EP1749626B1 - Mécanisme de frein pour scie à chaîne - Google Patents

Mécanisme de frein pour scie à chaîne Download PDF

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Publication number
EP1749626B1
EP1749626B1 EP06118299.4A EP06118299A EP1749626B1 EP 1749626 B1 EP1749626 B1 EP 1749626B1 EP 06118299 A EP06118299 A EP 06118299A EP 1749626 B1 EP1749626 B1 EP 1749626B1
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EP
European Patent Office
Prior art keywords
kick
spring
switch
chain
pawl
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.)
Active
Application number
EP06118299.4A
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German (de)
English (en)
Other versions
EP1749626A1 (fr
Inventor
Peter Heywood
Andrew Fowles
Gabor Balla
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1749626A1 publication Critical patent/EP1749626A1/fr
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Classifications

    • 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
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/10—Transmission clutches specially designed for chain 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
    • B27B17/00—Chain saws; Equipment therefor
    • B27B17/08—Drives or gearings; Devices for swivelling or tilting the chain saw
    • B27B17/083—Devices for arresting movement of the saw chain

Definitions

  • the present invention relates to improvements in or relating to chain saws.
  • it relates to chain saw switching mechanisms.
  • a chain saw comprises a chain in which each or alternate links are provided with a cutting surface.
  • the chain is carried on a chain bar and rotationally driven around the chain bar by means of an electric motor or a petrol engine rotating a chain sprocket.
  • the chain bar is laterally adjustable with respect to the sprocket to enable adjustment of the tension of the chain.
  • a number of braking systems to arrest the rotation of the chain when power is removed are known. In normal use, current practice is for the chain to stop within around 1 second after switch off of the power to the motor or the engine.
  • 'run-down' brakes include a metal strip wound around and urged by means of spring bias into contact with a brake disc mounted on the driveshaft of the engine or motor.
  • An additional brake a so-called 'kick-back' brake, is required to arrest the movement of the chain when a dangerous condition occurs, particularly those in which the teeth of the chain at the tip of the chainbar become stuck in the object being sawn.
  • continued rotation of the motor or engine causes the chain saw to swing upwards or 'kick back', typically towards the user's face.
  • a kick-back guard or switch positioned immediately forward of the first handgrip contacts the user's hand and is actuated, causing a braking member to act directly or indirectly upon the motor or engine driveshaft.
  • the chain saw body continues to have considerable rotational inertia and could still make contact with the user's face or other part of their body. Accordingly, a kick-back brake is required to stop the movement of the chain much more quickly than a run-down brake, typically in less than 0.15 seconds.
  • US 4 782 593 which forms the preamble to claim 1
  • EP 0 235 670 describe a chain saw wherein the motor drives a hub which is coaxial with a cylindrical portion of the shaft for one sprocket wheel of the chain.
  • a coil spring is wound around the hub and the cylindrical portion to normally transmit torque from the hub to the shaft and to brake the shaft in response to its disengagement from the hub as a result of pivoting of a guard for one hand of the operator. The guard is pivoted by the one hand when the chain saw kicks back.
  • the chain saw is of the type described in our earlier application US2002/0124421 .
  • the chain saw includes a housing 11 in which is housed a prime mover in the form of an electric motor.
  • the housing includes a rear handle 12 in which is mounted a switch 13 to cause actuation of the motor.
  • Rear handle 12 in use, will be held by the user's right hand.
  • the housing also provides a front handle 14 for the user's left hand.
  • the chain saw includes a chain 15 (shown in outline as a dashed and dotted line) carried by an elongate chain bar 16 having a rounded tip 17.
  • an adjustment member 20 provides tensioning by means of a circular tensioning wheel 21 and clamping by means of clamping knob 22.
  • the method of tensioning the chain and clamping the chain bar is immaterial in the context of the present invention.
