WO2010005485A1 - Torque-limited chain tensioning for power tools - Google Patents
Torque-limited chain tensioning for power tools Download PDFInfo
- Publication number
- WO2010005485A1 WO2010005485A1 PCT/US2009/003758 US2009003758W WO2010005485A1 WO 2010005485 A1 WO2010005485 A1 WO 2010005485A1 US 2009003758 W US2009003758 W US 2009003758W WO 2010005485 A1 WO2010005485 A1 WO 2010005485A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chainsaw
- guide bar
- cam
- clutch
- cutting chain
- Prior art date
Links
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
- B27B17/14—Arrangements for stretching the chain saw
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
- F16D7/022—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with a helical band or equivalent member co-operating with a cylindrical torque limiting coupling surface
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/02—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type
- F16D7/024—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces
- F16D7/025—Slip couplings, e.g. slipping on overload, for absorbing shock of the friction type with axially applied torque limiting friction surfaces with flat clutching surfaces, e.g. discs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D7/00—Slip couplings, e.g. slipping on overload, for absorbing shock
- F16D7/04—Slip couplings, e.g. slipping on overload, for absorbing shock of the ratchet type
Definitions
- the present disclosure generally relates to the field of chain tensioning for power tools, and more particularly to a torque-limiting chain tensioning device for a chainsaw.
- the present disclosure is directed to a device for reducing the range of chain tension created when a user replaces or re-tensions a chain.
- Providing load limited tension brings the chain up to a specified tension and then maintains that tension during the clamping of the bar.
- This configuration may also provide a solid surface that relies more on solid material interaction rather than coefficients of friction and normal force generation.
- the invention is directed to a chainsaw powered by a motor housed by a chainsaw body.
- the chainsaw includes a cutting chain connected so as to be driven by the motor, and a guide bar mounting stud extending from the chainsaw body.
- the chainsaw also has an adjustably connected guide bar.
- the guide bar has a track for supporting the cutting chain around a periphery of the guide bar, an adjustment pin extending from a side face thereof, and an elongated slot formed therein, wherein the guide bar mounting stud is configured to extend through said slot in the guide bar.
- the chainsaw also has a cam received on the guide bar mounting stud and having an eccentric groove facing the guide bar.
- the adjustment pin is received in the eccentric groove such that rotation of the cam causes the guide bar to be positioned along its longitudinal dimension with respect to the chainsaw body, thereby tensioning the cutting chain.
- the chainsaw also has a clutch connected to the cam for allowing no more than a predetermined load to be applied to the guide bar for tensioning the cutting chain.
- the clutch includes a wrap spring between the knob and the cam to limit the amount of tension which may be supplied to the cutting chain.
- the clutch includes a first series of magnets, and the cam includes a generally opposed second series of magnets, wherein the first and second series of magnets hold the cam in relation to the clutch until sufficient force is created such that the magnetic forces between the first and second series of magnets are no longer great enough to prevent a slip between the clutch and the cam, thereby limiting the torque that the cam can apply.
- the clutch includes a ring gear connected to one of the clutch and the cam, and one or more flexible fingers comprising a center gear connected to the other of the clutch or the cam.
- FIG. 1 is an isometric view illustrating a chainsaw
- FIG. 2 is a partial cutaway isometric view of the chainsaw illustrated in FIG. 1;
- FIG. 3 is a partial cross-sectional isometric view of a guide bar, a cam, and a clutch for the chainsaw illustrated in FIG. 1 ;
- FIG. 4 is a cross-sectional end elevation view of the guide bar, the cam, and the clutch illustrated in FIG. 3;
- FIG. 5 is a partial side elevation view of the guide bar and the cam illustrated in FIG. 3;
- FIG. 6 is a partial exploded isometric view of the guide bar, the cam, and the clutch illustrated in FIG. 3;
- FIG. 7 is a partial exploded isometric view of a guide bar, a cam, and a clutch for another chainsaw;
- FIG. 8 is another partial exploded isometric view of the guide bar, the cam, and the clutch illustrated in FIG. 7;
- FIG. 9 is a plan view of a clutch.
