EP0612378B1 - Electrohydraulic machine - Google Patents

Electrohydraulic machine Download PDF

Info

Publication number
EP0612378B1
EP0612378B1 EP92922852A EP92922852A EP0612378B1 EP 0612378 B1 EP0612378 B1 EP 0612378B1 EP 92922852 A EP92922852 A EP 92922852A EP 92922852 A EP92922852 A EP 92922852A EP 0612378 B1 EP0612378 B1 EP 0612378B1
Authority
EP
European Patent Office
Prior art keywords
centrifugal pump
piston
cylinder
shaft
piston rod
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP92922852A
Other languages
German (de)
French (fr)
Other versions
EP0612378A1 (en
Inventor
Bernhard Sasse
Peter Zimmermann
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.)
ELEKTRO-MECHANIK GMBH
Original Assignee
ELEKTRO-MECHANIK GmbH
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
Priority to DE19914137103 priority Critical patent/DE4137103C2/en
Priority to DE4137103 priority
Application filed by ELEKTRO-MECHANIK GmbH filed Critical ELEKTRO-MECHANIK GmbH
Priority to PCT/EP1992/002486 priority patent/WO1993010361A1/en
Publication of EP0612378A1 publication Critical patent/EP0612378A1/en
Application granted granted Critical
Publication of EP0612378B1 publication Critical patent/EP0612378B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B15/00Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
    • F15B15/18Combined units comprising both motor and pump

Abstract

An electrohydraulic machine for generating a force on a vertically movable piston rod (5) linked to the piston (4) of a cylinder (3) has a first centrifugal pump (17, 18) arranged in the part of the cylinder (3) opposite to the piston rod (5) and linked by a shaft (15) to an electric motor (2), as well as a housing for the cylinder and centrifugal pump that delimits a reservoir for the working fluid. A second centrifugal pump (18, 19) is arranged underneath the first centrifugal pump (17, 18) and both centrifugal pumps (17, 19; 18, 19) are in communication with the reservoir (14) through a duct (21, 22). The cylinder chamber (6) is closed above the piston (4) in relation to the reservoir (14) and is linked to the second centrifugal pump (18, 19) by means of a pressure line (24). When the electric motor (2) turns in a predetermined direction of rotation, the first centrifugal pump (17, 19) is driven by the shaft (15) and when it turns in the opposite direction of rotation the second centrifugal pump (18, 19) is driven by the shaft (15), whereas, in each case, the other centrifugal pump runs freely, so that the piston (4) may be moved both upwards and downwards.

