WO1998033631A1 - Method and device for stretching the chain of a crosscut saw - Google Patents

Method and device for stretching the chain of a crosscut saw Download PDF

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Publication number
WO1998033631A1
WO1998033631A1 PCT/FI1998/000048 FI9800048W WO9833631A1 WO 1998033631 A1 WO1998033631 A1 WO 1998033631A1 FI 9800048 W FI9800048 W FI 9800048W WO 9833631 A1 WO9833631 A1 WO 9833631A1
Authority
WO
WIPO (PCT)
Prior art keywords
eccentric
bolt
saw
tightening
bolt head
Prior art date
Application number
PCT/FI1998/000048
Other languages
Finnish (fi)
French (fr)
Inventor
Pentti Lastunen
Jari Laaksonen
Original Assignee
Lako Forest Oy 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 Lako Forest Oy Ltd. filed Critical Lako Forest Oy Ltd.
Priority to AU56665/98A priority Critical patent/AU5666598A/en
Publication of WO1998033631A1 publication Critical patent/WO1998033631A1/en

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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
    • B27B17/14—Arrangements for stretching the chain saw

Definitions

  • the invention relates to a method and apparatus for automatically tightening the chain of a cutting saw, particularly the cutting saw of a harvester.
  • Figs . 1A-1E The present manual tightening practice is shown in Figs . 1A-1E.
  • Fig. 1A shows, from the direction of the pulling roller, the saw body 10 and the attached saw guide 30 with its chain 31. The chain is pulled by a drive wheel 32 in the saw body which is not shown in detail.
  • Fig. IB shows the saw body from the opposite direction.
  • Fig. 1C shows a lateral cross-section of the body 10.
  • the saw guide 30 is fastened to the body.
  • the body includes a protruding part 11 with an elongated slot 12 parallel to the saw guide 30.
  • the saw guide 30 is fastened to the body between two fastening plates 13, .14.
  • the upper fastening plate 13 adjoining the body is provided with a groove parallel to the saw guide in which a parallel projecting part of the protruding part runs (these details are not shown in the figures). This facilitates motion of the fastening plate 13 with its attachments with respect to the protruding part.
  • FIGs. ID and IE The present manual practice to tighten the chain is best seen in Figs. ID and IE.
  • a bolt 15 goes through a hole 18 of an eccentric 17 and the elongated slot 12.
  • the bolt 15 is screwed fast to the upper fastening plate 13 on the opposite side of the protruding part.
  • the bolt head 16 which tightens the eccentric 17 against the surface, is loosened, the eccentric 17 is turned so that the distance between the bolt 15 and an elevated part 19 increases whereupon the saw guide moves away from the body and the chain becomes tight.
  • the fastener pair 13, 14 and the saw guide 30 fastened thereto move in the direction of the arrow in Fig. IE.
  • the object of this invention is to remove the above problem and obtain a new automatic method for tightening of the chain of a cutting saw.
  • the object is also to obtain a method in which tightening of the chain takes place at regular intervals and sufficiently often.
  • the object is- also to obtain a method which will not tighten the chain too tight.
  • the eccentric is brought into such a position that the bolt strives to move in the slot away from the body of the saw, and that
  • the apparatus according to the invention is characterized in that it comprises a loaded pulling or pushing member acting on an eccentric and means for temporarily loosening and retightening tightening between the bolt head and the eccentric .
  • the pulling or pushing member acting on the eccentric is loaded with a spring, or it is hydraulically or pneumatically loaded, but in principle it may be alternatively loaded by some other means .
  • the main thing is that a proper force is made to act on the pulling or pushing member.
  • a piece whose thickness may be temporarily reduced whereupon tightening of the bolt head against the eccentric loosens letting the eccentric move by the action of the pulling or pushing member.
  • the thickness of the said piece is increased, the bolt head is retightened against the eccentric.
