USRE1671E - Improvement in draft-regulators - Google Patents

Description

J. BRIGGS. Damper.

Reissued May. 17, 1864.

. UNITED STATES PATENT OFFICE.-

J'OHN BRIGGS, OF ROXBURY, MASSACHUSETTS.

IMPROVEMENT IN DRAFT-REGULATORS.

Specifieat-iOn formingpart of Letters Patent No. 41,598, dated February 16, 1864.; Reissue No. 1,671, dated May i7, 1874.

To all whom it may concern:

Be it known that I, JOHN BRIGGS, of Roxhury, in the county of Norfolk and State of. Massachusetts, have made a new and useful invention for Regulating the Draft of Stoves, Furnaces, 850.; and I do hereby declare that the following, taken in connection with the drawings which accompany and form part of this specification, is a description of my invention suflicient to enable those skilled in the art to practice it.

My invention relates principally to the regulation of the currents of air supporting comtight drums or boxes, having flexible or expanding heads, which shall expand or contract by the increase or diminution of heat from the stove, one or moreof such heads being connected to and operatin g the valves or dampers of the heating apparatus, as I will proceed to describe.

The drawing illustrates my invention as applied to a common hot-air furnace, the general construction-and operation of which, being well known, need not be described. 7

a denotes the inlet, and b the outlet, passages, the former having a valve, 0, to regulate the induction of air to support combustion,

- and the latter being provided with a valve, d, and either or both of these valves may be used,

as may be deemed necessary, or a common damper may be substituted for the valve a. Over the hotair chamber of the furnace, or in any other suitable position with respect to the furnace, and so as to be efi'ected by the heat therefrom, I place an air-tight drum, 0. This drum is made shallow in depth, and with a large end-surface, as seen in the drawings, the heads f 9 being flexible or capable of being easily collapsed or expanded. The contracted or shallow form given to the drum causes a large surface to be exposed to the heat from the stove, which heat quickly expands'the air within the drum and forces outward the heads thereof. A disk or shallow drum, It, may rest upon the furnace for supporting the drum e, and a conical or tapering box, 1', is placed on top of the drum, as sern in the drawing. A lever, 70, passes over and rests upon the top of this cone, the lever being atfixed to or connected with the cone in any suitable manner, or merely resting thereupon. One end of this lever is supported on a stationary rod, 1, while the other end has depending from it a rod, m, which is attached at its lower end to the inlet-valve 0. Another lever, a, turning upon a fulcrum, 0, also rests upon the top of the cone, and has a I( d, p, extending from its outer end to the flue-valve d. Either or both these levers may be used as circumstances may require. A spring, q, and a stop and guide-rod, s, are shown in connection with one of the valves, which devices .may be used to limit the extent of vertical movement of the valve, while the rod 8 also serves to guide the valve or keep it from rotating. A simple standard may be placed on the drum e, instead of the cone 6, for the levers to rest upon, or so that the'action of the drumhead shall actuate the levers.

The operation of the invention is as follows: The heat from the stove, as it strikes the adjaccnt head of thedrum, expands the inclosed air and drives the heads outward. This lifts the cone or standard on top of the drum, which actuates the levers la n and lifts the valves 0 (1. Raising the valve 0 closes or diminishes the draft-openings, which diminishes the supply of air to the fire and the heat thrown otf thereby, while a similar result is effected by raising the valve (1, which opens the passages into the flue. As the heat diminishes, the

drum-heads draw together, letting the levers and valves down again, opening or enlarging the draft-openings, and closing the flue-openin gs. Adjusting screws and nuts being placed on the valverods, by a slight attention to ad justment of the valves when the drum is first.-

applied to the stove, the arirangement of the drum and levers enables the air of the room to be kept at a very oven temperature, neither allowing it to get too hot or too cold. It not only insures a uniform and healthy temperature, but it efi'ects a great saving of fuel, and the coal is never melted.

The invention is simple and inexpensive, andisentirely self-regulating, requiring no care, and giving no trouble or inconvenience such as is encountered in the use of fluid-regulators, which have been heretofore to some extent employed.

The head of the drum may be directly connected with the valve or valves of the heating apparatus without the intervention of the lever, though I prefer to use a lever, substantiallyas shown.

The sensitiveness of the inclosed air to expansion and contraction from heat renders the apparatus much better adapted to its purpose than are rods and other similar contrivauoes which have sometimes been used to operate the valve and dampers of stoves, furnaces, &c.,'by their expansion and contraction, consequent upon changes of temperature.

Any desired amount of movement necessary to WOILk the valves may be obtained by modification of the leverage or by modifying the area and flexibility of the drumheads or by the employment of several flexible headed drums in combination.

I claim- The employment of a flexible-headed airtight drum connected with and operating the valves or draft-passages of a heating apparatus, substantially as set forth.

JOHN BRIGGS.

Witnesses:

F. GOULD, S. M. MolNTiRE.

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