EP0220639B1 - Mit einer Hand bedienbare, hydraulisch angetriebene Biegevorrichtung - Google Patents

Mit einer Hand bedienbare, hydraulisch angetriebene Biegevorrichtung Download PDF

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Publication number
EP0220639B1
EP0220639B1 EP86114499A EP86114499A EP0220639B1 EP 0220639 B1 EP0220639 B1 EP 0220639B1 EP 86114499 A EP86114499 A EP 86114499A EP 86114499 A EP86114499 A EP 86114499A EP 0220639 B1 EP0220639 B1 EP 0220639B1
Authority
EP
European Patent Office
Prior art keywords
reservoir
matrix
handle
pump
oil
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.)
Expired - Lifetime
Application number
EP86114499A
Other languages
English (en)
French (fr)
Other versions
EP0220639A3 (en
EP0220639A2 (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
Priority to AT86114499T priority Critical patent/ATE54585T1/de
Publication of EP0220639A2 publication Critical patent/EP0220639A2/de
Publication of EP0220639A3 publication Critical patent/EP0220639A3/en
Application granted granted Critical
Publication of EP0220639B1 publication Critical patent/EP0220639B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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

Definitions

  • Tube bending devices are known as well that have more moderate dimensions, can be operated with a single hand, which are used in special cases, as it is common knowledge among the users, for example to bend tubes on place during their installation.
  • Both the anchorable-type devices and the portable-type devices that can be operated with a single hand can, generally speaking, be of two kinds, that is those driven by a mechanical transmission and those having a hydraulic tramsmission.
  • the present invention refers to the tube bending devices that can be operated with a single hand and having a hydraulic transmission.
  • the known devices are heavy and require a considerable physical strength for their operation, the almost continuous use of same thus becoming very fatiguing; they are cumbersome, thereby making their use difficult and sometimes even impossible; they are not easily grasped and their training causes problems, especially in particular rooms and conditions, as is common knowledge among the specific operators, and, last but not least, to realize them a complicated manufacture is required, which is therefore expensive both from the point of view of building and from the point of view of maintenance.
  • the dimensions being equal, they do not permit to bend tubes having a certain resistance, like rubber-lined steel tubes.
  • reference numeral 1 denotes a matrix-die holding bar; 2 a return item, like a spring; 3 the inner head of bar 1, which is provided with a sealing gasket 4 and can slide within cylinder 5.
  • reference numeral 6 denotes the outer body of the handle 7, which comprises a tubular item concentrical with 5 and having its two ends firmly connected with sleeve 8 and body 9 of the device, which body is manufactured as a unit construction with the remaining lower par, which is generally denoted by 10.
  • Reference numeral 11 denotes a cavity obtained in the lower part of the body 10 and forming an oil reservoir; 12 denotes an elastic bellows type membrane, for example a rubber membrane or a membrane made of plastics or other suitable material, which is sealingly locked in its position by means of the rigid washer 13.
  • 12 denotes an elastic bellows type membrane, for example a rubber membrane or a membrane made of plastics or other suitable material, which is sealingly locked in its position by means of the rigid washer 13.
  • Reference numeral 14 denotes the support, also obtained in the lower part of reference 10, of item 15 which holds the counterdies 16, said support being provided with a hole 17, a perpendicular hole, in which the cylindrical shank 18 of item 15 is nested, said shank being provided with stop 19, like a movable ball inserted with a spring, which prevents the shank 18 from being unintentionally removed, and consequently item 15, which item 15 remains therefore in place, its rotation being moreover prevented by shoulder 20 and respective counter shoulder.
