EP0035541A1 - Grappin de conduite - Google Patents

Grappin de conduite

Info

Publication number
EP0035541A1
EP0035541A1 EP19800901799 EP80901799A EP0035541A1 EP 0035541 A1 EP0035541 A1 EP 0035541A1 EP 19800901799 EP19800901799 EP 19800901799 EP 80901799 A EP80901799 A EP 80901799A EP 0035541 A1 EP0035541 A1 EP 0035541A1
Authority
EP
European Patent Office
Prior art keywords
gripping
jaw
jaws
pivot axis
axis
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Withdrawn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
EP19800901799
Other languages
German (de)
English (en)
Inventor
Josef Emunds
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DE19792936990 external-priority patent/DE2936990A1/de
Priority claimed from DE19803014146 external-priority patent/DE3014146A1/de
Application filed by Individual filed Critical Individual
Publication of EP0035541A1 publication Critical patent/EP0035541A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
    • B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
    • B66C1/42—Gripping members engaging only the external or internal surfaces of the articles
    • B66C1/422—Gripping members engaging only the external or internal surfaces of the articles actuated by lifting force

Definitions

  • the invention relates to a gripping device for pipes with two scissor-like crossing arms that are pivotally hinged about an axis, at the free ends of which two parallel to the pivot axis of the gripping arms. Gripping rails are attached, each having at least two spaced-apart gripping jaws that grip the pipes to be lifted laterally, which are provided with the frictional or positive locking between the pipe to be lifted and the gripping jaws reinforcing gripping elements.
  • Gripping devices of this type are known from DE-GM 74 11 330.
  • the gripping jaws are rigidly attached to the gripping rails and the surfaces of the gripping jaws, which bear against the pipe wall when a pipe is lifted, are provided with gripping elements which are provided with a gripping device for concrete pipes are designed as steel tips and in a gripping device for steel pipes, clay pipes and other pipes that have a smooth surface, as elastic supports.
  • the object of the present invention is to provide a gripping device for pipes, the gripping jaws of which reliably grip the pipes to be received.
  • This object is achieved in that the gripping jaws pivotable about axes running parallel to the pivot axis of the gripping arms on the gripping rails and are held by a lower stop in a position approximately corresponding to the gripping position and each gripping jaw extends parallel to the pivot axis over the gripping jaws
  • the pivotably mounted gripping jaws lie against the tube wall in such a way that the two mutually parallel gripping regions of the gripping jaws are loaded essentially at the same level.
  • each gripping area has at least one row more pointed
  • the steel teeth can be formed by tapered, wear-resistant bolts which are inserted into recesses in a steel chuck which is easily detachably attached to the gripping jaw.
  • the steel teeth reliably grip concrete pipes even if, for example, they are contaminated with clay, bitumen or the like.
  • each gripping area is formed by a rubber-elastic strip.
  • the spring which presses the gripping jaw into the gripping position, in which the lower gripping area protrudes further inward towards the pipe to be accommodated than the upper gripping area when unloaded, has to absorb large loads with relatively small spring travel.
  • Another object of the invention is to design the suspension of the gripping jaws so that it is reliable, takes up little space and has a strongly increasing spring stiffness under load.
  • the back of the gripping jaw is curved around at least one axis running parallel to the pivot axis, the distance from a parallel to its abutment surface is greater than the distance of the pivot axis from this abutment surface and that between the curved back of the gripping plate and the abutment surface is arranged a strand-like, rubber-elastic, pre-stressed body.
  • the elastic body presses the gripper jaw into the gripping position. If the gripping device is brought over a pipe to be picked up and the gripping arms close, then the gripping area located below the pivot axis of the gripping jaw first lies against the pipe wall. The gripping jaw is pivoted so far against the action of the resilient body that also its upper gripping area bears against the pipe wall. By swiveling the gripping jaw when receiving a tube, the curved back of the gripping jaw presses against the. strand-shaped rubber-elastic body and at the same time takes it into the narrowing gap between the curved back of the gripping jaw and the bearing surface. This compression of the rubber-elastic body increases its rigidity. In a preferred embodiment, the