Description

  • The invention relates to an electrohydraulic device for generating a force which is present on a movable piston rod connected to the piston of a cylinder, with a housing having a first centrifugal pump which is arranged on that part of the cylinder which is remote from the piston rod and which is connected to an electric motor via a shaft for the cylinder and the centrifugal pump, which delimits a storage space intended for operating fluid and has bushings for the shaft and the piston rod, the operating fluid being transferred from a cylinder space above the piston to a cylinder space below the piston or via a pressure line depending on the direction of rotation of the electric motor is pumped in the reverse direction, whereby the piston is moved as a result of the acting pressure and generates forces on the piston rod.
  • Such a hydraulic device is known from DE-GM 16 90 019. This device has a horizontally arranged impeller driven by an electric motor with guide vanes. In addition, a valve body is arranged above the impeller, which, depending on the direction of rotation of the electric motor, is pivoted into one of two fixed positions by the tangential forces of the operating fluid; this specifies flow directions for the operating fluid, namely that in one position the operating fluid is pumped from an area above the piston to an area below the piston, and in the other position, with the motor rotating in the opposite direction, the operating fluid flows in the opposite direction . Depending on the direction of flow, the piston is either moved up or down. The disadvantage is that the manufacture of the valve body requires a very complex and precise work so that it reliably specifies the direction of flow.
  • From DE-PS 842 440 an electro-hydraulic adjustment device with a motor and a pump is also known. In order to raise a piston provided with a piston rod, operating fluid is pumped from a cylinder open to the space above the piston into a pressure space below the piston. This moves the piston upwards hydraulically.
    After the engine has been switched off, tensioned counter springs or raised counterweights push the piston back into its lower starting position. A disadvantage of this known device is that it only generates an upward pressure force on one side. When the engine is switched off and the transition from the upper end position to the lower end position, the device itself does not generate any force, but the downward piston movement takes place due to a force acting on the piston rod from the outside.
  • The invention has for its object to provide an electrohydraulic device that generates not only an upward pressure force on the piston rod, but also a downward force, whereby it is as easy to manufacture.
  • This object is achieved according to the invention in that a second centrifugal pump is provided below the first centrifugal pump, that both centrifugal pumps are connected to the storage space via a feedthrough, that the cylinder space above the piston is closed with respect to the storage space, in a predetermined direction of rotation the first centrifugal pump of the electric motor and, in the opposite direction of rotation, the second centrifugal pump is driven via the shaft while the other centrifugal pump is running freely, and that when the second centrifugal pump is operating, the operating fluid is conveyed via the pressure line into the cylinder space above the piston and the piston as a result of the acting pressure is moved down, whereby the piston rod experiences a downward pulling force.
  • An alternative solution is that a second centrifugal pump is provided on the shaft below the first centrifugal pump, which is connected on the one hand to the first centrifugal pump and on the other hand to the storage space, that the cylinder is above the Piston is open to the storage space and the surface of the operating liquid is above the cylinder, that in a predetermined direction of rotation of the electric motor, the first centrifugal pump and in the opposite direction of rotation, the second centrifugal pump is driven via the shaft while the other centrifugal pump is running freely, and that when the second centrifugal pump is operating, the operating fluid is conveyed into the cylinder space above the piston and the piston is moved downward as a result of the pressure acting on it, as a result of which the piston rod experiences a downward pulling force.
  • This electrohydraulic device generates a lifting and pulling force depending on the direction of rotation of the motor. With a given direction of rotation of the motor, one of the two centrifugal pumps is driven while the other centrifugal pump is running freely. Depending on the direction of rotation of the motor, the operating fluid is conveyed below or above the piston, thus generating an upward or downward pressure.
  • As is known, a lifting and a pulling force or generally two oppositely directed forces can be generated by means of a differential piston. The advantage of the electro-hydraulic device compared to the differential piston is that no active control elements are required, but the control is taken over by the passive system itself.
  • Further developments of the invention can be found in the subclaims.
  • The essence of the invention will be explained in more detail with reference to two exemplary embodiments shown in the drawings.
  • Show it
  • Fig. 1
    the electrohydraulic device in a semi-schematic representation as a closed system and
    Fig. 2
    the electrohydraulic device in semi-schematic representation as an open system.
