EP0202545A1 - Dipper stick, in particular for a bucket excavator - Google Patents

Dipper stick, in particular for a bucket excavator Download PDF

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Publication number
EP0202545A1
EP0202545A1 EP86106281A EP86106281A EP0202545A1 EP 0202545 A1 EP0202545 A1 EP 0202545A1 EP 86106281 A EP86106281 A EP 86106281A EP 86106281 A EP86106281 A EP 86106281A EP 0202545 A1 EP0202545 A1 EP 0202545A1
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EP
European Patent Office
Prior art keywords
arm
dipper
wear
bucket
spoon
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.)
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Application number
EP86106281A
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German (de)
French (fr)
Inventor
Gregory Keith Werner
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.)
Deere and Co
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Deere and Co
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Filing date
Publication date
Application filed by Deere and Co filed Critical Deere and Co
Publication of EP0202545A1 publication Critical patent/EP0202545A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
    • B66C23/62—Constructional features or details
    • B66C23/64—Jibs
    • B66C23/70—Jibs constructed of sections adapted to be assembled to form jibs or various lengths
    • B66C23/701—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic
    • B66C23/707—Jibs constructed of sections adapted to be assembled to form jibs or various lengths telescopic guiding devices for telescopic jibs
    • 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
    • E02F3/306—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 telescopic dipper-arm or boom

