EP2621680A1 - Outil motorisé à système de verrouillage - Google Patents

Outil motorisé à système de verrouillage

Info

Publication number
EP2621680A1
EP2621680A1 EP10857654.7A EP10857654A EP2621680A1 EP 2621680 A1 EP2621680 A1 EP 2621680A1 EP 10857654 A EP10857654 A EP 10857654A EP 2621680 A1 EP2621680 A1 EP 2621680A1
Authority
EP
European Patent Office
Prior art keywords
spindle
lock
power tool
spindle lock
trigger
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Withdrawn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
EP10857654.7A
Other languages
German (de)
English (en)
Other versions
EP2621680A4 (fr
Inventor
Jizhong Fu
Jiahao Fan
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.)
Bosch Power Tools China Co Ltd
Original Assignee
Bosch Power Tools China Co 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 Bosch Power Tools China Co Ltd filed Critical Bosch Power Tools China Co Ltd
Publication of EP2621680A1 publication Critical patent/EP2621680A1/fr
Publication of EP2621680A4 publication Critical patent/EP2621680A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/001—Gearings, speed selectors, clutches or the like specially adapted for rotary 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
    • B24B23/022—Spindle-locking devices, e.g. for mounting or removing the tool

Definitions

  • the invention relates to a power tool having an interlock system for preventing the power tool from being switched on and being locked at the same time.
  • a typical power tool has an electrical motor and a tool bit driven by the rotational spindle of the motor via a transmission mechanism which converts the rotational movement of the spindle to the movement required by the tool bit.
  • the motor is switched on/off by an operator by means of a switch trigger.
  • the spindle of the motor should be locked from rotation for the purpose of, for example, exchanging the tool bit, or the like.
  • some conventional power tools are equipped spindle locks for locking their spindles in place from rotation.
  • an interlock system for preventing its spindle lock and switch trigger from being operated at the same time is believed to be a good option.
  • an object of the invention is to provide a power tool having a simple and reliable interlock system for protecting the power tool from being switched on and being locked at the same time.
  • the present invention provides a power tool comprising:
  • a motor mounted in the housing and having a rotary spindle
  • a trigger configured for switching on/off the motor
  • a spindle lock configured to be actuated to move in a first radial direction to lock the spindle and a second opposite radial direction to release the spindle;
  • the spindle lock has a positioning member which cooperates with a stop portion of the support member so that:
  • the positioning member is blocked by the stop portion to prevent the spindle lock from being moved in the first axial direction and thus prevent the trigger from being switched on, and
  • the positioning member is blocked by the stop portion to prevent the spindle lock from being moved in the first radial direction to lock the spindle.
  • the power tool further comprises a nut fixed to the spindle, wherein when the spindle lock moves in the first radial direction, it comes into contact with the nut and thus locks the spindle.
  • the power tool further comprises a fan fixed to the spindle by the nut.
  • the power tool further comprises a brake pad fixed to the spindle, such as by being attached to the fan, and a frictional material attached to the spindle lock;
  • the power tool further comprises a first returning member, such as a spring, biasing the spindle lock in the second radial direction and a second returning member, such as a spring, biasing the spindle lock in the second axial direction.
  • a first returning member such as a spring
  • a second returning member such as a spring
  • the power tool further comprises a pushing rod arranged between the trigger and the spindle lock;
  • pushing rod and the trigger each have a cam surface
  • the pushing rod when the trigger is switched on, the pushing rod is moved by means of the camming action between the cam surfaces of the pushing rod and the trigger and thus pushes the spindle lock to move in the first axial direction.
  • the positioning member of the spindle lock has a radial positioning surface and an axial positioning surface
  • the stop portion of the support member has a radial stop surface and an axial stop surface
  • the radial positioning surface faces directly to and is blocked by the radial stop surface to prevent the spindle lock from being moved in the first axial direction
  • the axial positioning surface faces directly to and is blocked by the axial stop surface to prevent the spindle lock from being moved in the first radial direction
  • the support member is a guard of the power tool.
  • the power tool of the invention is preferably a portable power tool.
  • the invention provides a power tool having a new safety system, i.e., an interlock system between its spindle lock and switch trigger.
  • the interlock system has a simple structure to avoid locking the spindle when tool is operating and avoid switching on the tool when the spindle is locked, and thus improves safety condition for both the power tool and its operators.
