EP2189247B1 - Drive device for a press device and press device with such a drive device - Google Patents

Drive device for a press device and press device with such a drive device Download PDF

Info

Publication number
EP2189247B1
EP2189247B1 EP20090014524 EP09014524A EP2189247B1 EP 2189247 B1 EP2189247 B1 EP 2189247B1 EP 20090014524 EP20090014524 EP 20090014524 EP 09014524 A EP09014524 A EP 09014524A EP 2189247 B1 EP2189247 B1 EP 2189247B1
Authority
EP
European Patent Office
Prior art keywords
hydraulic
drive device
valve
pressure
emergency
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.)
Active
Application number
EP20090014524
Other languages
German (de)
French (fr)
Other versions
EP2189247A2 (en
EP2189247A3 (en
Inventor
Martin Bungter
Gunnar Gottschaldt
Sven Meyer
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.)
Novopress GmbH Pressen und Presswerkzeuge and Co KG
Original Assignee
Novopress GmbH Pressen und Presswerkzeuge and Co KG
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 Novopress GmbH Pressen und Presswerkzeuge and Co KG filed Critical Novopress GmbH Pressen und Presswerkzeuge and Co KG
Publication of EP2189247A2 publication Critical patent/EP2189247A2/en
Publication of EP2189247A3 publication Critical patent/EP2189247A3/en
Application granted granted Critical
Publication of EP2189247B1 publication Critical patent/EP2189247B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

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
    • B25B27/00—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for
    • B25B27/02—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same
    • B25B27/10—Hand tools, specially adapted for fitting together or separating parts or objects whether or not involving some deformation, not otherwise provided for for connecting objects by press fit or detaching same inserting fittings into hoses
    • 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
    • B21D39/00—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders
    • B21D39/04—Application of procedures in order to connect objects or parts, e.g. coating with sheet metal otherwise than by plating; Tube expanders of tubes with tubes; of tubes with rods
    • B21D39/046—Connecting tubes to tube-like fittings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/005—Hydraulic driving means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/042—Hand tools for crimping
    • H01R43/0427—Hand tools for crimping fluid actuated hand crimping tools
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
    • H01R43/04—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors for forming connections by deformation, e.g. crimping tool
    • H01R43/042—Hand tools for crimping
    • H01R43/0428—Power-driven hand crimping tools

Definitions

  • hand-held pressing devices which consist of a drive device and an end attached via a coupling adapted to the particular application pressing tool.
  • the drive device is formed electrohydraulically in the present type of such pressing devices.
  • a mains or battery-powered, electric drive motor drives a hydraulic pump, which may be designed as a piston or gear pump.
  • the hydraulic pump acts on an actuating device in the form of a hydraulic motor.
  • such a hydraulic motor is designed as a piston-cylinder unit with a hydraulic piston arranged in a hydraulic piston whose piston rod acts on the pressing tool. During movement of the piston rod, one or more pressing jaws are moved in the pressing tool in the pressing direction.
  • To the hydraulic pump includes a hydraulic reservoir, from which the hydraulic pump sucks hydraulic fluid through its suction side and promotes via its pressure side in the pressure chamber of the piston-cylinder unit.
  • the hydraulic system also includes a connection between the pressure side of the hydraulic motor and the hydraulic reservoir.
  • a pressure relief valve is arranged, which is initially closed during the pressing process and only when reaching a certain maximum pressure, also called cut-off pressure, opens to the hydraulic reservoir.
  • the cut-off pressure is designed so high that in a normal pressing operation opening only takes place when the pressing process is completed, so that the pressing tool has reached its final pressing position.
  • the pressure relief valve can not always open. It can be mechanically blocked in such a way that opening does not succeed. If there is a blockage in the pressure area of the hydraulic system, the manually operated opening of the pressure relief valve is of no use. In both cases, the possibility of manual opening of the pressure relief valve can not prevent that during the pressing process, a well above the cut-off pressure hydraulic pressure builds up, which leads to an overload of parts of the pressing device. This can result in the crimping tool breaking and the broken pieces flying away at high speed and thereby endanger persons, in particular the operator.
  • the invention has for its object to make a drive device for a pressing device of the type described above so that the drive device or the pressing device is better protected against overloading.
  • the basic idea of the invention is thus to provide an emergency valve, which is assigned to the pressure relief valve and only then opens when the overpressure valve does not lead to a pressure relief when the cutoff pressure is reached, for example because a blockage is present or the pressure relief valve is blocked.
  • the emergency valve is set so that the emergency pressure is at least equal to the cut-off. However, it can also be above it, but should still be so low that no overloading of parts of the pressing device takes place. With the help of the emergency valve so the safety of the drive device and thus also the pressing device is substantially increased.
  • the emergency valve may be formed, for example, as a spring-loaded needle valve. This does not exclude that other types of valves, such as a ball valve, comes into question. It should be designed as a check valve.
  • the emergency valve may be arranged in series with the pressure relief valve, for example between pressure relief valve and hydraulic reservoir with its own connection to the hydraulic reservoir. However, a parallel arrangement of pressure relief valve and emergency valve is preferred.
  • the emergency valve is connected via a separate hydraulic system from the hydraulic channel with the pressure chamber of the hydraulic motor. In this way Blockages in the hydraulic system do not affect the function of the emergency valve. This applies a fortiori when the emergency valve is connected to the hydraulic reservoir via a hydraulic channel which is separate from the hydraulic system, so that the emergency valve is not part of the hydraulic system between hydraulic motor, hydraulic pump and hydraulic reservoir. This does not exclude that the emergency valve is installed at a suitable location in the existing hydraulic system.
  • the emergency valve is coupled to a manual operating device, via which the emergency valve can be opened from the outside.
  • a manual operating device via which the emergency valve can be opened from the outside.
  • the manual actuating device has a manual actuating element which projects into the hydraulic reservoir and ends there, wherein the hydraulic reservoir in the region of the manual actuating element has an outer wall of the drive device forms and the outer wall, at least there, ie in the region of the manual actuating element, is designed so elastic that the manual actuating element is movable by acting on the outer wall, for example by pressure, in the opening direction.
  • This training has the advantage that the manual override is completely within the overall hydraulic system, so not - as in the prior art - must be sealed to the outside.
  • the risk of accidental operation is significantly reduced. This does not preclude the hand-operated element from sticking out of the drive device, as happens in the prior art.
  • the manual actuating element can be designed, for example, as an actuating tappet which extends transversely to the longitudinal axis of the pressing device, while the emergency valve has a valve body which extends transversely to the actuating tappet.
  • actuating tappet and valve body may be coupled via an inclined surface, via which the movement of the actuating tappet is converted in its axial direction in an axial movement of the valve body in its opening direction when it is acted upon.
  • both actuating tappet and valve body are each acted upon by a spring, both of which act against the opening direction.
  • the hydraulic reservoir in a conventional manner has an outer wall which surrounds the drive device at least partially in the form of a jacket (see DE 203 03 877 U1 ).
  • the outer wall of the hydraulic reservoir can then be formed by a flexible, in particular elastomeric hose.
  • This design of the hydraulic reservoir is particularly suitable for the design of the manual override, in which the manual control element protrudes into the hydraulic reservoir and ends there.
  • the hydraulic motor can be designed in a manner known per se as a piston-cylinder unit with a hydraulic cylinder and a hydraulic piston.
  • the pressure relief valve in the hydraulic piston and / or in a piston rod of the hydraulic piston is arranged (see. DE 203 03 877 U1 and DE 20 2004 000 215 U1 ).
  • a control valve may also be provided in addition, as it DE 20 2004 000 215 U1 can be taken, the content of which is hereby made the disclosure of the present application.
  • the illustrated pressing apparatus 1 has an elongated drive unit 2, at one end of which a pressing tool 3 is coupled, which is suitable for the compression of press fittings, which serve to connect pipe ends.
  • the drive unit 2 has at the opposite end of the pressing tool 3, an electric motor 4, whose output shaft 5 is coupled to a pump shaft 6 of a total of 7 designated hydraulic pump.
  • the pump shaft 6 is guided in the hydraulic pump 7 in two bearings 8, 9 and has between the two bearings an eccentric 10 which acts via a needle bearing 11 on a radially displaceably guided pump piston 12.
  • the pump piston 12 is moved radially back and forth.
  • the housing of the hydraulic pump 7 is surrounded on the outside by an elastomeric hose 13 which encloses a hydraulic reservoir 14 between them and the outside of the hydraulic pump 7 in a liquid-tight manner.
  • the ends of the tube 13 engage in grooves 15, 16 and are held there from the outside by pushed-over fixing rings 17, 18 in position.
  • the hydraulic pump 7 is flanged in the axial direction on the side facing away from the electric motor 4 to a hydraulic motor in the form of a piston-cylinder unit 19.
  • the piston-cylinder unit 19 has a hydraulic cylinder 20 which is closed on the hydraulic pump side with an end plate 21.
  • a hydraulic piston 22 is guided displaceably. He divides the interior of the hydraulic cylinder 20 in an end plate-side pressure chamber 23 and a rear space 24 a.
  • the hydraulic piston 22 is seated on a piston rod 25 which extends on the side facing away from the end plate 21 in the direction of the pressing tool 3.
  • a hat-shaped sealing element 26 is inserted, which rests on the inside of the piston rod 25 and thus seals the rear space 24.
  • the sealing element 26 also serves to support a piston spring 25 surrounding the coil spring 27, which is supported at the other end on the side remote from the pressure chamber 23 of the hydraulic piston 22.
  • the coil spring 27 is formed as a compression spring and consequently endeavors to move the hydraulic piston 22 in the direction of the end plate 21.
  • the hydraulic piston 22 remote from the end of the Kolbentsange 25 is rigidly connected outside of the rear space 24 with a spreader 28.
  • the spreader 28 has a bearing body 29, are mounted on the two spreader rollers 30, 31 transversely to the axis of the pressing device 1 side by side and freely rotatable in mutual contact.
  • a holder 32 Attached to the back-room-side end of the hydraulic cylinder 20 is a holder 32 which forms two coupling straps 33, 34, which extend in the axial direction of the pressing device 1.
  • the coupling tabs 33, 34 have such a distance from each other that the spreader 28 can move between them.
  • end coupling bores are provided which extend transversely to the longitudinal axis of the pressing device 1 and are aligned. In the area of these coupling bores and between the coupling tabs 33, 34 in a manner known per se (cf., for example FIG. 1 of the EP 1 157 786 A2 or FIG. 1 of the DE 20 2004 000 215 U1 ) two mutually parallel pressing tool tabs, of which in FIG.
  • Both press tool tabs 35 also have coupling holes that are aligned with each other and have the same diameter as the coupling holes in the coupling tabs 33, 34.
  • the connection between the coupling tabs 33, 34 and thus the drive unit 2 is made by a coupling pin 36 through inserted through all four coupling holes and locked for the purpose of its positional fixation is. In this way, the pressing tool 3 is pivotally connected to the drive unit 2.
  • the press tool flaps 35 are of identical construction and are arranged congruently and at a distance. They are connected to each other via two hinge pins 37, 38. In the intermediate space between the press tool tabs 35, mirror-shaped press jaw levers 39, 40 are mounted pivotably on the hinge pins 37, 38.
  • the pressing jaw levers 39, 40 form semicircular pressing jaws 41, 42 at their outer ends, which in the illustrated, closed state of the pressing tool 3 enclose a pressing space 43.
  • a compression spring 44 ensures that the pressing jaw lever 39, 40 take the illustrated closed final pressing position in the idle state.
  • the pressing jaw levers 39, 40 form drive surfaces 45, 46, which interact with the cylindrical surfaces of the spreading rollers 30, 31 during the pressing process.
  • the hydraulic pump 7, ie their limited by the pump piston 12 pressure chamber has not shown here hydraulic channels on the one hand connection to the hydraulic reservoir 14 and the other to the pressure chamber 23 in the piston-cylinder unit 19.
  • a check valve in the hydraulic line to the hydraulic reservoir 14 ensures in that the pump piston 12 aspirates hydraulic oil from the hydraulic reservoir 14 when moving in one direction and the aspirated when moving in the other direction Hydraulic oil transported into the pressure chamber 23.
  • the hydraulic piston 22 and thus also the piston rod 25 and the spreader 28 connected thereto are moved in the direction of the pressing tool 3.
  • a pressure relief valve 47 is formed in the form of a needle valve.
  • the hydraulic piston 22 has a pressure opening 23 open valve opening 48, which serves as a valve seat for a valve body 49 on the inside. This is loaded in the direction of the valve opening 48 by means of a pressure acting on the rear side of the valve body 49 compression spring 50.
  • the compression spring 50 is designed so that it allows a lifting of the valve body 49 only at a certain cut-off pressure in the Druchraum 23.
  • the valve body 49 defines a valve chamber 51, which has a connection to the rear space 24 via a hydraulic channel, not shown here. This in turn is connected via a hydraulic channel, also not shown, with the hydraulic reservoir 14. All above-described hydraulic channels form a total of a hydraulic system. -
  • an emergency valve 52 which is also designed as a needle valve. It has a connection channel 53 direct connection to the pressure chamber 23.
  • the connecting channel 53 narrows into a valve seat insert 54, the inside a valve seat forms, on which a valve needle 55 sealingly abuts.
  • the valve needle 55 is loaded with a compression spring 56.
  • This compression spring 56 is designed so that the valve needle 55 only lifts off from the valve seat insert 54 and thus the emergency valve 52 opens when the pressure in the pressure chamber 23 has reached a value which is at least equal to the cut-off, at which the pressure relief valve 47 at normal function opens, but can also lie about it.
  • the valve chamber of the emergency valve 52 has a channel, not shown here, connection to the hydraulic reservoir 14, so that the hydraulic fluid in the pressure chamber 23 can flow into the hydraulic reservoir 14 when opening the emergency valve 50.
  • a manual override device 57 is provided, with the aid of which it is possible to effect an opening of the emergency valve 52 by external action.
  • the manual actuation device 57 has an actuation tappet 58, which is displaceably guided transversely to the axial extension of the valve needle 55 and ends near the tube 13 within the hydraulic reservoir 14.
  • actuation tappet 58 is displaceably guided transversely to the axial extension of the valve needle 55 and ends near the tube 13 within the hydraulic reservoir 14.
  • a transverse pin 60 passing through the actuating tappet 58 prevents rotation of the actuating tappet 58 and forms a stop for the starting position.
  • valve needle 55 At the valve needle end of the actuating plunger 58 is penetrated by the valve needle 55 and forms there Sloping surface 61, on which abuts a contact surface 62 of the valve needle 55. Due to this coupling, the valve needle 55 is lifted from the valve seat insert 54 against the action of the compression spring 56 when the actuating plunger 58 is moved by applying pressure to the hose 13 in the direction of the valve needle 55. Independently of this, the coupling between actuation tappet 58 and valve needle 55 allows the valve needle 55 to move freely in the opening direction, so that the actuation tappet 58 has no influence on the automatic opening behavior of the emergency valve 52.
  • the pressing device 1 is attached to the press fitting after previously compressed the two pressing jaw lever 39, 40 by hand to the spreader 28 adjacent ends against the action of the compression spring 44 and thus the pressing jaws 44 are removed from each other so that the end a mouth-like opening results.
  • the pressing tool 3 can then be applied radially to the intended location of the press fitting, wherein the pressing jaws 41, 42 initially come to rest on the press fitting and accordingly the drive surfaces 45, 46 are approximated to each other.
  • the electric motor 4 is set in motion with the result that the hydraulic pump 7 sucks hydraulic fluid from the hydraulic reservoir 14 and promotes into the pressure chamber 23.
  • the lateral surfaces of the spreading rollers 30, 31 on the drive surfaces 45, 46 of the pressing jaw lever 39, 40 to the plant and spread them apart gradually.
  • the pressing jaws 41, 42 approach each other and thus ensure a compression of the press fitting radially inward. This continues until the pressing jaws 41, 42 come into mutual contact, so reach their final pressing position. In the process, the pressure in the pressure space 23 increases successively.
  • the pressure in the pressure chamber 23 increases as the electric motor 4 and thus the hydraulic pump 7 continues beyond the cut-off pressure. If the pressure then reaches the emergency pressure, the emergency valve 52 opens by lifting the valve needle 55 from the valve seat insert 54 and then leads to a Drukkentlastung the pressure chamber 23, because the hydraulic oil in the pressure chamber 23 now via the connecting channel 53 and the connection of the emergency valve, not shown here 52 can flow to the hydraulic reservoir 14. About the manual override 57 can be effected at any time and independent of the pressure in the pressure chamber 23, a pressure relief throughout the hydraulic system.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Safety Valves (AREA)
  • Press Drives And Press Lines (AREA)

