EP1749626A1 - Verbesserungen an oder bei Kettensägen - Google Patents

Verbesserungen an oder bei Kettensägen Download PDF

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Publication number
EP1749626A1
EP1749626A1 EP06118299A EP06118299A EP1749626A1 EP 1749626 A1 EP1749626 A1 EP 1749626A1 EP 06118299 A EP06118299 A EP 06118299A EP 06118299 A EP06118299 A EP 06118299A EP 1749626 A1 EP1749626 A1 EP 1749626A1
Authority
EP
European Patent Office
Prior art keywords
kick
chain
spring
chain saw
switch
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
EP06118299A
Other languages
English (en)
French (fr)
Other versions
EP1749626B1 (de
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
Original Assignee
Robert Bosch GmbH
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP1749626A1 publication Critical patent/EP1749626A1/de
Application granted granted Critical
Publication of EP1749626B1 publication Critical patent/EP1749626B1/de
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
    • 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 and 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 present invention provides a chain saw comprising a run-down brake function and a kick-back brake function, wherein the kick-back brake function is provided by a switchable or disengagable one-way directional drive assembly, characterised in that the one-way directional drive assembly also acts to provide the run-down brake function.
  • the switchable or disengagable one-way directional drive has a low activation force switching assembly. More suitably, the drive is a free-wheel or clutch arrangement.
  • free-wheel arrangement many variations are known to the skilled person and are applicable to the present invention, including clamping free wheels, sprag clutch freewheels, roller freewheels, pawl freewheels, toothed freewheels, friction freewheels, clamping element freewheels, and wedging, clamping or trapped roller freewheels.
  • the clutch arrangement is a wrap-spring clutch assembly.
  • a chain saw in which a cutting chain is carried on a chain bar and driven by means of a chain sprocket rotated by a prime mover through a wrap spring clutch assembly.
  • the wrap-spring clutch assembly comprises a chain sprocket mounted upon a chain sprocket hub and a gear mounted on a gear hub, the hubs being mounted in an opposed configuration within a helical spring which includes a spring stop or tang.
  • the chain saw further comprises a pawl biased into engagement with the spring tang provided on the spring whereby, in the engaged position, rotation of the spring is substantially prevented, which pawl is retractable from said engagement with the spring stop under operation of a operator switch.
  • the chain saw further comprises kick-back brake means including a pivotable kick-back brake actuator switch and kick-back brake actuating means adapted to cause engagement of the pawl with the spring stop in response to operation of the kick-back brake actuator switch.
  • the operator switch is movably mounted at one end within a handle housing of the chain saw and acts upon a first end of an elongate beam, which beam includes pawl actuation means adapted to disengage the pawl from the spring stop in response to operation of the operator switch.
  • the pawl actuation means comprises a pin provided on a side of the elongate beam which engages a slot formed in the pawl.
  • the kick-back brake actuator switch includes a kick-back lever adapted for pivotable movement with the kick-back brake actuator switch.
  • a kick-back lever engaging element such as a pocket, is provided in the beam into which the kick-back lever is located, such that, upon actuation of the kick-back brake actuator switch, the kick-back lever is urged against a surface of the kick-back lever pocket of the beam, thereby causing the pawl to re-engage the spring stop of the wrap spring clutch.
  • the operator switch includes upper and edge internal switch bearing surfaces, wherein engagement of the beam with the upper internal switch bearing surface is required for actuation of the prime mover, and wherein, upon actuation of the kick-back actuator switch, contact of the beam with the upper internal switch bearing surface is interrupted or otherwise prevented.
  • the present invention provides a chain-saw having a drive assembly which is disengaged in either a kick-back or a run-down event situation. This is achieved with a low activation energy disengagement clutch or freewheel mechanism.
  • 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 shows that as switch 13 is lifted (depressed by the user's fmgers), 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.
  • 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 of the present invention 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 be 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)
EP06118299.4A 2005-08-02 2006-08-02 Kettensägenbremsanordnung Active EP1749626B1 (de)

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 true EP1749626A1 (de) 2007-02-07
EP1749626B1 EP1749626B1 (de) 2016-10-12

Family

ID=34983948

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06118299.4A Active EP1749626B1 (de) 2005-08-02 2006-08-02 Kettensägenbremsanordnung

Country Status (3)

Country Link
EP (1) EP1749626B1 (de)
CN (1) CN1907613B (de)
GB (1) GB0515884D0 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2017045A2 (de) * 2007-07-20 2009-01-21 Husqvarna UK Limited Kettensäge
EP2286970A1 (de) 2009-08-18 2011-02-23 Robert Bosch GmbH Werkzeugmaschine und Verfahren zur Gewinnung von Benutzerfeedback
DE102010030918A1 (de) 2010-07-05 2012-01-05 Robert Bosch Gmbh Handwerkzeugmaschinenbremsbetätigungsvorrichtung
EP2465654A1 (de) 2010-12-17 2012-06-20 Robert Bosch GmbH Kettensäge
WO2013122518A1 (en) * 2012-02-15 2013-08-22 Husqvarna Ab Brake assembly for power-driven hand-held cutting device
DE102012015814A1 (de) * 2012-08-10 2014-05-15 Mogatec Moderne Gartentechnik Gmbh Motorkettensäge mit einer Schlingfederkupplung und einer Reibungsbremse
EP2770105A1 (de) 2013-02-20 2014-08-27 Schoeller Technocell GmbH & Co. KG Basispapier für dekorative Beschichtungswerkstoffe
WO2017028202A1 (en) * 2015-08-18 2017-02-23 Black & Decker Inc. Low profile chainsaw
EP2533955B1 (de) * 2010-02-11 2017-03-29 Husqvarna AB Kraftbetriebenes handwerkzeug mit einem bürstenlosen motor und batterie
CN110637626A (zh) * 2019-11-06 2020-01-03 台州陆霸机电科技有限公司 一种夹持式油锯
EP4272918A1 (de) * 2022-05-03 2023-11-08 Milwaukee Electric Tool Corporation Kettensäge mit einer antriebskupplung die eine neutralstellung aufweist in der die kette frei bewegbar ist
US12064894B2 (en) 2020-09-04 2024-08-20 Milwaukee Electric Tool Corporation Chainsaw