  • Figure 1 is a schematic cross-sectional view of a power tool according to an embodiment of the invention, showing a stand-by state of the power tool;
  • Figure 2 is a schematic cross-sectional view of the power tool of Figure 1, showing a state that the power tool is turned on and the spindle lock cannot be activated
  • Figure 3 is a schematic cross-sectional view of the power tool of Figure 1, showing a state that the spindle lock is activated and the power tool cannot be turned on;
  • Figure 4 is a cross-sectional side view of the spindle lock of the power tool of Figure 1;
  • Figure 5 is a schematic view showing the relation of the spindle lock and the lock nut of the power tool taken in an A- A direction in Figure 1 ;
  • Figure 6 is a schematic view showing the relation of the spindle lock and the stationary support member of the power tool taken in a B-B direction in Figure 1;
  • Figure 7 to 9 are enlarged schematic views showing the positional relations of the pushing rod, the spindle lock and the support member of the power tool corresponding to the states of Figures 1 to 3 respectively;
  • FIGS. 10 and 11 are partly sectional views showing variations of the spindle lock. Detailed Description of Preferred Embodiments
  • the power tool mainly comprises a housing (not shown), a motor 2 fixedly mounted in the housing and having a rotary spindle 4 which defines a rotational axis Z, a fan 6 fixedly mounted around the rotary spindle 4 by a nut 8 so as to be rotated by the spindle for cooling the motor, a stationary support member (for example, a guard) 10 fixed to or integrally formed with the housing, for carrying a bearing 12 which rotatably supports the spindle 4 near the tip end of the spindle 4; a pinion 14 formed on or mounted to the tip end of the spindle, as a member of a transmission mechanism for converting the rotational movement of the spindle 4 to a rotational, liner or other movement required by a tool bit (not shown, such as a saw blade, a grinding wheel, a drill bit, or the like); a trigger 20 configured to be operated by an operator for switching on/off the motor 2; and a spindle lock 40 for locking the spindle
  • the spindle lock 40 is moveable in radial directions Rl and R2, which are opposite to each other, in Figure 1 to lock and release the spindle 4 respectively. Further, the spindle lock 40 is also moveable in axial directions Tl and T2, which are opposite to each other, to block and allow the spindle lock 40 moving in the radial direction Rl respectively, as described below.
  • the spindle lock 40 is a single piece member formed of a sheet metal by punching and bending.
  • the spindle lock 40 has a central ring portion 41 mounted in normal state around the nut 8 between the fan 6 and the support member 10.
  • the central ring portion 41 may have any shape, such as the circular shape in the illustrated example, a rectangular shape, an elliptical shape, or the like.
  • An elongated actuation portion 42 extends radially from the outer periphery of the central ring portion 41 in the radial direction R2 and terminates with a bent actuation end 43 which can be pushed by an operator.
  • a protrusion (positioning member) 44 is protruded from actuation portion 42 at a position between the actuation end 43 and the outer periphery of the central ring portion 41 towards the support member 10 so as to be restrained by an stop portion 12 of the support member 10.
  • the protrusion 44 is formed by punching out a part of the actuation portion 42.
  • the protrusion 44 can be formed by any manner.
  • it may be a separate member and is fixed to the actuation portion 42 by welding, screw fastening, or the like.
  • the protrusion 44 may be a straight flap extending parallel to the axis Z, like that shown in Figures 1 to 6.
  • the protrusion 44 may have varied shapes, such as that shown in Figures 10 and 11, only if it protrudes towards the stop portion 12 of the support member 10 and provides two positioning surfaces to be restrained by corresponding stopping surfaces of the stop portion 12, i.e., a first (radial) positioning surface 44a extending in a plane perpendicular to the axis Z and facing towards the support member 10 so as to be restrained by a first (radial) stopping surface 12a of the stop portion 12 which extends also in a plane perpendicular to the axis Z and faces towards the spindle lock 40, and a second (axial) positioning surface 44b extending in an inwardly facing plane parallel to the axis Z so as to be restrained by a second (axial) stopping surface 12b of the stop portion 12 which extends in an outwardly facing plane parallel to the axis Z.
  • Figure 7 corresponding to the state shown in Figure 1 for details.
  • the spindle lock 40 further has a locking portion 45 formed on the inner periphery of the ring portion 41 at a position corresponding to the actuation portion 42 and protruded in a radial direction opposite to the actuation portion 42 towards the nut 8. By engaging the locking portion 45 with a flat surface portion of the nut 8, the spindle 4 will be locked from rotating.
  • the spindle lock 40 further has a biased portion 46 which is also protruded towards the support member 10 as the protrusion 44 but much longer than the protrusion 44.
  • the biased portion 46 is formed from a position on the inner periphery of the ring portion 41 diametrically opposed to the locking portion 45.
