EP2465654B1 - Kettensäge - Google Patents

Kettensäge Download PDF

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Publication number
EP2465654B1
EP2465654B1 EP10195647.2A EP10195647A EP2465654B1 EP 2465654 B1 EP2465654 B1 EP 2465654B1 EP 10195647 A EP10195647 A EP 10195647A EP 2465654 B1 EP2465654 B1 EP 2465654B1
Authority
EP
European Patent Office
Prior art keywords
chainsaw
motor
kick
chain
battery
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
EP10195647.2A
Other languages
English (en)
French (fr)
Other versions
EP2465654A1 (de
Inventor
Chris Jordan
Andreas Friese
Peter Heywood
Andy Barber
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
Priority to EP10195647.2A priority Critical patent/EP2465654B1/de
Priority to CN201110422366.4A priority patent/CN102554971B/zh
Publication of EP2465654A1 publication Critical patent/EP2465654A1/de
Application granted granted Critical
Publication of EP2465654B1 publication Critical patent/EP2465654B1/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
    • B27B17/083—Devices for arresting movement of the saw chain

Definitions

  • the present invention relates to improvements in or relating to chainsaws.
  • it relates to chainsaw braking mechanisms.
  • Such a chainsaw is known from US5994860 , which discloses the preamble of claim 1.
  • a chainsaw 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 to require 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
  • 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 chain bar become stuck in the object being sawn.
  • continued rotation of the motor or engine causes the chainsaw 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 chainsaw 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 actuation.
  • An example of such a system is disclosed in our earlier patent application, GB 2413525 to which further reference should be made.
  • US 4680862 discloses electrical braking of a chainsaw by reversing the polarity of one pole coil of the field winding of a serial motor and short circuiting it with the rotor winding.
  • US 5994860 describes a modification to this in which the coils of the field winding are each subdivided into serial part-windings.
  • the present provides a chainsaw comprising a chain carried by a chain bar and driven by means of an electric motor and including a run-down brake function and a kick-back brake function; characterised in that the electric motor is an electronically commutated electric motor having at least three coil windings, and at least one of the run-down and kick-back brake functions is provided by means of a control system comprising a brake switch associated with said run-down and kick-back brake and adapted to disconnect a driving voltage from each of said motor coil windings except at least one of them and apply a controlled resistive connection across the each of said motor coil windings.
  • the at least one of said run-down and kick-brake functions is at least the kick-back brake function.
  • the motor has three coil windings and the control means applies a controlled resistive connection across the windings.
  • the motor drives the chain in a direct, gearless, construction.
  • the construction of a chainsaw is well-known and will not be described in detail here. The reader is referred to Figure 3 and to our earlier application US2002/0124421 .
  • the chainsaw includes a housing formed of two housing mouldings 30, 31 and additional cover elements as required.
  • the housing houses a prime mover in the form of an electric motor.
  • the housing includes a rear handle 32 in which is mounted lock-off switch assembly 33 to cause actuation of the motor in response to operation of electrical switch 12.
  • Rear handle will, in use, be typically held by the user's right hand and mounted to the housing is a front handle 34 for the user's left hand.
  • the chainsaw includes a chain 35 carried by an elongate chain bar 36 having a rounded tip. Correct tensioning of the chain is achieved by means of an adjustment member 40 adjusted by means of a circular tensioning wheel 41 with clamping to retain it in position by means of clamping knob 42. Other methods of tensioning the chain and clamping the chain bar are well known.
  • the chainsaw also includes a lubricating system including a lubricant reservoir 46 to ensure that the rapidly moving chain remains adequately lubricated.
  • the chainsaw has a kick-back actuator 43 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 chainsaw uses an electronically-commutated (EC) fan-cooled motor (10) to provide sufficient speed and torque to enable direct drive of the chain, without the need for equivalent gears.
  • the chainsaw comprises a control system 44 including a programmed control microprocessor (not shown) located on a PCB (11) which provides the means to manipulate the open-framed motor to soft start, increase available current when under high loads and electronically brake the motor and thus arrest movement of the chain under kickback and run down conditions.
  • the control system further comprises a user accountable on/off switch (12), a battery connector (13) and a kick-back brake switch (14).
  • the motor armature component 52 uses a surface-mounted eight-pole high-performance magnet construction.
  • the motor field component includes three coil windings (20) ( Figure 2 ) each with an associated Hall Effect sensor. These provide a position signal to the microprocessor which is therefore able to control the current on the coils to deliver the required rotation at optimal efficiency, as is known for such motors. Additionally the same PCB is connected to a detachable battery pack (45) in the case of a cordless product. In preferred embodiments using Li-ion cells, the PCB additionally receives a temperature monitoring signal and is therefore also able to provide the necessary protection for the cells to avoid over temperature, over-current or over-discharge. The PCB also is connected to a simple low current switch (12) as the primary on/off signal. In normal running when this switch is opened the motor and chain are allowed to decelerate freely.
  • the rapid stop kick back brake activated by contact with the front hand guard actuates a high current capacity double change-over rocker switch (14) which disconnects the incoming coil driving voltage 15 ( Figure 2 ) from two of the three motor coils and introduces a controlled resistive connection through braking resistors (21) directly across all three of them, as shown in Fig. 2 .
  • the motor coils are enabled to provide a very rapid regenerative braking effect.
  • the resistance value is selected to provide an upper limit to the regenerative current whilst ensuring the consequent braking performance stops the motor and the chain rapidly, typically in 0.15 seconds or less. This provides a very simple, low wear and high reliability brake construction, using one double-pole changeover switch only.
  • the motor field and armature components may be located directly into the housing mouldings as shown in Figure 3 so saving the complexity and weight of motor end support brackets. This is a further particular advantage of the present invention.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Claims (8)

