Global Patent Index - EP 0738826 B1

EP 0738826 B1 2000-11-29 - Hydraulic device with differential pistons and its application to a varible thrust drive

Title (en)

Hydraulic device with differential pistons and its application to a varible thrust drive

Title (de)

Hydraulische Stufenkolbenanordnung und deren Anwendung in einem Antrieb mit einer variablen Schubkraft

Title (fr)

Dispositif hydraulique à pistons différentiels et son application à une commande à poussée variable

Publication

EP 0738826 B1 (DE)

Application

EP 95810254 A

Priority

EP 95810254 A

Abstract (en)

[origin: EP0738826A1] The piston device comprises two guided pistons (9,11) of different cross sections, In one position, their endfaces (9b,11a) are in contact. A pressure cell (30,15a-c) is filled with hydraulic fluid to transmit force between the pistons. A reservoir (20) and channel (25) enable the amount of fluid in the cell to be altered. This is done by forcing hydraulic fluid through the channel, which is connected to the pressure cell, controlled by one of the pistons, which in a certain position cuts off the inflow of hydraulic fluid. This in turn enables the force transmitted between the pistons to be controlled.

IPC 1-7 (main, further and additional classification)

F01L 9/02; F15B 15/17

IPC 8 full level (invention and additional information)

F01L 9/02 (2006.01); F15B 3/00 (2006.01); F15B 11/028 (2006.01); F15B 15/17 (2006.01)

CPC (invention and additional information)

F01L 9/02 (2013.01); F15B 15/17 (2013.01)

Designated contracting state (EPC)

DE DK FR IT NL

EPO simple patent family

EP 0738826 A1 19961023; EP 0738826 B1 20001129; CN 1088150 C 20020724; CN 1144299 A 19970305; DE 59508878 D1 20010104; DK 0738826 T3 20001227; JP 4164132 B2 20081008; JP H08284905 A 19961101; KR 100380568 B1 20030718

INPADOC legal status


2015-04-20 [REG DK EUP] PATENT EXPIRED

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2015-04-19 [REG DE R071] EXPIRY OF RIGHT

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2001-11-21 [26N] NO OPPOSITION FILED

2001-02-16 [ITF] IT: TRANSLATION FOR A EP PATENT FILED

- Owner name: ING. ZINI MARANESI & C. S.R.L.

2001-01-12 [ET] FR: TRANSLATION FILED

2001-01-04 [REF] CORRESPONDS TO:

- Document: DE 59508878 20010104

2000-12-27 [REG DK T3] TRANSLATION OF EP PATENT

2000-11-29 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: B1

- Designated State(s): DE DK FR IT NL

2000-04-12 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19980629

1998-08-12 [17Q] FIRST EXAMINATION REPORT

- Effective date: 19980629

1997-08-27 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: WAERTSILAE NSD SCHWEIZ AG

1997-05-14 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 19970318

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- Designated State(s): DE DK FR IT NL

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1996-10-23 [AX] REQUEST FOR EXTENSION OF THE EUROPEAN PATENT TO

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1996-10-23 [RAX] REQUESTED EXTENSION STATES OF THE EUROPEAN PATENT HAVE CHANGED

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