EP2059113A1 - Arrangement in a portable tool - Google Patents

Arrangement in a portable tool

Info

Publication number
EP2059113A1
EP2059113A1 EP06784156A EP06784156A EP2059113A1 EP 2059113 A1 EP2059113 A1 EP 2059113A1 EP 06784156 A EP06784156 A EP 06784156A EP 06784156 A EP06784156 A EP 06784156A EP 2059113 A1 EP2059113 A1 EP 2059113A1
Authority
EP
European Patent Office
Prior art keywords
clutch cover
elastic
washer
crankcase
tube
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.)
Withdrawn
Application number
EP06784156A
Other languages
German (de)
French (fr)
Other versions
EP2059113A4 (en
Inventor
Egon Karlsson
Göte KARLSSON
Lars WÜRZIG
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.)
Husqvarna AB
Original Assignee
Husqvarna AB
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 Husqvarna AB filed Critical Husqvarna AB
Publication of EP2059113A1 publication Critical patent/EP2059113A1/en
Publication of EP2059113A4 publication Critical patent/EP2059113A4/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01D—HARVESTING; MOWING
    • A01D34/00—Mowers; Mowing apparatus of harvesters
    • A01D34/835—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes
    • A01D34/90—Mowers; Mowing apparatus of harvesters specially adapted for particular purposes for carrying by the operator
    • A01D34/905—Vibration dampening means

