EP0070361B1 - Portable power-driven saw - Google Patents

Portable power-driven saw Download PDF

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Publication number
EP0070361B1
EP0070361B1 EP82103869A EP82103869A EP0070361B1 EP 0070361 B1 EP0070361 B1 EP 0070361B1 EP 82103869 A EP82103869 A EP 82103869A EP 82103869 A EP82103869 A EP 82103869A EP 0070361 B1 EP0070361 B1 EP 0070361B1
Authority
EP
European Patent Office
Prior art keywords
saw
stop
holding
guiding device
cutting members
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
Application number
EP82103869A
Other languages
German (de)
French (fr)
Other versions
EP0070361A2 (en
EP0070361A3 (en
Inventor
Johannes Möhlenkamp
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.)
MOEHLENKAMP, MARKUS
MOEHLENKAMP, MICHAEL
Original Assignee
Mohlenkamp Markus
Mohlenkamp Michael
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 Mohlenkamp Markus, Mohlenkamp Michael filed Critical Mohlenkamp Markus
Priority to AT82103869T priority Critical patent/ATE18646T1/en
Publication of EP0070361A2 publication Critical patent/EP0070361A2/en
Publication of EP0070361A3 publication Critical patent/EP0070361A3/en
Application granted granted Critical
Publication of EP0070361B1 publication Critical patent/EP0070361B1/en
Expired 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
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/003—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for chain saws
    • 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
    • B27B17/0083—Attachments for guiding or supporting chain saws during operation
    • 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

