EP1447522A1 - Rohrzange - Google Patents

Rohrzange Download PDF

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Publication number
EP1447522A1
EP1447522A1 EP03003379A EP03003379A EP1447522A1 EP 1447522 A1 EP1447522 A1 EP 1447522A1 EP 03003379 A EP03003379 A EP 03003379A EP 03003379 A EP03003379 A EP 03003379A EP 1447522 A1 EP1447522 A1 EP 1447522A1
Authority
EP
European Patent Office
Prior art keywords
jaw
tongs
jaws
arms
pipe pressing
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Withdrawn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
EP03003379A
Other languages
English (en)
French (fr)
Inventor
Giorgio Vezzani
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.)
Cbc SpA
Original Assignee
Cbc SpA
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 Cbc SpA filed Critical Cbc SpA
Priority to EP03003379A priority Critical patent/EP1447522A1/de
Publication of EP1447522A1 publication Critical patent/EP1447522A1/de
Withdrawn legal-status Critical Current

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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
    • E21B19/16—Connecting or disconnecting pipe couplings or joints
    • E21B19/161—Connecting or disconnecting pipe couplings or joints using a wrench or a spinner adapted to engage a circular section of pipe

Definitions

  • the present invention relates to pipe pressing tongs, i.e. those tongs which, usually operated by a suitable operating device (normally of hydraulic type), enable two pipe pieces to be joined together by a tubular connector with interposed O-rings, the connector then being suitably pressed with the tongs to form the joint.
  • a suitable operating device normally of hydraulic type
  • conventional pipe pressing tongs present two coplanar, symmetrical hinged arms, one end of which is shaped as a jaw.
  • Each jaw has an angular extension of 180 degrees, so as to embrace one half of the tube.
  • Each of the two arms can rotate about its own hinging axis, the two axes being perpendicular to the plane of the two arms and spaced apart.
  • the hinge pins of the two arms are carried by a pair of equal and symmetrical parallel plates, each disposed on one side of the two arms.
  • the two jaws are maintained open by a return spring. To effect the pressfitting operation on a connector, the two jaws are forced together, against the action of the return spring, by widening apart those ends of said arms distant from their jaw-shaped end. This widening is achieved by the aforesaid operating device.
  • the joints obtained in the aforedescribed manner are increasingly used in hydraulic heating and sanitary installations because of their quickness of execution and low cost.
  • pipe pressing tongs comprising three equal jaws, each extending through an angle of 120 degrees.
  • the three jaws are disposed one following the other and connected together by cylindrical hinges.
  • the ends of the three-jaw combination are drawn together (to effect the pressing operation) by two hinged arms similar to the arms of the two-jaw tongs. Consequently, in three-jaw tongs of this type, when in their working position the third jaw (or intermediate jaw) is further from the arm hinge pins than the other two jaws.
  • the intermediate or third jaw does not exert on the connector a force comparable to that exerted by the other two jaws, so that the O-ring of the obtained joint is again not subjected to a radial pressure circumferentially distributed in a sufficiently uniform manner.
  • An object of the present invention is to provide pipe pressing tongs which enable joints to be obtained in the pipes of an installation such that the joint O-ring is subjected to a radial pressure which is circumferentially substantially uniform, so ensuing a perfect joint seal.
  • Another object of the invention is therefore to provide tongs of the aforesaid type which are as simple to use as the known two-jaw tongs.
  • the pipe pressing tongs of the present invention comprising two symmetrical hinged arms each having one end shaped as a jaw extending through an angle of about 120 degrees, the two jaws being closed by widening-apart the other ends of the hinged arms, a third jaw with an angular extension such as to complete the round angle being interposed between the first two jaws, characterised in that the third jaw is closer to the hinge pins of the two arms of the tongs than the first two jaws, means being provided to forcibly advance the third jaw from a retracted position to a position in which it blends with the first two jaws following closure of the tongs.
  • the pipe pressing tongs of the present invention are not only as easy to use as the known two-jaw pipe pressing tongs, but also enable a joint to be obtained in which the O-ring operates circumferentially in a substantially uniform manner, so ensuring the seal.
  • the said means for forcibly advancing the third jaw preferably comprise: a cam surface provided on each of the two hinged arms of the tongs, the two cam surfaces being disposed symmetrically about the tongs axis; and two symmetrical cam follower surfaces provided on the third jaw, each cam follower surface cooperating with one of the cam surfaces to effect the forced advancement of the third jaw.
  • Guide and limit stop means are provided for the third jaw.
  • means are provided to ensure the symmetrical synchronous movement of the two first jaws relative to the third jaw, without involving the operator.
  • the pipe pressing tongs 10 comprise two symmetrical hinged arms 12 and 14 which when at rest are maintained in the position shown in Figure 2 by the action of a helical spring 15.
  • the two arms 12 and 14 are hinged to a pair of symmetrically disposed, parallel equal plates 16 of roughly T-shape.
  • the two arms 12 and 14 are hinged by relative pins 41 fixed to the plates 16 by threaded bushes 38.
  • the axes of the pins 42 are indicated by 28 and 30.
  • the pins 42 are inserted into corresponding through holes (not visible) provided in the plates 16.
  • Both the plates 16 also present a through hole 18 which enables the pressing tongs 10 to be applied to a suitable conventional operating device (not shown), for example of the hydraulic transmission type such as that described in EP 1121997 or EP 0908657.
  • a suitable conventional operating device for example of the hydraulic transmission type such as that described in EP 1121997 or EP 0908657.
  • said operating device enables the ends 20 and 22 of the hinged arms 12 and 14 to be widened apart by rotating them about the relative hinge axes 28 and 30, so that the other ends, shaped as jaws 24 and 26 respectively, of said arms move towards each other to embrace and press a tubular connector (not shown) to be pressed.
  • the two arms 12 and 14 are similar to the hinged arms of known two-jaw pipe pressing tongs, the only difference being that the angular width of the two jaws 24 and 26 is 120 degrees instead of 180 degrees.
  • the two jaws 24 and 26 (each of angular width 120 degrees, as stated) have a total angular extension of 240 degrees.
  • the round angle (necessary to completely embrace the connector) is completed by the third jaw 32.
  • the third jaw 32 is forced to advance so that it passes from its position shown by full lines in Figure 1 to the position shown by dashed lines in the same figure and by full lines in Figure 2.
  • the combined action of the three jaws 24, 26 and 32 enables a radial compression or pressing action to be exerted on the tubular connector which is much more uniformly distributed than by pipe pressing tongs having only two jaws or known three-jaw pressing tongs.
  • the pipe pressing tongs of the invention not only is joint ovalization prevented, but the O-ring present in the joint is subjected to a radial compression which is essentially uniformly distributed circumferentially, to hence obtain maximum sealing assurance.
  • the third jaw 32 is traversed by a pin 46 parallel to the axes 28, 30, its two projecting ends being received in relative recesses 48 provided in the inner face of the plates 16.
  • the two recesses 48 are slotted in the direction of the axis of the tongs 10.
  • the pin 46 and the slotted recesses 48 in practice constitute the initially stated guide and limit stop means for the third jaw 32.
  • the two arms 12 and 14 are shaped in such a manner that there is a region of permanent contact, in which spherical cup-shaped cavities 50 and 52 are provided to receive one and the same ball 54.
  • the ball 54 and the spherical cup-shaped cavities 50 and 52 constitute the initially stated means for ensuring the symmetrical synchronous movement of the two arms 12 and 14 relative to the third jaw 32.
  • hinged arms 12 and 14 close to their ends 20 and 22 present usual cut-away parts for the purpose of lightening the tongs 10.
  • a return spring (not shown for simplicity) can be provided for the third jaw 32, enabling the third jaw 32 to automatically return to its most retracted position (that of Figure 1) when the first two jaws 24 and 26 are widened apart. It should however be noted that the return spring for the third jaw 32 is not indispensable, because when the operator opens the tongs manually to position them about the connector to be pressed, the operator tends to exert a forward thrust which automatically causes the third jaw to retract.

