EP2285535B1 - Dispositif électrique doté d'un mécanisme marche-arrêt - Google Patents

Dispositif électrique doté d'un mécanisme marche-arrêt Download PDF

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Publication number
EP2285535B1
EP2285535B1 EP08748475.4A EP08748475A EP2285535B1 EP 2285535 B1 EP2285535 B1 EP 2285535B1 EP 08748475 A EP08748475 A EP 08748475A EP 2285535 B1 EP2285535 B1 EP 2285535B1
Authority
EP
European Patent Office
Prior art keywords
trigger
powered device
pressing surface
mounting surface
unlocked position
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.)
Not-in-force
Application number
EP08748475.4A
Other languages
German (de)
English (en)
Other versions
EP2285535A4 (fr
EP2285535A1 (fr
Inventor
Leijun Li
Peter Stierle
Manfred Lutz
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 EP2285535A1 publication Critical patent/EP2285535A1/fr
Publication of EP2285535A4 publication Critical patent/EP2285535A4/fr
Application granted granted Critical
Publication of EP2285535B1 publication Critical patent/EP2285535B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/02—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch
    • H01H3/20—Operating parts, i.e. for operating driving mechanism by a mechanical force external to the switch wherein an auxiliary movement thereof, or of an attachment thereto, is necessary before the main movement is possible or effective, e.g. for unlatching, for coupling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
    • H01H9/02—Bases, casings, or covers
    • H01H9/06—Casing of switch constituted by a handle serving a purpose other than the actuation of the switch, e.g. by the handle of a vacuum cleaner

