US2324384A

US2324384A - Ultraviolet screen for fluorescent lamps

Info

Publication number: US2324384A
Application number: US400469A
Authority: US
Inventors: Warren G Grimes
Original assignee: Individual
Current assignee: Individual
Priority date: 1941-06-30
Filing date: 1941-06-30
Publication date: 1943-07-13
Anticipated expiration: 1960-07-13

Description

NIV 0 nh n C rl d U A D BSO-1.1

C-IW" 2,324,384

ULTRAVIOLET SCREEN Fon FLUORESCENT LAMPS July 13,'"1943,

Filed June 50, 1941 0R IN 24o/8.16

l l i l f Patented July 13; 1943 UNITE o STATES PATENT OFFICE ULTRAVIOLET'SCREEN FR' FLUORESCENT IAMPS 7 Claims.

rLhis invention relatesto an ultra-violet. screen for a uorescent lamp and has. for an object to providean. improved ultra-violetscreenl for use on a fluorescent lamp, which screen' is of-'the type that it can-be-easily-and quickly manually f, mani-pulaterlf to permit visiblel light to pass .therethrough or tolcut oi the visible light and taper.- mi-t. or-Iligpltrar vio lcnliehtlrimssiherethmueh;

A tur'ther object of the invention. is to provide a fixture for an ultra-violet screen for a fluoo rescent light especially adaptable for. use'asan instrument lightperticularly onA aircraft, having means; for shading the-light from-'the opter.-` axtrsfeyes while making/theA same easily usable for the-.purpose intended., l5

4-Still a further object of this invention is to provide anxultra--violet screen and ar mounting` for the` screen-and a iuorescent lamp to be'used therewith, which can be inexpensively manufactured, easilyv assembled andd quickly disassembled 2H and. -reassembled'whenever necessary, for accessto. or replacement-of the uorescent bulb within thexture. ,i

With-.the-lituegoing and other objects in View; as will hereinafter become apparent, this' inven- 2;, tion`- comprises the combinations, constructions and arrangements-of parts hereinafter set'forth, disclosed, claimedand illustrated-'in the accompanying drawing.

In the drawing, j y Fig. `l .is apartlyv sectlonalviewpf: the` lamp, fixture and screen 'or this.V invention,v being subs stantially-on line I-to fFig., 2:1 vf. f -`.:'ig. 2l is a front-view 'of the-.lamp-rand' xture looking. in they directionof thearrowlon Fig.-k;

Fig..3isa perspective view of' the'screen-hold- 'l ing rim; and l 4 is a perspective view of the amplementary units .formi-ng the screen. p

There isshown at I0 the' fixture of .this iri 4! vention comprising a mounting bracketV II on Whichis vadlustablysecured the fixture body l2; WithinV the xture body I2 is provided va lamp socket I 3'for holding a fluorescentflamp i4 therewithin, ythe inner surface f5.0f the xture body 4: l2, being provided with the customary polished? reecting surface. The open end of. the' xture bodyv I2, throughwh-ich the lampl isv to be in-4 serted, is provided with a reduced neck I6 so as to receive thereon the complementary counter- :in bore I1 of a screen-holding rim I3.

This screen-holding rim consists of two rings 2li and 2|, the ring 2l)A having the aforementioned counterbore I'I at one edge thereof and; being providedx at itsl other edge with a reduced:| mi

( Cl. Z110-8.16)

neck 22., to rotatably receiveithe other ring 2I thereon. Extending oircumferentially aboutl and through reduced neck 22 are twooppositely disposed slots-23, each slot extending 99 degrees thereabout. 4Projecting-through the ring 2I are two oppositely disposed rivets 24, one rivet extending into each of the slots 23. As will be apparent, these rivets 24 and slots 23 serve to limit the rotation of. the ring 2l on the ring 20 to 90f-degrees, and at thesame time prevent longitudinalseparationofthe-two rings 20 and 2l. Thecounterbore I1 ofl 2D isprovided vwith two longitudinal edge-.slots 2B (which may be angular or. bayonet .j oint. vtypeslots, if, desired) which cooperate with stud screws 21 in securing the4 rim I8 on the fixture .body I2. y

