(19)

(11)

EP 3 491 243 A1

(12)

(43) Date of publication: 05.06.2019 Bulletin 2019/23 (21) Application number: 16738739.8 (22) Date of filing: 12.07.2016

(51) International Patent Classification (IPC):  F04B 37/14(2006.01) F04B 41/06(2006.01) F04B 49/06(2006.01) F04B 41/02(2006.01) F04B 49/00(2006.01) (86) International application number: PCT/EP2016/066488 (87) International publication number: WO 2018/010767 (18.01.2018 Gazette 2018/03)

(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 (71) Applicant: Dr.-ing. K. Busch GmbH 79689 Maulburg (DE)	(72) Inventor: RENNER, Hubert 79689 Maulberg (DE) (74) Representative: BOVARD AG  Patent- und Markenanwälte Optingenstrasse 16 3013 Bern 3013 Bern (CH)