Definitions

  • the claimed invention relates to an arrangement in a portable tool comprising an engine and related components placed in one end of an elongated tube and a working tool in the opposite end of the tube.
  • Engine powered portable tools are widely used to facilitate work in forests, gardens and parks.
  • tools like for example trimmers, clearing saws and cutters for pruning of trees.
  • These tools are available in different sizes in order to meet the requirements for different kinds of work. The smallest ones are hand held while bigger and heavier tools are carried in an ergonomic harness or strap placed around the shoulders of the operator.
  • This category of portable tools all have an engine, either a combustion or electrical engine, and related components placed in one end of an elongated tube.
  • a drive shaft is extending from a clutch connected to the shaft from the engine inside the tube to a gear located inside a gear housing secured to the tube in the opposite end as the engine.
  • a working tool is releasable secured to a drive pin extending from the gear to make it possible to replace worn out working tools or change to a different type of working tool.
  • vibrations are generated in the engine as well as in the clutch. These vibrations are transferred to other tool components where they, after the tool has been used for a while, cause structural damages to some of the components.
  • Vibrations transferred to the tool handles that the operator is using to manoeuvre the tool also affect the working conditions for the operator in a negative way.
  • the object of the claimed invention is to reduce structural damages in the clutch cover, the securing of the tube in the clutch cover and the tube as well as improving the working conditions for the operator.
  • the claimed arrangement provides an elastic securing of the clutch cover to the crank case.
  • the elastic securing of the clutch cover to the crankcase reduces the transfer of vibrations from the crank case and the clutch to the clutch cover and further to the tube and other components secured to the tube.
  • Another advantage with the claimed arrangement is that it reduces the amount of vibrations in the tool handles that the operator is using to control and manoeuvre the tool. This improves the working conditions for the operator.
  • One preferred embodiment of the claimed invention is to provide each screw that secures the clutch cover to the engine crankcase with one elastic element.
  • a less complicated solution is to only provide one or some of the screws that secure the clutch cover to the crankcase with an elastic element. This less complicated solution does however not reduce the amount of vibrations transferred as efficient as the preferred embodiment of the invention.
  • each elastic element comprise two elastic washers.
  • a first elastic washer is placed between the crankcase and the clutch cover and a second elastic washer is placed between the clutch cover and a stiff washer in the end of the screw or an enlarged screw head that acts as a stiff washer.
  • a less complicated solution is to only use the first washer placed between the crankcase and the clutch cover. The reduction of vibrations transferred is however not as efficient as if two washers are used. Another less complicated solution is to only provide one or some of the screws that secures the clutch cover to the crank caser with an elastic element
  • the elastic washers are preferably a cup spring but also a washer made of an elastic material like for example rubber or with a shape that gives the washer elastic features are usable.
  • the cup spring or elastic washer characteristics are selected to meet the requirements of the tool that they are used for. A larger tool requires a stiffer spring.
  • Another preferred embodiment of the claimed invention is to provide the stiff washer with a spacing sleeve placed on the side of the washer aligning the second elastic washer.
  • the spacing sleeve is extending through the second washer, the clutch cover and the first washer and has an axial length selected so that the end surface of the spacing sleeve is in contact with the outer surface of the crank case when the right tension is achieved in the first and second elastic washers.
  • the spacing sleeve thereby ensures a constant and correct tension in the washers which facilitate the mounting of the components considerably since the person or machine mounting the components only has to continue the screwing until the end surface of the spacing sleeve is in contact with the crank case surface.
  • Figure 1 Illustrates a perspective view of a portable tool.
  • Figure 2. Illustrates a perspective view of the claimed arrangement.
  • Figure 3. Illustrates a perspective view of the claimed arrangement and the side of the crankcase to which the clutch cover is secured.
  • Figure 4. Illustrates a second embodiment of the elastic element.
  • Figure 5. Illustrates a cross sectional view through the longitudinal axial direction of the clutch cover. DETAILED DESCRIPTION OF THE DRAWINGS
  • Figure one is disclosing a portable saw 10 for pruning of trees with an engine 13 and related components placed in one end of an elongated tube 11 and a working tool 12 placed in the opposite end of the tube 11.
  • the engine comprises a crankcase 14, disclosed in figure 3, and a crankshaft from the engine 13 is connected to a clutch.
  • the clutch is surrounded by a clutch cover 16 secured to the crankcase 14 by a number of screws 25.
  • a drive shaft 18 is extending from the clutch inside the tube 11 to the working tool 12 in the end of the tube 11.
  • FIG 5 is a cross sectional view through the longitudinal axial direction of the tube 11 disclosed.
  • the drive shaft 18 is extending from an attachment device 19 in the centre of the clutch drum 20 coaxially with the longitudinal axle of the tube 11.
  • the clutch cover 16 is shaped to surround the clutch drum 20 and is provided with a protruding tube shaped portion 21.
  • the tube shaped portion 21 is used for fastening of the tube to the clutch cover 16 and the engine 13.
  • the tube 11 is pushed into the open end of the tube shaped portion 21 and secured when the two clamping screws 22 are tensioned.
  • the protruding tube shaped portion 21 is in this embodiment integrated in the clutch cover 16 but a separate component secured to the clutch cover could also be used for this purpose.
  • the clutch cover 16 is shaped so that substantially the entire contact surface aligns the crankcase 14 surface surrounding the clutch 15.
  • the clutch cover is provided with four holes 23 spread around the circumference of the clutch cover 16 that is placed towards the crankcase 14.
  • the crankcase 14 is provided with one threaded portion for each of the holes 23 in the clutch cover 16.
  • the threaded portions in the crankcase 14 are positioned so that the tube 11 is placed co-axially with the output shaft from the clutch when the clutch cover 16 is fastened to the crankcase 14 by one screw 25 in each hole 23 in the clutch cover 16.
  • Different embodiments of the clutch cover and crankcase could have different numbers of holes that consequently are placed differently.
  • Each screw 25, in this embodiment is provided with an elastic element to allow movements between the crankcase 14 and the clutch cover 16 in order to reduce the amount of vibrations transferred from the engine 13 and the clutch 15 to the tube 11.
  • Elastic elements could however be provided only on some of the screws 25 in order to simplify and reduce the number of components in the tool. The simplified embodiment is thus not as efficient in the reduction of vibrations as the preferred embodiment.
  • the elastic element in this embodiment, comprise of a first cup spring 30 placed between the surface of the crankcase 14 and the surface of the clutch cover 16 facing the crankcase 14 and a second cup spring 31 placed between the surface of the clutch cover facing away from the crankcase 14 and a stiff washer 32 in the end of the screw 25 or an enlarged screw head that supports the cup spring 31.
  • first 30 and second 31 cup spring could be combined into a double-cup spring 33, illustrated in figure 4.
  • the use of the double-cup spring 33 has the same technical features as the use of the first 30 and second 31 cup spring but is easier to mount and the risk for loss of a spring is reduced.
  • cup springs 30, 31 or one of the springs 30, 31 in the elastic element could also be replaced by elastic washers made of for example rubber, a helical spring or a washer shaped to provide the elastic securing of the clutch cover 16 to the crankcase 14.
  • a spacing sleeve 35 is in the illustrated embodiment placed on each screw 25 provided with an elastic element.
  • the axial length of the spacing sleeve 35 is selected so that a first end surface of the spacing sleeve 35 is in contact with the crankcase 14 surface and a second end surface of the spacing sleeve is in contact with the stiff washer 32 when the screw is tightened.
  • the length of the spacing sleeve 35 ensures that the optimal tension in the springs 30, 31 are achieved when the first end surface is in contact with the crank case 14 and the second end surface is in contact with the stiff washer 32.
  • At least one handle is secured to tool somewhere along the tube 11.
  • the handle is used for manoeuvring the tool. Necessary control functions like for example a throttle device is incorporated in the handles. Less vibration transferred from the engine 13 and the clutch to the tube 11 consequently also reduce the amount of vibrations in the handles since they are placed on the tube 11. Smaller tools may have the handles placed directly on the tube 11.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Environmental Sciences (AREA)
  • Harvester Elements (AREA)

