Global patent index - EP 0773854 B1

EP 0773854 B1 2000-01-26 - POWER SCREWDRIVER AND PROCESS FOR TIGHTENING SCREWS

Title (en)

POWER SCREWDRIVER AND PROCESS FOR TIGHTENING SCREWS

Title (de)

SCHRAUBER UND VERFAHREN ZUM ANZIEHEN EINER SCHRAUBVERBINDUNG MITTELS DES SCHRAUBERS

Title (fr)

VISSEUSE ET PROCEDE DE SERRAGE DE VIS

Publication

EP 0773854 B1 (DE)

Application

EP 95919965 A

Priority

  • DE 9500711 W
  • DE 4427452 A

Abstract (en)

[origin: DE4427452A1] A power screwdriver has a hydraulic percussion mechanism (17) with an input shaft (16) capable of being rotated by a drive motor (12) and an output shaft (18) coupled to a screw driving tool. The percussion mechanism (17) further has a high pressure chamber (35) and a low pressure chamber (36) filled with a pressure medium and in communication through an overflow duct (37). The overflow duct (37) has a constant flow cross-section. An angular momentum (M) that can be utilized at the output shaft (18) is generated by changing the speed of rotation (n) of the input shaft (16). For that purpose, the screwdriver (10) has means (27) for preselecting the speed of rotation (n) of the input shaft (16) or the angular momentum (M) at the output shaft (18).

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

B25B 23/147

IPC 8 full level (invention and additional information)

B25B 21/02 (2006.01); B25B 23/145 (2006.01); B25B 23/151 (2006.01)

CPC (invention and additional information)

B25B 23/1456 (2013.01); B25B 21/02 (2013.01); B25B 23/1453 (2013.01)

Designated contracting state (EPC)

DE FR GB SE

EPO simple patent family

DE 4427452 A1 19960208; EP 0773854 A1 19970521; EP 0773854 B1 20000126; JP H10503432 A 19980331; WO 9604106 A1 19960215

INPADOC legal status

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2005-01-19 [GBPC] GB: EUROPEAN PATENT CEASED THROUGH NON-PAYMENT OF RENEWAL FEE

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2000-04-26 [GBT] GB: TRANSLATION OF EP PATENT FILED (GB SECTION 77(6)(A)/1977)

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2000-04-14 [ET] FR: TRANSLATION FILED

2000-03-02 [REF] CORRESPONDS TO:

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1998-01-28 [17Q] FIRST EXAMINATION REPORT

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