Description

Die Erfindung betrifft eine handführbare Antriebseinrichtung für ein Pressgerät mit folgenden Merkmalen:

  1. a) die Antriebseinrichtung hat einen Antriebsmotor;
  2. b) der Antriebsmotor treibt eine Hydraulikpumpe an;
  3. c) die Hydraulikpumpe ist über ein Hydrauliksystem mit einem Hydraulikmotor verbunden;
  4. d) die Antriebseinrichtung weist eine Kupplung für die Anbringung eines Presswerkzeugs zum Verpressen von Werkstücken auf;
  5. e) der Hydraulikmotor ist mit einer Betätigungseinrichtung zur Betätigung des Presswerkzeugs gekoppelt;
  6. f) der Hydraulikmotor ist über das Hydrauliksystem mit einem Hydraulikreservoir verbunden;
  7. g) in dem Hydrauliksystem befindet sich zumindest ein Überdruckventil;
  8. h) das Überdruckventil ist derart ausgelegt, dass es bei Erreichen eines bestimmten Abschaltdruckes im Hydraulikmotor die Verbindung zu dem Hydraulikreservoir öffnet;
  9. i) der Hydraulikmotor weist eine Rückstelleinrichtung auf, die den Hydraulikmotor nach Öffnen des Überdruckventils in seine Ausgangsstellung zurückbewegt und hierdurch Hydraulikflüssigkeit aus dem Hydraulikmotor in das Hydraulikreservoir befördert.
The invention relates to a handleable drive device for a pressing device with the following features:
  1. a) the drive device has a drive motor;
  2. b) the drive motor drives a hydraulic pump;
  3. c) the hydraulic pump is connected via a hydraulic system with a hydraulic motor;
  4. d) the drive device has a coupling for the attachment of a pressing tool for pressing workpieces;
  5. e) the hydraulic motor is coupled to an actuating device for actuating the pressing tool;
  6. f) the hydraulic motor is connected via the hydraulic system to a hydraulic reservoir;
  7. g) in the hydraulic system is at least one pressure relief valve;
  8. h) the pressure relief valve is designed such that it opens the connection to the hydraulic reservoir upon reaching a certain cut-off pressure in the hydraulic motor;
  9. i) the hydraulic motor has a return device, which moves the hydraulic motor after opening the pressure relief valve in its initial position and thereby conveyed hydraulic fluid from the hydraulic motor into the hydraulic reservoir.

