US991575A - Projecting apparatus. - Google Patents

Description

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asi'if" iiii'JEc'iiiNG APPARATS, .Hawnsi' C. Wni'rn and CLAaiiNcr.' W-

Wiiira, North' Bonnin ton, Vt., assignors to H. C. White Co.

orth Bennington); Vt., a Corporation of-Vermont. iled oci. s, i010. serial No. assistita` 'lo all whom it may concern:

State .of Vermont, have invented certain new andv useful Projecting Apparatus, of which 1 the following is a s ecifieation.

Our invention re ates to picture proJectto apparay tus adapted to proJect by re ection from laced within the'appara tus, and involves in part features illustrated but not claimed in our application for Lutters Patent filed July 5, 1910, Sr. No. 2

ing apparatus, and particular] opaque pictures Our invention comprises a novel reflector for reflecting light from one or more sources of illumination upon the icturcs to be ro- 1 jected, the said reflector ein designe to give'a particularly uniform il umination of -the said ctures while being of a very simple an inexpensive nature.

AOur invention further comprises an imoved construction of the apparatusvherey eflicient ventilation is o tained; an improved ventilator head and light guard; and an im roved lens mountin all as hereinafter escribed and particu arly pointed out in the appended claims.

The o jects of our invention are' to iiuprove the construction and design of picture projecting apparatus such as referred to, and to (produce apparatus which, while siniple an relatively inexpensive, and easy to operate, shall have relatively high efliciency and which sliallbe so ventilated and the exterior of which shalll be so protected, that there shall be no overheated exterior parts which ma burn the hands of the operator.

We wil new roceed to describe our invention with re erence to the accom anying drawings, illustrating one form o inachine or apparatus embodying our invention. l

In said' drawings: Fi elevation of the projecting lantern; Fig. 2 shows a vertical section of the `apparatus on the irregular section-line M of Fin.V 8,

l andl looking from the rear; Fig. 3 shows a section of the apparatus horizontal section of the apparatus, the sec. tion being taken just .below the top of the light chamber; and Fig, 4 shows a vertical taken on its optical axis.

The lantern comprises a box'or case 1, f

i Hrovided, on its front side, with an inwardly aring light shield 2, and with an outwardly projecjnngiens curryigsieeve 's' adapted otally mounted upon a door hinge the rear wall of the box or case 1. To furre 1 shows a frontl related part of the light emitted from said burners and which otherwise would not impnge to receive within it a lens tube 4. In the particular construction shown two -sources I of illumination are provided, one on each side ofthe optical axis of the apparatus, s .the particular surces of illumination shown Abeing acetylene gas burners 5 so placed that light from them will illuminate a picture i v carried by the curved picture holder 6 iivto L'l ther increase the illumination of a picture f carried by this picture carrier 6, reflectors i" 8 are provided, one for each of the two burners`5, said reflectors each having singularly surfaces 9, 10, 11, 3, so arrange relative to the axis of the burners 5, as to reflect upon a picture carried bv the picture carrier 6, the greater 5 upon said picture, and furthermore to distribute the so reflected light with approximute uniformity over the said picture. i Bv dotted lines we have indicated in Fig. i l.El a few of the rays of light emitted lfrom one i -of the burners 5 and thence reflected by the corresponding reflector 8 toward the picture carrier 6, from which it will be seen that in Borne c ases the light rays are reflected toward said picture carrier by single reflection, and in ot er cases by dou le reflection, and that the rays are so reflected as to distribute the light quite uniformly over the surface of a picture carried by said picture carrier. In. practico these reflectors 8 are formed of bri ht-surfaced sheet metal bent to the form in icated, the said form being suchthat the sheet of metal to form the reflector may be bent readily to the desired form b means of simple dies, and these reflectors a so form in efl'ect inner walls for the greater portion of the sides of the box 1, there being between these reflectors and the outer side walls of th e box, air s aces 14 into which air is admitted throug openings 15 in the bottom of box 1. Because of the double walls so prov ided, and because practically all of the light and heat rays emitted froml the burners 5 inipinge, either directly upon the picture carried y the carrier 6, or upon one or the other of the said reflectors, or upon the ylight guard 2 and because of the.efiicient ventilation e the air space between the and theoateriwalls of box 1. these outer walls remain quite cool in practice, so that the operator will not burn his hands in case he accidentally touches the sides of the lantern.

