EP0044335A1 - Connection rod between the hoisting hook and the elevator of a drill rod - Google Patents

Connection rod between the hoisting hook and the elevator of a drill rod

Info

Publication number
EP0044335A1
EP0044335A1 EP19810900449 EP81900449A EP0044335A1 EP 0044335 A1 EP0044335 A1 EP 0044335A1 EP 19810900449 EP19810900449 EP 19810900449 EP 81900449 A EP81900449 A EP 81900449A EP 0044335 A1 EP0044335 A1 EP 0044335A1
Authority
EP
European Patent Office
Prior art keywords
elevator
connection
connecting rods
rods
rod
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Withdrawn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
EP19810900449
Other languages
German (de)
French (fr)
Inventor
Jürgen ULBRICH
Horst Poppe
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.)
Blohm and Voss GmbH
Original Assignee
Blohm and Voss GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Blohm and Voss GmbH filed Critical Blohm and Voss GmbH
Publication of EP0044335A1 publication Critical patent/EP0044335A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B19/00—Handling rods, casings, tubes or the like outside the borehole, e.g. in the derrick; Apparatus for feeding the rods or cables
    • E21B19/02—Rod or cable suspensions
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G15/00—Chain couplings, Shackles; Chain joints; Chain links; Chain bushes
    • F16G15/08—Swivels

Definitions

  • the invention relates to connecting rods between the load hook and the elevator of a drill pipe with eyes provided at each end of the rod.
  • Such connecting rods are used in pairs on the load hooks in drilling towers for suspending the "elevators” as so-called “elevator brackets”.
  • the connecting rods are subject to severe wear, which mainly occurs in the eye area. This damage can be remedied by grinding out and build-up welding and tempering the connecting rods again, however a reduction in lifting capacity may be unavoidable. If there are major signs of wear, the connecting rods must be scrapped for safety reasons.
  • the previously known connecting rods are made in one piece in a cast or Sch deie construction or from a combination of both manufacturing processes
  • the invention has for its object to reduce the amount of connecting rods to be stored as spare parts.
  • the couplings can be designed using joints, threads, clamps, bolts, brackets, etc.
  • the stock of the reserve rods can additionally be reduced if the load hook eye is also interchangeably attached to the shaft. Worn load hook and elevator eyes are then easily exchangeable.
  • the connecting rods By dividing the connecting rods into several parts, different materials can be used. For example, the cast iron or the eyes and the shaft is made of rolled material. This will reduce! the manufacturing cost. If the hook eye is not to be coupled to the shaft, a welded connection is also conceivable.
  • damping devices can be provided in the connecting rods via, for example, Fer hydraulics, which enable a reduction in the shock effect when the load is taken up, as a result of which it is conceivable to use inexpensive, ie undamped load hook types.
  • Fer hydraulics which enable a reduction in the shock effect when the load is taken up, as a result of which it is conceivable to use inexpensive, ie undamped load hook types.
  • FIG. 1 shows an elevator 5 of a drill rod, also not shown, suspended on the load hook 4 of a hoist (not shown) with the aid of connecting rods 3.
  • Each of the connecting rods 3 consists of two flat iron strips 6, which are detachably connected to the upper hook eye 1 and the lower elevator eye 2 by means of a bolt, screw or plug connection 16.
  • Fig. 2 shows between the load hook 4 and the elevator 5 i
  • Attachment to the eyes 1 'and 2' consists of a bolt, screw or plug connection 17.
  • 3 shows connecting rods 3 "in rod shape 9.
  • the detachable connection with eyes 1" and 2 " is shown using the example of the elevator eye 2" in FIGS. 3a to 3e and the example of the lifting hook eye 1 "in FIG. 3f.
  • Fig. 3c shows two cuts perpendicular to each other through a two-part, e.g. screws 12 (not shown) held in holes 11a of the flanges 11 coupling 12 Rectangular or round heads of the parts 2 "and 3" detachable and, if necessary, non-rotatably connected
  • 3d shows a detachable connection of the parts 2 "and 3" produced by flat overlaps 13 by means of screws 13a.
  • Fig. 3e shows a similar overlap '14 as shown in FIG. 3d, but with a shear surface 15 for relief of the bolt 14a in tension.
  • __c: 3f shows a connection of the parts 1 "and 3" by welding. This connection is released by a flame or saw cut along line 18 and the connection is restored by welding the machined cut surfaces of parts 1 "and 3" again.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Lift-Guide Devices, And Elevator Ropes And Cables (AREA)

