EP1817144B1 - Chain saw brake arrangement - Google Patents
Chain saw brake arrangement Download PDFInfo
- Publication number
- EP1817144B1 EP1817144B1 EP05792433.4A EP05792433A EP1817144B1 EP 1817144 B1 EP1817144 B1 EP 1817144B1 EP 05792433 A EP05792433 A EP 05792433A EP 1817144 B1 EP1817144 B1 EP 1817144B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- brake
- chain saw
- saw according
- slider
- lever
- 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
Links
Images
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
- This invention relates to a motor chain saw with a chain brake arrangement comprising a kick brake and a coasting brake that via a link arm mechanism are acting on a brake lever that is pivotally arranged on a shaft directly or indirectly fixed to a chain saw base structure, said brake lever being connected to a brake band acting on a brake drum which is drivingly connected with the outlet shaft of the motor.
- Chain saws of the type mentioned above are previously known, see for instance US 5813123 A1 and US 5480009 :
- the known devices are usually complicated, expensive and difficult to assemble.
- the purpose of this invention is to achieve a braking arrangement that is compact and built into the motor such that the braking arrangement takes little space when assembled into the chain. Moreover the arrangement is simple and reliable and well suited for its purpose.
- Fig. 1 is a front view showing the brake arrangement in its disengaged state whereas Fig. 2 and 3 is a plan view and a rear view of the brake in the position shown in Fig.1
- Fig 4 is a front view of the arrangement when the brake is activated by the coasting brake
- Fig. 5 and 6 is the corresponding plan view and rear view
- Fig. 7 is a front view of the arrangement when it has been activated by the kick brake
- Fig. 8 and 9 is the corresponding plan view and rear view.
- a chain saw is in a conventional way provided with an electric motor 10 that rotates an outlet shaft 11 that via a transmission and a sprocket wheel (not shown) drives the saw chain around the saw bar.
- the outlet shaft 11 is also provided with a brake drum 12 that is surrounded by a brake band 13 having one end fixed to a base structure 14 of the chain saw whereas the other end of the brake band is secured to a first end of an elongated brake lever 15.
- the brake lever is at its mid part turnably arranged about a shaft 16 that is fixed to the base structure 14 whereas the second end of the lever 15 is turnably secured to a link arm mechanism that comprises a first and a second arm 17 and 18 resp.
- the first arm 17 is at one end coupled to said lever 15 whereas it at its other end via a dowel 19 is pivotally connected to one end of the second arm 18 which is shorter than the first arm.
- the dowel 19 is preferably under the influence of a spring (not shown) that creates a force F that pushes the dowel downwards in Fig. 1 .
- the other end of the second arm is pivotally connected to a slider 20 that is movable sideways in Fig. 1 in a guide 21 arranged at the base structure.
- the link arm mechanism constitutes a knee shaped structure that can be turned such that the connection between the first and second link arm in one "locked" position rests against an abutment surface 22 on the slider 20 whereas the connection part can be released from this position by a triggering arrangement that is connected to a conventional turnable hand protector (not shown) arranged at the chain saw and that applies an upwardly directed force in Fig. 1 on the dowel 19 when the hand protector is activated.
- the arrangement also comprises a tension spring 23 of the helical type. One end of this spring is secured to the slider 20 whereas the other end is in engagement with the brake lever 15 close to the turning connection between the lever 15 and the first arm 17.
- the tension spring 23 encloses a coaxial compression spring 24 of the helical type. One end of the compression spring 24 rests against a seat 25 that is a part of the base structure 14 whereas the other end rest against the slider 20.
- the slider 20 is linearly movable in the guide 21 by means of an element 26 that by means of a mechanical transmission (not shown) is connected to a throttle knob arranged in the operating handle of the chain saw.
- the arrangement operates in the following manner.
- the brake is not activated as appears from Fig. 1-3 since the throttle knob is depressed thereby keeping the slider 20 is in its right hand position in Fig. 1 . Consequently the forces from the throttle knob will be transferred to the slider 20 and further to the second and first arms 18 and 17, which are in the locked position where they engage the abutment surface 22, as well as to the brake lever 15.
- the upper part of the lever is in a right hand position in Fig. 1 whereas the lower part is in a left hand position causing the brake band 13 to be out of engagement with the brake drum.
- the compression spring 24 is in its compressed state.
- the kick brake becomes activated in order to immediately stop the chain from running, the situation is such as shown in Figs. 7-9 .
- the hand protector has been turned and by means of a transmission element acted on the dowel 19 and moved the connecting ends of the link arms 18, 17 upwards to the position shown in Fig. 7 .
Description
- This invention relates to a motor chain saw with a chain brake arrangement comprising a kick brake and a coasting brake that via a link arm mechanism are acting on a brake lever that is pivotally arranged on a shaft directly or indirectly fixed to a chain saw base structure, said brake lever being connected to a brake band acting on a brake drum which is drivingly connected with the outlet shaft of the motor.