The ultra-violet screen 28 consists cf two iden.- ticall units 3U' molded and ground to the form shown. Each unitl is made of suitable material capable of transmitting ultra-violet light therethrough, one such suitable ,material on the market being commercially, known as Corex." Each unit 30 consists of a rounddisc of proper thickness, and each disc is provided with` one or two notches. 3I and also with two diametrically opposed sectcr-shaped. openings 32'. Each sector is of 90 degrees, but its right angle 33 is slightly displaced along a'radius from the center, so that, when the two units or discs 3U are brought together in face to face relation, they may, by relative rotation, one to the other, be 4brought into af position with'their openings in coincidence, capableof transmitting visible light therethrough, or be rotated 90 degrees, one to the other, to block oil* all visible light, but transmit ultra-Violet light. w

To properly mount these two discs 30 for such controllable vrelative rotation,v the reduced neck 22 of ring 20 is provided with one or two exten-ding lingers 34 coinciding in location withthe notches 3'I of one disc 30, so that, when one disc 30- is placed into the rim I8, the finger 34 holds the rst disc 30 against rotation relative to the ring 22. Then the second disc is placed into rim I8 against the rst disc, and studs or rivets 35, suitably located about the ring 2I, extend'into the notches 3I of the second disc 30. Next an annular spring 3G is inserted within an annular'l notch within a iiange 31 on the edge of ring 2| to hold the second or outer disc flush against the rst or inner disc.

In operation, with the discs 30 of the ultraviolet screen 28 mounted in the rim I8 and on the. fixture body I2 with the fluorescent lamp I4 in action, the operator may have visible or ultraviolet light at will by merely grasping the knurling 25 on ring 2l and rotating it a quarter turn in either direction. He may easily direct the light by turning the fixture about on its universal mounting 38.

Obviously, if desired, the sector-shaped openings 32 may be filled with any desired transparent visible and ultra-violet light transmitting material, either a suitable glass or a suitable plastic c osition. In addition, if desired, a- Fa'l'nlisqxtlment to both visible and ultraviolet light may be placed between the spring 3`|- and the outer disc 30, so as to prevent the possibility of moisture getting into the fixture body to affect the reflecting surface l5.

While the device has been shown and the structure has been described in detail, it is obvious that this invention is not to be considered limited to the exact form disclosed and that changes may be made therein within the scope of what is claimed without departing from the spirit of the invention. v

Having thus set forth and disclosed the nature of this invention, what is claimed is:

1. An ultra-violet light comprising a xture body adapted to receive an ultra-violetI and visible light producting lamp therein and a screen through whichY the beams from the lamp may pass, said screen being capable of optionally transmittingr either visible lightA or ultra-violet light without any visible light, said screen comprising apair of substantially identical circular soliddisc unit, each of said units having visible light transmitting sector shaped openings therethrough, said openingsoccupying less than onehalf of the area of each unit, and means for mounting said units in said xture body face to face-whereby one of said units may be peripherally rotated relative to the other of said units to bring the openings in each unit eitherinto alignment to transmit visible light or out of alignment to block olf visible light whereby only ultra-violet light may pass therethrough. 2. An ultra-violet light comprising a fixture body adapted to receive an ultra-violet and visible light producing lamp therein and a screen through which the beams from the lamp may pass, said screen being capable of optionally transmitting either visible light or ultra-violet light without any visible light, said screen comprising a pair of substantially identical circular solid disc units, each of said units having. visible light transmitting sector shaped. openings therethrough, said openings occupying less than onehalf of the area of leach unit, and means for mounting said units in said xture body face to face wherebyA one of said unitsmay be peripherally rotated relative to the other of said units to bring the openings in each'uniteither inta alignment to transmit visible light or out of alignment to block oif visible light whereby only ultra-violet' light may pass therethrough, said mounting means comprising means: for securing one of said units against peripheral rotation, and means for supporting the other of saidunits face to facewith the rst of said units for peripheral rotation, said supporting means having means on the periphery thereof for manual manipulation of said peripherally rotatable unit.

