US739586A

US739586A - Lens-board clamp for cameras.

Info

Publication number: US739586A
Application number: US16677302A
Authority: US
Inventors: Frank B Case
Original assignee: Individual
Current assignee: Individual
Priority date: 1902-12-29
Filing date: 1902-12-29
Publication date: 1903-09-22
Anticipated expiration: 1920-09-22

Description

1%.. 739,586. 7 PATBNTED SEPT. 22, 1903 I P. B. CASE. LENS BOARD CLAMP FOR CAMERAS.

APPLICATION rnnn D30. 29. 1902. nminwsn JULY 23.1903.- 10 IQDEL.

M6 @111,- 0% M 4m m1. z

Patented September 22, 1903.

PATENT OFFICE.

FRANK B. CASE, OF ROCHESTER, NEW YORK.

LENS-BOARD CLAMP FOR CAMERAS.

SPECIFICATION forming part of Letters Patent N 0. 739,586, dated September 22, 1903. Application filed December 29,1902. Renewed July 23, 1903- Serial No. 166.773. (No model.)

To 0. whom it may concern:

Be it known that I, FRANK B. CASE, a citizen of the United States, residing at Rochester, in the county of Monroe and State of New York, have invented a new and Improved Lens-Board Clamp for Cameras, of which the following is a specification.

This invention relates to mechanism for securing the lens-board of acamera-front in any desired position of vertical adjustment between its supporting-standards.

The purpose of the present invention is to provide a clamping device for a lens-board of a camera-front which shall not tend to spread the standards of the lens-board when such lens-board is clamped in place and one also which shall not necessitate the removal of a screw before the lens-board can be entirely removed from between its supporting-standards and also one of such a character that a careless handling of the device, such as screwing the clamping-screw in too far, will not break any of the cooperating parts of the camera-front.

The several figures of the accompanying drawings, illustrating my invention, are as follows:

Figure l is a face or front view of a lensboard a, supported from a suitable base g. Fig. 2 is a sectional view of the lens-board a and standard Z), taken along the dotted line o: y in Fig. 1, with all the parts above such line removed. Fig. 3 is a left-hand edge view of the board a as seen in Fig. 1.

Similar letters refer to similar parts throughout the several views.

Referring to the drawings, a is a lens-board of usual construction and supported in the usual manner that is, tongues are formed on the edges of such board a, which enter grooves made therefor in the standards b1), which are in turn rigidly secured at their lower ends to the base-piece g. The standards b b are secured together at their upper ends by the brace o. The tongue formed on the right-hand edge of the lens-board a is continuous, as is usual, while the tongue formed on the left-hand end, as seen in Fig. l, of such lens-board a, consists only of the sections a and a formed on the cross-pieces a and a of such front board. These crosspieces a a and the lens-board a are framed together with grooves and tenous in the usual manner.

The left-hand edge, as seen in Fig. 1, of the middle section of the lens-board a is grooved and in such groove the metal stripsfandf are inserted loosely, as indicated, so as to project from the board a in about the same way that the tongue (i a does. These strips ff are kept apart, as indicated in Fig. 3, by depressions stamped in such strips. A nut e is located near the center of the standardb in a hole bored through such standard, as indicated, and is prevented from turning and pulling out through the standard by the projections e 6 as indicated iu'Fig. l, to accommodate which the groove in the standard I) is deepened a little near the center thereof. A thumb-screw d, bluntly pointed at its inner end, is threaded through the nut e in such a way that the point will enter between the strips ff when such screw 61 is turned in through such nut c. This action, as indicated in Fig. 2, will separate the strips ff and press them against the sides of the groove in the standard I) and at the same time will force the board or against the standard I) and take out all the play that exists when the board a is being adjusted. Thus when it is desired to adjust the board a vertically between the standards I) b the screw (1 is turned out from between the strips ff, their pressure against the standard I) is relieved, and the desired adjustment may be effected. Then the screw dis turned in, the strips ff are forced apart against the sides of the groove in the standard b, and the board a is again secured between the standards b. It will at once he understood that the pointed end of the screw dis so conformed that when the same is turned clear in as far as it will go the strips ff will be separated just far enough to firmly bear against the sides of the groove in the standard b, but not with sufficient force to split the standard 17 by forcing apart too far the portions thereof either side of the groove therein. The length of the screw (1 should of course be so proportioned that when turned clear in it will not force the board a toward grooved member having thereon a divided or slotted tongue and such grooved member carrying a screw arranged when turned in, to force apart and against the sides of the groove in such grooved member the portions of the divided or slotted tongue on such tongued member, such divided tongue consisting in two separated strips of suitable material inserted in a groove in such tongued member and projecting therefrom into the groove in such grooved member.

FRANK B. CASE. Witnesses:

ALBERT O. BELL, A. PEARL MOORE.