US1072023A - Draft-regulator. - Google Patents

Description

J. MILTON.

DRAFT REGULATOR.

APPLICATION rum) NOV. 23. 1912 1,072,023. Patented Sept. 2, 1913.

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WITNESSES INIZNY'OR J/uz/ ii /515010 1 Home}? J. MILTON.

DRAFT REGULATOR.

APPLIOATION IILEI) NOV. 23, 1912.

Patented Sept. 2, 1913.

2 SHEETS-SHEET 2.

- \EEEHEM I I mlililm EEEEQEESW all/mm a m N N WITNESSES I INVENTOR 1/0/2122 Maia/0- JOHN MILTON, OF WASHINGTON, DISTRICT OF COLUMBIA.

DRAFT-REGULATOR.

Specification of Letters Patent.

Patented Sept. 2, 1913.

Application filed November 23, 1912. Serial No. 733,114.

To all whom it may concern:

Be it known that 1, JOHN MILToN, a citizen of the United States, residing at WVashington, District of Columbia, have invented certain new and useful Improvements in Draft-Regulators, of which the following is a specification.

My invention relates to certain new and useful improvements in draft regulators, particularly adapted for use upon locomotive and other boilers having an extension front into which the cylinders exhaust.

The object of my invention is to produce a simple and light construction which shall be cheap to manufacture, light and highly efficient in controlling the tendencies of heavy exhausts, which tend to lift the fire in grate bars, producing holes therein and also drawing the fire through the tubes into the front and preventing proper combustion.

With these and other objects in view my invention consists in certain constructions, combinations and arrangement of parts, the preferred form of which will be first described in connection with the accompanying drawing, and then the invention particularly pointed out in the appended claims.

Referring to the drawings wherein the same part is designated by the same reference numeral wherever it occurs, Figure 1 is a front elevation of a portion of the front end of the extension front of a locomotive equipped with my invention; Fig. 2 is a section taken on line 2, 2 of Fig. 1, looking in the direction of the arrow; Fig. 3 is a central vertical section through Fig. 1, showing the valve closed; Fig. 4: is a similar view showing the valve opened by the force of the exhaust, and Fig. 5 is a view similar to Fig. 4, showing however the valve when opened automatically by air pressure in the valve controlling cylinder. 1

10 designates the extension front or smoke box having the usual opening therein which, however, instead of being closed by a cover, has seated therein a plate 11 secured in position by bolts 12. This plate is provided with an opening 13 therein which, preferably, and as shown, is of a generally semicircular form, and on the interior is provided with an inwardly extending beveled flange 14: and a valve seat 15. At one side of the opening, preferably the central portion of the bottom, I provide an inwardly projecting semi-circular boss 16 formed on the exterior with a semi-circular depression 1 7, between the ends of which extend the pivot pin 18, on which is mounted a sleeve 19 carrying a curved arm 20, terminating in a portion 21, to the inner face of which is secured the semi-circular plate 22 that forms the valve, the periphery of which is adapted to seat against the valve seat 15 and close the opening 13 against the passage. of air into the smoke box. It is essential that this valve remain closed until the exhaust is of a predetermined strength and that it then open increasing amounts as the strength of the exhaust increases beyond a predetermined amount. It is also essential that this valve be open wherever the fire box door is open, in order to prevent cold air being drawn in through the door in large amounts by the force of the exhaust. In order to thus control the operation of the valve I provide mechanism which will now be described.

Mounted on the plate 11, preferably between the pivot 18 and the opening in said plate, is a bracket 23 carrying a cylinder 24-, closed at its lower end by a head 25, through which extends a pipe 26 adapted to be con nected to a suitable source of air supply controlled by any suitable valve mechanism operated by the door, one form of said door operated valve mechanism being shown in my Patent No. 1,031,458, patented July 2, 1912, it being understood however that any other form of door operated mechanism may be substituted for that shown in said patent, if desired. Mounted in the cylinder 24 is a piston 27 adapted to he moved away from the head 25 when air pressure is introduced through the pipe 26. The upper end of the cylinder 24 is closed by a cap 28, threaded onto the end of the cylinder 21, and through this cap extends a rod 29, recessed at its lower end to receive the projecting stud 30, carried by the piston 27, and to guide and retain said piston in true vertical alinement. Mounted on the rod 29. between the head 28 and a collar 31 secured to the lower end of the rod 29, is a coil spring 32.

From the foregoing description it will be seen that when sufficient air pressure is admitted to the cylinder 24, below the piston 27, the piston will be forced upwardly carrying the rod 29 upward, and also that a pull on the upper end of the rod 29 of sufficient strengthto overcome the tension of the spring 32, will cause it to move upwardlywitho'ut, however, moving the piston. The force necessary to move the rod 29 can be adjusted by adjusting the head 28 on the cylinder 24, to increase or decrease the tension of the spring 32. Mounted on the upper end of the rod 29 is across bar 33, on the outer ends of which are mounted the links 3 1 connected at their lower ends to arms 35 formed on the sleeve 19. When, therefore, the piston 27 moves upwardly under air pressure admitted to the cylinder,

the valve will be opened through the medium of the cross head 33, the links 34, the arms 35, the sleeve 19 and the arm 20, and that the opening of the valve 22 by the force of the draft will, through the same connection, move the rod 29 and compress the possible in the details of construction and arrangement of parts without departing from the splrlt of my invention, and I therefore do not intend to limit myself to the specific form shown and described.

Having thus described my invention what I claim as new and desire to secure by Letters Patent is:

1. A steam boiler furnace having a smoke-box into which the engine exhausts provided with an opening, a plate provided with an opening and seated in the opening in the smoke-box and having a valve seatin the periphery of its opening, a plate valve adapted to seat in the last-mentioned open ing, an arm extending from the valve, a

pivot for said arm, a relatively short arm extending from said pivot, fluid pressure valve-opening means connected to said last mentioned arm said means being provided with a spring for normally holding the valve in closed position, all of said valveoperating parts being located on the exte rior of the smoke-box.

2. A steam-boiler furnace having a smoke-box into which the engine exhausts, said smoke-box being provided with an opening substantially flush with the wall of the smoke-box, a fiat plate valve adapted to seat in the opening and close the same, the smoke-box being provided with a depression adjacent the opening therein, a

pivot-pin mounted in said depression, an arm extending from the valve on the exte- V rior side thereof and journaled on the pivot pin, and spring actuated means also located on the exterior of the smoke-box connected to said arm, and tending to hold said valve closed.

3. A steam-boiler furnace having a smoke-box into which the engine exhausts, said smoke-box being provided with an opening, a plate also provided with an opening seated in said first-mentioned opening, a valve seat formed in the periphcry of the opening in the plate, a fiat plate valve adapted to seat in the last-mentioned opening and close the same, an arm extending from the valve, a sleeve carried by said arm, a relatively short arm extending from said sleeve, a cross head, a piston movably connected to said cross head, a cylinder in which the piston is mounted, a spring opposing the movement of said cross head in one direction, and a pair of links connecting said cross head with the arm on the sleeve, all of the operating parts of said valve being located on the exterior of the smokebox, substantially as described.

In testimony whereof I my signature in presence of two wltnesses.

JOHN MILTON.

Witnesses F. L. BROWNE, JOHN L. FLETCHER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. e.

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