Patent ID: 8528170
Filing Date: 2013-09-10
Classification: A63B,B25G,Y10T

Abstract:
1. An ergonomic tool handle connected to a utility hand tool shaft including an upper shaft surface having an upper shaft plane, a lower shaft surface having a lower shaft plane, two side shaft surfaces having side surface planes, a shaft depth and a shaft centerline, the ergonomic tool handle comprising: a shaft engagement end; a handle termination end opposite said shaft engagement end; a upper handle surface; a lower handle surface comprising a lower surface spline, said lower surface spline extending inwards uniformly and smoothly in the direction of the lower shaft plane in a first lower handle surface portion beginning at said shaft engagement end, said lower surface spline extending in a direction back towards the lower shaft plane in a second lower handle surface portion beginning at said first lower handle surface portion and extending towards said handle termination end; an upper surface spline extending uniformly and smoothly from the upper shaft plane in a direction away from the lower shaft plane in a first upper surface portion and extending uniformly and smoothly back in the upper shaft plane direction in a second upper handle surface portion; an initial downward bulge positioned at said lower handle surface portion to act as a stop for a user's grip; a rounded downward protrusion portion running between said upper handle surface towards said lower handle surface at said handle termination end; and two handle side surfaces running generally parallel to the two side shaft surfaces; wherein said upper and lower surface splines are configured to provide an ergonomic wrist grip such that the shaft centerline is generally aligned with a user forearm centerline.