I had one of these growing up, still have it actually.Mine had been converted to a sturmey 3 speed wheel, pretty handy considering these things are some of the heaviest bikes made. I swapped some trading cards for it at the time
Here it is, a 1976 Fox Chopper. They also made a Silver Fox in two versions of the name Silver Fox.
One was a spring suspension similar to mine but it had a circular chain ring, and was painted silver. The 2nd Silver fox they produced was a muscle bike along with most of the long fork choppers of the day for murray, huffy, Columbia etc.