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(11)

EP 3 577 317 A1

(12)

(43) Date of publication: 11.12.2019 Bulletin 2019/50 (21) Application number: 18748800.2 (22) Date of filing: 05.02.2018

(51) International Patent Classification (IPC):  E21D 20/00(2006.01) B23B 51/08(2006.01) B25F 3/00(2006.01) B23B 45/16(2006.01) B25B 21/02(2006.01) F16B 13/10(2006.01) (86) International application number: PCT/CA2018/000024 (87) International publication number: WO 2018/141052 (09.08.2018 Gazette 2018/32)

(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 Designated Validation States: MA MD TN (30) Priority: 03.02.2017 US 201762454717 P (71) Applicant: Grand, Gérard St. Catharines, ON L2T 3N3 (CA)	(72) Inventor: Grand, Gérard St. Catharines, ON L2T 3N3 (CA) (74) Representative: Orr, Robert  Urquhart-Dykes & Lord LLP Arena Point Merrion Way Leeds LS2 8PA Leeds LS2 8PA (GB)