HARDNESS TESTER Russian patent published in 2015 - IPC G01N3/42 

FIELD: construction.

SUBSTANCE: hardness tester comprises a case, provided with a ball element, having through hole, guide pipe, rod with pointer with arrow, conical tip and replaceable load, fixed with nut. Case is designed in the form of collar, inside which the split-type ferrule is enclosed, covering the ball element. Tension in the connection ball element - split-type ferrule is provided with bolt and nut, tightening the ends of collar. The guide tube is made with possibility of axial displacement upward and downward relative to the ball element and case by means of rack-and-gear drive. Fixation of rod changed over to the extreme upward position with conical tip, changeable load and nut, as well as provision of their fall during measurement is carried out using the pointer with arrow and gate, connected by the drive cable with the twist-type trigger, installed on one of two handles, placed at the bottom of the guide tube, where the rack bearing the thrust ring and level indicators is also installed. Fixation of the guide tube in the ball element at the end of the device setting is carried out by the locking bolt. Hardness tester is leaned upon the inspected covering by means of three telescopic columns.

EFFECT: improved accuracy of determining the strength of snow cover, reduction of labour coefficient of works related with the measurement of this parameter and provision of serviceability of the device by the operator.

4 dwg