EP0878279A1 - Kettensäge mit Sägekettenspann- und Bremsvorrichtung - Google Patents

Kettensäge mit Sägekettenspann- und Bremsvorrichtung Download PDF

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Publication number
EP0878279A1
EP0878279A1 EP98108135A EP98108135A EP0878279A1 EP 0878279 A1 EP0878279 A1 EP 0878279A1 EP 98108135 A EP98108135 A EP 98108135A EP 98108135 A EP98108135 A EP 98108135A EP 0878279 A1 EP0878279 A1 EP 0878279A1
Authority
EP
European Patent Office
Prior art keywords
plate
chain
chainsaw
arm
chain guide
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Withdrawn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
EP98108135A
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English (en)
French (fr)
Inventor
Bernard Barbe
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0878279A1 publication Critical patent/EP0878279A1/de
Withdrawn legal-status Critical Current

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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
    • 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 present invention relates to a chain tensioning and safety mechanism for chainsaw, comprising a motor which drives by means of the crankshaft a centrifugal clutch which includes a rotor on its outer part, then a chain mounted on a guide, the motor housing of which carries the mechanism , object of the present, allowing an automatic and permanent tension of the chain and a spontaneous stop of its rotation as soon as it has a waiting position.
  • the chain tensioning system is carried out manually, whenever necessary, by tightening a nut on a screw.
  • the screw is secured by its head to the housing and passes through the central and longitudinal opening of the chain guide, the latter transmits the tension under the tightening of the nut.
  • This adjustment means is tedious and causes loss of time, given that the frequency of the adjustments is proportional to the use of the chainsaw.
  • the minimum safety measure, to reduce accidents, imposed for a decade aims to stop the chain in the event of a fall on the front of the user. This stop is caused by the tilting on the front of a wrist located between the engine and the chain guide, which handle pulls with appropriate means on a strap which surrounds the rotor.
  • a major drawback of this safety means is that the chain stops, when using the device, only in extreme situations, for example during a fall and provided that said handle is maneuvered.
  • the object of the present invention is to remedy these drawbacks.
  • the invention that it is presented allows automatic and continuous adjustment of the tension of the chain, without manual user intervention and regardless of the importance of use of the appliance.
  • security it is greatly increased by the mechanism of the present invention, in that the saw chain is stopped as soon as the user stop sawing, that is to say as soon as the chain no longer attacks the wood, even if the latter is still placed in the saw slot.
  • This security is particularly effective, when the user moves by pivoting for example to go from one trunk to another, to saw.
  • the numerous chain stops are automatic , without human intervention, and the rotation resumes as soon as the chain is supported on sawn wood.
  • the invention relates to chainsaws operating with a heat engine which transmits the movement, outside the casing, through the crankshaft , to a centrifugal clutch which has a rotor, the mechanism of which is present, is characterized in that it comprises a first plate attached to a face of the casing, chain side of the chainsaw, which plate has an opening circular for the passage of the crankshaft through a bearing needle, and opposite in the center alignment of the crankshaft, the first plate has a longitudinal opening and curved so that it allow oscillation on the casing, whose travel is limited; and when oscillation down or up, the first plate drives through its elements the other organs, namely: a chain guide, a second plate which carries the elements for the chain tension and a rotor clamping means provided with articulated arms which activate a circular part; which organs cooperate together to control the chain placed on the chain guide.
  • the particularity of the oscillation of the chain guide gives more flexibility to sawing, given that the guide absorbs a large proportion of the vibrations caused by the chain.
  • the first plate has a substantially trapezoidal shape and is held, without immobilization, against the casing by means of a large-head screw, by the curved oscillation opening, which oscillatory movement of the first plate plays a very important role for the operation of the mechanism, object of the invention. On this first plate comes to position one end of the chain guide so that the pins of the first plate are housed in the longitudinal opening of the median axis of the chain guide.
