ROLLER BIT SUPPORT (VERSIONS) Russian patent published in 2013 - IPC E21B10/22 

FIELD: mining.

SUBSTANCE: lock unit is installed in a circular bore of a journal arranged between a circular collar and a base end of the journal. The feature of the proposed support according to one version is the fact that the lock unit is formed by a cylindrical bushing installed in the circular bore of the journal and rigidly connected with the cutter. The circular collar is arranged as detachable and is rigidly connected with the journal, and the cutter is connected with the bushing by means of left thread. According to another version, the feature of the support is the fact that the lock unit is formed by a cylindrical bushing installed in the circular bore of the journal and rigidly connected with the cutter. At the same time the circular collar is detachable and rigidly fixed with the journal, and the cutter is rigidly fixed relative to the bushing against slippage and axial displacement. Besides, the cutter is rigidly fixed relative to the bushing against slippage by means of their splint connection, and against axial displacement - with radially arranged pins.

EFFECT: simplified design of a support, higher reliability of its operation and higher performance of a bit as a whole.

2 cl, 3 dwg