EP1772237A1 - Scie à chaîne - Google Patents

Scie à chaîne Download PDF

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Publication number
EP1772237A1
EP1772237A1 EP06020720A EP06020720A EP1772237A1 EP 1772237 A1 EP1772237 A1 EP 1772237A1 EP 06020720 A EP06020720 A EP 06020720A EP 06020720 A EP06020720 A EP 06020720A EP 1772237 A1 EP1772237 A1 EP 1772237A1
Authority
EP
European Patent Office
Prior art keywords
centrifugal clutch
spindle
cam
sprocket
motor
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
EP06020720A
Other languages
German (de)
English (en)
Other versions
EP1772237B1 (fr
Inventor
Masaki Kondo
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.)
Makita Corp
Original Assignee
Makita Corp
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 Makita Corp filed Critical Makita Corp
Publication of EP1772237A1 publication Critical patent/EP1772237A1/fr
Application granted granted Critical
Publication of EP1772237B1 publication Critical patent/EP1772237B1/fr
Expired - Fee Related 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
    • 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

Definitions

  • the present invention relates to a chain saw of a type that a housing incorporating a motor is provided with a guide bar, and cutting of an object is performed by rotating a chain along the guide bar.
  • a chain saw is so constructed that in a housing provided with a motor which is actuated by operating a trigger to activate, a spindle adapted to rotate by the actuation of the motor is laterally mounted, a sprocket adapted to rotate with the rotation of the spindle and a flat guide bar projecting forward are provided in a side part of the housing, and a chain is stretched between the sprocket and the guide bar. Accordingly, by rotating the chain along a circumferential edge of the guide bar with the rotation of the sprocket, it will be possible to cut an object, such as a log.
  • Japanese Patent Publication No. 2004-314452A discloses a clutch mechanism in which a first cam is integrally provided on the sprocket, while a second cam which can be meshed with the first cam is provided on the spindle so as to be separately rotated and urged toward the first cam.
  • a guide groove including an inclined part and a circumferential locking part is provided on an outer peripheral face of the spindle, while a connecting groove in an axial direction is provided on an inner peripheral face of the second cam, so that steel ball is fitted between both the grooves.
  • the second cam when the spindle starts to rotate, the second cam will be moved forward by a rotation difference between the spindle and the second cam, thereby to be engaged with the first cam, and when the spindle is braked by the electric brake, the second cam will be moved backward by a rotation difference caused by delay of the spindle with respect to the second cam, thereby to release connection with the first cam, when it has arrived at the locking part. Accordingly, the braking time of the chain can be shortened, as compared with the braking time by the electric brake only.
  • a chain saw comprising:
  • Cam teeth may be provided on opposing faces of the cam and the centrifugal clutch, and adapted to be meshed with each other when the centrifugal clutch is moved toward the cam.
  • Each of the cam teeth may be formed with a slant face configured such that the cam teeth are pushed away from each other when the rotation speed difference is generated at the moment of deactivation of the motor.
  • a chain saw 1 is so constructed that a motor 3 is contained in a housing 2 so as to be directed forward (In these figures, the right side is designated as a forward side), in front of its output shaft 4, a spindle 7 is rotatably supported by ball bearings 5, 6 in a lateral direction perpendicular to the output shaft 4, and bevel gears 8, 9 respectively fixed to the output shaft 4 and the spindle 7 are meshed with each other, whereby rotation of the output shaft 4 can be transmitted to the spindle 7.
  • An end of the spindle 7 at an opposite side to the bevel gear 9 passes through the housing 2 to be projected sideward.
  • a cylindrical cam 11 having a flange 12 at a side close to the ball bearing 6 is mounted over a projecting end 10 of the spindle 7 so as to separately rotate, and a sprocket 13 is fixed to the cam 11 perpendicularly so as to rotate integrally therewith.
  • a flat guide bar 15 is fixed to a side face of the housing 2 by a securing bolt 14 in a manner of projecting forward, and an endless chain 16 is stretched between the sprocket 13 and a circumferential edge of the guide bar 15. Therefore, when the sprocket 13 rotates, the chain 16 will rotate along a groove 17 which is formed on the circumferential edge of the guide bar 15.
  • a disc-shaped centrifugal clutch 18 having a larger diameter than the flange 12 of the cam 11 is mounted over the spindle 7 between the cam 11 and the ball bearing 6 coaxially with the spindle 7, and so as to extend perpendicularly to the spindle 7.
  • This centrifugal clutch 18 has a known shape that three weight members 19 which are interconnected in a circumferential direction by three connecting springs 20 so as to move in a radial direction are provided on its outer circumference, whereby the centrifugal clutch 18 is urged in a direction to be contracted.
