US Patent 9388885 Multi-tool transmission and attachments for rotary tool

An embodiment of the present invention is directed to a drive mechanism for translating rotational output from a moveable member of a rotary tool to an interchangeable attachment having a movable member. The drive mechanism includes a rotatable drive shaft sized and shaped for insertion into the rotary member of the rotary tool, a connector adapted to selectively secure the drive mechanism to the interchangeable attachment, a reciprocating drive member adapted to contact the movable member of the interchangeable attachment and to cause the movable member to move, when the interchangeable attachment is secured to the drive mechanism, and a transmission configured to translate rotation of the drive shaft into reciprocating motion of the drive member.