EP0448849B1 - Boom for an excavator or similar - Google Patents
Boom for an excavator or similar Download PDFInfo
- Publication number
- EP0448849B1 EP0448849B1 EP90250314A EP90250314A EP0448849B1 EP 0448849 B1 EP0448849 B1 EP 0448849B1 EP 90250314 A EP90250314 A EP 90250314A EP 90250314 A EP90250314 A EP 90250314A EP 0448849 B1 EP0448849 B1 EP 0448849B1
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- EP
- European Patent Office
- Prior art keywords
- arm
- piston
- boom
- articulated
- cylinder unit
- 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
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/301—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom with more than two arms (boom included), e.g. two-part boom with additional dipper-arm
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F3/00—Dredgers; Soil-shifting machines
- E02F3/04—Dredgers; Soil-shifting machines mechanically-driven
- E02F3/28—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets
- E02F3/30—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom
- E02F3/32—Dredgers; Soil-shifting machines mechanically-driven with digging tools mounted on a dipper- or bucket-arm, i.e. there is either one arm or a pair of arms, e.g. dippers, buckets with a dipper-arm pivoted on a cantilever beam, i.e. boom working downwardly and towards the machine, e.g. with backhoes
Definitions
- the invention relates to a boom for a backhoe or the like, consisting of (at least) two articulated interconnected (representing boom sections) first and second arms, which by means of a piston-cylinder arrangement (generally consisting of two pistons arranged essentially parallel to each other -Cylinder units) are to be pivoted relative to one another, which runs in front of or below the connecting line through the two articulation points (on the device frame or on the second arm) of the first arm, the one (first) arm being articulated on the device frame and the Articulation point of the piston-cylinder arrangement on the second Arm is arranged at a distance from the articulation point of the second arm on the first arm.
- a piston-cylinder arrangement generally consisting of two pistons arranged essentially parallel to each other -Cylinder units
- Such a boom which is also referred to in practice as a "hydraulic adjustable boom” with regard to its regularly hydraulically operated piston-cylinder arrangement, can be found in the brochure "ATLAS 1704 mobile excavator” from Atlas Weyhausen H. Weyhausen KG Maschinenfabrik, D-27751 Delmenhorst, Known from July 1986, in which the piston-cylinder arrangement serves to stretch or shorten the (entire) boom according to the work to be done (or driving position) and is arranged on the front or bottom of the boom, and in such a way that the piston-cylinder arrangement consisting of two parallel, hydraulic piston-cylinder units is articulated at one end to a front lateral section of the first boom arm (laterally), while at its other end (with the two piston rods) is articulated on the side of the second arm.
- Such a generic design in which the piston-cylinder arrangement is arranged on the bottom or front of the boom, has the considerable advantage that the boom arm can be supported on the relatively large piston area of the piston-cylinder arrangement, which is particularly advantageous in particular with relatively large payloads or other loads.
- Another advantage of such an arrangement is that the location of the highest bending moment (in the second arm of the boom) does not lie where the two arms are connected to one another, especially since, as is well known, the torque for turning the Poor must be initiated.
- a certain disadvantage of this known boom arrangement is that the side profile of the boom is determined, among other things, by the piston-cylinder arrangement. Because both in the driving position (which is relatively uncritical) and in the working positions, the piston-cylinder arrangement with the sections of the two arms facing each other clearly forms a triangle, and the piston-cylinder units of the pistons are also in plan view or projection Cylinder arrangement in the above-described configuration from the prior art laterally at least over the second arm (usually over both arms).
- connection point between the two arms which is also referred to in practice as the clamping point, is at the same time the point of the highest bending moment in the (second) arm, so that, among other things, at the point of the highest occurring bending moment also the torque must be initiated and absorbed by / when the arm is turned, which in turn leads to considerably higher strength requirements.
- the object of the present invention is accordingly to improve the boom of the type described in the introduction, in particular while avoiding its aforementioned disadvantages, in particular in such a way that - with fundamentally the same (front paragraph) kinematics as are present in the boom described at the beginning on the prior art - a (considerably) smaller side profile can be achieved, both (and in particular) in a side plan view and in a plan view (projection) from above, in order in this way inter alia to enable work under difficult conditions without any problems, as is common in earthworks, with the boom very often having to be passed between shoring elements such as strut bars, which in some cases in the prior art. was not possible at all and often led to damage to the piston-cylinder arrangement.
