(19)
(11) EP 2 698 500 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
21.06.2017 Bulletin 2017/25

(43) Date of publication A2:
19.02.2014 Bulletin 2014/08

(21) Application number: 13174793.3

(22) Date of filing: 02.07.2013
(51) International Patent Classification (IPC): 
E21D 15/28(2006.01)
E21D 15/51(2006.01)
 E21D 15/44(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: 17.08.2012 ZA 201206199

(71) Applicant: Mine Support Products (pty) Ltd
Vereeniging 1939 (ZA)

(72) Inventor:
  • Nissen, Christian
    Duncanville, Vereeniging, 1939 (ZA)

(74) Representative: Patentanwälte Ruff, Wilhelm, Beier, Dauster & Partner mbB 
Kronenstraße 30
70174 Stuttgart
70174 Stuttgart (DE)

   


(54) Prop


(57) A prop which includes first and second telescopically engaged tubular members, wherein at least one member is internally pressurized with water and wherein yielding is controlled by means of a friction ring acting between opposing surfaces of the two members and by a release valve which controls the pressure of the water.







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