Zur Verbindung von Rohrleitungen mittels Pressfittings und für die Anbringung von Kabelschuhen an Elektroleitungen sind handführbare Pressgeräte bekannt, die aus einer Antriebseinrichtung und einem endseitig über eine Kupplung angebrachten, an den jeweiligen Verwendungszweck angepassten Presswerkzeug bestehen. Die Antriebseinrichtung ist bei der vorliegenden Gattung solcher Pressgeräte elektrohydraulisch ausgebildet. Dabei treibt ein netz- oder batteriegespeister, elektrischer Antriebsmotor einen Hydraulikpumpe an, die als Kolben- oder Zahnradpumpe ausgebildet sein kann. Die Hydraulikpumpe wirkt auf eine Betätigungseinrichtung in Form eines Hydraulikmotors. In der Regel ist ein solcher Hydraulikmotor als Kolben-Zylinder-Einheit mit einem in einem Hydraulikzylinder angeordneten Hydraulikkolben ausgebildet, dessen Kolbenstange auf das Presswerkzeug einwirkt. Bei Bewegung der Kolbenstange werden eine oder mehrere Pressbacken in dem Presswerkzeug in Pressrichtung bewegt. Bei dieser Art Antrieb wird also die Drehbewegung eines Antriebsmotors hydraulisch in eine Linearbewegung der Kolbenstange umgesetzt, um für eine Pressbewegung des Presswerkzeuges zu sorgen. Beispiele solcher Pressgeräte finden sich in US 5,125,324 A , DE 203 03 877 U1 , DE 20 2004 000 215 U1 und WO 2005/053909 A1 .For connecting pipes by means of press fittings and for the attachment of cable lugs to electric cables hand-held pressing devices are known, which consist of a drive device and an end attached via a coupling adapted to the particular application pressing tool. The drive device is formed electrohydraulically in the present type of such pressing devices. In this case, a mains or battery-powered, electric drive motor drives a hydraulic pump, which may be designed as a piston or gear pump. The hydraulic pump acts on an actuating device in the form of a hydraulic motor. As a rule, such a hydraulic motor is designed as a piston-cylinder unit with a hydraulic piston arranged in a hydraulic piston whose piston rod acts on the pressing tool. During movement of the piston rod, one or more pressing jaws are moved in the pressing tool in the pressing direction. In this type of drive Thus, the rotational movement of a drive motor is hydraulically converted into a linear movement of the piston rod to provide a pressing movement of the pressing tool. Examples of such pressing devices can be found in US 5,125,324 A . DE 203 03 877 U1 . DE 20 2004 000 215 U1 and WO 2005/053909 A1 ,

Zu der Hydraulikpumpe gehört ein Hydraulikreservoir, aus dem die Hydraulikpumpe Hydraulikflüssigkeit über ihre Saugseite ansaugt und über ihre Druckseite in den Druckraum der Kolben-Zylinder-Einheit fördert. Zu dem Hydrauliksystem gehört auch eine Verbindung zwischen der Druckseite des Hydraulikmotors und dem Hydraulikreservoir.To the hydraulic pump includes a hydraulic reservoir, from which the hydraulic pump sucks hydraulic fluid through its suction side and promotes via its pressure side in the pressure chamber of the piston-cylinder unit. The hydraulic system also includes a connection between the pressure side of the hydraulic motor and the hydraulic reservoir.

In dem Hydrauliksystem zwischen Hydraulikmotor und Hydraulikreservoir ist ein Überdruckventil angeordnet, das beim Pressvorgang zunächst geschlossen ist und erst bei Erreichen eines bestimmten Höchstdruckes, auch Abschaltdruck genannt, zum Hydraulikreservoir hin öffnet. Der Abschaltdruck ist so hoch ausgelegt, dass bei einem normalen Pressvorgang ein Öffnen erst stattfindet, wenn der Pressvorgang abgeschlossen ist, also das Presswerkzeug seine Endpressstellung erreicht hat.In the hydraulic system between hydraulic motor and hydraulic reservoir, a pressure relief valve is arranged, which is initially closed during the pressing process and only when reaching a certain maximum pressure, also called cut-off pressure, opens to the hydraulic reservoir. The cut-off pressure is designed so high that in a normal pressing operation opening only takes place when the pressing process is completed, so that the pressing tool has reached its final pressing position.

Mit dem Öffnen des Überdruckventils und ggf. dem Abschalten des Antriebsmotors und damit der Hydraulikpumpe wird der Hydraulikkolben mit einer auf ihn oder die Kolbenstange einwirkenden Rückstellfeder in seine Ausgangsstellung zurückbewegt. Hierdurch wird die in dem Druckraum befindliche Hydraulikflüssigkeit in das Hydraulikreservoir zurückgedrückt.With the opening of the pressure relief valve and possibly the switching off of the drive motor and thus of the hydraulic pump, the hydraulic piston is moved back to its starting position with a return spring acting on it or the piston rod. As a result, the in the pressure chamber hydraulic fluid pushed back into the hydraulic reservoir.

Um z.B. bei Blockade des Überdruckventils oder in Notsituationen eine Druckentlastung des Hydrauliksystems und des Hydraulikmotors bewirken zu können, ist es bei gattungsgemäßen Pressgeräten bekannt, das Überdruckventil mit einer von außen zugänglichen Handbetätigungseinrichtung zu koppeln (vgl. WO 99/19941 A1 ; EP 1 157 786 A2 ; DE 201 20 204 U1 ; EP 1 319 475 A2 ; US2001/0027676 A1 ). Über diese Handbetätigungseinrichtung kann die Bedienungsperson das Überdruckventil unabhängig vom Druck im Hydrauliksystem öffnen, so dass die Hydraulikflüssigkeit durch Rückstellung des Hydraulikkolbens in dem Hydraulikmotor in das Hydraulikreservoir fließen kann.In order to be able to effect a pressure relief of the hydraulic system and the hydraulic motor, for example in blockage of the pressure relief valve or in emergency situations, it is known in generic pressing devices to couple the pressure relief valve with an externally accessible manual override device (see. WO 99/19941 A1 ; EP 1 157 786 A2 ; DE 201 20 204 U1 ; EP 1 319 475 A2 ; US2001 / 0027676 A1 ). About this manual operation, the operator can open the pressure relief valve regardless of the pressure in the hydraulic system, so that the hydraulic fluid can flow into the hydraulic reservoir by resetting the hydraulic piston in the hydraulic motor.

Mit einer solchen Handbetätigungseinrichtung lässt sich das Überdruckventil nicht immer öffnen. Es kann mechanisch derart blockiert sein, dass das Öffnen nicht gelingt. Liegt eine Verstopfung im Druckbereich des Hydrauliksystems vor, nützt die handbetätigte Öffnung des Überdruckventils nichts. In beiden Fällen kann die Möglichkeit der Handöffnung des Überdruckventils nicht verhindern, dass sich beim Pressvorgang ein weit über dem Abschaltdruck liegender Hydraulikdruck aufbaut, der zu einer Überlastung von Teilen des Pressgerätes führt. Dies kann zur Folge haben, dass das Presswerkzeug bricht und die abgebrochenen Teile mit hoher Geschwindigkeit wegfliegen und dabei Personen, insbesondere die Bedienungsperson, gefährden.With such a manual actuator, the pressure relief valve can not always open. It can be mechanically blocked in such a way that opening does not succeed. If there is a blockage in the pressure area of the hydraulic system, the manually operated opening of the pressure relief valve is of no use. In both cases, the possibility of manual opening of the pressure relief valve can not prevent that during the pressing process, a well above the cut-off pressure hydraulic pressure builds up, which leads to an overload of parts of the pressing device. This can result in the crimping tool breaking and the broken pieces flying away at high speed and thereby endanger persons, in particular the operator.

Ein weiterer Nachteil der Handbetätigungseinrichtung besteht darin, dass sie aufgrund ihrer Verbindung mit dem Überdruckventil Einfluss auf die Abschaltgenauigkeit hat, d.h. das Überdruckventil öffnet nicht exakt beim vorbestimmten Abschaltdruck.Another disadvantage of the manual override device is that it has an impact on the shutdown accuracy due to its connection to the relief valve, i. the pressure relief valve does not open exactly at the predetermined switch-off pressure.

Der Erfindung liegt die Aufgabe zugrunde, eine Antriebseinrichtung für ein Pressgerät der vorbeschriebenen Gattung so zu gestalten, dass die Antriebseinrichtung bzw. das Pressgerät besser gegen Überlastung geschützt ist.The invention has for its object to make a drive device for a pressing device of the type described above so that the drive device or the pressing device is better protected against overloading.

Diese Aufgabe wird erfindungsgemäß durch folgende Merkmale gelöst:

  1. a) es ist ein Notfallventil vorgesehen;
  2. b) das Notfallventil hat einerseits Verbindung zur Druckseite des Hydraulikmotors und/oder des Hydrauliksystems und anderseits zum Hydraulikreservoir;
  3. c) das Notfallventil ist derart ausgelegt, dass es bei Erreichen eines zumindest dem Abschaltdruck entsprechenden Notfalldruckes die Verbindung zum Hydraulikreservoir öffnet.
This object is achieved by the following features:
  1. a) an emergency valve is provided;
  2. b) the emergency valve has on the one hand connection to the pressure side of the hydraulic motor and / or the hydraulic system and on the other hand to the hydraulic reservoir;
  3. c) the emergency valve is designed so that it opens the connection to the hydraulic reservoir upon reaching an emergency pressure corresponding at least the cut-off pressure.

