US 1965865 A
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July 10,' 1934- J. r1-4'GMP-sonA 1,965,865
SAFE-'TY LIGHT Filed ame 29. 1932 1965965 cm IN 12a/23" Pat-eared July 10,1934
John L. Thollfllwn. l'kkeley, Calif. y Application .Jane ze. 1932,24. 615,901
4 claims (icl. 12s-.en
This invention relates to`lg=hts that may be used in places' and for purposes Whe-rafa higher degreeoi safety than is possible with present day lights -is desired.
An object of the invention is the production of a light emitting body, the temperature of Ywhich is not raised to any substantial degree by the light.
rays or by the conditions attendant upon their emission'. y
Anotherobject .of the invention is the produc-- tion of a light emitting body which has a much less tendency to break than present day devices.l
apparent on reading the appended specification takenv in connection with the accompanying drawing, in Which- Fig. l is aview partially in section of a' complete device according to my invention.
Figs. 2 to -6, inclusive," are views partially .in section illustrating various detailsv and modifications, while Fig. 7 isan elevati-on of a further modification.
I provide a casing 1l, this preferably compris.- ing a cylindrical wall 12 which may b e of hard rubber, bakelite, or any other desired material useful for the purpose, which is .interiorly screw threaded as at 13 at the llower end thereof to accommodate a correspondingly threaded closure cap 14 having a perforation therein to accommodate the flexible .electric cord 15, the Wires of which supply Acurrent to an electric light 1'6,
which preferably has a concentrated filament 17 v and which is preferably backed by a reflector-18. The interior of the casing is preferably lined with a reflector" 19 and especially'that part there'- of which is above the lamp. i
The lamp may be mounted within -the casing. in any suitable manner as, .for example. on a hollow standard 20 of conducting materiel fastened to the cap 14' by one -or morescrews 21 passing through a. foot orming apart of the standard or suitably attached thereto. 'Withinthe stan-dard I proyideaoyiindrical member 22 of insulating material having a central perforation open at.
boh ends, the upper opening being somewhat smaller than the balance or" the perforation. A
conductng plug member 23 is screwthreaded into the lower end of the cylindrical .member 22, Whilel at the upper end is a plunger member 24 slidable in the opening but .held from passing outwardly therefrom by the enlarged collar 25 thereon; A 'compression spring 6 is interposed betwee-n the plug member-and the' plunger to force 1 the plunger resiliently upwardly. A second compression spring 27 is interposed between the stop member ,2,8 on the standard and thereilector 18.
The lamp is provided with two `contacts 29 which are adapted to enter a bayonet joint 30 inthe standard which is formed of such shape .that the lamp' is first pushed down and then turned to hold it in lowered position. As the lamp is pushed downwardly in place, it forces down t-'ne reflector which vis always maintained in the correct position by the spring 27, whilevthe-.eontact 3l of the lamp is always maintained against the plunger 2i by the upward pressure against saidplunger of the spring 26. The basemem'ber 32 forms the other contact. of the lamp, this being the purpose of 'convenicncefa switch is interposed in the circuit and this may be carried onthe casing as at 33, and when the switch is used in such position, one lead wire is connected to one Contact of the switch., as at 34, ivhile the other 'contact ofw-l Athe switch isv electrically connected to the Stand' ard orto the stop member 28 thereon. by aloopedflexible connectorl'og'j-I'negswitch, o course.A is pro vifddiitl'n'operating member 36 l'oamaking and breaking the circuit. A
'lt is desirablewith a view to maximum e mciency, that no 4light rays pass from Athe inside of the casing tothe outside thereof, except through an opening at the top thereof, although for .pur-4 pose of cooling, the casing may be provided with Ventilating openings 3'?, which preferably are other than-rectilinear to avoid bright spots as much as possible.
Within the opening `at the top of the casing I" in electrical contact `with the standard 20. For
have positioned a rod 38 consisting of quartz (SiOz), the surface of whichl is preferably polishcd or bright. This rod is' provided with apro- Avtective shield 39 which vis preferably strong and im non-transparent to light, it being preferred that protective 'shield be not indirect or `adhesive contactfwith said rod so that there `will beat least a 'slight -ai-r filmin between. The lprotective shield may be made in any convenient manner, lo;
as for' example. by molding. any nonftransparent material into' shape and thenslippingit over lthe v rod, by wrapping a copper or other vmetal band spil-ally about the rod and vthen electro-.plating then, if desired, .be electro-pl-ated with nickel, or said shield may be m-adein any other suitable mannen I prefer not to mold and bake nis.-A te'r'i'al onto the rod, since this sometimes results inra 'direct-contact between messina and me u',
have 'it enter the opening at thfillt'fel bart of l2!! with c pper to form a unitary tube which 'may 1m Il m i,shape.