Definitions

  • the invention relates to a bucket arm, in particular for a backhoe bucket, which is designed as a hollow profile with a rectangular or roughly rectangular cross-section and in its interior accommodates a retractable and extendable dipper arm with an adapted outer profile, which has a top and bottom wall, the ceilings - And the bottom wall are provided on their outer sides with mutually spaced wear bands.
  • Such backhoe buckets are usually used for dredging trenches and the like. They are normally arranged at the rear of a vehicle so as to be pivotable about a vertical axis and have a cantilever arm which is adjustable about this vertical axis and to which in turn a spoon arm is articulated in a vertically pivotable manner.
  • the excavation tool also known as a spoon, engages the free end of this spoon arm, a spoon arm being provided between the excavation tool and the spoon arm in order to increase the variety of possible uses, which can be telescopically inserted into the spoon arm. In this way, the total length of the spoon arm can be increased considerably.
  • the backhoe bucket is constantly pivoted around its joints, and in addition, if there is a retractable and extendable dipper arm, it is constantly retracted and extended. Due to the constant retraction and extension, considerable wear and tear occurs on its surfaces and on the inside of the bucket arm, which sooner or later precludes secure use. It has therefore started to provide rollers, but this has increased the overall weight of the bucket considerably. On the other hand, it has already been proposed in the spoon arm from which the invention is based (US Pat. No. 3,688,930) to provide the spoon arm with wear bands on its top and bottom walls.
  • wear straps need to be as in the Practice has shown to be replaced about every 300 hours of operation, and they also have a considerably greater hardness than the material of the bucket arm, which causes the wear straps to grind or eat into the inside of the bucket arm, which means that even after the wear straps have been replaced, the dipper arm can no longer be safely guided, so that the spoon arm may have to be replaced.
  • the object to be achieved with the invention is seen in designing the arm and arm in such a way that they are exposed to even less wear.
  • This object has been achieved according to the invention in that the insides of the top and bottom walls of the arm, which are located on the top and bottom of the arm, are provided with wear bands which bear against the wear bands on the arm.
  • the wear bands of the spoon arm and those of the dipper arm are constantly in contact with each other during the mutual displacement, so that since they have a much greater hardness than the material of the dipper arm and that of the dipper arm, there is substantially less wear and thus a considerably greater usability of the bucket is given.
  • At least one wear band preferably that of the dipper stick, can expediently be arranged detachably, with a detachable arrangement of all wear bands also being recommended in some cases.
  • the wear bands can rest against one another over their entire length when the dipper arm is retracted. At this point it should of course be pointed out that it is not absolutely necessary for the dipper stick to be inserted into the dipper arm. It is equally possible that the dipper stick moves on the dipper arm, so that in such a case the wear straps can also be attached accordingly.
  • a bucket connected to an indicated vehicle is designated 11, which has a pivoting part 13, which in turn is connected via a pin to the vehicle or an agricultural tractor frame for pivoting movement about a vertical axis.
  • the boom of the bucket is designated 17 and connected to the swivel part 13 by conventional means and provided with an extension arm 19 which rigidly engages the swivel part 13 at one end.
  • a bucket arm 21 is pivotally connected to the other end of the extension arm 19, wherein a vertical pivoting movement can be generated via a hydraulically actuated actuating cylinder 23.
  • the latter in turn is connected at one end to the cantilever arm 19, while its other end, for example on the piston side, engages the bucket arm 21 so that the bucket arm can be adjusted about a horizontal axis.
  • the spoon arm 21 consists of a housing which is formed by first and second, longitudinally extending parts 31 and 33 which essentially have an inverted L-shaped cross section.
  • the parts 31 and 33 extend vertically with their long legs and are connected to one another at their lower ends by a longitudinal part 35 which forms the underside of the spoon arm connected.
  • the short legs of the parts 31 and 33 which are of L-shaped cross section, do not lie against one another, as can be seen in particular in FIG. 3, and thus form a slot 37 between them.
  • the spoon arm therefore rightly consists of a hollow profile-like housing slotted on its upper side - or approximately rectangular cross-section.
  • the vertically oriented regions of the parts 31 and 33 can also be referred to as side walls 31 and 33 and the horizontally oriented short legs of the parts 31 and 33 as the upper side 39. Part 35 thus forms the underside.
  • an end stiffener 45 is provided, which is located at the free end 47 of the spoon arm 21.
  • a partially slotted back plate 49 is fixedly connected to the top 39 at the other end of the spoon arm 21 by conventional means.
  • stiffening rails 51 are provided on the top 39 of the spoon arm.
  • An extendable and extendable dipper stick is designated 53 and is received by the interior of the dipper arm 21 in a telescopic manner, which will be explained in more detail below.
  • the dipper arm 53 also consists of a housing made of a hollow profile with a top wall 55 and a bottom wall 57 and side parts 59 and 61.
  • a hydraulically actuatable actuating cylinder 63 can be pivoted inside the dipper arm in the region of its front end between the side walls 31 and 33 via conventional ones Means attached. The other end of this actuating cylinder 63 pivotally engages the dipper arm 53 via conventional means provided between the side parts thereof. The dipper stick can thus be moved into and out of the dipper arm via this adjusting cylinder 63.
  • a spoon 64 is pivotally connected to the free end of the spoon arm 53, a linkage 65 additionally being provided, by means of which the spoon is extended by means of a wide Ren actuator cylinder 67 can be adjusted in its various operating positions.
  • a bearing 86 which is fixedly connected to the ceiling wall 55 of the arm 53 by conventional means and from there extends through the slot 37 in the top 39 from the arm and up and pivots the actuating cylinder.
  • the other end of the actuating cylinder 67 is connected to the linkage 65, and the bucket 64 can be actuated accordingly.
  • wear bands are provided on the inside of the bucket arm 21 and on the outside of the dipper arm 53.
  • These wear straps have a much greater hardness than the material of the bucket arm and the dipper stick and can be made, for example, of hardened steel with a Rockwell C hardness of 42.
  • 2 wear bands 70 are connected along the slot 37 to the inside of the upper side 39 of the spoon arm 21 by conventional means.
  • two further wear bands 72 are provided with the inside of the underside 35 opposite the bands 70.
  • a third pair of wear straps 78 is releasably disposed via conventional means on the outside of the bottom wall 57 of the dipper stick 53 in such a way that it lies opposite the wear straps 72, whereby all wear straps can lie against one another.
  • a fourth pair of wear straps 80 is releasable, so that it can also be easily replaced, by conventional means provided on the outside of the top wall 55 of the dipper stick so that they lie against the wear straps 70 over their entire length when the dipper stick has been inserted into the dipper arm is.
  • Fifth and sixth pairs of wear Bands 74 and 76 is still releasably connected by conventional means to the inside of the corresponding side parts 59 and 61 of the dipper arm and arranged such that they are opposite one another.
  • the dipper arm 53 is arranged in a telescopic manner in the dipper arm 21, there is a sliding contact between the wear bands 70 and 80 as well as between the wear bands 72 and 78 during the sliding movement. This contact also absorbs the essential weight of the dipper arm with a spoon .
  • the wear bands 74 and 75 need only lie against the inner sides of the corresponding side walls 31 and 33 of the spoon arm 21. Here, sliding along the walls without the presence of additional wear bands can be accepted, since the critical area of wear of the dipper stick occurs between the surfaces of the wear bands 72 and 78 as well as 70 and 80.

Abstract

The dipper arm is designed as a hollow section with a rectangular or roughly rectangular cross-section and accommodates in its interior a retractable and extendable dipper boom with an adapted outer section which has a top wall (55) and a bottom wall (57), in which arrangement the top wall (55) and the bottom wall (57), on their outsides, are provided with wear strips (78, 80) which are at a mutual distance apart, and the insides of the top and bottom side (39, 35) of the dipper arm (21) which are added to the top wall (55) and the bottom wall (57) of the dipper boom (53) are provided with wear strips (70, 72) which bear against the wear strips (78, 80) on the dipper boom (53). <IMAGE>

Description

Die Erfindung bezieht sich auf einen Löffelarm, insbesondere für einen Tieflöffel, der als Hohlprofil mit recht-oder etwa rechteckigem Querschnitt ausgebildet und in seinem Inneren einen ein- und ausfahrbaren Löffelstiel mit angepaßtem Außenprofil aufnimmt, der eine Decken- und Bodenwand aufweist, wobei die Decken- und die Bodenwand an ihren Außenseiten mit gegenseitigem Abstand aufweisenden Verschleißbändern versehen sind.The invention relates to a bucket arm, in particular for a backhoe bucket, which is designed as a hollow profile with a rectangular or roughly rectangular cross-section and in its interior accommodates a retractable and extendable dipper arm with an adapted outer profile, which has a top and bottom wall, the ceilings - And the bottom wall are provided on their outer sides with mutually spaced wear bands.

