EP0490271A1 - Strain relief device of traction-loaded servomotors for lifting arms - Google Patents

Strain relief device of traction-loaded servomotors for lifting arms Download PDF

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Publication number
EP0490271A1
EP0490271A1 EP91120889A EP91120889A EP0490271A1 EP 0490271 A1 EP0490271 A1 EP 0490271A1 EP 91120889 A EP91120889 A EP 91120889A EP 91120889 A EP91120889 A EP 91120889A EP 0490271 A1 EP0490271 A1 EP 0490271A1
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EP
European Patent Office
Prior art keywords
tension member
servomotor
servomotors
loaded
intermediate piece
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.)
Withdrawn
Application number
EP91120889A
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German (de)
French (fr)
Inventor
Horst Dipl.-Ing. Kolleth
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.)
Krupp Industietechnik GmbH
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Krupp Industietechnik GmbH
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Filing date
Publication date
Application filed by Krupp Industietechnik GmbH filed Critical Krupp Industietechnik GmbH
Publication of EP0490271A1 publication Critical patent/EP0490271A1/en
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02F—DREDGING; SOIL-SHIFTING
    • E02F9/00—Component parts of dredgers or soil-shifting machines, not restricted to one of the kinds covered by groups E02F3/00 - E02F7/00
    • E02F9/24—Safety devices, e.g. for preventing overload
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49721—Repairing with disassembling
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49718—Repairing
    • Y10T29/49721—Repairing with disassembling
    • Y10T29/4973—Replacing of defective part

Definitions

  • the invention relates to a device for relieving tensile actuators for the height adjustment of cantilevers, in particular cantilevers of surface mining equipment, wherein the actuating motor (s) can be connected in parallel with at least one tension member.
  • Jibs of devices such as surface mining equipment, cranes and similar conveying devices are often equipped with actuators, particularly hydraulic cylinders, which are subject to tensile loads for height adjustment. If - e.g. in the event of a defect - such an actuator must be replaced, the problem arises that, before the actuator can be relieved of its tensile stress, the boom must be fixed in its position. This is possible and customary through a stacked scaffold that supports the boom or the heavier counterweight boom against the formation. Such a process is time-consuming and material-intensive and also unsafe.
  • an additional guying system which consists of attaching a traction cable parallel to the servomotor, which absorbs the tensile forces after the servomotor has been relieved. So that the cylinder is not damaged, the rope must be arranged at a sufficient distance from the latter, the fastening of which is generally difficult because special and sufficiently stable attachment means, for example eyelets, are not available or cannot be attached. In addition, must the rope must also be equipped with suitable slings and have a certain length.
  • the invention has for its object to provide a device with which relief of the servomotor can be achieved in a very short time with simultaneous safe replacement guying.
  • the object is achieved in a device of the type mentioned in that the tension member is articulated at one end to an intermediate piece provided with three articulation points arranged in a triangle, which is releasably connected to another of its articulation points with the servomotor.
  • the invention has the advantage that the new intermediate piece is a simple, inexpensive part that remains arranged on the device and therefore does not have to be removed. Only a single additional attachment point for the tension member is required, which can be arranged in the immediate vicinity of the articulation point of the adjustment motor, so that an additional support structure is not required.
  • a tie rod that is easier to handle than a rope is preferably used as the tension member. This can also be put into a "parking position", e.g. can be folded easily.
  • the new device is suitable for all devices provided with a height-adjustable boom, but preferably for corresponding surface mining devices, such as bucket wheel excavators, bucket wheel loaders, spreaders or the like. provided, and in particular for such devices in which the boom and the counterweight boom are connected to each other via a rocker bracing.
  • a c-shaped device upper part 2 is pivotally mounted about a vertical axis.
  • the upper part 2 carries a paddle wheel boom 3 articulated on it for height adjustment, which is connected via tie rods 4 to a triangular rocker 5, which consists of an approximately vertical strut 6 and an approximately horizontal strut 7, the ends of which are connected to one another via tie rods 8 .
  • the rocker 5 is pivotally articulated on the upper part 2 of the upper part 2 via a horizontal axis 9 and carries a counterweight 10 at the free end.
  • a hydraulic cylinder 13 and an intermediate piece 14 are arranged as a servomotor.
  • the intermediate piece 14 has articulation points 15, 16 and 17, the piston rod of the hydraulic cylinder 13 being connected to the articulation point 15 and the articulation point 17 being arranged at the node 11. Since the counterweight boom formed by the rocker 5 and the counterweight 10 has a greater weight than the bucket wheel boom 3 and the hydraulic cylinder 13 is only subjected to tension, the eye bearing 12 is located opposite the rocker axis 9 on the side of the bucket wheel boom 3. Between the Eye bearing 12 and the axis 9 is attached to the top of the upper part 2 close to the eye bearing, a stop point 18.
  • an intermediate piece 14 ' is used in which the distance between its upper hinge point 17' on the one hand and the two lower hinge points 15 and 16 on the other hand is shorter than in the case of the intermediate piece 14 according to the previous embodiment, so that the intermediate piece 14 'Not articulated directly to the node 11, but connected to it via a tie rod 21.
  • a pull rod 22 is used as the tension member, which can again be attached to the attachment point 18 and the articulation point 16 of the intermediate piece 14 '. Removal and installation of the hydraulic cylinder 13 using the tie rod 22 is carried out in the same way as in the previous embodiment with the rope 19 as a tension member.
  • the pull rod 22 need not be removed if it e.g. is folded around the stop point 18 into a snap-in arrangement 23 arranged on the upper part 2 of the device, as indicated by a chain line in FIG. 2.

