EP2062699A2 - Scie circulaire motorisée dotée d'un capot protecteur rotatif - Google Patents

Scie circulaire motorisée dotée d'un capot protecteur rotatif Download PDF

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Publication number
EP2062699A2
EP2062699A2 EP08013500A EP08013500A EP2062699A2 EP 2062699 A2 EP2062699 A2 EP 2062699A2 EP 08013500 A EP08013500 A EP 08013500A EP 08013500 A EP08013500 A EP 08013500A EP 2062699 A2 EP2062699 A2 EP 2062699A2
Authority
EP
European Patent Office
Prior art keywords
circular saw
drive spindle
locking
locking device
saw 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.)
Granted
Application number
EP08013500A
Other languages
German (de)
English (en)
Other versions
EP2062699B1 (fr
EP2062699A3 (fr
Inventor
Hans Ruf
Olaf Schmid
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.)
Metabowerke GmbH and Co
Original Assignee
Metabowerke GmbH and Co
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 Metabowerke GmbH and Co filed Critical Metabowerke GmbH and Co
Publication of EP2062699A2 publication Critical patent/EP2062699A2/fr
Publication of EP2062699A3 publication Critical patent/EP2062699A3/fr
Application granted granted Critical
Publication of EP2062699B1 publication Critical patent/EP2062699B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • B27G19/04—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws for manually-operated power-driven circular saws
    • 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
    • B27B5/38—Devices for braking the circular saw blade or the saw spindle; Devices for damping vibrations of the circular saw blade, e.g. silencing