Definitions

  • the invention relates to a hand-operated chain saw according to the preamble of patent claim 1.
  • Such hand-operated chainsaws in the form of circular, chain or band saws are preferably used as mobile brush cutters in forestry and agriculture and are used in particular for delimbing felled tree trunks and standing trees. Delimbing with such saws is very time-consuming and energy-intensive and requires a lot of skill. The risk of accidents is very high. The stop provided on the holding and guiding device of the saw for receiving the branch is intended to remedy this.
  • the stop is formed as the edge of a recess in a protective device which is firmly connected to the holding and guiding device of the saw by means of screws.
  • the two edges of the recess protrude only with their free end regions of the cutting members of the saw, and to carry out a delimbing operation, only the front edge in the circumferential direction of the cutting members is brought to rest on a protruding branch in order to guide the saw in the longitudinal direction, while the opposite the leading edge of the flattened trailing edge of the recess should ensure better sliding of the sawn off branches as well as the holding and guiding device over the remaining branches.
  • the opening width of the recess in the known chain saw depends on the branch thickness of the trees to be branched. However, since very different branch thicknesses occur in nature, the use of the known stop is limited and associated with dangers. If the recess is presented with thin branches, the diameter of which is smaller than the opening width of the recess, the sawing forces of the cutting members with the branch can cause the resulting forces that the saw jumps off the branch as a result of the play between the edges of the recess, while one of Thicker branch approached to the saw, the diameter of which exceeds the opening width of the recess, is clamped between the edges, which can result in damage to the stop and / or the cutting members of the saw.
  • the invention has for its object to provide a hand-operated chainsaw of the type mentioned, the stop is designed so that with substantially unrestricted use of the stop delimbing places less demands on the skill of the operating personnel and is significantly easier with correspondingly reduced accident risks.
  • a non-slip position of the cutting members with respect to the branch or corresponding material to be cut is ensured in that the branch is picked up and held securely by the receiving mouth formed by the gripping legs of the spring-loaded stop in the feed direction of the saw before the start of a sawing process. Because the receiving mouth of the stop is in front of the orbit of the cutting members, the opening width between the two gripping legs is not critical, and a large variety of different branch diameters can be received without damage to the stop and the 'cutting members, so that the stop in its application is practically unlimited. Purch pressing the saw with its cutting members against the branch held in the stop, the stop moves back against the feed direction of the saw while overcoming the spring force.
  • an embodiment as a chain saw according to claim 7 is particularly preferred for forestry operation.
  • FIG. 1 In the drawing is an example of a manual chain saw with a stop and guiding device guided, by means of an internal combustion engine or electric motor, rotating cutting links a chainsaw with an elongated, flat support sword 1 made of steel as a holding and guiding device for the cutting links.
  • the cutting links are formed in a manner known per se from saw teeth firmly connected to the chain links of a saw chain indicated by two-dot chain lines.
  • the saw chain 2 is guided on the circumference of the support sword 1 in a circumferential guide and transport groove (not shown), the support sword 1 having two end-side deflection areas, of which only one front deflection end 3 is shown in the drawing.
  • the carrying sword 1 is firmly connected on its upper side 4 to a motor housing containing a drive motor together with a handle device, as is also the case in this end region with the drive from the drive motor in a manner known per se via a drive sprocket to the rest in the circumferential guide groove rotating saw chain is transferred.
  • the carrying sword 1 For sawing off cut material, in particular branches of felled, lying tree trunks, the carrying sword 1 is provided at its deflecting end 3 with a spring-loaded stop 5 for receiving the branch.
  • the stop 5 is normally upstream in the position of the orbit of the saw chain 2 shown in the drawing, in the feed direction indicated by the arrow 6 in the extension of the longitudinal central axis of the carrying sword 1, in which the saw is advanced to saw off a branch.
  • the stop 5 has two angularly projecting gripping legs 7 and 8, which merge into one another at their inner ends and, with their mutually facing inner sides 9 and 10, a receiving mouth for branches and the like. Like. form material to be cut.
  • the stop 5 is supported for a relative movement against the feed direction 6 of the saw movably on the support sword 1 and for this purpose comprises a support area 12 resting on the upper side 4 of the support sword 1, through which the gripping legs 7 and 8 are held at a short distance above the saw chain 2.
  • a middle guide member 13 adjoins downward, which engages in a guide track 14 incorporated in the vertical longitudinal center plane of the support sword 1, which in the example shown has the shape of a longitudinal slot, the depth of which corresponds to the thickness of the support sword 1.
  • the stop 5 is provided with a support shoe 15 which grips under the carrying sword 1 and which is located below the guide member 13 and can be moved together with the stop 5.
  • the support shoe 15 is firmly connected to the stop unit comprising the support area 12 and the guide member 13 by a screw connection indicated at 16. While the support area 12 is slidably supported with its underside on the upper side 4 of the support sword 1, the support shoe 15 is displaceable with its upper side on both sides of the guide member 13 along the underside 17 of the support sword 1.
  • a spring contact member 18 which is formed by an elongated rod 19 in the example shown.
  • the rod 19 is firmly connected at one end to the guide member 13 of the stop unit 5, extends through the guide track 14 of the carrying sword 1 and is provided at its other, free end with an abutment plate 20 which extends vertically upward from the guide track 14.
  • the plate 20 rests on a compression spring 21 which acts on the stop 5 in the feed direction 6 of the saw, e.g. a coil spring, the other end of which is supported on a rear wall 22 of a spring housing 23 which is open at the front.
  • the spring housing 23 has a central main part 24 which supports the compression spring 21 and which is adapted to its contour and which is fastened on the upper side 4 of the support sword 1 with the aid of lateral housing flanges 25.
  • the guide housing 23 or its main part 24 can also be provided with mutually opposite lateral guide tracks 26 for guiding the spring contact plate 20, which for this purpose can be provided with lateral guide members (not shown) which engage in the guide tracks 26.
  • the support sword 1 is placed on the top of a trunk with the support shoe 15 of the stop 5.
  • the underside 27 of the support shoe 15 is concavely curved to match the convex curvature of the tree trunk, as can be seen from FIG. 3.
  • the support sword 1 is pushed in the feed direction 6, ie from behind, onto the branch with a sliding forward movement of the support shoe 15 until the branch is received and held in the receiving mouth of the stop 5.
  • the pressure exerted by the compression spring 21 on the stop 5 is overcome and this undergoes a relative movement against the feed direction 6, ie to the rear, so that the initially held at a short distance in front of the orbit of the saw chain 2 Branch in the orbital plane the saw chain 2 arrives and is sawn off progressively by steadily pressing the carrying sword 1 with a corresponding further backward movement of the stop 5 and compressing the compression spring 21 when the engine is switched on.
  • the stop 5 is automatically pushed back into its starting position shown in the drawing by the compression spring 21.
  • branches that can only be sawed off with great difficulty in the top area of a lying trunk can be removed with particular ease because in these cases the support sword 1 with the support shoe 15 simply slides in the upper arch area of the trunk Support can be performed with little effort. Thanks to the secure hold that the branches to be sawn off in the stop 5 during the sawing process, however, branches that have a different position on the lying log are comparatively easy to saw off.
  • the ease of use is further favored by the fact that it is possible to work in the manner described parallel to the longitudinal direction of the trunk and that the saw or the carrying sword 1 only ever has to be rotated about the longitudinal axis when transitioning to another branch to be cut off.

Abstract

1. A manually operated power saw having circulating cutting members which are guided by a holding and guiding device (1) and driven by means of a motor, and having a stop (5) provided on the holding and guiding device (1), characterised in that the stop (5) has two gripping arms (7, 8) which spread apart at an angle and which, with their adjacent inner sides (9, 10), form a receiving jaw for branches and the like material to be cut, the receiving jaw being mounted in front of the circulation path of the cutting members in the feed direction (6) of the saw, and in that the stop (5) is acted upon by spring force in the feed direction (6) and is movably supported on the holding and guiding device (1) for relative movement counter to the feed direction (6), overcoming the spring force.