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Jib Cranes (AREA)

Abstract

The invention relates to a strain-relief device for tension-loaded servomotors for the vertical adjustment of booms (3), in particular booms of open-cast mining machines, in which device at least one tension member can be connected in parallel with the servomotor or servomotors. The aim is to relieve the servomotor, which is preferably a hydraulic cylinder (13), in the shortest time - e.g. for dismantling it - which is achieved by the tension member (tie rod 22) being linked (articulation point 16) with one end to an intermediate piece (14') which is provided with three articulation points arranged in a triangle and is detachably connected with another of its articulation points (15) to the servomotor. <IMAGE>

Description

Die Erfindung bezieht sich auf eine Vorrichtung zur Entlastung von zugbeanspruchten Stellmotoren für die Höhenverstellung von Auslegern, insbesondere Ausleger von Tagebaugeräten, wobei dem bzw. den Stellmotor(en) mindestens ein Zugglied parallelschaltbar ist.The invention relates to a device for relieving tensile actuators for the height adjustment of cantilevers, in particular cantilevers of surface mining equipment, wherein the actuating motor (s) can be connected in parallel with at least one tension member.

Ausleger von Geräten, wie Tagebaugeräten, Kranen und ähnlichen Fördergeräten, werden für die Höhenverstellung vielfach mit zugbeanspruchten Stellmotoren, insbesondere Hydraulikzylinder, versehen. Wenn - z.B. im Falle eines Defekts - ein solcher Stellmotor ausgetauscht werden muß, ergibt sich das Problem, daß, bevor der Stellmotor von seiner Zugbeanspruchung entlastet werden kann, der Ausleger in seiner Lage fixiert werden muß. Dies ist möglich und üblich durch ein untergestapeltes Gerüst, welches den Ausleger bzw. den schwereren Gegengewichtsausleger gegen das Planum abstützt. Ein solches Verfahren ist zeit- und materialaufwendig und außerdem unsicher.Jibs of devices such as surface mining equipment, cranes and similar conveying devices are often equipped with actuators, particularly hydraulic cylinders, which are subject to tensile loads for height adjustment. If - e.g. in the event of a defect - such an actuator must be replaced, the problem arises that, before the actuator can be relieved of its tensile stress, the boom must be fixed in its position. This is possible and customary through a stacked scaffold that supports the boom or the heavier counterweight boom against the formation. Such a process is time-consuming and material-intensive and also unsafe.

