Knock-down heat storage tank

Claim 1

A knock-down tank for containing a liquid medium, comprising: a disassemblable rigid container having a bottom panel, with an inner wall, separate upright side-wall panels having inner walls and upper edges and having lower edges which rest on the bottom panel and having side edges in mutually abutting relationship, and having a top panel overlying said upper edges and closing the container, and having releasable fastener means extending inwardly of the container from the side-wall panels in the vicinity of their abutting side edges and releasably coupled together inside the container to hold the side panels together, the top panel having a hole extending downwardly therethrough; rigid sheets of heat insulating material disposed against the inner walls of the bottom and side panels and having sufficient thickness to cover and conceal said releasable fastener means which extend inwardly of the container; a liquid-containing flexible liner having side walls fitting snuggly within said side panels and having a bottom wall supported by said bottom panel, the walls of the liner lying against said sheets of insulating material and having peripheral flange portions extending outwardly from said side walls and overlying the upper edges of said side panels beneath said top panel; and a dip tube assembly extending downwardly into the liner through the hole in the top panel and supported by the top panel the dip tube assembly providing access to the liquid in the liner.