  • the chain saw has a kick-back brake actuator 23 which, in use, causes actuation of the kick-back brake by contact with the user's left hand or wrist in a kick-back situation.
  • the mechanism 30 includes a chain sprocket 31 which drives a cutting chain carried by a chain bar supported on a chain saw housing (omitted for clarity).
  • Chain sprocket 31 is coupled to an electric motor 32 through a switchable or disengagable one-way directional drive mechanism in the form of a wrap spring clutch assembly 33 working through a drive gear 34 driven by a motor shaft gear 35 carried on the output shaft of the motor.
  • the motor is mounted within a motor housing 40 which also carries a conventional chain lubricating-oil reservoir 41.
  • Wrap spring clutch assembly 33 is shown in more detail in Figures 6 to 8 , in which drive gear 34 is shown schematically.
  • Chain sprocket 31 is mounted on or includes a chain sprocket hub 42.
  • First gear 34 is similarly mounted on or formed with a main gear hub 43.
  • the two hubs are inserted into a helical wrap spring 44. Correct alignment is ensured by means of a central shaft 45 with the whole assembly supported by bearings 46 at each end suitably held within the chain saw housing 11 and motor housing 40.
  • the rotational direction of the motor and the winding of the wrap spring are chosen so that the spring 44 tightens onto the hubs 42,43 during normal operation, thus transmitting the drive. (The number of windings/hub and the spring pre-tension is chosen so this locks and cannot slip).
  • a pawl 51 is pivotally mounted upon the motor housing 40 and located to engage spring stop 50 in the rest condition of the chain saw (as shown most clearly in Figure 2 ). Pawl 51 is biased into this position by means of pawl spring 52 which bears against an internal surface of the chain saw housing (not shown, for clarity). When pawl 51 is in the rest position it acts against spring stop 50 to prevent drive from the motor. Mounting of the pawl on the main housing guarantees secure engagement and reliable operation.
  • a pin (obscured) on the motor side of elongate beam 53 engages an slot 60 formed in pawl 51.
  • Switch 13 of drive mechanism 30 is depressed by the user to cause actuation of the motor 32.
  • Switch 13 moves within the housing 11 and acts upon a first end of an elongate beam 53, typically an injection moulded plastics component, which includes a cantilever spring element 54.
  • a switch upper internal bearing surface 57 ( Figures 5 and 9 ) within the switch bears against beam 53 thereby lifting pawl 51 by means of the beam pin and causing cantilever spring element 54 to bear against a microswitch 55 in turn actuating the motor 32.
  • Figure 9.1 The normal sequence of operation of the chain saw is illustrated in Figures 9.1, 9.2 and 9.3 .
  • Figure 9.1 all components of the drive mechanism 30 are in the rest configuration.
  • Figure 9.2 shows that as switch 13 is lifted (depressed by the user's fingers), beam 53 is lifted and, by means of the beam pin engaging pawl slot 60, pawl 51 is lifted out of engagement with spring stop 50 of the wrap spring 44. Further depression of switch 13 causes cantilever spring to bear against microswitch 55. Power is thus applied to motor 32, rotating motor shaft gear 35 and thus drive gear 34.
  • the pre-tensioning of the spring provides sufficient frictional grip to the spring on main gear hub 43 to closing up of the windings of spring 44 on the main gear hub and thus, as described above, cause rotation of chain sprocket hub 42 and thereby rotation of the chain 15.
  • the switch 13 In normal operation, the switch 13 is released firstly causing the electrical supply to the motor to be cut (returning to the position of Figure 9.2 ). Complete release of the switch 13 causes the beam to drop back into its rest position with the bias of the spring 52 acting on pawl 51. Pawl 51 thereby engages spring stop 50, opening the windings of the spring 44 whereby the motion of the spring is arrested.
  • the motor continues its motion, which opens the spring, allowing slipping between gear hub 42 and spring 44.
  • the chain and sprocket have very much less kinetic energy than the motor. Chain sprocket 31, chain sprocket hub 42 and chain 15 can also continue their motion by unwinding the spring, but are quickly brought to a stop by the pre-tension of the spring.
  • run-down brakes have to work against the inertia remaining in the motor when the power has been disconnected.