Abstract

Entre le crochet de levage (4) et l'elevateur (5) d'un dispositif de levage d'une tige de forage sont interposees des tringles de liaison (3) presentant au moins des anneaux interchangeables (2) d'accrochage de l'elevateur. La liaison (16) entre les tringles et les anneaux de l'elevateur peut etre formee d'une liaison a cheville, a vis ou d'un accouplement a fiches. Dans ce cas les tringles de liaison (3) peuvent etre constituees chacune de deux barres de fer (6) ou d'un tuyau (7). On peut egalement utiliser des tiges (9) comme tringles, la liaison avec les anneaux d'accrochage de l'elevateur pouvant alors etre realisee a l'aide de coussinets, de brides, par chevauchement ou vissage. L'anneau d'accrochage (1) au crochet de levage peut aussi etre fixe aux tringles (3) de maniere amovible. De cette maniere il est possible d'echanger aisement les anneaux uses de l'elevateur et eventuellement aussi les anneaux d'accrochage au crochet de levage.Between the lifting hook (4) and the elevator (5) of a device for lifting a drill pipe are interposed connecting rods (3) having at least interchangeable rings (2) for attaching the 'elevator. The connection (16) between the rods and the elevator rings can be formed by a plug connection, a screw connection or a plug coupling. In this case the connecting rods (3) can each be made up of two iron bars (6) or a pipe (7). One can also use rods (9) as rods, the connection with the latching rings of the elevator can then be achieved using bearings, flanges, by overlapping or screwing. The lifting ring (1) for the lifting hook can also be fixed to the rods (3) in a removable manner. In this way it is possible to easily exchange the used rings of the lift and possibly also the rings for hooking to the lifting hook.

