| CPC A63B 60/04 (2015.10) [A63B 53/02 (2013.01); A63B 53/0466 (2013.01); A63B 2209/00 (2013.01)] | 13 Claims |
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1. A golf club, comprising:
a hollow shaft having a proximal end and a distal end forming a shaft chamber therebetween;
a grip secured to the proximal end of the shaft;
a hollow club head coupled to said distal end of said shaft, said club head having a club head chamber fluidly coupled to said shaft chamber, said club head defining a striking face;
an adjustable check valve assembly positioned within said shaft chamber, said check valve assembly comprising:
an expandable sleeve having an outer wall frictionally engaging an inner surface of said hollow shaft;
a valve chamber having an upper section and a lower section, said upper section including a threaded external surface constructed and arranged to engage said expandable sleeve, said lower section having a frusto-conical shape leading to a centrally disposed aperture;
a check valve conforming to said frusto conical shape, said check valve constructed and arranged to seal said aperture in the presence of a vacuum within said chamber;
a stationary plate having an outer edge sealingly securable to said valve chamber, said stationary plate having a centrally disposed passageway and at least one vent hole;
a safety lock member threadingly engaging said valve chamber with a locking arm extending through said stationary plate passageway for securing said check valve in said valve chamber aperture; and
a fluent liquid weight medium disposed within said chamber;
wherein the chamber of the said shaft and club head is evacuated of air wherein said check valve maintains the vacuum created and said safety lock member further secures said check valve in a position to prevent loss of the vacuum;
whereby, during a golf swing, said fluent liquid weight medium is displaced from a first position within said shaft to a second position within said club head to increase the mass at the striking face during impact with a golf ball, and is displaced from the club head back toward the shaft during a backswing to reduce inertial resistance, thereby enhancing swing efficiency and increasing the resulting distance of golf ball flight.
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