  • the wrap spring clutch disengages the physical link between the motor and the chain.
  • the brake only has to work to stop the chain, not the motor. Accordingly, the chain can be stopped more quickly than in some conventional chain saws.
  • There is also less aggressive treatment of the motor as it can be allowed to run down in its own time, resulting in prolonged lifespan for the motor.
  • Figure 9.4 shows that the use of a cantilever spring element 54 allows a degree of overtravel of the switch 13.
  • An alternative switch arrangement can be used in which the switch itself has the required degree of overtravel. Overtravel, it will be appreciated, is desirable as it is preferred that actuation of electric motors occurs at a midpoint in the travel of a switch, rather than only at the end of the switch travel.
  • the chain saw includes a hand guard 23.
  • the guard In normal problem-free use, the guard simply acts as a guard to space the user's left hand from the rapidly rotating chain. However, when contacted hard, for example, during kick back, the guard deflects and actuates the brake.
  • the design of the kick-back switch is generally conventional, comprising a pivotable switch actuator 23 presenting a comparatively large surface area in order to provide a large protective area for the user's hand. The large size also acts to ensure positive actuation in the event of kick-back.
  • Actuator 23 is pivotally mounted at its lower end in a suitable manner in the chain saw housing about a pivot point 61.
  • Kick-back lever 62 Mounted at the pivot point for movement with the actuator 23 is a kick-back lever 62, which engages beam 53 in a kick-back lever engaging element in the form of a pocket 63.
  • Kick-back lever 62 includes a kick-back lever cantilever spring 64 which engages a beam aperture 65 formed in an upper surface of beam 53.
  • actuator 23 is caused to pivot forwardly (as shown) together with kick-back lever 62.
  • Kick-back lever 62 engages kick-back lever pocket 63 of beam 53 pulling it away from the switch 13, out of engagement with switch internal bearing surface 57 and thereby allowing the beam 53 to drop within the switch 13 moulding.
  • power to the motor is cut and, as the beam pin engages pawl slot 60, so pawl 51 drops, thereby engaging spring stop 50 of the wrap spring 44 and disconnecting any residual rotational inertia in the motor from driving the cutting chain 15. Accordingly, wrap spring 44 brakes the chain in the same manner as described above with respect to the run-down operation.
  • Figure 9.6 shows a situation, after actuation of the kick-back mechanism, where a user has reset the kick-back actuator 23 without first releasing the main rear switch 13.
  • beam 53 bears against a switch edge internal bearing surface 58 preventing return of the beam 53 to its rest position. Only once the rear switch has been released can beam 53 return to its rest position above the switch upper internal bearing surface 57 by virtue of the action of kick-back lever cantilever spring 64 against the beam aperture 65.
  • switch upper and edge internal bearing surfaces are formed by an internal switch wall 66.
  • a particular aspect of the construction of the chain saw is the relative proportions of kick-back lever 62 and kick-back switch actuator or guard 23, such that the guard rotates through a large angle on kick-back. This is especially beneficial as it makes it clear to the user that the kick-back has operated. With lesser angles of rotation this is not always apparent, with consequent frustration to the user who is unable to understand why the saw will not operate. Rotational angles in the range of 20 to 45° are preferred, more preferably around 30°.
  • the present invention provides a simple chain saw switching mechanism providing substantial advantages over the prior art.
  • a simple beam provides an interlink between the switching functions and provides that the chain saw will not switch back on after the kick-back switch has been activated until the main switch has been released and reapplied.
  • the pawl pivotally mounted, with spring assistance, on the main structure of the chain saw provides reliable engagement and operation.
  • the use of spring element 54 which need not be an integral part of the beam, accommodates over-travel of the linkage relative to the microswitch and the kick-back lever spring 64 also allows over-travel of the kick-back linkage itself relative to the beam.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Claims (4)

