MECHANICAL CALIPER WITH HAND DRIVE FOR EXPLOSIVE WELLS Russian patent published in 2018 - IPC E21B47/04 E21B47/08 B66D1/04 G01B5/04 

FIELD: mining.

SUBSTANCE: invention relates to the field of the blast holes diameters and depth measuring facilities in the strong rocks explosive loosening. Mechanical caliper with a manual drive for blast holes, consisting of a suspended on a metric metal tape rod to measure the borehole depth; to the rod lower end lugs are secured, in which two measuring levers are pivotally mounted, pivotally connected to the freely attached to the rod movable bushing by tie-rods, and on the bushing the metric metal tape end is fixed for the borehole diameter measuring. At that, the caliper is suspended on a manual winch, on which shaft the well depth measuring metal metric tape winding reel is rigidly fixed, and freely with sliding relative to the shaft, the well diameter measuring metal metric tape winding reel is installed, on wells depth measuring metal metric tape winding reel, a ratchet stop is installed to fix the caliper position at a given depth, and the winch supports are provided with retractable sections.

EFFECT: technical result is a reduction in labor input and an increase in productivity when lifting and lowering and holding the caliper at a given depth of the well, provision of the possibility of making a well depth general measurement and the exact value of the change in the well diameter with changes in the diameter both in smaller, and in the larger sides, design simplification and decrease in the lowered into a well caliper weight.

1 cl, 7 dwg