EP0387562B1 - Schiene für Motorkettensägen - Google Patents

Schiene für Motorkettensägen Download PDF

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Publication number
EP0387562B1
EP0387562B1 EP90103438A EP90103438A EP0387562B1 EP 0387562 B1 EP0387562 B1 EP 0387562B1 EP 90103438 A EP90103438 A EP 90103438A EP 90103438 A EP90103438 A EP 90103438A EP 0387562 B1 EP0387562 B1 EP 0387562B1
Authority
EP
European Patent Office
Prior art keywords
section
guide bar
run
central axis
vertex
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.)
Expired - Lifetime
Application number
EP90103438A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0387562A1 (de
Inventor
Heinrich Kesper
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
Priority claimed from DE19893907812 external-priority patent/DE3907812A1/de
Application filed by Individual filed Critical Individual
Publication of EP0387562A1 publication Critical patent/EP0387562A1/de
Application granted granted Critical
Publication of EP0387562B1 publication Critical patent/EP0387562B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • B27B17/02—Chain saws equipped with guide bar
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/909—Cutter assemblage or cutter element therefor [e.g., chain saw chain]
    • Y10T83/917—Having diverse cutting elements
    • Y10T83/921—And noncutting depth gauge

Definitions

  • the invention relates to a rail for chainsaws of the type defined in the preamble of claim 1.
  • asymmetrical rails In contrast, rails of the type described at the outset (US Pat. No. 3,323,561, DE-AS 15 03 968), which are generally referred to as asymmetrical rails, are known to be more suitable for piercing work. In particular, they succeed in avoiding the known shaking of the saws, which, when using symmetrical rails, can even result in the saw being pushed out of the incision to be made. With asymmetrical rails, however, there is still no way to avoid kickback. A mere transfer of the known shaping of the rail, which is intended to avoid setbacks, would reduce the advantages of the asymmetrical rail that can be achieved when plunging in completely nullify essential.
  • the invention is therefore based on the object of designing the rail of the type described in the introduction in such a way that, as with symmetrical rails, kickback is also eliminated with it.
  • this is intended to make a rail available for chainsaws, which makes it possible to carry out grooving work with little effort and high cutting performance.
  • the invention has the surprising advantage that the motor chain saw equipped with the proposed rail not only works completely without kickback, but also enables easy, targeted plunge cutting and also leads to high cutting performance with plunging work with little effort.
  • the inlet section extends over an arc angle of at most 80 ° and an arc radius is provided that corresponds to at most half the chain width, then there is surprisingly the additional advantage that the rail leads to a rebound-free motor chain saw, the cutting performance of which is optimally designed in the range of Outlet section even provides a higher cutting performance than in the area of the actual cutting section.
  • a conventional motor chain saw contains a housing 1, in which the drive consisting of an electric motor or an internal combustion engine and a rail receptacle for a conventional rail 2 are accommodated. Furthermore, a rear handle 3, a front handle 4 and a hand guard 5 are provided.
  • the rail 2 is provided in its circumferential surface with a guide groove, not shown, which serves to guide a saw chain 6 in that the drive links with sliding fit lie in the guide groove and the chain links are supported on the circumferential surface of the rail 2.
  • the rail 2 has at its one rear end connecting elements 7 and 8 (FIG. 2) in the form of slots and bores or the like, which interact with corresponding connecting elements of the rail receptacle in the form of locating bolts and chain tensioners or the like.
  • the saw chain 6 runs via a chain wheel driven by the drive, which rotates the saw chain 6 in the direction of the arrows shown in FIG. 1.
  • the rail 2 has a tip section 9, along which the leading run of the saw chain 6 is deflected to the returning run.
  • This process can be supported in a known manner by a deflecting star rotatably mounted in the front end of the rail 2.
  • the rail 2 has a central axis 11, on one side of which a forward section 12 extending from the rear end in the direction of the front end and on the other side of which a return section or cutting section 13 of the peripheral surface extending in the direction of the rear end is arranged.
  • the leading section 12 merges at its front end E into an inlet section 14 lying on the same side of the central axis 11 as to gradually foremost point of the rail, the apex 15, to end.
  • a likewise arcuate outlet section 16 leads gradually to the beginning A, which is also at the front, of the cutting section 13 lying on the same side of the central axis 11 as this. All these sections are part of the peripheral surface of the rail 2 which guides the saw chain 6, the apex 15 being the foremost point represents.
