US2668904A - Electric lighting fixture - Google Patents

Description

Feb. 9, 1954 s. M CANDLE SS ELECTRIC LIGHTING FIXTURE 2 Sheets-Sheet 1 Filed Jan. 19, 1949 w J a 5 moo on 3 @m INVENTOR.

mm E q. r. m N G v31% 3 g m 8 M M a T Feb. 9, 1954 s. MCCANDLESS ELECTRIC LIGHTING FIXTURE 2 Sheets-Sheet 2 Filed Jan. 19, 1949 IN V EN TOR.

A TTOQNE'Y Patented Feb. 9, 1954 ELECTRIC LIGHTING FIXTURE Stanley McCandless, Hamden, Cnn., assignor to Century Lighting, Inc., New York, N. Y., a corporation of New York Application January 19, 1949, Serial No. 71,618

2 Claims. (01. 240-52) This invention relates to electric lighting fixtures. More particularly, my invention pertains to electric lighting fixtures oi the type used in theatrical, architectural and commercial lighting.

It is an object of my invention to provide an electric lighting fixture of the character described which is constructed to facilitate onehanded relamping, so that the fixture is particularly useful in locations which are accessible only with the aid of very tall ladders.

It is another object of my invention to provide an electric lighting fixture in which a simplified mechanism is employed to move jointly a burner and a louver with respect to a reflector.

It is a further object of my invention to provide an electric lighting fixture of the character described which is rotatable with respect to a support and in which an improved mechanism is included to lock the fixture in any adjusted angular position thereof.

. It is an additional object of my invention to provide an electric lighting fixture of the character described which has a rugged compact construction and can be manufactured economically.

Other objects of my invention will in part be obvious and in part will be pointed out hereinafter.

My invention accordingly consists in the features of construction, combinations of elements and arrangements of parts which will be exemplified in the construction hereinafter described and of which the scope of application will be indicated in the appended claims.

In the accompanying drawings in which is shown one of the various possible embodiments of my invention,

Fig. 1 is a front View of an electric lighting fixture constructed in accordance with my invention;

Fig. 2 is a sectional view through said fixture taken substantially along the line 2 -2 of Fig. 1;

Fig. 3 is a sectional view taken substantially. along the line 3,3 of Fig, 2, and is explanatory of the construction of the burner, the burner iocuss ng adjustment, the pivotal mounting for the louver, and the spring detent for the louver;

Fig. i is a sectional view taken substantially along the line li of Fig. 2, and is explanatory of the construction of the rotary mounting for the housing. the pivotal mounting for the louver, and the fairing for the burner focussing knob;

Fig. 5 is a sectional view taken substantially along the line 5-4; of Fig. 2, and is explanatory of the construction of the burner focus-sing mechanism;

Fig. 6 is a sectional view taken substantially along the line 6-6 of Fig. 2, and is expl ato y of the construction of the forward bearing for the burner focussing spindle;

Fig. '7 is a side View of the fixture;

Fig. 8 is an enlarged sectional view taken substantially along the line 88 of Fig. 7, and is explanatory of the construction of the lock for the rotary housing mounting; and

Fig. 9 is a sectional view taken substantially along the line 9-4) of Fig. 8.

Referring now in detail to the drawings, the reference numeral Ill denotes an electric lighting fixture embodying my invention and comprising a housing l2 of a standard appearance. Said housing includes a tubular section [4 having an open forward end and whose rear end is closed by a dome-shaped wall l6 which substantially conforms in contour to the configuration of a specular paraboliod reflector l8 located within the housing and supported from said rear wall. The housing contains a concentrated filament lamp 20. Lamps of this type conventionally are provided either with a spherical envelope as indicated by the full lines in Fig, 2, or with a vertically elongated tubular envelope such as indicated by the dot-and-dash lines in the same figure.

The base of the lamp is received in a socket 22 which is mounted on a support 24, known to the trade as a burner. Said burner is illustrated herein as constituting a casting comprising several parts. One such part is the socket supporting platform 26. This platform is separated by a step 28 from a narrower platform 38 which acts as a louver support and is disposed at somewhat lower level than the socket platform.

A broad leg 32 depends from beneath the socket platform and a narrower leg 34 parallel thereto depends from beneath the louver platform 30. These two legs are provided with apertures 36, 38 registered along a line parallel to the axis of symmetry of the hous ng. One of the apertures, for example, the rear aperture is tapped and the other aperture is unthreaded. Said apertures receive a spindle 40 including a threaded portion 32 designed to be screwed into the tapped aperture 36. Thus, when the spindle is rotated, the burner will be shifted parallel to the axis of the spindle, provided that the spindle is held aga nst axial movement.

