Патент USA US2056463код для вставки
Oct. 6, 1936. ' _ w. c_ HUNT 2,056,463 CASSETTE Filed Dec. 8,‘ 1931 - 2 Sheets Sheet 1 2,056,463 Patented Oct. 6, 1936 " UNITED STATES PATENT OFFICE 2,056,463 CASSETTE Wayne 0. Hunt, Chicago, 11]., assignor of forty lg?i cent to G. G. G. Peckham, Shaker Heights, 0 Application December 8, 1931, Serial No. 579,678 1 Claim. (Cl. 2250-34) This invention relates to improvements in cas settes or holders for sensitized ?lms and intensi ?ers used in connection with X-ray apparatus. One of the principal objects is to provide a 5 cassette which may be manipulated for insertion and removal of the ?lms and intensi?ers by the use of only one hand. A further object is to provide such a device which can be so operated in a shorter time and with less effort. A further 10 object is to provide a lighter device of this type without any sacri?ce of rigidity. A further ob ject is to provide novel means for the prevention of fogging of the plates by “back scattering” or secondary radiation. 15 I attain the foregoing and other and more limited objects, as will appear, in and through the construction hereinafter described and il lustrated in the accompanying drawings in which Fig. 1 is an elevation of the back of the cassette 20 showing the improved locking means in the po sition it takes when the cassette is locked; Fig. 2 | is a central longitudinal section showing the locking means in unlocked position; Fig. 3 is a fragmentary sectional view showing a modi?ed 35 form; and Fig. 4 is a section on line 4—4 of Fig. 1. Referring now to the accompanying drawings, the numeral l0 indicates a frame of rectangular shape composed of a bar of steel tubing bent to 30 shape and welded or otherwise secured to form a rigid unit and being preferably although not necessarily rectangular in cross section. Secured to the frame [0 is a window or front I l composed of a material of such tensile strength and rigidi 35 ty as to prevent bulging under applied pres sure and having the quality of being readi ly pervious to X-rays. For this purpose I prefer to employ one of the synthetic resins, such as bakelite. The window I I may be secured 40 to the frame ID as by a plurality of screws [2. Within the frame l0 and secured to the inner face of the window H, I provide a sheet of felt or similar material l3. At the central part of each of the sides of the frame In I provide milled 45 slots II. In one of the side members I provide slots l5 for reception of hinged knobs "5 carried by hinge members 11. The hinges I’! are se-‘ cured as by screws to the back l8 of the cassette. On the inside of the back It! is a sprayed coating 50 of lead l9 and a layer of felt 20, while on the outside is a locking means and control therefor adapted to cooperate with the slots M in the frame Ill. The sprayed coating of lead serves to prevent fogging of the ?lms due to back scat 55 tering, while the layer of felt 20 cooperates with a similar layer l3 to hold the X-ray ?lm 2| and intensi?er if used. A plurality of slides 22 are slidably secured to the back I8 as by studs 23 extending through slots 24 therein. These slots may be continuous, 5 as shown, or individual to each of the studs, al though it is preferred to use the construction il lustrated. At the end of each of the slides adja cent the frame member with which it is related is an upwardly curved portion 25 adapted to enter 10 the corresponding slot M for the purpose of urging the back I8 into ?lm holding contact. The opposite end of each of the members 22 is formed into a hinge element 25 which cooperates with a pintle 21 and a corresponding hinge ele- 15 ment on the corresponding link 28. Each of the links 28 is hingedly connected with the central member 29, as indicated at 30. Between the hinge connections 30 the edge of the member 29 is preferably turned up, as shown at 3|, or 20 rounded off to assist the operator in grasping it. The back I8 may also be cut away through a por tion of its depth adjacent the parts 3| to provide ?nger openings 32. A tab 33 may be secured sim ilarly to the member 29 for grasping. 26 In the modi?cation shown in Fig. 3, the slid ing member 22 is allowed to contact the back [8 by reason of the countersinking of the col lar 23“ into the back l8, as shown. In other re spects this modi?cation is identical with that 30 illustrated in the other ?gures. It is an important feature of my invention that the degree of pressure can be determined and made uniform by the height of the up-curved portions 25 which engage in the slots Ill. The 35 use of square metallic tubing for the frame members is especially adaptable to this purpose, it being only necessary to provide the slot l4 extending completely to the upper wall of the tubing, as shown. Should it happen that too 40 much metal were cut away from the upper edge of the inner wall in the process of milling the slots M, the accuracy would not be impaired be cause the member 25 would extend far enough into the tube to engage the inner surface of the 45 upper wall. Furthermore, the use of the square metallic tubing for the frame members l0 results in considerable reduction in weight without loss of rigidity. In operation, the cassette just described may 50 be both unlocked and opened about the hinges by the same operation, namely, grasping the member 29 or tab 33 and pulling upwardly, Such operation results ?rst in withdrawal of the slides 22 to the position shown in Fig. 2 and 55 2 2,056,463 then by the same motion in hinging of the back l8 about the member It. The closing operation likewise can be performed with one hand; and a single operation su?ices both to close the back and lock the same in proper position. Having thus described my invention, what I claim is: In a cassette, a frame, a. window secured there to, a back hingedly connected therewith, adapted to be received therein and carrying latching means adapted to cooperate with said frame for holding such back in position with respect there to and pressing the same toward said window, a single control means for operating said latches and moving said back about its hinges, said con trol means comprising mechanism whereby a 6 continuous motion of a single element without abrupt change in direction results in unlatching the latching means and moving said back about its hinges or moving said back to closed posi tion and latching said latching means. 10 WAYNE C. HUNT.