Grundgedanke der Erfindung ist es also, ein Notfallventil vorzusehen, das dem Überdruckventil beigeordnet ist und das nur und erst dann öffnet, wenn das Überdruckventil bei Erreichen des Abschaltdruckes nicht zu einer Drukkentlastung führt, beispielsweise weil eine Verstopfung vorliegt oder das Überdruckventil blockiert ist. Dabei ist das Notfallventil so eingestellt, dass der Notfalldruck zumindest gleich dem Abschaltdruck ist. Er kann jedoch auch darüber liegen, sollte jedoch noch so niedrig sein, dass keine Überlastung von Teilen des Pressgerätes stattfindet. Mit Hilfe des Notfallventils wird also die Sicherheit der Antriebseinrichtung und damit auch des Pressgerätes wesentlich erhöht.The basic idea of the invention is thus to provide an emergency valve, which is assigned to the pressure relief valve and only then opens when the overpressure valve does not lead to a pressure relief when the cutoff pressure is reached, for example because a blockage is present or the pressure relief valve is blocked. In this case, the emergency valve is set so that the emergency pressure is at least equal to the cut-off. However, it can also be above it, but should still be so low that no overloading of parts of the pressing device takes place. With the help of the emergency valve so the safety of the drive device and thus also the pressing device is substantially increased.

Das Notfallventil kann beispielsweise als federbelastetes Nadelventil ausgebildet sein. Dies schließt nicht aus, dass auch andere Ventilarten, beispielsweise ein Kugelventil, in Frage kommt. Es sollte als Rückschlagventil ausgestaltet sein.The emergency valve may be formed, for example, as a spring-loaded needle valve. This does not exclude that other types of valves, such as a ball valve, comes into question. It should be designed as a check valve.

Das Notfallventil kann in Reihe zum Überdruckventil angeordnet sein, beispielsweise zwischen Überdruckventil und Hydraulikreservoir mit eigenem Anschluss zum Hydraulikreservoir. Bevorzugt ist jedoch eine parallele Anordnung von Überdruckventil und Notfallventil.The emergency valve may be arranged in series with the pressure relief valve, for example between pressure relief valve and hydraulic reservoir with its own connection to the hydraulic reservoir. However, a parallel arrangement of pressure relief valve and emergency valve is preferred.

In bevorzugter Ausbildung ist das Notfallventil über einen vom Hydrauliksystem separaten Hydraulikkanal mit dem Druckraum des Hydraulikmotors verbunden. Auf diese Weise wirken sich Verstopfungen im Hydrauliksystem nicht auf die Funktion des Notfallventils aus. Dies gilt erst recht, wenn das Notfallventil über einen vom Hydrauliksystem separaten Hydraulikkanal mit dem Hydraulikreservoir verbunden ist, so dass das Notfallventil nicht Teil des Hydrauliksystems zwischen Hydraulikmotor, Hydraulikpumpe und Hydraulikreservoir ist. Dies schließt nicht aus, dass das Notfallventil an geeigneter Stelle im vorhandenen Hydrauliksystem eingebaut wird.In a preferred embodiment, the emergency valve is connected via a separate hydraulic system from the hydraulic channel with the pressure chamber of the hydraulic motor. In this way Blockages in the hydraulic system do not affect the function of the emergency valve. This applies a fortiori when the emergency valve is connected to the hydraulic reservoir via a hydraulic channel which is separate from the hydraulic system, so that the emergency valve is not part of the hydraulic system between hydraulic motor, hydraulic pump and hydraulic reservoir. This does not exclude that the emergency valve is installed at a suitable location in the existing hydraulic system.

In weiterer Ausgestaltung der Erfindung ist vorgesehen, dass das Notfallventil mit einer Handbetätigungseinrichtung gekoppelt ist, über die das Notfallventil von außen öffenbar ist. Auf diese Weise besteht die Möglichkeit, eine Druckentlastung des Hydrauliksystems unabhängig von der Höhe des jeweils gegebenen Druckes und damit auch unabhängig von der Funktion des Überdruckventils vorzunehmen. Dies schließt nicht aus, dass das Überdruckventil statt dessen oder zusätzlich mit einer Handbetätigungseinrichtung, beispielsweise wie sie im vorzitierten Stand der Technik beschrieben ist, versehen wird, um die Drukkentlastung mittels des Überdruckventils durchführen zu können.In a further embodiment of the invention, it is provided that the emergency valve is coupled to a manual operating device, via which the emergency valve can be opened from the outside. In this way, it is possible to make a pressure relief of the hydraulic system, regardless of the level of each given pressure and thus also independent of the function of the pressure relief valve. This does not exclude that the pressure relief valve is provided instead or in addition with a manual override device, for example as described in the cited prior art, to perform the Drukkentlastung means of the pressure relief valve can.

Eine besonders vorteilhafte Ausbildung ergibt sich, wenn die Handbetätigungseinrichtung ein Handbetätigungselement aufweist, das in das Hydraulikreservoir hineinragt und dort endet, wobei das Hydraulikreservoir im Bereich des Handbetätigungselements eine Außenwandung der Antriebseinrichtung bildet und die Außenwandung zumindest dort, d.h. im Bereich des Handbetätigungselements, derart elastisch ausgebildet ist, dass das Handbetätigungselement durch Beaufschlagung der Außenwandung, beispielsweise durch Druckeinwirkung, in Öffnungsrichtung bewegbar ist. Diese Ausbildung hat den Vorzug, dass die Handbetätigungseinrichtung vollständig innerhalb des Gesamt-Hydraulik-systems liegt, also nicht - wie im Stand der Technik - nach außen hin abgedichtet werden muss. Außerdem wird die Gefahr einer versehentlichen Betätigung wesentlich herabgesetzt. Dies schließt nicht aus, das Handbetätigungselement aus der Antriebseinrichtung herausragen zu lassen, wie dies im Stand der Technik geschieht.A particularly advantageous embodiment is obtained if the manual actuating device has a manual actuating element which projects into the hydraulic reservoir and ends there, wherein the hydraulic reservoir in the region of the manual actuating element has an outer wall of the drive device forms and the outer wall, at least there, ie in the region of the manual actuating element, is designed so elastic that the manual actuating element is movable by acting on the outer wall, for example by pressure, in the opening direction. This training has the advantage that the manual override is completely within the overall hydraulic system, so not - as in the prior art - must be sealed to the outside. In addition, the risk of accidental operation is significantly reduced. This does not preclude the hand-operated element from sticking out of the drive device, as happens in the prior art.

Das Handbetätigungselement kann beispielsweise als Betätigungsstößel ausgebildet sein, der sich quer zur Längsachse des Pressgerätes erstreckt, während das Notfallventil einen Ventilkörper aufweist, der sich quer zum Betätigungsstößel erstreckt. Dabei können Betätigungsstößel und Ventilkörper über eine Schrägfläche gekoppelt sein, über die die Bewegung des Betätigungsstößels bei dessen Beaufschlagung in Axialrichtung in einer Axialbewegung des Ventilkörpers in dessen Öffnungsrichtung umgewandelt wird. Zweckmäßigerweise sind dann sowohl Betätigungsstößel als auch Ventilkörper mit jeweils einer Feder beaufschlagt, die beide gegen die Öffnungsrichtung wirken.The manual actuating element can be designed, for example, as an actuating tappet which extends transversely to the longitudinal axis of the pressing device, while the emergency valve has a valve body which extends transversely to the actuating tappet. In this case, actuating tappet and valve body may be coupled via an inclined surface, via which the movement of the actuating tappet is converted in its axial direction in an axial movement of the valve body in its opening direction when it is acted upon. Appropriately, then both actuating tappet and valve body are each acted upon by a spring, both of which act against the opening direction.

Nach einem weiteren Merkmal der Erfindung ist vorgesehen, dass das Hydraulikreservoir in an sich bekannter Weise eine Außenwandung aufweist, der die Antriebseinrichtung zumindest teilweise mantelförmig umgibt (vgl. DE 203 03 877 U1 ). Die Außenwandung des Hydraulikreservoirs kann dann von einem flexiblen, insbesondere elastomeren Schlauch gebildet sein. Diese Ausbildung des Hydraulikreservoirs eignet sich vor allem für die Ausgestaltung der Handbetätigungseinrichtung, bei der das Handbetätigungselement in das Hydraulikreservoir hineinragt und dort endet.According to a further feature of the invention it is provided that the hydraulic reservoir in a conventional manner has an outer wall which surrounds the drive device at least partially in the form of a jacket (see DE 203 03 877 U1 ). The outer wall of the hydraulic reservoir can then be formed by a flexible, in particular elastomeric hose. This design of the hydraulic reservoir is particularly suitable for the design of the manual override, in which the manual control element protrudes into the hydraulic reservoir and ends there.

Der Hydraulikmotor kann in an sich bekannter Weise als Kolben-Zylinder-Einheit mit einem Hydraulikzylinder und einem Hydraulikkolben ausgebildet sein. In diesem Fall hat es sich als vorteilhaft erwiesen, dass das Überdruckventil in dem Hydraulikkolben und/oder in einer Kolbenstange des Hydraulikkolbens angeordnet ist (vgl. DE 203 03 877 U1 und DE 20 2004 000 215 U1 ). Dabei kann auch zusätzlich ein Steuerventil vorgesehen sein, wie es der DE 20 2004 000 215 U1 zu entnehmen ist, deren Inhalt hiermit zum Offenbarungsinhalt der vorliegenden Anmeldung gemacht wird.The hydraulic motor can be designed in a manner known per se as a piston-cylinder unit with a hydraulic cylinder and a hydraulic piston. In this case, it has proved to be advantageous that the pressure relief valve in the hydraulic piston and / or in a piston rod of the hydraulic piston is arranged (see. DE 203 03 877 U1 and DE 20 2004 000 215 U1 ). In this case, a control valve may also be provided in addition, as it DE 20 2004 000 215 U1 can be taken, the content of which is hereby made the disclosure of the present application.

