EP2230056B1 - Electric chain saw - Google Patents

Electric chain saw Download PDF

Info

Publication number
EP2230056B1
EP2230056B1 EP10155120.8A EP10155120A EP2230056B1 EP 2230056 B1 EP2230056 B1 EP 2230056B1 EP 10155120 A EP10155120 A EP 10155120A EP 2230056 B1 EP2230056 B1 EP 2230056B1
Authority
EP
European Patent Office
Prior art keywords
coupling
brake
casing
chain saw
electric chain
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
EP10155120.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2230056A1 (en
Inventor
Zugen Ni
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.)
Suzhou Kingclean Floorcare Co Ltd
Original Assignee
Suzhou Kingclean Floorcare 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 Suzhou Kingclean Floorcare Co Ltd filed Critical Suzhou Kingclean Floorcare Co Ltd
Publication of EP2230056A1 publication Critical patent/EP2230056A1/en
Application granted granted Critical
Publication of EP2230056B1 publication Critical patent/EP2230056B1/en
Not-in-force 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 an electric chain saw according to the preambles of claims 1 and 6.
  • the electric chain saw is generally provided inside with a brake device.
  • a brake device there is commonly only one brake unit in the brake device in the commercially available electric chain saw. Once this brake unit fails or is damaged, the operator cannot brake it again. Thus, it still fails to improve operation safety of the electric chain saw.
  • the brake device of the prior art electric chain saw brakes a motor commonly via such mechanisms as a clutch, a lever and a gear that are connected with a motor shaft, which is not only slow in braking but also complicated in structure with many parts, disadvantageous for miniaturizing the electric chain saw.
  • a brake device has to be designed in the electric chain saw that can brake during a normal shutdown.
  • the brake device in the prior art electric chain saw only has an emergency braking function, that is, it brakes the motor shaft after forced interruption of the power supply circuit of the motor, and is incapable of braking the motor shaft when the electric chain saw is normally shut down.
  • An electromotive chain saw having a brake drum stopping device is shown in EP 0 761 398 A1 .
  • That chain saw comprises a casing as well as a motor and a brake device installed in the casing.
  • the brake device includes a brake drum sleeved on and revolving together with a motor shaft.
  • the brake strap is sleeved on the brake drum, wherein one end of the brake strap is connected with a first brake unit and the other end is connected with a second brake drum unit.
  • a purpose of the present invention is to provide an electric chain saw, in which is stalled a brake device that not only is simple in structure and quick in braking but also has two brake units, greatly improving operation safety of the electric chain saw.
  • An electric chain saw which includes a casing as well as a motor and the brake device thereof installed in the casing.
  • the brake device includes the following parts:
  • the casing is provided inside with a main power switch serially connected with the motor.
  • the first brake unit includes a first coupling, a first elastic member, a button and a driving member.
  • the first coupling is fixed on the brake strap.
  • the button and the driving member are connected with the casing via a pivot, respectively.
  • the button opposite at one end to a contact on the main power switch, is provided at the other end with a molded main tooth section.
  • the driving member opposite at one end to one end of the first coupling, is provided at the other end with a molded secondary tooth section engaged with the main tooth section.
  • the first elastic member located between the other end of the first coupling and the casing, provides an elastic force that drives the first coupling to move towards one side to tighten the brake strap.
  • the casing is provided inside with a first passage that guides the first coupling to perform rectilinear motion.
  • the first elastic member is a spring, through which goes one end of the brake strap before being fixed on the first coupling via a first fixing pin.
  • the first passage has an end wall on both sides. The spring is propped at one end against the first coupling and at the other end against the end wall on one side of the first passage.
  • the first coupling is provided at one end with a shrinkage pool into which the spring can be propped and at the other end with a molded convex section.
  • This convex section extending out of a pilot hole on the end wall on the other side of the first passage, is opposite to an extension handle molded on the driving member.
  • the casing is provided inside with a protection power switch serially connected with the motor.
  • the second brake unit includes a second coupling, a second elastic member, a connecting rod, a protection plate and a trigger knob.
  • the second coupling is fixed on the brake strap.
  • the protection plate is connected with the casing via the pivot, with one end exposed outside the casing and the other end pin-connected with one end of the connecting rod.
  • the connecting rod is pin-connected at the other end with one end of the second coupling.
  • the second elastic member propped between the other end of the second coupling and the casing, provides an elastic force that drives the second coupling to move towards one side to tighten the brake strap.
  • the trigger knob is connected with the casing via the pivot, with one end opposite to a contact on the protection power switch and the other end controlled by a bulge molded on the protection plate.
  • the casing is further provided inside with a second passage that guides the second coupling to perform rectilinear motion.
  • the second elastic member is further also a spring, through which goes one end of the brake strap before being fixed on the second coupling via a second fixing pin.
  • the second passage has an end wall on both sides. The spring is propped at one end against the second coupling and at the other end against the end wall on one side of the second passage.
  • the second coupling is provided at one end with a shrinkage pool into which the spring can be propped and at the other end with a molded pin-connected handle.
  • the pin-connected handle extending out of a pilot hole on the end wall on the other side of the second passage, is pin-connected with the connecting rod.
  • the first brake unit is fitted and linked with the main power switch, realizing the normal braking function of the electric chain saw.
  • the specific action principle is as below.
  • the second brake unit is fitted and linked with the protection switch, realizing the emergency braking function of the electric chain saw.
  • the specific action principle is as below.
  • the protection plate When the operator uses the electric chain saw normally, the protection plate has to be pulled to an initial position. During this pulling process, the protection plate pushes via the bulge on it against the trigger knob, which then presses the contact on the protection power switch, making the protection power switch turned on. Meanwhile, the protection plate pushes against the second coupling with the help of the connecting rod to overcome the elastic force of the second elastic member, and forces the brake strap to loosen and separate from the brake drum, thus enabling the motor shaft to drive the chain saw blade to revolve normally. Besides, the protection plate has to be always kept at the initial position, so as to keep the protection power switch on and meanwhile provide a persistent force to prevent the second elastic member from being elastically reset.
  • Another purpose of the present invention is to provide an electric chain saw that can be braked normally, in which the brake device brakes the motor shaft via the first brake unit fitted and linked with the main power switch, so as to realize the purpose of braking the electric chain saw under the condition that the electric chain saw is normally powered off, thus filling up a gap that the prior art electric chain saw cannot be braked normally and further ensuring the operator's safety.