Definitions

  • the invention relates to a motor-driven circular saw with a machine housing and a comparatively stationary and rotatably mounted drive spindle, with respect to which a saw blade is rotatably mounted, wherein the saw blade protrudes over a bearing surface of the circular saw to the processing depth, and with a protective cover for the saw blade, the articulated to the machine housing and in the plane of the saw blade or a parallel plane is rotatable and the saw blade overlaps radially outside, wherein the guard is spring biased towards an end position and in this end position at least over the support surface of the circular saw projecting part of the saw blade.
  • Such circular saws are widely known, wherein the protective hood is usually designed so that it is automatically rotated in the execution of the saw cut against the spring bias by the workpiece itself and so releases the saw blade for the execution of the saw cut. After the saw cut, the guard will automatically snap to its final position, overhanging the saw blade, protecting the user from injury. If it is mentioned above of a rotatable protective cover, then this should also detect a pivotable articulation of the protective cover relative to the machine housing, so a not necessarily concentric to the drive spindle articulation of the protective hood.
  • the present invention has the object to further improve a generic circular saw in that the saw blade change is more comfortable for the user.
  • the portable circular saw according to the invention it is thus possible to lock the guard in a position largely releasing the saw blade, so that the saw blade is more accessible.
  • the locking device provided for this purpose additionally blocks the drive spindle, the saw blade can be easily detached.
  • the formation of the protective hood with a graspable behind in its scope / rotational direction by a locking member allows a structurally simple and therefore advantageous open position of the guard.
  • a saw blade change in a few simple steps in a comfortable manner possible by a user first moves the guard against the spring bias in the direction of its other end position and thereby actuates the locking device. It is so the locking member in locking engagement with the engaged behind reachable section of the protective cover.
  • the drive spindle is blocked by the locking device, so that the saw blade can usually be loosened and removed by unscrewing a clamping screw on the front side of the drive spindle and replaced with a new one.
  • the mentioned graspable portion of the guard could be formed by a per se any projection of the guard.
  • the grippable portion is formed by an opening in a wall of the protective hood.
  • the graspable portion can then be obtained in a simple manner, for example by punching a sheet metal part in the course of the production of the guard.
  • the above-mentioned opening can be formed in a further embodiment of this inventive concept as in particular in the circumferential direction open-edged opening.
  • the opening has a first edge-open section in the circumferential direction and a second adjacent thereto in the radial direction inward second portion. In this way, the locking member of the locking device in the course of pivoting of the protective cover in the first open-edge section in the circumferential direction and then be brought by moving radially inward into the subsequent second section and thus in the rear grip position.
  • first and the second section are separated from each other by a substantially extended in the circumferential direction nose of the guard. This opens the Possibility of self-centering training of the lock in the end position of the guard.
  • the locking member of the locking device is held by radially acting positive engagement with the guard automatically in the locked position.
  • This can be achieved, for example, in an advantageous manner in that the engageable portion of the guard also causes this radially acting positive connection between the guard and the locking member of the locking device, so that the locking device automatically remains in its locking position blocking the guard and the drive spindle.
  • the radially acting positive locking can be formed by the aforementioned, circumferentially extended nose between the first and the second portion of the opening in the wall of the protective hood. This nose prevents such a case that the locking member of the locking device can be moved in the release direction. Only when the protective cover is deliberately slightly twisted, the locking device can be solved.
  • a particular one-piece locking member of the locking device causes both the radial engagement in Arreti LucassEnglishungen the drive spindle and the open position of the protective hood, which allows comfortable operation of the locking device.
  • the locking member of the locking device has a respect to the drive spindle radially extending portion which engages in Arreti LucassEnglishungen the drive spindle, and a respect to the saw blade plane transversely and in particular vertically extending portion which cooperates with the engageable behind portion of the protective hood.
  • an integrally formed locking member is a metallic bending stamped part. It is thus easy to produce and economically prone to failure due to its one-piece design.
  • the locking member is further arranged in an advantageous manner relative to the drive spindle in the radial direction displaceable. It can be brought by a simple linear displacement into engagement with the Arreti Lucassappelisme the drive spindle.
  • the blocking member is spring-biased in the release direction, in particular radially outward.
  • the locking device comprises a relative to the drive spindle radially and operable from outside of the machine housing pusher.
  • a handle operation can be coupled particularly easily with a radial displaceability of the locking member of the locking device.
  • the pusher is arranged in an advantageous manner in an opening of the machine housing and with respect to the drive spindle radially displaceable.
  • the use of a pusher arrangement in the locking device in conjunction with a linear displaceability has the further advantage that in this way a guide function for the locking member of the locking device is realized, without the more extensive complex storage elements must be used.
  • an embodiment proves to be advantageous in which an intermediate position of the locking device is given, in which the protective hood is secured against turning back, however, the drive spindle is still manually rotatable.
