US2439330A

US2439330A - Signal and searchlight shutter

Info

Publication number: US2439330A
Application number: US758344A
Authority: US
Inventors: Otto J Zander
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-07-01
Filing date: 1947-07-01
Publication date: 1948-04-06
Anticipated expiration: 1965-04-06

Description

earCH nuulu 7' 2A 6) 2 Sheetsj-Sheet 1 f Filed July 1, 1947 Search Room Ap 6, 1948. o. J. zANDr-:R

SIGNAL AND SEARCHLIGHT SHUTTER Filed July l, 1947 2 Sheets-Sheet 2 INVENTOR 077-0 m A-'rroRNEY Patented Apr. 6, 1948 Search Room SIGNAL AND SEARCHLIGHT SHUTTER Otto J. Zander, Huguenot, N. Y.

substituted for abandoned application Serial No. 490,287, June 10, 1943. This application July 1, 1947, Serial No. 758,344

The present |invention relates to a signal and searchlight shutter construction and more partcularly to searchlights of relatively large size. This application is a substitute of my prior abandoned application Ser. No. 490,287, filed June l0, 1943.

An object of the invention is to so arrange the shutter that there will be no obstruction to the light beams by the operating mechanism of the shutter itself. In searchllght signalling shutters with which I am aware, it has been customary to use Ia shutter generally known as the Venetian blind type. In such a shutter, however, there is considerable obscuration of light due to the fact that the shutters, even though in open position, interfere somewhat with the light beams and the operating mechanism also contributes to this end.

The .present invention provides a shutter which may be completely closed, or opened to any desired extent, and in which nothing in connection with the shutter operating means interferes in any way with the light beams.

Shutters such as are used in cameras and known generally as iris diaphragm shutters are not suitable for signalling be`cause-a-shutter of this type'ncannot "be" 'closed' compitely'."\

According `t6"t`e`preet`inventiom the vanes or blades composing the shutter each move in its own plane towards the center of the aperture to be closed. The first vane overlaps the one next adjacent. The second overlaps the third and moves in a plane between the planes of movement of the first and third vane. The last vane of the series, however, moves in a plane outside the plane of movement of all the rest. That is to say, the last vane overlaps the vanes adjacent thereto and does not pass und/er any.

In the drawings which show one embodiment of the invention:

Fig. 1 is a side elevation showing a searchl'ight in which the invention may be embodied;

Fig. 2 is a section on line 2-2, Fig. 3, and on a much larger scale than Fig. 1; y

Fig. 3 is a section on line 3--3 of Fig. 2;

Fig. 4 is a section on line 4 4-, Fig. 3; and

Fig. 5 is a view similar to Fig. 4 but showing the vane in open position.

Referring to the drawings, the searchlight itself may be of any known construction and includes an apertured casing I having an aperturred front plate 2 and a glass plate 3 (Fig. 3). Just back of the plate 2 is an apertured plate 4 and spaced from this plate is a similar plate 5.

4 Claims. (Cl. 177-329) The

plates

4 and 5 support the vanes of which 55 2 16 are shown in the present embodiment of the invention.

The vanes are arranged in a circular series and the first three vanes are numbered 1, 2 and 3; the last three are numbered 14, 15 and 16. In order that the numbers applied to the vanes may not be confused with reference characters applied to other parts, the vane numbers are italicized. Each of the vanes 1 to 15 is pivotally supported in the plate 5. The pivots 6 which support vanes 2 to 15 are each rigidly connected with each vane as by welding or by other suitable means, and pivotally supported in plate 5. The pivot Ba for vane 1 is fixed in plate 5.

As shown in Figs. 2 and 3, the vane 1 is nearest the plate 5 and may oscillate on its fixed pivot 6a from the position shown in Fig. 5 to the position shown in Fig. 4 in which latter position all of the vanes have been moved to the center of the aperture in the casing, thereby completely closing said aperture.

All o-f the vanes move in their own planes as they are swung from open to closed position and vice versa.

Vane No. 2 swings in the plane between the planes of movement of

vanes

1 and 3. Also, vane 15 moves in a plane between

vanes

14 and 16.

Vane 16 is pivoted to plate 4 as clearly shown in Fig. 3 and moves in a plane outside of all of the other vanes and overlaps vane 15 and vane 1. The pivot for vane 16 is indicated by the reference character 8. It should be noted that pivots 6a, E and 8 are arranged in a circle at regular intervals.

All of the vanes are swung about their pivots by means of a ring I0 shown in section in Fig. 3 and in dotted lines in Fig. 1. This ring is`between

plates

4 and 5 and is mounted for oscillating movement within the casing I. Pins I2 connect each vane to the ring I0, the ring being slotted at points I4 to receive the pins I2 and permit inward and outward movement in the slots due to the different radii of curvature. The pins I2 decrease in length from vane 1 to vane 16.

