Patent ID: 6893026

Claim:
A blade attaching and detaching mechanism for attaching a blade to a reciprocal power tool, the blade having a blade attachment end portion formed with a blade hole, the mechanism comprising: a plunger driven reciprocally in a lengthwise direction thereof and having a tip end portion formed with a blade insertion portion extending substantially in a reciprocal movement direction of the blade and an engagement hole substantially perpendicular to the blade insertion portion; an engagement member protrudable into and retractable from the engagement hole and engageable with the blade hole when the blade attachment end portion of a blade is inserted into the blade insertion portion; a knob provided at the tip portion of the plunger and pivotally movable about a pivot axis that extends perpendicular to the lengthwise direction of the plunger, the knob having an acting surface acting on the engagement member for regulating protrusion and retraction of the engagement member into and out from the blade hole upon pivotal movement of the knob; and a first biasing member for urging the knob to pivot in a direction to permit the engagement member to protrude into the blade hole.