(19)
(11) EP 2 685 006 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
03.09.2014 Bulletin 2014/36

(43) Date of publication A2:
15.01.2014 Bulletin 2014/03

(21) Application number: 13175274.3

(22) Date of filing: 05.07.2013
(51) International Patent Classification (IPC): 
E02D 5/34(2006.01)
E21B 10/32(2006.01)
 E02D 7/22(2006.01)
E02D 5/36(2006.01)
(84) Designated Contracting States:
AL 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 RS SE SI SK SM TR
Designated Extension States:
BA ME

(30) Priority: 12.07.2012 GB 201212419

(71) Applicant: Soletanche Freyssinet
92500 Rueil Malmaison (FR)

(72) Inventors:
  • Stansfield, Lewis
    92500 Rueil Malmaison (FR)
  • Ako, Steve
    92500 Rueil Malmaison (FR)

(74) Representative: Balesta, Pierre et al
Cabinet Beau de Loménie 158, rue de l'Université
75340 Paris Cedex 07
75340 Paris Cedex 07 (FR)

   


(54) Cutting head with a retractable threading tooth actuated by a rack/gear system


(57) A cutting head comprising a hollow cylindrical core with a helical flight;
• a threading tooth presenting an extended and a retracted position;
• displacement means for displacing said threading tooth between said retracted position and said extended position, said displacement means comprising:
• an inner hollow tubular member mounted to move into said hollow cylindrical core in translation along said longitudinal axis and disposed at least at the bottom end of said hollow cylindrical core;
• a rack fixed to the inner hollow tubular member,
• at least a gear cooperating with the rack, said gear being mounted on the bottom end of the hollow cylindrical core,
• a lever connected to the gear;
• a connecting rod pivotally connected to the lever and to the threading tooth, whereby the translation of the rack causes the displacement of the threading tooth.






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