Description

Die Erfindung betrifft eine handbetätigte Motorsäge nach dem Oberbegriff des Patentanspruchs 1.The invention relates to a hand-operated chain saw according to the preamble of patent claim 1.

Derartige handbetätigte Motorsägen in Form von Kreis-, Kettenoder Bandsägen finden vorzugsweise als mobile Freischneidgeräte in der Forst- und in der Landwirtschaft Anwendung und dienen insbesondere zum Entasten gefällter Baumstämme wie auch stehender Bäume. Die Entastungsarbeit mit solchen Sägen ist sehr zeitund kraftaufwendig und erfordert viel Geschick. Dabei ist die Unfallgefahr sehr groß. Hier soll der an der Halte- und Führungsvorrichtung der Säge vorgesehene Anschlag zur Aufnahme des Astes Abhilfe schaffen.Such hand-operated chainsaws in the form of circular, chain or band saws are preferably used as mobile brush cutters in forestry and agriculture and are used in particular for delimbing felled tree trunks and standing trees. Delimbing with such saws is very time-consuming and energy-intensive and requires a lot of skill. The risk of accidents is very high. The stop provided on the holding and guiding device of the saw for receiving the branch is intended to remedy this.

Bei einer bekannten handbetätigten Motorsäge der angegebenen Art (DE-A-2 164 372) ist der Anschlag als Kante einer Ausnehmung einer Schutzvorrichtung gebildet, die mit der Halteund Führungsvorrichtung der Säge mittels Schrauben fest verbunden ist. Die beiden Kanten der Ausnehmung überragen dabei nur mit ihren freien Endbereichen die Schneidglieder der Säge, und zur Durchführung eines Entastungsvorgangs wird lediglich die in Umlaufrichtung der Schneidglieder vordere Kante auf einem abstehenden Ast zur Anlage gebracht, um die Säge in Längsrichtung zu führen, während die gegenüber der vorauslaufenden Kante stark abgeflachte nachlaufende Kante der Ausnehmung ein besseres Abgleiten der abgesägten Äste sowie der Halte- und Führungsvorrichtung über die verbleibenden Aststummel gewährleisten soll. Die Öffnungsbreite der Ausnehmung richtet sich bei der bekannten Motorsäge nach der Aststärke der zu astenden Bäume. Da jedoch in der Natur sehr unterschiedliche Aststärken vorkommen, ist die Verwendung des bekannten Anschlags begrenzt und mit Gefahren verbunden. Werden der Ausnehmung dünne Äste dargeboten, deren Durchmesser kleiner als die Öffnungsbreite der Ausnehmung ist, so können beim Sägeeingriff der Schneidglieder mit dem Ast die dabei entstehenden Kräfte bewirken, daß infolge des Spiels zwischen den Kanten der Ausnehmung die Säge vom Ast abspringt, während ein von der Säge angegangener dickerer Ast, dessen Durchmesser die Öffnungsbreite der Ausnehmung übersteigt, zwischen den Kanten eingeklemmt wird, was Zerstörungen am Anschlag und/oder den Schneidgliedern der Säge zur Folge haben kann.In a known hand-operated chainsaw of the type specified (DE-A-2 164 372), the stop is formed as the edge of a recess in a protective device which is firmly connected to the holding and guiding device of the saw by means of screws. The two edges of the recess protrude only with their free end regions of the cutting members of the saw, and to carry out a delimbing operation, only the front edge in the circumferential direction of the cutting members is brought to rest on a protruding branch in order to guide the saw in the longitudinal direction, while the opposite the leading edge of the flattened trailing edge of the recess should ensure better sliding of the sawn off branches as well as the holding and guiding device over the remaining branches. The opening width of the recess in the known chain saw depends on the branch thickness of the trees to be branched. However, since very different branch thicknesses occur in nature, the use of the known stop is limited and associated with dangers. If the recess is presented with thin branches, the diameter of which is smaller than the opening width of the recess, the sawing forces of the cutting members with the branch can cause the resulting forces that the saw jumps off the branch as a result of the play between the edges of the recess, while one of Thicker branch approached to the saw, the diameter of which exceeds the opening width of the recess, is clamped between the edges, which can result in damage to the stop and / or the cutting members of the saw.

Der Erfindung liegt die Aufgabe zugrunde, eine handbetätigte Motorsäge der eingangs angegebenen Art zu schaffen, deren Anschlag so gestaltet ist, daß bei im wesentlichen uneingeschränkter Verwendbarkeit des Anschlags das Entasten geringere Anforderungen an die Geschicklichkeit des Bedienungspersonals stellt und bei entsprechend herabgesetzten Unfallgefahren wesentlich erleichtert ist.The invention has for its object to provide a hand-operated chainsaw of the type mentioned, the stop is designed so that with substantially unrestricted use of the stop delimbing places less demands on the skill of the operating personnel and is significantly easier with correspondingly reduced accident risks.