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN202088253U (zh) * 2010-08-27 2011-12-28 泉峰(中国)贸易有限公司 链锯
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
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
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

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235670A2 (de) 1986-03-06 1987-09-09 Metabowerke GmbH & Co. Tragbare Motorkettensäge mit einer Reibungsbremse zum Abbremsen der Sägekette
EP1066933A2 (de) 1999-07-07 2001-01-10 Robert Bosch Gmbh Motorkettesäge mit einer Kettenbremseinrichtung
US20020124421A1 (en) 1999-12-29 2002-09-12 Christian Hermes Chain saw

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN2609700Y (zh) * 2003-03-21 2004-04-07 黄源 电链锯刹车装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0235670A2 (de) 1986-03-06 1987-09-09 Metabowerke GmbH & Co. Tragbare Motorkettensäge mit einer Reibungsbremse zum Abbremsen der Sägekette
US4782593A (en) 1986-03-06 1988-11-08 Metabowerke Gmbh & Co. Chain saw with a stopping device
EP1066933A2 (de) 1999-07-07 2001-01-10 Robert Bosch Gmbh Motorkettesäge mit einer Kettenbremseinrichtung
US20020124421A1 (en) 1999-12-29 2002-09-12 Christian Hermes Chain saw

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2017045A2 (de) * 2007-07-20 2009-01-21 Husqvarna UK Limited Kettensäge
GB2451139A (en) * 2007-07-20 2009-01-21 Husqvarna Uk Ltd Wrap spring clutch and fan arrangement in a chainsaw
EP2017045A3 (de) * 2007-07-20 2010-12-29 Husqvarna UK Limited Kettensäge
EP2286970A1 (de) 2009-08-18 2011-02-23 Robert Bosch GmbH Werkzeugmaschine und Verfahren zur Gewinnung von Benutzerfeedback
EP2533955B1 (de) * 2010-02-11 2017-03-29 Husqvarna AB Kraftbetriebenes handwerkzeug mit einem bürstenlosen motor und batterie
DE102010030918A1 (de) 2010-07-05 2012-01-05 Robert Bosch Gmbh Handwerkzeugmaschinenbremsbetätigungsvorrichtung
EP2404722A1 (de) 2010-07-05 2012-01-11 Robert Bosch GmbH Handwerkzeugmaschinenbremsbetätigungsvorrichtung
CN102310233A (zh) * 2010-07-05 2012-01-11 罗伯特·博世有限公司 手持式工具机制动操作装置
EP2465654A1 (de) 2010-12-17 2012-06-20 Robert Bosch GmbH Kettensäge
CN102554971A (zh) * 2010-12-17 2012-07-11 罗伯特·博世有限公司 链锯
CN102554971B (zh) * 2010-12-17 2016-01-13 罗伯特·博世有限公司 链锯
US8747281B2 (en) 2012-02-15 2014-06-10 Husqvarna Ab Brake assembly for power-driven hand-held cutting device
WO2013122518A1 (en) * 2012-02-15 2013-08-22 Husqvarna Ab Brake assembly for power-driven hand-held cutting device
CN103648737A (zh) * 2012-02-15 2014-03-19 胡斯华纳有限公司 用于动力驱动手持切割装置的制动组件
CN103648737B (zh) * 2012-02-15 2016-07-06 胡斯华纳有限公司 用于动力驱动手持切割装置的制动组件
DE102012015814B4 (de) * 2012-08-10 2014-12-11 Mogatec Moderne Gartentechnik Gmbh Motorkettensäge mit einer Schlingfederkupplung und einer Reibungsbremse
DE102012015814A1 (de) * 2012-08-10 2014-05-15 Mogatec Moderne Gartentechnik Gmbh Motorkettensäge mit einer Schlingfederkupplung und einer Reibungsbremse
EP2770105A1 (de) 2013-02-20 2014-08-27 Schoeller Technocell GmbH & Co. KG Basispapier für dekorative Beschichtungswerkstoffe
WO2014128030A1 (de) 2013-02-20 2014-08-28 Schoeller Technocell Gmbh & Co. Kg Basispapier für dekorative beschichtungswerkstoffe
WO2017028202A1 (en) * 2015-08-18 2017-02-23 Black & Decker Inc. Low profile chainsaw
CN108025454A (zh) * 2015-08-18 2018-05-11 布莱克和戴克公司 小外形链锯
US10882206B2 (en) 2015-08-18 2021-01-05 Black & Decker, Inc. Low profile chainsaw
CN110637626A (zh) * 2019-11-06 2020-01-03 台州陆霸机电科技有限公司 一种夹持式油锯
CN110637626B (zh) * 2019-11-06 2024-05-10 南京市厨优堂科技有限公司 一种夹持式油锯
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
US12064894B2 (en) 2020-09-04 2024-08-20 Milwaukee Electric Tool Corporation Chainsaw
EP4272918A1 (de) * 2022-05-03 2023-11-08 Milwaukee Electric Tool Corporation Kettensäge mit einer antriebskupplung die eine neutralstellung aufweist in der die kette frei bewegbar ist

Also Published As

Publication number Publication date
CN1907613B (zh) 2011-05-04
EP1749626B1 (de) 2016-10-12
CN1907613A (zh) 2007-02-07
GB0515884D0 (en) 2005-09-07

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