The other end of the link 24 is provided with spaced projections 26, one set of projections being on the outside and the other set of projections being on the inside of the thermostat bar 28, the link 24 extending through an aperture 25 in stack 4 ahd through the opening 27 in the thermostat bar 28, as shown in Figs. The upturned ends of this bar are provided with apertures to receive the cotter pin 23 to which one end of the link 24 is engaged, as shown in Fig. 3, 4, and 5, a U-shaped bar or clevis 22 is affixed to the damper at a position offset from center. The damper is also provided with a small aperture 21 which provides a sufficient down draft to prevent the fire g from becoming completely extinguished even when the damper is secured in a closed position by manual control at night.Ī shown in Figs. The damper 19 is provided 56 with a weight element 20 in the form of a screw which may be of any suitable size to cause a more rapid opening of the damper and also to cause it to fit snugly when closed. The latter are spot-welded at 17 or otherwise affixed to the horizontal ring 13. which latter is supported by the pivot rod 18, which in turn has its ends mounted in the straps 16. The ring IS has a lower flange 15 and raised flange 14 to engage on opposite edges of the circular damper 19. 45 I provide a horizontal ring 13 having an annular depending flange 13a which is secured to the draft stack 4 by the screws 12, as shown in Fig. The envelope 6 is provided with perforations 8 near the upper end through which the screws 8a are inserted, to engage the threaded apertures 9a of the depending flanges 9 of perforated cover plate 5. The upper portion of the draft stack is partly encased by an envelope 6, the arcuate rear portion 1 of which is shaped to seat snugly on the body of the wood heater I, and is secured to it by the bolt I. Referring to the accompanying drawings, I indicates a wood heater substantially elliptical in cross section and having the outlet 2, draft stack elbow 3, draft stack 4 and cover plate 5 with perforations 10. 7 is a bottom plan view of member 5 detached from the heater. 6 is a perspective view of the damper 19 and its supporting rod 18 in an inverted.position, the most of the wall 14 and member 13 being broken away and Fig. 5 is a detail perspective view of the thermostat, link 24 and a portion of damper 19, the major portion of the casing 4 being broken away Fig. portion of the damper being shown in section Fig. 4 is a vertical section through the upper portion of the heater, a. 3 is a top plan view of the device detached from the: wood heater, a portion being shown in horizontal section Fig. I attain these and other objects of my invention by the mechanism illustrated in the accompanying drawings, in whichFigure 1 is a front elevation of my device on a wood heater Fig. The object of my invention is to provide a new thermostatic down draft control for wood burning heaters to provide a thermostat of novel construction to provide novel means f6r manual as well as automatic control of the thermostat whereby a continuous draft may be maintained sufficient so that embers may be kept alive over night and to provide an improved detail of construction as hereinafter described.
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