US722449A - Photographic shutter. - Google Patents

Description

.No. 722,449. PATENTED MAR. 10, 1903.

L. J. R. HOLST.

PHOT'OGRAPHIG SHUTTER.

APPLIOATIOF.I'ILED JUNE 6, 1901.

big); //E\W gkb UNITED STATES PATENT OFFICE.

LODEWYK J. R. HOLST, OF BROOKLYN, NEW YORK, ASSIGNOR OF TWO- THIRDS TO LOUIS BORSUM, OF PLAINFIEL D, NEW JERSEY.

PHOTOGRAPHIC SHUTTER.

SPECIFICATION forming part of Letters Patent N 0. 722,449, dated March 10, 1 903.-

Application filed June 6, 1901.

To all whom it may concern.-

Be it known that I, LODEWYK J AN RUTGER HoLsT, a subject of the Queen of the Netherlands, (but having declared my intention of becoming a citizen of the United States and having taken out my first naturalization papers,) residing in the borough of Brooklyn, city of New York, State of New York, have invented certain new and useful Improvements in Photographic Shutters, of which the following is a specification.

This invention relates to focal-plane shutters. Its object is to effect adjustment of the slit between the curtain-sections from the exterior of the shutter-frame or camera-box without the use of extra rollers or spindles. To that end I connect both ends of each curtain-section with its roller in such manner that while the shutter may be actuated in the usual way the slit may be adjusted by the rotation of one or'bothrolls.

In the accompanying drawings, Figure 1 is a transverse vertical section through a camerabox, showing a shutter mounted and adapted to be operated in accordance with my invention; Fig. 2, a detail longitudinal section on the line 2 2 of Fig. 1, and Fig. 3 a detail side elevation.

A B are the two curtain-sections, the adjacent free edges of which are stiffened by rods a b in the usual way.

A is the roll of section A; B, the roll of section B. From each end of the stiffening rod or strip 1) a cord or tape 0 passes over the roll A in the same direction in which its curtainsection is wound upon it and passes thence around the roller B in a direction opposite that in which its curtain-section is wound thereon. A suitable seat or annular groove is formed upon the roll A to receive the cord 0, while the part of the roll B around which the cord passes and to which its end is attached is preferably formed as a flanged tapered drum, (marked O.) Similarly each corner of the free end of the curtain-section O has attached to it a cord or tape D, which passes over the roll B, thence to and around a drum D on the roll A. The spindle E of the roll A has at one end a pulley e to receive a belt E, that passes over a similar pulley e on the roll B.

It is obvious that when either Serial No. 63.397. (N0 model.)

roller is rotating in a direction to unroll the curtain from it it would equally roll up the cords or tapes, and thereby keep the curtain taut at all times. When one roller is rotated independently of the other, there will necessarily be a change in the width of the slit or opening between the rods 64 b. This independent motion may be obtained by constructing in the manner presently described or otherwise one of the rollers, preferably the upper one, or that upon which the curtain or shutter is wound in setting it, the lower or other roll being, as usual,"the springroll. The other end of the spindle E extends through the camerabox or shutter-frame, having its bearing in a sleeve F, integral with the roll A, as are also the parts D and the core pieces or plugs ff, in whichthe spindle is also seated. On the projecting end of the sleeve F is a disk G, having in it a series of apertures g, equally distant from the axis of the sleeve, andon the projecting end of the spindle is a knob H and an arm it, having thereon a pin adapted to engage the apertures As shown, the spindle is divided and lap-jointed, as indicated at 00, so as to allow a slight endwise movement of its projecting knobbed end, which is limited by a stop-pin 00 in the movable section of the spindle, the purpose being to permit of the disengagement of the arm h from the diskG, V The same result, however, may be accomplished by making the arm h sufficiently resilient to permit of itsbeing drawn back to disengage the pin thereon from the disk.

The general arrangement andconnection of the curtainsections is important. The mere details of the roller and spindle construction are unimportant.

When the spindle E and disk Gare locked together, both curtain-sections of the shutter will act in unison in the ordinary way; but when disengaged the roll and spindle can be rotated independently, thereby efiecting a variation of the width of the slit or opening between the edges of the curtain-sections. If the spindle when disconnected from the disk G is rotated, the roll B will, by means of the belt E, be rotated and the edge I) of its curtain-section will be advanced or withdrawn from the edge of the curtain-section A.

If the spindle be held stationary and the disk G rotated while disengaged from it, a similar movement of the curtain A will be effected. The construction described permits of the regulation of the width of the slit to any desired extent either before or after the shutter is set for action. The knob E and disk G may be employed to set the shutter by winding it upon the roll A.

The shutter may be tripped in any usual and suitable way. For instance, the usual ratchet or toothed wheel may be placed upon the roll A at either side within the camerabox to cooperate with the ordinary latch that may be tripped in any way. As shown in the drawings, the periphery of the disk G is formed with teeth which are engaged by a latch K, mounted on the-outside of the camera-box. This latch may be tripped by direct application of the hand by a pneumatic bulb or otherwise. The plan that may be adopted for locking the roll A when the curtain is wound upon it and the manner of releasing it to permit the actuation of the shutter are quite immaterial, and the devices may be arranged within or without the camera-box, as may be desired.

I claim as my invention 1. A photographic focal-plane shutter comprising two curtains, the rolls to which they are connected, separate connections between both ends of each curtain and its roll, which connections are wound in a reverse direction around the roll of the curtain to which it is attached, and means for actuating a roll to Vary the slit between the two curtain-sections.

2. A photographic focal-plane shutter comprising two curtain-sections, their respective rolls, separate flexible connections between the free ends of each curtain-section and its roll, which connections pass in a reverse direction around the roll of the curtain to which it is attached and which also pass around the other roll, and means for actuating a roll to adjust the slit between the two curtain-sections.

3. A photographic focal-plane shutter comprising two curtain-sections, their respective rolls, flexible connections between the free ends of each curtain-section and its rolls, which connections are wound in reverse direction around the roll of the curtain t which they are attached, and which also pass around the other roll, and means for revolving one roll independently of the other to adjust the slit between the two curtain-sections.

4. A photographic focal-plane shutter,comprising two curtain-sections, their respective rolls, a belt connection between them to insure their normal conjoint rotation, flexible connections between either end of each curtain-section and its roll, which connections are wound in reverse direction to the roll of the curtain to which they are attached, and which pass around the other roll, and means for actuating a roll to adjust the slit between the curtain-sections.

5. A photographic focal-plane shutter comprising two curtain-sections, their respective rolls, means for disconnecting one roll from its spindle to permit of rotation of either roll or spindle, a driving connection between said spindle and the other roll, and flexible connections between the free ends of each curtain-section and its roll, which connections are wound in a reverse direction about the roll of the curtain to which it is attached, and which are also wound around the other roll.

In testimony whereof I have hereunto subscribed my name.

L. J. R. I-IOLST.

Witnesses:

KATHARINE MAOMAHON, EDWARD C. DAVIDSON.

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