US22820A - Variable-exhaust pipe - Google Patents

Description

J. PATRICK. VARIABLE EXHAUST PIPE.

No. 22,820'. Patented Feb. l, .1859.

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UNITED STATES PATENT OFFICE.

JONES PATRICK, OF CHICAGO, ILLINOIS.

VARIABLE-EXHAUST PIPE.

Specification of Letters Patent No. 22,820, dated February 1, 1859.

T 0 all whom ttmwy concern:

Beit known that Il, JONES PATRICK, of the city of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Machine for Regulating and Varying the Exhaust in High-Pressure Steam- Engines; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, making a part of this specification, andf to the letters of reference marked thereon, of which drawings-Plan No. l

shows a front elevation as fixed for use in the smoke chamber of an ordinary locomotive engine. Plan Nos. 2 and 3 show a top View of the same as fixed in said smoke chamber. tion, with a similar section of a portion of the exhaust pipes of an engine to which the same is affixed.

The nature of my invention, consists in the manner in which I combine, the rotating cylinder of adjustable exhaust openings, with a mechanism in convenient position to the engineer or fireman, for the purpose of insuring the turning of said cylinder or plate, and thus increase or diminish the area of exhaust opening at pleasure.

To enable others to make and use my invention, I will describe its construction, and operation.

In any high pressure steam engine, when it is desired to increase the force of the fireblast by allowing the exhaust steam to escape into the smoke chamber, or smoke stack, where the end or ends, of the exhaust pipe or pipes open into the smoke chamber or stack, or when the exhaust steam is in any way caused to escape, through t-he smoke chamber or smoke stack for the purpose of increasing the fire-blast, I aflix to the said end or ends (as the case may be) an immovable plate of brass, iron, or any other proper material, so perforated that the end or ends of such pipe or pipes shall pass through it and form a perfectly plane surface therewith; this plate I shall designate as plate B. (See plan of plate B in drawing.) It is to be of sufficient thickness and body, to give it a firm hold of the pipe or pipes, so as to serve as a support for plate A hereafter to be described. In order to secure freedom from clogging by dust, cinders, &c., plate B may be perforated by as many holes of the same or varying sizes as Plan No. 4:; shows a vertical secshall be deemedl desirable in any particular case. Resting upon the plate B, a second plate A is to be placed (see plan of plate A in drawing)` B being designed merely as a supportfor A. The two plates may b-e connected by means of a bolt` G passing through their centers, and so contrived as to admit of the easy revolution of A, thereon on its axis. The surfaces of A `and B thus brought in contact are to be ground and polished so as to make as nearly as possible, a steam-tight joint. I perforat-e plate A with two or more holes, of varying sizes for each exhaust pipe, the said holes being` so arranged, as that by the revolution of A upon its axis, said holes may be consecutively brought over thel orifice or orifices of the exhaust pipe or pipes atthe will of the personV having charge of the working of the engine. These holes, or pairs of holes, in plate A may vary from the full size of the orifice of the exhaust pipe, to such smaller sizes as shall be deemed needful for the purpose of varying the exhaust; and the number of holes, or pairs of holes, and consequent number of variations in the exhaust, the mechanic may determine for himself accord-ing' to the circumstances of any given case. I would recommend however, that not less than three sizes of holes be used.

Plate A may beof any convenient thickness; but if less than six inches, I would recommend that pipes or petticoats be inserted in each hole, closely tt-ing thereto, of suiiicient length tomake up at least that amount of tubing for the passage of the exhaust steam. I would also recommend that the holes in plate A, on the side coming in contact with plate B be equal in size with the orifices of the exhaust pipes; and that the variations i'n the sizes of the holes in plate A, be made by tapering the same, or the tubing before mentioned, to the upper opening of said holes in plate A, as byso doing amore perfect exhaust will be obtained, and there will be less liability to leakage.

Plan No. 4.- is a vertical section of one of my machines, calculated for an engine with two exhaust pipes, and showing a vertical section of a portion of the exhaust-pipes. A is the revolving plate; Gr the bolt by which A is connected with B, and upon which A turns, as its axis. B is the plate fastened to the exhaust pipes, and which serves as a support to A. C, C, are the exhaust pipes. The holes through plate A are shown by the letters D, E, and F in Plans Nos. 2 and 3, and also in the top view of A in Plan No. 5. Plans Nos. 7 and 8 and 9, show vertical sections of A, cut -through the various sized holes D, E, and F; while plan No. 6 shows a bottom view of plate A, and it is intended by plans Nos. 5, 6, 7, 8 and 9 to illustrate what I have said above as to the conical or tapering shape of the holes through plate A. All this being done it will readily be seen that by revolving plate A, in such manner as to bring a different sized hole over the orifice or orifices of the exhaust pipe or pipes, the engineer can, at will, change the force of the exhaust into the smoke chamber or stack, and thus regulate and vary the power of the fire blast. Control of the plate A, may be given to the engine-man by means of a lever and ratchet, a screw and worm, a rack and pinionmor any other mechanical application which can be used for that purpose. To t-urn this plate or cylinder in which the various sized openings D, E, F, are, from the outside and with certainty, I arrange as follows: On the shaft a, there is fastened an arm b, to which one end of a connecting rod c is pivoted, the other end of said rod (as more distinctly seen in Figs. 10 and ll) being pivoted to the head of a double pawl or claw Z- which in turn is pivoted to the end of a radius bar f, hung at the center of the turning plate or cylinder of openings D, E, F. e', z', &c., are grooves cut in the perimeter of the plate A, and open so that no dust or ashes can lie in them; these grooves serve as a ratchet for the arm e of the pawl CZ, to work in.

The operation of this mechanism is as follows: By turning the shaft a, in the proper direction, the pawl is tipped over on its hinged joint, as seen in Fig. 10, so that its arm e is raised up clear of the grooves z',

while its other arm e', runs on the flange under the grooves, and thus prevents it from tipping too far, Near the end of the stroke of the connecting bar c, said bar comes in contact With the arm (or pawl proper) e, and throws it down upon the plate A, as seen in Fig. l1, so that it willv take the first notch or groove z', on its return motion, and holding therein draw the plate around a sixth of a revolution when six holes are used as I represent them-more or less, if more or less than six holes are used. Thus the plate or cylinder of holes can be turned at pleasure and with certainty, when it is desired to change the area of exhaust opening.

It is necessary, as before stated, that t-he cylinder or plate A, should move easy on the plate B-Fig. No. Ll, but still make a close jointwvith it. For this purpose the two are held together by a screw g, upon the neck of which the cylinder or plate A turns. This same screw also holds the radius bar and to prevent said'radius bar from bending by the tightening of the screw, a sleeve or thimble is put inside of the opening of the radius bar, which projects slightly, so that the tightening comes upon the ends of said sleeve or thimble and leaves the radius bar free to turn by the action of the pawl..

Having thus fully explained the nature and object of my invention, what I claim therein as new and desire to secure by Letters Patent is- In combination with a revolving cylinder or plate of variable size exhaust openings, the rock shaft pawl, radius bar, and their several. connections, substantially in the manner, and for the purposes set forth.

JONES PATRICK.

IVitnesses T. E. CHANDLER, IVM. GAY SWAN.

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