  • the special technical solution of this electric chain saw is as below.
  • An electric chain saw is provided that can be braked normally, including a casing and a brake device therein.
  • the casing includes a bare casing and a rear handle integrated with the bare casing.
  • the bare casing is provided inside with a motor.
  • the rear handle is provided inside with a main power switch serially connected with the motor.
  • the brake device includes the following parts:
  • the first brake unit includes the following parts:
  • the above-mentioned electric chain saw that can be braked normally includes a first elastic member, and the first coupling is provided at one end with a first shrinkage pool into which the first elastic member can be propped and at the other end with a molded convex section.
  • An embodiment of the electric chain saw of the present invention includes a casing 1, a motor installed in the casing 1, a chain saw blade (not shown in the drawing) driven by a motor shaft, and a brake device installed in the casing 1.
  • the casing 1 is composed of a bare casing 101 as well as a front handle 102 and a rear handle 103 integrated with the bare casing 101.
  • the rear handle 103 is provided inside with a main power switch 2, and the bare casing 101 with a motor and a protection power switches 3, with the motor, the main power switch 2 and the protection power switch 3 serially connected with each other.
  • the brake device is composed of a brake drum 4, a brake strap 5, a first brake unit arid a second brake unit.
  • the brake drum 4 is sleeved on and revolves together with a motor shaft.
  • the brake strap 5 is sleeved on outer edge of the brake drum 4, with one end connected with a first brake unit that is fitted with the main power switch 2.
  • the brake strap 5 is connected at the other end with the second brake unit, which is fitted with the protection power switch 3.
  • the first brake unit in this embodiment includes a first coupling 6, a first elastic member 7, a button 8 and a driving member 9.
  • the button 8 is connected via a pivot 19 with the rear handle 103, and the driving member 9 via a pivot 20 with the bare casing 101.
  • the button 8, opposite at one end to a contact on the main power switch 2, is provided at the other end with a molded main tooth section 801.
  • the driving member 9, with a molded extension handle 902 at one end, is provided at the other end with a molded secondary tooth section 901 engaged with the main tooth section 801.
  • the first coupling 6 in this embodiment is provided at one end with a first shrinkage pool 601, and at the other end with a molded convex section 602.
  • the first elastic member 7 is a spring, through which goes one end of the brake strap 5 before being fixed on the first coupling 6 via a first fixing pin 17.
  • the bare casing 101 in this embodiment is provided inside with a first passage 10 that guides the first coupling 6 to perform rectilinear motion.
  • the first passage 10 has an end wall on both sides.
  • the spring is propped at one end into the first shrinkage pool 601 on the first coupling 6, and at the other end against the end wall on one side of the first passage 10, thus providing an elastic force that drives the first coupling 6 to move towards one side to tighten the brake strap 5.
  • the convex section 602 on the first coupling 6 can extend out of a pilot hole on the end wall of the other side of the first passage 10, thus opposite to an extension handle 902 molded on the driving member 9.
  • the second brake unit in this embodiment includes a second coupling 11, a second elastic member 12, a connecting rod 13, a protection plate 14 and a trigger knob 15.
  • the protection plate 14 in this embodiment is connected via a pivot 22 with the bare casing 101, with one end exposed outside the bare casing 101 and located in front of the front handle 102 and the other end pin-connected with one end of the connecting rod 13.
  • the trigger knob 15 is connected with the bare casing 101 via a pivot 21, with one end opposite to a contact on the protection power switch 3 and the other end controlled by a bulge 141 molded on the protection plate 14.
  • the second coupling 11 in this embodiment is provided at one end with a second shrinkage pool 111 and at the other end with a molded pin-connected handle 112.
  • the second elastic member 12 in this embodiment is also a spring, through which goes the other end of the brake strap 5 before being fixed on the second coupling 11 via a second fixing pin 18.
  • the bare casing 101 in this embodiment is provided inside with a second passage 16 that guides the second coupling 11 to perform rectilinear motion.
  • the second passage 16 has an end wall on both sides.
  • the spring is propped at one end into the second shrinkage pool 111 on the second coupling 11, and at the other end against the end wall on one side of the second passage 16, thus providing an elastic force that drives the second coupling 11 to move towards one side to tighten the brake strap 5.
  • the pin-connected handle 112 on the second coupling 11, extending out of a pilot hole on the end wall of the other side of the second passage 16, is pin-connected with the other end of the above-mentioned connecting rod 13.
  • the first brake unit in this embodiment is fitted and linked with the main power switch 2, realizing the normal braking function of the electric chain saw. As shown in Figures 1 and 16 , the specific principle is described as below.
  • the second brake unit in this embodiment is fitted and linked with the protection power switch 3, realizing the emergency braking function of the electric chain saw.
  • the protection power switch 3 realizing the emergency braking function of the electric chain saw.
  • the protection plate 14 When the operator uses the electric chain saw normally, the protection plate 14 has to be pulled to an initial position. During this pulling process, the protection plate 14 pushes via the bulge 141 on it against the trigger knob 15, which then presses the contact on the protection power switch 3, making the protection power switch 3 turned on. Meanwhile, the protection plate 14 pushes against the second coupling 11 with the help of the connecting rod 13 to overcome the elastic force of the second elastic member 12, and forces the brake strap 5 to loosen and separate from the brake drum 4, thus enabling the motor shaft to drive the chain saw blade to revolve normally. Besides, the protection plate 14 has to be always kept at the initial position, so as to keep the protection power switch 3 on and meanwhile provide a persistent force to prevent the second elastic member 12 from being elastically reset, as shown in Figure 1 .
  • the brake device in this electric chain saw in this embodiment because of adopting the two brake units, can deal with the normal braking condition and the emergency braking condition, respectively. Besides, when one of the brake units fails, the electric chain saw of the present invention can be braked via the other brake unit, fully satisfying requirements on operation safety of the electric chain saw, greatly ensuring an operator's safety.
  • the two brake units in this embodiment brake the motor all via the brake strap 5 and the brake drum 4, and are meanwhile linked with the main power switch 2 and the protection power switch 3 of the electric chain saw, respectively, truly attaining the purpose of braking immediately after being powered off, characteristic of quick brake, simple operation, and sensitive action.
  • the present invention is simple in the overall structure and less in the part quantity, more advantageous in miniaturization design of the electric chain saw.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
EP10155120.8A 2009-03-17 2010-03-02 Electric chain saw Not-in-force EP2230056B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN2009101151008A CN101590548B (zh) 2009-03-17 2009-03-17 电链锯