  • Invention consists of the gripping rail from a U-profile, in which the gripping jaws are mounted so that the abutment surface is formed from the inside of the web of the U-profile and the strand-shaped rubber-elastic body is at an angle of the U-profile when the gripping jaw is not loaded.
  • a downwardly projecting stop on the gripping jaw which serves as a resilient deflector and makes it easier to reach over the gripping device.
  • the stop on the gripping jaws has the task of putting the pipe gripper over a pipe to be picked up without difficulty and thereby protecting the gripping elements, in particular the metallic gripping tips, against abrasion.
  • FIG. 1 shows a side view of the gripping device
  • FIG. 2 shows a top view of a gripping rail of a gripping arm of the gripping device
  • FIG. 3 shows a view along the section line III-III in FIG. 2
  • Fig. 4 is a view along the section line IV-IV in Fig. 3
  • Fig. 5 is a plan view of a jaw
  • the two parallel gripping elements are elastic strips
  • Fig. 6 is a view along the section line
  • FIG. 7 is a plan view of the gripping jaw shown in FIG. 5
  • FIG. 8 is a side view of a pipe gripper
  • FIG. 9 is a plan view of a gripping rail of the pipe gripper according to FIG. 8
  • FIG. 10 is a view according to the section line XX in Fig. 9, Fig. 11 is a plan view of a gripping jaw
  • FIG. 12 is a view of a Grelfbacke according to Fig. 10 with an elastic insert for gripping smooth tubes.
  • the gripping device for pipes shown in FIGS. 1 and 8 has two gripping arms 1 and 2 which intersect like scissors and which are pivoted to one another about the axis 3. At the upper ends of the gripper arms 1 and 2, tabs 4 and 5 are articulated, which are connected in an articulated manner to an eyelet 6. The eyelet 6 is used to hang the gripping device on a rope or chain sling.
  • a tension spring (not shown) is arranged on the one hand and on the other hand a locking device 7 which holds the two gripper arms 1 and 2 in the open position after a tube has been removed, until the gripping device with the adjustable stop 8 is placed on a new pipe to be picked up.
  • Gripping rails 9 and 10 are arranged, which run parallel to the pivot axis 3.
  • the gripping rails 9 and 10 are formed by U-profiles.
  • a gripping jaw 11 is arranged, which is fastened pivotably by a relatively small angle about an axis 12 running parallel to the pivot axis 3 of the gripping arms 1 and 2.
  • the gripping jaws 11 are held by lower stops 13 in a position corresponding approximately to the gripping position. In this position, the mutually facing surfaces of the opposing gripping jaws diverge from bottom to top.
  • 1,2 and 4 are resilient at the ends of the gripping rails 9 and 10
  • Deflector 16 arranged, which ensure that the gripping device can be easily brought over a tube.
  • the deflector 16 consists of a sheet steel strip, the upper end of which is fastened to the gripping rail 9 or 10 substantially parallel to the plane of the gripping jaws 11 and the lower end of which is fastened to the gripping rail at right angles thereto.
  • the resilient deflection bar has the effect that the gripping device slides over a pipe without difficulty, although when the gripping device is lowered the two gripping rails are not aligned parallel to the pipe to be received.
  • the resilient deflection brackets 16 striking the pipe to be accommodated automatically bring the two parallel gripping rails 9 and 10 into a position in which they run parallel to the axis of the pipe to be accommodated.
  • the deflectors also prevent the gripping elements on the gripping jaws from being excessively worn or the gripping elements damaging the surface of the pipe to be received.
  • the locking device 7 unlocks, so that the gripping arms can be closed and the gripping jaws 11 lie below the pipe center on the pipe wall.
  • the resilient deflection brackets 16 are elastically deformed to such an extent that the two gripping elements 14 and 15 of each gripping jaw lie against the surface of the pipe to be received unhindered.
  • the gripping jaws 11 are in the gripping areas 14 and 15 with pointed steel teeth
  • the steel teeth 17 are formed by tapered bolts made of wear-resistant material which are inserted into recesses in a steel chuck 18 which is easily detachably fastened on the gripping jaw 11.
  • the tapered bolts are made from round material and are inserted into bores in the steel chuck 18. The bolts can be in the recesses of the
  • Steel lining 18 can be pressed in and soldered or welded to the steel lining. However, it is also possible to insert the bolts into the steel chuck 18 such that they can be easily replaced by the gripping jaw 11 after the steel chuck 18 has been loosened. In this case, the bolts are provided with a head or a collar at the back, which presses against the steel lining from the inside