The ring Ill is also slotted at Il, Fig. 2, and a pin I8 secured in plate 4 engages in the slot I'l to limit the movement of the ring I0.

The ring I0 may be moved in any suitable manner and as herein disclosed is provided with a number of peripheral teeth 20, Fig. 2, engaged by a toothed sector 22 secured to a shaft 23.

A spring 24 has one end thereof secured to a housing 25 and normally tends to rotate the sector 22 in a clockwise direction thereby tending to move the ring I0 to the position shown in Fig. 2

whereby all of the vanes are in closed position. The shaft 2i may be rotated in an anti-clockwise direction against the action of the spring 24 to move the vanes to open position which position is shown in Fig, 5. In Fig. 1, a flexible shaft 2B is shown and such shaft is suitably connected to the shaft 23. Any other suitable means of course may be provided for moving the shaft 23.

Since the pivots 6 for al1 of the vanes 2 to 15 are pivotally connected to the plate 5, and vary in length in accordance with the distances of the corresponding vanes from plate 5, the pivots 6 do not interfere with the free movement of the vanes from closed to open position.

In the case of the pivot 8 for the vane 16, however, since this pivot is secured in the plate 4, there is also no interference by this pivot with any of the vanes. The pivot 6, however, for the vane 15 would interfere with the free movement of the vane 1 unless provision were made to prevent such interference. Therefore, the vane 1 is provided with a small recess 30 which permits the full movement of the Vane 1 without interference by the pivot 6 of the vane 15.

With the constnuction above described it is apparent that the vanes when occupying the position shown in Fig. 2, completely close the aper. ture and when moved to the position shown in Fig. give an unobstructed passage for the light which is situated in the back of the casing. The shuttentherefore, consisting of a series of vanes as herein disclosed is entirely free from any parts that would interfere with the free passage of the light beams when the vanes are swung towards open position.

Variations may be resorted to within the scope of the invention without departing from the spirit thereof.

What is claimed is:

1. A signal and searchlight shutter comprising a casing having parallel front and rear plates with aligned circular apertures, a plurality of fiat vanes pivotally mounted at points spaced at regular intervals around said casing and close to the edges of said circular apertures, the rearmost vane being pivoted on said rear plate, the foremost vane being pivoted on the front plate, pivot pins mounted at their rear ends to turn in the rear plate and gradually increasing in length from the second to the next to last by increments corresponding to the thickness of a vane, all of such vanes being fixed on the forward ends of said pins and each overlapping the vane to the rear, the vane pivoted on the front plate overlying the front vane on a pin, and means for actuating said vanes to closed and open positions.

2. A signal and searchlight shutter comprising a casing having parallel front and rear plates with aligned circular apertures, a plurality of flat vanes pivotally mounted at points spaced at regular intervals around said casing and adjacent the edges of said circular apertures, the rearmost vane being pivoted on said rear plate, the foremostyane being pivoted on the front plate, the pivotal mountings of said vanes between the rst and the last including members projecting from the plate and increasing in length for successive vanes to hold such vanes at the proper positions from rear to front with respect to each other, and means for actuating the vanes to closed and open positions.

3. A signal and searchlight shutter comprising a casing having parallel front and rear plates with aligned circular apertures, a plurality of fiat vanes pivotally mounted at points spaced at regular intervals around said casing and adjacent the edges of said circular apertures, the rearmost vane being pivoted on said rear plate, the foremost vane being pivoted on the front plate, the pivotal mountings of said vanes between the first and the last including members projecting from the rear plate and increasing in length for successive vanes to hold such vanes at the proper positions from rear to front with respect to each other, and means for actuating the vanes to closed and open positions including a ring at the rear of the front plate provided with radial slots arranged at regular intervals and of the same number as said vanes, and pins of different but suitable lengths projecting from the outer ends of said vanes into said radial slots.

4. A signal and searchlight shutter comprising a casing having parallel front and rear plates with aligned circular apertures, a plurality of nat vanes pivotally mounted at points spaced at regular intervals around said casing and adjacent the edges of said circular apertures, the rearmost vane being pivoted on said rear plate, the foremost vane being pivoted on the front plate, the pivotal mountings of said vanes between the first and the last including members projecting from the rear plate and increasing in length for successive vanes to hold such vanes at the proper positions from rear to front with respect to each other, and means for actuating the vanes to closed and open positions including a ring in a plane parallel to those of the front and rear plates and having slots corresponding in position to said vanes and pins projecting from the outer ends of said vanes into said slots.

OTTO J. ZANDER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 444,083 Bausch et al Jan. 6, 1891 798,595 Brueck Sept. 5, 1905 1,037,402 Zehendner Sept. 3, 1912 1,678,179 Brueck July 24, 1928 1,750,830 Wollensak Mal'. 18, 1930 2,168,893 Aiken Aug. 8, 1939