  • a bowl-shaped connecting body 21 is fitted to the cam 11 between the flange 12 and the sprocket 13 so as to rotate integrally with the cam 11.
  • the connecting body 21 has a slightly larger inner diameter than an outer diameter of the centrifugal clutch 18 at an opened end, and covers the centrifugal clutch 18 in a non-contact manner while the motor 3 is stopped.
  • Denoted by numeral 22 is a washer which is clamped and fixed between the flange 12 and the connecting body 21.
  • Three connecting grooves 23 which extend in an axial direction and open toward the ball bearing 6 are formed on an inner peripheral face of the centrifugal clutch 18 at three equidistant positions in the circumferential direction.
  • three guide grooves 24 which are inclined at a predetermined lead angle from an axis of the spindle 7 are formed on an outer peripheral face of the spindle 7 similarly at three equidistant positions in the circumferential direction.
  • Steel balls 25 are respectively held between the connecting grooves 23 and the guide grooves 24. Accordingly, the centrifugal clutch 18 can move back and forth with respect to the spindle 7 in the axial direction thereof, within a range in which the steel balls 25 roll in the guide grooves 24, and can also rotate integrally with the spindle 7.
  • a coil spring 26 is provided between the washer 22 and the centrifugal clutch 18, so that the centrifugal clutch 18 is urged to a position in Fig. 2A, where the steel balls 25 are positioned at backward ends (as for the spindle 7 and the centrifugal clutch 18, a side of the projected end 10 of the spindle 7 is designated as a forward side) of the guide grooves 24, while the motor 3 is stopped.
  • cam teeth 27 having the same shape are formed on respective faces of the flange 12 of the cam 11 and the centrifugal clutch 18 opposed to each other.
  • the centrifugal clutch 18 in a retreated position where it is urged by the coil spring 26, as described above, to be separated from the flange 12 of the cam 11, and the weight members 19 of the centrifugal clutch 18 are also in a contracted position where they are not in contact with the connecting body 21.
  • the trigger will be operated to deactivate the motor 3. Then, rotation speed of the centrifugal clutch 18 together with the spindle 7 will be lowered thereby to decrease the centrifugal force to be exerted on the weight members 19. Consequently, the weight members 19 will move in a direction to be contracted by the urging force of the connecting springs 20, and will be separated from the connecting body 21 thereby to interrupt transmission of the rotation to the cam 11 by way of the connecting body 21.
  • the centrifugal clutch 18 will be urged by the coil spring 26 to retreat, while the steel balls 25 roll backward along the guide grooves 24 as shown in Fig. 2B, so that the cam teeth 27 will be released from the mesh with each other thereby to return to the position as shown in Fig. 2A.
  • cam teeth 27 of the cam 11 and the centrifugal clutch 18 are provided with the steep slanted faces 29 which press the mating cam teeth 27 away from each other, when the cam teeth 27 have come into contact with the mating cam teeth 27 due to the rotation difference between the cam 11 and the centrifugal clutch 18. Therefore, separation of the cam 11 from the centrifugal clutch 18 when the power supply to the motor 3 is stopped will be reliably performed, and reliability of the clutch operation will be enhanced.
  • the guide grooves 24 and the connecting grooves 23 are respectively formed on the outer peripheral face of the spindle 7 and on the inner peripheral face of the centrifugal clutch 18.
  • semispherical projections may be provided on either one of the inner peripheral face of the centrifugal clutch 18 and the outer peripheral face of the spindle 7, and the projections may be engaged with the guide grooves in the other, thereby to guide the centrifugal clutch 18.
  • a disc spring or a leaf spring may be employed instead of the coil spring 26 pushing the centrifugal clutch 18 backward. Further, such a spring member may be arranged so as to pull the centrifugal clutch 18 backward.
  • the cam 11 is mounted over the projected end of the spindle 7.
  • a rotary shaft of a cam may be provided separately from the spindle 7 and rotatably supported, so that the cam and the centrifugal clutch 18 may be coaxially opposed to each other without interposing the spindle 7.
  • the slanted faces of the cam teeth 27, which press each other in the separating direction when the clutch 18 is operated, may be provided on the cam teeth of either one of the cam 11 and the centrifugal clutch 18. It is of course possible to appropriately decrease the number of the cam teeth, and to change the shape of the cam teeth. As shown in Figs. 5A to 5C, vertical faces 30 extending in the axial direction may be provided in place of the steep slanted faces 29.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • One-Way And Automatic Clutches, And Combinations Of Different Clutches (AREA)
EP20060020720 2005-10-07 2006-10-02 Scie à chaîne Expired - Fee Related EP1772237B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2005295321A JP4801961B2 (ja) 2005-10-07 2005-10-07 チェーンソー