Derartige Tieflöffel dienen in der Regel zum Ausbaggern von Gräben und dergleichen. Sie sind normalerweise am Heck eines Fahrzeuges um eine vertikale Achse verschwenkbar angeordnet und weisen einen um diese vertikale Achse verstellbaren Auslegerarm auf, an den wiederum ein Löffelarm vertikal schwenkbar angelenkt ist. An das freie Ende dieses Löffelarms greift das Ausgrabwerkzeug, auch Löffel genannt, an, wobei zwischen dem Ausgrabwerkzeug und dem Löffelarm, um die Vielfältigkeit der Einsatzmöglichkeiten noch zu erhöhen, ein Löffelstiel vorgesehen ist, der teleskopisch in den Löffelarm eingefahren werden kann. Hierdurch läßt sich also die Gesamtlänge des Löffelarms erheblich vergrößern. Während des Einsatzes wird nun der Tieflöffel ständig um seine Gelenke verschwenkt, wobei darüber hinaus noch beim Vorhandensein eines ein- und ausfahrbaren Löffelstiels dieser ständig ein- und ausgefahren wird. Durch das ständige Ein- und Ausfahren tritt an seinen Oberflächen und an den Innenseiten des Löffelarms ein erheblicher Verschleiß auf, der früher oder später einen gesicherten Einsatz ausschließt. Man ist deshalb dazu übergegangen, Rollen vorzusehen, wodurch allerdings das Gesamtgewicht des Tieflöffels erheblich vergrößert wurde. Andererseits ist bereits bei dem Löffelarm, von dem die Erfindung ausgeht (US-A-3 688 930) vorgeschlagen worden, den Löffelstiel an seiner Decken- und Bodenwand mit Verschleißbändern zu versehen. Diese Verschleißbänder müssen, wie sich in der Praxis gezeigt hat, etwa alle 300 Betriebsstunden ausgewechselt werden, und sie weisen darüber hinaus eine erheblich größere Härte als der Werkstoff des Löffelarms auf, wodurch sich die Verschleißbänder in die Innenseite des Löffelarms einschleifen bzw. einfressen, wodurch auch nach einem Ersatz der Verschleißbänder der Löffelstiel nicht mehr sicher geführt werden kann, so daß unter Umständen der Löffelarm ersetzt werden muß.Such backhoe buckets are usually used for dredging trenches and the like. They are normally arranged at the rear of a vehicle so as to be pivotable about a vertical axis and have a cantilever arm which is adjustable about this vertical axis and to which in turn a spoon arm is articulated in a vertically pivotable manner. The excavation tool, also known as a spoon, engages the free end of this spoon arm, a spoon arm being provided between the excavation tool and the spoon arm in order to increase the variety of possible uses, which can be telescopically inserted into the spoon arm. In this way, the total length of the spoon arm can be increased considerably. During use, the backhoe bucket is constantly pivoted around its joints, and in addition, if there is a retractable and extendable dipper arm, it is constantly retracted and extended. Due to the constant retraction and extension, considerable wear and tear occurs on its surfaces and on the inside of the bucket arm, which sooner or later precludes secure use. It has therefore started to provide rollers, but this has increased the overall weight of the bucket considerably. On the other hand, it has already been proposed in the spoon arm from which the invention is based (US Pat. No. 3,688,930) to provide the spoon arm with wear bands on its top and bottom walls. These wear straps need to be as in the Practice has shown to be replaced about every 300 hours of operation, and they also have a considerably greater hardness than the material of the bucket arm, which causes the wear straps to grind or eat into the inside of the bucket arm, which means that even after the wear straps have been replaced, the dipper arm can no longer be safely guided, so that the spoon arm may have to be replaced.

