US402712A - Ground-glass attachment for cameras - Google Patents

Description

M. BAUER.

GROUND GLASS ATTACHMENT FOR CAMERAS. No. 402,712.

(No Model.)

Patented May 7, 1889.

A TTORNEYS.

UNITED STATES PATENT OFFICE.

MAX BAUER, OF BROOKLYN, NEIY YORK.

GROUND-GLASS ATTACHMENT FOR CAMERAS.

SPECIFICATION forming part of Letters Patent No. 402,712, dated May *7, 1889.

Application filed September 10, 1888. Serial No. 284,976. (No model-l To a]! 157mm it 71mg concern/.-

Be it known that I, MAX BAUER, of Brookl yn,in the county of Kings and State of New York, have invented a new and Improved Ground-Glass Attachment for Cameras, of which the following is a full, clear, and exact description.

The object of the invention is to provide a new and improved attachment for holding ground glass to the back of a camera, at the same time serving to hold the plate-holder in place.

The invention consists of a back frame, springs secured to the said back frame, and a ground glass secured to the ends of the said springs, so that thelattcr supports the ground glass on the back frame.

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 l is a face view of the improvement with parts broken out. Fig. 2 is a sectional plan view of the same on the line a 50 of Fig. 1. Fig. 3 is a sectional end elevation of the same on the line 3 y of Fig. l, and Fig. 4 is a rear face view of part of the ground-glass frame and springs.

The back frame, A, of the camera supports two parallel springs, B B, secured in their middle by rivets or screws C, or other suitable means, to the said back frame, A. The free ends of the sprii'igs B B are secured to the rear side of the ground-glass frame D, supporting, in the usual manner, the ground glass E. The springs BB are fastened to two opposite sides of the said frame D near their outer ends, as is plainly shown in the drawings.

The springs B are preferably placed in grooves F, formed in cleats G, running parallel with each other, and secured on the outside of the back frame, A. The inner edges of the cleats G also form a resting-place for the shoulders D, formed on the two opposite sides of the frame D, and serving to hold the said frame and the ground glass E in place on the back frame, A.

Each of the cleats G is provided near its outer end with an offset or shoulder, G,

against which fit the outer edges of the oppo- A similar shoulder,

site sides of the frame D.

D, is formed atthe left-hand end of the frame D, said shoulder abutting against the cleat G connecting with the cleats G, before mentioned. In the right-hand end of the frame D is formed a notch, H, for permitting the operator to conveniently open the frame D in order to insert the plate-holder.

The ends of the springs B B are preferably secured, by means of screws or rivets I, to two opposite sides of the frame D, said screws or rivets I passing through longitudinal slots J, one of which is formed in each end of each spring B. These slots J permit a free move ment of the springs B when the frame D is opened for the insertion of the plate-holder. The springs B B have the tendency to hold the frame D and its ground glass E tightly in place on the back frame, A, so that the ground glass E is always in place on the frame A, said springs B B forming the support for the said frame D and the ground glass E.

lVhen the operator desires to insert the plate-holder, he takes hold of the frame D by its notch H and pulls the said frame outward sufficiently to insert one end of the plateholder between the frame A and the frame D. The operator then pushes the plate-holder inward, whereby the springs B B yield and permit a free and easy insertion of the plateholder. hen the latter is pushed fully into place 011 the frame A, the springs B B press the frame D firmly against the plate-holder, so that the latter is held firmly in place on the frame A.

Thus it will be seen that the arrangement, as shown and described, has a twofold purpose-first, of supporting the frame 1) and its ground glass E on the back frame, A, and, second, of holdii'lg the plate-holder in place when inserted on the back frame.

It will further be seen that the entire arrangement has a very neat appearance, and the springs B are completely out of sight, being covered by the frame D in the recesses F.

Having thus fully described my invention, I claim as new and desire to secure by Letters Patentl. A ground-glass attachment for cameras, comprising a back frame, springs secured to the said back frame, and a ground-glass frame, on which the free ends of the said springs are secured so that the said. springs support the ground-glass frame on the said back frame, substantially as shown and described.

2. The combination, with a back frame provided with cleats each having a recess, of a spring secured in its middle in the recess of each of the said cleats, and a ground-glass frame secured to the free ends of the said springs at two opposite sides, substantially as shown and described.

3. The combination, with a back frame pr0- vided with two parallel cleats each having a recess, of a spring secured in its middle in the recess of each of the said cleats, each of the said springs being provided at its ends with slots, a frame containing the ground glass and supported on the said springs, and screws pass- MAX BAUER.

Witnesses:

EDGAR TATE, C. SEDGWICK.

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