Abstract

The claimed invention is related to an arrangement in a portable tool (10). The tool (10) comprises an engine (13) and related components placed in one end of an elongated tube (11) and a working tool (12) in the opposite end of the tube (11). A drive shaft (18) extends inside the tube (11) from the engine (13) via a clutch to the working tool (12). The clutch is secured to a crankcase (14) and surrounded by a clutch cover (16) provided with means for fastening the tube (11) to the clutch cover (16) and the clutch cover (16) is secured to the engine crankcase (14) via at least one elastic element.

Description

ARRANGEMENT IN A PORTABLE TOOL
The claimed invention relates to an arrangement in a portable tool comprising an engine and related components placed in one end of an elongated tube and a working tool in the opposite end of the tube.
BACKGROUND OF THE INVENTION
Engine powered portable tools are widely used to facilitate work in forests, gardens and parks. There are a number of different types of tools available like for example trimmers, clearing saws and cutters for pruning of trees. These tools are available in different sizes in order to meet the requirements for different kinds of work. The smallest ones are hand held while bigger and heavier tools are carried in an ergonomic harness or strap placed around the shoulders of the operator.
This category of portable tools all have an engine, either a combustion or electrical engine, and related components placed in one end of an elongated tube. A drive shaft is extending from a clutch connected to the shaft from the engine inside the tube to a gear located inside a gear housing secured to the tube in the opposite end as the engine. A working tool is releasable secured to a drive pin extending from the gear to make it possible to replace worn out working tools or change to a different type of working tool.
During use vibrations are generated in the engine as well as in the clutch. These vibrations are transferred to other tool components where they, after the tool has been used for a while, cause structural damages to some of the components.
Vibrations transferred to the tool handles that the operator is using to manoeuvre the tool also affect the working conditions for the operator in a negative way. OBJECT OF THE INVENTION
The object of the claimed invention is to reduce structural damages in the clutch cover, the securing of the tube in the clutch cover and the tube as well as improving the working conditions for the operator.
SUMMARY OF THE INVENTION
The problems disclosed above are solved by the claimed arrangement with the features defined in the characterising portion of the independent claim.
The claimed arrangement provides an elastic securing of the clutch cover to the crank case. The elastic securing of the clutch cover to the crankcase reduces the transfer of vibrations from the crank case and the clutch to the clutch cover and further to the tube and other components secured to the tube.
Another advantage with the claimed arrangement is that it reduces the amount of vibrations in the tool handles that the operator is using to control and manoeuvre the tool. This improves the working conditions for the operator.
One preferred embodiment of the claimed invention is to provide each screw that secures the clutch cover to the engine crankcase with one elastic element. A less complicated solution is to only provide one or some of the screws that secure the clutch cover to the crankcase with an elastic element. This less complicated solution does however not reduce the amount of vibrations transferred as efficient as the preferred embodiment of the invention.
In the preferred embodiment of the invention does each elastic element comprise two elastic washers. A first elastic washer is placed between the crankcase and the clutch cover and a second elastic washer is placed between the clutch cover and a stiff washer in the end of the screw or an enlarged screw head that acts as a stiff washer.
A less complicated solution is to only use the first washer placed between the crankcase and the clutch cover. The reduction of vibrations transferred is however not as efficient as if two washers are used. Another less complicated solution is to only provide one or some of the screws that secures the clutch cover to the crank caser with an elastic element
The elastic washers are preferably a cup spring but also a washer made of an elastic material like for example rubber or with a shape that gives the washer elastic features are usable. The cup spring or elastic washer characteristics are selected to meet the requirements of the tool that they are used for. A larger tool requires a stiffer spring.
Another preferred embodiment of the claimed invention is to provide the stiff washer with a spacing sleeve placed on the side of the washer aligning the second elastic washer. The spacing sleeve is extending through the second washer, the clutch cover and the first washer and has an axial length selected so that the end surface of the spacing sleeve is in contact with the outer surface of the crank case when the right tension is achieved in the first and second elastic washers. The spacing sleeve thereby ensures a constant and correct tension in the washers which facilitate the mounting of the components considerably since the person or machine mounting the components only has to continue the screwing until the end surface of the spacing sleeve is in contact with the crank case surface.
