HARDNESS METER Russian patent published in 2009 - IPC G01N3/42 

FIELD: physics, measurement.

SUBSTANCE: invention is related to the field of construction and operation of unpaved aerodromes arranged by means of snow compaction method. Hardness meter comprises body equipped with ball element having through opening, rod with conical tip and locking device. At that replaceable weight is installed on tip, ball element opening has guide tube rigidly fixed, in upper and lower parts of which at least three through rectangular openings are arranged, which are evenly located in plane that is perpendicular to tube axis. Every opening contains fork that might longitudinally move in them and in cylindrical opening of bracket, which is rigidly fixed on guide tube, with frictionless bearing installed on one of fork ends, external race of which touches rod surface with conical tip. At that other end of fork arranged with thread is installed in bracket, and locking device for fixation of ball element consists of bolt and bushing arranged with cylindrical grooves. Besides longitudinal groove is arranged along longitudinal axis of guide tube with transverse projection, at that indicator with arrow enters the groove, and this indicator indicates value of rod lifting and submersion of conical tip by length bar feed marks.

EFFECT: higher accuracy of snow cover strength definition.

5 dwg