Patent ID: 8500076

Claim:
A cup holder fastening structure, comprising: a cup body including a first coupling portion extended from one lateral side thereof, the first coupling portion including a first trough which includes a first spline formed on an inner rim of the first trough and a first hole in a center of the first trough; a fastening means including a strap and a holder; the strap being fastened to an upper end of the holder and containing a latch teeth section on one side; the holder including a slot on the upper end to be threaded through by the strap and a second coupling portion extended from one side of the holder to mate the first coupling portion, the second coupling portion including a second trough corresponding to the first trough; the second trough includes a second spline formed on an inner rim of the second trough and a second hole in a center of the second trough and a plurality of apertures surrounding the second hole; the holder at the lateral side further comprising a housing chamber being opposite to the second trough to hold a stopper; the stopper including a strut and an anchor portion jutting towards the housing chamber, the strut being coupled with a first spring butting the housing chamber; and a pivotal unit including a pushbutton, a pin, a gear cap and a second spring; the pushbutton including a plurality of legs inserting into the apertures of the second trough; the gear cap being located between the first trough and second trough and engaged with the first spline and the second spline, and also including a recess which forms a third hole in a center of the gear cap; the second spring being compressed between the recess and the first trough, the pin running through the first hole, the third hole and the second hole to hinge the cup body on the holder.