  • the area which is particularly critical for kicking back conventional motor chain saws is indicated in FIG. 2 by reference number 17. It essentially comprises the entire inlet section 14, the apex 15 and a short section of the outlet section 16 adjacent to this. If the saw chain is held in this area against a solid, hard object, the motor chain saw is hardly able to abruptly kick back even with great effort prevent. This is true even for those motor chain saws which have a comparatively small radius in the area of the tip 9, although the tendency to kickback is lower for these. Apart from that, the tendency to kickback is e.g. depending on what part and at what angle the tip 9 is brought up to the object, how high the rotational speed of the saw chain or how the chainsaw is being held by the user.
  • the inlet bend 14 a radius of curvature of only 10 to 30 mm in the area of the apex 15 and to form it between this area and the return section 12 as a bevel which has a radius of at least 150 mm and includes an angle of 10 ° to 40 ° with the axis 11.
  • the rail 2 is mirror-symmetrical to its central axis 11 so that it can be used in a known manner on both sides and, if necessary, can be mounted upside down in the rail holder.
  • the front part of a rail 21 according to the invention is shown in FIG. 3.
  • the rail 21 includes a forward section 22 and a return or cutting section 23, both of which are substantially parallel to one another a central axis 24 or are slightly convex curved.
  • the front end E1 of the leading section 22 merges into an inlet section 25, which ends at the apex S1.
  • the inlet section 25 has a part running up to a point 27 with a constant radius of approx.37.5 mm corresponding to half the rail width and from there a short, somewhat more curved, that is to say a smaller radius of curvature, transition section 29 which extends to the apex S1 leads.
  • An outlet section 30 leads from this to the start A1 of the cutting section 23, the outlet section 30 essentially having a radius of curvature of more than 100 mm and at its ends being provided with two short transition sections 31 and 32, which have a smaller radius of curvature and which are provided with the apex S1 or the beginning A1 of the cutting section 23 are connected.
  • a line 33 connects the apex S1 to the base point M1 of the solder 35 from the end E1 of the lead section 22 to the central axis 24.
  • This base point M1 is at the same time the center of a cylinder surface forming the first part of the lead-in section 25 with the radius corresponding to the distance M1E1.
  • Line 33 forms an angle a1 of 26 ° with central axis 24.
  • the angle b1 between the central axis 24 and a tangent 36 to a point 37, which lies approximately in the middle of the outlet section 30, is approximately 40 ° to 70 °.
  • the angle b1 is approx. 55 °, which leads to excellent cutting performance.
  • Fig. 4 shows schematically rails which correspond to the rails of Fig. 3, so that the same reference numerals are used for the same parts.
  • the arc of the inlet section 25 with the radius M1E1 is here schematically extended beyond the central axis 24 to a point 40, so that the inlet section 25 extends over an arc length of exactly 90 ° and ends in the vertex S2 lying on the central axis 24.
  • This is then followed by the transition section 31a, which has the same radius M1E1 and extends from S2 to point 40, of an outlet section provided with the reference number 30a and ending at the beginning A2 of the elongated cutting section 23.
  • the motor chain saw would have a strong tendency to kickback.
  • the outlet section is formed according to a further dashed line 30b would be and would directly meet the apex S2 at an angle of approximately 40 ° to 70 °, ie without using the transition section 31a opening tangentially into the apex S2.
  • the apex for example S3
  • the cutting section 23 for example along an outlet section 30c shown in solid lines
  • 4 is arranged at least about 2 mm above the central axis 24, the tendency to kickback is practically eliminated. These 2 mm correspond approximately to an angle a1 of 10 ° for rails with the smallest width occurring in practice.
  • FIG. 4 makes it clear that the inlet section 25, if it is pulled through from the end E1 with a constant radius M1E1, is broken off before reaching the central axis 24 and must be transferred into the outlet section 30 or 30c in such a way that the apex resulting therefrom S1 or S3 lies above the central axis 24.
  • the parts of the transition or outlet sections lying below the apex S1 or S3 in FIG. 4 should, if possible, be behind the apex (to the left in FIG. 4) or at most over a very short distance at the same height as the apex (in FIG 3 vertically below this). Under no circumstances may these sections lie in front of the apex (to the right in FIG. 4).