  • the operation of the locking device designed as a result of this two-stage blocking The user thereby twists the protective cover in the direction of its end position until the locking member of the locking device secures the protective hood against swinging back.
  • the user rotates the saw blade and thus the drive spindle until a Arreti Lucassbloodung the drive spindle is aligned with the locking member of the locking device, so that the locking member can then reach the final locking position.
  • the protective hood is first locked, and then the drive spindle is brought into a suitable rotational position for blocking.
  • the figures show a generally designated by the reference numeral 2 circular saw with a machine housing 4 and a contrast fixed and rotatably mounted drive spindle 6.
  • a in Figure 1c only indicated saw blade 8 is rotatably mounted on the front side drive spindle 6 with a clamping screw, not shown.
  • the saw blade 8 projects beyond the working depth over a bearing surface 10 of the circular saw.
  • the circular saw 2 further comprises a rotatable protective cover 12, which overhangs the saw blade 8 radially outward.
  • the protective cover 12 is in the direction of the in FIG. 2a shown biased end position in which it overhangs the over the support surface 10 of the machine housing 4 protruding part of the saw blade 8.
  • a spring element 14 is provided ( FIG. 2 ).
  • the guard 12 can be locked in its the protruding part of the saw blade releasing end position.
  • the drive spindle 6 can be fixed against rotation.
  • the protective hood 12 has a portion 20 which can be gripped behind in its circumferential / rotational direction 18, with which a blocking element 22 of the locking device 16 cooperates interlockingly by means of a (blocking) section 42 (see FIG FIGS. 1a to c ).
  • the mentioned graspable portion 20 of the protective cover 12 is bounded or formed by an opening 24 in a wall 26 of the protective cover 12. However, it could also be formed by integrally formed or shaped extensions of the protective cover 12.
  • the opening 24 in the circumferential direction 18 is open-edged. It has a first edge-open section 28 in the circumferential direction and a second section 32 adjoining it in the radial direction 30. Between the first portion 28 and the second portion 32, a nose 34 is formed.
  • FIG. 1a is the blocking member 22 of the locking device 16 in its release position. In this release position, the protective cover 12 in the circumferential direction 18 in the in FIG. 1b move open position shown.
  • the locking member 22 of the locking device 16 is held by radially acting positive engagement with the protective cover 12, namely in the example illustrated by way of the nose 34, automatically in the locked position.
  • the nose 34 prevents the locking member 22 can pass back radially outward.
  • the guard 12 presses due to their spring bias in the circumferential direction 18 against the locking member 22 and is thus secured against pivoting back.
  • the blocking member 22 is also fixed in the blocking position by the mentioned radially acting positive engagement with the protective hood 12. In this locking position of the locking device, the saw blade 8 can be solved by loosening the clamping screw, not shown on the front side of the drive spindle 6, removed and replaced by a new one.
  • the guard 12 is slightly moved in the circumferential direction in a clockwise direction, so that the locking member 22 is released from the engage behind portion 20 of the guard and the nose 34 and the guard 12 then pass under the action of the spring member 14 in its the saw blade circumferential position can.
  • the radial mandrel 36 of the locking member 22 is pulled out of the Arreti Lucassappelung 38 of the drive spindle 6.
  • the locking member 22 is formed together with its radial mandrel 36 as a one-piece, metallic bending stamped part 40, as best seen in the FIG. 3 is apparent.
  • the blocking member 22 comprises, starting from an elongate sheet-metal blank, the above-mentioned punched-out section 42, which is bent substantially perpendicularly out of the plane of the board, and a second section 44 remaining in the board plane.
  • the first section 42 acts in the installation position ( FIG. 3 ) with the engage-behind portion 20 of the protective cover 12 together, and the second portion 44 forms the radial mandrel 36 of the locking member 22 which fixes the drive spindle 6.
  • the locking member 22 is, as from the FIGS. 2 to 4 can be seen, biased outwardly in the radial direction 30 by means of a spring element 46 designed as a compression spring.
  • a radially actuated pusher 48 At the radially outer end of the blocking member 22 and the locking device 16 by means of a radially actuated pusher 48 can be operated.
  • the pusher 48 is formed for example as a plastic part and slidably disposed in an opening 50 of the machine housing 4. In the preferred case, the pusher 48 is also operable in the radial direction 30. He is advantageously clamped pressed together with the bending punch 40. In this way, a locking or unlocking of the protective cover 12 and the drive spindle 6 can be effected by a single handle operation and, consequently, by a single linear displacement of the blocking member 22.
  • the locking device 16 is characterized by a minimum number of components. It is very easy to produce and assemble and susceptible to interference. It essentially comprises a single movable assembly in the form of the pusher 48 and the bending punch part 40, which forms the blocking member 22.
  • FIG. 5 shows in perspective the locking member 22 with attached pusher 48. It can be seen that the locking member 22 is formed by the bending punch 40, wherein the (locking) portion 42 for locking the guard from the plane of the bending punch portion 40 angled 90 °, ie after a punching operation is bent out of the plane, and which with a radially extending portion 30 44th forms the mandrel 36 for engagement with the drive spindle.
  • the bending punch part 40 is held captive in the radial direction on the one hand by the arrangement of the pusher 48 and on the other hand by an annular disc 52 and the spring element 46 supported against it.
  • the locking device 16 is thus actuated by a single linear adjusting movement in the radial direction 30 and is therefore extremely user-friendly.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
EP20080013500 2007-11-21 2008-07-26 Scie circulaire motorisée dotée d'un capot protecteur rotatif Active EP2062699B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200710055650 DE102007055650B3 (de) 2007-11-21 2007-11-21 Motorisch angetriebene Handkreissäge mit verdrehbarer Schutzhaube