  • the second plate shorter, cooperating mainly for the tension of the chain, is positioned on the end of the chain guide, opposite and parallel to the first plate, by two holes coming from the two pins already mentioned of the first plate.
  • the second plate carries a lateral stud, on the opposite face of the chain guide, which lateral stud is movable in a slide and fits by its outer part in a lateral hole of the chain guide to secure the latter, in order to obtain the tension required for the chain.
  • the other face of the second plate carries a chain tension piece which has a flat and triangular shape, which tension piece moves in a slide and is animated by its rear part, by an articulated arm subjected to the traction of a spring .
  • the inside of the slide indicated above corresponds vis-à-vis with the inside of the slide, so that th lateral nipple which is naturally brought back towards the crankshaft, by means of the chain which turns on the guide and said crankshaft, is pushed in opposite direction in its slide by the oblique edge of the tension piece and this causes the distance of the chain guide relative to the output of the crankshaft.
  • the spring indirectly tightens the chain through the triangular piece and its traction gives permanent tension, despite meeting unforeseen obstacles during sawing work.
  • This second plate carries a small threaded rod, on the face opposite the means and opposite the rotor of the chainsaw, which rod has mid-height a support ring for positioning small tie rods, through oval lights, which tie rods connect the same arm of the rotor clamping means.
  • the safety means comprises two arms placed at the level of the rotor, one of which is bent and pivots in its elbow on the casing.
  • the bent arm has one end biased by a spring and its other end pulls a rod which extends the circular part at one end.
  • the circular part surrounding the rotor is interrupted in one place and one of its two ends is extended by a threaded rod and the other end has an element for being apprehended by said rod.
  • the threaded rod passes through a small cylindrical tube housed in the other end of the circular part which is carried by an arm, then crosses the neighboring end of a second arm, on which it is held by any suitable means.
  • the circular part which circles the rotor and causes the chain to stop at each sawing interruption, for safety is made of a material such as Teflon which offers great resistance to wear and flexibility of implementation.
  • Teflon which offers great resistance to wear and flexibility of implementation.
  • the mechanism of the present invention adapts to chainsaws, without changing the principle, regardless of the order of arrangement of the parts with respect to the chain guide, whether the latter is, for example, placed before or after the rotor.
  • the figures represent a chain tensioning and safety system for chainsaw powered by a heat engine and provided with at least one crankshaft which drives by means of a shaft a rotor, comprising a first trapezoidal plate 1 backed by one face on one side 2 of the casing 3, chain guide side (fig. 1,2,3 and 4).
  • This first plate 1 has on one end, in its median axis, an opening circular 4 for the passage of the shaft 5 of the crankshaft, and on the opposite, on the opposite the guide bar, always in the same median alignment, two nipples 6 and 7 for setting the following elements such as the chain guide 8 and the second platinum 9.
  • the plate 1 has a curved window 10, through which it is held against the housing by means of a large head screw 11, the latter is screwed on the face 2 of the casing so as to hold the plate 1, without immobilizing it.
  • the plate 1 oscillates by a female shoulder on a trunk shoulder, which shoulders respectively surround a circular opening 4 for the passage of the crankshaft 5, by means of a needle bearing or a ring in Teflon due to very low wear.
  • the oscillation of the first deck 1, which drives the other elements, is one of the main features of the invention, as explained below.
  • the face of the first plate 1, facing the chain guide has four shoulders 13 arranged in an appropriate manner, around the arched window 10, to allow the support of the chain guide 8 without touching the head 11 of the screw, which would harm or even block the oscillatory movement of the first stage.
  • the end of the chain guide is positioned by its longitudinal opening 15 on the two pins 6 and 7 which pass through said opening.
  • the chain 16 with cutting links extends beyond the chain guide 8 and is driven by a circular part 17 mounted on the crankshaft 5 and actuated by the latter.
  • the two pins 6 and 7 pass through the chain guide, as described above, and extend beyond to receive the second plate 9 by two holes 18 and 18 'made on the median axis of the latter (fig. 7).
  • the plate 9 mainly plays a role in the tension of the chain and cooperates for the safety stop of the chain.