Publications (2)

Publication Number Publication Date
EP1772237A1 true EP1772237A1 (fr) 2007-04-11
EP1772237B1 EP1772237B1 (fr) 2008-12-10

Family

ID=37594383

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20060020720 Expired - Fee Related EP1772237B1 (fr) 2005-10-07 2006-10-02 Scie à chaîne

Country Status (4)

Country Link
EP (1) EP1772237B1 (fr)
JP (1) JP4801961B2 (fr)
CN (1) CN100387409C (fr)
DE (1) DE602006004130D1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4272918A1 (fr) * 2022-05-03 2023-11-08 Milwaukee Electric Tool Corporation Scie à chaîne avec un accouplement d'entraînement ayant un état neutre dans lequel la chaîne est librement mobile

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5910858B2 (ja) * 2012-01-16 2016-04-27 日立工機株式会社 チェンソー
WO2014142722A1 (fr) * 2013-03-15 2014-09-18 Husqvarna Ab Scie à chaîne comprenant ensemble de molette auto-verrouillant
CN107414184B (zh) * 2017-08-28 2023-06-13 浙江动一新能源动力科技股份有限公司 一种链锯的链条板压紧结构及链锯
RU2750205C1 (ru) * 2020-10-28 2021-06-24 Федеральное государственное бюджетное образовательное учреждение высшего образования «Брянский государственный инженерно-технологический университет» Рабочий орган переносной моторной пилы
RU2770694C1 (ru) * 2021-02-24 2022-04-21 федеральное государственное бюджетное образовательное учреждение высшего образования "Брянский государственный инженерно-технологический университет" Рабочий орган переносной моторной пилы

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761398A1 (fr) * 1995-09-04 1997-03-12 Makita Corporation Dispositif combiné pour arrêter la chaîne de sciage et le tambour de frein pour une scie à chaîne

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4197640A (en) * 1978-09-18 1980-04-15 Beaird-Poulan Division, Emerson Electric Co. Safety braking apparatus for portable chain saw
JPS57175705U (fr) * 1981-05-01 1982-11-06
JPS6255744U (fr) * 1985-09-27 1987-04-07
JPH08336809A (ja) * 1995-04-11 1996-12-24 Makita Corp チェーンソーのブレーキ装置
FR2733932B1 (fr) * 1995-05-11 1999-01-22 Stihl Maschf Andreas Tronconneuse a chaine a moteur equipee d'un dispositif de freinage de la chaine
DE10001511A1 (de) * 2000-01-15 2001-07-19 Stihl Maschf Andreas Arbeitsgerät mit Fliehkraftkupplung
JP4505193B2 (ja) * 2003-04-16 2010-07-21 株式会社マキタ チェーンソー
CN2631719Y (zh) * 2003-07-26 2004-08-11 浙江铁鎯电动工具有限公司 电链锯刹车止动装置
CN2698539Y (zh) * 2004-05-17 2005-05-11 长春神箭电动工具有限责任公司 一种电链锯

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761398A1 (fr) * 1995-09-04 1997-03-12 Makita Corporation Dispositif combiné pour arrêter la chaîne de sciage et le tambour de frein pour une scie à chaîne

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP4272918A1 (fr) * 2022-05-03 2023-11-08 Milwaukee Electric Tool Corporation Scie à chaîne avec un accouplement d'entraînement ayant un état neutre dans lequel la chaîne est librement mobile

Also Published As

Publication number Publication date
JP2007098913A (ja) 2007-04-19
CN100387409C (zh) 2008-05-14
EP1772237B1 (fr) 2008-12-10
DE602006004130D1 (de) 2009-01-22
CN1944006A (zh) 2007-04-11
JP4801961B2 (ja) 2011-10-26

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