US1566484A

US1566484A - Incandescent xamp

Info

Publication number: US1566484A
Authority: US
Publication date: 1925-12-22
Anticipated expiration: 1942-12-22

Description

.- Dec. '22, 1925- F. J. LAUTE-RQACHA INCANDESCENT' AMP. j Fil ed A ril 121, 1919:.

INVENTOR 'fhdenck (Mad/Mm BY shock of a blow given in any plane.

Patented 51)... 22, 19,25.

UNITED" STATES,

OFFIC FREDERICK J'OHN'LAUTERIBACH, or BROOKLYN, NEw 'Yonx, Assrenon TO wns'rrne- HOUSE LAMP compan A CORPQRATION or rnnnsyrvama.

mcannnscnnrh nAMr.

' To all whom it may concern: I

, Be it known that I, FREDERICK J OHN LAUTERBAOH, a citizen of the United States, and a resident of Brooklyn, in the county of 5 Kings and State of New York, have invented a new and useful Improvement in Incandescent Lamps, of which the following is a specification. This invention relates to the construction of a rugged type incandescent lamp and particularly to an improved means for re? siliently supporting the filament.

tungsten lamp is applied, which subject the lamp to excessive vibration, such as when usedon street cars and battleships, in factory buildings, etc. This vibration produces strains in the mount carrying the fila? ment which strains quite frequently cause an entanglement of adjacent strands of the file-- ment, thereby changing the efiiciency of the lamp or effecting its failure, and in the case of severe shocks the glass arbor, supporting the filament, is fractured. It is obvious that these strains are in every direction and, un-

less some shock absorbing means is provlded,

an early failure of the lamp may be predicted fromthe above and other reasons; p

It is an object of the invention to provide a mountin for the filament capable of with standing 1; e stresses produced in any direction. In carrying thisobject into effect I resiliently support the usual glass arbor, said support being designed to absorbcthe junctively with t is resilient support I .use

,a special form of winding which has a tendency to positively maintain the adjacent strands of filament separate from each other.

In some ty es of rugged lamps, it is desirable to limit the vibration of the filament mount in the direction of the leading-in wires for the reason that the leadin -in .the lament mount, do not vibrate with equal freedom, and this very often results in the breaking ofi' of the leading-in wires from The special object of the invention is to provide a shock absorbing means which will retard the vibration of the filament mount in a plane parallel to the plane drawn form of my invention; Fi 2 is an eleyation There are many uses to which the present or button formed near'each end 'of'the arbor; 5

wires l being comparativelymore rigid t an 'pendicular to theaxial lineofthe loops and Application filed April 21, 1919. Serial'No. 291,738.

through the longitudinal axis of the leadingin wins Other objects of the invention will mani fest themselves upon a reading'of the following description. I

Throughout the several views of the accompanying drawings similar reference characters refer to like parts.

In the drawings, Fig. 1 illustrates an elevation of a lamp mount embodying one the leading-in wires 2 are sealed, the inner ends thereof being connected with terminal strands of thejfiljfniiti3. Ihe filament 3 is supported upon'aaihdnnt 4 comprised ofa glass arbor 5j-havin fla series of radially disposed hooksin'sertedintoan enlargement The arbor 5- is-joined to the ress -1 by means of a connectin member or link' 6, having its T ends imbedde intothe stem, land arbor 5.

The link6 may be of any formation, whichjfi? will be more shockabsorbing than a straight--- member of like material and not provided with weakened portions designed to ave unequal shock resisting properties either axial-,

1y -or radially. .I have illustrated several forms which the link 6 may be given, the preferred one being shown in Figs. 1 and 2." This styleof linkmay consist of one or more closed loops formed intermediate the ends of a length of resilient material such as pianowire. Theends of-the link fiext'end in opposite directionsand areinserted into the adjacent, glass elements so as tobe' in the axial line of both the bulb and the fila-. ment mount. J f r ,z'

From an inspection ofthe drawings, it will be apparent that when the link 6 is provided with one or moreclosed'loops the greatest; lateral resiliency-will be in a direction perthe arbor, thusa vibration of the arbor will IOQ jar will tend to vibrate the arbor in a predetermined direction, namely, in the path of least resistance. will, therefore, be an oscillatory one about the axis of the loops.

Owing to the relatively large radius of the loops with respect to the diameter of the wire of which it is composed, the'link may be constantly distorted without over-reaching the elastic limit of the metal, thus long service is possible since the metal is not fatigued and weakened to any appreciable degree. The leading-in wires as illustrated, are bent to angular form. One leg of each of the leading-in wires may be positioned in a common plane, substantiallyv perpendicular to the axial line of the link. The other legs of the leading-in wires may be positioned in a plane substantially parallel to the axial line of the link. The free ends of the leading-in wires connect with the terminals of mony, the distance between the ends of the leading-in wires and the supports upon which the leading-in wires are disposed will vary anda stress will be imparted to the filament. The angular construction of the leading-in wire provides a compound pivot and it may move about the .pointadjacent the stem and about the apexof its angle.

