WO2007012882A1 - Dispositif de serrage pour le serrage d'un disque rotatif sur un outil electrique - Google Patents

Dispositif de serrage pour le serrage d'un disque rotatif sur un outil electrique Download PDF

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Publication number
WO2007012882A1
WO2007012882A1 PCT/GB2006/002852 GB2006002852W WO2007012882A1 WO 2007012882 A1 WO2007012882 A1 WO 2007012882A1 GB 2006002852 W GB2006002852 W GB 2006002852W WO 2007012882 A1 WO2007012882 A1 WO 2007012882A1
Authority
WO
WIPO (PCT)
Prior art keywords
disc
clamping device
handle
power tool
clamping
Prior art date
Application number
PCT/GB2006/002852
Other languages
English (en)
Inventor
Nigel Roberts
Original Assignee
Gmca Pty Ltd
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 Gmca Pty Ltd filed Critical Gmca Pty Ltd
Publication of WO2007012882A1 publication Critical patent/WO2007012882A1/fr

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
    • 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 apparatus relates to a clamping apparatus for use in the selective securing into position of a power tool component and particularly, but not necessarily exclusively, a component in the form of a saw blade or grinding wheel , hereinafter referred to in a non limiting manner as a disc for the purposes of illustration of the invention. Yet further the invention is particularly of use in clamping into position a substantially planar saw disc provided for rotation about a central axis thereof.
  • Clamping means are conventionally provided to clamp and retain in position a substantially planar, circular disc, on an arbour, said arbour driven to rotate said disc when clamped in position thereon such that a series of teeth or abrasive material at the outer periphery thereof can perform a cutting and/or grinding action on a workpiece to which the disc is presented.
  • This form of operation can be incorporated in many power tools such as chop saws, mitre saws, compound saws, circulars saws and the like.
  • a common problem with the conventional clamping means is that a tool is required to be used by the user to release a clamping bolt to allow removal of the worn disc, and then to tighten the bolt to again tighten the new disc into position on the arbour.
  • the aim of the present invention is to provide a clamping mechanism for a disc which provides efficient and effective operation without the need for a tool to be used to do so, while ensuring that the disc can still be effectively clamped in position.
  • a clamping device for use in the clamping of a disc in position for rotation on a power tool, said clamping device including a body having a threaded shaft depending from one side thereof and a handle portion on the opposing side of the body in connection with a cam and biasing means assembly and said device is engaged with the power tool via the threaded shaft and wherein said handle is movable between a first position in which a force is applied to the cam mounted on the body, and a second position to release the force on said cam and when said force is applied to the cam, a clamping action is exerted on the disc via the biasing means.
  • the device includes a plate which lies between the biasing means and the disc so as to transfer the clamping force from the biasing means onto the disc.
  • the plate is provided as a means to allow a keying arrangement between the disc and the power tool.
  • the threaded portion which depends outwardly from the device is received in a threaded aperture in the arbour on which the disc is supported, said arbour rotatable and in turn providing rotation of the disc.
  • the clamping device is screwed into and out of the threaded aperture by the user gripping the handle portion or the body of the device when the handle portion is in the second position.
  • the handle when the handle is in the first position it lies with its longitudinal axis substantially parallel with the disc and in the second position the handle is in a position other than parallel and may in one embodiment have its longitudinal axis substantially perpendicular to the disc.
  • the handle is moved to an intermediate position between said first and second positions, in which the handle lies in the same plane as when in the first position but is slid such that one end protrudes from the body of the clamping device and, from that position the same can be moved to the second position.
  • the handle is normally in the first position when the disc is being rotated and is retained in that position by selective release means which require user operation.
  • the handle can be prevented from moving to the intermediate and second positions until the release means can be operated by the user.
  • the plate against which the cam exerts a force is located on one face of the disc via a resilient means such as a leaf spring which is biased by the cam onto the plate when the handle is in the first position.
  • a resilient means such as a leaf spring which is biased by the cam onto the plate when the handle is in the first position.
  • the arbour includes a portion which protrudes through a fixing aperture in the disc and the said portion contacts against the plate of the fixing device.
  • a power tool incorporating a disc provided to perform a cutting and/or grinding operation when rotated and wherein said disc is clamped in position on the power tool for use, and selectively releasable therefrom using a clamping device as described herein.