Die mit der Erfindung zu lösende Aufgabe wird darin gesehen, Löffelarm und Löffelstiel derart auszubilden, daß sie noch weniger Verschleiß ausgesetzt sind. Diese Aufgabe ist nach der Erfindung dadurch gelöst worden, daß die Innenseiten der der Decken- und Bodenwände des Löffelstiels zugelegenen Ober- und Unterseite des Löffelarms mit Verschleißbändern versehen sind, die gegen die Verschleißbänder am Löffelstiel anliegen. Auf diese Weise liegen während des gegenseitigen Verschiebens die Verschleißbänder des Löffelarms und die des Löffelstiels ständig gegeneinander an, so daß, da sie eine wesentlich größere Härte als der Werkstoff des Löffelarms und der des Löffelstiels aufweisen, ein wesentlich geringerer Verschleiß und damit eine erheblich größere Einsatzfähigkeit des Tieflöffels gegeben ist.The object to be achieved with the invention is seen in designing the arm and arm in such a way that they are exposed to even less wear. This object has been achieved according to the invention in that the insides of the top and bottom walls of the arm, which are located on the top and bottom of the arm, are provided with wear bands which bear against the wear bands on the arm. In this way, the wear bands of the spoon arm and those of the dipper arm are constantly in contact with each other during the mutual displacement, so that since they have a much greater hardness than the material of the dipper arm and that of the dipper arm, there is substantially less wear and thus a considerably greater usability of the bucket is given.

Zweckmäßig kann nach einem weiteren Vorschlag der Erfindung mindestens ein Verschleißband, vorzugsweise die des Löffelstiels, lösbar angeordnet sein, wobei sich in einigen Fällen auch eine lösbare Anordnung aller Verschleißbänder empfiehlt.According to a further proposal of the invention, at least one wear band, preferably that of the dipper stick, can expediently be arranged detachably, with a detachable arrangement of all wear bands also being recommended in some cases.

Erfindungsgemäß können im eingefahrenen Zustand des Löffelstiels die Verschleißbänder auf ihrer ganzen Länge gegeneinander anliegen. An dieser Stelle ist natürlich darauf hinzuweisen, daß es nicht unbedingt erforderlich ist, daß der Löffelstiel in den Löffelarm eingefahren wird. Es ist gleichermaßen möglich, daß sich der Löffelstiel auf dem Löffelarm verschiebt, so daß in einem solchen Falle auch die Verschleißbänder entsprechend angebracht werden können.According to the invention, the wear bands can rest against one another over their entire length when the dipper arm is retracted. At this point it should of course be pointed out that it is not absolutely necessary for the dipper stick to be inserted into the dipper arm. It is equally possible that the dipper stick moves on the dipper arm, so that in such a case the wear straps can also be attached accordingly.

In der Zeichnung ist ein nachfolgend näher erläutertes Ausführungsbeispiel der Erfindung dargestellt. Es zeigt:

  • Fig. 1 einen Tieflöffel in perspektivischer Darstellung;
  • Fig. 2 den Löffelarm mit Löffelstiel in Seitenansicht und;
  • Fig. 3 einen Schnitt nach der Linie 3-3 in Fig. 2.
In the drawing, an embodiment of the invention explained in more detail below is shown. It shows:
  • Figure 1 is a bucket in perspective.
  • Figure 2 shows the spoon arm with arm in side view and.
  • 3 shows a section along the line 3-3 in FIG. 2nd

In Fig. 1 der Zeichnung ist ein an einem angedeuteten Fahrzeug angeschlossener Tieflöffel mit 11 bezeichnet, der einen Schwenkteil 13 aufweist, der wiederum über einen Zapfen mit dem Fahrzeug oder einem Ackerschlepperrahmen zur Schwenkbewegung um eine vertikale Achse verbunden ist.In Fig. 1 of the drawing, a bucket connected to an indicated vehicle is designated 11, which has a pivoting part 13, which in turn is connected via a pin to the vehicle or an agricultural tractor frame for pivoting movement about a vertical axis.

Der Ausleger des Tieflöffels ist mit 17 bezeichnet und über herkömmliche Mittel an dem Schwenkteil 13 angeschlossen sowie mit einem Auslegerarm 19 versehen, der einenends starr an dem Schwenkteil 13 angreift. An das andere Ende des Auslegerarms 19 ist ein Löffelarm 21 schwenkbar angeschlossen, wobei eine vertikale Schwenkbewegung über einen hydraulisch beaufschlagbaren Stellzylinder 23 erzeugt werden kann. Letzterer wiederum ist mit einem Ende an dem Auslegerarm 19 angeschlossen, während sein anderes beispielsweise kolbenseitiges Ende an dem Löffelarm 21 angreift, damit der Löffelarm um eine horizontale Achse verstellt werden kann.The boom of the bucket is designated 17 and connected to the swivel part 13 by conventional means and provided with an extension arm 19 which rigidly engages the swivel part 13 at one end. A bucket arm 21 is pivotally connected to the other end of the extension arm 19, wherein a vertical pivoting movement can be generated via a hydraulically actuated actuating cylinder 23. The latter in turn is connected at one end to the cantilever arm 19, while its other end, for example on the piston side, engages the bucket arm 21 so that the bucket arm can be adjusted about a horizontal axis.

