EP0179112B1 - Verbesserungen an handwerkszeugen mit hydraulischer betätigung des antriebsteils - Google Patents

Verbesserungen an handwerkszeugen mit hydraulischer betätigung des antriebsteils Download PDF

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Publication number
EP0179112B1
EP0179112B1 EP85902052A EP85902052A EP0179112B1 EP 0179112 B1 EP0179112 B1 EP 0179112B1 EP 85902052 A EP85902052 A EP 85902052A EP 85902052 A EP85902052 A EP 85902052A EP 0179112 B1 EP0179112 B1 EP 0179112B1
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EP
European Patent Office
Prior art keywords
piston
chamber
valve
hand tool
cylinder
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
Application number
EP85902052A
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English (en)
French (fr)
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EP0179112A1 (de
Inventor
Marcel Bussereau
Alain Courtois
Jean-Pierre Huet
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.)
D'etude Et De Methode D'applications (sema) Sarl Ste
Original Assignee
D'etude Et De Methode D'applications (sema) Sarl Ste
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Publication of EP0179112A1 publication Critical patent/EP0179112A1/de
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Publication of EP0179112B1 publication Critical patent/EP0179112B1/de
Expired legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
    • F15B11/02—Systems essentially incorporating special features for controlling the speed or actuating force of an output member
    • F15B11/028—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force
    • F15B11/036—Systems essentially incorporating special features for controlling the speed or actuating force of an output member for controlling the actuating force by means of servomotors having a plurality of working chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/30—Directional control
    • F15B2211/305—Directional control characterised by the type of valves
    • F15B2211/30505—Non-return valves, i.e. check valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/405—Flow control characterised by the type of flow control means or valve
    • F15B2211/40515—Flow control characterised by the type of flow control means or valve with variable throttles or orifices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/42—Flow control characterised by the type of actuation
    • F15B2211/421—Flow control characterised by the type of actuation mechanically
    • F15B2211/423—Flow control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/40—Flow control
    • F15B2211/46—Control of flow in the return line, i.e. meter-out control
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/505—Pressure control characterised by the type of pressure control means
    • F15B2211/50509—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means
    • F15B2211/50518—Pressure control characterised by the type of pressure control means the pressure control means controlling a pressure upstream of the pressure control means using pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/521—Pressure control characterised by the type of actuation mechanically
    • F15B2211/523—Pressure control characterised by the type of actuation mechanically manually, e.g. by using a lever or pedal
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/50—Pressure control
    • F15B2211/52—Pressure control characterised by the type of actuation
    • F15B2211/528—Pressure control characterised by the type of actuation actuated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/705—Output members, e.g. hydraulic motors or cylinders or control therefor characterised by the type of output members or actuators
    • F15B2211/7051—Linear output members
    • F15B2211/7055—Linear output members having more than two chambers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/70—Output members, e.g. hydraulic motors or cylinders or control therefor
    • F15B2211/76—Control of force or torque of the output member