BRIEF DESCRIPTION OF THE DRAWINGS
The claimed invention is disclosed with reference to the attached drawings.
Figure 1. Illustrates a perspective view of a portable tool. Figure 2. Illustrates a perspective view of the claimed arrangement. Figure 3. Illustrates a perspective view of the claimed arrangement and the side of the crankcase to which the clutch cover is secured. Figure 4. Illustrates a second embodiment of the elastic element. Figure 5. Illustrates a cross sectional view through the longitudinal axial direction of the clutch cover. DETAILED DESCRIPTION OF THE DRAWINGS
Figure one is disclosing a portable saw 10 for pruning of trees with an engine 13 and related components placed in one end of an elongated tube 11 and a working tool 12 placed in the opposite end of the tube 11. The engine comprises a crankcase 14, disclosed in figure 3, and a crankshaft from the engine 13 is connected to a clutch. The clutch is surrounded by a clutch cover 16 secured to the crankcase 14 by a number of screws 25. A drive shaft 18 is extending from the clutch inside the tube 11 to the working tool 12 in the end of the tube 11.
In figure 5 is a cross sectional view through the longitudinal axial direction of the tube 11 disclosed. The drive shaft 18 is extending from an attachment device 19 in the centre of the clutch drum 20 coaxially with the longitudinal axle of the tube 11. The clutch cover 16 is shaped to surround the clutch drum 20 and is provided with a protruding tube shaped portion 21. The tube shaped portion 21 is used for fastening of the tube to the clutch cover 16 and the engine 13. The tube 11 is pushed into the open end of the tube shaped portion 21 and secured when the two clamping screws 22 are tensioned. The protruding tube shaped portion 21 is in this embodiment integrated in the clutch cover 16 but a separate component secured to the clutch cover could also be used for this purpose.
The clutch cover 16 is shaped so that substantially the entire contact surface aligns the crankcase 14 surface surrounding the clutch 15. The clutch cover is provided with four holes 23 spread around the circumference of the clutch cover 16 that is placed towards the crankcase 14. The crankcase 14 is provided with one threaded portion for each of the holes 23 in the clutch cover 16. The threaded portions in the crankcase 14 are positioned so that the tube 11 is placed co-axially with the output shaft from the clutch when the clutch cover 16 is fastened to the crankcase 14 by one screw 25 in each hole 23 in the clutch cover 16. Different embodiments of the clutch cover and crankcase could have different numbers of holes that consequently are placed differently.
Each screw 25, in this embodiment, is provided with an elastic element to allow movements between the crankcase 14 and the clutch cover 16 in order to reduce the amount of vibrations transferred from the engine 13 and the clutch 15 to the tube 11. Elastic elements could however be provided only on some of the screws 25 in order to simplify and reduce the number of components in the tool. The simplified embodiment is thus not as efficient in the reduction of vibrations as the preferred embodiment.
The elastic element, in this embodiment, comprise of a first cup spring 30 placed between the surface of the crankcase 14 and the surface of the clutch cover 16 facing the crankcase 14 and a second cup spring 31 placed between the surface of the clutch cover facing away from the crankcase 14 and a stiff washer 32 in the end of the screw 25 or an enlarged screw head that supports the cup spring 31.
In order to reduce the number of components in the tool the first 30 and second 31 cup spring could be combined into a double-cup spring 33, illustrated in figure 4. The use of the double-cup spring 33 has the same technical features as the use of the first 30 and second 31 cup spring but is easier to mount and the risk for loss of a spring is reduced.
The cup springs 30, 31 or one of the springs 30, 31 in the elastic element could also be replaced by elastic washers made of for example rubber, a helical spring or a washer shaped to provide the elastic securing of the clutch cover 16 to the crankcase 14.
A spacing sleeve 35 is in the illustrated embodiment placed on each screw 25 provided with an elastic element. The axial length of the spacing sleeve 35 is selected so that a first end surface of the spacing sleeve 35 is in contact with the crankcase 14 surface and a second end surface of the spacing sleeve is in contact with the stiff washer 32 when the screw is tightened. The length of the spacing sleeve 35 ensures that the optimal tension in the springs 30, 31 are achieved when the first end surface is in contact with the crank case 14 and the second end surface is in contact with the stiff washer 32.
At least one handle is secured to tool somewhere along the tube 11. The handle is used for manoeuvring the tool. Necessary control functions like for example a throttle device is incorporated in the handles. Less vibration transferred from the engine 13 and the clutch to the tube 11 consequently also reduce the amount of vibrations in the handles since they are placed on the tube 11. Smaller tools may have the handles placed directly on the tube 11.

