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1. (WO2017151030) WATER JET UNIT AND METHOD FOR WORKING A SURFACE

Pub. No.:    WO/2017/151030    International Application No.:    PCT/SE2017/000009
Publication Date: Sat Sep 09 01:59:59 CEST 2017 International Filing Date: Wed Feb 08 00:59:59 CET 2017
IPC: E01C 23/12
Applicants: CONJET AB
Inventors: NILSSON, Kjell
Title: WATER JET UNIT AND METHOD FOR WORKING A SURFACE
Abstract:
A surface, e.g., a concrete surface, is worked by guiding a lance (23) which comprises a water jet mouthpiece (27) coupled to the high-pressure water over the surface in a working path and at the same oscillating the lance transversely to the working path. The oscillation is driven by an eccentric mechanism (30, 31) and has a stable eccentric position when the mechanism is rotated in the one direction and a stable eccentric position when it is rotated in the other direction. The two positions have a different eccentricity and impart different widths to the working. The working depth and the working width can be changed by changing the direction of rotation.