US2322945A - Ventilated lamp housing - Google Patents

Description

June 29, 1943. A. LIABASTRE VENTILATED LAMP HOUSING Fild March 26, 1942 INVENTOR. HLBERTL lfiB/75TR5 duulu' {Lad/;

FITTORNEY Patented June 29, 1943 i a! r IPA-rm; mg

f VEN ILATED LAMPIHousING Y i Albert Liabastre, Great Neck, N. Y. Application March 26, 1942 Serial Naj'43a22 4 Claims. (Cl. 240-47) This invention relates to lamp housings for electrical fixtures and is intended primarily for use in connectionwith lighting fixturesfor sewing machines. Such fixtures are mounted directly on the sewing machine in such manner as to: permit light; to. be directed upon work passing beneath the ;foot of the sewingmachine In q orderto satisfactorily carry. out the function of lighting the work directly at the needle,a. fairly I ,bright electriclamp is required and. this lamp .heat shorten the life of the lamp as well as the insulation of the electric conductors which feed current to the lamp, but the lamp housing itself l becomes so hot that if it is inadvertently touched vbythe hand of the: operator aserious burn may result. Attempts-heretofore made to ventilate fixtures of this type have proven wholly inade- .quate in the solution of theproblem.

The present inventionis directed to a construction whereby the disadvantages referred to .are eliminated, the life of the lamp and its electrical connections are;materially prolonged and the lamp housing and its associated reflector. are

' maintained at all times at such temperature as "not to constitute a hazard of burning to the operator of the machine which may be equipped "-withsuch' alamp. v i l Another feature ofrthe invention ls'to so supportthe lamp housing that the parts thereof may be'efiectually bound together in a manner to permit the lamp housing or reflector to be grasped toallow-uof adjustment of. the lamp without shifting the parts ofthe lamp. housing '-with respect to one another or causing them to become loosened. 1

An important object of this invention is to provide 'an economical construction thoroughly I efllcient in its operation and absolutely trusty worthy in its-performance.-

Ilenerallyv speaking the presentinvention is characterized-by the provision of a housing. shell 1 wliich is preferablymetallic and with .a portion of 'which a' reflectOr may be made;integral. Positioned within the shell and spaced from =-the walls thereof by. av channeled spacing .memt ber isthe corey'of-a lamp socket; Jl herlamp is.

screwed into the. socket so as to occupy a position within the reflector. 'I he spacing member is provided with a series of longitudinally extending pasages, which open at their bottom to the interior of the reflector and communicate at their top with a chamberin the upperportion J of the shell while the top of the shell is provided with a number or. perforations. QThese perforationsand the passages or -channelsT'in the spacing member form, collectively, a nurnber of ventilating flues throug'hwhich the heat of the lamp is adapted to escape through the interior of the shell. It is noted in practice that, as the heat of the lamp passes through these flues, it carries withlit a considerable amount of relatively cool atmospheric air which, circulating as it does through the interior of the shell; keeps the shell and the reflector fairly cool and prevents overheating of the lamp socket core or the electrical connections and insulation associated therewith.

Features of the invention; other than those adverted to, will be apparent from the hereinafter detailed description andcla'ims, when read in conjunction with the accompanying drawing. I

The accompanying drawing illustrates one practical embodiment of the invention, but the construction therein shown is to'be understood as illustrative, only, and not asdefining the limits of thefinvention. I r l a Figure l isa central verticalsection through a housing embodying the present invention with the lamp socket core and electrical connections shown in elevation. Figure 2 shows the structural parts of the device dismantled and in substantially ,cooperative positions, I, 1 j MFlgure: 3 is a .planfview looking down upon the-top of the'housingshell.

Figure 4 is a .section on -Figure1.-. it;

Figure 5 is a perspective-view of thehousing showingthe same mounted ona fixture of the character referred to.

Figure 6 showsa fitting the 1158 44 of for supporting lamp housing upon the bracket of thefixture,

" this fitting being also indicated indotte d lines in Figure l...v g E In the. drawing, thehousing is shown as formed of two telescoping sections I and}: respectively. The upper section l isin the form of a substantially cylindricalshell open at its bottom and ,having a top wall 3. 1 Centrally of .thistop wall is .an upwardly zproi i a-in e ral ci i l gl 4 open at both ends and about the boss the top wall 3 of the shell is provided with a serie of annularly disposed openings or perforations 5. The lower shell section 2 telescopes into the upper shell section I. It is open at both its top and bottom and formed integral with its bottom is a shade or reflector 6 of any appropriate shape. At the junction between the reflector and the shell section 2 is formed a slight constriction I constituting, a seatfor a tubular spacer 8,.