Description

• Verbindunqsstangen zwischen dem Lasthaken • connecting rods between the load hook
und dem Elevator eines Bohrgestänges.and the elevator of a drill pipe.
Die Erfindungs betrifft Verbindungsstangen zwischen dem Lasthaken und dem Elevator eines Bohrgestänges mit an jedem Stangenende vorgesehenen Augen. Solche Verbindungsstangen werden an den Lasthaken in Bohr¬ türmen zur Aufhängung der " Elevatoren " als soge¬ nannte " Elevatoren-Bügel " paarweise verwendet.The invention relates to connecting rods between the load hook and the elevator of a drill pipe with eyes provided at each end of the rod. Such connecting rods are used in pairs on the load hooks in drilling towers for suspending the "elevators" as so-called "elevator brackets".
Je nach dem Einsatzgebiet und der Art der verschie¬ denen Bohrungen oder bei anderweitigen Arbeitsgängen ändern sich jedoch die Durchmesser sowie die Aus¬ führungen der Bohrgestänge. Deshalb werden verschiedene Elevatoren benötigt, während der Lasthaken unverändert bleibt. Bedingt durch diesen Umstand, werden z.Zt., passend zu dem jeweiligen Elevator Verbindungsstangen mit verschiedenen Abmessungen der unteren Elevator- Augen verwendet, während das obere Lasthaken-Auge immer dasselbe ist. D.h. lediglich das in den Elevator eingehängte Elevator-Auge sowie der Durchmesser des Elevator-Bügelschaftes ändern sich im Hinblick auf die zum Einsatz kommenden Elevatoren bzw. deren Hebe¬ kapazität sowie die gewünschte Distanz zwischen Last¬ haken und Elevator. Dieses führt zu einer aufwendigen Ersatzteil-Lagerung, weil zu einer Bohrausrüstung mehrere VerbindungsStange gehören.Depending on the area of use and the type of different bores or in other work steps, however, the diameters and the designs of the drill rods change. Therefore different elevators are needed, while the load hook remains unchanged. Due to this circumstance, connecting rods with different dimensions of the lower elevator eyes are currently used, suitable for the respective elevator, while the upper hook eye is always the same. That is to say, only the elevator eye suspended in the elevator and the diameter of the elevator bracket shaft change with regard to the elevators used or their lifting capacity and the desired distance between the load hook and the elevator. This leads to expensive spare parts storage, because several connecting rods belong to one drilling equipment.
Andererseits unterliegen die VerbindungsStangen einem starken Verschleiß, der hauptsächlich im tragenden Be¬ reich der Augen auftritt. Diese Beschädigungen können durch Ausschleifen und Auftragsschweißen und erneutes Vergüten der VerbindungsStangen behoben werden, wodurc jedoch eine Minderung der Hubkapazität unter Umständen unvermeidbar ist. Bei größeren Verschleißerscheinungen müssen die Verbindungsstangen aus Sicherheitsgründen verschrottet werden.On the other hand, the connecting rods are subject to severe wear, which mainly occurs in the eye area. This damage can be remedied by grinding out and build-up welding and tempering the connecting rods again, however a reduction in lifting capacity may be unavoidable. If there are major signs of wear, the connecting rods must be scrapped for safety reasons.
Die bisher bekannten VerbindungsStangen werden aus ein Stück in einer Guß- oder Sch deiekonstruktion oder aus einer Kombination beider Herstellungsverfahren gefertiThe previously known connecting rods are made in one piece in a cast or Sch deie construction or from a combination of both manufacturing processes
Geläufige Längenabmessungen von Verbindungsstangen mit gleichen Lasthakenaugen und den dazugehörigen Elevator Augenabmessungen von z.B.21/4" und 2 3/4" sind :Common length dimensions of connecting rods with the same hook eyes and the corresponding elevator eye dimensions of e.g. 21/4 "and 2 3/4" are:
2 1/4" x 72" und 2 3/4" x 72" -2 1/4 "x 72" and 2 3/4 "x 72" -
2 1/4" x 84" und 2 3/4" x 84"2 1/4 "x 84" and 2 3/4 "x 84"