  • a hydraulic cylinder whose piston acts on the bolt head.
  • tightening of the bolt head against the eccentric is loosened by conducting fluid (oil) out of the hydraulic cylinder and the bolt is retightened by conducting fluid (oil) into the hydraulic cylinder.
  • Tightening of the chain is suitably performed when the harvester unit rises in an upright position after working a tree trunk.
  • the cutting saw rests and the saw guide is approximately in the horizontal plane at which position changing of the position of the saw guide relative to the body is easiest to perform.
  • the bolt is retightened before felling the next tree trunk.
  • FIG. 1A-1E show the prior art technique
  • Fig. 2A shows a detail of an apparatus according to the invention
  • Fig. 2B shows a similar detail as Fig. 2A according to an alternative embodiment of the invention
  • Fig. 3 shows a lateral cross-section of the connection of a saw guide to the body as well as another detail of an apparatus according to the invention.
  • Fig. 2A shows a protruding part 11 of the body, an eccentric 17, a bolt hole 18 in it, and an elongated slot 12 indicated with a dashed line under the piece. Attached to the eccentric is a spring-loaded roller chain 20 or a like pulling member. Reference number 26 indicates the fastening point of the roller chain and reference number
  • the roller chain 21 is a spring.
  • the roller chain is attached to the body 10 with a locking means 27.
  • the pulling force of the roller chain 20 strives to move the piece 17 in the direction of the arrow and the hole 18 with the bolt therein away from the body. Said movement is allowed when the bolt head is not tightened against the piece 17.
  • Fig. 2B shows an alternative and particularly preferable spring-loaded pulling member 20 and its locking means 27.
  • the roller chain of Fig. 2A is replaced by a bar loaded with a spring 21, which bar by its fulcrum 26 joins to the eccentric 17, which in the embodiment of Fig. 2A lies between an expansion cylinder
  • the bar 37 is rotatably connected between the ends of a locking lever 35, which lever 35, by its end nearest to the fulcrum 26, is rotatably connected with an articulated joint 34 to an extension 33 extending from the body 10.
  • Fig. 2B the locking means 27 is shown not only in its locking position (full lines) but also in its unlocking position (dashed lines).
  • the line between its articulated joint 36 and the fulcrum 26 shifts to the other side of the articulated joint at the other end of the lever 35, in other words over the dead point, and simultaneously the spring 21 is compressed causing pull on the eccentric 17 whereby the lever 35 locks in its place maintaining pull on the eccentric 17.
  • the spiral spring can be tightened to a proper pre-tightness and the spring 21 can be tightened also at intermediate times whenever necessary, when the lever 35 is in its unlocking position shown by the dashed lines .
  • Fig. 3 is a similar cross-sectional view as Fig. 1C.
  • the saw guide 30 is fastened to a pair of fastening plates 13, 14.
  • the bolt 15 passing through the elongated slot 12 and the hole 18 of the eccentric 17 is by its lower end fastened to the fastening plate 13.
  • the head 16 of the bolt 15 is a nut, which remains immobile due to a lock nut 29.
  • a hydraulic cylinder 22 provided with an outlet and intake pipe 23 for hydraulic oil, which has a through channel for the bolt 15 and whose piston 25 presses against the eccentric 17 when the cylinder is pressurized. When oil is let out through the pipe 23, pressure of the piston ceases letting the eccentric 17 move.
  • the apparatus also includes a piston locking ring not shown in greater detail.
  • the hydraulic cylinder 22 is fitted between the piece 17 and the bolt head 16 but it is obvious that, in principle, the hydraulic cylinder could be replaced by some other member whose thickness can be reduced and increased in turn approximately to the same extent as the stroke length of the above piston.
  • Tightening and loosening of the bolt could of course be carried out automatically by turning the bolt itself, by the force of the hydraulic cylinder, for example.