Diese Aufgabe wird nach der Erfindung durch eine Ausgestaltung der Motorsäge gemäß dem Patentanspruch 1 gelöst.This object is achieved according to the invention by an embodiment of the chain saw according to claim 1.

Bei dieser Ausgestaltung ist eine abrutschsichere Position der Schneidglieder in bezug auf den Ast oder entsprechendes Schneidgut dadurch gewährleistet, daß der Ast vor Beginn eines Sägevorgangs von dem von den Greifschenkeln gebildeten Aufnahmemaul des in Vorschubrichtung der Säge vorgelagerten, federbeaufschlagten Anschlagsaufgenommen und sicher gehalten wird. Dadurch, daß das Aufnahmemaul des Anschlags der Umlaufbahn der Schneidglieder vorgelagert ist, ist die Öffnungsbreite zwischen den beiden Greifschenkeln unkritisch, und es kann eine große Vielfalt unterschiedlicher Astdurchmesser ohne Schaden für den Anschlag und die ' Schneidglieder aufgenommen werden, so daß der Anschlag in seiner Anwendung praktisch keinen Beschränkungen unterliegt. Purch Anpressen der Säge mit ihren Schneidgliedern an den im Anschlag gehaltenen Ast erfolgt ein Zurückweichen des Anschlags entgegen der Vorschubrichtung der Säge unter Überwindung der Federkraft. Hierdurch wird der Schneideingriff der Schneidglieder der Säge mit dem Ast hergestellt, der daraufhin bei eingeschaltetem Motor in einem sauberen Schnitt unter fortschreitendem Zurückweichen des Anschlags entgegen der Federkraft abgesägt werden kann. Auf diese Weise lassen sich Entastungs-u. dgl. Arbeiten zügig, mit einem hohen Maß an Genauigkeit und unter weitgehender Vermeidung von Unfallgefahren durchführen.In this embodiment, a non-slip position of the cutting members with respect to the branch or corresponding material to be cut is ensured in that the branch is picked up and held securely by the receiving mouth formed by the gripping legs of the spring-loaded stop in the feed direction of the saw before the start of a sawing process. Because the receiving mouth of the stop is in front of the orbit of the cutting members, the opening width between the two gripping legs is not critical, and a large variety of different branch diameters can be received without damage to the stop and the 'cutting members, so that the stop in its application is practically unlimited. Purch pressing the saw with its cutting members against the branch held in the stop, the stop moves back against the feed direction of the saw while overcoming the spring force. As a result, the cutting engagement of the cutting elements of the saw with the branch is produced, which can then be sawn off with the motor switched on in a clean cut while the stop progressively withdrawing against the spring force. In this way, delimbing u. Carry out work quickly, with a high degree of accuracy and largely avoiding the risk of accidents.

Weitere Ausgestaltungen der Erfindung, die in zweckmäßiger und vorteilhafter Weise der sicheren und genauen Handhabung der erfindungsgemäßen Motorsäge förderlich sind, sind in den Ansprüchen 2 bis 6 angegeben.Further refinements of the invention which are expedient and conducive to the safe and precise handling of the chain saw according to the invention are specified in claims 2 to 6.

Obwohl die erfindungsgemäße Ausgestaltung bei allen freischneidenden, handbetätigten Motorsägen der angegebenen Art mit Vorteil Anwendung finden kann, ist eine Ausgestaltung als Kettensäge gemäß dem Anspruch 7 für den forstwirtschaftlichen Betrieb besonders bevorzugt. Bei dieser Ausgestaltung ist zudem eine sehr günstige Arbeitshöhe gegeben, die die Veichte, einfache Handhabung der Säge im Betrieb weiter begünstigt.Although the configuration according to the invention can be used with advantage in all free-cutting, hand-operated chainsaws of the type specified, an embodiment as a chain saw according to claim 7 is particularly preferred for forestry operation. In this embodiment, there is also a very favorable working height, which further favors the easy, easy handling of the saw in operation.

Ein Ausführungsbeispiel des Gegenstands der Erfindung ist im folgenden anhand der Zeichnung näher erläutert. In der Zeichnung zeigen:

  • Fig. 1 eine Draufsicht auf eine handbetätigte Motorsäge in Form einer Kettensäge unter Fortlassung des Motorgehäuses mit dem Antriebsmotor und der Handgriffeinrichtung zum Halten der Säge,
  • Fig. 2 einen Längsschnitt durch die Säge nach der Linie 11-11 der Fig. 1, und
  • Fig. 3 eine Stirnansicht einer Einzelheit der Säge.
An embodiment of the object of the invention is explained below with reference to the drawing. The drawing shows:
  • 1 is a plan view of a hand-operated chainsaw in the form of a chainsaw, leaving out the motor housing with the drive motor and the handle device for holding the saw,
  • Fig. 2 is a longitudinal section through the saw along the line 11-11 of Fig. 1, and
  • Fig. 3 is an end view of a detail of the saw.