  • the plate 9 has substantially the same size as the plate 1, in the width direction and along the length it stops under the periphery of the rotor 19, the latter being placed on the crankshaft 5 by means of a needle bearing 12.
  • the stud 6, of the plate 1, is just long enough so that its end is housed in the hole 18 'of the second plate 9, without exceeding it, while the stud 7 extends beyond and has a thread 20 on its end to hold the plate 9 in place with a nut.
  • the plate 9 carries, on the face looking at the rotor (fig.
  • the two sides 24 of the slide 21 are oblique and have the same angle as the tension piece 23, but their spacing is equal to the widest part of said tension piece, so that the tension piece cannot come out completely of his accommodation.
  • the sliding direction of the tension piece 23 is transverse to the direction of rotation of the chain, and said tension piece is operated by its top, by the end of an arm 25 which pivots by a small axis 26 on the plate 9.
  • the arm 25 is permanently returned to its rear end 27 by a coil spring 28 which is held by its other end on the plate 9 with any suitable means.
  • the plate 9 has, on the face opposite the chain guide (fig. 5, 6), an opening longitudinal 29 which is partially opposite the slide 21, in which opening slides a stud 30 projecting to secure the chain guide.
  • the nipple 30 is maintained in the opening by a perpendicular foot 31 housed in a space 32 formed in the extension of the slide 21.
  • the space 32 and the mortise 22 of the slide communicate partially so as to allow passage of the stud 30.
  • the part outside of the stud 30 is housed in a lateral hole 33 of the chain guide.
  • the opening 29 partially opens on the slide 21 and is perpendicular in the sense of said slide allowing the stud 30 to be in contact with the edge 34 of the tension piece.
  • the edges 34 of the tension piece 23 are oblique and decline from the slide 21 towards the rear corresponding to the apex, by which apex said tension piece 23 is animated.
  • the coil spring 28 naturally pulls on the arm 25 and the latter by pivoting forces the recoil in the slide 21, of the piece of tension 23, which by its oblique edge 34 progressively goes up the stud 30 towards the front of the chainsaw. That is to say that the stud 30 in its displacement moves away the chain guide 8 of the crankshaft 5, giving tension to the chain.
  • the face of the plate 9, facing the chain guide, includes an extension 14 in its middle to create a clearance on its two lateral sides with respect to the rotation of the chain itself and to avoid the formation of jamming with wood particles.
  • the stop means consists of an unclosed circular piece 42 which is placed around the circumference of the rotor .
  • the circular part 42 has on its inner circumference brake pads 36 and is animated with movable arms 35 and 40.
  • the safety elements comprise an arm 35 bent at mid-length, forming an approximate angle of 60 °, which arm 35 is positioned on the left of the rotor 19 and substantially on the same plane, and is held on the casing by its elbow 37 by means of a pin 39 and a screw 38 (figs. 9 and 11).
  • the pin 39 joins the elbow of the arm 35 with the end of another arm 40, so as to allow an oscillation of the two arms on the casing.
  • the arm 35 is composed of two parts of flat shape and slightly curved so as to bypass the circular part 42 which encloses the rotor.
  • the part of the arm 35 placed on the housing side, has at its end a hole in which is blocked a threaded rod 41 secured to the circular part 42 which encircles the rotor 19 and the other part of said arm 35, is found in a transverse position to the chain guide.
  • the transverse part of the arm 35 is moved at two different points by two tie rods 44 and 45 which join, at their other end, by ovoid slots on a small rod 43 which is carried by the second plate 9.
  • tie rod 44 When pressure is exerted with the lower strand of the chain, on wood, it is the tie rod 44 which releases the rotor and conversely, when the pressure is produced with the upper strand it is the tie rod 45 which pulls on arm 35, to deliver 4th rotor.
  • the end of the transverse part of the arm 35, close to the tie rods has a protuberance for retaining the end of a spring 52, which has its other end fixed by a hook on a lug 46 located on the side of the casing, which lug 46 is fixed on the latter by any appropriate means.
  • This tab 46 carries a lug which makes it possible to pivot it manually, on an axis 47, allowing it to travel an angle of approximately 200 °, up to a stop 48 for stopping and blocking, which prevents any unexpected reversal on the 'back .
  • the second arm 40 of rectilinear and flat shape is disposed on the part of the arm 35, housing side, and has a circular opening at its end through which a tube passes 49 retained on said arm 40 by the periphery of a cap 50 (FIG. 10).
