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Патент USA US2404821

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July 30, 1946.
W. U. ZELLER
2,404,821
COLLAPSIBLE CONTACT PRINTER
Filed Jan. 26, 1945
2_Sheets'-Sheet 1
gnucmfo'o
-
2,404,821
Patented July 30, 1946
UNITED STATES PATENT OFFICE
2,404,821
COLLAPSIBLE CONTACT PRINTER
Wilbur Ulric Zeller, United States Army,
New York, N. Y.
Application January 26, 1945, Serial No. 574,669
4 Claims.
(01. 95-73)
(Granted under the act of March 3, 1883, as
amended April 30, 1928; 370 O. G. 757)
1
The invention described herein may be manu
factured and used by or for the Government for
governmental purposes, without payment to me
of any royalty thereon.
This invention relates to contact printers used
2
ing plate whereby light of uniform intensity is
projected to all parts of the copying plate.
A still further object of this invention is to
provide a collapsible contact printer having a
light panel assembly provided with ?ange por
tions at the ends thereof adapted to engage either
a pair of leg braces or the lower edges of the
end walls of the copying vframe.
printers.
Other objects will be apparent from the fol
Numerous attempts have been made to provide
a collapsible contact printer or copying apparatus 10 lowing description of the invention and the ac
companying drawings in which:
which is adapted to be folded into a small com
Figure 1 is a perspective View of the collapsible
pact form and easily transported. One such at
contact printer in its operative position;
tempt was disclosed in Patent Number 1,651,954,
Figure 2 is top plan view of the contact printer
issued December 6, 1927, to Arthur Heyer. The
copying apparatus disclosed in this patent com 15 with portions removed;
Figure 3 is a side view in cross-section of the
prised a conventional copying frame supported
in photography for making light transfer prints
and more
particularly to
collapsible
contact '
by U-shaped straps of ?at iron having stays ex
tending between the straps and secured thereto
by cotter pins or the like, and a light-imperme
able bag depending from said copying frame. 20
The light source consists of a standard glow lamp
contact printer taken along line 3?3 of Fig. 2;
Figure 4 is a bottom perspective view of the
contact printer in its collapsed position;
Figure 5 is a top plan view of a combined
carrying case and developing trays for use with
the contact printer; and
Figure 6 is a perspective view of the carrying
case with the contact printer supported therein.
rigid or stable and it was not adapted to be 25 Referring to the drawings, the contact printer
supported by a separable ?xture. The foregoing
device, while an improvement in the art, was
not entirely satisfactory since it was not unitary,
disassembled simply and easily.
This device was
furthermore incapable of projecting light of uni
form intensity on all parts of the copying plate
since no means were provided for maintaining
the form of the light bag or for positioning the
source of light at the same predetermined point
each time the apparatus is used.
This invention is an improvement over the
invention disclosed in the above patent and the
principal object of this invention is to provide
a collapsible contact printer which may be simply
and easily folded to occupy a small amount of
space.
comprises a frame I 0 having side walls H and
end walls l2 formed of sheet metal. The upper
edges of the side and end walls are folded in
wardly upon themselves to provide a ?ange mem
her [3. Angle members 14 are mounted on the
inner faces of the side and end walls I! and
I2 and extend entirely around the inner upper
end of the frame l0, being spaced a slight dis
tance below the upper edge thereof to provide
a support for a transparent glass or transparent
synthetic resinous copy plate 15. The over-all
dimensions of the frame [0 oi? the printer are
such that the copy plate 15 is large enough to
accommodate legal-size documents. The printer
Another object of this invention is to provide
a collapsible contact printer which is rigid and 40 is provided with a cover l6 consisting of a pair
of plates I'I-Il connected by a hinge [9. The
stable in both its operating and collapsed posi
outer ends of the plates l'l-l1 are turned down
tions.
to form the ?anges Ila??-I?la, one of which is
Another object of this invention is to provide
pivotally secured to an end wall I?! of the frame
a collapsible contact printer in which the various
parts are in interlocking engagement in either 45 H! by a hinge ?25. The plates H-l1 have felt
pads 2l?-2l attached to their lower faces which
the operating or collapsed positions to prevent
are adapted to engage the surface of the copy
relative movement between the parts.
plate l5 when the cover I6 is closed or to press
Still another object of this invention is to
sensitized paper and documents into intimate
provide a collapsible contact printer which is a
60 contact with the entire surface of the copy plate
self-contained, wholly unitary structure.
