Patent ID: 6997446
Filing Date: 2006-02-14
Classification: A61C,F16F

Abstract:
1. A spring adapted for rotational action, comprising: a first member substantially fixably attached to an appliance body member, the first member having an open center area extending through said first member to permit an appliance driving member which rotates in operation to extend freely therethrough, wherein the first member is a lower ring member which substantially encircles the driving member; a second member spaced apart from the first member and adapted to receive said appliance driving member, wherein when the driving member moves through a selected range of rotational movement, the second member rotates in response thereto, wherein the second member is an upper disc having a central opening through which the driving member is tightly fitted in such a manner that as the driving member rotates, the second member rotates therewith relative to the first member; and at least two leg members connecting the first and second members, wherein the leg members are constructed and arranged and characterized such that when the driving member moves to end points of its range of rotational movement, having rotated the second member with the leg members attached thereto, the energy stored in the spring thereby tends to return the spring toward its original center position.