- Chain saws of the type mentioned above are previously known, see for instance
US 5813123 A1 andUS 5480009 : The known devices are usually complicated, expensive and difficult to assemble. The purpose of this invention is to achieve a braking arrangement that is compact and built into the motor such that the braking arrangement takes little space when assembled into the chain. Moreover the arrangement is simple and reliable and well suited for its purpose. - An embodiment of the invention will now be described with reference to the accompanying drawing on which
Fig. 1 is a front view showing the brake arrangement in its disengaged state whereasFig. 2 and3 is a plan view and a rear view of the brake in the position shown inFig.1 ,Fig 4 is a front view of the arrangement when the brake is activated by the coasting brake andFig. 5 and 6 is the corresponding plan view and rear view,Fig. 7 is a front view of the arrangement when it has been activated by the kick brake whereasFig. 8 and9 is the corresponding plan view and rear view. - A chain saw is in a conventional way provided with an
electric motor 10 that rotates anoutlet shaft 11 that via a transmission and a sprocket wheel (not shown) drives the saw chain around the saw bar. Theoutlet shaft 11 is also provided with abrake drum 12 that is surrounded by abrake band 13 having one end fixed to abase structure 14 of the chain saw whereas the other end of the brake band is secured to a first end of anelongated brake lever 15. The brake lever is at its mid part turnably arranged about ashaft 16 that is fixed to thebase structure 14 whereas the second end of thelever 15 is turnably secured to a link arm mechanism that comprises a first and asecond arm first arm 17 is at one end coupled to saidlever 15 whereas it at its other end via adowel 19 is pivotally connected to one end of thesecond arm 18 which is shorter than the first arm. Thedowel 19 is preferably under the influence of a spring (not shown) that creates a force F that pushes the dowel downwards inFig. 1 . The other end of the second arm is pivotally connected to aslider 20 that is movable sideways inFig. 1 in aguide 21 arranged at the base structure. The link arm mechanism constitutes a knee shaped structure that can be turned such that the connection between the first and second link arm in one "locked" position rests against an abutment surface 22 on theslider 20 whereas the connection part can be released from this position by a triggering arrangement that is connected to a conventional turnable hand protector (not shown) arranged at the chain saw and that applies an upwardly directed force inFig. 1 on thedowel 19 when the hand protector is activated. - The arrangement also comprises a
tension spring 23 of the helical type. One end of this spring is secured to theslider 20 whereas the other end is in engagement with thebrake lever 15 close to the turning connection between thelever 15 and thefirst arm 17. Thetension spring 23 encloses acoaxial compression spring 24 of the helical type. One end of thecompression spring 24 rests against aseat 25 that is a part of thebase structure 14 whereas the other end rest against theslider 20. Theslider 20 is linearly movable in theguide 21 by means of anelement 26 that by means of a mechanical transmission (not shown) is connected to a throttle knob arranged in the operating handle of the chain saw. - The arrangement operates in the following manner. During normal working conditions the brake is not activated as appears from
Fig. 1-3 since the throttle knob is depressed thereby keeping theslider 20 is in its right hand position inFig. 1 . Consequently the forces from the throttle knob will be transferred to theslider 20 and further to the second andfirst arms brake lever 15. This means that the upper part of the lever is in a right hand position inFig. 1 whereas the lower part is in a left hand position causing thebrake band 13 to be out of engagement with the brake drum. Simultaneously thecompression spring 24 is in its compressed state. - If the throttle knob is released to stop the motor after switching off the drive motor the situation is such as shown in
Fig. 4-6 . In this position theslider 20 has been moved to the left hand position by means of thecompression spring 24 since the opposite force created by the throttle knob transmission has ceased. During this movement the forces from thecompression spring 24 are transferred to the second andfirst link arms brake lever 15 such that the upper part of the lever is moved in the left hand direction whereas the lower part of thelever 15 is moved in the right hand direction causing thebrake band 13 to be tightened around thebrake drum 12 such that the chain is stopped from running. - If the kick brake becomes activated in order to immediately stop the chain from running, the situation is such as shown in
Figs. 7-9 . In this position the hand protector has been turned and by means of a transmission element acted on thedowel 19 and moved the connecting ends of thelink arms Fig. 7 . This means that thetension spring 23 is activated and pulls the upper end of thebrake lever 15 in the left hand direction whereas the lower end of thelever 15 is moved in the right hand direction such that thebrake band 13 is tightened around thebrake drum 12. - It should be said that even if the brake arrangement is primarily directed towards chain saws driven by electric motors the arrangement could as well be used for combustion driven chain saws.