Abstract

The invention relates to a method for tightening a saw chain (31), particularly that of a cutting saw of the harverster, by forcing the saw guide (30) away from the saw body (10). Fastened to a fastining plate (13) of the saw guide is a bolt (15) passing through an elongated slot (12) formed in a protruding part (11) of the saw body and an eccentric (17), against which the bolt head (16) can be tightened. The position of the eccentric (17) determines the distance of the bolt (15) from the saw body. It is characteristic of the method that by means of a loaded pulling or pushing member (20) acting on the eccentric, the eccentric is brought into such a position that the bolt (15) strives to move in the slot (12) away from the saw body, and that tightening of the bolt head (16) against the eccentric (17) is temporarily loosened letting the eccentric move and shift the bolt and the equipment (13, 30, 14) attached thereto away from the saw body, and that the bolt head is retightened against the eccentric. The invention also relates to an apparatus suitable for employing the method.

Description

METHOD AND DEVICE FOR STRETCHING THE CHAIN OF A CROSSCUT SAW
The invention relates to a method and apparatus for automatically tightening the chain of a cutting saw, particularly the cutting saw of a harvester.
According to a conventional method the chain of the cutting saw of a harvester is tightened manually. This is, however, difficult because it takes time and one has to stop the harvester. Often the result is also that the chain becomes too tight. This leads to insufficient lubrication of the chain and as a consequence rapid wearing of the chain.
The present manual tightening practice is shown in Figs . 1A-1E. Fig. 1A shows, from the direction of the pulling roller, the saw body 10 and the attached saw guide 30 with its chain 31. The chain is pulled by a drive wheel 32 in the saw body which is not shown in detail. Fig. IB shows the saw body from the opposite direction. Fig. 1C shows a lateral cross-section of the body 10. In Fig. 1C the saw guide 30 is fastened to the body. The body includes a protruding part 11 with an elongated slot 12 parallel to the saw guide 30. The saw guide 30 is fastened to the body between two fastening plates 13, .14. The upper fastening plate 13 adjoining the body is provided with a groove parallel to the saw guide in which a parallel projecting part of the protruding part runs (these details are not shown in the figures). This facilitates motion of the fastening plate 13 with its attachments with respect to the protruding part.
The present manual practice to tighten the chain is best seen in Figs. ID and IE. A bolt 15 goes through a hole 18 of an eccentric 17 and the elongated slot 12. The bolt 15 is screwed fast to the upper fastening plate 13 on the opposite side of the protruding part. When it is desired to tighten the chain (in other words to push the guide 30 away from the body), the bolt head 16, which tightens the eccentric 17 against the surface, is loosened, the eccentric 17 is turned so that the distance between the bolt 15 and an elevated part 19 increases whereupon the saw guide moves away from the body and the chain becomes tight. When the said distance increases, the fastener pair 13, 14 and the saw guide 30 fastened thereto move in the direction of the arrow in Fig. IE.
There has also been an attempt to develop an automatic method for tightening the chain of a cutting saw. The method is based on conducting the desired movement of the eccentric automatically so that both tightening and loosening are carried out hydraulically . However, the method and the whole apparatus are very complicated.
The object of this invention is to remove the above problem and obtain a new automatic method for tightening of the chain of a cutting saw.
The object is also to obtain a method in which tightening of the chain takes place at regular intervals and sufficiently often. The object is- also to obtain a method which will not tighten the chain too tight.
The method according to the invention is characterized in that
- by means of a loaded pulling or pushing member acting on an eccentric, the eccentric is brought into such a position that the bolt strives to move in the slot away from the body of the saw, and that
- tightening of the bolt head against the eccentric is temporarily loosened letting the eccentric move and shift the bolt with the attached equipment away from the saw body, and that
- the bolt head is retightened against the eccentric.
The apparatus according to the invention is characterized in that it comprises a loaded pulling or pushing member acting on an eccentric and means for temporarily loosening and retightening tightening between the bolt head and the eccentric .
The saying that the bolt head is tightened against the eccentric denotes in this text that said members (the bolt head and the eccentric) may either be in direct contact with one another or there may be a connecting piece fitted between them which transmits tightening.
According to a preferred embodiment, the pulling or pushing member acting on the eccentric is loaded with a spring, or it is hydraulically or pneumatically loaded, but in principle it may be alternatively loaded by some other means . The main thing is that a proper force is made to act on the pulling or pushing member.
According to a recommended embodiment, between the bolt head and the eccentric is fitted a piece whose thickness may be temporarily reduced whereupon tightening of the bolt head against the eccentric loosens letting the eccentric move by the action of the pulling or pushing member. When the thickness of the said piece is increased, the bolt head is retightened against the eccentric.