Definitions

  • the invention relates to tools in which pressure must be exerted on a working member, mounted movably in a head, by a hydraulic cylinder actuated by a suction and treading pump, at least so far, with manual control.
  • such tools are pliers (for bending, cutting, punching, crimping, etc.), the hydraulic cylinder used to control the movement of one jaw, called movable, relative to another, called fixed, both mounted in a head.
  • pliers for bending, cutting, punching, crimping, etc.
  • fixed the hydraulic cylinder used to control the movement of one jaw
  • these tools are also convertible, the jaw head being interchangeable and fixed to the end of the jack through which the piston rod of said jack emerges, so as to allow the type and size of the jaws to be adapted. at work to be done.
  • a given head can receive jaws of various shapes and sizes.
  • the pressures to be exerted on the workpieces are always high and the hydraulic cylinder must develop relatively high pressures, of the order of 700 bars and often more.
  • the stroke of the end of the operating handle is limited by the need for one-handed operation, for example to about 80 mm and the lever arm can only be increased by decreasing the stroke of the piston. the pump, while the number of piston strokes is obviously inversely proportional to this stroke.
  • the invention relates to a certain number of improvements to the tools of the aforementioned kind relating to the structure of the jack, as well as to the arrangement and the structure of the handle.
  • the invention provides, for the actuator, a stepped piston allowing a relatively large advancement amplitude per stroke, then decreasing in successive stages, each decrease corresponding, on the other hand, to an increase in the total thrust for the same force exerted on the lever of the pump.
  • Stepped piston cylinders are known in themselves, they are differential cylinders (see for example FR-A-2 242 584), which make it possible to obtain a motive force varying with the stroke, during the admission of '' a high pressure fluid.
  • the force applied to the workpieces is a function of the effort provided by the operator and can only vary with this effort when the values of d and D defined above have been chosen.
  • the subject of the invention is a tool comprising at least one mobile working member, the relative displacement of which relative to at least one so-called fixed working member is linked to that of the piston of a single-acting hydraulic cylinder which is actuated by a suction and treading pump, in which the piston is a stepped piston which fits into the cylinder body so as to delimit, in addition to the axial main chamber, at least one annular chamber, the annular chamber or chambers being placed successively in communication with the axial chamber during the advancement of the piston, remarkable in that, even at the end of the stroke, each step segment of the piston has at least one peripheral zone which remains in guide contact with an internal surface of the body of the jack, that in this area at least one seal provides sealing between the upstream and downstream chambers and that the pressure supply to each annular chamber is ensured by a radial pipe which opens at one of its ends into the delivery pipe of the pump and the other end of which is uncovered by the piston when the advancement of the latter reaches a predetermined value, while each chamber communicates
  • the arrangement in steps of the piston of the jack may interest the external lateral surface of said piston cooperating with conjugated shoulders of the internal lateral surface of the body of the jack. It can also be provided on the internal surface of an axial digging of the piston capping a core traversed longitudinally by the discharge pipe of the pump and having conjugated shoulders.
  • the invention also relates to a particular structure and position of the handle.
  • the latter has two branches respectively fixed and mobile, subjected to the action of an elastic means tending to separate them from one another in the manner of those of a pruner, and the bisector of the angle formed by said branches in the maximum spacing position is substantially perpendicular to the longitudinal axis of the jack.
  • a safety valve limiting the pressure at the end of the stroke, the sudden return of which produces a click constituting an audible signal and which, being able to be controlled manually, simultaneously plays the role of relief valve of the axial main chamber. It is therefore advantageous to provide a single lever for controlling the discharge valves of the different chambers.
  • a tool according to the invention comprises a hydraulic cylinder having a body 1 in which slides, in the direction of the arrow F "a piston 2 under the action of the thrust of a fluid from a reservoir 3, while the return of the piston, when the hydraulic thrust ceases, is ensured by the action of a helical spring 4 working under compression.
  • the fluid is extracted from reservoir 3 and sent to the piston, in a pipeline of delivery 5 by a suction and treading pump, the piston 7 of which is actuated by means of a manually-operated swinging arm 8.
  • the passage and retention of the fluid during suction, then delivery are ensured by two opposite non-return valves 9a and 9b.
  • the arm 8 can be operated with one hand and for this purpose it is associated with a fixed arm 6 (FIG. 1) from which it departs under the action of an elastic means (not shown) for controlling the suction and which it approaches by manual action to ensure delivery under pressure, the two arms, fixed and oscillating, being grasped in the operator's hand in the manner of the two handles of a pruning shears.
  • the piston 2 has at its internal end, an axial hollow 10 delimiting a tail or skirt 11 connected, on the opposite side, to the head of the piston by a shoulder 12 forming one of the bearing surfaces of the spring 4.
