EP4227040A1 - Dispositif de serrage et machine-outil portative - Google Patents

Dispositif de serrage et machine-outil portative Download PDF

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Publication number
EP4227040A1
EP4227040A1 EP23173701.6A EP23173701A EP4227040A1 EP 4227040 A1 EP4227040 A1 EP 4227040A1 EP 23173701 A EP23173701 A EP 23173701A EP 4227040 A1 EP4227040 A1 EP 4227040A1
Authority
EP
European Patent Office
Prior art keywords
clamping device
coupling module
clamping
screw
drive spindle
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.)
Pending
Application number
EP23173701.6A
Other languages
German (de)
English (en)
Inventor
Thomas Blatz
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 EP4227040A1 publication Critical patent/EP4227040A1/fr
Pending legal-status Critical Current

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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
    • B24B23/028—Angle tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D7/00—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor
    • B24D7/06—Bonded abrasive wheels, or wheels with inserted abrasive blocks, designed for acting otherwise than only by their periphery, e.g. by the front face; Bushings or mountings therefor with inserted abrasive blocks, e.g. segmental
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27B—SAWS FOR WOOD OR SIMILAR MATERIAL; COMPONENTS OR ACCESSORIES THEREFOR
    • B27B5/00—Sawing machines working with circular or cylindrical saw blades; Components or equipment therefor
    • B27B5/29—Details; Component parts; Accessories
    • B27B5/30—Details; Component parts; Accessories for mounting or securing saw blades or saw spindles
    • B27B5/32—Devices for securing circular saw blades to the saw spindle

