Gilbert A Barfield

US Patent:

6547678, Apr 15, 2003

Filed:

Oct 15, 2001

Appl. No.:

09/977628

Inventors:

Gilbert Barfield - Carrabelle FL 32322

International Classification:

A63B 3714

US Classification:

473383

Abstract:

A vortex generating golf ball dimple for producing a turbulent boundary layer on the surface of a golf ball during its flight is a composite of a plurality of overlapping smaller concave sections. Preferably, the dimple is a plurality of peripheral spherical sections overlapping a central spherical section to form a ridge-like polygon. The polygon, the top edge of which lies below the outer edges of the dimple, acts as a vortex generating structure within the dimple concavity for producing the turbulent boundary layer. Each pair of opposite or near opposite sides of the polygon has a common cross-sectional shape or structure. The aerodynamic characteristics of the cross-sectional structure are such that the turbulent boundary layer is formed about the dimple at even relatively low velocities without any unnecessary interference being produced at high velocities. Because the cross-sectional structure is seen across the dimple from a plurality of orientations, the boundary layer producing effects of the dimple are directionally independent.

US Patent:

20060093702, May 4, 2006

Filed:

Jul 28, 2005

Appl. No.:

11/191810

Inventors:

Keith Andersen - Hockessin DE, US
John Foltz - Wilmington DE, US
Gilbert Barfield - Carrabelle FL, US

International Classification:

B29C 45/42

US Classification:

425556000

Abstract:

A retractable pin injection molding assembly includes a cartridge comprising a mold cavity, a cavity sleeve to accept water and vacuum lines at the back of the mold, an ejector assembly, and a pin connection block with a groove for a locking slide, so that the cartridge may be changed rapidly without disassembling the injection molding assembly. Also provided is a mechanism for continuously adjusting the length of the ejector pins within the mold cavity.