Machine for and method of stemming blast holes

Details Machine for and method of stemming blast holes Machine for and method of stemming blast holes

1975-02-07

1976-06-08

Shapiro, Jacob

Earth working

With ground support vertically adjustable relative to frame

Translating motion

61 35, 37118R, 172253, E02D 2912, E02B 100, A01B 6300

Patent

active

039614921

ABSTRACT:
In accordance with the invention, the stemming of blast holes, i.e. the covering (with peviously removed earth materials) of explosive charges placed in receiving boreholes drilled downwardly from generally horizontal surfaces in open-pit mines, involves the proper manipulation of a special vehicle relative to earth material cuttings that collect concentrically about the mouth of such a borehole during the drilling operaton. The vehicle carries a combination of earth-moving blades that can be raised and lowered as a unit and that comprises a transverse pusher blade mounted on one end of the vehicle and a pair of elongate auxiliary blades pivotaly mounted on and in mutually spaced relationship transversely of the pusher blade as arms which can be swung toward and away from each other. The auxiliary blades have respective tip portions turned toward each other, and are preferably arranged to stop short of meeting when swung together so as to accommodate the blast cord between such tip portions. In carrying out the method, the vehicle with auxiliary blades extended outwardly is moved directly toward and to the hole, so the pusher blade will engage and push drill cuttings into the hole from the front; the auxiliary blades are then swung together for pushing drill cuttings into the hole from its opposite sides; and then, without retracting the auxiliary blades, the vehicle is backed away from the hole, so the tip portions of the auxiliary blades will pull drill cuttings into the hole from the rear.

REFERENCES:
patent: 2556592 (1951-06-01), Markkula
patent: 3198568 (1965-08-01), Mindrm

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