  • the biased portion 46 may be formed at any suitable position along the extension line of the actuation portion 42 or even form on the actuation portion 42.
  • the biased portion 46 inserts into a recess 60 formed in the support member 10 and is biased by a spring (first returning member) 62 mounted in the recess 60 in the radial direction R2.
  • the biased portion 46 is biased by the spring 62 against an inner wall portion of the recess 60.
  • the spindle lock 40 will move in the radial direction Rl against the spring 62, so that the locking portion 45 engages the nut 8 to lock the spindle 4.
  • the spring 62 will force the spindle lock 40 back in the radial direction R2 so that the locking portion 45 leaves the nut 8 to unlock the spindle 4.
  • the spindle lock 40 locks the spindle 4 according to the operator's actuation to it and automatically unlocks the spindle 4 when the operator's actuation releases.
  • the spindle lock 40 is combined with a brake assembly.
  • the brake assembly comprises a circular brake pad 16 attached to the back surface of the fan 6 (the surface facing away from the main body of the motor 2) and a frictional material 18 attached to a brake portion 48 of the spindle lock 40.
  • the brake portion 48 may be formed at any position around the outer periphery of the ring portion 41, and may be formed at more than one position.
  • the movement of the spindle lock 40 moves in the directions Tl and T2 are achieved by the trigger 20 and a spring (second returning member) 72 respectively.
  • the trigger 20 moves the spindle lock 40 in the axial direction Tl by means of a pushing rod 90 which is arranged at a side of the spindle lock 40 which is opposite to the support member 10.
  • the trigger 20 has a cam surface 22.
  • the pushing rod 90 has a front end 90a which biases against the actuation portion 42 (or one or more of other portions of the spindle lock 40), a middle portion 90b guided by a guiding portion 76 formed on the housing, and a back end 90c having a cam surface 90d cooperative with the cam surface 22 of the trigger 20 so that, when the trigger 20 moves in direction SI, the camming action created by the cam surfaces 22 and 90d results in that the pushing rod 90 moves in the axial direction Tl, and thus the spindle lock 40 is driven by the front end 90a of the pushing rod 90 to move in the axial direction Tl.
  • the spring 72 is mounted in the recess 70 formed in the support member 10 at a position facing the spindle lock 40 (in the illustrated example, at a position facing the actuation portion 42; however, the recess 70 can be formed at one or more positions facing other portions of the spindle lock 40).
  • the spring 72 pushes the spindle lock 40 in the axial direction T2 back to its original position.
  • the moving directions SI and S2 may be any directions that perpendicular to the axis Z.
  • the trigger 20 can be moved in the direction SI by an operator to switch on the power tool. When the operator wants to end the operation of the power tool, he may release the trigger 20 to allow it to move in the direction S2.
  • the trigger 20 may move in the direction S2 by the camming action between the cam surfaces 22 and 90d.
  • a returning member such as a spring, not shown
  • a returning member such as a spring, not shown
  • the back end 90c of the pushing rod 90 may have a larger diameter than the middle portion 90b, so that when the back end 90c contacts and is blocked by the guiding portion 76, the pushing rod 90 and thus the spindle lock 40 cannot be moved in the axial direction Tl anymore.
  • a guiding structure 78 may be formed or mounted at one or more positions of the support member 10.
  • the spindle lock 40 is biased by springs 62 and 72 so as to be located in its radial and axial home positions. Now the spindle lock 40 is able to be moved both in the radial direction Rl by an operator pushing on the actuation end 43 and in the axial direction Tl by the operator switching on the trigger 20 in the direction SI.
  • the protrusion 44 of the spindle lock 40 is positioned with respect to the stop portion 12 of the support member 10 in a condition that its first and second positioning surfaces 44a and 44b near but unaligned with the first and second stopping surfaces 12a and 12b of the stop portion 12 respectively.
  • the power tool is turned on by an operator moving the trigger 20 in the direction SI.
  • the camming action created by the cam surfaces 22 and 90d results in that the pushing rod 90 moves in the axial direction Tl, and thus the spindle lock 40 is driven by the pushing rod 90 to move in the axial direction Tl .
  • the second positioning surface 44b of the protrusion 44 of the spindle lock 40 is aligned to or directly faces to the second stopping surface 12b of the stop portion 12.
  • the operator keeps the switching on state of the trigger 20, as is understood by those skilled in the art.
  • the trigger 20, the spindle lock 40 and the support member 10 form an interlock system to prevent the spindle lock 40 from being moved in both radial and axial directions at the same time.
  • the power tool according to the invention is equipped with a simple and reliable interlock system for protecting the power tool from being switched on and being locked at the same time.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Portable Power Tools In General (AREA)

