US1854279A

US1854279A - Photographic printing frame

Info

Publication number: US1854279A
Application number: US376421A
Authority: US
Inventors: Edward R Smith
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-07-06
Filing date: 1929-07-06
Publication date: 1932-04-19
Anticipated expiration: 1949-04-19

Description

April 19, 1932. E. R SMITH PHOTOGRAPHIC PRINTING FRAME Filed July 6, 1929 A T TORNE YS.

H R 5 m m a A 0 2 wm Z 7 9 I P. O 0/ 3 L l m 00%]. 7 w m M 3 .W/QJ ..u 5

Patented Apr. 19, 1932 PATENT OFFICE EDWARD B. SMITH, F BERKELEY, CALIFORNIA PHOTOGRAPI-IIC PRINTING FRAME Application filed July 6, 1929. Serial No. 376,421.

The present invention relates to improvements in photographic printing frames and its principal object is to provide a frame of the character described, which is particularly simple in construction and easy to operate.

A further object of the invention is to provide a photographic printing frame in which retractable bolts are used for clamping the back upon the glass plate and in which a simac ple operating means is used for retracting the bolts, the said means being adapted to be used at the same time for lifting the back from the plate.

A further object of the invention is to provide a photographic printing frame of the character described, in which the bolts are constructed and operated in such a manner as to exert pressure on the back for clamping the same upon the glass plate.

.1, Further objects and advantages of my invention will appear as the specification proceeds.

The preferred form of my invention is illustrated in the accompanying drawings, in

. I; which Figure 1 shows a top plan view of my photographic printing frame; and

Figure 2, a section taken along line 2-2 of Figure 1.

While I have shown only the preferred form of the invention, I wish to have it understood that various changes or modifications may be made within the scope of the claims hereto attached without departing from the b5 spirit of the invention.

In its preferred form, my photographic printing frame comprises a rectangular frame 1 made of suitable material and formed with an inner ledge 2 adapted to receive the conventional glass plate 3. A back 4, of suitable material, 'is superimposed on the glass plate, it being understood, of course, that the negative and the sensitized paper used for making photographic prints are interposed between the glass plate and the back.

In two opposing walls of the frame, there are formed two recesses 5, somewhat above the glass plate and arranged in opposing relation, the upper Walls of the recesses being tapered, as shown at 6.

The back 4 has mounted thereon two latch bolts 7 which are slidably held in aligned relation in bearings 8, two bearings being pro vided for each bolt. The latter are preferably made to comprise a shank 9 and an end piece of somewhat larger dimension 10 adapted to enter the recesses 5 and formed with tapers 11 adapted to ride against the tapered upper walls of the recesses. Springs 12 encircle the shanks 9 between the two bearings and urge the end pieces into the recesses.

The inner ends of the shanks 9 have con fronting operating pieces 13 fastened thereto, the operating members preferably being made in the form of small bars rising from the shanks so as to allow an operator to grip the two bars between his thumb and his forefinger for pressing the same together against the opposition of the springs and for thereby After the two bars 13 have been drawn together, they may be used as lifting means for the back so that the operator can perform the two functions of drawing the bolts together and of lifting the back in a single operation with one hand and without the necessity of changing his hold.

The advantages of my invention will be readily understood from the foregoing description.

To insert the back, the operator grips the two bars 13 with his thumb and forefinger and pulls the same together, whereby the bolts are retracted and brought within the confines of the frame. Maintaining his hold, the operator lifts the back and lowers the same into the frame, whereupon he releases his hold, which causes the springs to advance the bolts into the recesses and to clamp the back upon the glass plate, or rather the negative, and sensitized paper interposed between the glass plate and the back.

For removing the back, the operator again draws the two bars 13 together by the aid of his thumb and forefinger, and without changing his hold, lifts the back out of the frame.

t should be understood that variations may be introduced into this device without changing the principle of the invention. The

withdrawing the bolts from the recesses.

back, for instance, may be made of spring material and slightly concave, particularly in larger frames, so that additional spring pressure will be exerted on the same when 5 the sides are depressed by the engagement of the bolts with the frame wall. The back may also be made in two sections, hinged together along a central line with a pair of bolts provided for each section.

I claim:

1. A photographic printing device comprising a frame formed with an inner ledge and recesses formed in the confronting sides of the frame with inclined upper faces, a

transparent member adapted to rest on the ledge, a back adapted to overlie the member, retractable bolts carried by the back having tapered en ls movable into the recesses against the inclined faces of the latter for pressing the back toward the transparent member, brackets encircling the bolts allowing the latter to freely slide therein, springs encircling the bolts urging the bolts into engagement with the frame, and finger gripping pieces anchored to the adjacent ends of the bolts allowing the latter to be withdrawn from the'frame and the bacl: to be lifted in a single operation.

2. A photographic printing device comprising a frame formed with an inner ledge and recesses formed in the confronting sides of the frame with inclined upper faces, a transparent member adapted to rest on the ledge, a back adapted to overlie the member,

retractable bolts carried by the back having tapered ends movable into the recesses against the inclined faces of the latter for pressing the back toward the transparent member, brackets encircling the bolts allowing the latter to freely slide therein, springs encircling the bolts urging the bolts into engagement with the frame, and finger gripping pieces anchored to the adjacent ends of the bolts allowing the latter to be withdrawn from the frame and the back to be lifted in a. single operation, said bolts and finger pieces being arranged within the confines of the frame when the back is secured in active position. EDWARD B. SMITH.