Play ball
AssigneeDunlop Limited
InventorsRavi Tandon, John G. Schofield
Life of this patent
Estimating the term…
Abstract
The invention relates to playballs, e.g. tennis balls, having a core pressurized with a low permeability gas, e.g. sulphur hexafluoride. Use of such gases can cause the ball to emit a pinging noise on bouncing. The invention provides a core (1) pressurized with gas of low permeability, the internal wall surface (3) of core (1) being profiled by a multiplicity of depressions or protuberances (4), the outer wall surface (2) of the core being smooth. The profiling is preferably in the form of dimples or pimples of circular plan view.
Claims12
A playball comprising a hollow elastomeric sphere pressurised with a gas which permeates through the walls of said sphere slower than air or nitrogen, said sphere including an internal wall surface profiled by a multiplicity of dimples or pimples, and an outer wall surface which is substantially smooth.
A playball comprising a hollow elastomeric sphere pressurized with a gas which permeates through the walls of said sphere slower than air or nitrogen, said sphere including an internal wall surface profiled by a multiplicity of dimples or pimples for reducing or eliminating noise generated within the sphere when said playball is bounced, and an outer wall surface which is substantially smooth.
Dependencies are inferred from the claim text.