Interchangeable tool operating apparatus with plural motion

Abstract

Novel tool operating apparatus is exemplified in a dental treatment device capable of driving alternatively at least a first tool and a second tool, each tool being intended to execute a different form of motion, with a single tool driving means to which each of several different tools can be removably coupled. The driving means includes a rotatable drive shaft fitted with tool engagement means in the form of a disc affixed to the shaft and lying in a plane that makes an acute angle with the rotational axis of the shaft. One tool can be fitted over the shaft to engage the disc so as to rotate the tool with the shaft. A second tool can be fitted over the shaft so that the shaft can rotate within the tool, but the tool will not rotate with the shaft. The second tool has means for cooperating with the shaft so as to execute an oscillatory motion relative to the shaft axis. Tools capable of two optional forms of oscillatory motion are disclosed--in one the motion is parallel to the axis of the shaft; in another the motion is nutational. The drive shaft can be provided with a fluid passage on its rotational axis through which to provide fluid such as a dental treatment agent to the tools, and each form of tool can be fitted with ducts for dispensing such an agent. Further tools suitable for endodontal use are disclosed.