- FIGS. 1 through 6 a chainsaw 100 is illustrated in accordance with one exemplary embodiment of the present disclosure.
- the chainsaw is illustrated in accordance with one exemplary embodiment of the present disclosure.
- the 100 has a body 101 which incorporates a conventional motor and a guide bar 102 for supporting a cutting chain 103.
- the guide bar 102 comprises a longitudinal frame having two flat sides, one of the flat sides facing towards the body 101 and the other one of the flat sides facing away from the body.
- the guide bar 102 has rails 104 for keeping the cutting chain 103 centered on a track 106 extending around the periphery of the guide bar 102.
- the cutting chain 103 is supported by the guide bar 102 at a first end 108 of the guide bar 102, and is connected to and driven by a chain-drive output proximal to a second end 1 10 of the guide bar 102, such as an engine's drive sprocket inside the body 101 of the chainsaw 100.
- the guide bar 102 is mounted to the body 101 on stud 111 that extends from the body 101.
- the guide bar 102 has a slot 1 12 that has a width that corresponds closely to the diameter of the stud 111. While the positions of the stud 111 and the drive sprocket are fixed with relation to the body 101 of the chainsaw 100, the guide bar 102 may be adjusted along its longitudinal dimension as shown by the arrow A in FIG. 5 with relation to the body
- the guide bar 102 includes an adjustment pin 1 14 fixedly connected to the guide bar 102 for tensioning the cutting chain 103.
- the adjustment pin 1 14 is connected to a cam 116, and the cam 116 is connected to a clutch 1 18.
- the cam 116 is received on and rotates about the axis of the stud 1 11.
- the cam 116 has an eccentric groove 119 that receives the adjustment pin 1 14.
- the clutch 118 is configured to allow a predetermined load to be applied to the guide bar 102 via the adjustment pin 114.
- the predetermined load is set by the design of the clutch 118.
- the clutch 1 18 may include a knob 120 mounted on the stud 1 1 1, driven by a user.
- the clutch 1 18 will begin slipping and prevent the cutting chain 103 from being tensioned further.
- components of the clutch 1 18 can be selected to prevent the chain 103 from being over tensioned.
- the knob 120 will continue to turn while the clutch 1 18 slips to clamp the guide bar 102 down against the mounting surfaces of the power head of the chainsaw 100.
- the configuration of the chainsaw 100 including the adjustment pin 114 and the cam 116, may hold the guide bar 102 and prevent it from rotating about guide bar mounts.
- the clutch 1 18 includes a wrap spring 122 between the knob 120 and the cam 1 16 to limit the amount of tension which may be supplied to the cutting chain 103.
- the clutch 118 includes a first series of magnets 124
- the cam 1 16 includes a generally opposed second series of magnets 126.
- the first and second series of magnets 124 and 126 hold the driven parts in relation to the driving parts until sufficient force is created such that the magnetic forces between the first and second series of magnets are no longer great enough to prevent a slip between the parts limiting the torque that the driven parts can apply.
- two friction surfaces may be utilized such that the surfaces will slip relative to one another when the resistance torque of the driven parts is greater than the torque of the friction surfaces.
- the clutch 118 includes a ring gear 128 rotated by the knob 120 and one or more flexible fingers 130 comprising a center gear 132 connected to the cam 116.
- the fingers 130 may be constructed from a plastic material, such as Acrylonitrile Butadiene Styrene (ABS) or another type of plastic.
- ABS Acrylonitrile Butadiene Styrene
- the ring gear 128 may also be constructed from a plastic material.
- the ring gear 128 may include directioned teeth 134, providing slip torque between the ring gear 128 and the fingers 130 that is much higher in one direction than in an opposing direction.
- the clutch 118 slips, stopping tensioning or tightening of the ring gear 128.