Aus den Figuren 1, 2 und 3 ist zu entnehmen, daß der Löffelarm 21 aus einem Gehäuse besteht, daß durch erste und zweite, sich längs erstreckende Teile 31 und 33 gebildet ist, die im wesentlichen einen umgekehrt L-förmigen Querschnitt aufweisen. Die Teile 31 und 33 erstrecken sich mit ihrem langen Schenkel vertikal und sind an ihren unteren Enden durch einen Längsteil 35, der die Unterseite des Löffelarms bildet, miteinander verbunden. Die kurzen Schenkel der im Querschnitt L-teilig ausgebildeten Teile 31 und 33 liegen, wie insbesondere aus Fig. 3 hervorgeht, nicht gegeneinander an und bilden damit zwischen sich einen Schlitz 37. Damit besteht der Löffelarm aus einem an seiner Oberseite geschlitzten hohlprofilartigen Gehäuse mit recht- oder etwa rechteckigem Querschnitt. Die vertikal ausgerichteten Bereiche der Teile 31 und 33 können auch als Seitenwände 31 und 33 und die horizontal ausgerichteten kurzen Schenkel der Teile 31 und 33 als Oberseite 39 bezeichnet werden. Damit bildet der Teil 35 die Unterseite.It can be seen from FIGS. 1, 2 and 3 that the spoon arm 21 consists of a housing which is formed by first and second, longitudinally extending parts 31 and 33 which essentially have an inverted L-shaped cross section. The parts 31 and 33 extend vertically with their long legs and are connected to one another at their lower ends by a longitudinal part 35 which forms the underside of the spoon arm connected. The short legs of the parts 31 and 33, which are of L-shaped cross section, do not lie against one another, as can be seen in particular in FIG. 3, and thus form a slot 37 between them. The spoon arm therefore rightly consists of a hollow profile-like housing slotted on its upper side - or approximately rectangular cross-section. The vertically oriented regions of the parts 31 and 33 can also be referred to as side walls 31 and 33 and the horizontally oriented short legs of the parts 31 and 33 as the upper side 39. Part 35 thus forms the underside.

Um den Löffelarm entsprechend verstärken zu können, ist eine Endversteifung 45 vorgesehen, die sich an dem freien Ende 47 des Löffelarmes 21 befindet. Eine teilweise geschlitzte Rückenplatte 49 ist fest an dem anderen Ende des Löffelarms 21 über herkömmliche Mittel mit der Oberseite 39 verbunden.In order to be able to reinforce the spoon arm accordingly, an end stiffener 45 is provided, which is located at the free end 47 of the spoon arm 21. A partially slotted back plate 49 is fixedly connected to the top 39 at the other end of the spoon arm 21 by conventional means.

Beiderseits des Schlitzes 37 sind auf der Oberseite 39 des Löffelarms 21 Versteifungsschienen 51 vorgesehen.On both sides of the slot 37 21 stiffening rails 51 are provided on the top 39 of the spoon arm.

Ein ein- und ausfahrbarer Löffelstiel ist mit 53 bezeichnet und wird von dem Inneren des Löffelarmes 21 in einer teleskopischen Art und Weise, die nachfolgend noch näher erläutert werden wird, aufgenommen. Im einzelnen besteht der Löffelstiel 53 ebenfalls aus einem Gehäuse aus Hohlprofil mit einer Deckenwand 55 und einer Bodenwand 57 und Seitenteilen 59 und 61. Ein hydraulisch betätigbarer Stellzylinder 63 ist schwenkbar im Inneren des Löffelarmes im Bereich dessen vorderen Endes zwischen den Seitenwänden 31 und 33 über herkömmliche Mittel angebracht. Das andere Ende dieses Stellzylinders 63 greift schwenkbar an dem Löffelstiel 53 über herkömmliche Mittel, die zwischen dessen Seitenteilen vorgesehen sind, an. Über diesen Stellzylinder 63 kann somit der Löffelstiel in den Löffelarm ein- und ausgefahren werden. Ein Löffel 64 ist schwenkbar an das freie Ende des Löffelstiels 53 angeschlossen, wobei zusätzlich noch ein Gestänge 65 vorgesenen ist, über das der Löffel mittels eines weiteren Stellzylinders 67 in seine verschiedenen Betriebsstellungen verstellt werden kann. Zum Anschluß des Stellzylinders 67 dient ein Lager 86, das fest an der Deckenwand 55 des Löffelstiels 53 über herkömmliche Mittel angeschlossen ist und sich von dort durch den Schlitz 37 in der Oberseite 39 von dem Löffelstiel aus nach oben erstreckt und den Stellzylinder schwenkbar aufnimmt. Das andere Ende des Stellzylinders 67 ist an das Gestänge 65 angeschlossen, wobei der Löffel 64 entsprechend betätigt werden kann. Das Zusammenwirken von Löffelarm und Löffelstiel ist relativ ausführlich in dem Dokument US-A-3 140 000 beschrieben, worauf sich hier bezogen wird.An extendable and extendable dipper stick is designated 53 and is received by the interior of the dipper arm 21 in a telescopic manner, which will be explained in more detail below. In particular, the dipper arm 53 also consists of a housing made of a hollow profile with a top wall 55 and a bottom wall 57 and side parts 59 and 61. A hydraulically actuatable actuating cylinder 63 can be pivoted inside the dipper arm in the region of its front end between the side walls 31 and 33 via conventional ones Means attached. The other end of this actuating cylinder 63 pivotally engages the dipper arm 53 via conventional means provided between the side parts thereof. The dipper stick can thus be moved into and out of the dipper arm via this adjusting cylinder 63. A spoon 64 is pivotally connected to the free end of the spoon arm 53, a linkage 65 additionally being provided, by means of which the spoon is extended by means of a wide Ren actuator cylinder 67 can be adjusted in its various operating positions. For the connection of the actuating cylinder 67 is a bearing 86 which is fixedly connected to the ceiling wall 55 of the arm 53 by conventional means and from there extends through the slot 37 in the top 39 from the arm and up and pivots the actuating cylinder. The other end of the actuating cylinder 67 is connected to the linkage 65, and the bucket 64 can be actuated accordingly. The interaction of the dipper arm and dipper arm is described in some detail in document US-A-3 140 000, to which reference is made here.

