US137097A - Improvement in low-water alarms and indicators - Google Patents

Description

i. ROSS.

Lo'w water Alarms and Indicators.

,NO. 137,097. f PatentedMarch 25,1873.

UNITED STATES Parana @rrroa.

JOHN ROSS, OF GREENVILLE, MICHIGAN.

iMPRGVEMENT m Low-warm ALARMS AND lame/woes.

Specification forming part of Letters Patent No. 139,097, dated March25, 1873.

To all whom it may concern:

Be it known that I, JOHN Ross, of Greenville, in the county of Montcalm and State of Michigan, have invented a new and useful Improvement in Low-Water Alarm and Indicator and I do declare that the following is a true and accurate description thereof, reference being had to the accompanying drawing and to the letters of reference marked thereon and being a part of this specification, in which- Figure l is a perspective view of a two-flue boiler fitted with my improved alarm, a portion of the shell being broken away to show the float. float and dial-shaft and their attachments, and Fig. 3 is a cross-section of the dial-shaft and cam at at a; in Fig. 1.

Like letters refer to like parts in each figure.

The nature of this invention relates to an improvement in that class of low-water indicators and alarms which are operated by a float contained in the boiler to which they are attached, and has for its object to combine with such indicators a whistle to be operated at any desired point in the rotation of the indicator-shaft. The invention consists in the general construction of the indicator; in the peculiar form of the hollow metallic float, which is less liable to quick or irregular vibration in the foaming or priming of the boiler, and thus insures a correct indication of the general levelof the water; and in connection with an indicator having a rotary index-shaft, a whistle alarm operated by a cam on said shaft, in the manner more fully hereinafter set forth.

In the drawing, A represents a flue-boiler, to which is attached a whistle, B, whose valvelever O has suspended to it a rod, D, in front of the boiler, and weighted at the lower end,

' above which a catch, a, is attached to and projects from the side of the rod. E is a shaft, journaled through a stuffing-box, b, in the front head, and a bracket within the boiler, its rear end being bent to a right angle to form a lever, to the'end of which is suspended, by a rod, F, the float G, which is a watertight hollow cylinder with long conical ends. The outer end of the shaft projects into a dial-case, H, and carries at its extremity an in- Fig. 2 is a perspective view of the.

dex, c, the case being supported at a little distance from the boiler by two rods, cl 01. Back of the dial a cam, e, is adjustably secured to the shaft E by a set-screw, e. The catch of the rod D is placed upon the dial supporting rod 01, which sustains the weight of the rod D and whistle-lever.

WVhen the water is at the proper height above the flues the cam e is adjusted on the shaft behind the catch a, so that it will not come into contact with the latter so long as the water in the boiler is at or above the proper level, and secured there by its set-screw. If the water falls below the proper level, the shaft, being rotated by the float, will cause the cam to push the catch off its supportingrod, when the weight suspended from the whistle-lever will open the whistle-valve and. sound an alarm.

When it is not desired to use the alarm the catch a may be hooked onto the rod d behind the cam of the dial-shaft.

The peculiar form of float shown has several advantages, first among them being the greater steadiness of the float, owing to its length in proportion to its breadth and dis placement, at such times as foaming of the boiler is occurring, which, in case spherical floats are employed, is liable to deceive the engineer as to the actual height of water in the boiler; the conical ends insure greater strength to the float, as they cannot be injured at pressures which would collapse and destroy a square-ended float, which also enables me to use lighter metal in this form, and thus increase the buoyancy of' the float.

What I claim as my invention, and desire to secure by Letters Patent, is-- 1. The cranked shaft E journaled through the stuffing-box?) and bracket, the rod 15, float G, the dial-case H supported by the rods d d, and the index 0 at the end of the shaft E, all arranged to operate as a water-indicator, sub stantially in the manner described.

2. The weighted rod D provided with the catch a suspended from the lever of an alar1nwhistle, and the adjustable cam e on the shaft of the water-indicator, arranged to operate in the manner and for the purpose set forth.

Witnesses: JOHN ROSS.

H. F. EBERTS, H. S. SPRAGUIE.

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