Definitions

  • the present invention relates to a clamping device for the axial clamping of a tool disk on a flange assigned to a drive spindle of a hand-held power tool.
  • the clamping device has a screw which, in order to clamp the tool disk, is to be screwed into an internal thread of the drive spindle.
  • clamping devices are basically known from the prior art. Also known from the prior art are clamping devices with a clamping nut, in particular designed as a two-hole nut, which is to be fastened to the drive spindle with a corresponding tool. However, the present invention relates to a different class of clamping devices, namely those that have a screw that is to be screwed into an end internal thread of the drive spindle.
  • the object is achieved in that the screw is mounted in a coupling module of the clamping device, the coupling module having an inner contour which is paired or can be paired with the drive spindle in a form-fitting, non-rotatable manner in the circumferential direction.
  • the clamping device has the advantage that it can neither be tightened nor loosened during operation of the hand-held power tool because the coupling module, as part of the clamping device, is paired with the drive spindle in a form-fitting, non-rotatable manner.
  • the inner contour of the coupling module is designed as a hexagonal profile.
  • a corresponding outer contour of the drive spindle is preferably designed as an external hexagon.
  • Alternative form-locking non-rotating pairings for example in the sense of a form-locking shaft-hub connection, can be used.
  • the internal thread of the drive spindle is preferably an end internal thread.
  • the internal thread can be positioned in the axial direction opposite a top surface of the drive spindle be reset.
  • the screw preferably protrudes in the axial direction beyond the coupling module, in particular opposite the cylindrical section of the coupling module.
  • the coupling module is preferably of cylindrical design.
  • the coupling module has a cylindrical section that can protrude through a central opening of the tool disk.
  • the cylindrical section of the coupling module can protrude into a central opening of the flange.
  • the tensioning device has a hand knob which is formed in a form-fitting, non-rotatable manner with the screw in the circumferential direction.
  • the clamping device can be handled particularly easily. There is no need for an additional assembly tool, such as an assembly wrench.
  • the clamping device has a clamping element, which can be subjected to an axial clamping force by means of the coupling module, in order to clamp the tool disk against the flange in this way.
  • the clamping element is particularly preferably designed as a spring steel sheet.
  • the spring plate can be disc-shaped.
  • the screw is mounted in the coupling module via a roller bearing. Because head friction of the clamping element can be reduced with the aid of the roller bearing, an increased clamping force of the clamping device is achieved.
  • the roller bearing is particularly preferably designed as an angular ball bearing.
  • the angular contact ball bearing preferably has a contact angle between 35° and 45°.
  • the contact angle can be 40°. Due to the diagonal contact angle of the rolling elements, especially in an angular contact ball bearing, the clamping device wedges radially towards the end of the clamping process. This provides increased security against accidental loosening.
  • the clamping device has a clamping element in the form of a spring plate, which is preferred, the clamping device has increased insensitivity to settlement, since the spring plate is in frictional contact with the tool disk, which compensates for thermal expansion.
  • the tensioning device has an elastomer ring, which is preferably arranged between a head of the screw and a collar of the coupling module.
  • the clamping device can have a retaining ring, by means of which the coupling module is held on the screw.
  • a plate spring can also be provided instead of an elastomer ring.
  • the disc spring can serve to to seal a grease space between the screw head and the collar of the coupling mode.
  • the disk spring can also prestress the hand knob axially.
  • the tensioning device has a stop, via which a deflection of the tensioning member is directly or indirectly limited.
  • the stop is preferably designed as an annular collar and is arranged between the spring plate and the tool disk to be accommodated. If the tool disk comes into contact with the stop during the clamping process, a deflection of the spring element in the axial direction is limited.
  • a hand-held power tool preferably in the form of a grinder or cut-off grinder, with a drive spindle, which preferably has an internal thread at the end, and with a clamping device of the type described above Inner contour of the coupling module is paired or pairable.
  • the hand-held power tool comprises a flange which is or can be connected to the drive spindle in a form-fitting, non-rotatable manner by means of an anti-rotation device in the circumferential direction.
  • the handheld power tool according to the invention can be advantageously further developed in a corresponding manner by the features explained with reference to the clamping device.
  • a preferred embodiment of a clamping device 10 according to the invention is shown in 1 shown.
  • the clamping device 10 serves to clamp a tool disk 300 in the axial direction AR.
  • the tool disk 300 is to be braced between the clamping device 10 and a flange 30 , the flange 30 being associated with a drive spindle 20 of a hand-held power tool 100 .
  • the flange 30 has an anti-twist device 24 in the form of a lateral recess, so that the flange placed on the drive spindle 20 is positively connected to the drive spindle 20 in the circumferential direction U so that it cannot be twisted.
  • the clamping device 10 has a screw 2 which is to be screwed into an end internal thread 22 of the drive spindle 20 in order to clamp the tool disk 300 .
  • a coupling module 1 of the clamping device 10 provided according to the invention can already be seen to some extent, in which the screw 2 is centrally mounted.
  • the inner contour of the invention is later with reference to 2 explained in more detail.
  • the clamping device 10 has a hand knob 3 .
  • This is used for manually screwing the screw 2 into the internal thread 22 and thus for axially clamping the tool disk 300 between the clamping device 10 and the flange 30.
  • a head of the screw 12 has an outer hexagonal contour, for example, which is embedded in a corresponding inner hexagonal contour of the hand knob 3 .
