US1188802A - Smoke-indicator. - Google Patents

Description

T. W. McNEILL & I. J. BABCOCKI SMOKE INDICATOR.

APPLICATION FILED MAR. 20, I916.

Patgn'ted June 27, 1916.

THOMAS W. MCNEILL AND IRA J. BABCOCK, OF CHICAGO, ILLINOIS.

SMOKE-INDICATOR.

Specification of Letters Patent.

Patented June 2'2, 191%.

Application filed March 20, 1916. Serial No. 85,262.

, To all whom it may concern Be it known that We, THOMAS W. Mo- NEILL and IRA J. BABCOCK, citizens of the United States, all residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Smoke-Indicators, of which the following is a specification.

This invention relates to improvements in smoke indicators, such as are used with fuel consuming devices to indicate the density or amount of smoke passing to the flue or chimney.

The invention relates more particularly to an improvement or modification of the smoke indicators, shown in our prior Patents No. 1,012,403 issued December 19th, 1911 and No. 1,103,603- issued July 14th, 1914.

One of the particular objects of this invention is to provide a comparatively inexpensive apparatus such as may be quickly and easily installed on a boiler setting without altering the flue structure.

Another object of the invention is to provide a smoke indicator which is readily visible from any point in the boiler room in front of the boiler and which may be easily and readily removed should occasion demand.

Still other objects will become readily apparent to those skilled in the art from a consideration of the following description and drawings, wherein Figure 1 is a vertical longitudinal sectional view through a boiler setting showing our improved smoke indicator mounted thereon. Fig. 2 is an enlarged vertical longitudinal sectional view through the sight casing. Fig. 3 is a transverse vertical sectional view on the line 33 of Fig. 2, and; Fig. 4 is a vertical sectional view through the casing containing the source of light.

In the construction shown in our prior patents the smoke indicator is inserted in a flue passing from the boiler to the stack. Such an arrangement is sometimes objected to because of the fact that in some installations it is more or less diflicult to so locate the sight, or aperture through which the smoke is visible, at a point whereit is easily viewed by the firemen. In our present invention the source of light and the sight are s located as to utilize an opening through tl ieboiler, such for example as the fire tube,

as a chamber through which the rays of light are projected onto the sight screen and in view of this we are able to mount the sight on the front door of the smoke bOX where it is easily viewed by the fireman without effort. As the most commonly used type of boiler setting positions the fire tubes at a considerable elevation above the floor, we have found it desirable to curve the sight screen, for example, into a spherical shape, so that it may be readily visible from a distance and from any point in the room in front of the boiler without the necessity of provided a source of light, indicated in general by the numeral 15, and in the door. 16 carried on the front wall 11 of the setting we have provided a sight screen or indicator 17 in alinement with the axis of the same tube 14.

The lamp, or as it may be termed, the source of light, is illustrated in detail in Fig. 4, and comprises a tubular casing section 18 adapted to slide within an aperture 19 cut in the back wall 12 of the boiler setting in axial alinement with the fire tube 14. The rear end of the tube 18 is flanged out as at 21 and at one side is provided with a pintle 22 on which is hinged a reflector casing 23 at the focal center of which is mounted a source of light, in this instance, an electric light, bulb 24. Carried by the reflector casing 23 is a transparent screen 25 interposed between the tube 18 and the source of light. A spring latch 26 positioned at the opposite side of the casing from the pintle 22 serves to lock the reflector casing 23 in position, as shown in Fig. 4. The tube 18 is formed with a bead 20 between which and the shoulder 21 is provided a series of perforations 27 to permit an inflow of air which reduces the amount of smoke and (lust accumulated upon the reflector 23; A ring 28 perforated to correspond to the perforations 27 is slidable tapers upwardly away fromthe door to receive the wedge shaped base 32 which 1s seamed on the rear end of the sight tube 33. The outer end of the tube 33 is provided with apertures 34 and a slide ring 35 similar to those provided on the tube 18.

A parti-spherical sight screen of translucent material 35 is mounted in an annular ring 36 which serves as a door for the outer end of the tube 33, being hingedly connected thereto, as at-37. A spring latch 38 locks the door in place as shown in Fig. 2. With the flange and beaded tube mounting the sight tube as an entirety may be quickly and easily removed when occasion demands, as for example, to prevent damage to the sight tube when the door 16 is swung open for inspection of the boiler.

Light emanating from the bulb 24 is reflected through the tube 14 and thrown upon the screen 35, the intensity or brillianc-y of the light depending, of course, on the quantity or density of smoke passing through the tube. As the screen 35 is curved it may readily be observed from any point in the boiler room greatly facilitating the work of properly firing the boiler.

Whereas we have illustrated and de scribed a single embodiment of our invention, it is obvious that various changes may be made therein without departing from the spirit and. scope of the following claims.

Having described our invention, what we claim is z.-

1. The combination with a smoke indicator, of a sight opening, having a curved translucent screen.

2. The combination in a smoke indicator, of a source of light, a sight tube and a spherical, translucent screen positioned in the outer end of the tube.

3. The combination with a boiler setting and a boiler having a gas conducting passage extending therethrough, of a source of light positioned opposite one end of said passage, a sight tube positioned opposite the other end of the passage and extending to a point outside the boiler, and a translucent screen carried by the outer end of said sight tube.

4. The combination with a boiler setting and a boiler having a gas conducting passage extending therethrough, of a source of light positioned opposite one end of said passage, a sight tube positioned opposite the other end of the passage and extending to a point outside the boiler, and a curved translucent screen carried by the outer end of said sight tube.

5. The combination with a boiler setting and a boiler having a gas conducting passage extending therethrough, of a light reflecting surface positioned. at the rear of and in alinement with said passage, a sight tube positioned in alinement with and at the front end of the passage, and a curved translucent screen carried by said sight tube.

In testimony whereof we hereunto set our hands.

THOMAS MGNEILL. IRA J. BABCOCK. In the presence of FoRfiE BAIN,

MARY F. ALLEN.

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