HYDROWEDGE DEVICE DRIVE Russian patent published in 2007 - IPC E21C37/02 

FIELD: methods or devices for dislodging by wedges, particularly downhole and blast-hole rock-cutting means.

SUBSTANCE: hydrowedge device drive comprises body made as hydraulic cylinder 1 provided with through orifice 6 made in central part thereof. Wedge device installed inside body includes transversal wedge 2 located inside central part of hydraulic cylinder 1 and provided with two working chambers and two pistons 3, 4 connected to ends of transversal wedge 2 with through longitudinal vertical orifice 5. Lower working surface 19 of wedge may cooperate with support 17 of the hydrowedge device. The support is installed in lower part of through vertical orifice 6 made in hydraulic cylinder 1. Working surfaces of pistons 3, 4 are transversal to hydraulic cylinder 1 axis 9. Direction of piston 3, 4 force application to transversal wedge 2 coincides with hydraulic cylinder 1 axis 8. Upper working plane 24 of transversal wedge 2 is transversal to orifice 6 axis and may cooperate with compensating nut 22 of hydrowedge device arranged in upper part of through vertical orifice 6. Vertical orifice 6 axis extends at 90°+α angle to axis 9 of the hydraulic cylinder 1 from the side of large wedge 2 base. Here α is angle between upper working surface 24 of transversal wedge 2 and axis 9 of the hydraulic cylinder 1. Friction surfaces are treated to provide antifriction properties thereof.

EFFECT: simplified device structure along with reduced mass and size thereof and increased convenience of hydrowedge device usage.

7 cl, 2 dwg