In der Zeichnung ist als Beispiel für eine handbetätigte Motorsäge mit von einer Halteund Führungsvorrichtung geführten, mittels eines Verbrennungskraft- oder Elektromotors antreibbaren, umlaufenden Schneidgliedern eine Kettensäge mit einem langgestreckten, flachen Tragschwert 1 aus Stahl als Halte- und Führungsvorrichtung für die Schneidglieder dargestellt. Die Schneidglieder sind bei einer solchen Kettensäge in an sich bekannter Weise von mit den Kettengliedern einer bei 2 strichpunktiert angedeuteten Sägekette fest verbundenen Sägezähnen gebildet. Die Sägekette 2 ist auf dem Umfang des Tragschwertes 1 in einer (nicht dargestellten) umlaufenden Führungs- und Transportnut geführt, wobei das Tragschwert 1 zwei endseitige Umlenkbereiche aufweist, von denen in der Zeichnung nur ein vorderes Umlenkende 3 zur Darstellung kommt. Im dem Umlenkende 3 gegenüberliegenden Endbereich ist das Tragschwert 1 auf seiner Oberseite 4 mit einem einen Antriebsmotor enthaltenden Motorgehäuse nebst Handgriffeinrichtung fest verbunden, wie auch in diesem Endbereich der Antrieb vom Antriebsmotor in an sich bekannter Weise über ein Antriebskettenrad auf die im übrigen in der umfangsseitigen Führungsnut umlaufende Sägekette übertragen wird.In the drawing is an example of a manual chain saw with a stop and guiding device guided, by means of an internal combustion engine or electric motor, rotating cutting links a chainsaw with an elongated, flat support sword 1 made of steel as a holding and guiding device for the cutting links. In such a chain saw, the cutting links are formed in a manner known per se from saw teeth firmly connected to the chain links of a saw chain indicated by two-dot chain lines. The saw chain 2 is guided on the circumference of the support sword 1 in a circumferential guide and transport groove (not shown), the support sword 1 having two end-side deflection areas, of which only one front deflection end 3 is shown in the drawing. In the end region opposite the deflecting end 3, the carrying sword 1 is firmly connected on its upper side 4 to a motor housing containing a drive motor together with a handle device, as is also the case in this end region with the drive from the drive motor in a manner known per se via a drive sprocket to the rest in the circumferential guide groove rotating saw chain is transferred.

Zum Absägen von Schneidgut, insbesondere von Ästen von gefällten, liegenden Baumstämmen, ist das Tragschwert 1 an seinem Umlenkende 3 mit einem federbeaufschlagten Anschlag 5 zur Aufnahme des Astes versehen. Der Anschlag 5 ist normalerweise in der in der Zeichnung wiedergegebenen Stellung der Umlaufbahn der Sägekette 2 vorgelagert, und zwar in der durch den Pfeil 6 kenntlich gemachten Vorschubrichtung in Verlängerung der Längsmittelachse des Tragschwertes 1, in der die Säge zum Absägen eines Astes vorbewegt wird.For sawing off cut material, in particular branches of felled, lying tree trunks, the carrying sword 1 is provided at its deflecting end 3 with a spring-loaded stop 5 for receiving the branch. The stop 5 is normally upstream in the position of the orbit of the saw chain 2 shown in the drawing, in the feed direction indicated by the arrow 6 in the extension of the longitudinal central axis of the carrying sword 1, in which the saw is advanced to saw off a branch.

Der Anschlag 5 besiizt zwei winklig voneinander abstehende Greifschenkel 7 und 8, die an ihren inneren Enden ineinander übergehen und mit ihren einander zugewandten Innenseiten 9 und 10 ein Aufnahmemaul für Äste u. dgl. Schneidgut bilden. Dabei ist die der durch einen Pfeil 11 kenntlich gemachten Umlaufrichtung der Sägekette 2 entgegengerichtete Innenseite 10 des Greifschenkels 8 gezackt, gezahnt oder in ähnlicher Weise uneben ausgebildet, wodurch der im Anschlag 5 aufgenommene Ast beim Sägen fest gegen die gezackte oder gezahnte Innenseitenausbildung gedrückt wird, mit der Folge, daß der Ast beim Sägevorgang fest im Aufnahmemaul des Anschlags 5 gehalten ist.The stop 5 has two angularly projecting gripping legs 7 and 8, which merge into one another at their inner ends and, with their mutually facing inner sides 9 and 10, a receiving mouth for branches and the like. Like. form material to be cut. In this case, the inside 10 of the gripping leg 8, which is indicated by the direction of rotation of the saw chain 2 and is indicated by an arrow 11, is serrated, serrated or similarly uneven, as a result of which the branch picked up in the stop 5 is pressed firmly against the serrated or serrated inside formation during sawing the consequence that the branch is firmly held in the receiving mouth of the stop 5 during the sawing process.

