WO2016139637A1 - Chaîne de tronçonneuse différentielle - Google Patents

Chaîne de tronçonneuse différentielle Download PDF

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Publication number
WO2016139637A1
WO2016139637A1 PCT/IB2016/051238 IB2016051238W WO2016139637A1 WO 2016139637 A1 WO2016139637 A1 WO 2016139637A1 IB 2016051238 W IB2016051238 W IB 2016051238W WO 2016139637 A1 WO2016139637 A1 WO 2016139637A1
Authority
WO
WIPO (PCT)
Prior art keywords
links
cutter
link
chain
center drive
Prior art date
Application number
PCT/IB2016/051238
Other languages
English (en)
Inventor
Niklas SARIUS
Hans-Åke SUNDBERG
Hasse Lilja
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 WO2016139637A1 publication Critical patent/WO2016139637A1/fr

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
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • 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
    • B27B33/00—Sawing tools for saw mills, sawing machines, or sawing devices
    • B27B33/14—Saw chains
    • B27B33/141—Saw chains with means to control the depth of cut

Definitions

  • Example embodiments generally relate to hand held power equipment and, more particularly, relate to cutting chain improvements for a chainsaw.
  • Chainsaws are commonly used in both commercial and private settings to cut timber or perform other rigorous cutting operations. Because chainsaws are typically employed in outdoor environments, and the work they are employed to perform often inherently generates debris, chainsaws are typically relatively robust hand held machines. They can be powered by gasoline engines or electric motors (e.g., via batteries or wired connections) to turn a chain around a guide bar at relatively high speeds.
  • the chain includes cutting teeth that engage lumber or another medium in order to cut the medium as the teeth are passed over a surface of the medium at high speed.
  • Some example embodiments may provide for a chainsaw chain constructed with a differential chain.
  • the differential chain may improve cutting efficiency and minimize the energy required for executing the cutting procedure.
  • Other improvements may also be possible, and the improvements can be made completely independent of each other, or in combination with each other in any desirable configuration. Accordingly, the operability and utility of the chainsaw may be enhanced or otherwise facilitated.
  • FIG. 1 illustrates a side view of a chainsaw according to an example embodiment
  • FIG. 2 illustrates a side view of a chainsaw guide bar that does not employ a differential chain according to an example embodiment
  • FIG. 3 illustrates a side view of a differential chain in accordance with an example embodiment.
  • FIG. 1 illustrates side view of a chainsaw 100 according to an example embodiment.
  • the chainsaw 100 may include a housing 110 inside which a power unit or motor (not shown) is housed.
  • the power unit may be either an electric motor or an internal combustion engine.
  • the power unit may include more than one electric motor where one such electric motor powers the working assembly of the chainsaw 100 and the other electric motor of the power unit powers a pump that lubricates the working assembly or provides momentum for moving other working fluids within the chainsaw 100.
  • the chainsaw 100 may further include a guide bar 120 that is attached to the housing 110 along one side thereof.
  • a chain (not shown) may be driven around the guide bar 120 responsive to operation of the power unit in order to enable the chainsaw 100 to cut lumber or other materials.
  • the guide bar 120 and the chain may form the working assembly of the chainsaw 100.
  • the power unit may be operably coupled to the working assembly to turn the chain around the guide bar 120.
  • the chainsaw 100 may include a front handle 130 and a rear handle 132.
  • a chain brake and front hand guard 134 may be positioned forward of the front handle 130 to stop the movement of the chain 122 in the event of a kickback.
  • the hand guard 134 may be tripped by rotating forward in response to contact with a portion of the arm (e.g., the hand/wrist) of the operator of the chainsaw 100.
  • the hand guard 134 may also be tripped in response to detection of inertial measurements indicative of a kickback.
  • the rear handle 132 may include a trigger 136 to facilitate operation of the power unit when the trigger 136 is actuated.
  • the rotating forces generated by the power unit may be coupled to the chain either directly (e.g., for electric motors) or indirectly (e.g., for gasoline engines).
  • the term "trigger,” as used herein, should be understood to represent any actuator that is capable of being operated by a hand or finger of the user.
  • the trigger 136 may represent a button, switch, or other such component that can be actuated by a hand or portion thereof.
  • Some power units may employ a clutch to provide operable coupling of the power unit to a sprocket that turns the chain.
  • a clutch to provide operable coupling of the power unit to a sprocket that turns the chain.
  • the trigger 136 if the trigger 136 is released, the engine may idle and application of power from the power unit to turn the chain may be stopped. In other cases (e.g., for electric motors), releasing the trigger 136 may secure operation of the power unit.
  • the housing 110 may include a fuel tank for providing fuel to the power unit.
  • the housing 110 may also include or at least partially define an oil reservoir, access to which may be provided to allow the operator to pour oil into the oil reservoir. The oil in the oil reservoir may be used to lubricate the chain as the chain is turned.
  • a clutch cover 150 may be provided to secure the guide bar 120 to the housing 110 and cover over the clutch and corresponding components that couple the power unit to the chain (e.g., the sprocket and clutch drum). As shown in FIG. 1, the clutch cover 150 may be attached to the body of the chainsaw 100 (e.g., the housing 110) via nuts 152 that may be attached to studs that pass through a portion of the guide bar 120. The guide bar 120 may also be secured with the tightening of the nuts 152, and a tightness of the chain can be adjusted based on movement of the guide bar 120 and subsequent tightening of the nuts 152 when the desired chain tightness is achieved.
  • other mechanisms for attachment of the clutch cover 150 and/or the guide bar 120 may be provided in other embodiments including, for example, some tightening mechanisms that may combine to tighten the chain in connection with clamping the guide bar 120.
