US652795A - Safety cut-off for water-gages. - Google Patents

Description

N0. 652,795. Patented luly 3, |900.

P. J. MAGDONALD.

S`AFET Y CUT-OFF FOR WATER GAGES.

(Application filed Oct. 2B, 1899.)

(N0 Model.)

man

. I @mib/Leona i' Mac'onald,

UNITED STATES Trice.

PATENT SAFETY CUT-OFF FOR WATER-GAGES.

SPECIFICATION forming part of Letters Patent N o. 652,795, dated July 3, 1900. Application filed October 28,1899, Serial No. 735,081. (No model.)

To @ZZ w/"tom it may concern: y Be it known that I, PARISH JOHN MACDON ALD, a subject of the Queen of Great Britain,

residing at Zacatecas, in the Republie'of Mexhave not been fully satisfactory; and the object of my invention is to provide a cheap,

strong, and reliable automatic cut-o.

My invention consists of certain details of f construction and combination of parts,which will be hereinafter fully described, set forth in the claims, and illustrated in the drawings, forming a part hereof, and in which- Figure 1 is a view in side elevation of a water-gage constructed in accordance with my invention, the gravity-levers being shown as raised, the central portion of the mechanism being broken out to shorten the gure, and the water and steam column being partly illustrated. Fig. 2 is a sectional view on the vertical plane indicated by the broken line 2 2 of Fig. 1 looking to the right, as indicated by the arrow, the gravity-levers, glass, and upper packing-head thereof being shown in elevation. Fig. 3 is a view in elevation, on an enlarged scale, of the lower end of the gage, showin g the water-cock with the gravity-lever held up in the position it occupies while steaming up the boiler. Y l Y Like parts are designated bythe samenu'- inerals wherever they appear in the several figures of the drawings.

Referring to the drawings by numerals, 5 indicates the water-column of a steam-boiler of ordinary construction, from which extend the steam-pipe 6 and water-pipe 7 to the castings 8 and 9, in which the gage-glass 10 is secured. Upon the casting 8 is formed or secured a cylinder 11 at right angles to the glass and to the pipes 6 and 7, and a pipe or tube 12, opening at its lower end in the glass, leads through the upper end of the casting 9 into the inner end of cylinder 11. In the cylinder .1S and 19.

is a piston 13, having its piston-rod 14 extending through the outer end of the cylinder,

4thepistonhead and rod bein g properly packed,

if deerned necessary, and a spring 15 being coiled around the piston-rod and normally j forcing the piston to the inner end of the cylinder.

16 andv17 indicate butterfly-valves or any other suitable form of valves or cocks in the steam and water pipes 6 and 7, respectively, said valves being provided with stems or plugs I Each plug is provided with a suitable packing-nut, as at 20, and on the lower valve 17, under the packing-nut, is a washer 2l, into one side'of which is threaded a horizontal bar 22, having a piece 24 hinged to its Youter end with a knife-point, as at 25, and

provided with a spring 26.

' Parallel gravity- levers 27 and 28 are secured to the stems 18 and 19, connected together by a link 29, the upper lever being provided with a notch 30 in its lower edge to rest over `the end of the piston-rod 14 when forced outward.

In the end of the cylinder 11 is a blow-od cock 31, of any ordinary construction, and for its usual purpose of cleaning out sediment of various kinds to keep the cylinder clean and the piston in good Working condition.

When the levers 27 and 28 are raised, the valves 16 and 17 are open, and when lowered the valves are closed.

When getting up steam, it is necessary to have the valves open, so that during this operation the levers are raised and the piece 24 turned up into a vertical position, as in Fig. 3, holding up the levers. As soon as sufeient steam is generated to press the pistonhead 13 outward against the pressure of the spring 15 the piston-rod 14 will be projected IOO close the valves, thereby immediately cutting,r o the steam from the gage.

The weight of the levers will be suiicient to close the valves; but this may be reinforced by a spring, if desired.

Having thus fully described my invention, what I claim as new, and desire to obtain by Letters Patent of the United States, is-

1. The combination with the water-gage glass, of a steam-boiler provided with steam and water cocks, of a gravity-lever secured to the stem of one of the cocks in position, when raised, to hold the steam-cock open and when lowered, to close it, a stop to hold the lever raised and held in position by the steampressure in the gage-glass, and means whereby a continuously-operated force is applied to withdraw the stop when the pressure is lessened or dissipated, substantially as described.

2. rlhe combination with the watergage glass, of a steam-boiler provided with steam and water cocks, of a gravity-lever secured to the stem of one of the cocks in position, when raised, to hold the steam-cock open and when lowered, to close it, a stop to hold the lever raised and said stop being held in position by the steam-pressure in the gage-glass, and a spring acting upon the stop in the opposite direction to withdraw it and permit it to fall and close the cock when the steam-pressure is lessened or cutolI", substantially as described.

3. The combination with a water-gage glass, of a steam-boiler provided with the usual steam and water cocks, of gravity-levers secured to the stems of the cocks, a link connecting the levers, a stop held in the path of one of the levers by the pressure of steam in the gage-glass, and means whereby a continuous force is exerted upon the stop to withdraw it from under the lever when the pressure is cut off, substantially as described.

4. The combination with a water-gage glass of a steam-boiler provided with the usual steam and water cocks, of gravity-levers secured to the stems of the cocks, a link connecting the levers, a stop held in the path of one of the levers by the pressure of steam in the gage-glass, and a spring whereby a continuous force is exerted upon the stop to withdraw it from under the lever when the pressure is cut off, substantially as described.

5. The combination with the watergage glass of a steam-boiler, and the usual steam and water cocks, of a gravity-lever on the stem of one of the cocks arranged tohold the cock open when raised and closed when low- 1 ered, a cylinder, a piston-head therein forced in one direction by the pressure of the steam in the gage-glass into the path of the gravitylever to hold it raised and a spring arranged to force the piston in the opposite direction, out of the path of the lever when the steampressure is removed, to permit the levers to fall and close the cocks, substantially as described.

6. The combination with a water-gage glass of a steam-boiler provided with the usual steam and water cocks, a link connecting the levers, a stop held in the path of the lever by the pressure of steam in the gage-glass, a spring exerting a continuous force against the stop to remove it from the path ofthe levers when the pressure is removed, and a stop manually operable to hold the levers up while steaming up, substantially as described.

PARISH JOHN MACDONALD.

Witnesses:

IGNACIO FLORES, MANUEL ORTIZ GALLARDO.

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