US Patent 7194842 Portable observation tower

A portable structure from which hunters and wildlife observers can command elevated views of wildlife habitat. Commonly called a blind, it can be constructed as a stand-alone structure and transported intact to habitat sites on, for example a flat-bed truck. It can also be constructed as a trailer, or as a permanent or semi-permanent attachment to a motorized vehicle. The blind offers powered erection, powered access to and from the observation position, and wheelchair accessibility.