Claims (9)
- A motor chain saw with a chain brake arrangement comprising a kick brake and a coasting brake which via a link arm mechanism are acting on a brake lever (15) that is pivotally arranged on a shaft (16) directly or indirectly fixed to a chain saw base structure (14), said brake lever being connected to a brake band (13) acting on a brake drum (12) which is drivingly connected with the outlet shaft (11) of the motor characterized in that the link arm mechanism is connected to a slider (20) that is movable with respect to said base structure (14).
- A chain saw according to claim 1 characterised in that said link arm mechanism comprises a first arm (18) and a second arm (17) that are turnably arranged with respect to one another, the first arm (18) being turnably arranged with respect to the brake lever (15) whereas the second arm is turnably arranged with respect to the slider (20).
- A chain saw according to claim 2 characterised in that the brake lever (15) is elongated and the brake band (13) is connected to one end of the brake lever and the second arm (17) is connected to the other end of the lever whereas the shaft (16) is arranged between said ends.
- A chain saw according to any of the previous claims characterised in that a tension spring (23) is arranged between the slider (20) and the brake lever (15).
- A chain saw according to any of the previous claims characterised in that a compression spring (24) is arranged between the slider (20) and the base structure (14).
- A chain saw according to claim 4 and 5 characterised in that the tension spring (23) as well as the compression spring (24) are helical springs that are arranged coaxially.
- A chain saw according to any of the previous claims characterised in that the movement of said slider (20) is under the influence of a transmission arrangement connected to a throttle lever.
- A chain saw according to any of the previous claims characterised in that the link arm mechanism by means of a hand protection element is movable from a first locked position in which a part of the mechanism is in a resting position against an abutment surface (22) to a second released position in which said part is free from the abutment surface (22).
- A chain saw according to claim 8 characterised in that the link arm mechanism is under the influence of a spring that pushes said part against the abutment surface (22).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE0402907A SE0402907D0 (en) | 2004-11-29 | 2004-11-29 | Chain saw brake arrangement |
PCT/SE2005/001510 WO2006057589A1 (en) | 2004-11-29 | 2005-10-11 | Chain saw brake arrangement |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1817144A1 EP1817144A1 (en) | 2007-08-15 |
EP1817144A4 EP1817144A4 (en) | 2013-09-25 |
EP1817144B1 true EP1817144B1 (en) | 2014-08-13 |
Family
ID=33538407
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP05792433.4A Not-in-force EP1817144B1 (en) | 2004-11-29 | 2005-10-11 | Chain saw brake arrangement |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP1817144B1 (en) |
SE (1) | SE0402907D0 (en) |
WO (1) | WO2006057589A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015133940A1 (en) * | 2014-03-04 | 2015-09-11 | Husqvarna Ab | Coast brake control system |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
SU893519A1 (en) * | 1980-02-08 | 1981-12-30 | Центральный Научно-Исследовательский И Проектно-Конструкторский Институт Механизации И Энергетики Лесной Промышленности | Braking apparatus for power saw sawing chain |
SE457626B (en) * | 1983-07-08 | 1989-01-16 | Stihl Maschf Andreas | KEDJEBROMANORDNING |
DE3530685C5 (en) * | 1985-08-28 | 2005-07-21 | Fa. Andreas Stihl | Electric motor chainsaw |
DE3608523A1 (en) * | 1986-03-14 | 1987-09-17 | Bosch Gmbh Robert | QUICK STOP DEVICE FOR STOPPING A SAW CHAIN OF A PORTABLE MOTOR CHAIN SAW |
DE3639650A1 (en) * | 1986-11-20 | 1988-06-01 | Stihl Maschf Andreas | Motor chainsaw |
DE4330850A1 (en) * | 1993-09-11 | 1995-03-16 | Stihl Maschf Andreas | Mechanical two-circuit braking system |
FR2733932B1 (en) * | 1995-05-11 | 1999-01-22 | Stihl Maschf Andreas | ENGINE CHAIN CHAINSAW EQUIPPED WITH A CHAIN BRAKING DEVICE |
GB9804796D0 (en) * | 1998-03-06 | 1998-04-29 | Black & Decker Inc | Clutch mechanism for a chain saw |
DE19931251A1 (en) * | 1999-07-07 | 2001-01-11 | Bosch Gmbh Robert | Chainsaw |
DE20009070U1 (en) * | 2000-05-19 | 2001-09-27 | Dolmar Gmbh | Motor chain saw with non-return brake and outlet brake |
-
2004
- 2004-11-29 SE SE0402907A patent/SE0402907D0/en unknown
-
2005
- 2005-10-11 EP EP05792433.4A patent/EP1817144B1/en not_active Not-in-force
- 2005-10-11 WO PCT/SE2005/001510 patent/WO2006057589A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
EP1817144A1 (en) | 2007-08-15 |
WO2006057589A1 (en) | 2006-06-01 |
SE0402907D0 (en) | 2004-11-29 |
EP1817144A4 (en) | 2013-09-25 |
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