  • the guide bar 120 may be formed from two laminate core sheets that lie in parallel planes along side each other to define a channel around a periphery of the guide bar 120.
  • the chain (or at least a portion of the chain) may ride in the channel, as the rest of the chain rides along the periphery of the guide bar 120 to engage media for cutting.
  • FIG. 2 illustrates a typical chain 200 disposed on the guide bar 120.
  • the chain 200 includes a plurality of center drive links 210 that each include a portion thereof that rides in the channel.
  • Each center drive link 210 is attached to an adjacent pair of side links 220 by rivets 230 that extend perpendicular to the longitudinal length of the links.
  • a rivet 230 is provided at the front portion of each center drive link 210 to attach the center drive link 210 to the rear portion of a preceding side links 220 and another rivet 230 is provided at the rear portion of each center drive link 210 to attach the center drive link 210 to the front portion of a subsequent side links 220.
  • each pair of side links 220 connects to opposing sides of the center drive links 210, and the connections are repeated in alternating fashion to complete a circular or endless chain.
  • one of the side links may be formed as a cutter link 240.
  • pairs of side links that do not include a cutter link 240 may be referred to as tie links 250.
  • the cutter links 240 may be provided with two portions including a depth gauge portion 260 and a cutting portion 270.
  • the cutting portion 270 may generally engage material that extends beyond the depth of the depth gauge portion 260 when the chain 200 is rotated.
  • the tie links 250 may not include cutting portions or depth gauge portions and may be provided to simply extend the length of the chain 200 while providing a space between portions of the chain 200 that will create friction during cutting operations. If every side link 220 included a cutter link 240, the friction on the chain 200 would be very high, and it would be difficult to provide sufficient power to turn the chain, and control of the chainsaw 100 could also become difficult.
  • the cutter links 240 typically have the cutting portion 270 extend along one side or the other of the link (e.g., as a side plate) and then bend over to form a top plate.
  • the cutter links 240 that have the side plate along the left side of the link may be referred to as left cutter links, and the cutter links 240 that have the side plate on the right side of the link may be referred to as right cutter links.
  • the cutter links 240 are alternated between left cutter links and right cutter links.
  • the spacing between cutter links 240 which may be determined by the number of tie links 250 placed between cutter links 240, may be consistent or vary in different examples. However, in any case, a repeated pattern is generally provided.
  • the pattern may essentially be R-T-L-T ..., as shown in the example of FIG. 2. This pattern may repeat over the entire length of the chain 200. However, in other cases, such as where two tie links are provided between cutter links, the pattern may look like R-T-T-L-T-T ... . Any number of tie links could be provided between alternating cutter links.
  • the number of tie links could vary between cutter links.
  • a pattern of R-T-L-T-T ... could be provided or L-T-R-T-T ... .
  • the general rule is that alternating cutter links are on opposing sides of each other relative to the ordering of links around the chain 200.
  • a differential chain 300 is provided in which that ordering is differentiated.
  • the differential chain 300 provides for improved cutting efficiency.
  • the differential chain 300 therefore provides different combinations of segments of cutter links in an effort to optimize the cutting procedure with the use of as little energy as possible.
  • the differential chain 300 may also facilitate ensuring that the energy that is expended is more efficiently applied to the cutting procedure by reducing the amount of energy that does not go into the cutting process or contribute to cutting efficiency. As a result, less energy may be required in order to cut, and more effective cutting may be achieved.
  • differential chain 300 arrangements may include T-L-R-T-T-L-T- T-R ... L-T-R-L-T-R-T-T-L-T-R-T ...L-L-T-T-R-T-T L-T-L-T-R-T-R-T and L-T- T-L-T-R-T-T-R-T ... .
  • the number of tie links in the differential chain 300 can either be the same between each alternating cutting link or different.
  • the typical pattern of left and right cutters being alternated with a selected number of links in between is, in any case, modified to create the differential chain 300.
  • a cutting chain of an example embodiment may include a plurality of center drive links, and a plurality of side links attached to the center drive links in alternating fashion via rivets. At least some of the side links are cutter links having a cutting portion disposed on a left side or a right side thereof. Cutter links having the cutting portion on the right side are right cutter links and cutter links having the cutting portion on the left side thereof are left cutter links.
  • the chain includes at least one right cutter link for which a next cutter link is another right cutter link, or at least one left cutter link for which the next cutter link is another left cutter link.
  • a predetermined number of tie links may be disposed between alternating cutter links. In an example embodiment, a different number of tie links may be disposed between at least some pairs of alternating cutter links. In some embodiments, at least one cutter link may be separated from another cutter link by a center drive link without any tie link therebetween. In an example embodiment, the cutter links may each include a depth gauge portion provided thereon. In some cases, at least one depth gauge portion of at least one cutter link overlaps with a depth gauge portion provided at a corresponding center drive link. In an example embodiment, at least two tie links are provided between at least one set of adjacent cutter links. In some embodiments, a center drive link between the at least two tie links does not include a depth gauge portion. In an example embodiment, a depth gauge portion is included on each center drive link preceding a cutter link and is not included on each center drive link following any cutter link.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)

