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Publication numberUS1740463 A
Publication typeGrant
Publication dateDec 24, 1929
Filing dateJan 16, 1928
Priority dateJan 16, 1928
Publication numberUS 1740463 A, US 1740463A, US-A-1740463, US1740463 A, US1740463A
InventorsHerbert A Kliegl
Original AssigneeKliegl Bros Universal Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US 1740463 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

Dec. 24, 1929.

SPOTLIGHT Fil an- 16. 1928 2 Sheets-Shee 1 H. A. KLIEGL' 1,740,463

Dec. 24, 1929.

H. A. KLIEGL 1,740,463

S-ZLOTLIGHT Filed fan. 1 1928 2 Sheets-Shee 2 I l i '1' avwewtoc HERBERT A. HLIEGL $513 Gum/W W. M W


This invention pertains to spot lights of the type used in theatres, and is an improvement on the invention disclosed in Patent 1,679,361, issued August 7, 1928, to John H. Kliegl.

In the use of such spot lights it is customary to place transparent screens of various colors before the spot light in order to produce desired color effects on the stage.

The above application discloses electromagnetic mechanism for controlling the color screens to permit their manipulation by an operator at a point removed from the light itself.

The particular object of the present invention is to provlde an improved arrangement of such apparatus, so designed that the electromagnetic control devices may be gathered together as a unit suitable for easy attachment to spot lights of regular type, thereby great- 1y simplifying manufacturing operations and reducing cost of manufacture.

Further and other objects and advantages will be hereinafter set forth in the accompanying specification and claim, and shown in the drawings, which by way of illustration show what is now considered to be the preferred embodiment of the invention.

Fig. 1 is a side view of a typical spot light with my invention in place thereon. The front of the light is at the left.

Fig. 2 is a front view of the light, on the line 22 of Fig. 1.

Fig. 3 is a view, partly in section, on the line 33 of Fig. 1.

Fig. 4 is a view of the electromagnetic assembly, on the line 4-4 of Fig. 1.

Fig. 5 is a wiring diagram.

The spot light casing is designated 10, and it is locked in position by clamp 12 on supporting standard 14.

Secured by screws 16 to the side of casing 10 is a box-like structure 18, within and upon which is assembled the entire electromagnetic control mechanism.

In the present embodiment of the invention four color screens 20 are shown, each mounted in a ring-like frame 22. Each frame 22 is provided with an arm 24 fast to one of four concentric shafts supported for rotation in brackets 26 at the top of frame 18 Serial No. 246,932.

and integral therewith. The shafts are hollow except the center one. From the center outwardly the shafts are designated 30, 32, 34 and 36 (Figs. 1 and 4). By rotation of any shaft the screen frame 22 fast to that particular shaft may be moved from its normal position on stop 38 (Fig. 2) to the dotted line position on stop 40, or vice versa. Stops 38 and 40 are preferably of resilient material, and are mounted on rods 42 and 44 projecting forwardly from frame 18.

Each arm 24 is extended below the shaft to which it is attached, to form a finger 46, to which is connected one end of a helical spring 48 (Fig. 2), the other end of the spring being connected to a rod which projects forwardly from frame 18 below, and parallel to, rods 42 and 44. Whenever a screen is in its inoperative position at the right (Fig. 2), its spring 48 is in the full line position.

Rod 50 and finger 46 are so located relatively to each other that, when the screen is at the right, in contact with stop 38, spring 48 is operating with a slight leverage 47 to urge the screen toward the left about its supporting shaft 30, 32, 34 or 36. This leverage is so adjusted as to enable spring 48 to hold the screen in substantially the normal position shown at the right in Fig. 2, even though stop 38 be removed. lVhen the screen is moved to that position stop 38 serves the useful purpose of bringing the screen to rest without the oscillation which would take place if a stop or equiv alent device were not provided. Particular utility of this arrangement will be pointed out later in the specification.

lVhen the screen is to be moved to its operative position at the left, the spring and finger 46 assume the dotted line positions, in which position the spring is under sufficient tension to return the screen from operative to nonoperative position whenever the screen is no longer forcibly held in operative position, as will be more fully explained.

Arranged in a row within frame 18 and directly underneath the nest of shafts 30, 32, 34 and 36. are four solenoids 52, each fastened to the floor of frame 18 by a screw 54. Each solenoid is provided with a vertically movable plunger 56, the upper end of which is operably connected by a link 58 to a crank arm 60, each crank arm being fast to one of the shafts 30, 32, 34 or 36 as shown in Figs. 1, 3 and 4. Reference to Fig. 3 will show that if a plunger 56 be drawn down by energization of solenoid 52, crank 60, and the shaft to which the crank is attached, will be rotated counterclockwise and the particular screen attached to the other end of that shaft will be moved to its operative position at the left, againststop 40.

Due to the fact that, as previously ex plained, the screen while in normal position is held in equilibrium by spring 48, the sole-.

noid is enabled to start'the screen in motion from normal position with very slight effort, therebv permitting a great saving in the amount of current required for the operation of the device, as compared to the amount necessary if the weight of the screen were not balanced by the tension of spring 48.

When a solenoid is energized to move a screen to its operative position at the left, as the screen approaches operative position the the result that the screen assumes its operative position Very gently and is then retained in position by the solenoid, against the resistance of the spring. until the solenoid is deenergized.

The circuit diagram is shown in Fig. 5, in which 7 O. is the source of current, 72is a common wire leading to all solenoids 52, 74 is a common wire leading to all switches 7 6. lVhen the operator depresses any switch key 7 8 a circuit is closed through a solenoid 52 and the screen controlled by that solenoid is moved to operative position. lVhen key 78 is released the screen is drawn back to normal position by spring 48, which was placed under tension, as above described, when thescreen was moved to the left (Fig. 2). It will be evident that one or more screens may be in operative position at the same time, at the will of the operator, depending on how many keys 78 he holds down simultaneously.

Plates 80 serve as spacers between the screens and also add stiffness to the screensupporting portion of the structure.

It will be noted: that the complete electromagnetic mechanism is supported by the boxlike frame .18 to. form a unit, and that therefore a hand-operated spot light may be converted into anclectrically controlled machine '1 almost instantly by simply inserting the screws 16. v r y It is to be understood that the i-nvention is not limited to the construction herein specifi cally illustrated but can be embodied in other forms without departure from its spirit as defined, by the appended claim.

I claim a A color control apparatus for a spot light, comprising in combination, a frame, a plurality of color screens movably mounted on,

and shafts being arranged to form a unitary structure suitable for attachment to a spot light for the purpose set forth.

In testimony whereof I hereto affix my signature.


tension of the spring gradually increases with

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2726117 *Oct 20, 1951Dec 6, 1955John E BarberColored fountains with pattern control
US4298920 *Jun 7, 1979Nov 3, 1981Lewis GluckAutomatic gel changer for a spotlight
US4600976 *Feb 25, 1985Jul 15, 1986Michael CallahanColor changer mechanism
WO1998017945A1 *Oct 17, 1997Apr 30, 1998Light & Sound DesignCammed rotating gobos
U.S. Classification362/323, 362/324
International ClassificationF21S8/00
Cooperative ClassificationF21W2131/406