US736681A - Gas-lamp. - Google Patents

Description

PATENTED AUG; 18, 1903.

T. BRABSON.

GAS LAMP. APPLICATION P111111) 0M. 10, 1902.

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No. 736,681. PATENTED AUG. 18, 1903-.

T. BRABSON.

' GAS LAMP. APPLICATION FILED our. 10, 1902. no MODEL. 2 SHEETS-SHEET 2.

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NlTE STATES ATENT OFFICE.

TOM BRABSON, or BROOKLYN, NEW YORK, AssIeuOR TO FULTON BRASS &; MANUFACTURING COMPANY, OF BROOKLYN, NEW YORK, A OORPORA TIONOF NEW YORK.

GAS-LAMP.

SPECIFICATION forming part of Letters Patent N 0. 736,681, dated August 18 1963'. Application filed October 10, 1902. Serial No. 126,655. (No model.)

T (ZZZ whom it II 00771067771! little useful effect and to furtherincrease the Be it known that I, TOM BRABSON, a citizen ugliness of the whole. of the United States, residing in the borough According to my invention I provide above of Brooklyn, county of Kings, city and State the usual globe a simple cylindrical screen, 5 5 of New York, have invented certain new and preferably of a diameter at least as great as usefullmprovementsin Gas-Lamps, of which that of the opening in the top of the globe the following is a specification. and of a height sufficient to form a suitable My invention aims to provide certain imdraft, the column of air moving directly up= provements in incandescent gas-lamps, and ward without substantial obstruction in the 1o especiallyin cluster-lamps-such as are comcylindrical screen. This screen also furmonly used for lighting stores, large halls, or nishes quite sufficient protectionagainstcrossthe like-whereby the construction of a com drafts, at least for indoor use or for use in plete lamp is made very simple and cheap, any comparatively sheltered place. The whereby a better draft and a whiter light screen is preferably perforated to admit the I5 are secured than in such lamps as now comoutside air directly to the column of hot air monly constructed, whereby ample protecto gradually cool the rising column and to tion is afforded against insects and against supply oxygen for the consumption of the cross-drafts withoutsubstantiallyobstructing carbon of the gas, which consumption conthe passage of the hot gases of combustion, tinues for some distance above the lamp. 7o 20 and whereby especially the entire lamp is This reduces the amount of smoke issuing given a most graceful and pleasing appearfrom the lamp. By reason of the perforaance without sacrificing its lighting qualities. tions in the screen I am also enabled to place My invention also provides certain imthe shade or bell which comes above the same provements in the controlling-valve of such a quite low down toward the upper edge of the 25 lamp, whereby a single tap is used for cutting screen. The shade referred to is placed 2. off any desired number of individual burners. short distance above the screen,sufficient only My invention also provides certain imto permit free egress of the rising column of provements in individual incandescent burnair within the screen, and serves not only to ers and in other details, as hereinafter speciprevent discoloration of the ceiling by the 3o fled. rising column of slightly smoky air, but also Referring to the accompanying drawings, acts to reflect downward substantially all the illustrating a lamp embodying my invention, light thrown upward by the burner-a feature Figure 1 is a side elevation of the complete which is generally lacking in lamps at preslamp. Fig. 2 is a longitudinal section of the out in use. The globe may be of any suitable 35 same, showing the burner and supply-pipe in 1 light-transmitting material, such as glass or elevation. Fig. 3 is alongitudinal section of porcelain. The screen is preferably of sheet the burner and controlling-valve. Fig. 4. is a metal. The shade is of suitable light-reflectside elevation of the complete burner, showing material of which ordinary lamp-shades ing certain parts in section. are made. 0 40 In cluster gas-lamps as commonly con- An important featurein myimprovcd lamp structed the most ugly and complicated conis a serial cut-out valve--that is to say, a

structions are in use for disposing of the hot valve which cuts off gas in succession from air discharged from the lamp without exposthe several branches leading from the main ing the lamp to the danger of being choked supply-pipe as the valve is moved coutinn- 45 by insects flying thereinto and of being ously in one direction. The burner is prefcaused to fluctuate by reason of drafts of air erably formed also with a dirt-receptacle beblowing across the top of the globe, which low the valve for preventing the same or any devices usually interfere'with the provision other parts of the burner from becoming of a suitable shade for reflecting the light clogged with the dirt which is collected from 50 downward, so that the latter is omitted enthe passing current of gas.

tirely or is arranged in a manner to have but Another novel feature of the invention is and adapted to inclose the lower edge of themantle.

