EP0775538A1 - Hydraulisch angetriebene Rohrbiegevorrichtung - Google Patents

Hydraulisch angetriebene Rohrbiegevorrichtung Download PDF

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Publication number
EP0775538A1
EP0775538A1 EP96117812A EP96117812A EP0775538A1 EP 0775538 A1 EP0775538 A1 EP 0775538A1 EP 96117812 A EP96117812 A EP 96117812A EP 96117812 A EP96117812 A EP 96117812A EP 0775538 A1 EP0775538 A1 EP 0775538A1
Authority
EP
European Patent Office
Prior art keywords
chamber
reservoir
cylinder
rod
conduit
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.)
Granted
Application number
EP96117812A
Other languages
English (en)
French (fr)
Other versions
EP0775538B1 (de
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
Publication of EP0775538A1 publication Critical patent/EP0775538A1/de
Application granted granted Critical
Publication of EP0775538B1 publication Critical patent/EP0775538B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D7/00—Bending rods, profiles, or tubes
    • B21D7/06—Bending rods, profiles, or tubes in press brakes or between rams and anvils or abutments; Pliers with forming dies
    • B21D7/063—Pliers with forming dies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25B—TOOLS OR BENCH DEVICES NOT OTHERWISE PROVIDED FOR, FOR FASTENING, CONNECTING, DISENGAGING, OR HOLDING
    • B25B7/00—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools
    • B25B7/12—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears
    • B25B7/126—Pliers; Other hand-held gripping tools with jaws on pivoted limbs; Details applicable generally to pivoted-limb hand tools involving special transmission means between the handles and the jaws, e.g. toggle levers, gears with fluid drive

Definitions

  • This invention relates to a pipe bending apparatus with hydraulic transmission, operable with one hand, in accordance with the precharacterising part of the main claim.
  • Apparatus of this type have been known for some time (see for example Italian utility model 207711 in the name of the present applicant). Although such apparatus provide acceptable operation they present certain drawbacks.
  • the first of these is the fact that the deformable wall of the reservoir containing the fluid for the hydraulic circuit undergoes relatively large deformation, leading to its breakage or imperfect sealing, in this latter case air bubbles possibly entering the reservoir to cause maloperation of the hydraulic circuit. It has also been found experimentally that dirt tends to accumulate in the open front part of the cylinder with the passage of time, making the movement of the rod more difficult and possibly cause it to seize.
  • An object of the present invention is to provide a pipe bending apparatus of hydraulic transmission type, operable with one hand, which obviates the aforesaid drawbacks and in particular reduces the deformation of the deformable wall of the reservoir for the hydraulic circuit fluid.
  • a further object is to provide an apparatus in which the possibility of air bubbles entering the apparatus hydraulic circuit is limited.
  • the reference numeral 1 indicates a die-carrying rod
  • 2 indicates a return element such as a spring
  • 3 indicates the inner end of the rod 1, provided with a gasket 4 for its sealing, and slidable within the cylinder 5.
  • the reference numeral 6 indicates the outer part of the apparatus handgrip, indicated overall by 7, said part 6 consisting of a tubular element concentric to the cylinder 5 and having its two ends sealedly fixed to a cap 8 and to the apparatus body 9.
  • the body 9 is advantageously formed integral with the remaining lower part, indicated overall by 10.
  • the reference numeral 11 indicates a cavity provided in the lower part of the body 10 and forming a reservoir for oil or another suitable fluid (oil distribution within the apparatus is represented by grey shading in the figures).
  • the reference numeral 12 indicates a cup-shaped elastic membrane, for example of rubber, plastic or another suitable material, which is fixed in position and sealed by a cup-shaped closure plug 13 comprising a vent hole 34.
  • a support for an element 15 carrying the counter-die 16 the element 15 being connected removably to the body 10 to allow rapid and easy replacement of the die-carrier assembly.
  • the reference numeral 21 indicates an interspace between the cylinder 5 and the piece 6 to allow the oil to pass in either direction, depending on whether the apparatus rod 1 is advancing, or returning under the action of the spring 2, the work having been completed.
  • a non-return valve 22, of ball type, enables the oil to pass from the reservoir 11 to the chamber 23.
  • the valve 22 is connected to a dip tube 60 in the centre of the reservoir 11. In this manner, even if air bubbles were to appear in the reservoir, they would not enter the hydraulic circuit of the apparatus. In this respect, whatever the inclination of the apparatus, the air bubbles would collect along the reservoir walls but never at its centre, and hence cannot enter the circuit.
  • a second non-return valve 24 enables oil to flow from the chamber 23 to the interspace 21.
  • the interspace 21 is hydraulically connected to the chamber 23 and to the chamber 43 defined by the walls of the cylinder sleeve and the gasket on the rod 1, by way of passages 40 provided within the sleeve.
  • the reference numeral 25 indicates a plunger free to slide axially within a cylindrical guide bush 26 which carries at that end facing the chamber 23 an annular gasket 27 sealing against the plunger 25.
  • a counteracting spring 29 is engaged in a support seat 28 provided on the end of the plunger 25 and acts against a shoulder formed at the end of the chamber 23.
  • the reference numeral 30 indicates a ball interposed between the end of the plunger 25 and the lever arm 31, said lever arm being pivoted on the pin 32.
  • the cylinder 5 is sealed by an element 50 which engages the body 9.
  • an element 50 which engages the body 9.
  • three usual annular gaskets 51 are provided.
  • the element 50 together with the cylinder 5 and the gasket 4 of the rod 1 define a second chamber 52 connected to the reservoir 11 via a conduit divided into two mutually perpendicular portions 53A and 53B.
  • the chamber 52 is also connected to the outside via a third conduit 54 ( Figure 2).
  • the conduit portion 53A extends beyond the perpendicular portion 53B by a conduit portion 56 connected to the chamber 24 and acting together with the portion 53A as a return tube between this latter chamber and the reservoir 11.
  • the threaded shank 39 of a cock 37 consisting of a manually operable external handwheel 38 acts on the ball 41 to close or open the passage 36.
  • the apparatus is gripped by one hand, which embraces the handgrip 7 and the lever 31.
  • the oil finds the cock 37 closed, so that it is obliged to enter the interspace 21 and then the chamber 43, where it acts against the end 3 of the rod 1, causing it to advance an initial distance against the action of the spring 2.
  • the apparatus is in this manner again ready for a new pumping cycle.
  • Each pumping cycle results in advancement of the rod 1, on which there is mounted a die of adequate size for the pipe to be bent, the die gradually approaching the corresponding counter-dies 16 to progressively bend the interposed pipe.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Supply Devices, Intensifiers, Converters, And Telemotors (AREA)
EP96117812A 1995-11-23 1996-11-07 Hydraulisch angetriebene Rohrbiegevorrichtung Expired - Lifetime EP0775538B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITMI950811U 1995-11-23
IT1995MI000811U IT237303Y1 (it) 1995-11-23 1995-11-23 Apparecchio curvatubi a trasmissione idraulica