The spacer 8' of insulating material is positioned in the shell sections l and 2. It is of a size to closely fit within the lower shell section 2 and seat at its bottom upon the constriction I and extend to a point adjacent the under side of the top wall 3 of the upper shell section. In

the outer surface of the spacer 8 are formed a series of parallel channels or passages 9 so that in cross axial section the spacer is externally castellated, providing the passages 9 which extend uninterruptedly and unobstructedly from the interior of the reflector 6 to the perforated top-wall 3 of the shell. An appropriate lamp socket core I is fitted into the interior of the spacer 8 which is provided intermediate its ends with a shoulder H on which the upper portion of: thecore seats,'as shown best in Figure 1, with theusual'brass'lamp socket I2 projecting downwardly to substantially thetop' of the reflector, so. that-fa lamp l3'may be crewed thereinto and occupy a position within the reflector. The shoulder l'l keepsthe socket core from falling'out of the bottom of the housing.

Current for energizing the lamp is fed to the core through insulating conductors l4 extending to the housing through BX cable [4a with the end of the cable protruding into. and preferably anchored within the tubular boss 4; as shown best in Figs. 1 and 5.

The telescoping sections I and 2 of the shell may be securedtogether in any appropriate way, but, in carrying out the present invention I secure these parts together and totheir mounting on the machine by means of a fitting shown in detail in Fig. 6. This fitting is formed of two complementary sheet metalstampings l5. Both stampings are provided at. their upper portions with opposed clamping jaws- IB adapted to grip the tubular boss 4 of the upper shell section I while the lower portions of the stampings. have opposed clamping jaws l1. adapted to grip the lower. shell section 2. Clamping bolts I8 draw the stampings together to secure them'to the lamp housing and thus secure the twoutelescopingsections of the housing; to one another. The stampings are moreover provided with rearwardly projecting lugs I 9 provided interiorly with sockets l or depressions forming the female units of a ball and socket joint. -The male unit of this joint is in the form". of a ball 2| indicated in Figure 1 as adapted to articulate in the opposing sockets 20. Thisball isrigid' with the lower end of a stay link 22;th'e opposite end of which has a similar ball receiveddn' opposing: sockets:

23 in the legs of a U-shaped clamp 24 which is clamped abouta tubular supportin'g arm 25' and in engagement with the cooperating ball on the upper end of the stay link, by a bolt 26.

The staylink 22 thus'has a=universaljoint con-. nection withboth the tubular supporting arm 25 and the lamp housing and reflector, therebyproviding for tilting adjustment of the 1amp=housing into the most efficient position to-illuminate prises the stampings l5 thus serves not Only t hold the sections of the housing shell together, but also serves as a universal mounting for the housing and reflector.

The parts of the housing are assembled after the manner indicated in Fig. 2; that is to say the spacer 8 is first lowered into the lower shell section 2 to seat upon the constriction 1. The core I0 is next introduced into the spacer 8 until it comes to a seat on the-shoulder H and the upper shell section I is then passed over the upper end of the lower shell section 2 to close and complete the housing shell. It will of course be understood that the wiring connections are made before assembling the parts and it will be noted from Fig. 2 that the upper shell section I, the lower shell section 2, and the spacer 8 are all slotted as indicated at 2'! to permit the passage of the switch button 28 of the socket core. A button type of core is shown in the drawing, although a pull chain socket core may be employed' if desired.

Whenthe" parts are assembled" as described with alamp screwed into thesocket 'core and in operation; heat rising from-the lamp and entraining cool air will pass upwardly through the channels orpassages 9 of the spacer and out through the perforations 5 of the SheIL'as-indicated by the arrows in Fig. 1. This circulation of air will keep-all parts of the structuresufilciently cool to preclude overheating and thus eliminate or minimize the disadvantages which would: be present in the absence of this ventilation.

Experience has shown that the parts keep unusually cool in the structure of my invention.

The'life of the lampis materially increased and the melting away oflamp contacts, so common in conventional constructions, is unknown with the structure of the present'inventioni Theinsulation of the electricalconnections I 4' is-not unduly heated and anoperator may safely graspthe exterior of thehousing with: a bare hand. to. move the lampinto the desired adjustment without fear of burning; The parts entering into the structure: may be economicallymanufactured: and expeditiously assembled and; with the type of mounting fitting which. I have described. close tolerances between. the: parts are unnecessary.