Definitions

  • the present invention relates to ON-OFF switches for powered devices, and especially for hand-held electrical devices such as power tools. More particularly, it relates to manual ON-OFF triggers that can be used to activate and/or lock such ON-OFF switches.
  • the accidental engagement of an ON-OFF trigger may present safety risks.
  • U.S. Patent No. 5,638,945 discloses a power switch for an electric hedge trimmer that has a spring which normally biases the trigger from an unlocked ON state into an OFF state.
  • a separate latching member is provided so the user can choose to maintain the trigger in a locked ON state.
  • To engage the latching member a separate movement is necessary. Therefore two distinct movements are required before the trigger can be locked into the ON state and this minimizes the risk of accidentally locking the tool into the ON state. It would be useful to have an ON-OFF mechanism with similar safety measures but which requires no additional latching parts.
  • Another device is known from DE 2 450 577 A1 .
  • a powered device which is, in one embodiment, a hand-held angle grinder.
  • the powered device has an ON-OFF mechanism comprising a housing having a mounting surface, a trigger associated with said mounting surface and having an OFF position, an ON-UNLOCKED position, and an ON-LOCKED position, means for biasing the trigger into the OFF position from the ON-UNLOCKED position.
  • the trigger includes a first pressing surface for manual movement of the trigger from the OFF position against said biasing means to the ON-UNLOCKED position, and a second pressing surface for manual movement of the trigger from the ON-UNLOCKED position to the ON-LOCKED position.
  • the first pressing surface and the second pressing surface are generally adjacent to each other and form a reflex angle.
  • the obtuse angle used in a prior art design makes it possible that the user can engage both surfaces without readjusting the position of the thumb on the trigger button. Since the reflex angle requires readjustment, the powered device is safer and less likely to be accidentally locked into an ON state.
  • two raised guide shoulders extending from the mounting surface can define a path for movement of the trigger provided that it is positioned between these two shoulders.
  • the trigger must first slide along the mounting surface, i.e., an axial movement along the length of the motor housing, in order to move from the OFF position into the ON-UNLOCKED position. Then the trigger needs to be generally rotated relative to the mounting surface. This changes the trigger from the ON-UNLOCKED position into the ON-LOCKED position.
  • the mounting surface is provided with a cavity for cooperating with a protrusion that is an integral part of the trigger for locking the trigger into the ON-LOCKED position.
  • the same biasing means that is used to bias the switch into the OFF position provides the biasing force to retain this protrusion in the cavity.
  • the housing may be provided with two shelves extending from the mounting surface. In the OFF position they can serve as guide surfaces for the sliding of the locking protrusion that extends from the trigger when the trigger is moved into the ON-UNLOCKED position. In addition, they can provide a surface onto which the underside of the trigger can cooperate for locking the trigger in the ON-LOCKED position.
  • the trigger can be conveniently mounted to the motor housing by providing a second cavity in the mounting surface and by providing a second protrusion on the trigger for passing through the cavity and retaining the trigger.
  • a second cavity in the mounting surface and by providing a second protrusion on the trigger for passing through the cavity and retaining the trigger.
  • an inexpensive way is to have one or more protrusions that are flexible so that they can flex into an insertion position and then resiliently return to their original shape to retain the trigger.
  • a third protrusion that can act as a pivot point. It is advantageous if this protrusion has a smooth curved surface so that it can also slide easily along the mounting surface. The positioned lengthwise at a position closer to a center of the second pressing surface than to an interface between the first pressing surface and the second pressing surface. Doing so means there is less leverage for rotating the trigger when pressing the second pressing surface. As such it is less likely to be accidentally rotated than if the third protrusion were placed directly at the interface between the two pressing surfaces or if it were closer to a comparable midpoint of the first pressing surface.
  • the relative proportions are such that pressing in a direction normal to the first pressing surface when the trigger is in the ON-UNLOCKED position will not rotate or slide the trigger. This is makes it less likely that for undesirable movements which may inadvertently turn on the device.
  • the trigger can be retained in the ON-LOCKED position. Therefore it is advantageous that once the user has positioned his thumb or fingers such that he can engage the second pressing surface, additional pressure on the second pressing surface will not cause the trigger to slide or rotate. Therefore, once the contemplated action of turning on the tool is completed, the user must also make a conscious decision in order to turn off the tool.
  • the first pressing surface which is also used for initiating the movement of the switch into the ON-UNLOCKED position can at the same time provide a pressing surface for additional actions, such as for manually moving the trigger from the ON-LOCKED position to the ON-UNLOCKED position.
  • This aspect is advantageously combined with the fact that the biasing force will semi-automatically complete the action of returning the trigger from the ON-UNLOCKED position to the OFF position. Therefore advantageously only a single action is needed to turn the tool off.
  • inventive embodiments herein described can be used for a variety of different powered devices. Although also suitable for stationary devices, they are particularly useful for hand-held devices, and especially for hand-held power tools, such as grinders, saws, rotary tools, etc., since improper handling of these devices may often present safety risks. Certain embodiments are particularly well suited for incorporation into an angle grinder, since safety is a great concern for such devices and a thumb trigger is a customary means used for activating the device.
  • a powered device in this case an angle grinder 10, is shown in Fig. 1 .
  • a motor housing 12 also provides a first operational handle for the user.
  • a second operational handle 14 may also be provided so that a user can accurately guide the working tool 16 driven by the device.
  • a portion of the motor housing 12 is configured with a gently curved but generally flat mounting surface 18 for mounting an ON-OFF trigger button 20 that is coupled with a switch 22 that is used to switch the tool between an ON and an OFF state (see Figs. 6 and 10 ).
  • the motor housing 12 can also act as an operational handle by providing a palm gripping surface 24. The gripping of this surface with the user's palm conveniently positions the hand so that his thumb can manipulate ON-OFF trigger button 20.