Um nun insbesondere den erhöhten Verschleiß an dem Löffelarm zu verhindern, sind sich längs erstreckende Verschleißbänder an den Innenseiten des Löffelarmes 21 und an den Außenseiten des Löffelstiels 53 vorgesehen. Diese Verschleißbänder weisen eine wesentlich größere Härte als der Werkstoff des Löffelarmes und des Löffelstiels auf und können beispielsweise aus gehärtetem Stahl mit einer Rockwell C Härte von 42 hergestellt sein. Im einzelnen wie aus Fig. 3 hervorgeht, 2 Verschleißbänder 70 längs des Schlitzes 37 mit der Innenseite der Oberseite 39 des Löffelarmes 21 über herkömmliche Mittel verbunden. Des weiteren sind zwei weitere Verschleißbänder 72 mit der Innenseite der Unterseite 35 den Bändern 70 gegenüberliegend vorgesehen.In order to prevent the increased wear on the bucket arm in particular, longitudinally extending wear bands are provided on the inside of the bucket arm 21 and on the outside of the dipper arm 53. These wear straps have a much greater hardness than the material of the bucket arm and the dipper stick and can be made, for example, of hardened steel with a Rockwell C hardness of 42. In detail, as can be seen from FIG. 3, 2 wear bands 70 are connected along the slot 37 to the inside of the upper side 39 of the spoon arm 21 by conventional means. Furthermore, two further wear bands 72 are provided with the inside of the underside 35 opposite the bands 70.

Ein drittes Paar Verschleißbänder 78 ist lösbar über herkömmliche Mittel an der Außenseite der Bodenwand 57 des Löffelstiels 53 derart angeordnet, daß es den Verschleißbändern 72 gegenüberliegt, wobei alle Verschleißbänder gegeneinander anliegen können. Ein viertes Paar Verschleißbänder 80 ist lösbar, damit es ebenfalls leicht ersetzt werden kann, über herkömmliche Mittel an der Außenseite der Deckenwand 55 des Löffelstiels derart vorgesehen, daß sie auf ihrer gesamten Länge gegen die Verschleißbänder 70 anliegen, wenn der Löffelstiel in den Löffelarm eingefahren worden ist. Jeweils ein fünftes und sechstes Paar Verschleißbänder 74 und 76 ist noch lösbar über herkömmliche Mittel mit den Innenseiten der entsprechenden Seitenteile 59 und 61 des Löffelstiels verbunden und derart angeordnet, daß sie sich gegenüberliegen.A third pair of wear straps 78 is releasably disposed via conventional means on the outside of the bottom wall 57 of the dipper stick 53 in such a way that it lies opposite the wear straps 72, whereby all wear straps can lie against one another. A fourth pair of wear straps 80 is releasable, so that it can also be easily replaced, by conventional means provided on the outside of the top wall 55 of the dipper stick so that they lie against the wear straps 70 over their entire length when the dipper stick has been inserted into the dipper arm is. Fifth and sixth pairs of wear Bands 74 and 76 is still releasably connected by conventional means to the inside of the corresponding side parts 59 and 61 of the dipper arm and arranged such that they are opposite one another.

