Lasted edited by Andrew Munsey, updated on June 15, 2016 at 1:25 am.
This is one of Charles Flynn's patents. As far as I know this patent is still in full force but at least one of his other patents has expiredPatNo.5254925. I'm not familiar with patent law but think he continued it in another patent.
Anyway on to patent number 5,455,474. ''Note: It is not legal to produce this for sale however, you can make it for your own personal/educational use.
This information can be publicly viewed for free at the US Patent and Trademark Office website.patno:5,455,474
The PDF can be downloaded for free from freepatentsonline.com. Thanks to Sterling Allan for the tip.