2 1/4" x 96" und 2 3/4" x 96"2 1/4 "x 96" and 2 3/4 "x 96"
2 1/4" x lo8" und 2 3/4" x lo8"2 1/4 "x lo8" and 2 3/4 "x lo8"
2 1/4" x 132" und 2 3/4" x 132" Der Erfindung liegt die Aufgabe zugrunde, die Menge der als Ersatzteile einzulagernden Verbindungsstangen zu reduzieren.2 1/4 "x 132" and 2 3/4 "x 132" The invention has for its object to reduce the amount of connecting rods to be stored as spare parts.
Die Lösung dieser Aufgabe besteht darin, daß wenigstens das Elevator-Auge an der Ver indungsstange austauschbar befestigt ist.The solution to this problem is that at least the elevator eye is interchangeably attached to the connecting rod.
D.h. das Lasthaken-Auge sowie der Stangenschaft werden entsprechend der max. Tragkraft und den Dimensionen des Hakens gefertigt. Kuppelbar hieran werden verschiedene Elevator-Augen, passend zu den unterschiedlichen Ele¬ vatoren, befestigt. Die Ausführung der Kupplungen kann wahlweise durch Gelenke, Gewinde, Klammern, Bolzen, Laschen usw. erfolgen.That the load hook eye and the rod shaft are adjusted according to the max. Load capacity and the dimensions of the hook. Different elevator eyes, suitable for the different levers, can be attached to this. The couplings can be designed using joints, threads, clamps, bolts, brackets, etc.
Der Bestand der Reserve-Stangen kann zusätzlich redu¬ ziert werden, wenn das Lasthaken-Auge ebenfalls aus¬ wechselbar an den Schaft angebracht wird. Verschlissene Lasthaken- und Elevatoraugen sind dann leicht austausch¬ bar.The stock of the reserve rods can additionally be reduced if the load hook eye is also interchangeably attached to the shaft. Worn load hook and elevator eyes are then easily exchangeable.
Durch die Unterteilung der Verbindungsstangen in mehrere Teile ist der Einsatz von verschiedenen Materialien möglich. Z.B. Können das oder die Augen aus Stahlguß und der Schaft aus gewalztem Material sein. Hierdurch reduziere! sich die Herstellungskosten. Soll das Last¬ hakenauge nicht an den Schaft angekuppelt werden, ist auch eine Schweißverbindung denkbar.By dividing the connecting rods into several parts, different materials can be used. For example, the cast iron or the eyes and the shaft is made of rolled material. This will reduce! the manufacturing cost. If the hook eye is not to be coupled to the shaft, a welded connection is also conceivable.
Bei VerbindungsStangen mit verschiedenen Längen und gleichen Lasthaken-Augenabmessungen sind gemäß der Erfindung nur noch folgende Ersatzteile einzulagern :With connecting rods with different lengths and the same hook eye dimensions, only the following spare parts need to be stored according to the invention:
1 Hakenauge1 hook eye
1 Elevatoräuge 2 1/4" und 1 Auge 2 3/4"1 elevator eye 2 1/4 "and 1 eye 2 3/4"
Je 1 Schaft von 72", 84", 96", lo8" und 132".1 shaft each of 72 ", 84", 96 ", lo8" and 132 ".
Konstruktive Einzelheiten sind in den Unteransprüchen beschrieben.Structural details are described in the subclaims.
Denkbar wäre aber auch die Ausführung mit nur einem Schaft für alle Längen. Hierzu müßten die Augen und de Schaft nach dem Prinzip der Spannschraube ausgeführt werden.It would also be conceivable to use only one shaft for all lengths. To do this, the eyes and the shaft would have to be designed according to the principle of the clamping screw.
Zusätzlich können Dämpfungsvorrichtungen über z.B. Fer Hydraulik in den VerbindungsStangen vorgesehen werden, die eine Reduktion der Schockwirkung bei der Lastauf¬ nahme ermöglichen, wodurch der Einsatz billiger, d.h. ungedämpfter Lasthakentypen denkbar ist. Nachstehend wird die Erfindung anhand von einzelnen in der Zeichnung dargestellten Beispielen näher be¬ schrieben.In addition, damping devices can be provided in the connecting rods via, for example, Fer hydraulics, which enable a reduction in the shock effect when the load is taken up, as a result of which it is conceivable to use inexpensive, ie undamped load hook types. The invention is described in more detail below with reference to individual examples shown in the drawing.