  • In Fig. 1, an electric motor 2 is arranged below the housing 1. A piston 4 is provided in the cylinder 3 and is connected to a piston rod 5. The piston space divides the cylinder space into an upper cylinder space 6 and a lower cylinder space 7. The size of the upper and lower cylinder space depends on the position of the piston. The cylinder 3 is closed above the piston 4 with respect to the storage space 14, whereby a closed system is formed. The piston rod 5 is guided through the cylinder wall by means of a seal 8. Furthermore, the housing 1 has a bushing 9 for the piston rod 5, a dirt scraper 11 being provided in the upper part of the bushing 9 and an outer seal 10 guided around the piston rod 5 in the lower part. In the closed system, the pump pressure only acts the inner seal 8, while the heating pressure of the operating fluid acts only on the outer seal 10.
  • A pump housing 12 for the two centrifugal pumps is located directly below the cylinder 3. A reservoir 14 for the operating fluid is formed between the wall 13 of the housing 1 on the one hand and the cylinder 3 and the pump housing 12.
  • The level of the operating fluid in the storage space is dimensioned such that a closed circuit with a communicating effect is established in the working space of the closed system.
  • A shaft 15 is driven by the electric motor 2 and protrudes into the pump housing 12 via a sealing passage 16 of the housing 1. The shaft 15 is connected to the two centrifugal pumps within the pump housing. In the exemplary embodiment, the two centrifugal pumps are formed by the impellers 17 and 18 and the flow body 19 in one unit. The two impellers 17 and 18 are connected to the shaft 15 via a freewheel 20. It is thereby achieved that, depending on the direction of rotation of the electric motor, one of the two impellers is carried along and the corresponding centrifugal pump is driven while the other impeller and the centrifugal pump assigned to it run freely. The impellers 17 and 18 are mounted on the shaft 15 facing each other.
  • The flow body 19 is designed as a hollow cylinder, the flow body 19 being at a distance from the impellers 17 and 18 and its cylindrical surfaces being approximately adapted to the course of the impellers. The flow body 19 has a bushing 21 and then the pump housing 12 has a bushing 22. These two bushings 21, 22 are required for the operation in the closed system. Via these two bushings, the storage space 14 for the operating fluid is connected to the interior of the flow body 19 in order to enable the volume compensation for the retracting and extending piston rod.
  • When driving the upper impeller 17 of the first centrifugal pump, operating fluid is drawn in from the cylinder space 6 above the piston 4 via the feedthrough 27, through the second (lower) centrifugal pump and via a pressure pipe 24, and is conveyed into the cylinder space 7 below the piston 4. A pressure is generated under the piston 4, which moves the piston 4 upwards and generates an upward pressure force on the piston rod 5. The upper cylinder chamber 6 has an opening 23 in its upper part, as a result of which a connection to the pressure tube 24 is established. The pressure pipe 24 lies outside the cylinder 3 and leads through the wall of the pump housing 12 into the area of the lower impeller 18 of the second centrifugal pump.
  • In the opposite direction of rotation of the motor, the impeller 18 and thus the second centrifugal pump are driven, as a result of which the operating fluid is conveyed from the cylinder space 7 via the suction opening 27 and the first centrifugal pump via the pressure pipe 24 and the opening 23 into the upper cylinder space 6. This creates a downward directed liquid pressure on the piston 4, which moves the piston downward and generates a downward pulling force on the piston rod 5. When the piston 4 moves downward in the cylinder 3, the operating fluid below the piston 4 is pressed via the first centrifugal pump 17 and the suction opening 27 by the centrifugal pump 18 via the pressure pipe 24 and the opening 23 into the upper cylinder chamber 6. During the reverse piston movement upwards, the operating liquid above the piston is pressed into the lower cylinder chamber 7 via the opening 23 and the pressure pipe 24 by the second centrifugal pump 18 and the suction opening 27.
  • The system thus works in a closed circuit, with the storage room, the two cylinder rooms and the pressure pipe in communicating connection with one another.
    2, the electrohydraulic device is designed as an open system, ie the cylinder 3 is open at the top and the surface 26 of the operating fluid is above the cylinder 3. In FIG. 2, the same parts as in the embodiment in FIG 1 provided with the same reference numerals.
  • For the piston rod 5, only the outer seal 10 is required, which, in contrast to FIG. 1, affects both the pump pressure and the heating pressure of the operating fluid. The pump housing 12 is open on its lower side, so that the impeller 18 of the second centrifugal pump can directly suck in the operating fluid when rotating in the intended direction of rotation. The flow body 25 between the impellers 17 and 18 is adapted to the shape of the impellers. Since it is an open system, the openings 21 and 22 provided in FIG. 1 are not necessary in this exemplary embodiment. The pressure pipe 24 required in FIG. 1 can also be omitted, since the cylinder 3 in the exemplary embodiment in FIG. 2 lies within the operating fluid in the antechamber 14.
    Otherwise, the method of operation in the exemplary embodiment according to FIG. 2 takes place in the same manner as is described in the functional representation of FIG. 1.
  • The formation of the first and second centrifugal pumps by means of the impellers 17 and 18 and the flow body 19 or 25 represents a simple and inexpensive implementation of the two centrifugal pumps. By using the freewheel sleeves 20 it is also possible to reverse one of the two impellers by simply reversing the direction of rotation of the electric motor and to put one of the two centrifugal pumps into operation while the other centrifugal pump is running freely. Different tensile and compressive forces can be achieved by different diameters of the two impellers 17 and 18. The electrohydraulic device can optionally also be operated in a position in which the piston rod is not arranged in the vertical direction.