  • This embodiment has the advantage that the bolts made of high quality material can be easily replaced when worn.
  • the steel chuck 18 is screwed onto the gripping jaw 11 via a centrally arranged screw 19.
  • Shear sleeves 20, which slide into corresponding bores in the steel chuck 18, serve to absorb the shear forces acting in the fastening plane and the gripping jaw 11 are inserted.
  • the gripping jaw 11 is pressed by a spring 25 against the upper stop 24 of the gripping jaw 11.
  • the spring 25 is formed by a rubber block. Characterized in that the spring 25 presses the gripping jaw 11 against the upper stop 24, the lower gripping region 14 is pivoted more inwards in the relieved state than in the loaded state. This has the consequence that when the gripping device is closed, the gripping jaws 11 first come into contact with the wall of the tube to be picked up with the lower gripping regions 14 and only then with the upper gripping regions 15. This ensures that each pivotable gripping jaw 11 has both gripping regions 14 ⁇ nd 15 come to rest on the pipe wall.
  • the exemplary embodiment according to FIGS. 5, 6 and 7 shows a claw or a gripping jaw 11 with which the gripping device is equipped when it grips pipes with a smooth surface.
  • the lower and upper gripping areas 14 and 15 are each formed by a rubber-elastic bar 21.
  • the elastic 3 bar 21 is vulcanized onto a steel bar 22 and the steel bar 22 is fastened to the gripping jaw 11 in an easily detachable manner by means of a screw 26.
  • the surfaces of the two elastic strips 21 one Gripping jaws 11 are flat and inclined so that they enclose an angle of 160 ° to 175 °. In this way it is achieved that both elastic strips 21 lie flat against the curved tube wall despite their flat surface.
  • the clamping jaws 11 are pivotally mounted in walls 27 which are welded into the gripping rails 9 and 10 at right angles to the pivot axis 3 of the gripping jaws 1 and 2.
  • the free edges of the flanges 28 and 29 of the gripping rails 9 and 10 formed from a U-profile serve as lower stops 13 and upper stops 24 of the gripping jaws 11.
  • protruding stops 116 alg deflectors are arranged on the gripping jaws 11 downward.
  • the outwardly resilient stop 116 has the effect that the gripping device slides over a tube without difficulty, although b, when the gripping device is lowered, the two gripping rails are not aligned parallel to the tube to be received.
  • the stops 116 abutting the pipe to be accommodated automatically bring the two parallel gripping rails 9 and 10 into a position in which they run parallel to the axis of the pipe to be accommodated.
  • the stops 116 also prevent the gripping teeth of the gripping jaws from being excessively worn.
  • the gripping jaws 11 are pivotally mounted in walls 27 which are welded into the gripping rails 9, 10.
  • the free edges of the flanges of the gripping rails 9, 10 formed from a U-profile serve as lower stops 13 and upper stops 24 of the gripping jaws 11.
  • Fig. 10 shows a view along the section line XX in Fig. 9, at. but with the gripper jaw 11 their gripping areas 14, 15 abut against the wall 30 of a pipe to be received, which is shown in dot-dash lines, and the gripping jaw 11 is pivoted somewhat downward.
  • the gripping jaw 11 is under the action of a rubber-elastic, resilient, strand-like body 125, which is arranged between an abutment surface 31 and the curved rear side 32 of the gripping jaw 11 and extends over the width of the gripping jaw 11.
  • the radius of curvature of the curvature of the rear side 32 is approximately twice as large as the distance between the pivot axis 12 and the abutment surface 31.
  • the starting position of the gripping jaw 11 and the rubber-elastic body 125 is also shown in broken lines. In this unloaded position, the gripping jaw 11 is pressed by the resilient body 125 against the upper stop 24.
  • the elastic body 125 is carried along by the curved rear side 32 of the gripping jaw 11 and squeezed into the narrowing gap between the rear side 32 and the abutment surface 31.
  • the gripping jaws 11 of the pipe gripper are equipped with these inserts 37 when pipes with a smooth surface are to be gripped.
  • the insert 37 has an essentially flat lower gripping area 14 and an upper gripping area 15, which lies against the pipe wall.
  • the planes of these gripping areas 14 and 15 are at an angle of, for example, 170 ° or 180 ° to one another.
  • the semi-cylindrical recess 36 is arranged in such a way that the tooth tips of the gripping teeth 17 are created with its help.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Load-Engaging Elements For Cranes (AREA)