  1. Scie à chaîne (10) comprenant une chaîne de coupe (15) supportée sur une barre de chaîne (16) et entraînée au moyen d'une roue dentée de chaîne (31) entraînée en rotation par un appareil moteur par le biais d'un ensemble d'embrayage à ressort (33) et ayant un moyen de freinage de rebond fourni par l'ensemble d'embrayage à ressort ; dans lequel :
    l'ensemble d'embrayage à ressort agit de plus pour fournir une fonction de freinage de décélération ;
    la roue dentée de chaîne (31) est montée sur un moyeu de roue dentée de chaîne (42) et l'ensemble d'embrayage à ressort (33) comprend un engrenage (34) monté sur un moyeu d'engrenage (43), les moyeux (42, 43) étant montés dans une configuration opposée dans un ressort hélicoïdal (44) qui inclut une butée de ressort (50) ;
    la scie à chaîne (10) comprenant en outre cliquet (51) amené en engagement avec la butée de ressort (50) prévue sur le ressort hélicoïdal (44) grâce à quoi, dans la position engagée, une rotation du ressort (44) est substantiellement empêchée, dans laquelle le cliquet (51) est rétractable à partir dudit engagement avec la butée de ressort (50) lors de l'actionnement d'un commutateur d'opérateur (13) ; et
    le commutateur d'opérateur (13) est monté de manière mobile à une extrémité dans un boîtier de poignée (12) de la scie à chaîne (10) et destiné à agir sur une première extrémité d'une poutre allongée (53), laquelle poutre (53) inclut un moyen d'actionnement de cliquet destiné à désengager le cliquet (51) par rapport à la butée de ressort (50) en réponse à un actionnement du commutateur d'opérateur (13) ;
    caractérisée en ce que le commutateur d'opérateur (13) inclut des surfaces d'appui de commutateur supérieure et interne d'arête (66), dans laquelle un engagement de la poutre (53) avec la surface d'appui de commutateur interne supérieure est requis pour l'actionnement de l'appareil moteur, et dans laquelle, lors de l'actionnement du commutateur d'actionneur de rebond (23), un contact de la poutre (53) avec la surface d'appui de commutateur interne supérieure est interrompu ou sinon empêché, de sorte que l'appareil moteur ne puisse pas être de nouveau actionné jusqu'à ce que le commutateur d'opérateur (13) n'ait été relâché et réappliqué.
  2. Scie à chaîne selon la revendication 1 dans lequel le moyen de freinage de rebond inclut un commutateur d'actionneur de freinage de rebond pivotant (23) et un moyen d'actionnement de freinage de rebond (62) destiné à provoquer un engagement du cliquet (51) avec la butée de ressort (50) en réponse à l'actionnement du commutateur d'actionneur de freinage de rebond (23).
  3. Scie à chaîne selon la revendication 2 dans lequel le moyen d'actionnement de freinage de rebond comprend un levier de rebond (62) destiné à un mouvement de pivotement avec le commutateur d'actionneur de freinage de rebond (23) et dans laquelle une réservation de levier de rebond (63) est prévue dans la poutre (53) dans laquelle le levier de rebond est situé, de sorte que, lors d'un actionnement du commutateur d'actionneur de freinage de rebond (23), le levier de rebond (62) est sollicité contre une surface de la réservation de levier de rebond (63) de la poutre (53), en amenant de cette manière le cliquet (51) à engager de nouveau la butée de ressort (50) de l'ensemble d'embrayage à ressort (33).
  4. Scie à chaîne selon la revendication 1, 2 ou 3 dans laquelle le moyen d'actionnement de cliquet comprend une goupille prévue sur un côté de la poutre allongée (53) qui s'engage avec une fente (60) formée dans le cliquet.
EP06118299.4A 2005-08-02 2006-08-02 Mécanisme de frein pour scie à chaîne Active EP1749626B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB0515884A GB0515884D0 (en) 2005-08-02 2005-08-02 Improvements in or relating to chainsaws