Referring now to the embodiment illustrated in the accompanying drawings, A is a main supply-pipe leading down to and sup- 'porting a cluster B, consisting of four individual burners. The burners are located substantially in the center of aglobe O, of glass,

material, such as glazed ware.

and shade are preferably supported from the porcelain, or the like, which is of such size as to provide ample space for the passage of the necessary quantity of air therethrough. Surrounding the upper opening D of the globe is a cylindrical screen E, of metal, perforated in any suitable ornamental pattern, as shown, and extending upward a distance depending upon the size of the burner and the pressure of gas used. Atasuitable distance above the screen E to permit the easy discharge of the hot air arising through the screen is a shade F, preferably of any suitable light-reflecting The screen main supply-pipe A, the former by resting directly on the globe O and the latter by means of a collar G, secured directly on the pipe. In order to steady the screen E and to support the same when the globe is withdrawn, there is preferably another collar H on the pipe, which may be, as shown, a union connecting two separate sections of the pipe and which is situated a short distance below the normal position of a hub J, sliding on the pipe, and having two or more arms connected at their outer ends to the screen E. In order to simplify the manufacture of the screen and to make a more ornamental screen Without excessive cost, it is preferably formed in three parts-a central body E of truly cylindrical shape, as described, and upper and lower flaring portions E joined to the ends of the body portion E and formed in any desired ornamental design. The globe may be supported in any desired manner, being shown as supported at its bottom edge by arms K, projecting outward from the burner, and between which' there is space for the admission of ample air. The lower portion of the burner preferably extends below the globe and is surrounded by an ornamental cap L of any suitable design. I

M is a cock controlling the supply of gas to the burner and preferably extends downward through the center of the cap, completing the symmetrical proportions of the whole lamp.

The shade F is preferably adjustable, the collar G being secured at any desired point on the supply-pipe by means of a set-screw, as shown. By reason of this construction the outlet for the hot gases between the screen and the shade may be made larger or smaller, as desired, or the position of the shade to distribute the light reflected from it may be varied.

In lamps for indoor use it is desirable to make as short a lamp as possible, because the head-room available is sometimes very little. My improved lamp by reason of the perforated screen employed may extend only a short distance above the top of the burner, and the shade F not only prevents discoloration ofthe ceiling by the hot air rising, but acts to reflect the light thrown directly upward and which is lost in cluster-lamps of ordinary construction. A perfect draft is obtained, so as to avoid smoke and to secure a white light. The main supply-pipe, being inclosed and subjected to the heat from the burner, supplies partiallyheated gas to the burner,which improves the light. The perforated screen is ample protection against cross-drafts and against insects flying into the lamp in the majority of situations. The screen may fit down closely upon the globe, so as to prevent ingress of any substantial quantity of air at this point, which air would cause the light to fluctuate. The assembled lamp is made of most graceful and pleasing shape without any sacrifice of utility.

I also provide an improvement which makes .it possible to reduce the number of individual burners in use, so that, for example, at night a very low light can be maintained, and I do this without the addition of any mechanism other than that usually found in lamps in which all the burners must be in use. For this purpose the main supply-pipe is provided with a plurality of branches to the individual burners, and a single valve is arranged to cut off gas from said branches'in succession as it is moved continuously in one direction. As indicated in Figs. 3 and 4., the supply-pipe A carries at its lower end a member N, in which is formed a diaphragm 0, serving as a main valve-seat and which has a series of apertures at different sides and at different elevations, to which are connected the several branches P P,- &c., each of which branches supplies gas to one of the individual burners. Sliding within themember N is a valve comprising a plunger Q, having a long stem R, provided with a rapid screw-thread S at an intermediate portion and with a handwheel or the like at its lower end, as indicated. The passage in the member N is open at its lower end and leads into a dirt-receptacle T, attached to the lower end of 'the member N, in which the dirt which comes down the main pipe in the gas is collected,

the lower portion of the bore of the valve member N being made larger than the plunger Q to permit the collection of this dirt when the valve is entirely open, as in ordinary use. The lower portion of the dirt-receptacle E is formed into a long stem interiorly screw-threaded to correspond with the threads S, and preferably a stuffing-box U is provided upon the lower end of such stem. The valve is easily accessible, it being only necessary to remove the dirt-receptacle T, which carries with it the valve and valvestem. The dirt within the receptacle may then be removed and the parts quickly restored to their operative position. When the dirt-receptacle and the connected parts are removed, the various passages adjacent to the valve may be easily inspected.