Anstelle einer solchen Unterstapelung ist daher bereits eine zusätzliche Abspannung angewandt worden, die darin besteht, ein Zugseil parallel zu dem Stellmotor anzuschlagen, welches nach dem Entlasten des Stellmotors die Zugkräfte aufnimmt. Damit der Zylinder nicht beschädigt wird, muß das Seil mit ausreichendem Abstand von letzterem angeordnet werden, wobei dessen Befestigung in der Regel Schwierigkeiten bereitet, da besondere und ausreichend stabile Anschlagmittel, z.B. Auglaschen, nicht vorhanden oder nicht anbringbar sind. Außerdem muß das Seil ebenfalls mit geeigneten Anschlagmitteln versehen sein und eine bestimmte Länge haben.Instead of such under-stacking, an additional guying system has therefore already been used, which consists of attaching a traction cable parallel to the servomotor, which absorbs the tensile forces after the servomotor has been relieved. So that the cylinder is not damaged, the rope must be arranged at a sufficient distance from the latter, the fastening of which is generally difficult because special and sufficiently stable attachment means, for example eyelets, are not available or cannot be attached. In addition, must the rope must also be equipped with suitable slings and have a certain length.

Der Erfindung liegt die Aufgabe zugrunde, eine Vorrichtung zu schaffen, mit welcher in kürzester Zeit eine Entlastung des Stellmotors bei gleichzeitiger sicherer Ersatzabspannung erzielbar ist.The invention has for its object to provide a device with which relief of the servomotor can be achieved in a very short time with simultaneous safe replacement guying.

Die Aufgabe wird bei einer Vorrichtung der eingangs genannten Art dadurch gelöst, daß das Zugglied mit einem Ende an einem mit drei im Dreieck angeordneten Gelenkpunkten versehenen Zwischenstück angelenkt ist, welches mit einem weiteren seiner Gelenkpunkte mit dem Stellmotor lösbar verbunden ist. Die Erfindung bringt den Vorteil, daß das neue Zwischenstück ein einfaches, kostengünstig herzustellendes Teil darstellt, welches am Gerät angeordnet bleibt und ein Entfernen somit entfällt. Es ist lediglich ein einziger zusätzlicher Anschlagpunkt für das Zugglied erforderlich, welcher in unmittelbarer Nähe des Anlenkpunktes des Verstellmotors angeordnet werden kann, so daß eine zusätzliche Stützkonstruktion entfällt.The object is achieved in a device of the type mentioned in that the tension member is articulated at one end to an intermediate piece provided with three articulation points arranged in a triangle, which is releasably connected to another of its articulation points with the servomotor. The invention has the advantage that the new intermediate piece is a simple, inexpensive part that remains arranged on the device and therefore does not have to be removed. Only a single additional attachment point for the tension member is required, which can be arranged in the immediate vicinity of the articulation point of the adjustment motor, so that an additional support structure is not required.

Als Zugglied wird bevorzugt eine besser als ein Seil handhabbare Zugstange eingesetzt. Diese kann auch außerhalb ihres Einsatzes in eine "Parkstellung" gebracht, z.B. auf einfache Weise geklappt werden.A tie rod that is easier to handle than a rope is preferably used as the tension member. This can also be put into a "parking position", e.g. can be folded easily.

Die neue Vorrichtung ist für alle mit einem höhenverstellbaren Ausleger versehenen Geräte geeignet, bevorzugt jedoch für entsprechende Tagebaugeräte, wie Schaufelradbagger, Schaufelradlader, Absetzer o.dgl. vorgesehen, und dabei insbesondere für solche Geräte, bei denen der Ausleger und der Gegengewichtsausleger über eine Wippenabspannung miteinander verbunden sind.The new device is suitable for all devices provided with a height-adjustable boom, but preferably for corresponding surface mining devices, such as bucket wheel excavators, bucket wheel loaders, spreaders or the like. provided, and in particular for such devices in which the boom and the counterweight boom are connected to each other via a rocker bracing.

In der Zeichnung sind zwei Ausführungsbeispiele der Erfindung dargestellt und nachfolgend näher erläutert.In the drawing, two embodiments of the invention are shown and explained in more detail below.