  • almost any other suitable contour can also be used as an alternative to the hexagonal contour.
  • the drive spindle 20 has an outer contour, which is present, for example, designed as a hexagonal profile.
  • An inner contour of the coupling module 1, not shown here, can be paired with a form fit to this outer contour 26.
  • a form-fitting non-rotating pairing between the coupling module 1 and the outer contour 26 is achieved when the clamping device 10 is clamped, with the coupling module 1 at least partially passing through a central opening 301 of the tool disk 300 protrudes.
  • FIG. 2 now shows the clamping device 10 of 1 in top view ( Figure 2A ) as well as in bottom view ( Figure 2B ).
  • the Tensioning device 10 also has a tensioning element, which is designed here, for example, in the form of a plate-shaped spring plate 4 .
  • the actual clamping force is applied to the tool disk 300 by means of the spring plate 4 .
  • FIG 2B the central screw 2 of the clamping device 10 is clearly visible.
  • the screw is mounted in the coupling module 1 of the clamping device 10, more precisely, the screw 2 is mounted coaxially in the coupling module 1.
  • a cylindrical section 13 of the coupling module 1 is clearly visible, with the cylindrical section 13 protruding at least in sections through the central opening 301 of the tool disk 300 when the tool disk 300 is clamped (cf. 1 ) runs.
  • the coupling module 1 has an inner contour 16 which, in the circumferential direction UR, is positively secured against rotation with the drive spindle 20 (cf. 1 ) can be paired.
  • the inner contour 16 is designed as a hexagonal profile.
  • FIG. 3 now shows the preferred embodiment of the clamping device 10 of the previous figures in an exploded view.
  • the screw 2 can be seen with its screw head 12 which, for example, has an external hexagonal contour.
  • a thread 14 of the screw 2 can be seen in the lower area, which turns into an internal thread (cf. 1 : internal thread 22) is to be screwed in.
  • the screw 2 is mounted in the coupling module 1 via a roller bearing, preferably an angular contact ball bearing 5 .
  • An elastomer ring 6 shown below the hand knob 3 serves, among other things, to hold the outer contour of the screw head 12 within a corresponding inner contour of the hand knob 3. This is evident in particular from FIG 4 apparent.
  • the coupling module 1 can be seen below the elastomer ring 6 , which in addition to the already described cylindrical section 13 and the hexagonal inner contour 16 also has a collar 11 .
  • the collar 11 is designed and provided to transmit a clamping force applied via the hand knob 3 and the screw 2 to the spring plate 4 .
  • the coupling module 1 can be paired with the spring plate 4 in a form-fitting, non-rotatable manner, in the assembled state.
  • the coupling module 1 has a module contour 19 below the collar 11 of the coupling module 1 , which corresponds to an inner contour of the spring plate 4 .
  • the module contour 19 is designed as an external square.
  • a retaining ring 7 by means of which the coupling module 1 is held on the screw 2 can be seen below the coupling module 1 .
  • the clamping element here in the form of the spring plate 4, is held on the coupling module 1 by means of a retaining ring 8.
  • the function of the clamping device 10 according to the invention is now with reference to 4 be explained in more detail.
  • the flange 30 (cf. 1 ) is plugged onto the drive spindle 20 of the hand-held power tool 100 .
  • the anti-twist device 24 connects the flange 30 in the circumferential direction U in a form-fitting, non-twistable manner to the drive spindle 20 .
  • the cutting wheel 300 is inserted.
  • the inner contour 16 here a hexagon socket
  • the inner contour 16 first comes into positive, non-rotatable engagement with the outer contour 26 of the drive spindle 20 . This is preferably done before the thread 14 of the screw 2 enters the internal thread 22 of the drive spindle 20 .
  • roller bearing that is preferably provided is designed as an angular contact ball bearing 5, which, for example, has a contact angle BW of 40° (cf. also figure 5 ) having. This increases head friction on the screw head 2, which prevents the clamping device 10 from being released unintentionally.
  • a locking ring 8 shown below the spring plate 4 serves to hold the clamping plate 4 on the coupling module 1.
  • the clamping force is transmitted in the axial direction AR via a collar 11 of the coupling module 1 to the spring plate 4 and from there to the tool disk 300 .
  • the spring plate 4 and the coupling module 1 are coupled to one another in a form-fitting, non-rotatable manner.
  • FIG. 1 shows another preferred exemplary embodiment of a clamping device 10 according to the invention.
  • a roller bearing in the form of an angular contact ball bearing 5 is provided between coupling module 1 and screw 2, which has a contact angle BW of 40° (example).
  • BW contact angle
  • the embodiment of figure 5 a stop 9, via which a deflection of the clamping member, which is designed here as a spring plate 4, can be limited.
  • FIG 5a Another preferred embodiment of a clamping device 10 according to the invention is shown.
  • a roller bearing in the form of an angular contact ball bearing 5 is provided between the coupling module 1 and the screw 2, which has a contact angle BW of 40° (example).
  • a disk spring 6a is provided instead of the elastomer ring 6 for sealing and preloading of the hand knob 3, a disk spring 6a.
  • the disc spring 6a is positioned between an underside of the hand knob 3 and an upper side of the collar of the coupling module 11, so that the spring force of the disc spring 6a acts on the underside of the hand knob 3 and the upper side of the collar of the coupling module 11.
  • the plate spring 6a positioned in this way serves, among other things, to hold the outer contour of the screw head 12 within a corresponding inner contour of the hand knob 3.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Clamps And Clips (AREA)
  • Portable Power Tools In General (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP23173701.6A 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil portative Pending EP4227040A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
EP17198870.2A EP3476539A1 (fr) 2017-10-27 2017-10-27 Dispositif de serrage et machine-outil manuelle
PCT/EP2018/078225 WO2019081275A1 (fr) 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil manuelle
EP18783530.1A EP3700710B1 (fr) 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil manuelle

