Checkerwork supporting means

In a regenerative heating stove embodying a checkerwork having bottom surface means, supporting structure for the checkerwork comprising apertured substantially laterally extending lower supporting means having laterally extending upper surface means;

• laterally extending intermediate supporting means, formed of apertured metal and having upper and lower laterally extending surface means one of which surface means contacts one of said bottom surface means of said checkerwork and said upper surface means of said lower supporting means, said intermediate supporting means being supported by said lower supporting means for limited slidable movement thereon and adapted to support said checkerwork, said intermediate supporting means comprises a single layer of apertured metal and in which the surface means of said intermediate supporting means that contacts said checkerwork is finished substantially more smoothly than the surface means of said intermediate supporting means that contacts said lower supporting means, to reduce friction and permit preferential sliding between at said surface means of said checkerwork and said surface means of between said intermediate supporting means, in comparison to the sliding between the surface means of between said intermediate supporting means and the surface means of said lower supporting means, when dimensional changes occur in said checkerwork and supporting structure because of temperature changes.