Claims (7)

  1. An electrohydraulic device for generating a force acting on movable piston rod (5) that is connected with the piston (4) of a cylinder (3), the device further including a first centrifugal pump (17, 19) disposed in the portion of the cylinder (3) facing away from the piston rod (5) and connected by way of a shaft (15) with an electric motor (2), a housing (1) for the cylinder (3) and the centrifugal pump (17, 19), with the housing defining a reservoir (14) intended for the operating fluid and being provided with passages (16, 19) for the shaft (15) and the piston rod (5), with the operating fluid being pumped through a pressure conduit (24) as a function of the direction or rotation of the electric motor (2) from a cylinder chamber (6) above the piston (4) into a cylinder chamber (6) below the piston (4) or in the opposite direction, thus causing the piston (4) to be moved due to the pressure acting on it and to generate forces at the piston rod (5)
    characterized in that
    a second centrifugal pump (18, 19) is provides below the first centrifugal pump (17, 19); both centrifugal pumps (17, 19; 18, 19) are in communication with the reservoir (14) by way of a passage (21, 22); above the piston (4), the cylinder chamber (6) is closed toward the reservoir (14); if the electric motor (2) rotates in a predetermined direction of rotation, the shaft (15) drives the first centrifugal pump (17, 19) and, in the opposite direction of rotation, the shaft (15) drives the second centrifugal pump (18, 19), while the respective other centrifugal pump idles; and, during operation of the second centrifugal pump (18, 19), the operating fluid is conveyed through the pressure conduit (24) into the cylinder chamber (6) above the piston (4) and, due to the pressure acting on it, the piston (4) is moved downward, thus imparting a downwardly acting traction force on the piston rod (5).
  2. An electrohydraulic device for generating a force acting on a movable piston rod (5) that is connected with the piston (4) of a cylinder (3), the device further including a first centrifugal pump (17, 25) disposed in the portion of the cylinder (3) facing away from the piston rod (5) and connected by way of a shaft (15) with an electric motor (2), a housing (1) for the cylinder (3) and the centrifugal pump (17, 25), with the housing defining a reservoir (14) intended for the operating fluid and being provided with passages (16, 19) for the shaft (15) and the piston rod (5), with the operating fluid being pumped through a pressure conduit as a function of the direction or rotation of the electric motor (2) from a cylinder chamber (6) above the piston (4) into a cylinder chamber (7) below the piston (4) or in the opposite direction, thus causing the piston (4) to be moved due to the pressure acting on it and to generate forces at the piston rod (5)
    characterized in that
    a second centrifugal pump (17, 25) is provided on the shaft (15) below the first centrifugal pump (18, 25) and is connected, on the one hand, with the first centrifugal pump (17, 25) and, on the other hand, with the reservoir (14); the cylinder (3) is open to the reservoir above the piston (4) and the surface (26) of the operating fluid lies above the cylinder (3); if the electric motor (2) rotates in a predetermined direction of rotation, the shaft (15) drives the first centrifugal pump (17, 25) and, in the opposite direction of rotation, the shaft (15) drives the second centrifugal pump (18, 25), while the respective other centrifugal pump idles; and, during operation of the second centrifugal pump (18, 25), the operating fluid is conveyed into the cylinder chamber (6) above the piston (4) and, due to the pressure acting on it, the piston (4) is moved downward, thus imparting a downwardly acting traction force on the piston rod (5).
  3. An electrohydraulic device according to claim 1,
    characterized in that
    the two centrifugal pumps (17, 19; 18, 19) are constituted of two spaced apart facing impeller wheels (17, 18) that are arranged on the shaft (15) so as to rotate in opposite directions and of hollow cylindrical flow body (19) disposed between the impeller wheels (17, 18); and the cylinder chamber of the flow body (19) is connected with the reservoir (14) by way of passages (21, 22) in the cylinder wall and in the wall of a pump housing (12).
  4. An electrohydraulic device according to claim 2,
    characterized in that
    the two centrifugal pumps (17, 25; 18, 25) are constituted of two spaced apart facing impeller wheels (17, 18) that are arranged on the shaft (15) so as to rotate in opposite directions and of a flow body (25) disposed between the impeller wheels (17, 18).
  5. An electrohydraulic device according to claim 3 or 4,
    characterized in that
    the flow body (19, 25) is spaced from and approximately adapted to the course of the impeller wheels (17, 18).
  6. A electrohydraulic device according to one of claims 3 to 5,
    characterized in that
    the impeller wheels (17, 18) are mounted on the shaft (15) by means of oppositely rotating idler sleeves (20).
  7. An electrohydraulic device according to one of claims 3 to 6,
    characterized in that
    the impeller wheels (17, 18) of the two centrifugal pumps are configured to have different diameters.
EP92922852A 1991-11-12 1992-10-30 Electrohydraulic machine Expired - Lifetime EP0612378B1 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
DE19914137103 DE4137103C2 (en) 1991-11-12 1991-11-12 Electro-hydraulic device
DE4137103 1991-11-12
PCT/EP1992/002486 WO1993010361A1 (en) 1991-11-12 1992-10-30 Electrohydraulic machine