Der Anschlag 5 ist für eine Relativbewegung entgegen der Vorschubrichtung 6 der Säge beweglich am Tragschwert 1 abgestützt und umfaßt hierzu einen auf der Oberseite 4 des Tragschwertes 1 aufliegenden Auflagebereich 12, durch den die Greifschenkel 7 und 8 mit geringem Abstand oberhalb der Sägekette 2 gehalten sind. An den Auflagebereich 12 schließt sich ein mittleres Führungsglied 13 nach unten an, das in eine in der vertikalen Längsmittelebene des Tragschwertes 1 eingearbeitete Führungsbahn 14 eingreift, die bei dem dargestellten Beispiel die Form eines Längsschlitzes besitzt, dessen Tiefe der Dicke des Tragschwertes 1 entspricht. Ferner ist der Anschlag 5 mit einem das Tragschwert 1 untergreifenden Auflageschuh 15 versehen, der sich unterhalb des Führungsgliedes 13 befindet und gemeinsam mit dem Anschlag 5 bewegbar ist. Hierzu ist der Auflageschuh 15 mit der den Auflagebereich 12 und das Führungsglied 13 umfassenden Anschlageinheit durch eine bei 16 angedeutete Schraubverbindung fest verbunden. Während der Auflagebereich 12 mit seiner Unterseite auf der Oberseite 4 des Tragschwertes 1 gleitbar abgestützt ist, ist der Auflageschuh 15 mit seiner Oberseite beidseits des Führungsgliedes 13 entlang der Unterseite 17 des Tragschwertes 1 verschieblich.The stop 5 is supported for a relative movement against the feed direction 6 of the saw movably on the support sword 1 and for this purpose comprises a support area 12 resting on the upper side 4 of the support sword 1, through which the gripping legs 7 and 8 are held at a short distance above the saw chain 2. At the support area 12, a middle guide member 13 adjoins downward, which engages in a guide track 14 incorporated in the vertical longitudinal center plane of the support sword 1, which in the example shown has the shape of a longitudinal slot, the depth of which corresponds to the thickness of the support sword 1. Furthermore, the stop 5 is provided with a support shoe 15 which grips under the carrying sword 1 and which is located below the guide member 13 and can be moved together with the stop 5. For this purpose, the support shoe 15 is firmly connected to the stop unit comprising the support area 12 and the guide member 13 by a screw connection indicated at 16. While the support area 12 is slidably supported with its underside on the upper side 4 of the support sword 1, the support shoe 15 is displaceable with its upper side on both sides of the guide member 13 along the underside 17 of the support sword 1.

An seiner Rückseite ist der Anschlag 5 mit einem Federanlageglied 18 versehen, das bei dem dargestellten Beispiel von einem langgestreckten Stab 19 gebildet ist. Der Stab 19 ist an seinem einen Ende fest mit dem Führungsglied 13 der Anschlageinheit 5 verbunden, erstreckt sich dabei durch die Führungsbahn 14 des Tragschwertes 1 und ist an seinem anderen, freien Ende mit einer aus der Führungsbahn 14 senkrecht nach oben geführten Anlageplatte 20 versehen. Die Platte 20 liegt an einer den Anschlag 5 in Vorschubrichtung 6 der Säge beaufschlagenden Druckfeder 21, z.B. einer Schraubenfeder, an, deren anderes Ende an einer Rückwand 22 eines vorderseitig offenen Federgehäuses 23 abgestützt ist.On the back of the stop 5 is provided with a spring contact member 18, which is formed by an elongated rod 19 in the example shown. The rod 19 is firmly connected at one end to the guide member 13 of the stop unit 5, extends through the guide track 14 of the carrying sword 1 and is provided at its other, free end with an abutment plate 20 which extends vertically upward from the guide track 14. The plate 20 rests on a compression spring 21 which acts on the stop 5 in the feed direction 6 of the saw, e.g. a coil spring, the other end of which is supported on a rear wall 22 of a spring housing 23 which is open at the front.

Das Federgehäuse 23 besitzt einen die Druckfeder 21 abstützend umgebenden, ihrer Kontur angepaßten mittleren Hauptteil 24, der mit Hilfe seitlicher Gehäuseflansche 25 auf der Oberseite 4 des Tragschwertes 1 befestigt ist. Das Führungsgehäuse 23 bzw. dessen Hauptteil 24 kann außerdem mit einander gegenüberliegenden seitlichen Führungsbahnen 26 zur Führung der Federanlageplatte 20 versehen sein, die zu diesem Zweck mit seitlichen, in die Führungsbahnen 26 eingreifenden Führungsgliedern (nicht dargestellt) versehen sein kann.The spring housing 23 has a central main part 24 which supports the compression spring 21 and which is adapted to its contour and which is fastened on the upper side 4 of the support sword 1 with the aid of lateral housing flanges 25. The guide housing 23 or its main part 24 can also be provided with mutually opposite lateral guide tracks 26 for guiding the spring contact plate 20, which for this purpose can be provided with lateral guide members (not shown) which engage in the guide tracks 26.