The. foregoing. detailed: description sets forth the: inventionin its: preferred? practical. form, but the; invention: is. to: be understood as: fully commensurate withtheappendedclaimsa Having. thus fully: described the. invention; what I claim as newand: desire tosecure-by. Letters ..Patent is:

1. A lamp housing comprising. a shellopen at its bottom andhavi'ng in its. top-walla series of ventilating; openings; an insulatedz spacer fitted into-the shelland extending; for substantially the full length: thereof, said insulating spacer being provided with: longitudinal passages: extending. for thefull length: of the spacer to provide: ln'gconjunction with the alined openingsin: the top: of the shell a plurality of unobstructed straightthrough. flues extending.- longitudinally through theshell, a2 lamp socketl core fitted into the interior of: the spacer and provided; therein at. its

lower end with a sockettorre'ceivaa;threaded:base of. an incandescent lamp; and alamp; shade carried by the lower end ofv th'ei shell,,whereby heat may: escape: from the-interior ofa'the shadez in: an

i entirely' upwarcldirection byway of: saidzstraightthework to be done. The fitting which coma through flues'and out of; the'top; of thenshell.

2. A .lamp housing; comprising: upper and: lower telescoping shell v sections having a. sliding fitbetween them, the upper of which is provided in its top with ventilating openings and in its side wall with an aperture for the passage of a switch operating member, the lower shell section having a registering aperture in its side wall for the passage of the switch operating member and said side wall being otherwise sealed, a lamp shade at the lower end of the lower shell section, an internal constriction also at the lower end of the lower shell section, a tubular spacer within thelower shell section and seated at its lower end upon said constriction and provided with unobstructed longitudinal passages forming with the ventilating openings in the upper shell section unobstructed straight-through flues for the escape of heated air from the shade through the lamp housing, a lamp socket core positioned within and embraced by the spacer with its switch operating member extending through the registering apertures in the side Walls of both shell sections, wiring connections passing through and insulated from the upper shell section and secured to the terminals of the socket core, and means for securing said shell sections in telescoping relation.

3. A lamp housing comprising upper and lower telescoping shell sections having a sliding fit between them, the upper of which is provided in its top with ventilating openings and the lower of which has an aperture in its side wall for the passage of the switch operating member and said side wall being otherwise sealed, a lamp shade at the lower end of the lower shell section, an internal constriction also at the lower end of said lower shell section, a tubular spacer within the lower shell section and seated at its lower end upon said constriction and provided with unobstructed longitudinal passages forming with the ventilating openings in the upper shell section unobstructed straight-through flues for the escape of heated air from the shade through the lamp housing, a lamp socket core positioned within and embraced by the spacer with its switch operating member extending through the aperture in the side wall of the lower shell section, wiring connections passing through and insulated from the lower shell section and secured to the terminals of the socket core, and means for securing said shell sections in telescoping relation.

4. A lamp housing comprising upper and lower telescoping shell sections having a sliding fit between them, the upper of which is provided in its top with ventilating openings and in its side wall with an aperture for the passage of a switch operating member, the lower shell section having a registering aperture in its side wall for the passage of the switch operating member and said side wall being otherwise sealed, a lamp shade at the lower end of the lower shell section, an internal constriction also at the lower end of the lower shell section, a tubular spacer within the lower shell section and seated at its lower end upon said constriction and provided with unobstructed longitudinal passages forming with the ventilating openings in the upper shell section unobstructed straight-through flues for the escape of heated air from the shade through the lamp housing, a lamp socket core positioned within and embraced by the spacer with its switch operating member extending through the registering apertures in the side walls of both shell sections, wiring connections passing through and insulated from the upper shell section and secured to the terminals of the socket core, means for securing said shell sections in telescoping relation and for supporting the housing, said means including a fitting comprising complementary stampings provided at their upper portions with a pair of opposed complementary clamping jaws adapted to grip the upper shell section and at their lower portions with an additional pair of opposed complementary clamping jaws adapted to grip the lower shell section, said stampings also having opposed interior sockets forming the female unit of a ball and socket joint, a male articulating supporting element seated in said sockets, and means for drawing the stampings toward one another to clamp both pairs of jaws of the stampings to the upper and lower shell sections and simultaneously produce the desired friction between the ball and socket units of said universal joint.

ALBERT LIABASTRE.

Images