Safety tensioner for tool, has adjusting wheel to receive buckles that protrude when wheel rotates so that fastening parts of buckles abut against gears of articulation block of plunger head and retainer to fasten head and retainer

摘要

The tensioner has a plunger head (1) with an articulation block (12) at its end. A middle portion of an articulating unit has a receiving unit for receiving an adjusting wheel (42) that includes screw holes for receiving buckles. The buckles protrude when the wheel rotates, such that fastening parts of the buckles abut against gears of the block and a retainer (3), respectively for fastening the head and the retainer.