Патент USA US2133803код для вставки
0m. 18, 1938. M. K. BRADY ' 2,133,803 DRAFT REGULATOR Filed May 6, 1937 //V V5/V 7'01? Meme/L1. BRADY, ) Patented Oct. 18, 1938 2,133,803 UNITED STATES PATENT’ OFFIQE 2,133,303 DRAFT REGULATOR Merrill K. Brady, Kirkwood, N. J. Application May 6, 1937, Serial No. 141,124 1 Claim. As hereinafter described, my invention in cludes an annular frame in which a damper plate is pivotally' mounted so as to normally close an opening through said annular frame by gravita 5 tion of said plate, and the essential feature there of is speci?c means including a weight which may be shifted in an arc of a circle with respect to the damper plate axis of the pivot of 10 gravitative effect of tending to close it in toward and away from the the plate to thus vary the the weight upon the plate said frame. . My invention is particularly applicable for controlling the in?ux of atmospheric air to a ?ue leading from an oil burning furnace‘ to a 15 chimney to admit more or less air to said ?ue in accordance with the ?uctuations in natural convection draft of the ?ue and chimney. How ever, it is applicable to any other embodiment in Which it is desired to regulate ?uid pressure or 20 exhaust upon one side of the regulator by admis V25 sion of ?uid from the opposite side. My invention includes the various novel fea tures of construction and arrangement herein after more de?nitely speci?ed. In said drawing: Fig. I is an elevation of a convenient embodiment of my invention inserted in a ?ue pipe. Fig. II is a vertical sectional view of the struc ture shown in Fig. I taken on the line II, II, in 30 the direction of the arrows in the latter ?gure. Fig. III is an elevation of the inside of the reg ulator shown in Figs. I and II; the ?ue pipe shown in Figs. I and II being omitted. In said ?gures; the annular frame I, which 35 is conveniently formed of cast metal, is circular at its perimeter, which includes the rim ?ange 2 which abut-s against the end of the ?ue pipe 3, as shown in Fig. II. The perimeter of said an nular frame I also includes the circular ?ange II, 40 which as shown in Fig. II is slightly tapered in ward with respect to said ?ue pipe 3, to facili tate the introduction of the annular frame into said pipe in the position shown in that ?gure. In order to readily secure said annular frame 45 I in said ?ue pipe 3, I ?nd it convenient to pro vide the latter with the outwardly extending bead 3', conveniently formed by a rolling opera tion and to provide the ?ange 4 of said annular (Cl. 236-45) . by the screw 5’ in Fig. II, to thus readily, rigidly connect said annular frame I with said pipe 3. The outer portion of said annular frame I is also inclined inwardly as indicated at 9 in Fig. II, v I to facilitate the passage of'airthrough said an- . - nular frame I, to the interior of said pipe 3. Said annular frame I has ‘the arcuate inwardly extending stop?ange III at the lower portion thereof and the arcuate inwardly extending stop ?ange II at the upper portion thereof; said stop 10 ?anges being in axially offset relation, as shown in Fig. II, to contact with opposite sides of the damper plate I3. Said plate is conveniently formed of thin pressed sheet metal having a cylindrical rim ?ange I3’, to stiffen it. Said l5_ plate is hung upon the pivot wire I4 which ex tends horizontally above the horizontal diameter of said plate I3, through opposite sides of said ?ange I3’ on said plate and has its opposite ends respectively ?tted in bearing lugs I5 projecting 20 from said annular frame I. Washers I6 are in terposed between the inner circumference of said annular frame I and the ?ange I3’ of said plate I3 to center the latter in the opening through said annular frame so that it is free to oscillate 25 upon said pivot wire I4 and normally gravitates into vertical position, shown in Fig. II. I ?nd it convenient to provide the stop ?ange III with an inwardly extending lug I 0’ to support the pad of resilient material I8 which is conveniently ce- 30 mentedvto said lug III’ to receive the impact of the lower edge of said plate I3 noiselessly. . Said pivot wire I 4 has the pendant bight I4’ in termediate of its length to ?t around the screw bolt I9 which extends through said plate I3 and 35 serves to prevent endwise movement of said wire I4, with respect to said annular frame I. Said