Zum Absägen eines Astes wird das Tragschwert 1 auf die Oberseite eines Stammes mit dem Auflageschuh 15 des Anschlags 5 aufgelegt. Die Unterseite 27 des Auflageschuhs 15 ist dabei zurAnpassung an die konvexe Wölbung des Baumstammes konkav gewölbt, wie dies aus Fig. 3 ersichtlich ist. Dabei wird das Tragschwert 1 in Vorschubrichtung 6, d.h. von hinten, an den Ast unter gleitender Vorwärtsbewegung des Auflageschuhs 15 herangeschoben, bis der Ast im Aufnahmemaul des Anschlags 5 aufgenommen und gehalten ist. Durch weiteres Vorwärtsdrücken des Tragschwertes 1 in Vorschubrichtung 6 wird der von der Druckfeder 21 auf den Anschlag 5 ausgeübte Druck überwunden und dieser erfährt eine Relativbewegung entgegen der Vorschubrichtung 6, d.h. nach hinten, so daß der anfänglich mit geringem Abstand vor der Umlaufbahn der Sägekette 2 gehaltene Ast in die Umlaufebene der Sägekette 2 gelangt und durch stetiges Vordrücken des Tragschwertes 1 unter entsprechender weiterer Rückwärtsbewegung des Anschlags 5 und Zusammendrücken der Druckfeder 21 bei eingeschaltetem Motor fortschreitend abgesägt wird. Bei Beendigung des Sägevorgangs wird der Anschlag 5 von der Druckfeder 21 wieder selbsttätig in seine in der Zeichnung dargestellte Ausgangslage vorgedrückt.To saw off a branch, the support sword 1 is placed on the top of a trunk with the support shoe 15 of the stop 5. The underside 27 of the support shoe 15 is concavely curved to match the convex curvature of the tree trunk, as can be seen from FIG. 3. The support sword 1 is pushed in the feed direction 6, ie from behind, onto the branch with a sliding forward movement of the support shoe 15 until the branch is received and held in the receiving mouth of the stop 5. By further pushing the support sword 1 in the feed direction 6, the pressure exerted by the compression spring 21 on the stop 5 is overcome and this undergoes a relative movement against the feed direction 6, ie to the rear, so that the initially held at a short distance in front of the orbit of the saw chain 2 Branch in the orbital plane the saw chain 2 arrives and is sawn off progressively by steadily pressing the carrying sword 1 with a corresponding further backward movement of the stop 5 and compressing the compression spring 21 when the engine is switched on. At the end of the sawing process, the stop 5 is automatically pushed back into its starting position shown in the drawing by the compression spring 21.

Bei dieser Ausgestaltung und Handhabung der Säge können die mit herkömmlichen Motorsägen nur unter großen Schwierigkeiten absägbaren Äste im zuoberst befindlichen Bereich eines liegenden Stammes mit besonderer Leichtigkeit entfernt werden, weil in diesen Fällen das Tragschwert 1 mit dem Auflageschuh 15 einfach im oberen Wölbungsbereich des Stammes in gleitender Abstützung mit geringem Kraftaufwand geführt werden kann. Dank des sicheren Halts, den die abzusägenden Äste im Anschlag 5 während des Absägevorgangs bewahren, sind jedoch auch solche Äste, die eine andere Stellung am liegenden Stamm aufweisen, vergleichsweise leicht abzusägen. Zu der verringerten Unfallgefahr trägt der Umstand wesentlich bei, daß zum Entasten die Sägekette 2 nicht mit einem ihrer beiden Längstrume mit dem Ast in Schneideingriff gebracht werden muß, sondern mit ihrem vorderen Umlenkbereich, bei Nachführung des Tragschwerts 1 durch die Bedienungsperson von der entgegengesetzten Seite her, d.h. von hinten. Die einfache Handhabung ist ferner dadurch begünstigt, daß in der beschriebenen Weise parallel zur Längsrichtung des Stammes gearbeitet werden kann und die Säge bzw. das Tragschwert 1 beim Übergang zu einem anderen abzuschneidenden Ast stets nur um die Längsachse gedreht zu werden braucht.With this design and handling of the saw, the branches that can only be sawed off with great difficulty in the top area of a lying trunk can be removed with particular ease because in these cases the support sword 1 with the support shoe 15 simply slides in the upper arch area of the trunk Support can be performed with little effort. Thanks to the secure hold that the branches to be sawn off in the stop 5 during the sawing process, however, branches that have a different position on the lying log are comparatively easy to saw off. The fact that saw chain 2 does not have to be brought into cutting engagement with the branch with one of its two longitudinal strands, but with its front deflection area, when guiding the carrying sword 1 by the operator from the opposite side, contributes significantly to the reduced risk of accidents , ie from behind. The ease of use is further favored by the fact that it is possible to work in the manner described parallel to the longitudinal direction of the trunk and that the saw or the carrying sword 1 only ever has to be rotated about the longitudinal axis when transitioning to another branch to be cut off.