Abstract

Un outil motorisé comprend un carter, un moteur (2) monté dans le carter et comportant une broche rotative (4), une manette (20) conçue pour allumer/éteindre le moteur (2), un organe de soutien (10) fixé au carter, et un organe de verrouillage (40) de broche conçu pour être actionné afin de se déplacer dans une première direction radiale (R1) pour verrouiller la broche (4) et dans une seconde direction radiale opposée (R2) pour libérer la broche (4). Lorsque la manette (20) est activée, elle déplace l'organe de verrouillage (40) de broche dans une première direction axiale (T1), et lorsque la manette (20) est désactivée, l'organe de verrouillage (40) de broche est autorisé à se déplacer dans une seconde direction axiale opposée (T2). L'organe de verrouillage (40) de broche comporte un élément de positionnement (44) qui coopère avec une partie butée (12) de l'organe de soutien (10) afin d'empêcher l'activation et le verrouillage simultanés de l'outil motorisé.
EP10857654.7A 2010-09-27 2010-09-27 Outil motorisé à système de verrouillage Withdrawn EP2621680A4 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2010/077356 WO2012040891A1 (fr) 2010-09-27 2010-09-27 Outil motorisé à système de verrouillage

Publications (2)

Publication Number Publication Date
EP2621680A1 true EP2621680A1 (fr) 2013-08-07
EP2621680A4 EP2621680A4 (fr) 2018-03-28

Family

ID=45891791

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10857654.7A Withdrawn EP2621680A4 (fr) 2010-09-27 2010-09-27 Outil motorisé à système de verrouillage

Country Status (2)

Country Link
EP (1) EP2621680A4 (fr)
WO (1) WO2012040891A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6519354B2 (ja) * 2015-06-30 2019-05-29 工機ホールディングス株式会社 動力工具
DE102015224006A1 (de) * 2015-12-02 2017-06-08 Robert Bosch Gmbh Handwerkzeugmaschine mit mindestens einem maschinenseitigem Kontaktelement
WO2018001284A1 (fr) * 2016-06-28 2018-01-04 苏州宝时得电动工具有限公司 Ponceuse, son procédé de fonctionnement et procédé de montage et de démontage de plaque de base de travail
JP7049145B6 (ja) * 2018-03-16 2022-04-19 株式会社マキタ 電動工具

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4305967C2 (de) * 1993-02-26 1997-03-06 Kress Elektrik Gmbh & Co Schaltvorrichtung zur Spindelarretierung für Elektrowerkzeuge
GB2327054A (en) * 1997-07-08 1999-01-13 Black & Decker Inc Shaft locking
US6350087B1 (en) * 2000-07-07 2002-02-26 Black & Decker Inc. Tool-free collet tightener
US7980325B2 (en) * 2004-01-16 2011-07-19 Credo Technology Corporation Rotating shaft locking mechanism
DE102005037530B4 (de) * 2005-08-09 2008-08-28 Gison Machinery Co., Ltd. Schleifgerät
CN101204804B (zh) * 2006-12-21 2011-09-07 苏州宝时得电动工具有限公司 动力工具

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2012040891A1 *

Also Published As

Publication number Publication date
EP2621680A4 (fr) 2018-03-28
WO2012040891A1 (fr) 2012-04-05

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