  1. Kettensäge, die ein Kettensägengehäuse umfasst, das Gehäuseformkomponenten umfasst, wobei die Kettensäge ferner eine Kette umfasst, die durch eine Kettenstange getragen und mittels eines Elektromotors (10) angetrieben wird und eine Nachlaufbremsfunktion und eine Rückschlagbremsfunktion enthält; dadurch gekennzeichnet, dass der Elektromotor (10) ein elektronisch kommutierter Elektromotor (10) ist, der mindestens drei Spulenwicklungen (20) aufweist, und die Nachlaufbremsfunktion und/oder die Rückschlagbremsfunktion mittels eines Kettensägensteuersystems 44 bereitgestellt werden, das einen Bremsschalter (14) umfasst, der der Nachlaufbremse und der Rückschlagbremse zugeordnet ist und ausgelegt ist, von jeder der Motorspulenwicklungen (20) mit Ausnahme mindestens einer davon eine Antriebsspannung zu trennen und über die getrennten Motorspulenwicklungen eine gesteuerte Widerstandsverbindung anzulegen.
  2. Kettensäge nach Anspruch 1, wobei die Nachlauffunktion und/oder die Rückschlagfunktion mindestens die Rückschlagfunktion ist.
  3. Kettensäge nach Anspruch 1 oder Anspruch 2, wobei der Motor drei Spulenwicklungen (20) aufweist und das Steuermittel über jede der Wicklungen eine gesteuerte Widerstandsverbindung anlegt.
  4. Kettensäge nach einem der vorhergehenden Ansprüche, wobei der Motor die Kette in einer direkten, getriebelosen Konstruktion antreibt.
  5. Kettensäge nach einem der vorhergehenden Ansprüche, wobei die Feld- und Ankerkomponenten des Motors (10) direkt auf mindestens einer der Gehäuseformkomponenten angebracht sind.
  6. Kettensäge nach einem der vorhergehenden Ansprüche, wobei der Motor (10) eine Motorwelle aufweist und die Motorwelle einen Axiallüfter trägt.
  7. Kettensäge nach Anspruch 6, wobei die Kettensägensteuerschaltung innerhalb des Kettensägengehäuses derart angebracht ist, dass er Axiallüfter im Gebrauch auf die Steuerschaltung einen Kühlluftstrom aufbringt.
  8. Kettensäge nach einem der vorhergehenden Ansprüche, die ferner eine Batterieeinheit umfasst, die eine wiederaufladbare Batterie, um dem Elektromotor (10) Leistung zuzuführen, umfasst, wobei die Batterieeinheit eine Batteriesteuerschaltung enthält, um das Aufladen und Entladen der Batterie zu steuern, und die Batteriesteuerschaltung innerhalb der Kettensägensteuerschaltung vorgesehen ist.
EP10195647.2A 2010-12-17 2010-12-17 Kettensäge Active EP2465654B1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP10195647.2A EP2465654B1 (de) 2010-12-17 2010-12-17 Kettensäge
CN201110422366.4A CN102554971B (zh) 2010-12-17 2011-12-16 链锯

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP10195647.2A EP2465654B1 (de) 2010-12-17 2010-12-17 Kettensäge

Publications (2)

Publication Number Publication Date
EP2465654A1 EP2465654A1 (de) 2012-06-20
EP2465654B1 true EP2465654B1 (de) 2017-07-26

Family

ID=43844629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10195647.2A Active EP2465654B1 (de) 2010-12-17 2010-12-17 Kettensäge

Country Status (2)

Country Link
EP (1) EP2465654B1 (de)
CN (1) CN102554971B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12064894B2 (en) 2020-09-04 2024-08-20 Milwaukee Electric Tool Corporation Chainsaw

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102972216A (zh) * 2012-12-03 2013-03-20 常州格力博有限公司 无刷链锯
US11278297B2 (en) 2017-08-17 2022-03-22 Stryker Corporation Handheld surgical instrument and method for supplying tactile feedback to a user during a kickback event

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4583291A (en) * 1984-06-01 1986-04-22 Mcculloch Corporation Electric chain saw speed reduction device
DE3530685C5 (de) * 1985-08-28 2005-07-21 Fa. Andreas Stihl Elektrische Motorkettensäge
JP3263284B2 (ja) * 1995-09-04 2002-03-04 株式会社マキタ 電動式チェーンソー
DE19546546A1 (de) * 1995-12-13 1997-06-19 Dolmar Gmbh Reihenschlußmotor mit elektrischer Bremse
DE19963650A1 (de) 1999-12-29 2001-07-12 Bosch Gmbh Robert Kettensäge
DE102004020421B4 (de) 2004-04-27 2016-01-28 Robert Bosch Gmbh Motorkettensäge mit Rückschlag-Bremse und Auslauf-Bremse
GB0515884D0 (en) 2005-08-02 2005-09-07 Bosch Gmbh Robert Improvements in or relating to chainsaws
US20070240892A1 (en) * 2005-11-04 2007-10-18 Black & Decker Inc. Cordless outdoor power tool system
DE102009012181A1 (de) * 2009-02-27 2010-09-02 Andreas Stihl Ag & Co. Kg Akkubetriebenes, handgeführtes Arbeitsgerät mit einem Gashebel
CN101590548B (zh) * 2009-03-17 2012-07-18 苏州金莱克精密机械有限公司 电链锯

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12064894B2 (en) 2020-09-04 2024-08-20 Milwaukee Electric Tool Corporation Chainsaw

Also Published As

Publication number Publication date
CN102554971A (zh) 2012-07-11
EP2465654A1 (de) 2012-06-20
CN102554971B (zh) 2016-01-13

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