  • the interior of the cylinder 1 is machined so as to present a housing conjugate to the particular shape of the piston, with a central chamber 13 delimited by the bottom of the excavation 10 and an annular chamber 14 delimited by the end face of the tail 11 of the piston .
  • the central chamber 13 is supplied by the delivery pipe 5 which opens directly into said chamber.
  • the annular chamber 14 first filled by vacuum as will be said below, is then supplied by a radial pipe 16 starting from the discharge pipe 5 and whose orifice in the room 14 remains closed during the first part of the piston stroke.
  • a number of O-rings and rings seal the moving parts and isolate the chambers 13 and 14 from each other until the orifice of the pipe 16 is not discovered.
  • a relief valve 17 retained on its seat by a calibrated spring 18 is interposed on a pipe 15 putting the delivery pipe 5 into communication with the tank 3.
  • the valve 17 is raised from its seat to free the passage of the fluid, either automatically when the hydraulic pressure exceeds the setting of the spring 18, then playing the role of safety to avoid deterioration of the cylinder, or under the action of a lever 20 operated manually (arrow F 3 ) to obtain retraction of the piston during work or at the end of work.
  • a lever 20 operated manually (arrow F 3 ) to obtain retraction of the piston during work or at the end of work.
  • the retraction of the piston also requires the emptying of the annular chamber 14.
  • a pusher 19 allows the erasure of a ball valve 21 interposed between the two parts 22a and 22b of a pipe connecting the chamber 14 and the reservoir 3.
  • the pusher 19 is controlled manually, at the same time as the valve 17 by the lever 20. It should be noted here that for reasons of clarity, FIG. 2 is conventional. In reality, the longitudinal axis of the valve 17 and of the pipe 15 is not in the same diametral plane as the axis of the pusher 19, the middle part 22 c (indicated in the figure in broken lines) of the pipe 22a , 22 b not cutting the housing of the valve 17. In fact, the valve 17 and the pusher 19 are angularly offset in a transverse plane relative to the axis of the jack, the lever 20 extending itself transversely relative to this axis and having one end 20a folded back 90 degrees (Figure 1) to be operated by the thumb of the operator.
  • each stroke of the pump brings into the chamber 13 a volume of fluid determined by the diameter and the stroke of the piston 7 of the pump, for example 170 mm 3 .
  • the chamber 13 is active and if the bottom of the digging 10 is, for example, 283 mm 2 (diameter 19 mm), each stroke of the pump will advance the piston by 0.6 mm.
  • the volume of liquid supplied at each stroke of the pump is distributed between the chambers 13 and 14, that is to say over a larger total surface, for example 2 1/2 times the first and the advancement per stroke will only be 0.24 mm, but at the same time the same manual effort will exert a pressure 2 1/2 times stronger.
  • the end of the cylinder 1 corresponding to the outlet of the piston 2 can be provided with an external thread 23 intended to receive by screwing a fixing ring 25 for a head 28 of interchangeable tool.
  • This arrangement makes it possible first of all to have a single cylinder for tools of the same type but of different sizes and also for tools of different types, for example pliers for crimping, punching, cutting, bending, etc. .
  • by screwing or unscrewing the ring 25 one can adjust the initial position of the movable working member 26 and therefore the initial spacing of the working members 26 and 27 depending on the dimensions of the object or the material to be processed.
  • the reservoir 3 is semi-rigid, that is to say retractable and expandable so as to follow the variations in volume of the liquid remaining in reserve without risk of entry of air. For this it is simply engaged elastically on an appendage in the form of a ring 24 of the cylinder 1 on which it is held by an elastic ring cooperating with a circular groove.
  • annular chambers such as 14 each corresponding, at the time of their communication with the discharge line 5, to an increase in the total pressure exerted by the mobile tool and to a decrease in forward speed.
  • the arrangement in steps of the piston of the jack can also be carried out by an interlocking of the piston in the body with shoulders of the external lateral surface of the piston and combined shoulders of the internal lateral surface of the body of the jack.
  • Such an embodiment with two annular chambers (three forward speeds) is shown very schematically in Figure 3.
  • each annular chamber communicates with the housing of the valve 21 by a pipe 22 b for filling by depression and discharge.
  • the discharge pipe 5 extends through a bore non outlet 5a formed axially in the piston 102 to feed the pipes 116a and 116 b .
  • the handles 6 and 8 respectively fixed and mobile, have an insulating coating provided with fingerprints and guards 6a, 8a.
  • the plane B perpendicular to the longitudinal axis of the jack and passing through the articulation axis of the movable handle 8, is close to the bisector plane handles 6 and 8 in the maximum spacing position.
  • the fixed handle 6 has a section in U and the movable handle 8 is embedded at least partially in this U.
  • the stepped position of the piston makes it possible to reduce in large proportions the engine force to be exerted on the piston 7 of the pump. It is then possible to actuate this piston by a cam or a connecting rod driven by a light electric motor of sufficiently low power to be powered by accumulators or rechargeable batteries incorporated, for example, in the then fixed handle of the tool.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Actuator (AREA)
  • Shearing Machines (AREA)
  • Fluid-Pressure Circuits (AREA)
  • Portable Power Tools In General (AREA)