  • angle grinder 10 is illustrated for the purpose of describing the structure of certain embodiments of the invention, the invention is not limited in utility to power tools, or to hand-held devices, or even to electrical devices. Any sort of machinery - irrespective of size - having a source of power and an ON-OFF switch may benefit from the invention. A variety of hand-held items not generally considered to be power tools, such as a hair dryers or the like, may also benefit. Pneumatic devices could benefit, in so far as the flow of their source of power (pressurized gas) can be switched on or off to enable the device.
  • the trigger button 20 herein described is separate from and coupled with a distinct switch 22 since this arrangement is often used for economic or design reasons, but it is contemplated that such a trigger may alternatively be an intrinsic part of a switch.
  • a prior art ON-OFF trigger button 20' shown in Fig. 1 will first be described. To facilitate comparison with embodiments of the invention described thereafter, each feature of prior art trigger button 20' will be identified with a prime symbol (i.e., "'"). Certain aspects of the angle grinder 10, motor housing 12 and mounting surface 18 will be described in the context of prior art trigger button 20', but it should be appreciated that an identical mounting surface 18 can be utilized with both prior art trigger button 20' and trigger button 20.
  • trigger button 20' On its top side, trigger button 20' is provided with a first pressing surface 26' and a second pressing surface 28' (see Fig. 2 ).
  • a paired set of symmetrical or asymmetrical flexible retaining arms 30' is present on the underside of trigger button 20'. These flex so that during assembly they can pass through a cavity 32 in the mounting surface 18 of the motor housing 12 but later resiliently return to their original shape so that paired latching protrusions 34' will retain trigger button 20'.
  • a locking protrusion 36' Also on the underside of trigger button 20' is a locking protrusion 36' that cooperates with a second cavity 38 in the mounting surface 18 to retain trigger button 20' in the locked position that will be described below.
  • the underside also provides paired laterally located pivot protrusions 40' which also contribute to this locking mechanism.
  • Trigger button 20 shares these all of these features, including first pressing surface 26, second pressing surface 28, flexible retaining arms 30, latching protrusions 34, locking protrusion 36, and pivot protrusions 40 (see Figs. 3, 4 and 5 ). However, while certain features are shared - and in fact the two trigger buttons 20, 20' can cooperate with the same mounting surface 18 - the arrangement of the features and the way they cooperate is quite different.
  • first pressing surfaces 26, 26' and second pressing surfaces 28, 28' are quite different. Though in neither case are the pressing surfaces perfectly flat, they are generally planar so that one can consider the general angle formed between the two surfaces.
  • the angle 42' is obtuse, that is, between 90 and 180 degrees, and as illustrated is generally about 150 degrees.
  • the angle 42 is generally a reflex angle, that is, greater than 180 degrees, and as illustrated is generally about 205 degrees.
  • the surfaces in each case are adjacent each other, so that there are nevertheless general interfaces 44, 44' between the two pressing surfaces somewhere near the vertex of the angles 42, 42' defined above.
  • the pivot protrusions 40' in the case of prior art trigger button 20' are approximately underneath this interface 44', but the pivot protrusions 40 in trigger button 20 are further away from the interface 44 and are positioned closer to the lengthwise center 46 of second pressing surface 28.
  • retaining arms 30 pass through a cavity 32 in the mounting surface 18 for retaining trigger button 20, but these retaining arms 30 furthermore pass through a switch arm 48 present within motor housing 12 so that these parts are coupled.
  • the top face 50 of each of the paired latching protrusions 34 is angled to accommodate rotation of trigger button 20 since it must nevertheless pass through the switch arm 48.
  • Switch arm 48 cooperates directly with switch 22 and is biased by a compression spring 52 in a direction of arrow 54 so that in the rest position, trigger button 20 is biased into a first "OFF" position as shown in Fig. 7 .
  • Compression spring 52 is positioned between a housing portion 56 and switch arm 48.
  • An extension 58 of switch arm 28 mechanically activates switch 22.
  • Trigger button 20 is positioned between two raised shoulders 60 extending from mounting surface 18. Raised shoulders 60 and mounting surface 18 form a track in which trigger button 20 can slide from the OFF position to the other positions.
  • first pressing surface 26 By preferably manipulating first pressing surface 26, a user can slide trigger button 20 against the biasing force of spring 52 so that trigger button 20 takes on the position shown in Fig. 8 .
  • locking protrusion 36 passes between two guide shelves 62 which are on either side of locking protrusion 36 and the pivot protrusions 40 slide along mounting surface 18. This is the "ON-UNLOCKED" position, since switch arm 48 in this position will enable switch 22.
  • Trigger button 20 is retained in this position due to the force of spring 52 which pulls the locking protrusion 36 against a wall 64 of second cavity 38.
  • the trigger has a partially hollow underside so that an inner wall 66 of the trigger 20 found on this underside is pulled by the force of spring 52 into contact with guide shelves 62. Therefore spring 52 acts as biasing means not only for establishing the OFF position but also for retaining the trigger in the ON-LOCKED position.
  • trigger button 20 This splitting of the movement of trigger button 20 into two phases is realized due to the particular shape of trigger button 20.
  • prior art trigger button 20' works differently. Normally the second pressing surface 28' is engaged for moving from the OFF position to the ON-UNLOCKED position. However, continued pressure on the second pressing surface 28' will also move trigger button 20' further all the way into the ON-LOCKED position.
  • the movement into the ON-LOCKED position does not involve further axial movement of trigger button 20 but instead involves a rotation of trigger button 20 around pivot points created by the pivot protrusions 40 pressing against mounting surface 18.
  • the pivot protrusions 40 have a curved under surface 68 to enable this pivoting while at the same time permit pivot protrusions 40 to slide smoothly along mounting surface 18 when trigger button 20 is moved from the OFF position to the ON-UNLOCKED position.
  • trigger button 20 To release trigger button 20 from the ON-LOCKED position, the user presses with a force normal to first pressing surface 26. This rotates trigger button 20 in the opposite direction with respect to pivot protrusions 40, thereby freeing the locking protrusion 36 from cavity 38 so that the biasing force of spring 52 will "automatically" return trigger button 20 into the OFF position.
  • Prior art button 20' has a similar release mechanism, in so far as pressure on first pressing surface 26' achieves the same effect.
  • ribs 70 are provided on the first pressing surface 26.
  • a concave depression 72 is provided on the second pressing surface 28, and as best seen in Fig. 4 , the first pressing surface 26 also has a bit of a concave curved shape.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Switch Cases, Indication, And Locking (AREA)
  • Push-Button Switches (AREA)