The looped link in combination, therefore, with the angular leading-in wires, provides a construction which greatly relieves stresses on and reduces the possibility of rupture-of the filament.

The form of link illustrated by Fig. 3 hasasubstantially closed loop intermediate its ends and may be flattened on opposite sides so as to be of less thickness in one direction than in another, 'as clearly illustrated by an enlarged end view. In this figure the loop is formed with the flattened surface on the inside, thus adding to the resiliency of the link when absorbing a shock received in a plane substantially parallel to that of the loop, and being more rigid when vibrated in a plane other than parallel to that of the said loop. Accordingly, when the form of link illustrated by Fig. 3 is employed, if mounted in such a manner that its loop is in a plane parallel to the planes in which each of the leading-in wires 2 are disposed, it'has the same tendency to retard the vibration of the arbor in a directiozrperpendicular to the planes of said leading-in wires, as is characteristic of the link shown in Figs. 1 and 2.

The movement of the arbor The modification of the link shown in Fig. 4 contemplates the formation of three open loops positioned substantially 120 apart, and arranged one above another while Fig. 5 illustrates a somewhat similar formation consisting of two loops separated 180,

If desired, the link 6 may comprise a.

item in that it must have special resiliency and strength to withstand the'shocks absorbed by it for a period equal to the present life of a commercial lamp. If the wire from which the link is made is too springy or elastic, it will have a short'life, whereas, on the other hand, if it is too rigid, it will fail to function properly. The cross-sectional area is another important factor to be taken'into consideration in selecting a material or wire from which the link 6 is to be made, as the link must be inserted in the glass when in a plastic condition and the amount of heat absorbed by the metal comprising the link is liable to change the temper thereof and destroy.-its;-'resilient-property. I have foundthatipiano wire" of from 24 to lid-mils." in diameter is the most suitable'for lamp of the smaller wattages, i. e., 25 to 50 Watts. It is obvious that the general design of the link as to lengthfdiameter, and number of loops will vary with the size of lam I in the link is used.

In Fig. :I' have, illustrated a form of winding which has proved very effective for maintaining the adjacent strands of the filament separate, especially when used in com- .blnation witha shock absorbing link such as contemplated by my invention. In this form of winding, the filament is first attached to one of the leading-in wires, and it is then led to one of the upper hooks immediately thereabove, taken over to the adjacent hook ofthe same series, and brought downward to the hook of the lower series that is in alignment with the last mentioned upper hook. The filament is then wound over the adjacent hook of the lower series and brought back to a top hook, the method of winding being the same for the remaining hooks as just described. The filament after being strung upon the hooks has its free end secured to the other leading-in wire,'which completes the winding operation.

' While this invention has been set forth in certain preferred embodiments, it will be Leeaeae resilient support member joining said stem and arbor, said link being shaped to looped form between said stem and arbor, the loop.

being positioned with its axial 'line substantially at right angles to the. axis of the arbor.

. 2. An incandescent lamp'comprising an' arbor having a filament supported thereon,

a resilient supporting member connecting said stem and said arbor, a loop intermediate the ends of said member, said ends being disposed upon the longitudinal axial line of said arbor and the axis of said helix being substantially at right angles to said axial line.

3. An incandescent lamp comprising a stem, an arbor, a resilient supporting member disposed substantially on the longitudinal axis of said lamp connecting said arbor to said stem, a filament supported on said arbor, relatively-rigid leading-in wires embedded in said stem and having the ends thereof connected to the terminals of said filament and a helix in said'resilie nt member having the I axis thereof substantially at right angles to the portions of said leadingin wires connected to said filament.

4. An incandescent lamp comprising a stem, an arbor, a resilient member comprising a helix terminating in straight portions,- said-portions being connected with said stem and arbor and positioned coincident with the longitudinal axisof the lamp, a filament supported on said arbor, "leading-in wires embedded in said stem and having their ,free ends secured to the terminals of said filament, said leading-in wires being bent to, position' a portion of'their length adjacent to their exposed ends in parallel relation to the axial line" of said arbor said loop. in said re silient member having the axial line thereof substantiallyat'right angles to the longitudinal axis of said portions of said leading-in wires. '5. An "ncande scent lamp comprising a stem, an arbor having a filament supported thereon, leading-in wires embed ded in said stem and. connected to the terminals of said filament, sa id leadingin Wires having a portion of their length 65 parallel to and portion of their length at right angles to the-axial line of said arbor, a resilient supporting member having an end thereof",embedded in :said stem and an end embedded in said arbor, ahelix in said member disposed intermediate saidends and having the axis thereof sub-- stantially at right angles to the axial lid of the arbor. '7 i 4 In testimony whereof, I have hereunt subscribed my name this 10th day of Apri 1919.

FREDERICK JOHN LAUTERBACH.