In der Zeichnung ist die Erfindung anhand eines Ausführungsbeispiels näher veranschaulicht. Es zeigen:

Figur 1
einen Längsschnitt durch das erfindungsgemäße Pressgerät zum Verpressen von Pressfittings und
Figur 2
einen Längsschnitt durch einen Teil des Pressgerätes gemäß Figur 1 in einer Ebene, die um die Längsachse des Pressgerätes um 90° verdreht ist.
In the drawing, the invention with reference to an embodiment is illustrated in more detail. Show it:
FIG. 1
a longitudinal section through the pressing device according to the invention for pressing press fittings and
FIG. 2
a longitudinal section through a part of the pressing device according to FIG. 1 in a plane that is rotated by 90 ° about the longitudinal axis of the pressing device.

Das dargestellte Pressgerät 1 weist eine langgestreckte Antriebseinheit 2 auf, an deren einem Ende ein Presswerkzeug 3 angekuppelt ist, das für die Verpressung von Pressfittings geeignet ist, die der Verbindung von Rohrenden dienen.The illustrated pressing apparatus 1 has an elongated drive unit 2, at one end of which a pressing tool 3 is coupled, which is suitable for the compression of press fittings, which serve to connect pipe ends.

Die Antriebseinheit 2 hat an dem dem Presswerkzeug 3 gegenüberliegenden Ende einen Elektromotor 4, dessen Ausgangswelle 5 mit einer Pumpenwelle 6 einer insgesamt mit 7 bezeichneten Hydraulikpumpe gekoppelt ist. Die Pumpenwelle 6 ist in der Hydraulikpumpe 7 in zwei Lagern 8, 9 geführt und hat zwischen den beiden Lagern einen Exenter 10, der über ein Nadellager 11 auf einen radial verschieblich geführten Pumpenkolben 12 wirkt. Bei angetriebener Pumpenwelle 6 wird der Pumpenkolben 12 radial hin- und herbewegt.The drive unit 2 has at the opposite end of the pressing tool 3, an electric motor 4, whose output shaft 5 is coupled to a pump shaft 6 of a total of 7 designated hydraulic pump. The pump shaft 6 is guided in the hydraulic pump 7 in two bearings 8, 9 and has between the two bearings an eccentric 10 which acts via a needle bearing 11 on a radially displaceably guided pump piston 12. When the pump shaft 6 is driven, the pump piston 12 is moved radially back and forth.

Das Gehäuse der Hydraulikpumpe 7 ist außenseitig von einem elastomeren Schlauch 13 umgeben, der zwischen sich und der Außenseite der Hydraulikpumpe 7 ein Hydraulikreservoir 14 flüssigkeitsdicht einschließt. Hierzu fassen die Enden des Schlauchs 13 in Nuten 15, 16 ein und werden dort von außen durch übergeschobene Fixierringe 17, 18 in Position gehalten.The housing of the hydraulic pump 7 is surrounded on the outside by an elastomeric hose 13 which encloses a hydraulic reservoir 14 between them and the outside of the hydraulic pump 7 in a liquid-tight manner. For this purpose, the ends of the tube 13 engage in grooves 15, 16 and are held there from the outside by pushed-over fixing rings 17, 18 in position.

Die Hydraulikpumpe 7 ist in axialer Richtung auf der dem Elektromotor 4 abgewandten Seite an einen Hydraulikmotor in Form einer Kolben-Zylinder-Einheit 19 angeflanscht. Die Kolben-Zylinder-Einheit 19 weist einen Hydraulikzylinder 20 auf, der hydraulikpumpenseitig mit einer Endplatte 21 verschlossen ist. In dem Hydraulikzylinder 20 ist ein Hydraulikkolben 22 verschieblich geführt. Er teilt den Innenraum des Hydraulikzylinders 20 in einen endplattenseitigen Druckraum 23 und einen Rückraum 24 ein.The hydraulic pump 7 is flanged in the axial direction on the side facing away from the electric motor 4 to a hydraulic motor in the form of a piston-cylinder unit 19. The piston-cylinder unit 19 has a hydraulic cylinder 20 which is closed on the hydraulic pump side with an end plate 21. In the hydraulic cylinder 20, a hydraulic piston 22 is guided displaceably. He divides the interior of the hydraulic cylinder 20 in an end plate-side pressure chamber 23 and a rear space 24 a.

Der Hydraulikkolben 22 sitzt auf einer Kolbenstange 25, die sich auf der der Endplatte 21 abgewandten Seite in Richtung auf das Presswerkzeug 3 erstreckt. Am dortigen Ende des Hydraulikkolbens 22 ist ein hutförmiges Dichtungselement 26 eingesetzt, das innenseitig an der Kolbenstange 25 anliegt und so den Rückraum 24 abdichtet. Das Dichtungselement 26 dient zudem der Abstützung einer die Kolbenstange 25 umgebenden Schraubenfeder 27, die sich anderenends an der dem Druckraum 23 abgewandten Seite des Hydraulikkolbens 22 abstützt. Die Schraubenfeder 27 ist als Druckfeder ausgebildet und folglich bestrebt, den Hydraulikkolben 22 in Richtung auf die Endplatte 21 zu bewegen.The hydraulic piston 22 is seated on a piston rod 25 which extends on the side facing away from the end plate 21 in the direction of the pressing tool 3. At the local end of the hydraulic piston 22, a hat-shaped sealing element 26 is inserted, which rests on the inside of the piston rod 25 and thus seals the rear space 24. The sealing element 26 also serves to support a piston spring 25 surrounding the coil spring 27, which is supported at the other end on the side remote from the pressure chamber 23 of the hydraulic piston 22. The coil spring 27 is formed as a compression spring and consequently endeavors to move the hydraulic piston 22 in the direction of the end plate 21.

Das dem Hydraulikkolben 22 abgewandte Ende der Kolbentsange 25 ist außerhalb des Rückraums 24 mit einer Spreizeinrichtung 28 starr verbunden. Die Spreizeinrichtung 28 weist einen Lagerkörper 29 auf, an dem zwei Spreizrollen 30, 31 quer zur Achse des Pressgerätes 1 nebeneinander und in gegenseitigem Kontakt frei drehbar gelagert sind.The hydraulic piston 22 remote from the end of the Kolbentsange 25 is rigidly connected outside of the rear space 24 with a spreader 28. The spreader 28 has a bearing body 29, are mounted on the two spreader rollers 30, 31 transversely to the axis of the pressing device 1 side by side and freely rotatable in mutual contact.

An dem rückraumseitigen Ende des Hydraulikzylinders 20 angebracht ist eine Halterung 32, die zwei Kupplungslaschen 33, 34 ausbildet, welche sich in Achsrichtung des Pressgeräts 1 erstrecken. Die Kupplungslaschen 33, 34 haben einen solchen Abstand zueinander, dass sich die Spreizeinrichtung 28 zwischen ihnen bewegen kann. An den Enden der Kupplungslaschen 33, 34 sind endseitig Kupplungsbohrungen vorgesehen, die sich quer zur Längsachse des Pressgerätes 1 erstrecken und miteinander fluchten. In den Bereich dieser Kupplungsbohrungen und zwischen die Kupplungslaschen 33, 34 hinein fassen in an sich bekannter Weise (vgl. beispielsweise Figur 1 der EP 1 157 786 A2 oder Figur 1 der DE 20 2004 000 215 U1 ) zwei zueinander parallele Presswerkzeuglaschen ein, von denen in Figur 1 nur die hinten liegende Presswerkzeuglasche 35 zu sehen ist. Beide Presswerkzeuglaschen 35 haben ebenfalls Kupplungsbohrungen, die miteinander fluchten und die gleichen Durchmesser haben wie die Kupplungsbohrungen in den Kupplungslaschen 33, 34. Über diese Kupplungsbohrung wird die Verbindung zwischen den Kupplungslaschen 33, 34 und damit der Antriebseinheit 2 durch einen Kupplungsbolzen 36 hergestellt, der durch alle vier Kupplungsbohrungen hindurchgesteckt und zwecks seiner Lagefixierung verriegelt ist. Auf diese Weise ist das Presswerkzeug 3 mit der Antriebseinheit 2 gelenkig verbunden.Attached to the back-room-side end of the hydraulic cylinder 20 is a holder 32 which forms two coupling straps 33, 34, which extend in the axial direction of the pressing device 1. The coupling tabs 33, 34 have such a distance from each other that the spreader 28 can move between them. At the ends of the coupling tabs 33, 34 end coupling bores are provided which extend transversely to the longitudinal axis of the pressing device 1 and are aligned. In the area of these coupling bores and between the coupling tabs 33, 34 in a manner known per se (cf., for example FIG. 1 of the EP 1 157 786 A2 or FIG. 1 of the DE 20 2004 000 215 U1 ) two mutually parallel pressing tool tabs, of which in FIG. 1 only the rear pressing tool tab 35 can be seen. Both press tool tabs 35 also have coupling holes that are aligned with each other and have the same diameter as the coupling holes in the coupling tabs 33, 34. About this coupling hole, the connection between the coupling tabs 33, 34 and thus the drive unit 2 is made by a coupling pin 36 through inserted through all four coupling holes and locked for the purpose of its positional fixation is. In this way, the pressing tool 3 is pivotally connected to the drive unit 2.