- the solution to this problem is characterized in that the piston-cylinder arrangement runs at least partially - preferably essentially completely - within the first arm, and in order to achieve an even greater protective effect for the piston-cylinder arrangement preferably such that the Piston-cylinder arrangement is articulated on the device frame or on the second arm so that the cylinder (s) are at the top and the piston rod (s) are at the bottom.
- the piston-cylinder arrangement is preferably articulated on the underside of the second arm, and preferably in such a way that it runs essentially parallel to the longitudinal axis of the first arm.
- the drawing shows a generally designated 1 backhoe with an overall designated 2 boom, which - as far as the explanation of the above invention is concerned - consists essentially of two articulated (first and second) arms 3 and 4, respectively can be pivoted relative to one another by means of a piston-cylinder arrangement 5, the piston-cylinder arrangement 5 consisting of two piston-cylinder units 6 running parallel to one another, of which only one piston-cylinder unit can be seen in each of the two drawing figures is.
- the boom 2 per se has yet another (third) arm 7, which is connected in an articulated manner to the front end section of the second arm 4 and has the (deep) bucket 8 at its free end wearing.
- this third arm 7 is irrelevant to the present invention and is therefore essentially not considered in the following.
- the articulation point 14 of the piston-cylinder arrangement 5 on the second arm 4 is arranged at a distance a from the articulation point 15 of the second arm 4 on the first arm 3.
- the piston-cylinder arrangement 5 consisting of two piston-cylinder units 6, 6 which are parallel to one another is practically integrated into the first arm 3, that is to say is arranged essentially completely within the first arm 3 and runs essentially parallel to the longitudinal axis of the first arm 3, the piston-cylinder arrangement 5 being arranged recognizably on the underside 16 of the second arm 4, namely the two piston-cylinder units 6, 6 are each on a nose-shaped extension 17 of a side wall 18 of the second arm 4 articulated.
- the articulation point 19 of the piston-cylinder arrangement 5 on the first arm 3 is located just above the articulation point 9 of the first arm 3 on the device frame 10.
- the piston-cylinder arrangement 5 is articulated on the first arm 3 or on the second arm 4 in such a way that the two cylinders 5 'are each at the top and the piston rods 5''are at the bottom, so that the piston-cylinder arrangement 5 is not only is already excellently protected by its proposed integration into the first arm 3 of the arm 2, but also also such that (see FIG. 2) in cases where the piston-cylinder units 6, 6 (slightly) freely between the first arm 3 and the second arm 4 project (see Fig. 2), this free section is a cylinder section and not a piston rod section.
- the present invention has created a cantilever which - while avoiding all the disadvantages of the prior art - takes account of the requirements to be met of it in an almost optimal manner: the cantilever according to the invention does not have only in top view from the side, but also in top view from above or in the projection an extremely small side profile, so that it can work without difficulty even under difficult conditions, such as are common in earthworks, but it is also strength-wise ideally designed to the extent that the greatest bending moment does not occur at the junction between the first and second arm 3 or 4 of the arm 2, where, in addition, the torques also have to be introduced when turning; and finally, owing to the arrangement of the piston-cylinder arrangement 5 which is at least essentially integrated into the first arm 3 (“pillar”), an almost optimal protection of the piston-cylinder arrangement 5 against any external influences is achieved, although the - compared to one "Neck cylinder arrangement" - advantageous effect is retained, as set out at the beginning with reference to the previously described prior art.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Operation Control Of Excavators (AREA)
- Earth Drilling (AREA)
Abstract
Description
Die Erfindung betrifft einen Ausleger für einen Löffelbagger od.dgl., bestehend aus (wenigstens) zwei gelenkig miteinander verbundenen (Auslegerabschnitte darstellenden) ersten und zweiten Armen, die mittels einer Kolben-Zylinder-Anordnung (i.a. bestehend aus zwei im wesentlichen parallel zueinander angeordneten Kolben-Zylinder-Einheiten) relativ zueinander zu verschwenken sind, welche vor- bzw. unterhalb der Verbindungslinie durch die beiden Anlenkstellen (am Geräterahmen bzw. am zweiten Arm) des ersten Armes verläuft, wobei der eine (erste) Arm am Geräterahmen angelenkt ist und die Anlenkstelle der Kolben-Zylinder-Anordnung am zweiten Arm mit Abstand zur Anlenkstelle des zweiten Armes am ersten Arm angeordnet ist.The invention relates to a boom for a backhoe or the like, consisting of (at least) two articulated interconnected (representing boom sections) first and second arms, which by means of a piston-cylinder arrangement (generally consisting of two pistons arranged essentially parallel to each other -Cylinder units) are to be pivoted relative to one another, which runs in front of or below the connecting line through the two articulation points (on the device frame or on the second arm) of the first arm, the one (first) arm being articulated on the device frame and the Articulation point of the piston-cylinder arrangement on the second Arm is arranged at a distance from the articulation point of the second arm on the first arm.
