Patent ID: 6969078

Claim:
A third wheel collapsing device for a golf club cart comprising a main frame, a third wheel support unit releasably assembled with a lower end of said main frame, said third wheel support unit comprising: A U-shaped frame having an opening with a third wheel pivotally connected therein, and an arm extending outward from a closed end, said arm having a center hole in an intermediate portion and plural sidewise holes in its one side a connect base having a hollow interior to fit around said arm, a fitting member extending obliquely from an upper end and provided with an upper inclined surface, a through hole to align with said center hole of said arm, plural locking holes spaced apart in a side for bolts to be threaded into said connect base with said arm firmly, a spring chamber provided in said center hole of said fitting member base for receiving a spring therein an elongate control rod having its lower end connected pivotally with a swingable eccentric plate a lock block positioned on said upper inclined surface of said fitting member of said connect base, having a center hole aligned with said center hole of said fitting member, said center hole having its lower portion formed with a spring chamber for receiving an upper portion of said spring received in said spring chamber of said fitting member, said control rod extending through said center holes of both said fitting member and said lock block and exposed out of said lock block and tightened firmly with a nut said control rod controlled by said eccentric plate, said control rod moved down by swinging up said eccentric plate so that said lock block fixed with an upper end of said control rod may be moved down together and alter its position a little by sliding on the upper inclined surface of the fitting member to let said lock block not be aligned axially with said fitting member, thus said third wheel support unit securely assembled with said main frame by tight contact of said lock block with an inner surface of said main frame when said fitting member with said lock block are inserted in said main frame, said lock block being pushed up by recovered elasticity of said spring in said spring chamber when said eccentric plate is swung down to permit said control rod to be moved up by said spring recovering its elasticity, thus said third wheel support unit together with said third wheel is disassembled from said main frame.