US550475A - Photographic-shutter-releasing device - Google Patents

Description

(No Model.)

A. M. BOOS.

PHOTOGRAPHIG SHUTTER RELEAS ING DEVICE. No; 550,475. Patented Nov. 26, 1895.

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- I v ATTORNEYS.

AN BMW 5 GRAHAM. PHOTO UTNDVWASHI NGTOILDC UNITED STATES PATENT OFFICE.

ARTHUR M. BOOS, OF BOSTON, MASSACHUSETTS.

PHOTOGRAPHlC-SHUTTER-RELEASING DEVICE.

SPECIFICATION forming part of Letters Patent No. 550,475, dated November 26, 1895.

Application filed April 6, 1895. Serial No. 544,744. (No model.) I

To all whom it may concern:

Be it known that I, ARTHUR M. Boos, of Boston, (Jamaica Plain,) in the county of Suffolk and State of Massachusetts, have invented a new and Improved Photographic- Shutter-Releasing Device, of which the' following is a full, clear, and exact description.

The invention relates to photographic cameras; and its object is to provide a new and improved shutter-releasing device which is comparatively simple and durable in construction and arranged to automatically release the shutter for time or instantaneous work to enable the photographer to be away from the camera while the exposure is made.

The invention consists principally of a device for pressing the button to release the shutter, the said device being normally held out of contact by a fusestring.

The invention also consists of certain parts and details and combinations of the same, as will be fully described hereinafter and then pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure 1 is a sectional side elevation of the shutter-releasing device on the line 1 1 of Fig. 2 and as applied. Fig. 2 is a plan view of the same. Fig. 3 is a perspective View of the device as arranged for instantaneous exposure. Fig. 4 is a plan view of a fuse-string used for time exposure, and Fig. 5 is a similar View of a fuse-string for instantaneous exposure.

The improved device is provided with a suitably-constructed frame A, secured on a camera B in the immediate neighborhood of the button used for releasing the shutter to make the exposure either instantaneous or time, as the case may be.

On one arm A of the frame A is j ournaled a cam 0, provided with three points 0 O 0 if the device is for time exposure, as shown in Figs. 1 and 2, or only with two points 0 0 as indicated in Fig. 3, when used for instantaneous exposure. The point O, 0 or C is adapted to engage and press the button D of the cameraBfor releasing the shutter in the manner hereinafter more fully described.

As shown in Figs. 1 and 2, the'cam O is engaged at its point C with one end of a cord E, passing once or twice around a pulley F, fastened to the face of the cam C. The other end of the cord E is attached to the frame A and engages near this end a spring G, preferably in the form of a coil-spring attached to the frame A.

On the top face of the cam O is arranged a hook H, either fastened thereon, as shown in Fig. 1, or the point C may be formed as the hook, as indicated in Fig. 3. This hook H or point G is adapted to be engaged by a fusestring I, which for time exposureis made in the form shown in Figs. 1, 2, and 4that is, provided with two loops 1 and I of which the loop I is considerably longer than the loop I, and the rear ends of the said loops are adapted to be hungupon ahook A formed on the outer end of the frame A. The fuse end of the string I extends to one side and is knotted with the loops 1 I in such a manner that when the fuse-string is lighted and burned it first unties or breaks the short loop I and after a certain length of time burns and breaks the second loop 1 Now it will be seen that when the several parts are in the position shown in Fig. 1 and it is desired to makea time exposure the operator after lighting the fuse end of the string I can leave the camera, as the cam O is held by the string I in the position shown in Fig. 1that is, with the point C in front of the button D and ready to press the latter whenever the cam C is revolved. Now when the fuse-string has burned and broken the first loop I the cam O is sufficiently released to make such rotating movement by the action of the spring G, cord E, and pulley F that the point 0 presses the button D to cause the shutter to be opened for time exposure. A further rotation of the cam O is prevented by the second loop I now engaging the inner end of the hook H, so that the shutter remains open during the time the fuse burns from the first loop I to the second loop I to finally break the latter, so that a further action of the string G, cord E, and pulley F causes a second rotation of the cam O to move the point C over the button D to cause the shutter to close. In case of an in stantaneous exposure a single loop I is provided and connected with the hook 0 as indicated in Fig. 3, it being understood that in this case when the loop I is broken by the fuse burning into the loop the cam O is 1'0- tated to move its point O in contact with the button D to press the latter for instantaneous exposure. On the arm A of the frame A is secured a spring J provided with a loop J, engaging the loop I, so as to hold the burning ends thereof in proper position above the camera to prevent'the fuse from falling upon the box, and also to prevent undue reflections of light, which might undesirably influence the picture taken.

A guard K, attached to the frame A, extends over the button D to reduce the shock given by the point C, 0 or 0 when moving in contact with the button. Now it will be seen that by this arrangement the person operating the camera may be at a short distance from the same during the time the exposure is made, to enable the operator, for instance, to form part of a group to be taken by the camera or to take pictures more unobservedly than is now possible.

It is understood that any desired interval of time may be given between the burning of the fuse from the first loop I to the second loop I to regulate the length of time for the exposure. It is also understood that in the case of a time exposure such as shown in Figs. 1 and 2 the button D must be pressed twice to make an exposure-that is, once to open the shutter and the second time for closing it.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patent- 1. A shutter releasing device for cameras, provided with a button pressing device adapted to press the button for releasing the shutter, and a fuse string for normally holding the said button pressing device out of contact with the button, substantially as shown and described.

2. A shutter releasing device for cameras, comprising a cam for pressing the button, means for rotating the said cam, and a fuse string engaging the said cam, to hold the latter normally out of contact with the button, substantially as shown and described.

3. A shutter releasing device for cameras, comprising a cam, a cord and pulley connected with the said cam, a spring pressing on the said cord, and a fuse string provided with a loop attached to a fixed part and connected with the said cam, to hold the latter in a normal position; that is, out of contact with the button, substantially as shown and ton for releasing the shutter, means for rotating said cam, and means for holding said cam against rotative movement, substantially as set forth.

ARTHUR M. BOOS.

Witnesses:

GEORGE. J. FENEIRA, DAVID FLOYD, 2d.

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