Patent ID: 7762903
Filing Date: 2010-07-27
Classification: A63B

Abstract:
1. A bowling ball thumb insert comprising: a first sleeve with a cylindrical wall having an outer wall surface adapted to fit into a bowling ball and a cylindrical inner wall surface for receiving a second sleeve, said first sleeve having a distal end adapted to be positioned adjacent a bowling ball bore end, two circumferential ledges extending radially inward from said cylindrical inner wall surface, said two ledges opposing one another and defining two gaps; said two gaps having unequal circumferential sizes and both said gaps having a circumferential length of at least 60° about the circumference of said inner surface; a second sleeve positioned within said first sleeve, said second sleeve including a cylindrical wall having an outer cylindrical surface adjacent said inner cylindrical surface of said first sleeve; said second sleeve including two locking wings at a distal end of said second sleeve, said two locking wings extending radially outward from said outer surface and having a circumferential length slightly smaller than the gaps, said two locking wings extending circumferentially about said outer surface for positioning through said gaps and for being rotated to mate with said two circumferential ledges; a stop extending radially inward from said inner cylindrical wall surface adjacent said ledge having a detent, said detent spaced radially inward from said inner cylindrical wall surface; and a projecting member on said second sleeve adjacent said ledge for mating with said detent, said projecting member spaced and separated from said second sleeve ledge and projecting radially outward from said outer cylindrical surface such that said projecting member does not project beyond an outer circumference of said second sleeve ledge.