US2727980A

US2727980A - Light reflector and baffle assembly

Info

Publication number: US2727980A
Application number: US328226A
Authority: US
Inventors: Edward R Farber; Richard R Rauch
Original assignee: STROBO RES
Current assignee: STROBO RES; STROBO-RESEARCH
Priority date: 1952-12-27
Filing date: 1952-12-27
Publication date: 1955-12-20
Anticipated expiration: 1972-12-20

Description

Dec. 20, 1955 E. R. FARBER ETAL LIGHT REFLECTOR AND BAFF'LE ASSEMBLY JNVENTORS EDW/QED 1Q. F eae'e BY Z/CHHEO E. EHUCH MA, MA

A TTOEA/E Y5 Filed Dec. 27, 1952 United States PatentO LIGHT REFLECTOR AND BAFFLE ASSEMBLY Edward R. Farber and Richard R. Ranch, Milwaukee, Wis., assignors to Strobo-Research, Milwaukee, Wis, a corporation of Wisconsin Application December 27, 1952, Serial No. 328,226

4 Claims. (Cl. 2240-13) This invention relates to a light reflector and baffle assembly.

The light is usable generally but is particularly designed for photographic use. An object is to provide a baffle arrangement whereby the projected beam of light can be controlled in such a manner as to restrict the illumination of areas that would otherwise be within the field of the beam. A stand of any desired sort supports a fixture which carries a lamp. The usual concave reflector shell surrounds the lamp. One or more internal or external baflle segments which are shaped to conform to the contour of the shell may be pivoted at or near the rim of the shell, the arrangement being such that either the reflector shell bodily or the supports for the baflle segments may be rotated about the axis of the reflector to vary the angular position of the segments so that light may be cut off from any desired portion of the periphery of the beam.

In the drawings:

Fig. 1 is a view in perspective of a mounted reflector shell and baffle arrangement embodying the invention.

Fig. 2 is a view partially in side elevation and partially in axial section showing in relatively separated positions a fixture and reflector shell made in accordance with the present invention, the reflector shell having a battle mounted as above described.

Fig. 3 is a view taken through the reflector in a section at right angles to that in which Fig. 2 is taken.

Fig. 4 is a view in front elevation showing the bafldcs adjusted around the axis of the reflector to a position about 45 removed from that in which they appear in the other views.

Fig. 5 is a large fragmentary detailed view in transverse section through the connection between the baflle support and the reflector bead.

Fig. 6 is a view in front elevation of the parts shown in Fig. 5.

The fixture 7, which may be of any desired construction is mounted on a stand 8. It frequently has more than one light source including bulbs 9 and 11, but the arrangement of the lamps is immaterial. The lens 12 is held by a retaining ring 13 upon an annulus 14 which fits onto the end of fixture 7 in the assembled position of the parts.

A large concave reflector 15 encircles the light source and is ordinarily concentric with the optical axis upon which beams of light are projected from the bulbs 9 or 11. The reflector 15 may be parabolic or spherical. In either case it is desirably annular, being provided about its inner rear margin with a flange 16 formed forwardly to be engaged between the retaining ring 13 and the annulus 14. Ordinarily the reflector flange is clamped between these parts, but it may be made to rotate between them, whereby the entire reflector is rotatable about its own axis.

In the preferred arrangement of the parts, the reflector is fixed to the fixture 7 and support 8 and is provided near its outer perimeter with a bead 18 having an inwardly and reversely turned free edge at 19, as shown in detail in Fig. 5. At diametrically opposite points are clips 20, each of which comprises a slide having a hooked rear margin 21 engaged over the free edge of the reversely turned flange 19 of bead 18. Each slide carries a pivot stud 22. Upon these studs are pivotally mounted the

segmental bames

23, 24 for pivotal movement in and out of reflector shell 15 upon the diametrical axis common to studs 22. Nuts 25, threaded upon the respective studs 22 maintain the parts in assembly. A washer 26 may be interposed between the baflies and another washer at 27 may be interposed between the innermost baflie and the adjacent nut in the manner shown in Figs. 5 and 6. Consequently, the respective baifles may be freely pivoted to any desired position with respect to the reflector. If the baflles are internal, as in the optional arrangement shown, and are wholly retracted into the reflector, their inner surfaces function as a part of the reflector and none of the light is intercepted. To the extent that either baflle is withdrawn from a nested position respecting the reflector by oscillating it outwardly upon its pivot studs 22, such baflle will intercept a greater or lesser portion of the light at one side of the optical axis.

The baflles are not only pivoted with respect to the slides 20 but also provide mechanical support which holds such slides in position upon the reflector rim. In other words, the fact that the baflles are interposed between the slides prevents the slides from escaping from their interlocked engagement with the reflector rim flange 19.

It will be apparent that the operator can readily rotate the entire baffle assembly, including the two baflies and the clips or slides 20 around the optical axis of the reflector to position the baflies to cut ofl light from any desired side or sides of the beam issuing from the reflector. As above indicated, this is preferably done by letting the slides rotate around the reflector bead, but the invention is not limited to this feature, since the reflector as a whole may also be rotated around the stand-supported fixture. It is preferred that the reflector be fixed because the reflector is larger than the baflies, and a sturdy construction is more easily possible, with less expense, when the reflector is fixed and the slides are movable with respect to the reflector, as Well as the fixture.

I claim:

1. A light comprising the combination with a reflector having an annular bead and reversely turned flange, of clips slidable circumferentially about said head and flange, and having portions in interlocked engagement with the bead and flange, said clips being disposed diametrically opposite each other across the reflector and having substantially diametrical studs, together with a pair of segmental baflles pivoted upon said studs for movement on an axis substantially through said reflector bead to and from positions for intercepting portions of the beam issuing from said reflector, the assembly of said baflies and clips being bodily rotatable about the reflector bead to position said baflies at selected points about the axis of said reflector.

2. The combination with a light source fixture and a concave reflector having an optical axis and an arcuate rim, of at least one segmental baflie having a contour complementary to the reflector whereby to be adapted to be nested With respect to the reflector, said rim being provided with pivotal mountings for said baflie on which the baflle is pivoted on an axis through said rim, said pivotal mountings comprising means slidable circumferentially upon the reflector rim whereby said baflie may be rotated about the optical axis of the reflector independently of the reflector.

3. The device of claim 2 in which the reflector rim is provided with a rearwardly turned flange, said mountings comprising clips having portions engaged with said flange and having diametrical studs upon which said bafile is pivoted.

7 '4. The device of claim 2 in which the reflector and the fixture have complementary -bearing parts in rotatable connection, whereby'the reflector rotates with said baffie respecting the, fi tur 7 References Cited -in the file of this patent V UNITED STATES PATENTS Vass *Dec. 19, 1 916 Higert Jan. 17, 1922 Elsey Dec. 5, 1922 Ki1foy1e' Feb. '13, "1923 Yingling June 23, 1925 Bergenson Oct. 17, 1933 Wuelker July 6, 1937 FOREIGN PATENTS France Dec. 17, 1913 Great Britain Nov. 10, 1927