- the clutch 1 18 may comprise a torque-limited transmission.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Forests & Forestry (AREA)
- Sawing (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/737,271 US8595943B2 (en) | 2008-06-24 | 2009-06-24 | Torque-limited chain tensioning for power tools |
CA2729341A CA2729341C (en) | 2008-06-24 | 2009-06-24 | Torque-limited chain tensioning for power tools |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13289008P | 2008-06-24 | 2008-06-24 | |
US61/132,890 | 2008-06-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010005485A1 true WO2010005485A1 (en) | 2010-01-14 |
Family
ID=41055077
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2009/003758 WO2010005485A1 (en) | 2008-06-24 | 2009-06-24 | Torque-limited chain tensioning for power tools |
Country Status (3)
Country | Link |
---|---|
US (1) | US8595943B2 (en) |
CA (1) | CA2729341C (en) |
WO (1) | WO2010005485A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE202010007886U1 (en) | 2010-06-11 | 2010-10-07 | Einhell Germany Ag | Chainsaw with tensioning device |
ITBO20090764A1 (en) * | 2009-11-24 | 2011-05-25 | Federica Muratori | MAGNETIC BRAKING DEVICE |
US20110167650A1 (en) * | 2008-06-24 | 2011-07-14 | Mtd Products Inc. | Torque-limited chain tensioning for power tools |
WO2011155880A1 (en) * | 2010-06-07 | 2011-12-15 | Husqvarna Ab | Automatic chain tensioner |
EP3736093A1 (en) * | 2019-05-10 | 2020-11-11 | Robert Bosch GmbH | Fixing device for fixing a chainsaw blade |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2013166251A (en) * | 2012-02-14 | 2013-08-29 | Hitachi Koki Co Ltd | Chain saw |
WO2013184105A1 (en) * | 2012-06-06 | 2013-12-12 | Husqvarna Ab | Feedback system for bar clamping |
DE102013003850A1 (en) * | 2013-03-06 | 2014-09-25 | Andreas Stihl Ag & Co. Kg | Hand-held implement with a tensioning device for a chain |
WO2014142722A1 (en) * | 2013-03-15 | 2014-09-18 | Husqvarna Ab | Chainsaw with self-locking knob assembly |
DE102014004526A1 (en) * | 2014-03-27 | 2015-10-01 | Andreas Stihl Ag & Co. Kg | Hand-held implement |
US10156290B2 (en) * | 2015-02-06 | 2018-12-18 | FLIR Belgium BVBA | Belt drive tensioning system |
EP3337648B1 (en) * | 2015-08-18 | 2021-11-17 | Black & Decker Inc. | Chain bar clutch system for a chainsaw, chain bar tightening clutch system for a chainsaw and method of positioning a chain bar on a chainsaw |
CN106171827B (en) * | 2016-08-26 | 2022-12-09 | 苏州金莱克精密机械有限公司 | Tool-free tensioning mechanism of chain saw |
CN112606107A (en) * | 2020-12-08 | 2021-04-06 | 芜湖精锋园林机械科技有限公司 | Electric saw chain blade mounting structure |
EP4039428A3 (en) * | 2021-02-03 | 2022-10-26 | Techtronic Cordless GP | Chainsaws |
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DE623303C (en) * | 1935-12-17 | Johannes Rothe | Safety coupling | |
GB661643A (en) * | 1948-11-19 | 1951-11-21 | Stanley Morton | Improvements in and relating to shaft couplings |
US2754438A (en) * | 1952-12-15 | 1956-07-10 | Magnetorque Couplings Ltd | Clutches of the permanent magnetic type |
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GB2403686A (en) * | 2003-07-08 | 2005-01-12 | Ggp Italy Spa | Tensioning device for chain saws |
DE102005034614A1 (en) * | 2005-07-18 | 2007-02-01 | Karl Hinderer | Overload safety and connection coupling e.g. rotating coupling, for transmission of torque between shafts, has permanent magnets arranged in orientation of magnetic poles, which are reciprocal to that of neighboring magnets |
