FIELD: tool-making industry. SUBSTANCE: levers 1,2 are installed for mutual turning around pivot 7 positioned for movement in slot 8 of jaw 3 of lever 1. . Lever 2 has arched lug 33 for engagement with one of arched recesses 9 of lever 1. Made in wall 10 of slot 8 is rectangular recess 11 with shaped bores formed in it perpendicularly to pivot 7 according to the number of arched recesses 9. The bores accommodate shaped bars 13 for axial movement and alternate engagement with lug 33 intended to fix the mouth size. Bar 17 with replaceable disk 22 with lugs 24,25 placed on it is installed in hole 16 of jaw 3. EFFECT: improved design. 4 cl, 7 dwg
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