CRACK FORMING DEVICE Russian patent published in 2005 - IPC

FIELD: mining industry, particularly to create initial transversal cracks in rock massive for following cutting thereof by fluid fracturing plane development.

SUBSTANCE: device has cup with longitudinal windows. Installed in the cup are crossing cutting members, pusher with crossing oppositely formed inclined guiding members and pusher return spring. Cutting members are installed so that cutting parts thereof may slide out of longitudinal cup windows during pusher movement along inclined guiding members. The inclined guiding members are formed on the pusher and have profiled contours. Pusher is installed so that pusher may slide into the cup. Pusher return spring is arranged on the cup and fixed in initial position. In initial position cutting members are installed on common axis and fixed on above inclined guiding members by figured springs.

EFFECT: increased diameter of initiating cut cavity and provision of favorable cutting regime along with simplified structure.

2 dwg