US PATENT SUBCLASS 110 / 320
.~.~ Adjustable dimension firebox

Current as of: June, 1999
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110 /   HD   FURNACES

317  DF  INCLUDING FIREBOX {1}
318  DF  .~ Having arch {3}
320.~.~ Adjustable dimension firebox

DEFINITION

Classification: 110/320

Adjustable dimension firebox:

(under subclass 318) Apparatus provided with means to vary the size of the combustion chamber either by a vertically movable grate, a movable bridgewall, or a movable dead plate which can vary the effective area of the grate surface.