Da der Löffelstiel 53 verschiebbar in teleskopischer Art und Weise in dem Löffelarm 21 angeordnet ist, besteht bei der Verschiebebewegung ein Gleitkontakt zwischen den Verschleißbändern 70 und 80 sowie zwischen den Verschleißbändern 72 und 78. Über diesen Kontakt wird auch das wesentliche Gewicht des Löffelstiels mit Löffel aufgenommen. Die Verschleißbänder 74 und 75 dagegen brauchen nur gegen die Innenseiten der entsprechenden Seitenwände 31 und 33 des Löffelarmes 21 anzuliegen. Hier kann ein Entlanggleiten an den Wänden ohne Vorhandensein von zusätzlichen Verschleißbändern in Kauf genommen werden, da der kritische Verschleißbereich des Löffelstiels zwischen den Flächen der Verschleißbänder 72 und 78 sowie 70 und 80 auftritt. Durch das Anliegen der Verschleißbänder im kritischen Bereich gegen weitere Verschleißbänder wird im Vergleich zur herkömmlichen Verschleißbandanordnung eine um das fünf- bis zehnfache vergrößerte Einsatzdauer des Tieflöffels erzielt, ohne daß ein Ersatz der Verschleißbänder erforderlich würde. Ein leichtes Ersetzen wird dadurch noch gefördert, daß zumindest die Verschleißbänder 74 bis 80 lösbar angeordnet sind. Bei zunehmendem Verschleiß wird natürlich das Spiel zwischen Löffelstiel und Auslegerarm größer, wobei jedoch bei Ersatz der Verschleißbänder das Spiel wieder auf ein zu tolerierendes Maß zurückgeführt wird, was nicht der Fall ist bei der herkömmlichen Ausführung. Im übrigen ist als weiterer Vorteil anzumerken, daß über die erfindungsgemäße Anordnung der Verschleißbänder das Gesamtgewicht des Tieflöffels bzw. seines Auslegers nicht wesentlich erhöht wird.Since the dipper arm 53 is arranged in a telescopic manner in the dipper arm 21, there is a sliding contact between the wear bands 70 and 80 as well as between the wear bands 72 and 78 during the sliding movement. This contact also absorbs the essential weight of the dipper arm with a spoon . The wear bands 74 and 75, on the other hand, need only lie against the inner sides of the corresponding side walls 31 and 33 of the spoon arm 21. Here, sliding along the walls without the presence of additional wear bands can be accepted, since the critical area of wear of the dipper stick occurs between the surfaces of the wear bands 72 and 78 as well as 70 and 80. Due to the abutment of the wear bands in the critical area against further wear bands, a service life of the bucket that is five to ten times longer than that of the conventional wear band arrangement is achieved without the need to replace the wear bands. Easy replacement is further promoted in that at least the wear bands 74 to 80 are arranged detachably. With increasing wear, of course, the play between the dipper arm and the boom arm increases, but when the wear straps are replaced, the play is reduced to a tolerable level, which is not the case with the conventional design. In addition, it should be noted as a further advantage that the total weight of the bucket or its boom is not significantly increased by the arrangement of the wear straps according to the invention.

Claims (3)

1. Löffelarm, insbesondere für einen Tieflöffel (11), der als Hohlprofil mit recht- oder etwa rechteckigem Querschnitt ausgebildet und in seinem Inneren einen ein- und ausfahrbaren Löffelstiel (53) mit angepaßtem Außenprofil aufnimmt, der eine Decken- (55) und Bodenwand (57) aufweist, wobei die Decken- (55) und die Bodenwand (57) an ihren Außenseiten mit gegenseitigen Abstand aufweisenden Verschleißbändern (78, 80) versehen sind, dadurch gekennzeichnet, daß die Innenseiten der der Decken- (55) und Bodenwand (57) des Löffelstiels (53) zugelegenen Ober- und Unterseite (39, 35) des Löffelarms (21) mit Verschleißbändern (70, 72) versehen sind, die gegen die Verschleißbänder (78, 80) am Löffelstiel (53) anliegen.1. bucket arm, in particular for a backhoe bucket (11), which is designed as a hollow profile with a rectangular or approximately rectangular cross-section and in its interior houses a retractable and extendable dipper arm (53) with an adapted outer profile, which has a ceiling (55) and bottom wall (57), the top (55) and the bottom wall (57) being provided on their outer sides with mutually spaced wear bands (78, 80), characterized in that the inner sides of the top (55) and bottom walls ( 57) of the dipper arm (53), the top and bottom sides (39, 35) of the dipper arm (21) are provided with wear bands (70, 72) which bear against the wear bands (78, 80) on the dipper arm (53). 2. Löffelarm nach Anspruch 1, dadurch gekennzeichnet, daß mindestens ein Verschleißband (70, 72, 78, 80), vorzugsweise die des Löffelstiels (53), lösbar angeordnet sind.2. Bucket arm according to claim 1, characterized in that at least one wear band (70, 72, 78, 80), preferably that of the dipper arm (53), are detachably arranged. 3. Löffelarm nach Anspruch 1, dadurch gekennzeichnet, daß im eingefahrenen Zustand des Löffelstiels (53) die Verschleißbänder (70, 72, 78, 80) auf ihrer ganzen Länge gegeneinander anliegen.3. Bucket arm according to claim 1, characterized in that in the retracted state of the dipper stick (53) the wear bands (70, 72, 78, 80) rest against each other over their entire length.
EP86106281A 1985-05-20 1986-05-07 Dipper stick, in particular for a bucket excavator Withdrawn EP0202545A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73590385A 1985-05-20 1985-05-20
US735903 1985-05-20