  • short transition cuts 29 and 31 are provided in the immediate vicinity of the apex S1, which have the smallest possible radius, which is just sufficient for an unimpeded chain run, of at most approximately 15 mm, so that the apex S1 has a circumferential surface forms lying line, which runs perpendicular to the mostly plane-parallel side surfaces of the rail 21 and from which the transition sections 29, 31 quickly move backwards.
  • FIG. 4 shows that the apex (for example S1, S3) - viewed in plan view of a side face of the rail - lies in an imaginary area sector which, through the central axis 24 (distance M1S2), is an arc around M1 with the radius M1E1 and the solder 35 of E1 is limited to the central axis 24, where M1 is the intersection of the solder 35 with the central axis 24.
  • the crest can not be on the M1S2 route lie because it must lie above the same, and also not be arranged on the solder 35.
  • the vertex selected in the individual case is preferably placed at a location which ensures an undisturbed, low-friction chain run that is as impact-free as possible.
  • the inlet section 25 in accordance with FIG. 3 in the manner of a spiral which emerges tangentially from the end E1 of the return section 22 and then receives an increasingly smaller radius of curvature.
  • the apex S3 according to FIG. 4 as the intersection of the arcuate, convex inlet section 25 and the, for example, straight outlet section 30c, provided that the corner formed thereby in the apex S3 is not too acute.
  • the vertex S1, S3 or S4 lies according to the invention and in accordance with FIG. 4 in each case in the first quadrant of an imaginary circle formed around M1 with the radius M1E1, whereby it also lies on the circular line itself, but not on the axes (Lot 35, route M1S2) of an imaginary coordinate system erected in M1.
  • the end E, the apex S and the start A are actually narrow lines lying in the peripheral surface.
  • the solders E on the central axes are therefore imaginary lines which run through the centers of the lines E, so that the circles formed with the radii ME are intended in the central plane of the rail.
  • the indication that the vertices lie in the said sector of the circle therefore means that the vertices penetrate this sector of the circle essentially perpendicularly.
  • the peripheral surface actually consists of two parallel, essentially identical guide surfaces, between which the guide groove for the drive links of the saw chain is arranged.
  • a leading section 44, a central axis 45, a cutting section 46, an inlet section 47 are one Vertex S5 and an outlet section 49 similar to FIG. 3 are provided.
  • the radius M5E5 of the inlet section 47 is 25 mm up to a point 50 and is then more curved up to the apex S5.
  • the angle a5 is 34 °, corresponding to an angle of 56 ° between the plumb line 51 and a line 52 through the apex S5 and the base point M5 of the plumb line 51.
  • the angle b5 of the aforementioned tangent to the outlet section is 58 °.
  • inlet section 56 an apex S6, an outlet section 58 with a tangent and the solder 59 from E6 to a central axis 60 the radius M6E6 is approx. 30 mm, the angle a6 approx. 45 ° and the angle b6 approx. 64 °.
  • the inlet section 56 is only formed over a very short section up to a point 57 with the radius M6E6 and is then connected to the apex S6 by a transitionally curved transition section, so that it lies far above the central axis 60.
  • the embodiment according to FIG. 7 essentially corresponds to the embodiment according to FIG. 3 with the difference that the angle a7 is approximately 36 ° and the angle b7 is approximately 63 °.
  • the rail width is 75 mm instead of 60 mm.
  • the angle a8 is approximately 15 °
  • the angle b8 is approximately 49 °
  • the radius M8E8 of an inlet section 61 is approximately 20 mm.
  • the inlet section 61 and an outlet section 63 intersect in a vertex S8 without a rounding having been made in this area with the transition areas 29 or 31 according to FIG. 3.
  • the inlet section 61 is curved more than when using one half the rail width corresponding radius of curvature would be the case.
  • the base point M8 of the solder 64 from the end E8 of a lead section 65 does not lie on a central axis 66 of the rail, but on a parallel line 67, which is arranged between the central axis 66 and the lead section 65.
  • the inlet section 61 from E8 to the apex S8 is continuously curved with the radius M8E8. If the inlet section 61 were continuous up to the parallel 67, ie extended over an arc of 90 °, the rail would tend to kick back, as explained with reference to FIG.
  • the parallel 67 could theoretically also lie between the central axis 66 and a return section 68.
  • the outlet section 63 becomes very short, taking into account the values given for the angle b8, so that the rail is less suitable for piercing work.
  • the center point 69 of the radius (line 70) for the outlet section 63 lies above the parallel 67 so that the outlet section 63 is somewhat oblique. i.e. emerges from the apex 58 at an angle deviating from 90 °, which is particularly advantageous in terms of avoiding setbacks.
