Abstract: A boring bit includes a shank adapted to be mounted on a rotary tool. A blade is mounted on the shank and is resiliently deformable to reduce its boring diameter.

Abstract: A motion converting mechanism according to the present invention is constructed such that pinions (10, 11) are engaged with a circular arcuate gear (8) for performing reciprocating circular arcuate motions about a pivot, and two sets of one-way clutch mechanisms (16-19) are provided in the transmission path from the pinions (10, 11) to an output shaft (1), thereby rotating the output shaft (1) in the same direction. With this arrangement, the output shaft (1) is rotated in the same direction during both forward and reverse movements of the circular arcuate gear (8).Further, a rotary tool according to the present invention is adapted to utilize the above motion converting mechanism, and a grip portion (6) of a reciprocating pivotal member is reciprocatingly pivoted relative to a lever portion (5) of a main body, so that an output gear (4) can be rotated in the same direction, thereby rotating a work to be rotated in the same direction.

Abstract: A rotary tool, such as a screwdriver, in which a grip is grasped and released, so that the output shaft is rotated in the same direction during both actions comprises a motion converting mechanism wherein two sets of one-way clutch mechanisms are added to a mechanism for converting a rectilinear reciprocating motion into a rotary motion through a rack gear and pinion combination. The two sets of one-way clutch mechanisms include one that engages during the reverse movement of the rack gear, both of which rotate an output shaft in the same direction when they engage. With this arrangement, the motion converting mechanism according to the present invention rotates the output shaft in the same direction during both forward and reverse movements of the rack gear, thereby improving efficiency in converting the reciprocating motion into the rotary motion.

Abstract: A motion converting mechanism wherein two sets of one-way clutch mechanisms are added to a mechanism for converting a rectilinear reciprocating motion into a rotary motion through a rack and pinion combination. The two sets of one-way clutch mechanisms include one that engages during the forward movement of the rack and the other that engages during the reverse movement of the rack, both of which rotate an output shaft in the same direction when they engage. With this arrangement, the motion converting mechanism according to the present invention can rotate the output shaft in the same direction during both forward and reverse movements of the rack, thereby improving efficiency in converting the reciprocating motion into the rotary motion as compared with the conventional one. Thus, various rotary tools utilizing this motion converting mechanism can be provided.