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP03003379A 2003-02-14 2003-02-14 Rohrzange Withdrawn EP1447522A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03003379A EP1447522A1 (de) 2003-02-14 2003-02-14 Rohrzange

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03003379A EP1447522A1 (de) 2003-02-14 2003-02-14 Rohrzange

Publications (1)

Publication Number Publication Date
EP1447522A1 true EP1447522A1 (de) 2004-08-18

Family

ID=32668977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03003379A Withdrawn EP1447522A1 (de) 2003-02-14 2003-02-14 Rohrzange

Country Status (1)

Country Link
EP (1) EP1447522A1 (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2396497A4 (de) * 2009-02-12 2017-05-24 Sandvik Mining and Construction Oy Verfahren zur verwendung eines halters und halter
CN107695907A (zh) * 2017-11-22 2018-02-16 沈阳艾博斯特科技有限公司 钳子
CN113146552A (zh) * 2021-04-25 2021-07-23 中国人民解放军空军工程大学航空机务士官学校 一种钢索接头编结夹具

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5669653A (en) * 1995-10-05 1997-09-23 Bilco Tools, Inc. Fluid powered backup tong and method
US5702139A (en) * 1995-10-13 1997-12-30 Buck; David A. Back-up power tongs
US6116118A (en) * 1998-07-15 2000-09-12 Wesch, Jr.; William E. Gripping apparatus for power tongs and backup tools

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5669653A (en) * 1995-10-05 1997-09-23 Bilco Tools, Inc. Fluid powered backup tong and method
US5702139A (en) * 1995-10-13 1997-12-30 Buck; David A. Back-up power tongs
US6116118A (en) * 1998-07-15 2000-09-12 Wesch, Jr.; William E. Gripping apparatus for power tongs and backup tools

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2396497A4 (de) * 2009-02-12 2017-05-24 Sandvik Mining and Construction Oy Verfahren zur verwendung eines halters und halter
CN107695907A (zh) * 2017-11-22 2018-02-16 沈阳艾博斯特科技有限公司 钳子
CN113146552A (zh) * 2021-04-25 2021-07-23 中国人民解放军空军工程大学航空机务士官学校 一种钢索接头编结夹具

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