  • the rail according to FIG. 8 excellent cutting performance is achieved, in particular when piercing the wood. No tendency to setback was found.
  • the invention is not based on the exemplary embodiments described limited, which can be modified in many ways.
  • the apex should be higher, the larger the radius of curvature of the inlet section or the wider the rail. For a given rail width, this results in a length of the outlet section which is favorable for the piercing process, within the specified angular range.
  • the outlet section should at least partially have a radius of more than 80 mm and the tangent to the center of this part should form an angle of 40 ° to 70 ° with the central axis. It is often expedient to arrange the center of the associated arc between the leading section and a parallel to the central axis through the apex or even completely outside the rail contour.
  • the dimensions given are variable within wide limits and, based on the teaching of the invention, can be set in individual cases in accordance with needs.
  • small radii of curvature in the inlet section reduce the tendency to kickback and can therefore be used in combination with very small angles a1 to a8.
  • the tendency to kickback can only be avoided with great difficulty if a good cutting performance is also required when grooving. Therefore, the inlet section, which can also have shapes other than those shown, should at no point have a radius of curvature greater than 40 mm.
  • the dimensions given for the outlet section must be optimized in individual cases through tests. It goes without saying that the dimensions given apply only to rails with the width offered on the market. When using rails with a different width, the dimensions must be adjusted accordingly. Otherwise, the outlet section can also be completely or partially slightly concave and provided at the ends with short, convex transition sections that lead to the apex or the cutting section.
  • the leading and cutting sections can be straight, but also slightly concave or, in accordance with FIG. 2, slightly curved.
  • an insertion bevel (DE-GM 88 03 810) which encloses an angle of 10 ° to 40 ° with the central axis and has a radius of curvature of at least 150 mm.
  • only short such insertion bevels are preferably provided or the outer contours of the rail sections adjoining the described inlet and outlet sections are left in their known commercially available form and the inlet sections are attached directly to the usual forward sections, in order thereby to provide the desired space for the outlet section favoring the piercing to accomplish.
  • inlet section it is not necessary to position the inlet section exactly tangentially at the end of the lead section. Rather, as indicated in FIG. 7 by a dashed line 71, it can also open at an angle into the end E7 of the lead section and form a corner at this end E7.
  • the inlet and outlet sections shown in FIGS. 3 to 8 can be combined with one another in any manner.
  • the deflection of the saw chain in the region of the apices S1 to S8 can in each case be supported by the additional use of a deflection star known per se and mounted in the tip of the rail.
  • the invention has the advantage that, even when using inlet sections with at least partially relatively large radii of curvature, setbacks are reliably avoided and long outlet sections are nevertheless obtained, which is favorable for effective piercing work.
  • 3 to 8 have been drawn to scale Rails proved to be particularly advantageous.
  • the rails described can only be operated in such a way that the saw chain is transported in the direction of the arrows shown in FIGS. 1 and 3.
  • the connecting elements 7, 8 (FIG. 2) or the associated connecting members of the rail receptacle are expediently designed such that the rail only can be installed in the right way.
  • 3 to 8 is preferably convexly curved. However, this does not exclude curvatures other than those shown. In particular in the area adjacent to the end of the lead section, concave or wavy lines along an arc are also possible, provided these do not impair the chain travel.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Machines For Laying And Maintaining Railways (AREA)
  • Toys (AREA)
  • Vending Machines For Individual Products (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Power Steering Mechanism (AREA)
  • Dry Shavers And Clippers (AREA)
  • Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
  • Shovels (AREA)
  • Harvester Elements (AREA)
  • Escalators And Moving Walkways (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Road Repair (AREA)
  • Machine Tool Units (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Tires In General (AREA)
  • Superconductive Dynamoelectric Machines (AREA)
  • Ceramic Products (AREA)
EP90103438A 1989-03-11 1990-02-22 Schiene für Motorkettensägen Expired - Lifetime EP0387562B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19893907812 DE3907812A1 (de) 1988-03-21 1989-03-11 Schiene fuer motorkettensaegen
DE3907812 1989-03-11