Publications (2)

Publication Number Publication Date
EP1749626A1 EP1749626A1 (fr) 2007-02-07
EP1749626B1 true EP1749626B1 (fr) 2016-10-12

Family

ID=34983948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06118299.4A Active EP1749626B1 (fr) 2005-08-02 2006-08-02 Mécanisme de frein pour scie à chaîne

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EP (1) EP1749626B1 (fr)
CN (1) CN1907613B (fr)
GB (1) GB0515884D0 (fr)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2451139A (en) * 2007-07-20 2009-01-21 Husqvarna Uk Ltd Wrap spring clutch and fan arrangement in a chainsaw
EP2286970A1 (fr) 2009-08-18 2011-02-23 Robert Bosch GmbH Machine outil et procédé de retour d'informations à l'utilsateur
CN102741024B (zh) * 2010-02-11 2016-01-20 胡斯华纳有限公司 具有无刷电机的电池驱动的电动工具
DE102010030918A1 (de) 2010-07-05 2012-01-05 Robert Bosch Gmbh Handwerkzeugmaschinenbremsbetätigungsvorrichtung
CN202088251U (zh) * 2010-08-27 2011-12-28 泉峰(中国)贸易有限公司 链锯
EP2465654B1 (fr) 2010-12-17 2017-07-26 Robert Bosch GmbH Scie à chaîne
CN102398078B (zh) * 2011-10-25 2013-12-18 浙江亚特电器有限公司 链锯机械刹车结构
WO2013122518A1 (fr) * 2012-02-15 2013-08-22 Husqvarna Ab Ensemble frein pour dispositif de coupe à main entraîné par une énergie
CN103535202B (zh) * 2012-07-12 2015-09-09 苏州宝时得电动工具有限公司 植物修剪机
DE102012015814B4 (de) * 2012-08-10 2014-12-11 Mogatec Moderne Gartentechnik Gmbh Motorkettensäge mit einer Schlingfederkupplung und einer Reibungsbremse
EP2770105A1 (fr) 2013-02-20 2014-08-27 Schoeller Technocell GmbH & Co. KG Papier de base pour matériaux de revêtement décoratifs
CN103770158B (zh) * 2014-01-10 2016-05-11 浙江亚特电器有限公司 一种电链锯的刹车结构
EP3337648B1 (fr) * 2015-08-18 2021-11-17 Black & Decker Inc. Systeme d'embrayage de guide de chaine pour une tronçonneuse, systeme d'embrayage de serrage de guide de chaine pour une tronçonneuse et procede de positionnement d'un guide de chaine sur une tronçonneuse
CN110637626B8 (zh) * 2019-11-06 2024-08-20 南京厨优堂科技有限公司 一种夹持式油锯
WO2022051468A1 (fr) 2020-09-04 2022-03-10 Milwaukee Electric Tool Corporation Scie à chaîne
US20230356427A1 (en) * 2022-05-03 2023-11-09 Milwaukee Electric Tool Corporation Chainsaw sharpening features and devices

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3607376A1 (de) * 1986-03-06 1987-09-10 Metabowerke Kg Tragbare motorkettensaege mit einer reibungsbremse zum abbremsen der saegekette
JP3263280B2 (ja) * 1995-05-16 2002-03-04 株式会社マキタ 電動式チェーンソーのチェーン停止装置
JP3263284B2 (ja) * 1995-09-04 2002-03-04 株式会社マキタ 電動式チェーンソー
DE19931251A1 (de) 1999-07-07 2001-01-11 Bosch Gmbh Robert Motorkettensäge
DE19963650A1 (de) 1999-12-29 2001-07-12 Bosch Gmbh Robert Kettensäge
CN2609700Y (zh) * 2003-03-21 2004-04-07 黄源 电链锯刹车装置

Also Published As

Publication number Publication date
EP1749626A1 (fr) 2007-02-07
GB0515884D0 (en) 2005-09-07
CN1907613B (zh) 2011-05-04
CN1907613A (zh) 2007-02-07

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