US1798567A - Cabinet for arc lamps - Google Patents

Description

March 31, 1931. J. H. WAGENHORST CABINET FOR ARC LAMPS Filed may 15, 1925 4 Sheets.5heet 1 March 31, 1931. J 'H WAGENHORST I 1,798,567

CABINET FOR ARC LAMPS Filed May 15, 1,923 4 Sheets-Sheet 2 March 31, 1931.

Y J. H. WAGENHORST 1,798,567

CABINET FOR ARC LAMPS Filed May 15, 1923 4 SheetsSheet 3 March 31, 1931.

'IIIII(IIIIlI/Illllll nnmnuunum J. H. WAGENHORST CABINET FOR ARC LAMPS Filed May 15, 1923 4 Sheets-Sheet 4 Patented Mar. 31', 1931 UNITED STATES JAMES H. WAGENHORST,

F JACKSON, 'MICHIGA-N CABINET FOR ARC TAMPS Application filed Illa-y 15,

This invention relates to a cabinet for an arc lamp, used .for photographicor similar purposes and has for its object-to provide a cabinet or hood which will protect'the arcs from air blasts and also provide abetter light distribution as the cabinet is not only a reflector but is'also constructed for use with a curtain whereby diffusion and modification of the light can be obtained.

Another object of the invention is ,to pro- .vide a cabinetor hoodto which an-arclamp is attached .and the combined arc-lampand cabinet connected asa unit-to anadjustable stand, or frame such as. disclosed in my application Serial No. 580,035, filed vAugust 7,

The are lamp preferably employedin connection withthis novel-construction of cabinet is the arc-lamp disclosed in mypatent, No.

1,581,408, lSSH6d April 20, 1926, on.,my application =Serial No. 328,791, filed Qjctober 6, 19.19,but it will of course beunderstood that lamps of other constructions .may be remiployed, and" the unit may. also be connected to otherforms of stands orit could be mounted or-suspended in a studio in any suitable. manner.

It is also antobject ofthe invention to provide a cabinet which can bemoved up and down andalso adjusted tozany angle gsothat light can'be directed and distributed ,as de- 'siredandanother object is to provide foradjustment of-the curtain or screenboth-as to extent and position so that improvement in light'modification and controlcan'be had with ease and rapidity.

The invention consists in the various details of construction and in-the novel manner of combining or arranging thesame all of which will be fully described hereinafter and set forth in the appended claims.

In'the drawings forming a partof this specification Fig. l is a front view of the cabinet showing the carbons of the arc lamp therein; Fig. 2 is a longitudinal vertical sectional view through the cabinet,the light diffusing curtain being-arranged upon the top thereof and stretched acrossthe front=thereof; Fig. Sis a side view of the Cabinet with the same arrangement of light diffusiv cur- 1923. Serial No. 639,079.

tain; Fig. 4 is an inverted bottom plan view; .Eig. 5 is a sideelevation of aslightly modified form of cabinet, the doorsvin the side thereof being shown open and the light diffusingcurtainiarrangedjin a slightly differmodified constructionof theconnecting and adjusting means.

The cabinet or. hood which is made of thin sheet metal and is-open ,atthe front, comprises a top, bottom and sidestogether with a back, the side portions merginginto the back. i

The rear'portion ofthe top is flat as indicated at A and the rearportion of the. bottom is also-flat .as indicated at B, while the forward portionofthe top flares upwardly as indicated at A, andthe forward portion of thebottom flares downwardly as indicated at B; and atits forward end is provided with an upwardlyextending plate 13 which will serve'to catch anyhotsparks from the carbons, and if desired this plate could be placed on the bottom at any intermediate point.

The sides C diverge forwardly for the greater portion of theirlengtlubut at their extreme forward ends are substantiallyparallel as indicated at C, and both the top and bottom are formed with'louvresA andB 'respectively,.for the purpose of ventilation or permitting the heated air to escape.

The backportion of. the cabinet comprises therearwardly curved portions 1), andthe intermediate straight portionD, the sides C .merging into the curved end wall portions D as indicated most clearly. in'Figs. 4 and (land the intermediate portionD provides a convenient point'of attachment forthe suspending devices and also provides ample room for adjustingthe cabinet angular-1y.

The rear walls .D are curved preferably uponthe arcs of circles, the centers of which are the carbons of the arc lamp hereinafter referred to, such rear wall portions being coaxial with the carbons. These curved walls serve to uniformly reflect the rays of light emanating from the arcs. The interior sur face of the cabinet may be polished or coated with any suitable reflecting coating.

If desired, outwardly opening doors E hinged at E may be arranged in the sides of the cabinet adjacent the rear for the purpose of permitting the escape of heat, and also to permit, when desired, a certain amount of light to be projected through the sides of the cabinet at these points, and the light proj ected. through these openings can be reflected directly upon the subject to be photographed.

The top of the cabinet projects forwardly a considerable distance beyond the bottom thereof as most clearly shown and the front edges of the sides are curved as shown at C and over the open front of the cabinet I propose to draw a light modifying or diffusing curtain F, which is preferably of translucent material and mounted upona roller G which is arranged in a bracket frame H pivotally and adjustably connected to upwardly extending lugs I arranged at the forward upper ends of the cabinet; wing nuts I being employed to securely fasten the bar or frame H at any desired point of adjustment.

The light diffusing curtain F is drawn across the front of the cabinet and is fastened at its lower end by suitable cords F connected to buttons or cleats F arranged upon the bottom of the cabinet as most clearly shown in Figs. 2 and 5, and when the curtain is thus arranged the light will be diflused downwardly as from a sun skylight.