Claims (14)

  1. Dispositif électrique comprenant un mécanisme MARCHE-ARRÊT, comprenant :
    un boîtier (12) ayant une surface de montage (18) ;
    une gâchette (20) associée à ladite surface de montage (18) et présentant une position ARRÊT, une position MARCHE-DÉVERROUILLÉE, et une position MARCHE-VERROUILLÉE, ladite gâchette (20) étant accouplée à un interrupteur (22) qui est utilisé pour commuter le dispositif entre un état MARCHE et un état ARRÊT ;
    un moyen (52) pour solliciter la gâchette dans la position ARRÊT à partir de la position MARCHE-DÉVERROUILLÉE ; ladite gâchette (20) comprenant une première surface de pression (26) pour le déplacement manuel de la gâchette (20) de la position ARRÊT à l'encontre dudit moyen de sollicitation (52) à la position MARCHE-DÉVERROUILLÉE et une deuxième surface de pression (28) pour le déplacement manuel de la gâchette (20) de la position MARCHE-DÉVERROUILLÉE à la position MARCHE-VERROUILLÉE, ceci pouvant être effectué uniquement par pression sur la deuxième surface de pression (28) une fois que la gâchette (20) est dans la position MARCHE-DÉVERROUILLÉE ;
    la première surface de pression (26) et la deuxième surface de pression (28) étant généralement adjacentes l'une à l'autre et formant un angle rentrant (42).
  2. Dispositif électrique selon la revendication 1, caractérisé en ce que le boîtier (12) présente deux épaulements (60) qui s'étendent depuis la surface de montage (18) et la gâchette (20) est positionnée entre les deux épaulements (60).
  3. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la gâchette (20) glisse- le long de la surface de montage (18) lorsque la gâchette (20) est déplacée de la position ARRÊT à la position MARCHE-DÉVERROUILLÉE.
  4. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la gâchette (20) tourne généralement par rapport à ladite surface de montage (18) lorsque la gâchette (20) est déplacée de la position MARCHE-DÉVERROUILLÉE à la position MARCHE-VERROUILLÉE.
  5. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite surface de montage (18) présente une première cavité (38) destinée à coopérer avec une première saillie (36) sur la gâchette (20) de manière à verrouiller la gâchette (20) dans la position MARCHE-VERROUILLÉE.
  6. Dispositif électrique selon la revendication 5, caractérisé en ce que le boîtier (12) présente deux tablettes (62) s'étendant depuis la surface de montage (18), lesquelles sont de part et d'autre de la première saillie (36) lorsque la gâchette (20) est dans la position ARRÊT et coopèrent avec le côté inférieur (66) de la gâchette (20) de manière à verrouiller la gâchette dans la position MARCHE-VERROUILLÉE.
  7. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que ladite surface de montage (18) présente une deuxième cavité (32) pour coopérer avec une deuxième saillie (30) sur la gâchette (20) de manière à retenir la gâchette (20) sur le boîtier (12).
  8. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que la gâchette (20) comprend en outre une troisième saillie (40) qui sert de pivot lorsque la gâchette (20) tourne par rapport à ladite surface de montage (18).
  9. Dispositif électrique selon la revendication 8, caractérisé en ce que la troisième saillie (40) est positionnée en longueur dans une position plus proche d'un centre (46) de la deuxième surface de pression (28) que d'une interface (44) entre la première surface de pression (26) et la deuxième surface de pression (28).
  10. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que, lorsque la gâchette (20) est dans la position MARCHE-DÉVERROUILLÉE, une pression perpendiculairement à la première surface de pression (26) ne fasse pas tourner ou glisser la gâchette (20).
  11. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que, lorsque la gâchette (20) est dans la position ARRÊT, une pression sur la deuxième surface de pression (28) ne fasse pas tourner ou glisser la gâchette (20).
  12. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que, lorsque la gâchette (20) est dans la position MARCHE-VERROUILLÉE, une pression sur la deuxième surface de pression (28) ne fasse pas tourner ou glisser la gâchette (20).
  13. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce qu'une pression perpendiculairement à la première surface de pression (26) peut être utilisée pour déplacer manuellement la gâchette (20) de la position MARCHE-VERROUILLÉE à la position MARCHE-DÉVERROUILLÉE.
  14. Dispositif électrique selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif électrique est une meuleuse d'angle (10).
EP08748475.4A 2008-05-09 2008-05-09 Dispositif électrique doté d'un mécanisme marche-arrêt Not-in-force EP2285535B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2008/000917 WO2009135338A1 (fr) 2008-05-09 2008-05-09 Dispositif électrique doté d'un mécanisme marche-arrêt