Publications (2)

Publication Number Publication Date
EP0775538A1 true EP0775538A1 (de) 1997-05-28
EP0775538B1 EP0775538B1 (de) 1998-08-12

Family

ID=11371405

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96117812A Expired - Lifetime EP0775538B1 (de) 1995-11-23 1996-11-07 Hydraulisch angetriebene Rohrbiegevorrichtung

Country Status (5)

Country Link
EP (1) EP0775538B1 (de)
AT (1) ATE169529T1 (de)
DE (1) DE69600518T2 (de)
ES (1) ES2120795T3 (de)
IT (1) IT237303Y1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0908657A1 (de) * 1997-10-13 1999-04-14 C.B.C. S.p.A. Rohrschmiedegerät mit hydraulischem Antrieb
EP0960663A1 (de) * 1998-05-19 1999-12-01 Geberit Technik Ag Biegevorrichtung mit hydraulischem Antrieb

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201800010409A1 (it) * 2018-11-16 2020-05-16 Cml Int S P A Macchina per curvare un pezzo allungato senza formazione di grinze

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220639A2 (de) * 1985-10-31 1987-05-06 C.B.C. S.p.A. Mit einer Hand bedienbare, hydraulisch angetriebene Biegevorrichtung

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0220639A2 (de) * 1985-10-31 1987-05-06 C.B.C. S.p.A. Mit einer Hand bedienbare, hydraulisch angetriebene Biegevorrichtung

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0908657A1 (de) * 1997-10-13 1999-04-14 C.B.C. S.p.A. Rohrschmiedegerät mit hydraulischem Antrieb
EP0960663A1 (de) * 1998-05-19 1999-12-01 Geberit Technik Ag Biegevorrichtung mit hydraulischem Antrieb

Also Published As

Publication number Publication date
ITMI950811V0 (it) 1995-11-23
EP0775538B1 (de) 1998-08-12
IT237303Y1 (it) 2000-09-05
DE69600518T2 (de) 1999-01-07
ITMI950811U1 (it) 1997-05-23
ATE169529T1 (de) 1998-08-15
ES2120795T3 (es) 1998-11-01
DE69600518D1 (de) 1998-09-17

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