FIELD: mining..
SUBSTANCE: invention refers to boring tool, particularly to interlock connections of screws. The interlock connection consists of a coupling and a nipple connected with a cylinder thread and of interacting with one another stops made in form of teeth. Also the teeth are formed on an end surface of circular elements stationary connected with the coupling and the nipple. The working surface of teeth is located on the plane of the screw axis, while the tilt angle of the tooth back is not less, than the angle of lead.
EFFECT: upgraded efficiency of screw.
3 dwg
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