Richard To Choi

US Patent:

6443850, Sep 3, 2002

Filed:

Feb 1, 2000

Appl. No.:

09/495718

Inventors:

Richard Wonsik Choi - Los Angeles CA 90045

International Classification:

A63B 5306

US Classification:

473224, 473257, 473312

Abstract:

A golf swing training device comprising a golf club having a head, shaft and grip and a piston assembly housing is disposed in the club head. A piston is disposed in the housing and is movable therein in a direction parallel to the shaft of the club. A spring loaded detent acts against the piston to retain it in an upper position in the housing. Air vents in the top and sole of the club head communicate with the interior of the housing to maintain atmospheric pressure within the housing and to prevent any resistance against the piston which would be caused by compressing air in the housing. As the club is swung the speed of the club head generates centrifugal force that, if sufficient, overcomes the retaining force of the detent and allows the piston to move downward in that housing toward the sole of the club. When the piston strikes a floor of the housing an audible click can be heard. An adjuster knob has a threaded shaft that acts against the spring to compress it against the detent ball urging the detent ball into the annular groove of the piston to secure the piston in the up position.