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1. (WO2018054485) HYDRAULIC SCREW TENSIONER

Pub. No.:    WO/2018/054485    International Application No.:    PCT/EP2016/072711
Publication Date: Fri Mar 30 01:59:59 CEST 2018 International Filing Date: Sat Sep 24 01:59:59 CEST 2016
IPC: B25B 29/02
Applicants: ATLAS COPCO INDUSTRIAL TECHNIQUE AB
Inventors: EVANS, David Michael
LEE, Adam Thomas
Title: HYDRAULIC SCREW TENSIONER
Abstract:
A hydraulic screw tensioning device comprising a tubular body (10) with a through opening (11) and an annular cylinder chamber (12) surrounding the through opening (11), a tubular piston (14) movably supported in the body (10) and connectable to a screw to be tensioned, the piston (14) comprises a stepped outer portion (12a) and dividing the cylinder chamber (12) into a first pressure chamber (15) and a second pressure chamber (16), whereof the second pressure chamber (16) is closed by an annular end cap (13) secured to the body (10), the first pressure chamber (15) is connectable to a pressure source for hydraulic fluid whereas the second pressure chamber (16) is connectable to a pressure source for a compressible medium via a conduit connector (28) mounted on the end cap (13), and the conduit connector (28) for compressible medium extends radially in relation to the geometric axis (A-A) of the tubular body (10), and is protected against accidental physical damage by a damage protecting structure (24,25) radially extending from the end cap (13).