Es zeigen :Show it :
Fig. 1 bis 3 verschiedene Konstruktionen der Verbindungsstangen gemäß der Er¬ findung und1 to 3 different constructions of the connecting rods according to the invention and
Fig.3a bis 3f Einzelheiten der Befestigung der Augen an den Verbindungsstangen gemäß Fig. 3.3a to 3f details of the attachment of the eyes to the connecting rods according to FIG. 3rd
Fig. 1 zeigt einen an dem Lasthaken 4 eines nicht dar¬ gestellten Hebezuges mit Hilfe von Verbindungsstangen 3 aufgehängten Elevator 5 eines ebenfalls nicht ge¬ zeichneten Bohrgestänges. Jede der Verbindungsstangen 3 besteht aus zwei Flach eisenstreifen 6, die mittels einer Bolzen-, Schraub- oder Steck-Verbindung 16 lös¬ bar mit dem oberen Hakenauge 1 und dem unteren Elevator¬ auge 2 verbunden sind.1 shows an elevator 5 of a drill rod, also not shown, suspended on the load hook 4 of a hoist (not shown) with the aid of connecting rods 3. Each of the connecting rods 3 consists of two flat iron strips 6, which are detachably connected to the upper hook eye 1 and the lower elevator eye 2 by means of a bolt, screw or plug connection 16.
Fig. 2 zeigt zwischen dem Lasthaken 4 und dem Elevator 5 iFig. 2 shows between the load hook 4 and the elevator 5 i
Verbindungsstangen 3 in Form von Rohren 7, deren lösbareConnecting rods 3 in the form of tubes 7, the releasable
Befestigung an den Augen l'und 2' aus einer Bolzen-, Schraub- oder Steck-Verbindung 17 besteht. Fig. 3 zeigt Verbindungsstangen 3" in Stabform 9. Die lösbare Verbindung mit den Augen 1" und 2" ist an dem Beispiel des Elevatorauges 2" in Fig. 3a bis 3e und an dem Beispiel des Lasthakenauges 1" in Fig. 3f dargestellt.Attachment to the eyes 1 'and 2' consists of a bolt, screw or plug connection 17. 3 shows connecting rods 3 "in rod shape 9. The detachable connection with eyes 1" and 2 "is shown using the example of the elevator eye 2" in FIGS. 3a to 3e and the example of the lifting hook eye 1 "in FIG. 3f.
In den Fig. 3a und 3b bedeutet 8 eine Muffe und lo einen Stecker, Bolzen oder eine Schraube in konzen¬ trisch ineinandergreifenden Teilen 2" und 3".3a and 3b, 8 means a sleeve and lo a plug, bolt or screw in concentrically interlocking parts 2 "and 3".
Fig. 3c zeigt zwei zueinander rechtwinklig verlaufende Schnitte durch eine zweiteilige, z.B. von Schrauben ( nicht gezeichnet ) in Löchern 11a der Flanschen 11 zusammengehaltene Kupplung 12, die die im Querschnitt z.B. rechteckigen oder runden Köpfe der Teile 2" und 3" lösbar und gegebenenfalls drehfest miteinander verbindeFig. 3c shows two cuts perpendicular to each other through a two-part, e.g. screws 12 (not shown) held in holes 11a of the flanges 11 coupling 12 Rectangular or round heads of the parts 2 "and 3" detachable and, if necessary, non-rotatably connected
Fig.3d zeigt eine durch flache Überlappungen 13 mittel Schrauben 13a hergestellte lösbare Verbindung der Teile 2" und 3".3d shows a detachable connection of the parts 2 "and 3" produced by flat overlaps 13 by means of screws 13a.
Fig. 3e zeigt eine ähnliche Überlappung' 14 wie Fig. 3d, jedoch mit einer Scherfläche 15 zur Entlastung der Schraubenbolzen 14a bei Zugbeanspruchung.Fig. 3e shows a similar overlap '14 as shown in FIG. 3d, but with a shear surface 15 for relief of the bolt 14a in tension.
__c : Die Fig. 3f zeigt eine Verbindung der Teile 1" und 3" durch Schweißung. Die Lösung dieser Verbindung erfolgt durch einen Brenn- oder Säge-Schnitt längs der Linie 18 und die Verbindung wird wieder hergestellt durch erneutes Schweißen der bearbeiteten Schnitt¬ flächen der Teile 1" und 3". __c: 3f shows a connection of the parts 1 "and 3" by welding. This connection is released by a flame or saw cut along line 18 and the connection is restored by welding the machined cut surfaces of parts 1 "and 3" again.