  • the disc is coated in an abrasive material at least at the periphery to perform a grinding action when rotated.
  • the disc is provided with teeth at the peripheral edge thereof to perform a cutting action when rotated.
  • the power tool is any of a circular saw, a mitre saw or a chop saw.
  • a clamping device for use in the clamping of a disc in position for rotation on a power tool, said clamping device including a body having a threaded shaft depending from one side thereof and a handle portion on the opposing side of the body in connection with a cam, a plate and biasing means assembly and wherein said handle is movable between a first position in which a force is applied to the cam mounted on the body, and a second position to release the force on said cam and when said force is applied to the cam, said cam exerts a clamping action on the disc via the plate and biasing means and said device is operable without the use of a tool.
  • Figures l a-d illustrate an embodiment of the clamping device of the invention in use.
  • Figures 2a and b illustrate the clamping device in cross section in open and closed positions
  • FIG 3 illustrates in schematic fashion one form of power tool with which the clamping device can be used.
  • a power tool 50 with which a clamping device 2 in accordance with the invention can be used.
  • the power tool in this case is a mitre saw which has a base 52 on which a workpiece to be cut is placed. At the rear of the base there is provided a pivot arm 54 and at the free end of the same is mounted the disc 4 mounted to rotate around an axis 56 when mounted on an arbour at the axis.
  • the drive for rotation is typically provided by a motor 57 in connection therewith. With the disc clamped in position, and the disc rotating, the arm can be lowered down as indicated by arrow 58 to perform a cutting action on the workpiece on the base 52. It will be appreciated that the disc needs to be securely clamped in position, but also needs to be releasable from time to time to allow the same to be replaced, for example when the same becomes worn.
  • the present invention provides a clamping device 2 which allows this clamping and removal to be achieved without the conventional requirement to use a spanner or similar tool to remove a bolt which conventionally was used to clamp the disc in position.
  • a clamping device 2 in use to exert a clamping force on a disc 4, only part of which is shown for illustration purposes.
  • the clamping device has a body 6 with a handle portion 8.
  • FIG. 2a and b the device is shown in more detail.
  • the body and handle 6, 8 are shown as is a threaded shaft 10 which passes into a threaded aperture 12 to secure the device to the arbour 14 of the power tool.
  • the clamping device also includes a plate 16 which acts on the side 4' of the disc 4 under the influence of biasing means in the form of a leaf spring 18 when the handle is in a first, closed clamping position as shown in Figure 2a.
  • the leaf spring is influenced by control portion, hereonin referred to as a cam 20.
  • the cam is moved between a position shown in Figure 2a when the handle is closed in which the same exerts a downward force on the biasing means which in turn exerts a force on the plate, and an open position shown in Figure 2b where the handle is in an open, second, release position and in which the biasing means are not forced towards the plate.
  • the plate 16 can be provided as part of a keying assembly to ensure that the rotation of the disc is achieved by providing a keyed location with the disc.
  • Figure I a the device 2 is shown in a clamping position in which the handle 8 is substantially parallel with the blade and is effectively locked in position via a release mechanism incorporating a spring plate 22 which acts to force the handle against a protrusion 24. This in turn, retains the cam 20 in position, the resilient spring 18 against the plate 16 and hence the disc 4 is clamped and located on the arbour 14.
  • the handle In order to remove the disc 4 the handle is first slid as indicated by arrow 30 in Figure I b to an intermediate position so that a portion of the handle protrudes from the side of the body. In order to achieve this the spring release means 22 is first required to be pressed down by the user to disengage the protrusion 24. The movement of the handle to the position shown increases the mechanical advantage which can be achieved by the user.
  • the handle and or body can be gripped and rotated as indicated by arrow 36 to unscrew the device 2 threaded shaft 10 from the threaded aperture 12 in the arbour 14 and releases the plate of the clamping device from the disc and allows the disc to be removed and replaced.
  • the reverse procedure is followed in that the new disc is placed in position, the plate 16 is placed against the side 4' of the disc, the clamping device shaft 10 is screwed into the threaded aperture 12 and this is performed with the handle 8 in the second open position.
  • the handle is then pivotally moved to the intermediate position from which position the same is slid towards the first clamping position to cause the cam and biasing means 18 to exert the clamping force on the plate 16.
  • the handle is then also engaged with the release means so as to maintain the position of the same during rotation of the disc when operated as part of the power tool.
  • the present invention therefore provides a tool free disc clamping device which is effective and easy to use by the user of the power tool.