Die Fig. 1 und 2 zeigen jeweils einen Schaufelradbagger schematisch und in Ansicht, auf dessen fahrbarem Untergestell 1 ein c-förmiges Geräte-Oberteil 2 um eine senkrechte Achse schwenkbar gelagert ist. Das Oberteil 2 trägt einen an ihm zur Höhenverstellung angelenkten Schaufelrad-Ausleger 3, der über Zugstangen 4 mit einer dreieckförmigen Wippe 5 verbunden ist, die aus einer etwa senkrechten Strebe 6 und einer etwa waagerechten Strebe 7 besteht, deren Enden über Zugstangen 8 miteinander verbunden sind. Die Wippe 5 ist im oberen Bereich des Oberteils 2 an diesem über eine horizontale Achse 9 schwenkbar angelenkt und trägt am freien Ende ein Gegengewicht 10.1 and 2 each show a bucket wheel excavator schematically and in view, on the mobile base frame 1, a c-shaped device upper part 2 is pivotally mounted about a vertical axis. The upper part 2 carries a paddle wheel boom 3 articulated on it for height adjustment, which is connected via tie rods 4 to a triangular rocker 5, which consists of an approximately vertical strut 6 and an approximately horizontal strut 7, the ends of which are connected to one another via tie rods 8 . The rocker 5 is pivotally articulated on the upper part 2 of the upper part 2 via a horizontal axis 9 and carries a counterweight 10 at the free end.

Zwischen einem Knotenpunkt 11, der am oberen Ende der Strebe 6 angeordnet ist und die Zugstangen 4 und 8 miteinander verbindet, und einem an der Oberseite des Oberteils 2 befindlichen Auglager 12 ist als Stellmotor ein Hydraulikzylinder 13 sowie ein Zwischenstück 14 angeordnet. Das Zwischenstück 14 weist Gelenkpunkte 15, 16 und 17 auf, wobei die Kolbenstange des Hydraulikzylinders 13 mit dem Gelenkpunkt 15 verbunden und der Gelenkpunkt 17 an dem Knotenpunkt 11 angeordnet ist. Da der durch die Wippe 5 und das Gegengewicht 10 gebildete Gegengewichtsausleger ein größeres Gewicht als der Schaufelradausleger 3 aufweist und der Hydraulikzylinder 13 nur auf Zug beansprucht wird, befindet sich das Auglager 12 gegenüber der Wippen-Achse 9 an der Seite des Schaufelradauslegers 3. Zwischen dem Auglager 12 und der Achse 9 ist dicht neben dem Auglager ein Anschlagpunkt 18 an der Oberseite des Oberteils 2 befestigt.Between a node 11, which is arranged at the upper end of the strut 6 and connects the tie rods 4 and 8 to one another, and an eye bearing 12 located on the upper side of the upper part 2, a hydraulic cylinder 13 and an intermediate piece 14 are arranged as a servomotor. The intermediate piece 14 has articulation points 15, 16 and 17, the piston rod of the hydraulic cylinder 13 being connected to the articulation point 15 and the articulation point 17 being arranged at the node 11. Since the counterweight boom formed by the rocker 5 and the counterweight 10 has a greater weight than the bucket wheel boom 3 and the hydraulic cylinder 13 is only subjected to tension, the eye bearing 12 is located opposite the rocker axis 9 on the side of the bucket wheel boom 3. Between the Eye bearing 12 and the axis 9 is attached to the top of the upper part 2 close to the eye bearing, a stop point 18.