  • Reference numeral 21 denotes a gap between items 5 and 6 which is provided to let the fluid (oil) flow in both directions, that is in the working stroke of the device, when bar 1 is moved forward, and in the release stroke, when the oil flows back thus allowing the withdrawal of bar 1 under the action of spring 2 after the work has been completed.
  • Reference numeral 22 denotes a check valve, for example of the ball type, that allows oil to flow from reservoir 11 to chamber 23 whilst 24 denotes a second check valve, which also consists in a ball that is pressed against a sealing seat by a spring and allows oil to flow from said chamber 23 to the gap chamber 21.
  • Said gap 21 is hydraulically connected with valve chamber of valve 24 and, by means of passage ways 40, with the chamber 43, said passage ways 40 being made in lengthwise direction within the blind-bottom sleeve 8 in correspondence with the threaded part of cylinder 5 on which the sleeve is screwed.
  • Reference numeral 25 denotes a plunger that can freely slide axially within a cylindrical guiding bush 26 which has on its end facing chamber 23, an annular gasket 27 that seals plunger 25.
  • a dolly spring 29 is engaged which is compression-loaded to allow afterwards the return, said spring finding reaction on an abutment formed at the end of chamber 23.
  • Reference numeral 30 denotes a ball that is interposed between the head of the plunger 25 and the lever arm 31, said lever arm having its fulcrum on pivot 32.
  • Reference numeral 33 denotes a stopping screw that is threaded on the body of lever 31 and abuts on the pump body 10 with its head, said spring being provided for the purpose of presetting the useful stroke of the lever 31.
  • Reference numeral 34 denotes a vent hole and 35 denotes a pipe to the oil reservoir 11, through said pipe 35 said oil being discharged on back-flow.
  • Said passage orifice 36 is closed by a cock 37 that comprises an outer handwheel 38, which can be operated by hand, with threaded rod 39 the smaller head of which sealingly presses ball 41 against the corresponding orifice of conduit 36 by sliding coaxially with same when the handwheel 38 is turned and lets on the contrary the orifice of passage way 36 free when the handwheel 38 is turned in the opposite direction.
  • a cock 37 that comprises an outer handwheel 38, which can be operated by hand, with threaded rod 39 the smaller head of which sealingly presses ball 41 against the corresponding orifice of conduit 36 by sliding coaxially with same when the handwheel 38 is turned and lets on the contrary the orifice of passage way 36 free when the handwheel 38 is turned in the opposite direction.
  • the working mode is as follows.
  • the device is grasped with a single hand holding it on the cylindrical body 7 and the lever 31.
  • plunger 25, onto which acts the annular sealing gasket 27, is pushed and slides within the cylinder 23, and said chamber being filled with oil the penetration of said plunger inside said chamber causes the delivery valve to be opened and a quantity of oil equal to the volume of the part of the plunger that has penetrated into the cylinder to pass in gap 21.
  • Chamber 23 is then filled with new oil, thereby restoring the original conditions for a new pumping cycle.
  • Every pumping cycle causes then the bar 1 to move forward on which there is installed a matrix-die the dimensions of which are suitable for the tube to be bent; thus the matrix-die approaches step by step the corresponding counter-dies 16 and causes the interposed tube to be progressively bent.
  • the invention attains all the intended objects and allows moreover, the total length being equal, to realize larger radius bendings because the working stroke that the matrix-die holding bar 1 permits is much longer; such an advantage is rather remarkable too because it permits to attain in a substantial way larger radii than can be attained by means of the presently known tube bending devices of the type under discussion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Bending Of Plates, Rods, And Pipes (AREA)
  • Arrangement Or Mounting Of Control Devices For Change-Speed Gearing (AREA)
  • Tubes (AREA)
  • Shaping Of Tube Ends By Bending Or Straightening (AREA)