Abstract

L'invention concerne un dispositif de serrage (2) utilisé en association avec un outil électrique (50) pour permettre la rotation d'un disque (4) monté sur l'outil électrique et destiné à effectuer une opération d'usinage telle que la coupe ou le meulage. Le dispositif de serrage (2) permet à l'utilisateur de serrer et de desserrer sélectivement le disque (4) sans recourir à un outil séparé, le serrage et le desserrage pouvant être réalisés par la commande sélective d'une poignée (8) montée sur le dispositif de serrage (2).
PCT/GB2006/002852 2005-07-29 2006-07-28 Dispositif de serrage pour le serrage d'un disque rotatif sur un outil electrique WO2007012882A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0515575.9 2005-07-29
GB0515575A GB0515575D0 (en) 2005-07-29 2005-07-29 Clamping apparatus

Publications (1)

Publication Number Publication Date
WO2007012882A1 true WO2007012882A1 (fr) 2007-02-01

Family

ID=34983686

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2006/002852 WO2007012882A1 (fr) 2005-07-29 2006-07-28 Dispositif de serrage pour le serrage d'un disque rotatif sur un outil electrique

Country Status (2)

Country Link
GB (1) GB0515575D0 (fr)
WO (1) WO2007012882A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2127794A1 (fr) * 2007-03-27 2009-12-02 Makita Corporation Dispositif de blocage pour outil de coupe rotatif
CN103442861A (zh) * 2011-03-18 2013-12-11 罗伯特·博世有限公司 工具夹紧装置
EP3216573A1 (fr) * 2016-03-09 2017-09-13 TTI (Macao Commercial Offshore) Limited Mécanisme de libération de lame sans outil pour un outil électrique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4976071A (en) * 1986-12-17 1990-12-11 Robert Bosch Gmbh Clamping fixture for axially clamping a tool in place, in particular a disc
EP1125687A1 (fr) * 2000-02-16 2001-08-22 DIAMANT BOART Société Anonyme Ecrou de serrage et de blocage d'un outil, tel qu'un disque d'une machine d'usinage sur l'arbre de ladite machine
US20030000717A1 (en) * 2000-12-02 2003-01-02 Albrecht Hofmann Hand machine tool comprising two cutting disks, which rotate counter and immediately adjacent to one another, and means for chucking the cutting disks for a hand machine tool of this type
EP1375094A1 (fr) * 2002-06-18 2004-01-02 Black & Decker Inc. Mécanisme de serrage et ensemble d'embrayage pour outil de coupe rotatif

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4976071A (en) * 1986-12-17 1990-12-11 Robert Bosch Gmbh Clamping fixture for axially clamping a tool in place, in particular a disc
EP1125687A1 (fr) * 2000-02-16 2001-08-22 DIAMANT BOART Société Anonyme Ecrou de serrage et de blocage d'un outil, tel qu'un disque d'une machine d'usinage sur l'arbre de ladite machine
US20030000717A1 (en) * 2000-12-02 2003-01-02 Albrecht Hofmann Hand machine tool comprising two cutting disks, which rotate counter and immediately adjacent to one another, and means for chucking the cutting disks for a hand machine tool of this type
EP1375094A1 (fr) * 2002-06-18 2004-01-02 Black & Decker Inc. Mécanisme de serrage et ensemble d'embrayage pour outil de coupe rotatif

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2127794A1 (fr) * 2007-03-27 2009-12-02 Makita Corporation Dispositif de blocage pour outil de coupe rotatif
EP2127794A4 (fr) * 2007-03-27 2012-07-11 Makita Corp Dispositif de blocage pour outil de coupe rotatif
US8366366B2 (en) 2007-03-27 2013-02-05 Makita Corporation Fixing device for rotary blade
CN103442861A (zh) * 2011-03-18 2013-12-11 罗伯特·博世有限公司 工具夹紧装置
US9346183B2 (en) 2011-03-18 2016-05-24 Robert Bosch Gmbh Tool clamping device
EP3216573A1 (fr) * 2016-03-09 2017-09-13 TTI (Macao Commercial Offshore) Limited Mécanisme de libération de lame sans outil pour un outil électrique

Also Published As

Publication number Publication date
GB0515575D0 (en) 2005-09-07

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