Publications (2)

Publication Number Publication Date
EP0612378A1 EP0612378A1 (en) 1994-08-31
EP0612378B1 true EP0612378B1 (en) 1995-12-06

Family

ID=6444570

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92922852A Expired - Lifetime EP0612378B1 (en) 1991-11-12 1992-10-30 Electrohydraulic machine

Country Status (10)

Country Link
US (1) US5519995A (en)
EP (1) EP0612378B1 (en)
JP (1) JPH07503781A (en)
CA (1) CA2112357C (en)
CZ (1) CZ289626B6 (en)
DE (1) DE4137103C2 (en)
ES (1) ES2080523T3 (en)
HU (1) HU213343B (en)
SK (1) SK280931B6 (en)
WO (1) WO1993010361A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481834A (en) * 2014-11-14 2015-04-01 宁波李氏实业有限公司 Plunger pump

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0742872B1 (en) * 1994-11-07 1999-10-06 Hobourn Automotive Limited Rotary pump and motor assembly
US5778671A (en) * 1996-09-13 1998-07-14 Vickers, Inc. Electrohydraulic system and apparatus with bidirectional electric-motor/hydraulic-pump unit
DK153197A (en) * 1997-12-23 1999-06-24 Anders Sten Wedell Hydraulenhed
JPH11240492A (en) * 1998-02-23 1999-09-07 Showa Corp Tilt lock device for outboard motor
DE10013194B4 (en) * 2000-03-17 2005-02-24 Festo Ag & Co.Kg driving device
JP2002240788A (en) * 2001-02-13 2002-08-28 Showa Corp Tilting device for vessel propeller
FR2831226B1 (en) * 2001-10-24 2005-09-23 Snecma Moteurs Autonomous electrohydraulic actuator
WO2006040090A1 (en) * 2004-10-08 2006-04-20 Stabilus Gmbh Linear drive
US8448432B2 (en) * 2007-02-13 2013-05-28 The Board Of Regents Of The University Of Texas System Actuators
JP2010190303A (en) * 2009-02-17 2010-09-02 Itec Co Ltd Double acting fluid pressure cylinder
US20100300279A1 (en) * 2009-06-02 2010-12-02 George Kadlicko Point Of Use Actuator
DE102016109103A1 (en) 2016-05-18 2017-11-23 Hoerbiger Automatisierungstechnik Holding Gmbh Electrohydraulic linear actuator
US9915073B1 (en) * 2016-12-12 2018-03-13 Andrew Hood Rainscreen building siding
DE102017206719A1 (en) * 2017-04-21 2018-10-25 Pintsch Bubenzer Gmbh Control cylinder arrangement for a brake release device, brake release device and brake assembly

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB379124A (en) * 1930-10-02 1932-08-25 British Thomson Houston Co Ltd Improvements in and relating to electro-hydraulic apparatus
DE842440C (en) * 1949-10-28 1952-06-26 Elmeg Electrohydraulic adjusting device incorporating a motor and directly above it, arranged pump
US2918795A (en) * 1955-09-06 1959-12-29 Ramsey Corp Electro-hydraulic actuating cylinder
DE1690019B2 (en) * 1967-08-04 1972-12-14 Mounting foot a fuehrungsschiene for lateral lead and keep pluggable printed circuit boards
JPS5717204B2 (en) * 1976-02-24 1982-04-09
DE2929442A1 (en) * 1979-07-20 1981-01-29 Elmeg Electrohydraulic servo with centrifugal pump - has elastic components separating hydraulic liq. from air
DE3607419C1 (en) * 1986-03-06 1987-01-15 Detlef Koeppen Pressure-medium-operated cylinder/pump unit
JPH107975A (en) * 1996-06-28 1998-01-13 Daicel Chem Ind Ltd Water-dispersed coating composition