Ein solcher im Hinblick auf seine regelmäßig hydraulisch betriebene Kolben-Zylinder-Anordnung in der Praxis auch als "hydraulischer Verstellausleger" bezeichneter Ausleger ist aus dem Prospekt "ATLAS 1704 Mobilbagger" der Fa. Atlas Weyhausen H. Weyhausen KG Maschinenfabrik, D-27751 Delmenhorst, von Juli 1986 bekannt, bei dem die Kolben-Zylinder-Anordnung jeweils nach der zu bewältigenden Arbeitsaufgabe (bzw. Fahrstellung) zum Strecken bzw. zum verkürzen des (gesamten) Auslegers dient und an der Vorder- bzw. Unterseite des Auslegers angeordnet ist, und zwar derart, daß die aus zwei parallelen, hydraulischen Kolben-Zylinder-Einheiten bestehende Kolben-Zylinder-Anordnung an ihrem einen Ende an einem vorderen seitlichen Abschnitt des ersten Auslegerarmes (seitlich) angelenkt ist, während sie an ihrem anderen Ende (und zwar mit den beiden Kolbenstangen) seitlich am zweiten Arm angelenkt ist.Such a boom, which is also referred to in practice as a "hydraulic adjustable boom" with regard to its regularly hydraulically operated piston-cylinder arrangement, can be found in the brochure "ATLAS 1704 mobile excavator" from Atlas Weyhausen H. Weyhausen KG Maschinenfabrik, D-27751 Delmenhorst, Known from July 1986, in which the piston-cylinder arrangement serves to stretch or shorten the (entire) boom according to the work to be done (or driving position) and is arranged on the front or bottom of the boom, and in such a way that the piston-cylinder arrangement consisting of two parallel, hydraulic piston-cylinder units is articulated at one end to a front lateral section of the first boom arm (laterally), while at its other end (with the two piston rods) is articulated on the side of the second arm.
Eine derartige gattungsgemäße Ausbildung, bei welcher die Kolben-Zylinder-Anordnung an der Unter- bzw. Vorderseite des Auslegers angeordnet ist, bringt den erheblichen Vorteil mit sich, daß sich der Auslegerarm auf der verhältnismäßig großen Kolbenfläche der Kolben-Zylinder-Anordnung abstützen kann, was insbesondere bei relativ großen Trag- oder sonstigen Lasten besonders vorteilhaft ist.Such a generic design, in which the piston-cylinder arrangement is arranged on the bottom or front of the boom, has the considerable advantage that the boom arm can be supported on the relatively large piston area of the piston-cylinder arrangement, which is particularly advantageous in particular with relatively large payloads or other loads.
Ein weiterer Vorteil einer solchen Anordnung liegt ersichtlich darin, daß die Stelle des höchsten auftretenden Biegemomentes (im zweiten Arm des Auslegers) nicht dort liegt, wo die beiden Arme miteinander verbunden sind, zumal an der Verbindungsstelle bekanntlich auch noch das Drehmoment zum/beim Verdrehen des Armes eingeleitet werden muß.Another advantage of such an arrangement is that the location of the highest bending moment (in the second arm of the boom) does not lie where the two arms are connected to one another, especially since, as is well known, the torque for turning the Poor must be initiated.
