Apparatus for converting side-to-side driving motion to rotational motion with a spring assembly and system for tuning the spring assembly

An appliance which includes a workpiece mounted on a drive shaft, comprising:

• a handle portion which houses a drive system for the appliance;
• an assembly for converting side-to-side substantially linear drive action of the drive system to rotational motion for the workpiece, which includes a movable base mounting element which is driven by the drive system in a side-to-side substantially linear reciprocal motion;
• a fixed mounting element spaced apart from the base element, wherein the fixed mounting element is held in position so that it does not move during operation of the apparatus;
• a spring member connected to the movable base element and fixedly connected to the fixed mounting element;
• a drive shaft member connected to the base element and rotatable relative to the fixed mounting element;
• and
• a workpiece attached to the drive shaft member, wherein the spring member is so configured that it is substantially less resistant to twisting action than to bending action, the twisting action producing workpiece rotation at a preselected frequency.

An apparatus for converting side-to-side substantially linear drive motion to rotational motion for a workpiece portion of an appliance, comprising:

• a movable base mounting element, capable of being driven in a side-to-side substantially linear reciprocal motion;
• a fixed position mounting element, wherein the fixed mounting element is held in position so that it does not move during operation of the apparatus;
• a spring assembly connected to the movable base element and fixedly connected to the fixed mounting element;
• and
• a drive shaft member connected to the base element and extending away from the movable base element and the fixed mounting element, the drive shaft having a workpiece connected thereto;
• wherein the spring member is so configured and arranged that it is substantially less resistant to twisting action than to bending action, the twisting action producing workpiece rotation at a preselected frequency.