Zur Vorbereitung des Ausbaues des Hydraulikzylinders 13 wird beim Ausführungsbeispiel nach Fig. 1 ein an beiden Enden jeweils mit einem Anschlagmittel versehenes Seil 19 am Anschlagpunkt 18 und am Gelenkpunkt 16 des Zwischenstücks 14 angeschlagen. Daraufhin wird die Kolbenstange des Hydraulikzylinders 13 so weit ausgefahren, bis letzterer völlig entlastet ist, was in dem Augenblick der Fall ist, wo das Seil 19 die volle Last übernommen hat. Je nach Anordnung der Gelenkpunkte des Zwischenstücks sowie des Anlenkpunkts 18 und des Auglagers 12 schwenkt das Zwischenstück 14 bei der Lastübernahme durch das Seil 19 um den Gelenkpunkt 17 in Richtung des Schaufelrad-Auslegers 3. Der unbelastete Hydraulikzylinder 13 kann nunmehr ohne weiteres, z.B. mittels eines Krans, ausgebaut werden. Einer Unterstapelung des Gegengewichts 10, z.B. durch ein Gerüst 20 - wie in Fig. 1 angedeutet - bedarf es nicht. Der Einbau des Hydraulikzylinders 13 vollzieht sich in umgekehrter Reihenfolge; sobald er die Last wieder übernommen hat, kann das Seil 19 als Ersatz-Zugglied auf einfache Weise wieder entfernt werden.To prepare for the expansion of the hydraulic cylinder 13 in the embodiment according to FIG. 1, a rope 19 provided at both ends with a sling means at the sling point 18 and at the hinge point 16 of the Intermediate piece 14 struck. Then the piston rod of the hydraulic cylinder 13 is extended until the latter is completely relieved, which is the case at the moment when the rope 19 has taken over the full load. Depending on the arrangement of the articulation points of the intermediate piece and the articulation point 18 and the eye bearing 12, the intermediate piece 14 swivels around the articulation point 17 in the direction of the bucket wheel boom 3 when the load is taken over by the cable 19 Crane to be removed. A counter-stacking of the counterweight 10, for example by a scaffold 20 - as indicated in Fig. 1 - is not required. The installation of the hydraulic cylinder 13 takes place in the reverse order; as soon as he has taken over the load again, the rope 19 can easily be removed as a replacement tension member.

Beim Ausführungsbeispiel nach Fig. 2 ist ein Zwischenstück 14' verwendet, bei dem der Abstand zwischen seinem oberen Gelenkpunkt 17' einerseits und den beiden unteren Gelenkpunkten 15 und 16 andererseits kürzer ist als bei dem Zwischenstück 14 nach dem vorhergehenden Ausführungsbeispiel, so daß das Zwischenstück 14' nicht direkt an dem Knotenpunkt 11 angelenkt, sondern mit diesem über eine Zugstange 21 verbunden ist. Als Zugglied kommt eine Zugstange 22 zum Einsatz, welche wieder an dem Anschlagpunkt 18 und dem Gelenkpunkt 16 des Zwischenstücks 14' anschlagbar ist. Ausbau und Einbau des Hydraulikzylinders 13 unter Einsatz der Zugstange 22 erfolgt in gleicher Weise wie beim vorhergehenden Ausführungsbeispiel mit dem Seil 19 als Zugglied. Die Zugstange 22 braucht nicht entfernt zu werden, wenn sie z.B. um den Anschlagpunkt 18 in eine an dem Geräteoberteil 2 angeordnete Einrastung 23 geklappt wird, wie durch eine Strichpunktlinie in Fig. 2 angedeutet.2, an intermediate piece 14 'is used in which the distance between its upper hinge point 17' on the one hand and the two lower hinge points 15 and 16 on the other hand is shorter than in the case of the intermediate piece 14 according to the previous embodiment, so that the intermediate piece 14 'Not articulated directly to the node 11, but connected to it via a tie rod 21. A pull rod 22 is used as the tension member, which can again be attached to the attachment point 18 and the articulation point 16 of the intermediate piece 14 '. Removal and installation of the hydraulic cylinder 13 using the tie rod 22 is carried out in the same way as in the previous embodiment with the rope 19 as a tension member. The pull rod 22 need not be removed if it e.g. is folded around the stop point 18 into a snap-in arrangement 23 arranged on the upper part 2 of the device, as indicated by a chain line in FIG. 2.

