MACHINE TAP Russian patent published in 2015 - IPC B23G5/06 

FIELD: construction.

SUBSTANCE: machine tap contains the cutting part comprising starting and calibration parts with channels for removal of chips formed during thread cutting and the pin fixed in the central hole of the tap. It is formed by two parts one of which is the cutting part, mutually conjugate by the sliding sitting by means of longitudinal grooves and similar by the form and the size of ledges, the latter of which are made on the head of the cutting part. The central hole is common for both parts of the tap, and the pin is L-shaped with the unbent part, the starting part has the cross groove for fixing the named unbent part of the pin, and on another end the pin is provisioned for the standard key. Geometrical shapes of the head and the conjugate part can be square, rectangular or crosswise, providing exact mutual joining with the head, while the tap is made with the transverse shearing strength in the head location less, than the similar strength in any other location of the tap. L-shaped pin can be fixed in the central hole of the tap by means of pressing. The head of L-shaped pin can have square shape.

EFFECT: operation reliability improvement.

4 cl, 2 dwg