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
EP18783530.1A Division-Into EP3700710B1 (fr) 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil manuelle
EP18783530.1A Division EP3700710B1 (fr) 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil manuelle

Publications (1)

Publication Number Publication Date
EP4227040A1 true EP4227040A1 (fr) 2023-08-16

Family

ID=60190723

Family Applications (3)

Application Number Title Priority Date Filing Date
EP17198870.2A Withdrawn EP3476539A1 (fr) 2017-10-27 2017-10-27 Dispositif de serrage et machine-outil manuelle
EP23173701.6A Pending EP4227040A1 (fr) 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil portative
EP18783530.1A Active EP3700710B1 (fr) 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil manuelle

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP17198870.2A Withdrawn EP3476539A1 (fr) 2017-10-27 2017-10-27 Dispositif de serrage et machine-outil manuelle

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP18783530.1A Active EP3700710B1 (fr) 2017-10-27 2018-10-16 Dispositif de serrage et machine-outil manuelle

Country Status (5)

Country Link
US (1) US12011802B2 (fr)
EP (3) EP3476539A1 (fr)
JP (1) JP7097957B2 (fr)
CN (1) CN111278601A (fr)
WO (1) WO2019081275A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112846385B (zh) * 2021-01-08 2022-07-26 山东聊城鼎诚激光设备有限公司 一种用于防弹玻纤板等距切割设备
CN113681474A (zh) * 2021-09-08 2021-11-23 江苏锋泰工具有限公司 一种减震轻型橡胶金刚石磨轮的制备方法
CN113696107A (zh) * 2021-09-08 2021-11-26 江苏锋泰工具有限公司 一种减震轻型橡胶金刚石磨轮

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6909435U (de) * 1969-03-07 1969-07-10 Metabowerke Kg Aufspannvorrichtung fuer das saegeblatt bei einer kreissaege
JPH07299743A (ja) * 1994-05-10 1995-11-14 Ryobi Ltd 工具の締付装置
EP2123380A1 (fr) * 2007-01-09 2009-11-25 Makita Corporation Dispositif de fixation pour outil à lame tournante
EP3202533A1 (fr) * 2016-02-02 2017-08-09 HILTI Aktiengesellschaft Dispositif de serrage

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Publication number Priority date Publication date Assignee Title
US3266535A (en) * 1964-06-01 1966-08-16 Singer Co Safety blade clamping means for portable power saws
JPS49146591U (fr) 1973-04-13 1974-12-18
JPS6124153U (ja) 1984-07-13 1986-02-13 芝浦メカトロニクス株式会社 デイスクグラインダ
DE3841181A1 (de) * 1988-12-07 1990-06-13 Bosch Gmbh Robert Handwerkzeugmaschine mit einer mehrteiligen handbetaetigbaren schnellspanneinrichtung
CA2092701A1 (fr) * 1990-09-12 1992-03-13 Norman Leslie Matthews Fixation
JPH0727121A (ja) * 1993-06-30 1995-01-27 Jacobs Japan Inc 締付け用ネジ
JPH07229743A (ja) 1994-02-18 1995-08-29 Haruaki Yamashita レーザ望遠鏡及びレーザ通信方法
US6273659B1 (en) * 1997-02-17 2001-08-14 Power Tool Holders Incorporated Locking mechanism for a rotary working member
US6843627B2 (en) * 2001-12-12 2005-01-18 Credo Technology Corporation Wrenchless blade clamp assembly
JP4964642B2 (ja) * 2007-03-27 2012-07-04 株式会社マキタ 回転刃具の固定装置
CN201284780Y (zh) 2008-08-18 2009-08-05 强网工业股份有限公司 容易装卸的锁紧装置
EP3074193B1 (fr) * 2013-11-25 2018-03-07 Robert Bosch GmbH Système de boulon sans outil pour lame de scie
JP6400460B2 (ja) * 2014-01-30 2018-10-03 株式会社マキタ 切断機
KR101578730B1 (ko) 2014-09-22 2015-12-21 계양전기 주식회사 그라인더 휠 잠금장치
CN205552271U (zh) 2016-03-18 2016-09-07 浙江亚特电器有限公司 一种抛光机
US20170276166A1 (en) * 2016-03-22 2017-09-28 Donald L Gunnin Backing nuts holder

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE6909435U (de) * 1969-03-07 1969-07-10 Metabowerke Kg Aufspannvorrichtung fuer das saegeblatt bei einer kreissaege
JPH07299743A (ja) * 1994-05-10 1995-11-14 Ryobi Ltd 工具の締付装置
EP2123380A1 (fr) * 2007-01-09 2009-11-25 Makita Corporation Dispositif de fixation pour outil à lame tournante
EP3202533A1 (fr) * 2016-02-02 2017-08-09 HILTI Aktiengesellschaft Dispositif de serrage

Also Published As

Publication number Publication date
JP7097957B2 (ja) 2022-07-08
US12011802B2 (en) 2024-06-18
EP3700710B1 (fr) 2023-07-26
JP2020536760A (ja) 2020-12-17
EP3476539A1 (fr) 2019-05-01
EP3700710A1 (fr) 2020-09-02
CN111278601A (zh) 2020-06-12
US20200324385A1 (en) 2020-10-15
WO2019081275A1 (fr) 2019-05-02

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