US360741A

US360741A - tonkin

Info

Publication number: US360741A
Authority: US
Publication date: 1887-04-05
Anticipated expiration: 1904-04-05

Description

(No Model.) 2 Sheets-Sheet I.

J. J. TONKIN.

VALVE MEOH'ANISM.

No. 360,741.. Patented Apr. 5, 1887.

III

i (No Model.) 2 Sheets-Sheet 2.

J. J. TONKIN.

VALVE MECHANISM.

N0. 360,741. PatentedApr. 5, 1887.

WITNESSES INVENTOR I John IJZZUQ'R,

, By izisflttome s It PETERS Mo-Lilhonplwn Wuhingwn, D. Q

UNITED STATES PATENT OFFICE.

JOHN J. TONKIN, OF OSYVEGO, NEWV YORK, ASSIGNOR TO THOMSON KINGS- FORD, OF SAME PLACE.

VALVE M-ECHANISM.

SPECIFICATION forming part of Letters Patent No. 360,741, dated April 5, 1887.

Application filed December 27, 1886. Serial No. 222,624.

To aZZ whom it may concern.-

Be it known that I, JOHN J. ToNKIN, of 0swego, in the county of Oswego and State of New York, have invented certain new and useful Improvements in Valve Mechanisms, of which the following is a specification, reference being had to the accompanying drawings, in which- Figure 1 is a plan view; Fig. 2, a central section; Fig. 3, a section at right angles with Fig. 2; Fig. 4, another plan with different details indicated in dotted lines.

The object of my improvements is to provide for use, in connection with a main slidevalve of ordinary character, a removable automatic cut-otf-valve mechanism which may be operated by a governor to open the ports when the engine has a heavy load and to close them when it has a light load, thereby automatically regulating the cutoff to correspond with the varying work to be done by the engine. I provide such a cut-off valve so constructed and arranged that it may be removed at will from the steam-chest, leaving the ordinary slide-valve to work alone, whereby repairs can be made to the slide-valve without in the meantime discontinuing the use of the engine.

Referring to the letters upon the drawings, A indicates the steam-chest; B, the main slidevalve; 0, the main-slide-valve stem, the usual steam-ports, a a, and exhaust-port, I), being provided.

D indicates agovernor-stem, operated by any ordinary governor, E, and provided with collars F F for the purpose of operating levers G G, pivoted at H H. These levers engage, by a ball -and-socket joint, with the cut-off valves I I, which slide in ways K and on the upper surface of the main slide-valve.

L indicates a frame for supporting the levers and the automatic cutoff-valve stem.

This frame, of which the guideways form a part, as illustrated, can be screwed to the side wall of the steam-chest, as shown, so that by withdrawing the screws the frame and automatic cut-off valve and stem can be removed (No model.)

from the steam-chest at will, leaving the main slide-valve to operate alone.

The operation of the automatic cut-off valve is as follows: Oscillating motion is communicated to the pivoted levers by means of the vertical reciprocating movements of the governor-stem, and the levers in turn slide the cut-off valves over the steam-ports, or away from over them, according to the variations of the speed of the-engine which may be caused by the varying load of the engine. For example, suppose the main cut-off valve, which is always set to out off at some definite part of the stroke, be set so as to cut off the steam at a three-quarter stroke. When the engine has a heavy load, the automatic valves will open the port so as to let on afull head of steam for three-fourths of the stroke; but when 6 5 there is a lighter load, not requiring steam for so much of the stroke, the slide-valves will close, so as to out off the steam at less than a three-quarter stroke, according to the needs of the engine for the work to be done. the advantage of providing for taking out the automatic cut-off and its supporting -frame bodily, the construction and arrangement of the parts for operating the automatic cut-off valves is of great simplicity.

Having described my improvement, what I claim to be new, and desireto secure by Letters Patent of the United States, is

The combination, with the steam-chest and a main slide-valve, of the automatic cut-off valves, the pivoted levers G G, oscillated by the governor-stem D and governor E to operate the cut-off valves, and the removable cutoff-valve frame L, whereby the cutoff-valve mechanism can be removed bodily and the 8 work of the engine continued without it, substantially as set forth.

In testimony whereof I have hereunto subscribed my name. 1

JOHN J. TONKIN.

WVitnesses:

MARCUS S. HorKINs, G. P. ELwELL.

Besides 7o