Claims (8)

1. Handwerkzeug, das mindestens ein bewegliches Arbeitsorgan (26) aufweist, dessen relative Verschiebung gegenüber mindestens einem gleichartigen festen Arbeitsorgan (27) an die Verschiebung des Kolbens (2) eines einfachwirkenden Hydraulikzylinders gebunden ist, welcher durch Flüssigkeit aus einem Behälter (3) durch den Druckkanal (5) einer Saug- und Druckpumpe (7) gespeist wird, wobei der Kolben (2) ein mehrstufiger Kolben ist, der im Zylinderkörper (1) so einfügt ist, daß außer der axialen Hauptkammer (13) wenigstens eine ringförmige Kammer (14) begrenzt wird und die ringförmige(n) Kammer(n) im Verlauf des Vorwärtsbewegung des Kolbens (2) nacheinander mit der axialen Kammer in Verbindung gebracht wird bzw. werden, dadurch gekennzeichnet, daß jeder Stufenabschnitt des Kolbens (2) mindestens einen Umfangsbereich besitzt, der in Führungskontakt mit einer inneren Oberfläche des Zylinderkörpers (1) bleibt, und daß in diesem Bereich mindestens eine Dichtung die Abdichtung zwischen höherdruckseitigen (13) und niederdruckseitigen (14) Kammern sichert, und daß die Speisung jeder ringförmigen Kammer (14) unter Druck durch eine radiale Leitung (16) bewirkt wird, die mit ihrem einen Ende in die Druckleitung (5) der Pumpe (7) mündet und deren anderes Ende vom Kolben (2) freigegeben wird, wenn die Vorwärtsbewegung des letzteren einen vorher festgelegten Wert erreicht, während jede Kammer (13, 14) mit dem Flüssigkeitsbehälter (3) durch ein mit Ventilen (17, 21) versehenes Leitungssystem (15, 22a-22c) in Verbindung steht, das am Ende des Arbeitsvorganges die Entleerung der jeweiligen Kammer durch manuelles Betätigen des Ventils und im Falle des ringförmigen Kammern zu Beginn das Auffüllen der jeweiligen Kammer (14) durch Unterdruck bewirkt.
2. Handwerkzeug nach Anspruch 1, dadurch gekennzeichnet, daß der Kolben (2) mit einer axialen Ausnehmung (10) versehen ist, die einen Kern entsprechender Form überdeckt, der im Inneren des Zylinderkörpers (1) auskragt und der der Länge nach von der Druckleitung (5) durchsetzt ist.
3. Handwerkzeug nach Anspruch 1, dadurch gekennzeichnet, daß die stufenweise Ausbildung des Kolbens (102) auf der äußeren seitlichen Oberfläche desselben vorhanden ist und mit entsprechenden Schultern an der inneren seitlichen Oberfläche des Zylinderkörpers zusammenwirkt.
4. Handwerkzeug nach einem der Ansprüche 1-3, dadurch gekennzeichnet, daß das Ventil (17), das in der Entleerungsleitung (15) der Hauptkammer (13) zum Flüssigkeitsbehälter (3) angebracht ist, der Einwirkung einer bestimmten Federkraft (18) unterliegt, die es in Richtung auf seinen Sitz belastet derart, daß die Funktion des Sicherheitsventils erfüllt und der hydraulische Enddruck so auf einen definierten Wert begrenzt wird.
5. Handwerkzeug nach Anspruch 4, dadurch gekennzeichnet, daß die bestimmte Federkraft (18) derart gewählt ist, daß die Bewegung des Ventils (17) auf seinen Sitz nach der Entleerung ausreichend schnell und ausreichend lang ist, um ein Geräusch zu bewirken, das ein lautes Signal für das Ende des Arbeitsvorganges darstellt.
6. Handwerkzeug nach einem der Ansprüche 1-5, dadurch gekennzeichnet, daß das Entleerungsventil (17) der Hauptkammer und das Entleerungsventil (19) der ringförmigen Kammern von demselben manuellen Antrieb (20) gesteuert werden.
7. Handwerkzeug nach einem der Ansprüche 1-6, dadurch gekennzeichnet, daß der Kolben (7) der Pumpe in bekannter Weise von einem Nocken oder Pleuel angetrieben wird, der bzw. das von einem durch Akkumulatoren oder durch im ihm angeordnete aufladbare Batterien angetriebenen Motor betätigt wird.
8. Handwerkzeug nach einem der Ansprüche 1-6, bei welchem der Kolben (7) der Pumpe von einem manuellen Antrieb gesteuert wird, der aus einem Griff mit zwei Armen besteht, von denen einer fest (6) und der andere beweglich (8) ist, und beide Arme der Einwirkung eines elastischen Teiles unterliegen, welches sie auseinanderbewegt, dadurch gekennzeichnet, daß die zur Achse des Zylinders senkrechte und durch die Gelenkachse des beweglichen Armes (8) des Griffes verlaufende Ebene der Halbierungsebene der beiden Arme (6, 8) des Griffes bei maximalem Abstand benachbart ist.
EP85902052A 1984-04-20 1985-04-19 Verbesserungen an handwerkszeugen mit hydraulischer betätigung des antriebsteils Expired EP0179112B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8406346 1984-04-20
FR8406346A FR2563291A1 (fr) 1984-04-20 1984-04-20 Verin hydraulique a commande manuelle

