Force Technology Corp.

Banestyrelsen

Steen Arnfred Nielsen

Peder Bent Hansen

Alexander Bardenshtein

Niels Kloppenborg Laursen

The present invention relates to a vacuum wall crawler having at least one vacuum track unit comprising a track frame, two pulleys provided in opposite ends of the track frame, and defining a wheelbase, an endless track arranged to circulate on the two pulleys, and comprising a flexible band, said flexible band comprising a plurality of apertures, and having a thickness, a vacuum distribution box provided in said track frame wherein the vacuum distribution box is in communication with a portion of the apertures to distribute a vacuum to the portion of apertures as the endless track circulates, where the thickness of the flexible band is 5-20% of the wheel base.

Vacuum wall crawler

A method of detecting defects in a railway track rail, the rail () having a longitudinal centre plane and a surface, the surface including a running surface (), the method comprising directing an excitation laser beam () to an excitation position () on the surface of the rail () to induce an ultrasonic wave in the rail (); and directing a detection laser beam () to a detection position () on the surface of the rail () to detect at least one predetermined property of the induced ultrasonic wave; wherein the excitation position () and the detection position () are located on the running surface () and displaced from the longitudinal centre plane of the rail ().

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Jyllinge, Denmark

Steen Arnfred Nielsen