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Патент USA US2056463

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Oct. 6, 1936.
w. c_ HUNT
Filed Dec. 8,‘ 1931
2 Sheets Sheet 1
Patented Oct. 6, 1936
Wayne 0. Hunt, Chicago, 11]., assignor of forty
lg?i cent to G. G. G. Peckham, Shaker Heights,
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.
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.
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
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.
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