Claims

1. Arrangement in a portable tool (10), the tool (10) comprises an engine (13) and related components placed in one end of an elongated tube (11) and a working tool (12) in the opposite end, a drive shaft (18) extending inside the tube (11) from the engine (13) via a clutch to the working tool (12), the clutch being secured to a crankcase (14) and surrounded by a clutch cover (16) provided with means for fastening the tube (11) to the clutch cover (16), characterised in that the clutch cover (16) is secured to the crankcase (14) via at least one elastic element.
2. Arrangement according to claim 1, characterised in that the clutch cover (16) is secured to the engine crank (14) case by at least three screws (25) and at least one of the screws (25) is provided with an elastic element.
3. Arrangement according to claim 1 or 2, characterised in that the clutch cover (16) is secured to the crankcase (14) by at least three screws (25) and each screw (25) is provided with an elastic element.
4. Arrangement according to claim 2 or 3, characterised in that an elastic element comprises a first elastic washer (30) placed between the crank case (14) and the clutch cover (16) and a second elastic washer (31) placed between the clutch cover (16) and a stiff washer (32) in the end of the screw (25) or an enlarged screw head.
5. Arrangement according to claim 4, characterised in that the elastic washers
(30, 31) either are a cup springs, a helical spring or a washer made of an elastic material like for example rubber.
6. Arrangement according to claim 4 or 5, characterised in that a spacing sleeve
(35) is provided around the screw (25) in the centre of the stiff washer (32) or the enlarged screw head that aligns the second elastic washer (31), the axial length of the spacing sleeve (35) is selected so that the spacing sleeve (35) extend from the stiff washer (32) or the enlarged screw head through said elastic washers (30, 31) and the clutch cover (16) to the crankcase (14).
7. Arrangement according to claim 6, characterised in that the length of the spacing sleeve (35) is selected so that the appropriate tension on the elastic washers (30, 31) are achieved when a first end surface of the spacing sleeve (35) is in contact with the crankcase (14) and a second end surface is in contact with the stiff washer (32) or the enlarged screw head.
EP06784156A 2006-09-08 2006-09-08 Arrangement in a portable tool Withdrawn EP2059113A4 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/SE2006/001026 WO2008030148A1 (en) 2006-09-08 2006-09-08 Arrangement in a portable tool

Publications (2)

Publication Number Publication Date
EP2059113A1 true EP2059113A1 (en) 2009-05-20
EP2059113A4 EP2059113A4 (en) 2010-06-02

Family

ID=39157486

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06784156A Withdrawn EP2059113A4 (en) 2006-09-08 2006-09-08 Arrangement in a portable tool

Country Status (3)

Country Link
EP (1) EP2059113A4 (en)
CA (1) CA2659305A1 (en)
WO (1) WO2008030148A1 (en)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4727828A (en) * 1985-03-29 1988-03-01 Komatsu Zenoah Company Portable engine unit
DE3525593A1 (en) * 1985-07-18 1987-01-22 Stihl Maschf Andreas MOTOR CHAIN SAW
FR2726216B1 (en) * 1994-10-29 1997-06-06 Stihl Maschf Andreas MANUALLY GUIDED MACHINE TOOL, ESPECIALLY BRUSH CUTTER OR TRIMMER
DE19730356C2 (en) * 1997-07-15 2001-05-17 Wacker Werke Kg Vibration-damped breaker and / or hammer drill
JPH10266867A (en) * 1997-03-19 1998-10-06 Kioritz Corp Portable power work machine
DE10034437B4 (en) * 2000-07-15 2011-07-14 Andreas Stihl AG & Co., 71336 Hand-held implement
DE10340178B3 (en) * 2003-09-01 2005-04-07 Hilti Ag power tool
GB2421000A (en) * 2004-12-07 2006-06-14 Black & Decker Inc Vibration attenuated power tool

Also Published As

Publication number Publication date
EP2059113A4 (en) 2010-06-02
CA2659305A1 (en) 2008-03-13
WO2008030148A1 (en) 2008-03-13

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