Ein gewisser Nachteil dieser vorbekannten Auslegeranordnung besteht darin, daß das Seitenprofil des Auslegers u. a. durch die Kolben-Zylinder-Anordnung mitbestimmt wird. Denn sowohl in der Fahrstellung (was relativ unkritisch ist) als auch in den Arbeitsstellungen bildet die Kolben-Zylinder-Anordnung mit den einander zugekehrten Abschnitten der beiden Arme ersichtlich ein Dreieck, und auch in der Draufsicht bzw. Projektion stehen die Kolben-Zylinder-Einheiten der Kolben-Zylinder-Anordnung bei der vorstehend beschriebenen Ausbildung aus dem Stand der Technik seitlich zumindest über den zweiten Arm (in der Regel über beide Arme) über.A certain disadvantage of this known boom arrangement is that the side profile of the boom is determined, among other things, by the piston-cylinder arrangement. Because both in the driving position (which is relatively uncritical) and in the working positions, the piston-cylinder arrangement with the sections of the two arms facing each other clearly forms a triangle, and the piston-cylinder units of the pistons are also in plan view or projection Cylinder arrangement in the above-described configuration from the prior art laterally at least over the second arm (usually over both arms).
In dem Bestreben, das Seitenprofil (in Seitenansicht) zu verkleinern, damit die Kolben-Zylinder-Anordnung die auszuführenden Baggerarbeiten od.dgl. nicht behindert, ist darüber hinaus eine Ausgestaltung bekanntgeworden, bei welcher die Kolben-Zylinder-Anordnung in der Art sog. Nackenzylinder ausgebildet ist (s. z.B. DE-GM 85 12 238.6). Bei einer solchen Auslegerausbildung ist zwar das Seitenprofil relativ günstig, doch wird dieses mit erheblichen technischen Nachteilen erkauft. Denn bei einer Ausgestaltung, wie sie bspw. aus der DE-GM 85 12 238 bekanntgeworden ist, wird ersichtlich die Ringseite der als sog. Nackenzylinder angeordneten Kolben-Zylinder-Anordnung insbesondere im Bereich höchster Traglast außerordentlich hoch belastet, muß mithin von vornherein entsprechend robust dimensioniert werden, und leidet in extremen Lastfällen dennoch (z.T. erheblich) unter der Auslegeranordnung.In an effort to reduce the side profile (in side view) so that the piston-cylinder arrangement or the like to be carried out dredging. In addition, an embodiment in which the piston-cylinder arrangement is designed in the manner of so-called neck cylinders has become known (see e.g. DE-GM 85 12 238.6). With such a boom design, the side profile is relatively cheap, but this is purchased with considerable technical disadvantages. Because with an embodiment such as has become known, for example, from DE-GM 85 12 238, the ring side of the piston-cylinder arrangement arranged as a so-called neck cylinder is extremely heavily loaded, particularly in the area of the highest load, must therefore be appropriately robust from the outset dimensioned, and still suffers (sometimes considerably) from the boom arrangement in extreme load cases.
Als weiterer wesentlicher Nachteil kommt hinzu, daß bei der vorstehend erörterten Auslegerausgestaltung die in der Praxis auch als Einspannstelle bezeichnete Verbindungsstelle zwischen den beiden Armen zugleich die Stelle des höchsten Biegemomentes im (zweiten) Arm ist, so daß mithin an der Stelle des höchsten auftretenden Biegemomentes u.a. auch das Drehmoment durch/beim Verdrehen des Armes eingeleitet und aufgenommen werden muß, was wiederum zu erheblich höheren Festigkeitsanforderungen führt.A further significant disadvantage is that in the boom configuration discussed above, the connection point between the two arms, which is also referred to in practice as the clamping point, is at the same time the point of the highest bending moment in the (second) arm, so that, among other things, at the point of the highest occurring bending moment also the torque must be initiated and absorbed by / when the arm is turned, which in turn leads to considerably higher strength requirements.
Der vorliegenden Erfindung liegt demgemäß die Aufgabe zugrunde, den Ausleger der eingangs beschriebenen Gattung insbesondere unter Vermeidung seiner vorgenannten Nachteile insbesondere dahingehend zu verbessern, daß - bei grundsätzlich gleicher (vorderer Absatz) Kinematik, wie sie bei dem eingangs beschriebenen Ausleger zum Stand der Technik vorliegt - ein (erheblich) kleineres Seitenprofil zu erzielen ist, und zwar sowohl (und insbesondere) in seitlicher Draufsicht als auch in Draufsicht (Projektion) von oben, um auf diese Weise u.a. auch ein Arbeiten unter erschwerten Bedingungen problemlos zu ermöglichen, wie sie im Erdbau nun einmal üblich sind, wobei der Ausleger sehr häufig zwischen Verbauelementen wie Strebstangen hindurchgeführt werden muß, was beim Stand der Technik z.T. überhaupt nicht möglich war und im übrigen häufig zu Beschädigungen der Kolben-Zylinder-Anordnung geführt hat.The object of the present invention is accordingly to improve the boom of the type described in the introduction, in particular while avoiding its aforementioned disadvantages, in particular in such a way that - with fundamentally the same (front paragraph) kinematics as are present in the boom described at the beginning on the prior art - a (considerably) smaller side profile can be achieved, both (and in particular) in a side plan view and in a plan view (projection) from above, in order in this way inter alia to enable work under difficult conditions without any problems, as is common in earthworks, with the boom very often having to be passed between shoring elements such as strut bars, which in some cases in the prior art. was not possible at all and often led to damage to the piston-cylinder arrangement.