Publications (3)

Publication Number Publication Date
EP2062699A2 true EP2062699A2 (fr) 2009-05-27
EP2062699A3 EP2062699A3 (fr) 2010-03-31
EP2062699B1 EP2062699B1 (fr) 2011-03-30

Family

ID=40352206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20080013500 Active EP2062699B1 (fr) 2007-11-21 2008-07-26 Scie circulaire motorisée dotée d'un capot protecteur rotatif

Country Status (2)

Country Link
EP (1) EP2062699B1 (fr)
DE (2) DE102007055650B3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105235017A (zh) * 2015-10-29 2016-01-13 河南理工大学 一种电锯紧急制动控制装置
US10792834B2 (en) 2017-06-05 2020-10-06 Milwaukee Electric Tool Corporation Table saw
US11364652B2 (en) * 2019-09-03 2022-06-21 Makita Corporation Portable cutting machine

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009036797A1 (de) * 2009-08-08 2011-02-10 Metabowerke Gmbh Motorisch angetriebene Handkreissäge
JP6857536B2 (ja) * 2017-04-06 2021-04-14 株式会社やまびこ 携帯型切断機

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4402241A (en) 1981-08-10 1983-09-06 Black & Decker Inc. Spindle locking means for power operated tool
EP1193036A2 (fr) 2000-09-30 2002-04-03 Festool GmbH Machine-outil à main à dispositif de blocage de l'arbre d'outil

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3177909A (en) * 1962-07-27 1965-04-13 Robert A Laube Saw blade guard lock
DE3500372A1 (de) * 1985-01-08 1986-07-10 Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt Element zum arretieren der antriebsspindel fuer das saegeblatt einer handkreissaege
DE3633655A1 (de) * 1986-10-03 1988-04-14 Black & Decker Inc Tragbare kreissaege
US5075976A (en) * 1991-02-05 1991-12-31 Young Peter W Power tool guard retainer
DE4130174C2 (de) * 1991-09-11 1993-11-18 Metabowerke Kg Elektrowerkzeug, insbesondere Tauchkreissäge mit einer Vorrichtung zum Sichern des Werkzeugwechsels
US5782001A (en) * 1996-08-27 1998-07-21 Gray; John W. Circular saw guard hold and release device
DE102007011168B4 (de) * 2007-03-07 2020-07-16 Mafell Ag Handkreissäge
GB0719802D0 (en) * 2007-10-04 2007-11-21 Black & Decker Inc A Power tool

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4402241A (en) 1981-08-10 1983-09-06 Black & Decker Inc. Spindle locking means for power operated tool
EP1193036A2 (fr) 2000-09-30 2002-04-03 Festool GmbH Machine-outil à main à dispositif de blocage de l'arbre d'outil

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105235017A (zh) * 2015-10-29 2016-01-13 河南理工大学 一种电锯紧急制动控制装置
US10792834B2 (en) 2017-06-05 2020-10-06 Milwaukee Electric Tool Corporation Table saw
US11407142B2 (en) 2017-06-05 2022-08-09 Milwaukee Electric Tool Corporation Table saw
US11364652B2 (en) * 2019-09-03 2022-06-21 Makita Corporation Portable cutting machine

Also Published As

Publication number Publication date
DE502008003001D1 (de) 2011-05-12
EP2062699B1 (fr) 2011-03-30
DE102007055650B3 (de) 2009-04-16
EP2062699A3 (fr) 2010-03-31

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