receiving opening 16 of the spindle 10 is screwed (see Fig. 3).
  • the clamping disk 7, the first securing element 8 and the second securing element 12 are thus positively connected to each other.
  • the first securing element 8 of the clamping device 1 is rotatable relative to the screw 2 and rotatably mounted to the clamping disk 7.
  • the clamping device 1 in the present case has a bearing 23 in the form of an axial needle bearing, which is supported between two running disks 24, 25.
  • the designed as an axial needle bearing bearing 23 is the rotational decoupling of screw 2 and clamping plate 7 when the clamping plate 7 is rotationally secured to the flange 13 positively.
  • the screw 2, the operating element 3, the two running disks 24, 25, the first securing element 8 and the tensioning disk 7 are arranged coaxially with one another.
  • the operating element 3, the clamping disc 7, the first securing element 8, the two pulleys 24, 25 and the axial needle bearing 23 are arranged on the screw 2 and on this by a securing ring 26 in shape secured by a snap ring.
  • An additional ring 27 serves to deflect the axially acting force in the assembled state of the tensioning device 1 so that a radial force component is produced on the securing ring 26.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)

Abstract

L'invention concerne un dispositif de serrage destiné à fixer axialement un outil en forme de disque, de préférence un disque de découpe, à une bride d'une broche entraînable d'une machine-outil à main. Le dispositif de serrage comprend un disque de serrage venant en appui par friction sur l'outil à l'état serré, une vis centrale qui peut être vissée dans un orifice de réception muni d'un filetage formé dans une face d'extrémité de la broche, un élément d'actionnement relié solidairement en rotation à la vis de façon à transmettre à la vis, sous la forme d'un moment de rotation, une force manuelle introduite dans l'élément de commande, et un premier élément de fixation conçu pour coopérer avec un second élément de fixation correspondant, prévu au niveau de la bride, de telle sorte que, lorsque la vis est insérée au moins partiellement dans l'orifice de réception, le disque de serrage est solidaire en rotation de la bride par complémentarité de formes. Le disque de serrage peut tourner par rapport à la vis et à l'élément d'actionnement. Le premier élément de fixation du dispositif de serrage peut tourner par rapport à la vis et est monté solidairement en rotation par rapport au disque de serrage.
EP17703093.9A 2016-02-02 2017-01-31 Dispositif de serrage Active EP3411185B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP16153793.1A EP3202533A1 (fr) 2016-02-02 2016-02-02 Dispositif de serrage
PCT/EP2017/052000 WO2017134037A1 (fr) 2016-02-02 2017-01-31 Dispositif de serrage

Publications (2)

Publication Number Publication Date
EP3411185A1 true EP3411185A1 (fr) 2018-12-12
EP3411185B1 EP3411185B1 (fr) 2023-10-18

Family

ID=55275034

Family Applications (2)

Application Number Title Priority Date Filing Date
EP16153793.1A Withdrawn EP3202533A1 (fr) 2016-02-02 2016-02-02 Dispositif de serrage
EP17703093.9A Active EP3411185B1 (fr) 2016-02-02 2017-01-31 Dispositif de serrage

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP16153793.1A Withdrawn EP3202533A1 (fr) 2016-02-02 2016-02-02 Dispositif de serrage

Country Status (3)

Country Link
US (1) US11103973B2 (fr)
EP (2) EP3202533A1 (fr)
WO (1) WO2017134037A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3476539A1 (fr) * 2017-10-27 2019-05-01 HILTI Aktiengesellschaft Dispositif de serrage et machine-outil manuelle
EP3769913A1 (fr) * 2019-07-24 2021-01-27 Hilti Aktiengesellschaft Machine-outil

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57171601U (fr) * 1981-04-24 1982-10-28
DE3824040C1 (en) 1987-02-21 1989-11-23 Robert Bosch Gmbh, 7000 Stuttgart, De Clamping device for axially clamping a tool, in particular a disk
AU3530497A (en) 1996-12-05 1998-06-11 Power Tool Holders Incorporated Improved ball screw clamping device
DE10311491B4 (de) 2003-02-19 2005-08-18 Neudecker & Jolitz Gmbh & Co. Schnellspannmutter
DE10352288A1 (de) * 2003-11-08 2005-06-09 Robert Bosch Gmbh Werkzeugaufnahmevorrichtung
TWM273437U (en) * 2004-12-10 2005-08-21 Rexon Ind Corp Ltd Device for securing saw blade to motor of power tool
US7186172B1 (en) * 2006-05-15 2007-03-06 Nao Enterprise, Inc. Spring force adapter for round blade for a grinder
DE102006000360A1 (de) * 2006-07-20 2008-01-24 Hilti Ag Werkzeugaufnahme für ein scheibenförmiges Werkzeug
JP5275044B2 (ja) * 2007-01-09 2013-08-28 株式会社マキタ 回転刃具の固定装置
US10549449B2 (en) * 2013-11-25 2020-02-04 Robert Bosch Gmbh Tool free bolt system for a saw blade
JP6400460B2 (ja) * 2014-01-30 2018-10-03 株式会社マキタ 切断機

Also Published As

Publication number Publication date
US20190039205A1 (en) 2019-02-07
EP3202533A1 (fr) 2017-08-09
WO2017134037A1 (fr) 2017-08-10
EP3411185B1 (fr) 2023-10-18
US11103973B2 (en) 2021-08-31

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