According to a particularly recommended embodiment, between the bolt head and the eccentric is fitted a hydraulic cylinder whose piston acts on the bolt head. In this case tightening of the bolt head against the eccentric is loosened by conducting fluid (oil) out of the hydraulic cylinder and the bolt is retightened by conducting fluid (oil) into the hydraulic cylinder.
Tightening of the chain is suitably performed when the harvester unit rises in an upright position after working a tree trunk. In this situation the cutting saw rests and the saw guide is approximately in the horizontal plane at which position changing of the position of the saw guide relative to the body is easiest to perform. The bolt is retightened before felling the next tree trunk.
Automation of the method is easy. When the harvester unit turns into a vertical position, an electric signal is sent to a valve which lets oil out of the hydraulic cylinder. This halts compression of the piston of the hydraulic cylinder towards the bolt head letting the eccentric move. At a suitable moment, oil is introduced into the cylinder restarting compression of the piston towards the bolt head and locking the eccentric in its place.
The major advantages of the method are - easy automation
- simple structure resistant to service conditions
- tightening of the chain takes place sufficiently often, i.e. after working of each tree trunk, and
- tightening of the chain is performed with a suitable constant force.
In the following the invention is described referring to the enclosed drawings in which:
Figs. 1A-1E show the prior art technique, Fig. 2A shows a detail of an apparatus according to the invention,
Fig. 2B shows a similar detail as Fig. 2A according to an alternative embodiment of the invention, and Fig. 3 shows a lateral cross-section of the connection of a saw guide to the body as well as another detail of an apparatus according to the invention.
Fig. 2A shows a protruding part 11 of the body, an eccentric 17, a bolt hole 18 in it, and an elongated slot 12 indicated with a dashed line under the piece. Attached to the eccentric is a spring-loaded roller chain 20 or a like pulling member. Reference number 26 indicates the fastening point of the roller chain and reference number
21 is a spring. The roller chain is attached to the body 10 with a locking means 27. The pulling force of the roller chain 20 strives to move the piece 17 in the direction of the arrow and the hole 18 with the bolt therein away from the body. Said movement is allowed when the bolt head is not tightened against the piece 17.
Fig. 2B shows an alternative and particularly preferable spring-loaded pulling member 20 and its locking means 27. In this embodiment, the roller chain of Fig. 2A is replaced by a bar loaded with a spring 21, which bar by its fulcrum 26 joins to the eccentric 17, which in the embodiment of Fig. 2A lies between an expansion cylinder
22 and the protruding part 11 of the body. At the opposite end of the bar 37 is an adjuster bolt 38 by which the spring, fitted around the bar 37, is compressed between the adjuster bolt 38 and the articulated joint 36 between the ends of the bar 37. By its articulated joint 36 the bar 37 is rotatably connected between the ends of a locking lever 35, which lever 35, by its end nearest to the fulcrum 26, is rotatably connected with an articulated joint 34 to an extension 33 extending from the body 10.
In Fig. 2B the locking means 27 is shown not only in its locking position (full lines) but also in its unlocking position (dashed lines). When the lever 35 is shifted from the unlocking position to the locking position, the line between its articulated joint 36 and the fulcrum 26 shifts to the other side of the articulated joint at the other end of the lever 35, in other words over the dead point, and simultaneously the spring 21 is compressed causing pull on the eccentric 17 whereby the lever 35 locks in its place maintaining pull on the eccentric 17.
By means of the adjuster bolt 38 the spiral spring can be tightened to a proper pre-tightness and the spring 21 can be tightened also at intermediate times whenever necessary, when the lever 35 is in its unlocking position shown by the dashed lines .
Fig. 3 is a similar cross-sectional view as Fig. 1C. The saw guide 30 is fastened to a pair of fastening plates 13, 14. The bolt 15 passing through the elongated slot 12 and the hole 18 of the eccentric 17 is by its lower end fastened to the fastening plate 13. The head 16 of the bolt 15 is a nut, which remains immobile due to a lock nut 29. Between the eccentric 17 and the nut 16 is fitted a hydraulic cylinder 22 provided with an outlet and intake pipe 23 for hydraulic oil, which has a through channel for the bolt 15 and whose piston 25 presses against the eccentric 17 when the cylinder is pressurized. When oil is let out through the pipe 23, pressure of the piston ceases letting the eccentric 17 move. Addition of oil through the pipe 23 leads to retightening. Pressurized oil is taken from a precontrol conduit of the hydraulic valve where the pressure is about 35 bar. The stroke length of the piston in this application is only about 0 , 5 mm but it is enough to obtain loosening and tightening. Reference number 24 indicates oil retaining rings. The apparatus also includes a piston locking ring not shown in greater detail. In the example described above the hydraulic cylinder 22 is fitted between the piece 17 and the bolt head 16 but it is obvious that, in principle, the hydraulic cylinder could be replaced by some other member whose thickness can be reduced and increased in turn approximately to the same extent as the stroke length of the above piston.
Tightening and loosening of the bolt could of course be carried out automatically by turning the bolt itself, by the force of the hydraulic cylinder, for example.
Apart from harvesters the invention is applicable also in other saws .
It is obvious to a specialist in the field that different embodiments of the invention may vary within the limits of the following claims.