Die Presswerkzeuglaschen 35 sind identisch ausgebildet sowie deckungsgleich und beabstandet angeordnet. Sie sind über zwei Gelenkbolzen 37, 38 miteinander verbunden. In dem Zwischenraum zwischen den Presswerkzeuglaschen 35 sind auf den Gelenkbolzen 37, 38 spiegelbildlich ausgebildete Pressbackenhebel 39, 40 schwenkbar gelagert. Die Pressbackenhebel 39, 40 bilden an ihren äußeren Enden halbkreisförmige Pressbacken 41, 42 aus, die in dem dargestellten, geschlossenen Zustand des Presswerkzeuges 3 einen Pressraum 43 einschließen. Eine Druckfeder 44 sorgt dafür, dass die Pressbackenhebel 39, 40 im Ruhezustand die dargestellte geschlossene Endpressstellung einnehmen. An den gegenüberliegenden Enden bilden die Pressbackenhebel 39, 40 Antriebsflächen 45, 46 aus, die beim Pressvorgang mit den Zylinderflächen der Spreizrollen 30, 31 zusammenwirken.The press tool flaps 35 are of identical construction and are arranged congruently and at a distance. They are connected to each other via two hinge pins 37, 38. In the intermediate space between the press tool tabs 35, mirror-shaped press jaw levers 39, 40 are mounted pivotably on the hinge pins 37, 38. The pressing jaw levers 39, 40 form semicircular pressing jaws 41, 42 at their outer ends, which in the illustrated, closed state of the pressing tool 3 enclose a pressing space 43. A compression spring 44 ensures that the pressing jaw lever 39, 40 take the illustrated closed final pressing position in the idle state. At the opposite ends, the pressing jaw levers 39, 40 form drive surfaces 45, 46, which interact with the cylindrical surfaces of the spreading rollers 30, 31 during the pressing process.

Die Hydraulikpumpe 7, d.h. deren durch den Pumpenkolben 12 begrenzte Druckraum hat über hier nicht dargestellte Hydraulikkanäle einerseits Verbindung zu dem Hydraulikreservoir 14 und andererseits zu dem Druckraum 23 in der Kolben-Zylinder-Einheit 19. Ein Rückschlagventil in der Hydraulikleitung zu dem Hydraulikreservoir 14 sorgt dafür, dass der Pumpenkolben 12 bei Bewegung in einer Richtung Hydrauliköl aus dem Hydraulikreservoir 14 ansaugt und bei Bewegung in der anderen Richtung das angesaugte Hydrauliköl in den Druckraum 23 befördert. Hierdurch werden der Hydraulikkolben 22 und damit auch die Kolbenstange 25 und die damit verbundene Spreizeinrichtung 28 in Richtung auf das Presswerkzeug 3 bewegt.The hydraulic pump 7, ie their limited by the pump piston 12 pressure chamber has not shown here hydraulic channels on the one hand connection to the hydraulic reservoir 14 and the other to the pressure chamber 23 in the piston-cylinder unit 19. A check valve in the hydraulic line to the hydraulic reservoir 14 ensures in that the pump piston 12 aspirates hydraulic oil from the hydraulic reservoir 14 when moving in one direction and the aspirated when moving in the other direction Hydraulic oil transported into the pressure chamber 23. As a result, the hydraulic piston 22 and thus also the piston rod 25 and the spreader 28 connected thereto are moved in the direction of the pressing tool 3.

Im Bereich der Verbindung von Hydraulikkolben 22 und Kolbenstange 25 ist ein Überdruckventil 47 in Form eines Nadelventils ausgebildet. Hierzu weist der Hydraulikkolben 22 eine zum Druckraum 23 offene Ventilöffnung 48 auf, die innenseitig als Ventilsitz für einen Ventilkörper 49 dient. Dieser ist in Richtung auf die Ventilöffnung 48 mittels einer die Rückseite des Ventilkörpers 49 beaufschlagenden Druckfeder 50 belastet. Die Druckfeder 50 ist so ausgelegt, dass sie ein Abheben des Ventilkörpers 49 erst bei einem bestimmten Abschaltdruck im Druchraum 23 zulässt. Der Ventilkörper 49 begrenzt einen Ventilraum 51, der über einen hier nicht dargestellten Hydraulikkanal Verbindung zu dem Rückraum 24 hat. Dieser wiederum ist über einen ebenfalls nicht dargestellten Hydraulikkanal mit dem Hydraulikreservoir 14 verbunden. Sämtliche vorbeschriebenen Hydraulikkanäle bilden insgesamt ein Hydrauliksystem. -In the region of the connection of hydraulic piston 22 and piston rod 25, a pressure relief valve 47 is formed in the form of a needle valve. For this purpose, the hydraulic piston 22 has a pressure opening 23 open valve opening 48, which serves as a valve seat for a valve body 49 on the inside. This is loaded in the direction of the valve opening 48 by means of a pressure acting on the rear side of the valve body 49 compression spring 50. The compression spring 50 is designed so that it allows a lifting of the valve body 49 only at a certain cut-off pressure in the Druchraum 23. The valve body 49 defines a valve chamber 51, which has a connection to the rear space 24 via a hydraulic channel, not shown here. This in turn is connected via a hydraulic channel, also not shown, with the hydraulic reservoir 14. All above-described hydraulic channels form a total of a hydraulic system. -

Wie nur aus Figur 2 zu ersehen ist, befindet sich in dem Gehäuse der Hydraulikpumpe 7 ein Notfallventil 52, das ebenfalls als Nadelventil ausgebildet ist. Es hat über einen Verbindungskanal 53 direkte Verbindung zu dem Druckraum 23. Der Verbindungskanal 53 verengt sich in einen Ventilsitzeinsatz 54, der innenseitig einen Ventilsitz ausbildet, an dem eine Ventilnadel 55 abdichtend anliegt. Dazu ist die Ventilnadel 55 mit einer Druckfeder 56 belastet. Diese Druckfeder 56 ist so ausgelegt, dass sich die Ventilnadel 55 nur dann von dem Ventilsitzeinsatz 54 abhebt und somit das Notfallventil 52 öffnet, wenn der Druck im Druckraum 23 einen Wert erreicht hat, der zumindest gleich dem Abschaltdruck ist, bei dem das Überdruckventil 47 bei normaler Funktion öffnet, aber auch darüber liegen kann. Der Ventilraum des Notfallventils 52 hat über einen hier nicht dargestellten Kanal Verbindung zu dem Hydraulikreservoir 14, so dass die im Druckraum 23 befindliche Hydraulikflüssigkeit beim Öffnen des Notfallventils 50 in das Hydraulikreservoir 14 abfließen kann.How only out FIG. 2 can be seen, is located in the housing of the hydraulic pump 7, an emergency valve 52, which is also designed as a needle valve. It has a connection channel 53 direct connection to the pressure chamber 23. The connecting channel 53 narrows into a valve seat insert 54, the inside a valve seat forms, on which a valve needle 55 sealingly abuts. For this purpose, the valve needle 55 is loaded with a compression spring 56. This compression spring 56 is designed so that the valve needle 55 only lifts off from the valve seat insert 54 and thus the emergency valve 52 opens when the pressure in the pressure chamber 23 has reached a value which is at least equal to the cut-off, at which the pressure relief valve 47 at normal function opens, but can also lie about it. The valve chamber of the emergency valve 52 has a channel, not shown here, connection to the hydraulic reservoir 14, so that the hydraulic fluid in the pressure chamber 23 can flow into the hydraulic reservoir 14 when opening the emergency valve 50.

Im hinteren Bereich der Ventilnadel 55 ist eine Handbetätigungseinrichtung 57 vorgesehen, mit deren Hilfe es möglich ist, durch Einwirkung von außen eine Öffnung des Notfallventils 52 zu bewirken. Die Handbetätigungseinrichtung 57 hat hierzu einen Betätigungsstößel 58, der quer zur axialen Erstreckung der Ventilnadel 55 verschieblich geführt ist und innerhalb des Hydraulikreservoirs 14 nahe des Schlauchs 13 endet. Über eine Druckfeder 59 wird er in der gezeigten Ausgangsstellung gehalten. Ein den Betätigungsstößel 58 durchsetzender Querbolzen 60 verhindert eine Verdrehung des Betätigungsstößels 58 und bildet einen Anschlag für die Ausgangsstellung. Am ventilnadelseitigen Ende wird der Betätigungsstößel 58 von der Ventilnadel 55 durchsetzt und bildet dort eine Schrägfläche 61 aus, an der eine Anlagefläche 62 der Ventilnadel 55 anliegt. Aufgrund dieser Kopplung wird die Ventilnadel 55 von dem Ventilsitzeinsatz 54 gegen die Wirkung der Druckfeder 56 abgehoben, wenn der Betätigungsstößel 58 durch Druckausübung auf den Schlauch 13 in Richtung auf die Ventilnadel 55 verschoben wird. Unabhängig davon lässt die Kopplung zwischen Betätigungsstößel 58 und Ventilnadel 55 zu, dass die Ventilnadel 55 sich in Öffnungsrichtung frei bewegen kann, so das der Betätigungsstößel 58 keinen Einfluss auf das automatische Öffnungsverhalten des Notfallventils 52 hat.In the rear region of the valve needle 55, a manual override device 57 is provided, with the aid of which it is possible to effect an opening of the emergency valve 52 by external action. For this purpose, the manual actuation device 57 has an actuation tappet 58, which is displaceably guided transversely to the axial extension of the valve needle 55 and ends near the tube 13 within the hydraulic reservoir 14. About a compression spring 59, it is held in the starting position shown. A transverse pin 60 passing through the actuating tappet 58 prevents rotation of the actuating tappet 58 and forms a stop for the starting position. At the valve needle end of the actuating plunger 58 is penetrated by the valve needle 55 and forms there Sloping surface 61, on which abuts a contact surface 62 of the valve needle 55. Due to this coupling, the valve needle 55 is lifted from the valve seat insert 54 against the action of the compression spring 56 when the actuating plunger 58 is moved by applying pressure to the hose 13 in the direction of the valve needle 55. Independently of this, the coupling between actuation tappet 58 and valve needle 55 allows the valve needle 55 to move freely in the opening direction, so that the actuation tappet 58 has no influence on the automatic opening behavior of the emergency valve 52.