Abstract

L'invention concerne une chaîne de coupe (300) pour une tronçonneuse (100) pouvant comprendre une pluralité de maillons d'entraînement centraux (210) et une pluralité de maillons latéraux (220) fixés aux maillons d'entraînement centraux (210) de manière alternée par l'intermédiaire de rivets. Au moins certains des maillons latéraux (220) sont des maillons de coupe (240) ayant une partie de coupe disposée sur un côté gauche ou un côté droit de ceux-ci. Des maillons de coupe (240) ayant la partie de coupe sur le côté droit sont des maillons de coupe droits et des maillons de coupe (240) ayant la partie de coupe sur leur côté gauche sont des maillons de coupe gauches. La chaîne (300) comprend au moins un maillon de coupe droit pour lequel un maillon de coupe suivant est un autre maillon de coupe droit ou au moins un maillon de coupe gauche pour lequel le maillon de coupe suivant est un autre maillon de coupe gauche.
PCT/IB2016/051238 2015-03-04 2016-03-04 Chaîne de tronçonneuse différentielle WO2016139637A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US201562128134P 2015-03-04 2015-03-04
US62/128,134 2015-03-04

Publications (1)

Publication Number Publication Date
WO2016139637A1 true WO2016139637A1 (fr) 2016-09-09

Family

ID=55527601

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2016/051238 WO2016139637A1 (fr) 2015-03-04 2016-03-04 Chaîne de tronçonneuse différentielle

Country Status (1)

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WO (1) WO2016139637A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040789A (en) * 1956-11-05 1962-06-26 Remington Arms Co Inc Saw chain
US3066711A (en) * 1958-04-09 1962-12-04 Sandvikens Jernverks Ab Saw chain
US3608595A (en) * 1968-07-10 1971-09-28 John W Oehrli Saw chain
US20080072733A1 (en) * 2004-12-01 2008-03-27 Matthias Schulz Saw Chain for A Power Chain Saw

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3040789A (en) * 1956-11-05 1962-06-26 Remington Arms Co Inc Saw chain
US3066711A (en) * 1958-04-09 1962-12-04 Sandvikens Jernverks Ab Saw chain
US3608595A (en) * 1968-07-10 1971-09-28 John W Oehrli Saw chain
US20080072733A1 (en) * 2004-12-01 2008-03-27 Matthias Schulz Saw Chain for A Power Chain Saw

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