US1123108A - Draft-regulating device. - Google Patents

Description

F. M. DAVIDSON.

DRAFT REGULATING DEVICE.

APPLICATION FILED 001 .41 1912.

1,123,108, Patented Dec.29,1914.

lnE NORRIS PETERS CD11 PHOTO-LITHa, WASHINGTON, D. Cv

FRANK IVI. DAVIDSON, OF KIRWIN, KANSAS.

DRAFT-REGULA'IING DEVICE.

Specification of Letters Patent.

Patented Dec. 29, 1914.

Application filed October 4, 1912. Serial No. 723,932.

To all whom it may concern Be it known that I, FRANK M. DAVIDSON, a citizen of the United States, residing at Kirwin, in the county of Phillips and State of Kansas, have invented new and useful Improvements in Draft-Regulating Devices, of which the following is a specification.

This invention relates to draft regulating devices and the object of the invention is the provision of simple and efficient mecha nism for controlling the exhaust from the cylinders of the steam engine so that instead of carrying all of the exhaust out through the smoke box and smoke stack, a portion of it may be deflected direct to the atmosphere, whereby the draft may be reduced or increased, as desired. This results in many advantages, such as reducing the draft to a minimum when the furnace door is open so as to avoid relatively large and sudden changes in temperature which produces leaky lines and cracked fire box sheets. A device of this character also permits of considerable reduction in the fuel consumption.

Further objects of this invention will appear as the following specific description is read in connection with the accompanying drawing, which forms a part of this application, and in which Figure 1 is a side elevation. Fig. 2 is a sectional view through the controlling valve.

Referring more particularly to the draw ing, 1 represents an ordinary traction engine boiler having the steam cylinder 2 mounted thereon and connected to the exhaust chamber 3 by a pipe 4:. A pipe 5 leads out of the exhaust chamber and is in communication with the exhaust nozzle 6 arranged in the smoke box and adapted to direct the exhaust steam to the stack 7. The pipe 5 includes a Tunion 8 which is connected to a valved casing 9 by a pipe 10. The valved casing has mounted therein and in an extension 11 thereof, a valve seat member 12 provided with a board 13 controlled by a slide valve 15. One end of the casing is closed by a plug 16 and the opposite end of the casing has attached thereto the extension 11 which has its end closed by a plug 17 provided with a packing gland 18 through which the operating rod 19 passes. This operating rod is connected to the slide valve 15 and has a rack 20 adjacent its outer end adapted to engage a bearing 21 for holding the valve in adjusted position. The terminal of the rod 19 is formed into an operating handle 22. The opposite side of the casing from the pipe 10 has secured thereto a pipe 23 which leads directly to the atmosphere.

In the operation of the device when it is desired to decrease the draft the valve is shifted to the position shown in Fig. 2 which permits a certain amount of the exhaust steam from the tank 3 to escape through the valve casing and pipe 23 to the atmosphere. IV hen maximum draft is required the valve is thrown to closed position and locked in such position by the rack 20 engaging the bar 21.

What is claimed is 1. In a valve structure for draft regulating devices, a casing having alined inlet and exhaust passages therein, a sleeve carried by the casing and arranged at right angles thereto, and an elongated member arranged within the sleeve and having one of its ends extending into the casing, the said member having its upper surface flat, the said extending end of the member having an opening extending transversely therethrough and registering with the exhaust passage, a

valve slidably arranged within the casing and the sleeve and having a fiat under surface engaging the flat upper surface of the member, the said valve being operable over the opening in the member, whereby to control communication between the inlet and exhaust passages, and means for operating the valve.

2. In a valve structure for draft regulating devices, a valve casing having inlet and exhaust passages therein, a sleeve carried by the casing, a member removably arranged within the sleeve and having a flat upper surface, the said member having one of its ends extending into the casing and having an opening registering with the exhaust passage, a valve slidably mounted upon the upper surface of the member, and operable over the opening in the member,

to control communication between the ex- In testimony whereof I afiix my signature haust and inlet passages, means extending in presence of two Witnesses. through the sleeve and engaging the mem- FRANK M. DAVIDSON. ber, whereby to hold the latter from move- Witnesses:

5 ment during the operation of the valve, and JOHN M. GRAY,

means for operating the valve. ALEX; BARRON.

Copies 01 this patent may be obtained for five cents each, by addressing the Commissioner 0! Patents,

Washington, D. C.

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