Die Lösung dieser Aufgabe ist erfindungsgemäß dadurch gekennzeichnet, daß die Kolben-Zylinder-Anordnung wenigstens teilweise - vorzugsweise im wesentlichen vollständig - innerhalb des ersten Armes verläuft, und zwar zur Erzielung einer noch erhöhten Schutzwirkung für die Kolben-Zylinder-Anordnung bevorzugt derart, daß die Kolben-Zylinder-Anordnung so am Geräterahmen bzw. am zweiten Arm angelenkt ist, daß der (die) Zylinder oben und die Kolbenstange(n) unten liegt (liegen).The solution to this problem is characterized in that the piston-cylinder arrangement runs at least partially - preferably essentially completely - within the first arm, and in order to achieve an even greater protective effect for the piston-cylinder arrangement preferably such that the Piston-cylinder arrangement is articulated on the device frame or on the second arm so that the cylinder (s) are at the top and the piston rod (s) are at the bottom.
Die Kolben-Zylinder-Anordnung ist bevorzugt an der Unterseite des zweiten Armes angelenkt, und zwar bevorzugt derart, daß sie im wesentlichen parallel zur Längsachse des ersten Armes verläuft.The piston-cylinder arrangement is preferably articulated on the underside of the second arm, and preferably in such a way that it runs essentially parallel to the longitudinal axis of the first arm.
Bevorzugte Ausgestaltungen der vorliegenden Erfindung sind in den Unteransprüchen beschrieben.Preferred configurations of the present invention are described in the subclaims.
Die Erfindung ist nachstehend an einem Ausführungsbeispiel unter Bezugnahme auf eine Zeichnung weiter erläutert. Es zeigt:
- Fig. 1
- eine Seitenansicht eines mit einem erfindungsgemäßen Ausleger versehenen (Tieflöffel-)Baggers in Fahrstellung; und
- Fig. 2
- den (verkleinert dargestellten) Bagger gemäß Fig. 1 in einem sog. Bewegungsbild.
- Fig. 1
- a side view of a (backhoe) excavator provided with a boom according to the invention in the driving position; and
- Fig. 2
- the (shown reduced) excavator according to FIG. 1 in a so-called motion picture.
Die Zeichnung zeigt einen im ganzen mit 1 bezeichneten Tieflöffelbagger mit einem im ganzen mit 2 bezeichneten Ausleger, der - soweit die Erläuterung der vorstehenden Erfindung betroffen ist - im wesentlichen aus zwei gelenkig miteinander verbundenen (ersten und zweiten) Armen 3 bzw. 4 besteht, die mittels einer Kolben-Zylinder-Anordnung 5 relativ zueinander zu verschwenken sind, wobei die Kolben-Zylinder-Anordnung 5 aus zwei zueinander parallel verlaufenden Kolben-Zylinder-Einheiten 6 besteht, von denen in den beiden Zeichnungsfiguren nur jeweils eine Kolben-Zylinder-Einheit erkennbar ist.The drawing shows a generally designated 1 backhoe with an overall designated 2 boom, which - as far as the explanation of the above invention is concerned - consists essentially of two articulated (first and second)
Wie für den einschlägigen Fachmann ohne weiteres erkennbar ist, weist der Ausleger 2 an sich noch einen weiteren (dritten) Arm 7 auf, der gelenkig mit dem vorderen Endabschnitt des zweiten Arms 4 verbunden ist und an seinem freien Ende den (Tief-)Löffel 8 trägt. Dieser dritte Arm 7 ist jedoch für die vorliegende Erfindung unerheblich und bleibt daher im folgenden im wesentlichen außer Betrachtung.As can be readily recognized by the relevant person skilled in the art, the
Der erste Arm 3 des Auslegers 2, der in der Praxis auch als "Säule" bezeichnet wird, ist bei 9 am Geräterahmen 10 angelenkt, genauer gesagt am Oberrahmen 11 des Geräterahmens 10, der um eine (vertikale) Drehachse 12 relativ zum Unterrahmen 13 dreh- bzw. schwenkbar ist.The
Weiterhin ist aus der Zeichnung erkennbar, daß die Anlenkstelle 14 der Kolben-Zylinder-Anordnung 5 am zweiten Arm 4 mit Abstand a zur Anlenkstelle 15 des zweiten Arms 4 am ersten Arm 3 angeordnet ist.Furthermore, it can be seen from the drawing that the articulation point 14 of the piston-