Abstract

Dans un grappin de conduite comprenant deux bras (1, 2) articules sur un axe (3) a la maniere de ciseaux, deux rails de prehension (9, 10) paralleles a l'axe (3) sont fixes aux extremites libres des bras (1, 2). Chaque rail comporte au moins deux machoires (11) qui prennent la conduite par dessous (11) et qui sont munies d'elements de prehension pour augmenter le pouvoir de prehension au moyen d'une forme speciale ou d'une friction accrue. Pour pouvoir prendre et tenir la conduite de facon sure, les machoires (11) sont fixees aux rails (2, 10) de facon a pivoter autour d'axes (12) paralleles a l'axe (3) des bras (1, 2). Les machoires (11) sont maintenues dans une position de prehension approximative par une butee inferieure (13). De plus, chaque machoire (11) est munie de deux elements de prehension (14, 15) disposes parallelement a l'axe (3) sur des machoires (11) et se plaquant contre la paroi de la conduite. L'un des elements de prehension (14, 15) est situe en-dessous de l'axe de pivotement (12) de la machoire (11) et l'autre en-dessus.
EP19800901799 1979-09-13 1981-03-23 Grappin de conduite Withdrawn EP0035541A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE19792936990 DE2936990A1 (de) 1979-09-13 1979-09-13 Greifvorrichtung fuer rohre
DE2936990 1979-09-13
DE19803014146 DE3014146A1 (de) 1980-04-12 1980-04-12 Greifvorrichtung fuer rohre
DE3014146 1980-04-12

Publications (1)

Publication Number Publication Date
EP0035541A1 true EP0035541A1 (fr) 1981-09-16

Family

ID=25781001

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800901799 Withdrawn EP0035541A1 (fr) 1979-09-13 1981-03-23 Grappin de conduite

Country Status (2)

Country Link
EP (1) EP0035541A1 (fr)
WO (1) WO1981000705A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1211602B (it) * 1987-12-15 1989-11-03 Prima Ind Spa Dispositivo manipolatore robotizzato particolarmente per lamiere avente organi di presa automatica mente intercambiabili
ES2393107B1 (es) * 2010-05-26 2013-10-23 Rubrica Ingeniería Y Arquitectura S.L. Pinza de manipulación y transporte.

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2927704A (en) * 1960-03-08 Hydraulic device
DE699266C (de) * 1938-02-22 1940-11-26 Fried Krupp Grusonwerk Akt Ges Zange zum Foerdern von Bloecken
US2337177A (en) * 1942-10-08 1943-12-21 Breslav Jack Lifting grab
US2497600A (en) * 1945-05-21 1950-02-14 William M Grigsby Hoist device
US2915332A (en) * 1956-07-03 1959-12-01 Cleveland Crane Eng Material handling apparatus
DE1117280B (de) * 1959-02-05 1961-11-16 Peter Moskopf Vielfachgreifer zum Stapeln, Arken und Verladen von Deckensteinen, Platten od. dgl.
US3099476A (en) * 1961-05-29 1963-07-30 Garrett H Miller Stone grapple
BE717934A (fr) * 1968-07-11 1968-12-16
DE1937281A1 (de) * 1969-07-23 1971-02-04 Hermann Steinweg Kg Baumaschin Einseitig wirkender Krangreifer fuer Steinpakete des Bauwesens
CH605389A5 (fr) * 1977-05-17 1978-09-29 Kueng Hans
DE2722689C2 (de) * 1977-05-18 1983-02-03 Alfred Ing.(grad.) 8160 Miesbach Kinshofer Auf eine Greifzange unrüstbarer Zweischalengreifer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8100705A1 *

Also Published As

Publication number Publication date
WO1981000705A1 (fr) 1981-03-19

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

Designated state(s): AT CH FR GB NL

STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19810923