Патент USA US2127288код для вставки
Aug. 16, 1938. T. J. coLlHAN \ 2,127,238 DRAFT REGULATOR Filed Nov‘. 19, 1957 4/ ' 2 Sheets-Sheet 1 I I /. (J3 ' 4" Inventorv 600/7607 /I/ ' By l M 5m Attorneys Aug. 16, 1938. T_ J‘ COUHAN " ' 2,127,288 DRAFT REGULATOR Filed Nov. 19, 1957 2 Sheets-Sheet 2' Inventor m 5% Attorneys Patented Aug. 16, 1938 2,127,288 UNITED STATES PATENT OFFICE 2,127,288 DRAFT REGULATOR Thomas J. Oolihan, Girardville, Pa. Application November 19, 1937, Serial No. 175,525 1 Claim. My invention relates to improvements in draft regulators for use on boilers, more particularly locomotive boilers. The invention is designed with the particular 5 purpose in view of providing a practical, inex pensive means of simple construction adapted to be readily attached to the smoke box of a loco motive for operation under the blast of the ex haust passing therethrough to break the pull, or 1 lift, in the ?re box incident to the rush of the exhaust through the smoke box, and thereby ob viate undue suction in said ?re box such as would tend to draw flames and sparks therefrom through the boiler ?ues. To the accomplishment of the above, and sub 15 ordinate objects presently appearing, a preferred embodiment of my invention has been illustrated in the accompanying drawings, set forth in detail in the succeeding description, and de?ned in the 20 claim appended hereto. In said drawings— Figure 1 is a fragmentary view in vertical longitudinal section of a locomotive boiler having my improved draft regulator applied thereto, 25 Figure 2 is a view in front elevation, Figure 3 is a View in vertical transverse section taken on the line 3-3 of Figure 1 looking in the direction indicated by the arrows, and ' Figure 4 is a View in perspective of a bracket O 3 (Cl. 236-45) the aperture 8, is a circular closure plate l8 of sufficient diameter to close said aperture. Pref erably the plate I8 has formed thereon guide sleeves I9 through which the rods I4 and I5 ex tend and which prevent said plate from binding on said rods. The plate I8 is yieldingly urged against the inner side of the front plate 5, in closing position, by means of a tension spring 20 having its opposite ends secured to a pair of eye bolts 2| and 22 secured in the center of the plate 10 and said breast bar I 0, respectively, as by nuts 23. As will now be seen the device described forms a valve in which the closure plate I8 is the valve member tensioned by the spring 20 to seat 15 against the front plate 5 and close the valve opening 8 and so that when the exhaust steam blasts through the smoke box 4 the .suction created therein by the blast will pull the plate I8, or valve member, into opening position in oppo 20 sition to the spring 20 and admit air to the smoke box 4. As will be understood the air thus admitted to the smoke box 4 will break the suction created in the ?re box, by way of the lines 2, under such action of the exhaust steam, and thereby obviate the discharge of sparks from the smoke stack 6 also the formation of holes in the ?re bed. The heads IT on the forming part of the device. Referring to the drawings by numerals, my rods I4 and I5, as will be manifest, establish the limit of opening movement of the plate I8, or 30 valve member, as shown by dotted lines in invention has been shown therein as applied to a locomotive boiler I including the usual flues Figure 1. 2, front ?ue plate 3, smoke box 4 having the front plate 5, smoke stack 6 and the usual exhaust pipe 1 leading from the cylinders, not shown, into the smoke box 4. , According to my invention, a circular aperture 8, of any suitable size, is provided in the front 40 plate 5 axially thereof and for the admission of atmospheric air into the ?re box 4. A U-shaped bracket 9, of right angles form and of suitable metal, and comprising a breast bar I0 and right angled legs I I is secured to the plate 5 in upright position, in the center of the aperture 8, by 45 means of bolts I2 extending through said legs and plates and having nuts I3 threaded on to the ends thereof. Extending inwardly, equi distantly from the breast bar Ill through said aperture 8 and into the smoke box 4, for a suit 50 able distance, is a pair of upper and lower, hori zontally disposed guide rods I4 and I5, each se cured at its front end in said breast bar ID by means of a pair of nuts I6 threaded thereon upon 55 opposite sides of said bar II] respectively. The guide rods I4 and I5 are each provided on their inner ends with a head I'I. slidably mounted on the guide rods I4 and I5, on the inner side of The invention will, it is believed, be readily understood from the foregoing without further explanation. Manifestly, modi?cations in structural fea tures described may be resorted to without de parting from the inventive concept and right is herein reserved to- all such modi?cations falling within the scope of the subjoined claim. ' 35 40 What I claim is: A draft regulator for use on a boiler smoke box of the type having a draft opening therein, said regulator comprising a U -shaped bracket adapted to be secured to the outer side of said box and to span said opening, a pair of guide rods extending from said bracket and adapted to extend through said opening into said box, a closure plate slidably mounted on said rods and adapted to be disposed in said box for movement 50 on the rods into and from closing relation to said opening, a tension spring connected atits oppo site ends to said plate and bracket to urge said plate toward closing relation, and stops on said rods for limiting movement of the plate thereon 55 from closing relation. THOMAS J. COLIHAN.