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EP2036688A2 (en) * | 2007-09-14 | 2009-03-18 | Husqvarna UK Limited | Chainsaw |
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WO2010005485A1 (en) * | 2008-06-24 | 2010-01-14 | Mtd Products Inc | Torque-limited chain tensioning for power tools |
CN102355986B (en) * | 2009-03-18 | 2014-09-17 | 胡斯华纳有限公司 | Quick-tightening device for chain saw and chain unit for same |
-
2009
- 2009-06-24 WO PCT/US2009/003758 patent/WO2010005485A1/en active Application Filing
- 2009-06-24 CA CA2729341A patent/CA2729341C/en not_active Expired - Fee Related
- 2009-06-24 US US12/737,271 patent/US8595943B2/en active Active
Patent Citations (16)
Publication number | Priority date | Publication date | Assignee | Title |
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DE623303C (en) * | 1935-12-17 | Johannes Rothe | Safety coupling | |
GB661643A (en) * | 1948-11-19 | 1951-11-21 | Stanley Morton | Improvements in and relating to shaft couplings |
US2754438A (en) * | 1952-12-15 | 1956-07-10 | Magnetorque Couplings Ltd | Clutches of the permanent magnetic type |
DE947394C (en) * | 1952-12-16 | 1956-08-16 | Philips Nv | Magnetic coupling |
CH319336A (en) * | 1952-12-16 | 1957-02-15 | Philips Nv | Magnetic coupling |
DE1075903B (en) * | 1958-02-04 | 1960-02-18 | Siemens Ag | Safety coupling with permanent magnets |
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US4687082A (en) * | 1984-03-09 | 1987-08-18 | Z-Lyften Produktion Ab | Torque-sensing clutch |
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US20030196294A1 (en) * | 2002-04-18 | 2003-10-23 | Conrad Wayne Ernest | Appliance which utilizes a magnetic clutch to transmit power from a drive means to a moveable member and a magnetic clutch |
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DE102005034614A1 (en) * | 2005-07-18 | 2007-02-01 | Karl Hinderer | Overload safety and connection coupling e.g. rotating coupling, for transmission of torque between shafts, has permanent magnets arranged in orientation of magnetic poles, which are reciprocal to that of neighboring magnets |
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Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110167650A1 (en) * | 2008-06-24 | 2011-07-14 | Mtd Products Inc. | Torque-limited chain tensioning for power tools |
US8595943B2 (en) * | 2008-06-24 | 2013-12-03 | Mtd Products Inc | Torque-limited chain tensioning for power tools |
ITBO20090764A1 (en) * | 2009-11-24 | 2011-05-25 | Federica Muratori | MAGNETIC BRAKING DEVICE |
WO2011064713A1 (en) * | 2009-11-24 | 2011-06-03 | Federica Muratori | A magnetic braking device |
WO2011155880A1 (en) * | 2010-06-07 | 2011-12-15 | Husqvarna Ab | Automatic chain tensioner |
DE202010007886U1 (en) | 2010-06-11 | 2010-10-07 | Einhell Germany Ag | Chainsaw with tensioning device |
EP3736093A1 (en) * | 2019-05-10 | 2020-11-11 | Robert Bosch GmbH | Fixing device for fixing a chainsaw blade |
CN111958045A (en) * | 2019-05-10 | 2020-11-20 | 罗伯特·博世有限公司 | Fixing device for fixing a chain saw blade and chain saw |
CN111958045B (en) * | 2019-05-10 | 2024-07-09 | 罗伯特·博世有限公司 | Fixing device for fixing a blade of a chain saw and chain saw |
Also Published As
Publication number | Publication date |
---|---|
US8595943B2 (en) | 2013-12-03 |
CA2729341A1 (en) | 2010-01-14 |
CA2729341C (en) | 2016-06-07 |
US20110167650A1 (en) | 2011-07-14 |
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