Publications (2)

Publication Number Publication Date
EP0387562A1 EP0387562A1 (de) 1990-09-19
EP0387562B1 true EP0387562B1 (de) 1992-12-09

Family

ID=6376034

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90103438A Expired - Lifetime EP0387562B1 (de) 1989-03-11 1990-02-22 Schiene für Motorkettensägen

Country Status (15)

Country Link
US (1) US5035057A (cs)
EP (1) EP0387562B1 (cs)
JP (1) JP2860496B2 (cs)
AT (1) ATE83188T1 (cs)
CA (1) CA2011846C (cs)
CS (1) CS276525B6 (cs)
DD (1) DD299420A5 (cs)
DE (1) DE59000564D1 (cs)
DK (1) DK0387562T3 (cs)
ES (1) ES2038007T3 (cs)
FI (1) FI101771B1 (cs)
GR (1) GR3006623T3 (cs)
NO (1) NO174457C (cs)
RU (1) RU1836208C (cs)
UA (1) UA13129A (cs)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ATE138598T1 (de) * 1991-12-24 1996-06-15 Euroligna Masch Aggregate Führungsschiene für eine motorsäge
CN106017484B (zh) * 2016-05-16 2018-12-14 南京恒星自动化设备有限公司 轨道路径数据采集及拟合方法

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3323561A (en) * 1964-11-23 1967-06-06 Elmo W Lahtinen Chain saw cutter bar
US3905104A (en) * 1974-06-19 1975-09-16 Alva Z Albright Replaceable liners for saw bar grooves
US4060895A (en) * 1976-11-15 1977-12-06 Omark Industries, Inc. Non-symmetrical bar with reversible body portion
CA1045519A (en) * 1976-12-10 1979-01-02 Robin A. Plumbley Guide bar with saw chain oiling feature
US4257162A (en) * 1979-04-27 1981-03-24 Pardon John T Chain saw guard
NL8102814A (nl) * 1981-06-11 1983-01-03 Skil Nederland Nv Zaaginrichting.
US4722141A (en) * 1985-04-23 1988-02-02 Windsor Machine Co., Limited Chain saw cutter bar-nose assembly
US4887357A (en) * 1986-11-24 1989-12-19 Pro Power Corporation Articulated endless-band saw blade and support therefor
US4796502A (en) * 1987-08-26 1989-01-10 Pro Power Corporation Saw blade structure with depth-control means
DE8803810U1 (de) * 1988-03-21 1988-05-05 Kesper, Heinrich, 3501 Naumburg Schiene für Motorkettensägen

Also Published As

Publication number Publication date
CA2011846C (en) 1999-07-20
CS113990A3 (en) 1992-06-17
JP2860496B2 (ja) 1999-02-24
FI101771B (fi) 1998-08-31
DE59000564D1 (de) 1993-01-21
NO174457B (no) 1994-01-31
DD299420A5 (de) 1992-04-16
EP0387562A1 (de) 1990-09-19
NO901126L (no) 1990-09-12
US5035057A (en) 1991-07-30
FI101771B1 (fi) 1998-08-31
CA2011846A1 (en) 1990-09-11
NO901126D0 (no) 1990-03-09
ATE83188T1 (de) 1992-12-15
ES2038007T3 (es) 1993-07-01
JPH02273201A (ja) 1990-11-07
NO174457C (no) 1994-05-11
GR3006623T3 (cs) 1993-06-30
UA13129A (uk) 1997-02-28
CS276525B6 (en) 1992-06-17
DK0387562T3 (da) 1993-03-29
RU1836208C (ru) 1993-08-23
FI901206A0 (fi) 1990-03-09

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