Instead, however, of arranging the roll of the light diffusing curtain upon the top of the cabinet, I may arrange the same beneath the bottom thereof in suitable brackets H and draw the curtain upwardly instead of downwardly and it will be understood ofcourse that in adjusting the curtain it can be drawn entirely across the front of the cabinet as most clearly shown in Figs. 2 and 3 or it can be drawn partially across the front of the cabinet as shown in Fig. 7 and if desired, the

I bail H can be thrown to a horizontal position as shown in Fig. 5 and the curtain can be loosely draped or looped, thereby permitting a certain amount of light to emanate from the front of the cabinet in the front side edges and at the same time modifying the direct rays of light by means of the light diffusing or modifying curtain, and the direct rays coming from the sides or the unscreened portions of the front can be reflected or directed in any suitable manner by screens or mirrors to the subject or any particular portion thereof.

It will, therefore, be understood that the bail or bracket H at the top of the curtain can be adjusted to any desired position and that the curtain can be drawn to completely cover or only partially so and also that it can be arranged either loose or tight as preferred.

The carbons for the production of the are light are indicated at K in Figs. 1 and 5 and as previously stated these are arranged coaXially with reference to the curved portions of the rear end of the cabinet and these carbons constitute portions of the arc lamp indicated generally by the reference letter K, said arc lamp being preferably constructed in accordance with my applications above referred to.

One frame member L which constitutes a part of the arc lamp is rigidly connected to the top of the cabinet at the rear end thereof as most clearly shown in Figs. 5 and 6, there being interposed a piece of asbestos or other suitable non-conducting material L between this frame member and the top of the cabinet, and this frame member L is formed with a pair of rearwardly extending hooks L which project rearwardly and engage a bolt or pin M carried by the forwardly projecting bracket fingers N connected to the adjustable upright N which constitutes a part of the support of the cabinet. The frame member is also formed with a clownwardly extending plate L which is located against the part D of the back of cabinet and is slotted Vertically as shown and through the slot works the screw L carrying the wing nut L for the purpose of adjusting the position of the cabinet after be ing hooked upon the bolt M. The bolt L is connected to and projects outwardly from the bracket member N connected to the ad justable standard N.

In Fig. 8 I have shown another mode of.

suspension in which the frame member is formed with a rearwardly projecting plate and upwardly projecting ears 0 which fit between the forwardly projecting members O of thefbracket O and a bolt 0* is passed through the ears 0. and oblique slots 0 are produced in the forwardly projecting members 0 and an adjusting screw 0 works through the connecting portion 0 of the bracket and bears against the rearwardly projecting plate-like portion 0 for the purpose of adjusting the cabinet at any desired angle.

A Wing nut O is screwed upon the end of the bolt 0 and this nut is formed with tapered portion to fit into a counterbored por tion of the slot thereby permitting the nut to be loosened for the purpose of adjusting the angle of the cabinet without permitting the parts to become disconnected; and this same feature of construction is also present in the connection previously described and shown in detail in Fig. 6, there being a wing nut M upon the end of the bolt M, and this nut is provided with a conical portion which...

fits into the counterbored portion of the slot shifted with reference to the vertical standard or support N.

It will also be understood that the standard N is raised and lowered; and by the adjusting means, previously described, the cabinet can be adjusted at the proper angle with reference to the vertical standard or support and properly positioned with reference to the subject.

The upright members P, P which consti-' tute a part of the arc lamp frame, pass through both the top and bottom of the cabinet and are connected beneath the cabinet by a suitable connecting piece P and which also constitutes the carbon holders for the lower carbons.

The rear portion of the cabinet owing to to its shape will effectively reflect the rays of light which are projected rearwardly and the sides will reflect the rays which project laterally and the cabinet as a whole being open at the front and the front thereof being of considerably greater area than the rear end, the rays of light from the arc lamp will be thrown out into a considerable beam and ample for photographic purposes either with still or moving subjects.

Furthermore, by means of the diflusing curtain, I am able to diffuse or modify the light as desired and this modification can be total or partial as desired and can be partial from either the top or the bottom of the cabinet; and whenever required, can be modified from the front and unmodified from the sides and furthermore, when needed, a certain amount of light can be discharged from the sides of the cabinet near the rear end thereof by opening the doors at the side.

By making louvres in the top and bottom near the front, ventilation is provided without interfering with the reflecting qualities of the interior of the cabinet.

It will thus be seen that I provide a simple and highly efficient construction of cabinet for use in connection with are lamps capable of carrying out all of the objects hereinbefore referred to.

Having thus described my invention, what I claim is:

1. An open front cabinet for an arc lamp, the rear wall of said cabinet being curved about an axis coincident with that of the carbons of the arc lamp.

2. A cabinet for an arc lamp having a top, bottom, sides, and rear end, the rear end having one or more curved portions coaxial with the carbon or carbons of the arc lamp,

' parallel rear portions by which the operat the top and bottom having relatively flat ing parts of the arc lamp are supported.

3. A cabinet for an arc lamp having a top,

bottom, rear and sides, the top, bottom and sides forwardly diverging, the top and bottom having flat rear portions, and the rear having one or more curved portions, coaxial with respect to the carbon or carbons arranged in said cabinet.

4. A cabinet for an arc lamp comprising a rear portion housing the carbons of the lamp and having top and bottom Walls and a side wall having portions curved coaxially With respect to the carbons, and a forward light distributing portion formed by forwardly diverging extensions of the top, bottom and side Walls of said rear portion.

5. A cabinet for an arc lamp comprising a rear portion housing the carbons and having flat and parallel top and bottom walls and a side wall having portions curved coaxially with respect to the carbons, and a forward light distributing portion formed by forwardly diverging extensions of the top, bottom and side Walls of said rear portion.

In testimony whereof, I hereunto aflix my signature.

JAMES H. WAGENHORST.

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