Claims (4)

Vorrichtung zur Entlastung von zugbeanspruchten Stellmotoren für die Höhenverstellung von Auslegern, insbesondere Ausleger von Tagebaugeräten, wobei dem (den) Stellmotor(en) mindestens ein Zugglied parallelschaltbar ist, dadurch gekennzeichnet, daß das Zugglied mit einem Ende an einem mit drei im Dreieck angeordneten Gelenkpunkten versehenen Zwischenstück (14, 14') angelenkt ist (Gelenkpunkt 16), welches mit einem weiteren seiner Gelenkpunkte (15) mit dem Stellmotor lösbar verbunden ist.Device for relieving tensile actuators for the height adjustment of brackets, in particular brackets of surface mining equipment, wherein the actuator (s) at least one tension member can be connected in parallel, characterized in that the tension member is provided at one end with three articulation points arranged in a triangle Intermediate piece (14, 14 ') is articulated (articulation point 16), which is detachably connected to the servomotor with another of its articulation points (15). Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß das Zugglied eine an dem Geräteteil, an dem der Stellmotor angreift, angelenkte Zugstange (22) ist.Apparatus according to claim 1, characterized in that the tension member is a tie rod (22) articulated on the device part to which the servomotor acts. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß der (die) Stellmotor(en) (ein) Hydraulikzylinder (13) ist (sind).Device according to claim 1 or 2, characterized in that the servo motor (s) is (are) a hydraulic cylinder (13). Verwendung der Vorrichtung nach einem der vorhergehenden Ansprüche für ein mit einem Schaufelrad- und einem Gegengewichtsausleger, die über eine Wippenabspannung miteinander verbunden sind, versehenes Tagebaugerät.Use of the device according to one of the preceding claims for a surface mining device provided with a paddle wheel and a counterweight boom, which are connected to one another via a rocker bracing.
EP91120889A 1990-12-14 1991-12-05 Strain relief device of traction-loaded servomotors for lifting arms Withdrawn EP0490271A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4039973 1990-12-14
DE4039973A DE4039973C2 (en) 1990-12-14 1990-12-14 Device for relieving tensile actuators for the height adjustment of booms

Publications (1)

Publication Number Publication Date
EP0490271A1 true EP0490271A1 (en) 1992-06-17

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EP91120889A Withdrawn EP0490271A1 (en) 1990-12-14 1991-12-05 Strain relief device of traction-loaded servomotors for lifting arms

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US (1) US5192180A (en)
EP (1) EP0490271A1 (en)
CN (1) CN1062398A (en)
AU (1) AU643346B2 (en)
CA (1) CA2056571A1 (en)
DE (1) DE4039973C2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2765550B1 (en) * 1997-07-07 1999-10-01 Eurocopter France DEVICE FOR PITCHING THE BLADES OF A MAIN ROTOR OF A GIRAVION
US9587377B2 (en) * 2015-02-06 2017-03-07 Harnischfeger Technologies, Inc. Raised counterweight for a mining machine
JP7101634B2 (en) * 2019-03-29 2022-07-15 本田技研工業株式会社 Resin molded product

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173549A (en) * 1962-03-22 1965-03-16 Emil A Bender Material handling device
US3982648A (en) * 1975-11-10 1976-09-28 International Harvester Company Lift arm safety bar

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1906569A1 (en) * 1969-02-10 1970-08-27 Marker Hannes Safety toe piece for ski bindings
US3931956A (en) * 1973-06-25 1976-01-13 Hawkins Wallace H Hoist
US4004696A (en) * 1975-10-17 1977-01-25 Dravo Corporation Material handling apparatus with load compensated counterweight system
JPS60169352U (en) * 1984-04-18 1985-11-09 株式会社　竹内製作所 drilling equipment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3173549A (en) * 1962-03-22 1965-03-16 Emil A Bender Material handling device
US3982648A (en) * 1975-11-10 1976-09-28 International Harvester Company Lift arm safety bar

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Publication number Publication date
CA2056571A1 (en) 1992-06-15
US5192180A (en) 1993-03-09
AU8971491A (en) 1992-06-18
CN1062398A (en) 1992-07-01
AU643346B2 (en) 1993-11-11
DE4039973A1 (en) 1992-06-17
DE4039973C2 (en) 1994-04-14

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