| 摘要 |
FIELD: manual mounting tools, possibly development and making of wrenches with open span. ^ SUBSTANCE: wrench has head with open span restricted by two jaws and connection portion having at side of jaws recess with cylindrical surface. Value of arc radiuses R of outer contour of head restricting outer size of head in plane of jaws arrangement is set according to relation R>=0,5x(-S/2), where B - outer size of head in plane of jaws arrangement; S - nominal size of span. Curvature centers of said arcs are arranged on arc of recess of connection portion. ^ EFFECT: enhanced operational reliability and safety of wrenches. ^ 2 dwg |
