Improvement in low-water registers for steam-boilers
US 130786 A
Description (OCR text may contain errors)
W. S. BELT.
Improvement in Low-Water Regste for Steam-Boilers.
Patented Aug. 27, 18712.
UNITED STATES PATENT OFFICE.
WILLIAM S. BELT, OF CINCINNATI, OHIO.
IMPROVEMENT IN LOW-WATER REGiSTERS FOR STEAM-BOlLERS.
Specification forming part of Letters Patent No. 130,786, dated August 27, 187:2.
I, WILLIAM S. BELT, of Cincinnati, Hamilton county, State oi Ohio, have invented eertain new and useful Improvements in Low- Water Indicators for Steam-Boilers, of which the following is a specification:
N atmc and Objects of Invent/ion.
My invention relates to the expansion-tube class ofindicators; and consists, iirst, in a certain construction of this apparatus for registering by which no more than one time can be recorded for each alarm, no matter what may be the extent of the expansion of the tube 5 second, in a certain construction of the expansion tube and connection with the whistle and boiler, by which the temperature of the tube is reduced to the lowest possible point when occupied by water 5 third, in a certain construction of the device for sustaining the valve of the whistle, by which the extreme contraction of the expansion tube, when the boiler is cold, is provided for.
Description of the Acconwauyt'ng Draw/ing.
Figure 1 is an elevation', partly in section, of an apparatus embodying my invention attached to a steam-boiler. Fig. 2 is a face view of the registering-dial.
the alarm-valve D of the whistle E. To the,
side rods C C a case or box, F, is secured, in which is journaled a revolving wheel, G, cut with ratchetteeth on its periphery. The outside of the case F is fitted with a dial of numbers, which is traversed by a finger, I-I, secured to the wheel G. At the outside of the expansion tube B, nea-r the top, a rod, I, is fastened, which communicates, through multiplying-levers .I K, with the pawl L, which opera-tes the wheel G. The levers J K are fulcrumed at a b, respectively, and are linked together by a strap, c. A spring-pawl, d e, prevents backward movement of the wheel G. The pawl L is kept against the wheel G by spring f, except when elevated excessively by a great degree of expansion of tube B. In the latter event it is forced off the wheel by studpin g, and the registering of more than one notch is prevented. At each elevation of the tube B, occasioned by low water in the boiler, the nger H moves, by the means described, and counts one upon the dial, and thus an inspector can determine the frequency of lowwater occurrences. The register must be so secured that it cannot be tampered with. To the top of the expansion tube a diaphragm steam-gage is fitted, the chamber M of which forms an air-vessel for the reception of air from the tube B. rlhis provision enables the water to rise in tube B when the steam is first raised, while at the same time the only appliance used to permit it is an ordinary pressuregage, which has a separate and distinct office to till-that ot' indicating steam-pressure. A metallic nipple, N, composed of a material having the least possible heatconducting power is interposed between the boiler and tube B, and the steam-chamber O 0ID the whistle is separated from the expansion tube by a coupling having a long narrow neck, I. By reason of this provision of coupling P and nipple N, of the character described, so little heat is communicated to the tube B, either from the boiler-plate A or steam-chamber O, that, when occupied by water, it is so contracted that a great degree of expansion is certain when it is occupied by steam; thus a wide opening of the valve is secured. The rods C C, near the top at 71., are bent or bowed in the form of semicircles, to permit of their giving way7 by springing when a great contraction of pipe B takes place on the boiler becoming cold; thus aheavy strain on the small valve-fastenin gs is prevented. The rods C C' are hollow, as shown, and a free circulation of air is secured by their being left open at the bottom and pierced at the side z' at the top. This prevents, in a great measure, the expansion of these rods when steam occupies the tube B and heats the indicator.
The steam-gage shown attached to the indicator, and one which I prefer in all eases, is ofthe recording77 description, having an extra finger for recording the maximum pressure reached.
Claims. 1. In combination with the tube B,whee1 G, rod I, and levers K L, the pawl L and stud-pin g, as described, and for the purpose stated.
2. In .the described combination With the steamcharnber O and tube B, the non-conducting nipple N and connecting-coupling having a .narrow neck, P, as and for the purpose specified. v
3. In combination with the tube B, the hol- 10W perforated rods C C t', formed with curved sides h, for the support of the whistle-valve, all substantially a-s and for the purposes specified.
In testimony of which invention I hereunto set my hand.
, W. S. BELT.
FRANK MILLWARD, J. L. WARTMANN.