FIELD: oil extractive industry.
SUBSTANCE: device has forming portion, profile of which is an even-sided triangle, and even-sided trapezoid combined by lesser base to triangle base and by larger base - to spreader portion of knurl. Spreader portion has even-sided trapezoid shape, greater base of which is combined with hub of knurl. Between forming and spreader portion and between larger base of spreader portion trapezoid and hub a portion is placed with sides parallel to axis of knurl. Place for transfer of these portions to spreader portion and of spreader portion into hub is made with rounding-offs.
EFFECT: simplified operation.
1 dwg
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