Für einen Pressvorgang wird das Pressgerät 1 an das Pressfitting angesetzt, nachdem zuvor die beiden Pressbackenhebel 39, 40 von Hand an den der Spreizeinrichtung 28 benachbarten Enden gegen die Wirkung der Druckfeder 44 zusammengedrückt und damit die Pressbacken 44 voneinander so entfernt werden, dass sich endseitig eine maulartige Öffnung ergibt. Das Presswerkzeug 3 kann dann radial an die vorgesehene Stelle des Pressfittings angesetzt werden, wobei die Pressbacken 41, 42 zunächst geöffnet zur Anlage am Pressfitting kommen und demgemäß die Antriebsflächen 45, 46 einander angenähert sind.For a pressing operation, the pressing device 1 is attached to the press fitting after previously compressed the two pressing jaw lever 39, 40 by hand to the spreader 28 adjacent ends against the action of the compression spring 44 and thus the pressing jaws 44 are removed from each other so that the end a mouth-like opening results. The pressing tool 3 can then be applied radially to the intended location of the press fitting, wherein the pressing jaws 41, 42 initially come to rest on the press fitting and accordingly the drive surfaces 45, 46 are approximated to each other.

Durch einen hier nicht näher dargestellten Schalter wird der Elektromotor 4 in Gang gesetzt mit der Folge, dass die Hydraulikpumpe 7 Hydraulikflüssigkeit aus dem Hydraulikreservoir 14 ansaugt und in den Druckraum 23 fördert. Dies führt zu einer Translationsbewegung des Hydraulikkolbens 22 und über die Kolbenstange 25 der Spreizeinrichtung 28 in Richtung auf das Presswerkzeug 3. Dabei kommen die Mantelflächen der Spreizrollen 30, 31 an den Antriebsflächen 45, 46 der Pressbackenhebel 39, 40 zur Anlage und spreizen diese nach und nach auseinander. Dies wiederum hat zur Folge, dass sich die Pressbacken 41, 42 einander annähern und so für eine Verpressung des Pressfittings radial nach innen sorgen. Dies setzt sich solange fort, bis die Pressbacken 41, 42 in gegenseitige Anlage kommen, also ihre Endpressstellung erreichen. Dabei erhöht sich sukzessive der Druck im Druckraum 23.By a switch not shown here, the electric motor 4 is set in motion with the result that the hydraulic pump 7 sucks hydraulic fluid from the hydraulic reservoir 14 and promotes into the pressure chamber 23. This leads to a translational movement of the hydraulic piston 22 and the piston rod 25 of the spreading device 28 in the direction of the pressing tool 3. In this case, the lateral surfaces of the spreading rollers 30, 31 on the drive surfaces 45, 46 of the pressing jaw lever 39, 40 to the plant and spread them apart gradually. This in turn has the consequence that the pressing jaws 41, 42 approach each other and thus ensure a compression of the press fitting radially inward. This continues until the pressing jaws 41, 42 come into mutual contact, so reach their final pressing position. In the process, the pressure in the pressure space 23 increases successively.

Auch nach Erreichen der Entpressstellung steigt der Druck im Druckraum 23 noch solange, bis der vorbestimmte Abschaltdruck erreicht ist, bei dem das Überdruckventil 47 durch Abheben des Ventilkörpers 49 von der Ventilöffnung 48 öffnet. Die zunächst auf den Querschnittventilöffnung 48 begrenzte Druckwirkung erfasst nun schlagartig die gesamte Fläche des wesentlich größeren Ventilkörpers 49. Die Hydraulikflüssigkeit kann jetzt in den Rückraum 24 und von dort in das Hydraulikreservoir 14 fließen.Even after reaching the Entpressstellung the pressure in the pressure chamber 23 still increases until the predetermined cut-off pressure is reached at which the pressure relief valve 47 opens by lifting the valve body 49 of the valve port 48. The initially limited to the cross-sectional valve opening 48 pressure effect now detected abruptly the entire surface of the much larger valve body 49. The hydraulic fluid can now flow into the rear chamber 24 and from there into the hydraulic reservoir 14.

Danach schaltet die Bedienungsperson den Elektromotor 4 ab, so dass der Hydraulikumlauf unterbrochen wird. Die Schraubenfeder 27 drückt dann den Hydraulikkolben 22 wieder in Richtung auf die Endplatte 21 zurück. Dabei wird in dem Druckraum 23 ein Druck erzeugt, der ausreicht, um das Überdruckventil 47 während der gesamten Rückbewegung des Hydraulikkolbens 22 offen zu halten, bis der Hydraulikkolben 22 die in den Figuren dargestellte Ausgangsstellung wieder erreicht hat. Dann schließt das Überdruckventil 47.Thereafter, the operator turns off the electric motor 4, so that the hydraulic circulation is interrupted. The coil spring 27 then pushes the hydraulic piston 22 back towards the end plate 21. In this case, a pressure is generated in the pressure chamber 23, which is sufficient to keep the pressure relief valve 47 open during the entire return movement of the hydraulic piston 22 until the hydraulic piston 22 has reached the initial position shown in the figures again. Then the pressure relief valve 47 closes.

Öffnet das Überdruckventil 47 bei Erreichen des Abschaltdruckes nicht, beispielsweise weil es mechanisch blokkiert ist oder eine Verstopfung vorliegt, erhöht sich der Druck im Druckraum 23 bei Weiterlaufen des Elektromotors 4 und damit der Hydraulikpumpe 7 über den Abschaltdruck hinaus. Erreicht der Druck dann den Notfalldruck, öffnet das Notfallventil 52 durch Abheben der Ventilnadel 55 von dem Ventilsitzeinsatz 54 und führt dann zu einer Drukkentlastung des Druckraums 23, weil das im Druckraum 23 befindliche Hydrauliköl nunmehr über den Verbindungskanal 53 und die hier nicht dargestellte Verbindung des Notfallventils 52 zu dem Hydraulikreservoir 14 abfließen kann. Über die Handbetätigungseinrichtung 57 kann jederzeit und unabhängig von dem Druck im Druckraum 23 eine Druckentlastung im gesamten Hydrauliksystem bewirkt werden.Does not open the pressure relief valve 47 when reaching the cut-off, for example, because it is mechanically blocked or there is a blockage, the pressure in the pressure chamber 23 increases as the electric motor 4 and thus the hydraulic pump 7 continues beyond the cut-off pressure. If the pressure then reaches the emergency pressure, the emergency valve 52 opens by lifting the valve needle 55 from the valve seat insert 54 and then leads to a Drukkentlastung the pressure chamber 23, because the hydraulic oil in the pressure chamber 23 now via the connecting channel 53 and the connection of the emergency valve, not shown here 52 can flow to the hydraulic reservoir 14. About the manual override 57 can be effected at any time and independent of the pressure in the pressure chamber 23, a pressure relief throughout the hydraulic system.

Claims (14)

  1. A hand-held drive device (2) for a press device (1), comprising the following features:
    a) the drive device (2) comprises a drive motor (4);
    b) the drive motor (4) drives a hydraulic pump (7);
    c) the hydraulic pump (7) is connected with a hydraulic motor (19) via a hydraulic system;
    d) the drive device (2) comprises a coupling (32) for attaching a press tool (3) for pressing work pieces;
    e) the hydraulic motor (19) is coupled with an actuator means (28) for actuating the press tool (3);
    f) the hydraulic motor (19) is connected with a hydraulic reservoir (14) via the hydraulic system;
    g) at least one pressure relief valve (47) is located in the hydraulic system;
    h) the pressure relief valve (47) is configured such that opens the connection to the hydraulic reservoir (14) when a defined cut-off pressure is reached in the hydraulic motor (19);
    i) the hydraulic motor (19) comprises a return means (27) that moves the hydraulic motor (19) back to its initial position after the pressure relief valve (47) has been opened, and thereby conveys hydraulic liquid from the hydraulic motor (19) into the hydraulic reservoir (14);
    characterized by the following features:
    j) an emergency valve (52) is provided that is arranged in parallel with the pressure relief valve (47);
    k) the emergency valve (52) is in communication with the pressure side of the hydraulic motor (19) and/or the hydraulic system, on the one hand, and the hydraulic reservoir (14), on the other hand;
    l) the emergency valve (52) is configured such that it opens the connection to the hydraulic reservoir (14) when an emergency pressure is reached that corresponds to at least the cut-off pressure.
  2. The drive device of claim 1, characterized in that the emergency pressure is higher than the cut-off pressure.
  3. The drive device of claim 1 or 2, characterized in that the emergency valve (52) is configured as a non-return valve and/or a spring-loaded needle valve.
  4. The drive device of one of claims 1 to 3, characterized in that the emergency valve (52) is in communication with the pressure chamber (23) of the hydraulic motor (19) via a connecting duct (53) that is separate from the hydraulic system and/or with the hydraulic reservoir (14) via a connecting duct that is separate from the hydraulic system.
  5. The drive device of one of claims 1 to 4, characterized in that the emergency valve (52) is coupled to a manual actuation means (57) via which the emergency valve (52) can be opened from outside.
  6. The drive device of claim 5, characterized in that manual actuation means (57) comprises a manual actuation element (58) protruding into the hydraulic reservoir (14) and ending there, the hydraulic reservoir (14) forming an outer wall (13) of the drive device (2) in the region of the manual actuation element (58) and the outer wall (13) is elastic at least in that region, such that the manual actuation element (58) can be moved in the opening direction by exerting force on the outer wall (13).
  7. The drive device of claim 5, characterized in that the manual actuation means comprises a manual actuation element that protrudes from the drive device.
  8. The drive device of claim 6 or 7, characterized in that the manual actuation element is configured as a actuating plunger (58) extending transversely to the longitudinal axis of the press device (1), the emergency valve (52) in particular comprising a valve body (55) extending transversely to the actuation plunger (58).
  9. The drive device of claims 7 and 8, characterized in that the actuation plunger (58) and the valve body (55) are coupled via an inclined surface (61) via which the movement of the actuation plunger (58) is converted into an axial movement of the valve body (55) in the opening direction thereof, when force is exerted on the plunger in the axial direction.
  10. The drive device of claim 8 or 9, characterized in that the actuation plunger (58) and the valve body (55) are loaded by springs (56, 59) of their own.
  11. The drive device of one of claims 1 to 10, characterized in that the hydraulic reservoir (14) has an outer wall (13) that surrounds the drive device (2) at least partly in a shell-like manner.
  12. The drive device of claim 11, characterized in that the outer wall of the hydraulic reservoir (14) is formed by a flexible hose (13).
  13. The drive device of one of claims 1 to 12, characterized in that the hydraulic motor is configured as a piston-cylinder unit (19) with a hydraulic cylinder (20) and a hydraulic piston (22), in particular in that the pressure relief valve (47) is arranged in the hydraulic piston and/or in a piston rod (25) of the hydraulic piston (22).
  14. A press device (1) with a drive device (2) and a press tool (3) for pressing work pieces, which is coupled with the drive device (2), characterized in that the drive device is configured as defined in one of claims 1 to 13.
EP20090014524 2008-11-24 2009-11-20 Drive device for a press device and press device with such a drive device Active EP2189247B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE202008015574U DE202008015574U1 (en) 2008-11-24 2008-11-24 Drive device for a pressing device and pressing device with such a drive device