Claims (7)

1. A manually operated power saw having circulating cutting members which are guided by a holding and guiding device (1) and driven by means of a motor, and having a stop (5) provided on the holding and guiding device (1), characterised in that the stop (5) has two gripping arms (7, 8) which spread apart at an angle and which, with their adjacent inner sides (9, 10), form a receiving jaw for branches and the like material to be cut, the receiving jaw being mounted in front of the circulation path of the cutting members in the feed direction (6) of the saw, and in that the stop (5) is acted upon by spring force in the feed direction (6) and is movably supported on the holding and guiding device (1) for relative movement counter to the feed direction (6), overcoming the spring force.
2. A saw as claimed in claim 1, characterised in that the inner side (10) of the one gripping arm (8) which is directed counter to the direction of circulation (11) of the cutting members, is serrated.
3. A saw as claimed in claim 1 or 2, characterised in that the holding and guiding device (1) is formed from a plate rail or the like supporting unit which exposes the cutting members in places for engagement with the material to be cut and which is provided with a guideway (14) for the movement of the stop (5) engaging with a guide member (13) in the guideway.
4. A saw as claimed in any one of claims 1 to 3, characterised in that the stop (5) is provided with a rear spring bearing member (18) which bears against a compression spring (21) which acts on the stop in the feed direction (6) of the saw and the other end of which is supported in a spring housing (23) secured to the holding and guiding device (1).
5. A saw as claimed in any one of claims 1 to 4, characterised in that the stop (5) is provided with a supporting shoe (15) which engages under the holding and guiding device (1) and is movable jointly with the stop (5).
6. A saw as claimed in claim 5, characterised in that the under side (27) of the supporting shoe (15) is concavely arched.
7. A saw as claimed in any one of claims 1 to 6, characterised in that the cutting members are formed, in a manner known per se, from sawteeth rigidly connected to the chain links of a saw chain (2), the saw chain being guided on the circumference of an elongated, flat supporting blade comprising two opposite reversing regions for the saw chain, as a holding and guiding device (1), and in that the stop (5) is disposed at one reversing end (3) of the supporting blade while a motor housing containing the drive motor and having a handle device is fitted to the top (4) of the supporting blade in the opposite reversing region of the supporting blade.
EP82103869A 1981-07-22 1982-05-05 Portable power-driven saw Expired EP0070361B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT82103869T ATE18646T1 (en) 1981-07-22 1982-05-05 HAND-OPERATED CHAINSAW.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3128974 1981-07-22
DE19813128974 DE3128974A1 (en) 1981-07-22 1981-07-22 MANUAL CHAINSAW

Publications (3)

Publication Number Publication Date
EP0070361A2 EP0070361A2 (en) 1983-01-26
EP0070361A3 EP0070361A3 (en) 1983-11-16
EP0070361B1 true EP0070361B1 (en) 1986-03-19

Family

ID=6137493

Family Applications (1)

Application Number Title Priority Date Filing Date
EP82103869A Expired EP0070361B1 (en) 1981-07-22 1982-05-05 Portable power-driven saw

Country Status (3)

Country Link
EP (1) EP0070361B1 (en)
AT (1) ATE18646T1 (en)
DE (2) DE3128974A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2301061A (en) * 1995-05-26 1996-11-27 Francis Edward Kennaway Bolton A safety system for chain saws.

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2925105A (en) * 1956-12-18 1960-02-16 Ernest A Hayden Chain saw equipped with bar stops
US2902065A (en) * 1957-10-18 1959-09-01 Jerrimiah C Graves Power saw blade anchoring device
US2930416A (en) * 1958-02-17 1960-03-29 Granberg Elof Chain saw attachment
US3680607A (en) * 1970-06-29 1972-08-01 Vernon S Robinson Chain saw guide
DE2164372A1 (en) * 1971-12-23 1973-06-28 Stihl Maschf Andreas MOTORIZED SINGLE-MAN SAW
DE2735617A1 (en) * 1977-08-06 1979-02-15 Willi Hiemer Motorised saw for tree lopping from ground - has extensible holding unit between saw-blade and handle
US4270272A (en) * 1980-01-25 1981-06-02 Graham William W Brush cutting attachment for chain saw

Also Published As

Publication number Publication date
DE3269939D1 (en) 1986-04-24
DE3128974A1 (en) 1983-02-17
EP0070361A2 (en) 1983-01-26
EP0070361A3 (en) 1983-11-16
ATE18646T1 (en) 1986-04-15

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