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104481834A (en) * 2014-11-14 2015-04-01 宁波李氏实业有限公司 Plunger pump
CN104481834B (en) * 2014-11-14 2016-04-27 宁波李氏实业有限公司 A kind of plunger pump

Also Published As

Publication number Publication date
SK280931B6 (en) 2000-09-12
JPH07503781A (en) 1995-04-20
ES2080523T3 (en) 1996-02-01
SK54494A3 (en) 1994-10-05
CA2112357C (en) 2000-08-01
US5519995A (en) 1996-05-28
EP0612378A1 (en) 1994-08-31
WO1993010361A1 (en) 1993-05-27
HU213343B (en) 1997-05-28
DE4137103C2 (en) 1994-02-17
CA2112357A1 (en) 1993-05-27
CZ115994A3 (en) 1994-12-15
CZ289626B6 (en) 2002-03-13
DE4137103A1 (en) 1993-05-13
HUT68102A (en) 1995-05-29
HU9401484D0 (en) 1994-08-29

Similar Documents

Publication Publication Date Title
SU586850A3 (en) Axial-piston compressor
US9745975B2 (en) Method for controlling an artificial lifting system and an artificial lifting system employing same
US2282977A (en) Hydraulic operating mechanism for pumps
US20090194291A1 (en) Hydraulic oil well pumping apparatus
KR100791044B1 (en) Vacuum self-priming pump
US20050011188A1 (en) Electro-hydrostatic actuator with a failsafe system
KR970011594B1 (en) Deep cutting excavator
US5707221A (en) Method of plural zone pumping utilizing controlled individual pump inlet in each zone
JP4786638B2 (en) Inner scoping hydraulic system
RU52125U1 (en) Electric hydraulic drive pump unit
CA2425449C (en) Gas-lock re-prime device for submersible pumps
US3782117A (en) Oil well pumping apparatus
CA2488464C (en) Rotary and reciprocal well pump system
CN100385118C (en) Oil pump for a reciprocating hermetic compressor
SU639438A3 (en) Device for controlling crane beam raising and lowering
US20100143166A1 (en) Downhole pumping system
JP3485585B2 (en) Hydraulic machine with oil drainage device
CN200982285Y (en) Split type hydraulic plunger diaphragm pump
US3425574A (en) Hydraulic power unit for a doubleacting cylinder
FR2485678A1 (en) Method and mechanism for controlling pressure to parts securing a tree of a device and a fluid transport pump using the same
EA008428B1 (en) Submerged electro-hydraulic device
US6742629B2 (en) Valve control unit for a hydraulic elevator
US2167623A (en) Fluid operated pump jack
US20060045781A1 (en) Method and pump apparatus for removing liquids from wells
DE102016119823A1 (en) Electrohydraulic drive unit

Legal Events

Date Code Title Description
AK Designated contracting states

Kind code of ref document: A1

Designated state(s): DE ES IT

17P Request for examination filed

Effective date: 19931013

17Q First examination report despatched

Effective date: 19950509

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): DE ES IT

RAP1 Rights of an application transferred

Owner name: ELEKTRO-MECHANIK GMBH

REF Corresponds to:

Ref document number: 59204627

Country of ref document: DE

Date of ref document: 19960118

Format of ref document f/p: P

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2080523

Country of ref document: ES

Kind code of ref document: T3

Format of ref document f/p: P

ITF It: translation for a ep patent filed

Owner name: MODIANO & ASSOCIATI S.R.L.

26N No opposition filed
PGFP Annual fee paid to national office [announced from national office to epo]

Ref country code: ES

Payment date: 20041013

Year of fee payment: 13

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

Ref country code: DE

Payment date: 20041230

Year of fee payment: 13

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

Ref country code: IT

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

Effective date: 20051030

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

Ref country code: ES

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

Effective date: 20051031

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

Ref country code: DE

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

Effective date: 20060503

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20051031