The improvement in individual burners is best illustrated in Fig. 4, where it is shown applied to the tubes of myimproved clusterbnrner. It may, however, obviously be applied to incandescent gasburners of any other suitable type. In the embodiment shown the Bunsen tubes V are supplied with gas from the several branches P P, (be. from the main supply-pipe A, and the mantles W are supported from any suitable holdersuch, for example, as the overhead holder X. The lower edge of the mantle surrounds the upper end of the tube, as usual. It is found in actual experience that the space which is necessarily left between the lower edge of the mantle and the outer periphery of the tube in order to permit the placing of the mantle over the end of the tube admits a considerable quantity of air, which dulls the light and sometimes causes a vibration or fluttering of the mantle. My invention provides means for closing said space, so as to prevent the admission of air at this point within the mantle. The means which I employ for this purpose form, preferably, part ofa cap Y, placed over the upper end of the tube and preferably acting to hold the usual wire-netting Z in place on the tube, this cap, as shown, preferably inclosing the lower edge of the mantle by means of an upwardly-bent outer edge a, which is preferably made flaring to receive mantles of varying diameters and which preferably extends substantially to the level of the top of the tube, so that the mantle may shrink (as it usually does) without freeing itself from the cap. The cap should preferably stop at the level stated in order to avoid obscuring the light from the mantle. By the use of myimproved cap the light is not interfered with, but is in many cases improved in brightness and steadiness, and also the necessity of fitting the mantle accurately to the head of the tube is avoided.

Though I have described with great particularity of detail a lamp embodying myinvention, it will be understood that the invention is not limited to the particular embodiment illustrated and described. Various modifications of the same are possible to those skilled in the art without departure from the invention.

What I claim is- 1. In a gas-lamp the combination ofa globe, a cylindrical screen above and supported directly upon said globe, a burner within said globe, and a supply-pipe extending through said screen and supporting said burner, globe and screen, said screen having a diameter and a clear passage equal at least to that of the opening in the top of said globe, and being perforated to admit air from outside directly to the column of hot air ascending from said burner within said screen.

2. In a gas-lamp the combination of a globe, a cylindrical screen above and supported directly upon said globe, a burner within said globe, a supply-pipe extending through said screen and supporting said burner, globe and screen, said screen having a diameter and a clear passage equal at least to that of the opening in the top of said globe, and being perforated to admit air from outside directly to the column of hot air ascending from said burner within said screen, and a shade above said screen having its lower edge above the upper edge of said screen to permit free egress of the rising column of air therein.

3; In a gas-lamp the combination of a globe of light-transmitting material, an open cylindrical screen of metal above said globe, a burner within said globe, and a shade of lightreflecting material above said screen arranged to reflect downward and outside of said screen the light passing therethrough.

4. In a gas-lamp the combination of aglobe, a cylindrical screen above said globe, a burner within said globe, and a supply-pipe extending through said screen and supporting said burner and globe, said screen being supported directly upon said globe.

5. In a burner for cluster gas-lamps, the combination of a main supply-pipe, a plurality of branches connected therefrom at longitudinally-separated points, and a valve comprising a plunger in said pipe and adapted to cut off gas from said branches in succession as it is moved continuouslyin one direction.

6. In a burner for cluster gas-lamps, the combination of a main supply-pipe, a plurality of branches connected therefrom at longitudinally-separated points, a valve comprising a plunger in said pipe and adapted to cut off gas from said branches in succession as it is moved continuouslyin one direction, and a valve-seat in said pipe against which said valve closes after cutting off all said branches.

'7. In a burner for cluster gas-lamps, the combination of a main supply-pipe, a member connected thereto and carrying a valveseat, a dirt-receptacle below said member and a valve arranged to reciprocate in said memher, said member having a bore opening at its lower end into said dirt-receptacle.

In Witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

TOM BRABSON. \Vitnesses:

THOMAS F. WALLACE, FRED WHITE.

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