Publications (3)

Publication Number Publication Date
EP2285535A1 EP2285535A1 (fr) 2011-02-23
EP2285535A4 EP2285535A4 (fr) 2015-01-28
EP2285535B1 true EP2285535B1 (fr) 2015-10-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP08748475.4A Not-in-force EP2285535B1 (fr) 2008-05-09 2008-05-09 Dispositif électrique doté d'un mécanisme marche-arrêt

Country Status (3)

Country Link
EP (1) EP2285535B1 (fr)
CN (1) CN102015218B (fr)
WO (1) WO2009135338A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104972441A (zh) * 2014-04-11 2015-10-14 罗伯特·博世有限公司 具有开关装置的电动工具机
US11867224B2 (en) 2021-01-27 2024-01-09 Black & Decker Inc. Locking mechanism for two telescoping poles of a power tool
US11931851B2 (en) 2019-10-23 2024-03-19 Black & Decker Inc. Pole sander

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DE102011075196A1 (de) * 2011-05-04 2012-11-08 Robert Bosch Gmbh Werkzeugmaschinenschaltvorrichtung
CN102528163B (zh) * 2012-01-06 2015-01-07 南京德朔实业有限公司 掌型曲线锯
JP5854914B2 (ja) * 2012-04-20 2016-02-09 株式会社マキタ 充電式電動工具
US9954418B2 (en) 2014-03-17 2018-04-24 Makita Corporation Power tool
DE102014213394A1 (de) * 2014-07-10 2016-01-14 Robert Bosch Gmbh Elektrowerkzeugmaschine mit einem Schiebeschalter
JP6874481B2 (ja) * 2017-03-31 2021-05-19 工機ホールディングス株式会社 電動工具
CN107217632A (zh) * 2017-06-06 2017-09-29 浙江亚特电器有限公司 一种操作安全的吹吸机
WO2018228825A1 (fr) * 2017-06-12 2018-12-20 Atlas Copco Industrial Technique Ab Boulonneuse mécanique à entraînement angulaire
JP7147871B2 (ja) 2018-11-30 2022-10-05 工機ホールディングス株式会社 作業機
JP7210261B2 (ja) 2018-12-14 2023-01-23 株式会社マキタ 電動作業機及び電動作業機用モータにおけるステータの製造方法

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DE2450577A1 (de) * 1974-10-24 1976-05-06 Gloria Werke Schulte H Kg Schalter fuer elektro-handwerkzeuge
DE3201744A1 (de) * 1982-01-21 1983-07-28 Karl M. Reich Maschinenfabrik GmbH, 7440 Nürtingen Schaltschieber fuer elektrowerkzeuge
US4592144A (en) * 1984-06-22 1986-06-03 The Singer Company Molded scroller saw lock button spring
US5540291A (en) * 1993-07-23 1996-07-30 Ryobi Outdoor Products Switch actuator for a portable power tool
JPH11277462A (ja) * 1998-03-27 1999-10-12 Makita Corp 電動工具のスイッチ機構
US6805208B2 (en) * 2002-08-02 2004-10-19 Black & Decker Inc. Switch lock-off mechanism for power tools
US6812425B1 (en) * 2003-11-24 2004-11-02 Defond Components Limited Locking trigger switch mechanism
US6989503B2 (en) * 2004-03-22 2006-01-24 Defond Components Limited Power tool trigger assembly

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104972441A (zh) * 2014-04-11 2015-10-14 罗伯特·博世有限公司 具有开关装置的电动工具机
CN104972441B (zh) * 2014-04-11 2019-02-05 罗伯特·博世有限公司 具有开关装置的电动工具机
US11931851B2 (en) 2019-10-23 2024-03-19 Black & Decker Inc. Pole sander
US11867224B2 (en) 2021-01-27 2024-01-09 Black & Decker Inc. Locking mechanism for two telescoping poles of a power tool

Also Published As

Publication number Publication date
EP2285535A4 (fr) 2015-01-28
CN102015218B (zh) 2012-07-11
CN102015218A (zh) 2011-04-13
EP2285535A1 (fr) 2011-02-23
WO2009135338A1 (fr) 2009-11-12

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