US4388A - Mode of operating safety-valves - Google Patents

Description

E STATES PATENT OFFICE.

JOHN sHORB, or CANTON, OHIO.

MODE OF OPERATING SAFETY-VALVES.

Specification of Letters Patent No.

To all 10h-omit may concern Be it known that I, JOHN SHORE, of Canton, in the county of Stark and State oi Ohio, have invented a new and Improved Safety-Valve, and that the following is a full, clear, and exact description of the principle or character thereof, which distinguishes it from all other things before known, and of the manner of making, co-nstructing, and using the same, reference being had to the accompanying drawings, making part of this specification.

In all the different modifications of steam safety valves, there has been a difculty in preventing` them from adhering to the seat, or causing them to act with certainty at all times, which imperfections I in part remedy in the following manner: I attach to any boiler a safety valve either of common construction, or a piston moving in a cylinder. To the stem of this valve I attach a combination of levers which are made to hold down said valve by a catch or notch in one of said levers which is set off and relieves the safety valve by the rising'of a stem attached to a smaller valve under said lever, by raising it as the pressure is carried above the desired point, after which a weight is brought into action upon the valve to regulate the pressure.

In the accompanying drawings, Figure l is a side elevation of a boiler with the apparatus attached, (a) is the boiler of ordinary construction, (b) is a safety valve, the stem (c) of which has a double shackle that connects it with a short lever (e) of the second order above it. ne end of this lever is jointed to a frame (f) composed of two standards as shown in Fig. 3 aflixed to the boiler on one side of the valve seat, and rising perpendicularly above the top of the valve stem to a sufficientheight for the purpose intended; the point of connection of lever (e) with the frame is high enough to allow said lever, when the valve is down, to assume an angle of about 4.5", as represented in the drawings and its height. may be regulated by screw X. A long bar (g) is jointed to the lower end of lever (e), and extends horizontally through between the side pieces of the shackle that connects lever (e) with the valve stem; this bar (g) has a notch on the under side that catches on the end of thesaid stem on the lower connect-ion of the shackle which holds it in the position shown in the Fig. l, and

4,388, dated February 2o, 184e.

the valve is thus `prevented from rising; near the end of this bar which is free there is a small valve (7i) situateddirectly under it, the stem of which has a cross head (L) on it, as represented more clearly in Fig. 2, and to this, weights may be attached to hold the valve down under proper pres# sures, but when this is exceeded, the valve rises and lifts the bar sufficiently to detach it from the shackle, which allows the lever (e) and valve (Z9) to rise unobstructed by anything but its own weight, Over the lever (e) is another longer lever (i) that is also jointed to the frame (f) on this lever a weight is suspended and from a point nearly above the valve stem an arm projects down to lever (e) into a slot in whichv its lower end passes; there is a shoulder above at some distance so as to allow lever (e) to rise somewhat before it strikes it, for a purpose hereinafter mentioned; the lever (i) and its weight are held in their posit-ion by the following arrangement: The lever projects beyond its fulcrum on the other side at (7c) and has a pin standing out from its side, a bent lever (l) which has the same fulcrum extends out over this pin and downward toward the boiler, nearly to a level with the bar (g), which end is provided with a horizontal bar (m), (similar to the arrangement of (e) and (g) above named) that extends back through a mortise (n), in the frame (f), (which mortise is shown in the detached view of the frame in Fig. 3,) and extends out beside the shackle (d) by means of a notch in said bar (m) that catches on the lower side Aof the mortise in which it works, the lever (i) and its weight are held up.

The operation of this apparatus is as follows: As the pressure of steam improperly4 increases, the valve (it) rises and relieves bar (g) which frees valve (b) and allows steam to escape; but on rising, a pin (s) standing out from the side of the shackle (d) strikes bar (m) and relieves ity so as to allow the weighted lever (i) to descend and bear on the valve (o) by means of its connection therewith as herein before described. This weight is graduated for the proper pressure on the boiler, and when sufficient steam is discharged to bring the pressure to that point, the valve is made to descend and the bar (g) catches and holds it after which the weight can be again raisedy by drawing back the bar until it catches claim as my invention and" desire t'o secure by Letters Patent is- The metliod of freeing. the valve (b) by By this imeansl of the-bam" (g) and valve (la), suby'stantially as' herein described, in combination With Jthe Weighted lever (i) and the apparatus forbringng the same into action,

constructed" and` operating in the manner JOHN SHORB.

p set forth.

Witnesses ADAM THIMNELL, ELI SOWERS.

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