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EP0202545A1 true EP0202545A1 (en) 1986-11-26

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EP86106281A Withdrawn EP0202545A1 (en) 1985-05-20 1986-05-07 Dipper stick, in particular for a bucket excavator

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EP (1) EP0202545A1 (en)
JP (1) JPS61266739A (en)
AU (1) AU5681386A (en)
BR (1) BR8602215A (en)
ES (2) ES8703561A1 (en)
FI (1) FI862063A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395305A2 (en) * 1989-04-26 1990-10-31 Japanic Corporation Excavator
EP0794148A2 (en) * 1996-03-04 1997-09-10 Kidde Industries, Inc. A device for guiding a telescopic part for a telescopic boom
US6036429A (en) * 1995-06-06 2000-03-14 Cbw Automation, Inc. High speed article retrieval system
DE102006004207A1 (en) * 2006-01-30 2007-08-09 Lanz Baumaschinen Gmbh Arm e.g. base arm for excavator e.g. mini excavator, has main part and two side pieces are connected with main part where each of two side parts has fastening element, with which arm is connected with excavator
CN105133679A (en) * 2015-08-03 2015-12-09 广西大学 Bucket rod telescopic excavating mechanism capable of expanding excavation depth through control of crank sliding block

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107989619A (en) * 2017-12-20 2018-05-04 佛山科学技术学院 A kind of telescopic shoveling arm of tunnelling

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240986A (en) * 1970-02-05 1971-07-28 Ware Machine Works Inc Improvements to dipperstick assemblies
US3688930A (en) * 1971-04-05 1972-09-05 John F Shumaker Extensible dipper stick for backhoe
US3690742A (en) * 1971-11-19 1972-09-12 Grove Mfg Co Crane boom
EP0115941A1 (en) * 1983-01-26 1984-08-15 M.D.S. Furnace Services Limited Furnace delining apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1240986A (en) * 1970-02-05 1971-07-28 Ware Machine Works Inc Improvements to dipperstick assemblies
US3688930A (en) * 1971-04-05 1972-09-05 John F Shumaker Extensible dipper stick for backhoe
US3690742A (en) * 1971-11-19 1972-09-12 Grove Mfg Co Crane boom
EP0115941A1 (en) * 1983-01-26 1984-08-15 M.D.S. Furnace Services Limited Furnace delining apparatus

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0395305A2 (en) * 1989-04-26 1990-10-31 Japanic Corporation Excavator
EP0395305A3 (en) * 1989-04-26 1992-01-22 Japanic Corporation Excavator
US6036429A (en) * 1995-06-06 2000-03-14 Cbw Automation, Inc. High speed article retrieval system
US6227352B1 (en) * 1995-06-06 2001-05-08 Cbw Automation, Inc. High speed article retrieval system
EP0794148A2 (en) * 1996-03-04 1997-09-10 Kidde Industries, Inc. A device for guiding a telescopic part for a telescopic boom
EP0794148A3 (en) * 1996-03-04 1999-02-10 Kidde Industries, Inc. A device for guiding a telescopic part for a telescopic boom
DE102006004207A1 (en) * 2006-01-30 2007-08-09 Lanz Baumaschinen Gmbh Arm e.g. base arm for excavator e.g. mini excavator, has main part and two side pieces are connected with main part where each of two side parts has fastening element, with which arm is connected with excavator
DE102006004207B4 (en) * 2006-01-30 2015-02-12 Lanz Baumaschinen Gmbh Forked boom for an excavator
CN105133679A (en) * 2015-08-03 2015-12-09 广西大学 Bucket rod telescopic excavating mechanism capable of expanding excavation depth through control of crank sliding block

Also Published As

Publication number Publication date
JPS61266739A (en) 1986-11-26
BR8602215A (en) 1987-01-13
AU5681386A (en) 1986-11-27
FI862063A0 (en) 1986-05-16
ES555085A0 (en) 1987-02-16
ES8703561A1 (en) 1987-02-16
FI862063A (en) 1986-11-21
ES2068787A6 (en) 1995-04-16

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