3. An ultra-violet light and visible light transmitting screen comprising a pair of substantially identical solid screen discs, each made of ultraviolet transmitting and visible light blocking material, each of said discs having visible light transmitting sector shaped openings therethrough, said openings excluding the centers of said discs, said openings comprising less than one-half the area of said discs, and means for mounting said discs in face to face juxtaposition for relative rotation of one of said discs to the other of said discs, whereby the openings in said discs may be brought into alignment to transmit visible light or may be moved completely out of alignment to block oi visible lightand transmit only ultra-violet light.

4. An ultra-violet light and visible light transmitting screen comprising a pair of substantially videntical screen discs, each made of ultra-violet transmitting and visible light blocking material, each of said discs having visible light transmitting openings therethrough, said openings excluding the centers of said discs, said openings comprising less than one-half the area of said discs, and means for mounting said discs in juxtaposition-for relative rotation of one of said discs to the4 other of said discs, whereby the openings in said discs may bev brought into alignment to transmit visibleflight or may be moved completely out offalignment to block oil visible light and transmit only ultra-violet light, said mounting meansy including means for holding one disc againstv rotation and manually manipulatable means for facilitating the'rotation of the other disc;

5. An ultra-violet light and visible light transmitting screen comprising a pair of substantially identical screen discs, each made of ultra-violet transmitting andA visible light blocking material, each of said discs having. visible light transmitting openings therethrough, said openings excludingithe centers of' said discs, said openings comprising less than one-half the area of said discs, means for mounting said discs in juxtaposition for relative rotation of one of said discs to the other of said discs, whereby the openings in said discs may be -brought into alignment toA transmit visible light or may be moved completely out of alignment to block oil. visible light and transmit only ultra-violet light, said mounting means including peripheral irregularities on said discs,'and means on said mounting means cooperating with said peripheral irregularities.

6. A lamp xture including an ultra-violet light and visible light transmitting screen comprising a pair of substantially identical screen discs, each made of ultra-violet transmitting and visible light blocking material, each of said discs having visible light transmitting openings therethrough, said openings excluding the centers of said'discs, said openings comprising less than one-half the area of said discs, means for mounting said discs in juxtaposition for relative rotation-of one of said discs tothe other of said discs, whereby the openings in said discs may be brought into alignment to transmit visible light or may be moved completely out of alignment to block oil visible light' and transmit only ultra-violet light, said mount` ing means including peripheral irregularities on said discs, a detachable lamp :lixture rim, said rim comprising a pair of relatively rotatable rings, cooperating means on said rings permitting limited relative rotation thereof one to the other, and means on saidrings cooperating with saidv disc peripheral irregularities causing each disc to be xed relative to its ring.

'7. A lamp fixture including an ultra-violet light and visible light transmittingscreen comprising a pair `of substantially identical screen discs, each made of ultra-violet transmitting and vislble OUCH bll HUUIH light blocking material, each of said discs having visible light transmitting openings therethrough, said openings excluding the centers of said discs, said openings comprising less than one-half the area of said discs, means for mounting said discs in juxtaposition for relative rotation of one of said discs to the other of said discs, whereby the openings in said discs may be brought into alignment to transmit visible light or may be moved completely out of alignment to block off visible light and transmit only ultra-violet light, said mounting means including peripheral irregularities on said discs, a detachable lamp xture rim, said rim comprising a pair of relatively rotatable rings, cooperating means on said rings permitting limited relative rotation thereof one to the other, and means on said rings cooperating with said disc peripheral irregularities causing each disc to be xed relative to its ring, said disc cooperating means comprising protruding iinger means on one ring and protruding stud means on the l0 other ring.

WARREN G. GRIMES.