Publications (2)

Publication Number Publication Date
EP0179112A1 EP0179112A1 (de) 1986-04-30
EP0179112B1 true EP0179112B1 (de) 1989-04-05

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP85902052A Expired EP0179112B1 (de) 1984-04-20 1985-04-19 Verbesserungen an handwerkszeugen mit hydraulischer betätigung des antriebsteils

Country Status (6)

Country Link
US (1) US4823588A (de)
EP (1) EP0179112B1 (de)
JP (1) JPS61502246A (de)
DE (1) DE3569219D1 (de)
FR (1) FR2563291A1 (de)
WO (1) WO1985004831A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4026708C2 (de) * 1989-08-31 2002-10-10 Sema Sarl Schnellvorschubvorrichtung für einen einfach wirkenden hydraulischen Arbeitszylinder

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US4947672A (en) * 1989-04-03 1990-08-14 Burndy Corporation Hydraulic compression tool having an improved relief and release valve
WO1993001030A1 (fr) * 1991-07-04 1993-01-21 Sovetsko-Britanskoe Sovmestnoe Predpriyatie 'ural' Dispositif d'intervention et de reparation et sa pompe
US5218878A (en) * 1992-01-23 1993-06-15 Eaton Corporation Two-stage range piston-cylinder assembly
US5287723A (en) * 1992-05-11 1994-02-22 Corcoran Industries Device for deforming a smooth surfaced pipe
DE9305607U1 (de) * 1993-04-14 1993-06-17 Minnesota Mining And Manufacturing Co., Saint Paul, Minn. Werkzeug zum Verpressen von isolierten Leitern in einem elektrischen Verbinder
FR2708673A1 (fr) * 1993-07-30 1995-02-10 Dubuis Pompe volumétrique à piston animé d'un mouvement linéaire alternatif.
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US5826562A (en) * 1994-07-29 1998-10-27 Caterpillar Inc. Piston and barrell assembly with stepped top and hydraulically-actuated fuel injector utilizing same
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DE19944229B4 (de) * 1999-09-15 2016-07-28 Gustav Klauke Gmbh Hydraulisches Handpressgerät und auswechselbarer Gerätekopf hierfür
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DE3569219D1 (en) 1989-05-11
US4823588A (en) 1989-04-25
FR2563291A1 (fr) 1985-10-25
WO1985004831A1 (fr) 1985-11-07
JPS61502246A (ja) 1986-10-09
EP0179112A1 (de) 1986-04-30

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