US367986A

US367986A - lewis

Info

Publication number: US367986A
Authority: US
Publication date: 1887-08-09
Anticipated expiration: 1904-08-09

Description

(NO Model.)

W. H. LEWIS.

PHOTOGRAPH CAMERA SHUTTER.

No. 367,986. Patented Aug. 9'. 1887.

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UNITED STATES PATENT OEEIeE.

\VILLIAM H. LE\VIS, OF BROOKLYN, ASSIGNOR TO E. & H. T. ANTHONY 8n COMPANY, OF NEXV YORK, N. Y.

PHOTOGRAPH-CAMERA SHUTTER.

SPECIFICATION forming part of Letters Patent No. 367,986, dated August 9, 1887.

Application filed April 30, 1886. Serial No. 200,!76]. (No model.) i

To aZZ 071/0772, it may concern.-

Be it known that I, WILLIAM H. LEwIs, of Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in Photographic-Camera Shut ters, of which the following is a specification, reference being bad to the annexed drawings, forming a part thereof, in which- Figure 1 is a front elevation of my improved camera-shutter. Fig. 2 is a side elevation. Fig. 3 is a perspective view showing the rear of the camera-shutter. Fig. 4 is a detail perspective view of the shutter.

Similar letters of reference indicate corresponding parts in the different figures of the drawings.

The object of my invention is to provide a simple, inexpensive, and e'fficient camera-shut ter which may be readily applied to any photographic camera, and which may be used for making either a time or instantaneous exposure.

My invention consists in a circular shutterbody provided with an aperture at one side of the center thereof, and having a fastening device for attaching it to the camera-tube, a circular shutter pivoted to the shutter-body and apertured at one side of the center, having notches in its edge, a lever pivoted to the shutter-body and arranged to engage one or the other of the notches of the shutter, and a pneumatic device for moving the shutter-engaging lever.

It also consists in the combination,with the shutter, of a lever carrying an adjustable weight and connected by a cord with the boss of the shutter.

It also further consists in amovable stop for limiting the motion of the shuttercngaging lever when it is desired to make a time exposure.

The body A of the shutter is provided with a circular opening, B, at one side of the center thereof, and with an annular groove, (1, in the rear side, which is concentric with the opening B, and is designed to receive the end of the camera-tube. At one side of the annular groove is secured a curved plate, I), to which are pivoted two curved arms, 0, which are oppositely arranged with respect to each other, and are provided with notched ends (I, received between a binding-screw, e, and a plate, f, secured to the back of the shutterbody when the arms 0 are closed around the flange of the cameratube O, as shown in Fig. 2. The opposite or front side of the shutterbody A has a circular recess, 9, in which is placed a circular shutter, D, provided with a circumferentially -groovcd boss, 7L, which. is mounted revolubly on a Stud, 17, projecting in the axis of the shutter-body A from a plate, j, secured to the back of the shutter-body. The shutter D has an opening, 7.", corresponding to the opening B of the shutter'body, and in the periphery of the shutter D are formed the notches Z m.

To an arm, a, secured to the front of the shutter-body, nearits periphery, is pivoted a forked lever, E, having the long arm 0 and a .short arm, 0. To the short arm 0 is connected a cord, j), which is won nd partly around the boss h in the groove thereof, and secured to the boss by passing it through a hole near the edge ofthe boss and tying it in a knot or in any other convenient way. To the arm 0 of the lever E is fitted the slide q of the adjustable weight F. A set-screw, 0', passes through the side of the slide q, and clamps it in any required position on the arm 0. Weight F is preferably made cylindrical in form, and the slide q is attached to the end of the weight nearest the pivot of the lever E,to permit of projecting the opposite end of the weight beyond the end of the arm 0 when desirable.

To the face of the body A is pivoted a curved lever, G, on the screw s, which lever is provided at one end with an outwardlyprojecting arm, t, and also with an arm, a, projecting into the recess 9 in position to engage the notch Z in the edge of theshutter D. The end of the lever G on the opposite side of its pivot is provided with an arm, 0, which projects into the recess 9 in position to engage the notch min the periphery of the shutter D. This end of the lever G is also provided with an arm, 10, projecting outwardly toward the periphery of the body A,and on the periphery of the body is placed a curved slotted plate, (0, provided with a finger, I), projecting beyond the face of the shutter and capable of being moved forward opposite the arm 10. The plate a is held in position on the periphery of the body A by screws c,passing through a slot in the body of the plate. The body A is provided with a stop-pin, d, forlimiting the 1110 The tion of the lever G when the finger Z) is with drawn from the path of the arm HOll the lever.