To fix the axial position of the spindle, I provide an erect plate 44 (Figs. 2 and 6) having a vertically extending slot 46 which .rotatably retered openings in the strap H4 and a pivot casting H8 fastened to the interior of the housing, as by rivets. A nut I20 screwed on the tip of the bolt holds the same in place. Optionally the pivot casting may have a central boss extending through an aperture in the housing to simplify the housing mount and in general to improve the appearance of the housing.

The other strap I i2 is rotatably secured to the housing in a different manner. Said strap formed with a non-circular opening i22 into which there is fitted a sleeve I24 of non-circular cross-section negatively matching the crosssection of the opening I22. By way of illustra tion, the cross-sectional configuration of the sleeve is square, as indicated in Fig. 9. Desirably, the corners of the square are rounded. to arcs concentric with the longitudinal axis of the sleeve. The sleeve is rotatably fitted in a horizontal bore I26 formed in a pivot clamping casting I23 which is securely affixed to the housing, e. g.. by rivets, at a point diametrically opposed to the pivot casting II8. Like said pivot casting H8, the pivot clamp casting I28 is fashioned with an outwardly extending central boss which protrudes through an opening in the housing and against which the strap II2 rests.

A locking disc I30 rests against the inner surface of the pivot clamp casting, the disc being disposed concentrically about the sleeve I24. Said disc is centrally apertured to a shape negatively matching the configuration of the noncircular sleeve and the sleeve extends through this aperture whereby the disc cannot turn relative to the supporting arm H2. The arm H2, square sleeve I24 and disc I30 are secured to one another by a bolt I32 whose head rests against the outer surface of the strap I12 and whose shank passes through the sleeve, a nut I34 being screwed on the tip of the bolt. By virtue of this arrangement, when the housing is rotated rela tive to the straps H2, H4, the pivot clamp casting I will turn angularly with respect to the locking disc I about the axis of the square sleeve I 24.

Said pivot clamp casting includes a radial extension I36 which projects beyond the periphery of the locking disc. This extension is fashioned with a through aperture I38 in horizontal register with a matching aperture I40 in the side wall of the housing. Said apertures receive a spindle I40 on whose head a knob I42 is fastened. The spindle is threaded to engage a tapped bore in a locking dog I42 having a portion overlying the peripheral zone of the locking disc I30. Upon tightening the locking dog against the disc the pivot clamp casting I28 will be frictionally locked to said disc in any adjusted angular position of the housing I2 relative to the arms II2. By using a construction such as just described, the locking mechanism, except for its manually manipulative member, is entirely concealed within the housing where it does not detract from the appearance of the fixture, is kept free of dirt and cannot pinch an operators finger during locking or unlocking or during changing of the angular position of the housing.

All parts located within the housing, except the reflector and lamp preferably are painted dead black.

It thus will be seen that I have provided an electric lighting fixture which achieves ah the objects of my invention and is well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiment above set forth, it is to be understood that all matter herein described, or shown in the accompanying drawings, is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention. I claim as new and desire to secure by Letters Patent:

1. An electric lighting fixture comprising a housing, a pair of arms disposed on diametrically opposite sides of said housing at a, horizontal level, separate means to rotatably connect each of said arms to said housing for turning about aligned horizontal axes, a locking disc within the housing, means to fix one of said arms to said locking disc, a locking dog within and carried by the housing adjacent said locking disc, a knob carried by and disposed externally of the housing, and means connecting said knob and dog for clamping said dog against said disc upon manipulation of said knob.

2. An electric lighting fixture comprising a housing, a pair of arms disposed on diametrically opposite sides of said housing at a horizontal level, means to rotatably connect one of said arms to said housing for turning about a horizontal axis, means to rotatably connect the other arm to said housing for turning about a horizontal axis in alignment With the first horizontal axis, said last-named means comprising a non-circular opening in the arm, a non-circular element in said opening and a circular opening in the housing, said non-circular element extending through said circular opening in a rotatable fit, a locking disc having a non-circular opening negatively matching and receiving the non-circular element, means to secure together said locking disc, said non-circular element and said arm, a locking dog within and carried by the housing adjacent said locking disc, a knob carried by and disposed externally of the housing, and means connecting said knob and. dog for clamping said dog against said disc upon manipulation of said knob.

STANLEY MCCANDLESS.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 1,383,702 Ellsworth et a1 July 5, 1921 1,786,515 Brownell Dec. 30, 1930 1,896,090 Kuhns Feb. 7, 1933 1,915,967 Bailey June 27, 1933 2,057,278 Richardson Oct. 13, 1936 2,071,159 Benjamin Feb. 16, 1937 2,083,506 Rose June 8, 1937 2,109,056 Bardwell et a1 Feb. 22, 1938 2,152,197 Levy Mar. 28, 1939 2,166,394 Crossley July 18, 1939 2,226,252 Mielziner et al Dec. 24, 1940 2,241,059 Foulds May 6, 1941

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