Wie bereits dargelegt worden ist, ist die aus zwei zueinander parallelen Kolben-Zylinder-Einheiten 6, 6 bestehende Kolben-Zylinder-Anordnung 5 praktisch in den ersten Arm 3 integriert, also im wesentlichen vollständig innerhalb des ersten Armes 3 angeordnet und verläuft im wesentlichen parallel zur Längsachse des ersten Armes 3, wobei die Kolben-Zylinder-Anordnung 5 erkennbar an der Unterseite 16 des zweiten Armes 4 angeordnet ist, und zwar sind die beiden Kolben-Zylinder-Einheiten 6, 6 jeweils an einer nasenförmigen Verlängerung 17 einer Seitenwand 18 des zweiten Armes 4 angelenkt.As has already been explained, the piston-
Die Anlenkstelle 19 der Kolben-Zylinder-Anordnung 5 am ersten Arm 3 liegt kurz oberhalb der Anlenkstelle 9 des ersten Armes 3 am Geräterahmen 10.The
Die Kolben-Zylinder-Anordnung 5 ist so am ersten Arm 3 bzw. am zweiten Arm 4 angelenkt, daß die beiden Zylinder 5' jeweils oben und die Kolbenstangen 5'' jeweils unten liegen, so daß die Kolben-Zylinder-Anordnung 5 nicht nur durch ihre erfindungsgemäß vorgesehene Integration in den ertsen Arm 3 des Auslegers 2 bereits hervorragend geschützt ist, sondern darüber hinaus auch noch dergestalt, daß (s. Fig. 2) in Fällen, in denen die Kolben-Zylinder-Einheiten 6, 6 (geringfügig) frei zwischen dem ersten Arm 3 und dem zweiten Arm 4 vorstehen (s. Fig. 2), dieser freie Abschnitt ein Zylinder-abschnitt ist und nicht ein Kolbenstangenabschnitt.The piston-
Wie für den zuständigen Fachmann ohne weiteres erkennbar und nachvollziehbar ist, wurde mit der vorliegenden Erfindung ein Ausleger geschaffen, der - unter Vermeidung sämtlicher Nachteile des Standes der Technik - den an ihn zu stellenden Anforderungen in geradezu optimaler Weise Rechnung trägt: Der erfindungsgemäße Ausleger besitzt nicht nur in seitlicher Draufsicht, sondern auch in Draufsicht von oben bzw. in der Projektion ein extrem kleines Seitenprofil, so daß er auch unter erschwerten Bedingungen, wie sie im Erdbau fast regelmäßig üblich sind, problemlos arbeiten kann, sondern er ist darüber hinaus auch festigkeitsmäßig schon insoweit ideal ausgestaltet, als das größte Biegemoment nicht an der Verbindungsstelle zwischen erstem und zweiten Arm 3 bzw. 4 des Auslegers 2 auftritt, wo darüber hinaus beim Drehen auch noch die Drehmomente eingeleitet werden müssen; und schließlich wird aufgrund der zumindest im wesentlichen in den ersten Arm 3 ("Säule") integrierten Anordnung der Kolben-Zylinder-Anordnung 5 ein geradezu optimaler Schutz der Kolben-Zylinder-Anordnung 5 gegen irgendwelche äußeren Einflüsse erreicht, wobei dennoch die - gegenüber einer "Nackenzylinderanordnung" - vorteilhafte Wirkung erhalten bleibt, wie sie eingangs unter Bezugnahme auf den zuerst geschilderten vorbekannten Stand der Technik dargelegt worden ist.As can be readily recognized and understood by the person skilled in the art, the present invention has created a cantilever which - while avoiding all the disadvantages of the prior art - takes account of the requirements to be met of it in an almost optimal manner: the cantilever according to the invention does not have only in top view from the side, but also in top view from above or in the projection an extremely small side profile, so that it can work without difficulty even under difficult conditions, such as are common in earthworks, but it is also strength-wise ideally designed to the extent that the greatest bending moment does not occur at the junction between the first and
Claims (5)