  • the tube 49 fits in a cylindrical housing 51 formed by the inversion of one of the two ends of the circular piece 42 and the other end of the latter is extended by the rod 41.
  • the rod 41 passes through, through concordant holes and provided for this purpose, at first, the cylindrical housing 51 and the tube 49 then is blocked on the adjacent end of the arm 35 with a nut.
  • the end of the arm 35 has a rounded shape to match the circumference of the cylindrical housing 51 in order to provide good rod retainer 41.
  • the chain guide 8 In the standby position, in other words when the chainsaw is not sawing, the chain guide 8 is positioned on a median alignment with respect to its two working positions, that is to say at equal distance between its high position and its low position .
  • This middle or waiting position is maintained by the traction of the spring 52 by means of the arm 35 and the plate 9.
  • the spring 52 exerts a traction on the end of the arm 35 which pivots on the casing, at its elbow 37 and by this movement the other part of said arm 35 pulls by its end on the rod 41, causing the tightening of the circular part 42 around the rotor which quite naturally stops the rotation of the chain.
  • the casing 3 carries two buffers 54 in Teflon, which are fitted on the said casing, to avoid possible wear caused by the friction of the first plate during its oscillation on the casing.
  • the plate 1 has an orifice 55 positioned at a suitable location for lubricating the chain guide.
  • Manual pressure on a lug 57 which is fixed on the arm 25, causes the tension piece 23 to advance in the slide and has the effect of bringing the chain guide closer to the crankshaft shaft and therefore of reducing the tension of chain ; this maneuver facilitates the installation and removal of the chain.
  • the rotor 19 is located before the chain guide 8, in the order of arrangement of the parts on the casing 3 of the chainsaw (fig. 12); in the latter case, the rotor is presented so that its face faces the first plate.
  • the second plate 9 is juxtaposed, identically to the first embodiment, against the chain guide.
  • the plate 1 carries two transverse spacers 58 in Teflon, replacing the four shoulders 13, for better seating of the chain guide. These spacers have a sufficient height to exceed the thickness of the rotor to allow the support of the chain guide.
  • the chain guide and the second plate are held, by the first plate 1, by means of two threaded rods 59 and 60 which pass through the longitudinal opening 15, as in the first exemplary embodiment.
  • the rods 59 and 60 extend beyond the guide and have respectively a shoulder 61 and 62 for the support of the second plate and the latter is immobilized with nuts.
  • the elements for stopping the chain are placed around the rotor, between the plate 1 and the chain guide 8.
  • the two tie rods 44 and 45 (not shown in fig. 12) to circle, the rotor works in the same way as in the first example and are held by one end on the transverse arm and by the other end on the same threaded rod 59.
  • the tie rods respectively comprise an ovoid light which gives the clearance necessary for the tightening of the circular part.
  • the arm 40 is omitted and the end of the circular part 42 is preferably directly immobilized on the casing by means of a cylindrical part , by any appropriate means.
  • the invention is more particularly intended for chainsaws operated with heat engines or with electric motors.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
EP98108135A 1997-05-06 1998-05-05 Kettensäge mit Sägekettenspann- und Bremsvorrichtung Withdrawn EP0878279A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR9705710A FR2763013B1 (fr) 1997-05-06 1997-05-06 Mecanisme de tension de chaine et de securite pour tronconneuse
FR9705710 1997-05-06

Publications (1)

Publication Number Publication Date
EP0878279A1 true EP0878279A1 (de) 1998-11-18

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Application Number Title Priority Date Filing Date
EP98108135A Withdrawn EP0878279A1 (de) 1997-05-06 1998-05-05 Kettensäge mit Sägekettenspann- und Bremsvorrichtung

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EP (1) EP0878279A1 (de)
FR (1) FR2763013B1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2353812A1 (de) * 2010-01-28 2011-08-10 Maruyama MFG. Co., Inc. Kettensäge
US10882206B2 (en) 2015-08-18 2021-01-05 Black & Decker, Inc. Low profile chainsaw

Citations (1)

* 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

Patent Citations (1)

* 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

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2353812A1 (de) * 2010-01-28 2011-08-10 Maruyama MFG. Co., Inc. Kettensäge
US8549761B2 (en) 2010-01-28 2013-10-08 Maruyama Mfg. Co. Inc. Chain saw
US10882206B2 (en) 2015-08-18 2021-01-05 Black & Decker, Inc. Low profile chainsaw

Also Published As

Publication number Publication date
FR2763013B1 (fr) 1999-07-16
FR2763013A1 (fr) 1998-11-13

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