` is-inserted into the casing.;
2 the casing so thatit mayac-t asta r'einioroement of and 'support therefor. The shield nts easily but snugly into the opening at the top of the'cas'ins and for the purpose. of holding it in 'fixed posi, 5' tion when inserted, I provide soft rubber washers 40 in the wall of the opening at the topiof the casing 11, and` I provide a stop 'member 41 on the shield inni-der that therod rand shield may be inserted just the right 'distance. With the structure thus lfar described and with the lamp emitting light rays, light is emitted at 'the upper end whether said rodbe straight or-bent, irrespective. of the degree or kind 0IA bending. irrespective ot 15 whether 'or not the shield extends beyond. the
bend, irrespective o1 whether or not theshield extends to the very end of the rod, and irrespective of the shape of theernittng end of `the rod. For the purpose of illustration only,.I have show-n on the drawing various teatures. as for example, i'n Fig. 1, wherein the rod is shown as bent at an obtuse angle and with the shield extending not quite to the bend, and with this arrangement of features light will be emitted in the direction of .25 the arrowZ, while some light will also be emitted in the direction of the arrow 43. It is to be understood, vvnow-ever. that the shield may be ex'- tended beyond the obtuse angle 'almost to the end of therod or quite to the end` of the rod, as hereinafter described, with respect to Figs. 3 and 7. and it is also to be understood'that'the end of the rod may have any desired shape, two examples of which are hereinafter described withv respect to Figs. 4 and 6, and it is also to be 'understood that the rod itself may have any desired In Fig. 2 I trate the rod as 'peut at an acute angle and withthe casing extending almost to said angle, but itis to be understood that all 40 the variants possible l'with the obtuse' angled device are applicable to the acute angled device. In the device of Fig. 2 'light' will he emitted in 'the direction of the -arrow 44 .and some light will alsobe emitted in the direction of .the arrow 45.
In Fig. .3 I illustrate the r'od as bent at a right angle with the vshield extending beyond the angle 'so that practically .all the lightl will be emitted in the direction of the arrow 4S; It is yto be understood, however, that there is no particular relationship between a right angled bend and the shield extending beyond said bend.and that all the variants possible with respect to the mod-iiications of Figs. 1 and- Zara-applicable to the modification of Fig; 3. Y
'5 lf ln Fig. 4 I shoiv'4 the end of the rod as having an oblique face 4'1 and in thistypeof device light will be emitted in the direction of the 'arrow 48,
while some light will be emitted in other direc-'- tionS. Y
In Fig 5 I show the rod as being tapered; and
I also show another vfeature not particularly related -to the tapered feature, namely, 'thephield as not extending to the very end of the rod-which i Aand also a rui-ther vfeature not particularly related to the .other two just mentioned, namely, that ot the rod being straight and unbent.-
f Where it is found desirable, the "emitting end of the rod may be lens shaped, as at .49 (fi'gf, it being understood that suitable lens may be applied to any variant 0 1 rod. Q
The shield ,may be extended right .for :other features.
:a number of rods land shields .of different mes,
seme being possibly o! the same types, may
of the rod 38. irrespective ot este the' emitting end of the rod with variant o! es .alestra-ted.. -lir example, in
My novel-safety lampis-appiicable .to medical and surgical work .since 'the rod and shield may be removed, sterilized and-replaced esa unl-t, and
used 'with' the same source of light. It canalso be 1. A safety iight comprising a nono-w handle forming a chamber, an electric. fla-mp bulb Within Said chamber, means tov supply lelectric vt. 1.'u *rent tosaid bulb. .saidhandle having .an opening cotri- 1 munioa'ting with; said chamber' anddn line with said bulb, -a quartz rod 'adaptedv to be inserted into and removed from said opening, said handle having *ortuo'us -periorations therethrough and .communicating with'tlie outsldethereoi and with said chamber automatically to cause ventilation of said chamber on gen-'eration of heat therein and to interrupt light rays tending 'to exit therethrough. i
2. A safety light comprising .a hollow' handle forming a chamber', .an electric lamp bulb within said chamber, means -to supply electric current to said bulb, a. 'switch on said the supply of currentto sa-i'd bulb, said handle having -an opening communicating with .said
chamber and in line with said bulb, 'a quartz -rod adapted to -be inserted into and removed from said opening. i
D 3. A safetyllght comprising a .hollow 'handle forming a chamber, an said chamber, saidla'rnp said cla-amber, means to supply said bulb. a sititch-on-said handle iorcontrolling the supply of current to said bulb, said handle having 'an open-ing communicating with seid chamber and line with said bulb, a quartz rod having a protective shield lthereerourni 'adapted to oe inserted into and removed-rromsaldopening. means for mounting said quartz rod -lighttight and resiliently in :said opening. having perforetions therethrough and' spaced lion` .gituciin-ally thereof and cvmtnlm-icating :with
bulb being smaller than generation otheat therein.
4'. A safety light comprising a hollowlhan'clle forming `a chamber, an electric lamp bulb within 'said' chamber, said handle having'an opening. in optical communi-cation with said chamberjand ln line 'with said' bulb, a.' dua'rtzv'rod in said-openirm,
porforations. in said handle above 'and below l:said bulb, reflecting means i light rays 'ernanatlng trom A'said bulb to sal-d rod.
the outer -end of said perforation-s bulb or re'ected by said renee/ ting means.
' .tous 1n. recursos.
used under any circumstances where 'a cold light- -source is desired, 'arid 'it may haveother uses al handle'for con-trolling electric lamp bulb within electric current to ssi-d baume in said eliarnbervto reect beine-cancelli' Y out o! line with light rays' emanating from-said