- A boom (2) for a power excavator (1), consisting of a hydraulic adjustable boom (3, 4) having a first arm (3) articulated at one end portion (at 9) on the machine frame (10) and supported thereon and pivotable thereto by means of a first piston and cylinder unit, and a second arm (4) which is bent at an angle to the first arm and is articulated on its other end portion (at 15), the two arms (3, 4) being pivotable relatively to one another by means of a second piston and cylinder unit (5), which, as considered in the direction of travel, is disposed in front of the line connecting the two points of articulation (9, 15) of the first arm (3), the point of articulation (14) of the second piston cylinder unit on the second arm (4) being disposed, as considered in the direction of travel, at a distance in front of the point of articulation (15) of the two arms (3, 4), and of a third arm (7) which is articulated at the free end of the adjustable boom (3, 4) and which is pivotable by means of a third piston and cylinder unit relatively to the second arm (4) of the adjustable boom (3, 4), the shovel (8) being articulated on the free end portion of the third arm (7), characterised in that the second piston and cylinder unit (5) operative between the two arms (3, 4) of the adjustable boom is disposed substantially completely inside the first arm (3) and - extending in the longitudinal direction of the first arm (3) - is articulated on the underside (16) of the second arm (4) at its end remote from the first arm (3).
- A boom according to claim 1, characterised in that the side walls (18, 18) of the second arm (4) are extended downwards (at 17) in the form of a nose at the point of articulation of the second piston and cylinder unit (5).
- A boom according to claim 1 or 2, characterised in that the point of articulation (19) of the second piston and cylinder unit (5) on the first arm (3) is situated just above its point of articulation (9) on the machine frame (10).
- A boom according to one or more of the preceding claims, more particularly according to claim 3, characterised in that the second piston and cylinder unit (5) consists in manner known per se of two substantially parallel piston and cylinder units (6, 6).
- A boom according to one or more of the preceding claims, characterised in that the second piston and cylinder unit (5) is so articulated on the first arm (3) and on the second arm (4) that the or each cylinder (5') is situated at the top and the or each piston rod (5'') is situated at the bottom.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE9003519U | 1990-03-27 | ||
| DE9003519U DE9003519U1 (en) | 1990-03-27 | 1990-03-27 | Boom for a backhoe or similar |
| DE9006068U DE9006068U1 (en) | 1990-03-27 | 1990-05-26 | Boom for a backhoe or similar |
| DE9006068U | 1990-05-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0448849A1 EP0448849A1 (en) | 1991-10-02 |
| EP0448849B1 true EP0448849B1 (en) | 1994-11-09 |
Family
ID=25956422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP90250314A Expired - Lifetime EP0448849B1 (en) | 1990-03-27 | 1990-12-18 | Boom for an excavator or similar |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0448849B1 (en) |
| AT (1) | ATE114011T1 (en) |
| ES (1) | ES2063910T3 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE69514699T2 (en) * | 1994-03-07 | 2000-05-31 | Hitachi Construction Machinery Co., Ltd. | Swing excavator |
| DE10321070B3 (en) * | 2003-05-10 | 2004-11-04 | O & K Orenstein & Koppel Gmbh | Divided boom for an excavator has a lower part which is resistant to twisting in its upper end and is inserted from below into an upper part |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3042233A (en) * | 1958-12-15 | 1962-07-03 | Koehring Co | Multiple joint backhoe |
| EP0226657B1 (en) * | 1985-12-23 | 1990-01-31 | Kabushiki Kaisha Komatsu Seisakusho | Apparatus for operating working element of excavator |
-
1990
- 1990-12-18 EP EP90250314A patent/EP0448849B1/en not_active Expired - Lifetime
- 1990-12-18 AT AT90250314T patent/ATE114011T1/en not_active IP Right Cessation
- 1990-12-18 ES ES90250314T patent/ES2063910T3/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| ATE114011T1 (en) | 1994-11-15 |
| EP0448849A1 (en) | 1991-10-02 |
| ES2063910T3 (en) | 1995-01-16 |
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