Claims (4)

1. Mit einer Hand bedienbare hydraulisch angetriebene Biegevorrichtung für Rohre, deren Haltestange (1) für die Matrize durch die Wirkung einer Flüssigkeit (01) bewegt wird, die durch eine hydraulische Pumpe (23, 25, 28, 29) verdrängt wird, die mit der Vorrichtung ein Ganzes bildet, dadurch gekennzeichnet, daß die hydraulische Pumpe, deren Längsachse parallel zum festen Teil (7) eines Handgriffes verläuft, an diesem Teil auf der gleichen Seite wie die Matrize und Patrize angeordnet ist, daß der Behälter (11) für die Flüssigkeit (ÖI) im Arm (14) oder der Platte ausgebildet ist, an dem der Halter (15) für die Patrize angeordnet ist, wobei eine der Wände dieses Behälters, vorzugsweise der Boden, ähnlich einem elastischen oder elastisch verformbaren Balg oder einer Membran (12) dichtend verformbar ist, daß die Pumpe, die Leitungen, der Behälter und die Kammer, in der die Haltestange für die Matrize gleitet, einen geschlossenen Kreislauf bilden, und daß die Flüssigkeit (Öl) von der Pumpe zum Kopf (3) der Haltestange der Matrize über eine Leitung gelangt, die im festen Teil des Handgriffes (7) angeordnet und durch ein rohrförmiges Element (6) gebildet wird, das auch den äußeren Teil des Handgriffes (7) bildet und konzentrisch zum Zylinder (5) verläuft, in dem die Haltestange (1) für die Matrize gleitet, wobei dieses rohrförmige Element (6) dicht am Konstruktionskörper (10) verankert und an der Rückseite durch eine am rohrförmigen Element (6) dicht befestigte Verschlußhülse oder Kappe (8) verschlossen ist.
2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Pumpe mittels eines hebelartigen beweglichen Teiles (31) des Handgriffes betätigbar ist, wobei dieser hebelähnliche Teil unter dem festen Teil (7) des Handgriffes angeordnet und sowohl der feste als auch der bewegliche Teil innerhalb des Bereiches einer einzigen Hand liegen und die Stellung des hebelähnlichen Teiles relativ zum festen Teil mittels eines Drückers (33), ähnlich einer Schraube, einstellbar ist, der gegen den Konstruktionskörper (10) drückt.
3. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Membran (12) oder der Balg, die bzw. der elastisch verformbar ist und die bewegliche Wand bildet sowie den Behälter verschließt, von dem eine Wand in Verbindung mit der Außenluft steht, im Behälter angeordnet ist und einen Schutz für den Behälter bildet, wobei der offene Boden dieses Balges durch ein weiteres Schutzelement (13) ähnlich einer Abdeckscheibe geschlossen ist und in dieser Abdeckscheibe mindestens eine Öffnung (34) ähnlich einer Durchgangsbohrung vorgesehen ist, die die Membran mit der Außenluft verbindet.
4. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß der Halter (15) für die Patrize (16) mittig mit mindestens einer Verlängerung (18) versehen ist, die in einem entsprechenden Lager angeordnet ist, das quer im Arm oder der Platte, an dem der Halter angebracht ist, verläuft, wobei der Halter gegen Verdrehung und Verschiebung durch geeignete Verriegelungsorgane, wie eine Schulter (20) und eine Gegenschulter sowie eine Arretierung (19) mit einer elastisch gelagerten Kugel, verriegelt ist.
EP86114499A 1985-10-31 1986-10-20 Mit einer Hand bedienbare, hydraulisch angetriebene Biegevorrichtung Expired - Lifetime EP0220639B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86114499T ATE54585T1 (de) 1985-10-31 1986-10-20 Mit einer hand bedienbare, hydraulisch angetriebene biegevorrichtung.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT3492785U 1985-10-31
IT8534927U IT207711Z2 (it) 1985-10-31 1985-10-31 Apparecchio curvatubi a trasmissione idraulica azionabile con una sola mano

Publications (3)

Publication Number Publication Date
EP0220639A2 EP0220639A2 (de) 1987-05-06
EP0220639A3 EP0220639A3 (en) 1988-09-07
EP0220639B1 true EP0220639B1 (de) 1990-07-18

Family

ID=11240966

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86114499A Expired - Lifetime EP0220639B1 (de) 1985-10-31 1986-10-20 Mit einer Hand bedienbare, hydraulisch angetriebene Biegevorrichtung

Country Status (5)

Country Link
EP (1) EP0220639B1 (de)
AT (1) ATE54585T1 (de)
DE (1) DE3672747D1 (de)
ES (1) ES2016792B3 (de)
IT (1) IT207711Z2 (de)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT230365Y1 (it) * 1993-07-16 1999-06-02 Imb Srl Utensile per punzonare
IT237303Y1 (it) * 1995-11-23 2000-09-05 Cbc Spa Apparecchio curvatubi a trasmissione idraulica

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1164123A (fr) * 1957-01-11 1958-10-06 Pince hydraulique à main
GB882614A (en) * 1959-02-25 1961-11-15 Mekler Dan Improvements in or relating to hydraulic tools, adapted to be held and operated with one hand
FR2100998B1 (fr) * 1970-08-04 1973-04-27 Breton Leslie Le Outil pour cintrage de tubes
CH610232A5 (de) * 1975-01-27 1979-04-12 Erich K Schmitter
CH597985A5 (en) * 1975-03-06 1978-04-28 Willy Fluckiger Pneumatic pincers for crimping eyelet onto cable
US4149381A (en) * 1977-07-13 1979-04-17 Dan Mekler Single hand operated tool
IT1156153B (it) * 1978-04-06 1987-01-28 Liri Costruzioni Mecc Perfezionamento in un apparecchio curvatubi idraulico portatile a comando manuale provvisto di testa girevole ed elementi curvanti reversibili per invertire la direzione del la curvatura del tubo
FR2466115A1 (fr) * 1979-09-24 1981-03-27 Sicame Sa Pince a main pour le sertissage de connexions electriques
JPS585156B2 (ja) * 1980-03-24 1983-01-29 株式会社 大洋発條製作所 スナツプリング用の油圧式プライヤ−

Also Published As

Publication number Publication date
EP0220639A3 (en) 1988-09-07
ATE54585T1 (de) 1990-08-15
DE3672747D1 (de) 1990-08-23
ES2016792B3 (es) 1990-12-01
IT8534927V0 (it) 1985-10-31
IT207711Z2 (it) 1988-02-08
EP0220639A2 (de) 1987-05-06

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