A pneumatic cylinder, II, is supported by a plate, a, secured to the periphery of the body A, and contains a piston, f, the end of which touches the arm 1, carried by the lever G. The \l-shaped spring in, connected with the plate 0 and with the arm I tends to draw the arm I. and the end of the lever G, with which it is connected, toward the periphery of the body A and in opposition to the outward pressure of the piston f. The other end of the cylinder ll is connected by a flexible tube, g, with a pneumatic bulb, h.

The shutter l) is provided with a triangular pro ection, 17, and armsj in project from the body A over the shutter l) and in the path of the triangular projection '1". The arm /.r' is bent outward so as to present an inclined surface to the triangular projection 1 and thus arrest the motion of the shutter without jarring the camera. The arm is limits the forward motion of the shutter, and the arm j limits the return motion of the shutter. To the boss ll is secured an arm, Z, by which the shutter is returned to thcpoint of starting after having been released for making an exposure. A segmental plate, I, which is secured to the face of the body A, extends over the upper edge of the shutter D, and prevents the light from passing around the edge of the shutter at that point.

The operation of my improved shutter is as follows: The weight F having been adjusted on the arm 0, so as to secure the desired rapidity of motion in the shutter I), the shutter is turned backward, (into the position shown in full lines in Fig. 1,) winding the cord 1) around the boss 71 of the shutter and bringing the notch in under the end of the lever G,permitting the arm a to drop into the notch,thus holding the shutter in a closed position, with the weight F raised in position to turn the shutter when released. If it is desired to make an instzmeous exposure of the plate, the finger I) is moved forward over the arm 11*, thereby limiting the motion of the lever G- to the amount required to release the arm '0, carried by the lever from the notch in in the periphery of the shutter .l), and preventing the arm n from dropping into the notch 7. Pressure upon the bulb 71/ forces air into the cyliir der ll, which pushes out the piston f and re leases the shutter, so that it is immediately turned through a part of a revolution by the action of the weight it, through the medium of the lever E and the cord p, thus carrying the opening 7. past the opening l3 and past the end ofthe camera-tube. By moving the weight 1* outward on the arm 0 the rapidity of the exposure is increased.

\Vhen it is desired to make a time exposure, the finger I) is moved away from the path of the arm in, so that when the arm 7*, carried by the lever G, is released from the notch m the arm it, carried by the opposite end of the lever, will be pushed inward into the notch. 7,

so that the motion of the shutter D is arrested when the opening 7.; ol' the shutter coincides with the opening 13 of the shutter-body and with the opening of the camera-tube. The exposurc continues so long as pressure is created on the piston f by compressing the bulb h; but when the bulb h is released the spring in returns the lever (It and piston f to their normal. position, thus releasing the shntterl) and allowing it to be moved forward by the action of the weight F and close the opening.

To provide for holding the shutter permanently open while focusing, or for a very long exposure, a pin, a, is inserted in a hole in the shutterbody through the notch I.

By means of my im n'ovcment I am enabled to secure a uniform movement of the shutter D, which may be easily regulated. by adjusting the weight F on the arm 0.

It is obvious that the cord 1) may be at tached to the arm 0 of the lever 1* and that the adjustment of the weight F may be effected by reversing it on the army when it is desired to bring the weight near the pivot of the lever E. It also obvious that the opposite end of the cord 1 may be secured to some part of the shutter-disk instead. of being wrapped partly around the boss.

In case it becomes necessary to connect the shutter with the camera-box indepemlcntly of the camera-tube, the arms 0 and landing-screw 0 will be dispensed with, and other and well known means of fastening will be employed.

.lEfaving thus described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. The combination, with the oscillating shutter D, provided with the notches Z in, and the projecting portion intermediate between the notches, of the lever (l, n'ovidcd with arms 1/, 0, arranged to be received in the notches in alternation, the notch lbeing shorter than the notch m, as herein specified.

2. The combination, with the shutter D, provided with notches l m, and the weighted lever E, of thelever (1, provided with the arms a 1* a, and the plate 0., having the linger b for limiting the motion of the. lever G, sul) stantially as herein shown and described.

I}. The combination, with the shutter I), provided with notches Z in, and the weighted lever E for moving the shutter, of the lever G, provided with arms a o 1/, and the pneumatic cylinder it, having the piston f arranged to engage the arm I and the V-shaped spring in arranged to oppose the action of the piston f, substantially as shown and described.

it. The combination, with the shutter-body A, provided with the opening ll and annular groove a, of arms 0 and means, substantially as shown and described, for clamping the arms in a closed position.

WILLIAM ll. Ll1l\VlS.

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Em: .tn Tivrn, Ibnwn. M. CLARK.