bolt I9 has the handle head 20 permanently rigid ly connected therewith; said head being conven iently formed of readily fusible metal, for in- 40 stance, aluminum, cast upon said bolt. The op posite end of said bolt I9 extends through the radial arm 22 of the weight 23 and is rigidly con-‘ nected therewith by the nut I9’. Said bolt I9, which otherwise would be free for axial and ro- 45 tary movement with said weight .23 in said plate I3 is adapted to be readily ?xed in different an gular positions with respect to said plate I3, by frame with three lugs respectively indicated at 5, means of the milled nut 24 engaged with said 50 6, and 1, each respectively provided with set bolt I9 and bearing upon the washer 25 which en- 50 screws 5', 6’, and ‘I’. Said set screws are re— circles said bolt I9, in contact with the outer tracted when it is desired to introduce said an face of said plate I3. nular frame I into the position shown in Fig. II ' It is to be understood that the arrangement and thereupon each of the screws is adjusted out above described permits said weight 23 to be 55 wardly to engage within said bead 3' as indicated readily manually adjusted, by the handle 20. in an 55 2 r 2,133,803 are with respect to said plate I3, from a position parallel with said pivot wire M, in which it has the least gravitative effect, to a position at right angles to said wire M, in which it has the greatest gravitative effect, to thus oppose more or less re sistance to oscillatory displacement of said damp er plate I3, from its normally closed position shown in Fig. II. Such adjustment is effected in accordance with the strength of the draft in the 10 pipe 3 which is a branch of the ?ue pipe extend ing from the furnace to the chimney; so that the gravitative effect of said weight 23 upon the damp er plate [3 may be increased in correspondence with increment in the force of the draft tending to 15 open said damper plate I3 inwardly with re-' spect to the ?ue pipe 3 and thus regulate the ef fect of such draft upon the oil burner or other source of heat in the furnace to insure that the volume of atmospheric air drawn into the furnace 20 by the draft in the ?ue shall be such as to effect satisfactory combustion of the fuel. Although I find it convenient to secure my im proved regulator in connection with the ?ue pipe by means of the set screws above described, en 25 gaging within the bead as shown in Fig. II; it may be secured by such screws in a ?ue pipe which is not provided with such a bead, and mere ly by pressure upon the inner cylindrical surface of the pipe. Moreover, any other convenient 30 means for securing the regulator frame inthe desired position may be employed. Therefore, I do not desire to limit myself to the precise details of construction and arrangement herein set forth as it is obvious that various modi ?cations may be made therein without departing from the essential features of my invention as de ?ned in the appended claim. I claim: In a draft regulator, the combination with an annular frame, of a substantially plane damper plate pivoted in said frame, above its center of gravity, and thus adapted to normally gravitate to position to close the opening of said frame; of a screw threaded member extending through 10 said plate, intermediate of its width and approx imately at the axis of its pivot in said frame, hav ing at one end a radially extending handle out side of said plate and having at its other end a radially extending weight pendent at the inside 15 of said plate; said screw threaded member and its appurtenances having freedom of movement for adjustment in an arc of a circle with respect to said plate; and a nut on said screw threaded member accessible from the outside of said plate; 20 whereby, said weight may be adjusted from hori zontal to vertical position to vary its gravitative effect upon said plate from miniumm to maximum and be temporarily rigidly secured in any‘adjusted position, by said nut; the pivotal support for the 25 damper plate comprising a wire extending hori zonally above the center of gravity of said plate, into bearings in‘ said frame at its opposite ends, said wire having a 'bight intermediate of its length partly extending around said screw 30 threaded member; whereby said member pre-' vents longitudinal displacement of said wire. MERRILL K. BRADY.