Publications (3)

Publication Number Publication Date
EP2189247A2 EP2189247A2 (en) 2010-05-26
EP2189247A3 EP2189247A3 (en) 2011-04-20
EP2189247B1 true EP2189247B1 (en) 2013-01-09

Family

ID=41462011

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20090014524 Active EP2189247B1 (en) 2008-11-24 2009-11-20 Drive device for a press device and press device with such a drive device

Country Status (3)

Country Link
EP (1) EP2189247B1 (en)
DE (1) DE202008015574U1 (en)
HK (1) HK1144410A1 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2796245B1 (en) * 2013-04-23 2016-07-27 Geberit International AG Pressing tool
EP4129576B1 (en) * 2018-05-18 2024-04-17 Gustav Klauke GmbH Tool with a hydraulic cylinder such as a pliers or a press
CN112428218B (en) * 2020-11-23 2024-01-09 华南理工大学 Manual gear pump shaft sleeve press-fitting device and press-fitting method

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB947170A (en) * 1960-05-11 1964-01-22 Bwg Bergwerk Walzwerk A relief valve unit
US5125324A (en) 1988-02-10 1992-06-30 Daia Industry Co. Ltd. Portable hydraulically operated device incorporating automatic drain valve
DE19535691C1 (en) * 1995-09-26 1997-01-23 Rothenberger Werkzeuge Masch Hydraulically driven hand tool
EP1019981B1 (en) 1997-10-10 2005-01-05 Robinson Nugent, Inc. Module header apparatus
US6276186B1 (en) * 1997-10-15 2001-08-21 Gustav Klauke Gmbh Hydraulic pressing device and method for operating the same
EP1157786B1 (en) 2000-05-25 2006-12-13 Von Arx Ag Press tool for crimping connection elements
DE20120204U1 (en) 2001-12-13 2003-04-17 Klauke Gmbh Gustav Hydraulic pressing device comprises a hydraulic pump, a moving part, a fixed part, and a non-return valve acting as an over pressure valve
DE20303877U1 (en) 2003-03-10 2003-05-08 Novopress Gmbh Hand-guided hydraulic press cylinder forms part of hydraulic reservoir
CN100423902C (en) * 2003-12-04 2008-10-08 沃恩阿克斯公开股份有限公司 Electrically operated pressing tool
DE202004000215U1 (en) 2004-01-08 2004-04-01 Novopress Gmbh Pressen Und Presswerkzeuge & Co Kg Hand-held press tool appliance for connection of pipes etc. has regulating valve which remains closed when hydraulic pump fails and system pressure is below switch-off pressure
US20050235730A1 (en) * 2004-04-26 2005-10-27 Brailovskiy Aleksandr M Closed circuit hydraulic compression device with stroke-consistent pump intake
DE202006001889U1 (en) * 2006-02-03 2007-03-08 Novopress Gmbh Pressen Und Presswerkzeuge & Co. Kg Drive unit e.g. for press equipment, has motor and attached hydraulic unit which has piston cylinder unit with electric motor propels hydraulic pump having reservoir for hydraulic fluid and connected to piston cylinder unit

Also Published As

Publication number Publication date
HK1144410A1 (en) 2011-02-18
DE202008015574U1 (en) 2009-12-31
EP2189247A2 (en) 2010-05-26
EP2189247A3 (en) 2011-04-20

Similar Documents

Publication Publication Date Title
EP3416783B1 (en) Device and method for transmitting a mechanical force for driving a pressing device for press fittings
EP1247599A1 (en) Drive unit for inserting tool
EP3731997A1 (en) Hydraulic tool for a pulling and/or pressing device
EP2189247B1 (en) Drive device for a press device and press device with such a drive device
EP2228177B1 (en) Handheld drive device for a press device and method for controlling a handheld drive device for a press device
EP2511023B1 (en) Hydraulically operated setting device with a hydraulic aggregate and a joining method for connecting at least two components
CH699346B1 (en) Drive unit for a presser.
DE102014019574B3 (en) Fluid powered drive
DE202004000215U1 (en) Hand-held press tool appliance for connection of pipes etc. has regulating valve which remains closed when hydraulic pump fails and system pressure is below switch-off pressure
WO2010084043A1 (en) Hydraulic drive device having two pressure chambers and method for operating a hydraulic drive device having two pressure chambers
EP2643125B1 (en) Electro-hydraulic pressing device
EP2228178B1 (en) Handheld drive device for a press device and method for controlling a handheld drive device for a press device
DE102016219220B4 (en) Hydraulic drive
EP2902153A1 (en) Plieres
DE102007005837B4 (en) Drive unit for a pressing device
EP3939746B1 (en) Press apparatus with fuse
EP2286936B1 (en) Pressing tool
DE10229276A1 (en) Device for overload protection in a press
DE202013104109U1 (en) Hydraulic tool and hydraulically actuated tool holder
EP1004786A2 (en) Start-up control for controlling an hydraulic piston-cylinder unit
EP2749378B1 (en) Tool for axially pressing fittings
EP2550461A1 (en) Device for locking an axially movable component of a hydraulic system
DE3242979C2 (en) Gate valve for lump-shaped bulk goods
DE102013206128B4 (en) Drive device for a hydraulic pressing tool
WO2024056545A1 (en) Pneumohydraulic pressure intensifier

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

REG Reference to a national code

Ref country code: HK

Ref legal event code: DE

Ref document number: 1144410

Country of ref document: HK

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

AX Request for extension of the european patent

Extension state: AL BA RS

RIC1 Information provided on ipc code assigned before grant

Ipc: H01R 43/042 20060101ALI20110314BHEP

Ipc: B25F 5/00 20060101ALI20110314BHEP

Ipc: F15B 15/20 20060101ALI20110314BHEP

Ipc: B21D 39/04 20060101ALI20110314BHEP

Ipc: B25B 27/10 20060101AFI20100209BHEP

17P Request for examination filed

Effective date: 20111012

GRAC Information related to communication of intention to grant a patent modified

Free format text: ORIGINAL CODE: EPIDOSCIGR1

RIC1 Information provided on ipc code assigned before grant

Ipc: B25F 5/00 20060101ALI20120420BHEP

Ipc: B21D 39/04 20060101ALI20120420BHEP

Ipc: H01R 43/042 20060101ALI20120420BHEP

Ipc: B25B 27/10 20060101AFI20120420BHEP

Ipc: F15B 15/20 20060101ALI20120420BHEP

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO SE SI SK SM TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 592455

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130115

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502009005938

Country of ref document: DE

Effective date: 20130314

REG Reference to a national code

Ref country code: CH

Ref legal event code: NV

Representative=s name: ISLER AND PEDRAZZINI AG, CH

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

REG Reference to a national code

Ref country code: SK

Ref legal event code: T3

Ref document number: E 13735

Country of ref document: SK

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20130109

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130409

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130509

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130409

Ref country code: ES

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130420

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: GR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130410

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130509

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

REG Reference to a national code

Ref country code: HK

Ref legal event code: GR

Ref document number: 1144410

Country of ref document: HK

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: DK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: RO

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

26N No opposition filed

Effective date: 20131010

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502009005938

Country of ref document: DE

Effective date: 20131010

BERE Be: lapsed

Owner name: NOVOPRESS G.M.B.H. PRESSEN UND PRESSWERKZEUGE & C

Effective date: 20131130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20140731

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131130

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131202

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SM

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LU

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20131120

Ref country code: MK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20091120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130109

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 592455

Country of ref document: AT

Kind code of ref document: T

Effective date: 20141120

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20141120

P01 Opt-out of the competence of the unified patent court (upc) registered

Effective date: 20230530

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SK

Payment date: 20231113

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20231123

Year of fee payment: 15

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20231123

Year of fee payment: 15

Ref country code: IT

Payment date: 20231130

Year of fee payment: 15

Ref country code: DE

Payment date: 20231129

Year of fee payment: 15

Ref country code: CZ

Payment date: 20231108

Year of fee payment: 15

Ref country code: CH

Payment date: 20231201

Year of fee payment: 15