To provide for the escape of roducts of combustion the lantern is provi( ed, directly above'each burner 5, with a ventlating head and light guard 16 consisting of an inner shell 17 fitting into an o ening in the to wall of box 1 and provitcd with a closci i drical light guiirdQOsurroun ing this inner shell 17 and having noi openingsgin' its side 'j" i but provided .with a topy opening/21,v the zu i diameter of which! is only very slightly`l` provided for the upward 'passage of the products of combustion, the gases not being complelled to travel downward at any point indicated in Ii s. 2 and 4, and in the interspace so provi ed we customarily place asi of focus of the apparatus. In an apparatus g of this sort it is very important to provide a lens mounting which shall be at once sim-4 head 16.

i escape of air from the air spaces 14 over `ple and inexpensive end shallpermit ready i their exact predetermined positions. In the adiipted to form.a stop 5 a spring top 18 and with later'alopenin 19; a cylin-m greatervthan that ofthe 'shell"l9,-` andfa f rth n 2 c v A u er outer she 2 constltutmg the 'I cept'that, since the rear end of lens tu guard, and open at the top, and 'providedy near its bottom, with airinlet openings22. -S Between shells 20 and 22 an'airspace-QB is linelosed which serves to keep the shell 22 quite cool so that the operator may not ard, so that if, as is customarily ward, while a nearly direct upward path is in t eir assage through the ventilatin iurthermore, since the reflectors 'do not extend quite to the top of the box 1, a space is provided, between the top ed of the reflectors and the top of box 1, for t e the tops of reflectors 8, into t e Ventilating head and so upward, the construction also' being such that the products of combustion in passing from the burner upward to the ventilating head have a strong inducing action, tending to draw air from these air spaces 14, and also from the front air space 2.4 of the box, (i. e., the space around the light guard 2) so that there is constant change of air oing on through these air spaces, while t e lantern is in operation, whereby the outer walls of these air spaces .l ae maintained at a relatively low temperll lire.

The top of the box 1 is double, as clearly bestes or other suitable insulatin material frequizintly differ more or less in thickness, lvwo in practice provide spring rings 30 of diierentthcknesses, using a spring ring of vonezthickness or another, according to the thickness-of the lens, which will hold that lens in 'a roperposition. The rear lens 31 is carried a cap 32 similar to cap 27,bx

lis to slidewithin sleeve 3, this ca 32 fits lvi'itliinytube 4 instead of over it, t us prog f viding u smooth outer surface on lens tube 'i l -4 for close engagement with theinterior of g ing asto 26, besi es formin ens tube during handling.

and claimed the curved picture carrier 6 herein illustrated and described, and therefore it is unnecessary in this specification 25, to keep the outer top wall relatively cool.

The lens tube 4 is arranged to slide in and out within the sleeve 8 to permit adjustment removal of the lenses for cleaniri removal of condensed moisture, etc., and w iich shall y provide for the easy returnof the lenses to `lens 28. Sincethese lenses as manufac ured,

'to describe the' reason for the curvature of such picture carrier; and for the same reason we do not in this specification claim the said curved picture carrier.

What we claim is:-

comprising a box carrier, a lurality of sourcesof,illumi`na tion locate on op osite sides of the optical laxis, and arrange to illuminate [i icture on said carrier, inner walls for said box said walls extending from the bottom of said box to within a short distance of the -topof said box partly inclosing the said sources of illumination and constituting tlectors, the said box provided with ventilating openings for the spaces between said inner walls and the outer wal-ls of the box, and ventilators for the interior of the box and said' air spaces, located above said Isources of illumination.

2. A projecting lantern such as described. comprising a box provided with a picture carrier, a lurality of sources of illuminaltion locate on op site sides of the optical axis, and arrangeoto illuminate a picture .en saisi. eerder, inner. wells for wdabox said walls extending from the bottom of said box to within a shortl distance of the top of said box partly surrounding said sources of illumination and constituting reflectors, there being air spaces between said inner walls and the outer walls of the box, the box being provided with ventilating openings communicating with said air spaces, the said inner walls extending up ward a distance less than the full interior height of the box, and ventilators over said sources of illumination.

il. projecting lantern comprising in combination a box provided with a picture holder, ineens within the box for illuminating a fpicture carried thereby, and a ventilator or said box comprising a sleeve open slceve. An inwardly extendin bead 33 is U rovided near. the rear end of tu e 4, formr for lens carrier 32. Beads 33 and lens stops, stien the lens tube 4, providing sufiicient strength to 1fpreserve the desired cylindrical -form of the In our previous application, Sr. No. 570,325, above mentioned, we have described 1. A projecting lantern such iis described, provided with a picture `f top at the bottom and there in communication with the interior of the box, closed at the and having lateral side o enings, a light shield comprising a sleeve tting over said first mentioned sleeve, closed at the y sides and havin a top opening, and a heat guard surroun ing said second mentioned comprising a box .A outer side walls said inner walls extending g from the bottom of said box to within a short distance of the top of said box, said vvbox being provided with o enin s connecting space between said wal s wit air, a source of illumination within said box, and a ventilator over such source of illumination, and arranged to receive heated inlet of said ventilator, whereb sleeve and.consisting of a sleeve open at the f. top and havin lateral perforations. 4. A projecting lantern such as described rovided with inner an the outer gases therefrom, the said air space also in communication, near the top of the box, with the space immediately adjacent to the thehot. gases from the source of illumination, in

a passing into the ventilator, induce a How of air through said air space.

In testimony whereof we have signed this specification in the presence of two subscribing witnesses.

HAWLEY C. WHITE. CLARENCE W. WHITE. Witnesses:

MrnoN H. Jonas, Invmo C. COBB.

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