Publications (2)

Publication Number Publication Date
EP2230056A1 EP2230056A1 (en) 2010-09-22
EP2230056B1 true EP2230056B1 (en) 2016-02-17

Family

ID=41405538

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10155120.8A Not-in-force EP2230056B1 (en) 2009-03-17 2010-03-02 Electric chain saw

Country Status (2)

Country Link
EP (1) EP2230056B1 (zh)
CN (1) CN101590548B (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2465654B1 (en) * 2010-12-17 2017-07-26 Robert Bosch GmbH Chainsaw
DE102012218072A1 (de) * 2012-10-03 2014-06-12 Hilti Aktiengesellschaft Handgeführtes Werkzeuggerät mit einer Bremsvorrichtung zum Bremsen eines Bearbeitungswerkzeuges
WO2015057117A1 (en) * 2013-10-17 2015-04-23 Husqvarna Ab Chainsaw with removable clutch cover
CN104604548B (zh) * 2013-11-05 2018-06-19 南京德朔实业有限公司 电动园林工具
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
CN103770157B (zh) * 2014-01-10 2016-04-13 浙江亚特电器有限公司 电链锯的刹车结构
CN107999870B (zh) * 2016-10-28 2019-10-18 苏州宝时得电动工具有限公司 电动工具
CN111245312A (zh) * 2018-11-28 2020-06-05 南京德朔实业有限公司 电动工具以及电动工具的控制方法

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3263284B2 (ja) * 1995-09-04 2002-03-04 株式会社マキタ 電動式チェーンソー
US20050210685A1 (en) * 2004-03-24 2005-09-29 Jung-Chang Jong Brake mechanism for tool
CN101528430B (zh) * 2006-10-19 2011-05-11 富世华智诺株式会社 链锯的制动装置及链锯

Also Published As

Publication number Publication date
CN101590548A (zh) 2009-12-02
CN101590548B (zh) 2012-07-18
EP2230056A1 (en) 2010-09-22

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