Claims

1. A method for tightening a saw chain (31), particularly that of a cutting saw of a harvester, by forcing the saw guide (30) away from the saw body (10), there being a bolt (15) fastened to a fastening plate (13) of the saw guide passing through an elongated slot (12) formed in a protruding part (11) of the saw body and an eccentric (17), against which the bolt head (16) can be tightened, and wherein the position of the eccentric (17) determines the distance of the bolt (15) from the saw body, characterized in that
- by means of a loaded pulling or pushing member (20) acting on the eccentric, the eccentric is brought into such a position that the bolt (15) strives to move in the slot (12) away from the saw body, and that
- tightening of the bolt head (16) against the eccentric (17) is temporarily loosened letting the eccentric move and shift the bolt and the attached equipment (13, 30, 14) away from the saw body, and that - the bolt head is retightened against the eccentric.
2. The method according to claim 1, characterized in that tightening of the bolt is temporarily loosened by reducing the thickness of a piece (22) fitted between the bolt head (16) and the eccentric (17).
3. The method according to claim 2, characterized in that the piece (22) fitted between the bolt head (16) and the eccentric (17) is a hydraulic cylinder whose piston (25) acts in the direction of the bolt, and that tightening of the bolt against the eccentric is loosened by conducting fluid out of the hydraulic cylinder (22), and that the bolt is retightened by conducting fluid into the hydraulic cylinder.
4. The method according to any of the claims 1-3, characterized in that tightening of the bolt against the eccentric is loosened when the harvester unit rises in an upright position after working a tree trunk and that the bolt is retightened before felling the next tree trunk.
5. An apparatus for tightening the chain (31) of a cutting saw, particularly that of a harvester, comprising
- a bolt (15) fastened to a fastening plate (13) of the saw guide passing through an elongated slot (12) formed in a protruding part (11) of the saw body and also an eccentric (17) against which the bolt head (16) can be tightened, and wherein the position of the eccentric (17) determines the distance of the bolt (15) from the saw body, characterized in that the apparatus further comprises
- a loaded pulling or pushing member (20) acting on the eccentric, and
- means for temporarily loosening and retightening tightening between the bolt head (16) and the eccentric.
6. The apparatus according to claim 5, characterized in that a piece (22) is fitted between the bolt head (16) and the eccentric (17) whose thickness can be temporarily reduced for loosening tightening between the bolt and the eccentric.
7. The apparatus according to claim 6, characterized in that the piece (22) fitted between the bolt head (16) and the eccentric (17) is a hydraulic cylinder provided with fluid intake and outlet pipes (23, 24) whose piston (25) acts in the direction of the bolt.
8. The apparatus according to any of the claims 5-7, characterized in that the pulling member (20) is an elongated bar (37) loaded with a spiral spring (21) and by its one end rotatably mounted (26) to the eccentric (17), and that it further comprises a locking means (27) mounted with an articulated joint to the body (10) and including a locking lever (35) whose one end (34), which is situated on the same side as the fulcrum (26) of the bar (37), is rotatably mounted to the body (10), and which has a second articulated joint (36) between its ends by which it is rotatably mounted between the ends of the bar (37) for loading the spiral spring (21), when the lever (35) is forced towards the body (10) over the dead point formed by the articulated joints (26, 36, 34) for locking the pulling member (20).
PCT/FI1998/000048 1997-01-30 1998-01-21 Method and device for stretching the chain of a crosscut saw WO1998033631A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU56665/98A AU5666598A (en) 1997-01-30 1998-01-21 Method and device for stretching the chain of a crosscut saw