Claims

P A T E N T A N S P R Ü C H E PATENT CLAIMS
1. Verbindungsstangen zwischen dem Lasthaken und dem Elevator eines Bohrgestänges mit an jedem Stangen¬ ende vorgesehenen Augen, dadurch gekennzeichnet, daß wenigstens das Elevator-Auge (2) an der Stange (3) austauschbar befestigt ist.1. connecting rods between the load hook and the elevator of a drill pipe with eyes provided at each rod end, characterized in that at least the elevator eye (2) on the rod (3) is fastened interchangeably.
2. Verbindungsstangen nach Anspruch 1, dadurch gekenn¬ zeichnet, daß jedes Auge (1,2) mittels einer Niet-, Steck- oder SchraubVerbindung an der Stange (3) be¬ festigt ist.2. connecting rods according to claim 1, characterized gekenn¬ characterized in that each eye (1,2) by means of a rivet, plug or screw connection to the rod (3) is fastened.
3. Verbindungsstangen nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß jede der Stangen (3) von zwei Flacheisenstreifen (6) oder von einem Rohr (7) gebildet wird und die Verbindung mit den Augen (1,2) die Form einer Bolzen-, Schraub- oder Steckverbindung (16,17) hat.3. connecting rods according to claims 1 or 2, characterized in that each of the rods (3) by two flat iron strips (6) or by a tube (7) is formed and the connection with the eyes (1,2) the shape of a bolt -, screw or plug connection (16, 17).
4. Verbindungsstangen nach den Ansprüchen 1 oder 2, dadurch gekennzeichnet, daß jede der Stangen (3") Stabform (9) hat und die Verbindung mit den Augen (1,2) mittels Buchsen, Flanschen, Überlappungen oder Verschraubungen erfolgt. 4. connecting rods according to claims 1 or 2, characterized in that each of the rods (3 ") has a rod shape (9) and the connection with the eyes (1,2) by means of bushings, flanges, overlaps or screw connections.
EP19810900449 1980-01-23 1981-01-23 Connection rod between the hoisting hook and the elevator of a drill rod Withdrawn EP0044335A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19803002314 DE3002314A1 (en) 1980-01-23 1980-01-23 CONNECTING RODS BETWEEN THE LOAD HOOK AND THE ELEVATOR OF A DRILL ROD
DE3002314 1980-01-23

Publications (1)

Publication Number Publication Date
EP0044335A1 true EP0044335A1 (en) 1982-01-27

Family

ID=6092750

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19810900449 Withdrawn EP0044335A1 (en) 1980-01-23 1981-01-23 Connection rod between the hoisting hook and the elevator of a drill rod

Country Status (4)

Country Link
EP (1) EP0044335A1 (en)
JP (1) JPS57500159A (en)
DE (1) DE3002314A1 (en)
WO (1) WO1981002182A1 (en)

Families Citing this family (5)

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Publication number Priority date Publication date Assignee Title
DE79846T1 (en) * 1981-11-13 1983-12-08 Hughes Tool Co., 77023 Houston, Tex. MULTI-PIECE CONNECTING ROD FOR AN ELEVATOR.
US6520709B1 (en) * 1999-04-30 2003-02-18 Frank's Casing Crew And Rental Tools, Inc. Variable length/capacity elevator links
DE102008050581A1 (en) * 2008-09-26 2010-04-01 Blohm + Voss Repair Gmbh Method for producing connecting elements and connecting element
CN104632105B (en) * 2015-02-02 2017-03-08 中国石油天然气集团公司 Connect drilling tool operation technique method and instrument
AU2019258608A1 (en) 2018-04-27 2020-11-26 Noetic Technologies Inc. Adjustable bail extension

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Publication number Priority date Publication date Assignee Title
US2067700A (en) * 1936-09-08 1937-01-12 Skelly Oil Co Sucker rod adjuster
GB544267A (en) * 1941-02-06 1942-04-03 North British Electric Welding Improvements in and relating to shackles
US3351372A (en) * 1966-05-02 1967-11-07 Dresser Ind Split hook hoisting apparatus
US3461666A (en) * 1967-10-17 1969-08-19 Byron Jackson Inc Elevator link and process of making the same
GB1325524A (en) * 1971-01-22 1973-08-01 Parsons Chain Co Ltd Chains and other lifting gear

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8102182A1 *

Also Published As

Publication number Publication date
DE3002314A1 (en) 1981-07-30
WO1981002182A1 (en) 1981-08-06
JPS57500159A (en) 1982-01-28

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Inventor name: ULBRICH, JUERGEN