Abstract: A mounting device for supporting the movable part of a cooling or heating grate, while permitting the movable part to oscillate in the feed direction. The mounting device comprises a plurality of leaf springs connected by transmission members. The upper and lower ends of the leaf springs are alternately attached to transmission members to form symmetrical N-shaped assemblies in which lateral movement is permitted by equal deflections of the leaf springs.

Abstract: An individual key, a stoker incorporating a plurality of the keys, or a furnace incorporating the stoker which includes a key apparatus having a mounting surface dimensioned and configured for sliding engagement with an associated arm, the mounting surface is disposed on the bottom of the key, an upper face receives associated fuel to be burned, a first side having a first contour, and a second side having a second contour. The second contour is different than the first contour. In some forms of the invention the first contour and the second contour are dimensioned and configured for meshing engagement whereby a first side of a first key will mesh with a second side of a second key when a plurality of the identical keys are arrayed in side abutting relationship. The first contour may includes a first lip and the second contour may include a second lip and the the first lip may be disposed at a different elevation than the second lip.