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI970391A FI101353B (en) 1997-01-30 1997-01-30 Method and apparatus for tightening the chain of a cutting saw
FI970391 1997-01-30

Publications (1)

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WO1998033631A1 true WO1998033631A1 (en) 1998-08-06

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PCT/FI1998/000048 WO1998033631A1 (en) 1997-01-30 1998-01-21 Method and device for stretching the chain of a crosscut saw

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AU (1) AU5666598A (en)
FI (1) FI101353B (en)
WO (1) WO1998033631A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6564459B1 (en) 1999-07-07 2003-05-20 Robert Bosch Gmbh Chain saw
US6782627B2 (en) 1999-12-29 2004-08-31 Robert Bosch Gmbh Chain saw
EP1764197A2 (en) 2005-08-03 2007-03-21 Robert Bosch Gmbh Chainsaw with tensioning mechanism
WO2010069253A1 (en) 2008-12-16 2010-06-24 苏州宝时得电动工具有限公司 Chain saw
EP2933074B1 (en) * 2014-04-14 2021-05-19 TP Silva Oy Firewood processor with a tightenable saw chain

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636995A (en) * 1970-07-02 1972-01-25 Textron Inc Tensioner for saw chain
US4129943A (en) * 1977-11-25 1978-12-19 Bricker Norman C Chain saw bar tightener
US5491899A (en) * 1992-06-25 1996-02-20 Stihl Andreas Tensioning arrangement for a saw chain

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3636995A (en) * 1970-07-02 1972-01-25 Textron Inc Tensioner for saw chain
US4129943A (en) * 1977-11-25 1978-12-19 Bricker Norman C Chain saw bar tightener
US5491899A (en) * 1992-06-25 1996-02-20 Stihl Andreas Tensioning arrangement for a saw chain

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6564459B1 (en) 1999-07-07 2003-05-20 Robert Bosch Gmbh Chain saw
US6782627B2 (en) 1999-12-29 2004-08-31 Robert Bosch Gmbh Chain saw
EP1764197A2 (en) 2005-08-03 2007-03-21 Robert Bosch Gmbh Chainsaw with tensioning mechanism
WO2010069253A1 (en) 2008-12-16 2010-06-24 苏州宝时得电动工具有限公司 Chain saw
US9878463B2 (en) 2008-12-16 2018-01-30 Positec Power Tools (Suzhou) Co., Ltd Chain saw
EP2933074B1 (en) * 2014-04-14 2021-05-19 TP Silva Oy Firewood processor with a tightenable saw chain

Also Published As

Publication number Publication date
FI101353B1 (en) 1998-06-15
FI101353B (en) 1998-06-15
AU5666598A (en) 1998-08-25
FI970391A0 (en) 1997-01-30

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