I5 to obtain clear photographic prints.
A further object of this invention is to pro
The printer is provided with a bellows 22 which
vide a collapsible contact printer having a plu
is attached to the inner lower face of the frame
rality of light sources and a light reflecting
I!) by a pair of side plates 23 and a pair of end
means each adapted for positioning in a prede
termined relationship with respect to the copy 55 plates 24. The bellows 22 is formed of light
3
4
weight leather or a durable fabric and is coated
with aluminum pigmented paint or lined with a
white material to provide a light re?ecting sur
face. The upper ends of the bellows 22 are
support 35 and the strips 29 and 3t! and prevents
horizontal movement of the panel support 35
clamped between the end and side walls of the
frame In and the end and side plates, and the
respective members are then secured by screws
25 which pass through threaded apertures pro
vided in the members. The printer is also pro
vided with four legs 25-46 and 2?a~26a formed
of sheet metal angle strips. The legs have aper~
when the members are so engaged.
The angles
56-56 are also adapted to engage the outer faces
of the lower edges of the end walls I 2 of the frame
it and thus prevent movement between the light
panel assembly 33 and the frame I0 when the
printer is collapsed. A pair of angle members
5l-5i are mounted on the panel support 35 and
spaced apart a distance slightly larger than the
length of the light panel 3%. The angle member
tured extensions 21 arranged to engage the side
51 adjacent the rotary switch 133 has a slot 52
walls I! of the frame l0 and thus form pairs of
right hand legs 26?26 and left hand legs
formed therein through which the wires forming
the'circuits ?i2 and 46 may extend to the switch
it and the plug 4'1. The wires forming the cir
?irt-26a. The pins 28 pass through the aper
cuits t2 and 45 also pass through a recess formed
tures in the extensions 2'! and corresponding
in the panel support 35 by the stamped portion
apertures in the side walls of the frame It. The
legs 26 may thus be pivoted about the pins 28
35b. The bottom plate 35 which is formed of
?Bakelite? or other rigid electrical insulating ma
and folded along the lower edge of the side walls
II. The pairs of legs at adjacent ends are pro 20 terial is attached to the lower face of the panel
support 35, A plurality of registered apertures
vided with reinforcing metal strips or braces
are formed in the panel fill and the plate 3'6
29 and 3B which are welded to a side of each
leg angle. The reinforcing strip 30 has an off
through which the bolts 53 pass. The plate 36
is also provided with a cut-out portion 38a which
set portion 3| formed therein and both of the
is adapted to ?t around the stamped portion 35b.
metal strips 29 and 30 have elongated openings
32 formed therein.
?
The lower ends of the bellows 22 extend down
wardly along the vertical faces of the angles 51,
The lowermost end of the bellows 22 is con
and the ?anges ii8?li8 extend thence horizontally
nected to a light panel assembly indicated gen
between the edges of light panel 34 and the ledge
erally as 33. The light panel assembly 33 com
portions of the panel support 35 adjacent the
prises a light panel 34, a panel support 35 and a
bottom plate 35. The light panel 31; is a rigid
opening 35a where it is clamped therebetween by
tightening the bolts 53.
rectangular plate formed of ?Bakelite? or other
It is apparent from the foregoing description
electrical insulating material. The panel 34 is
provided with a plurality of apertures in which
that the operative position of the contact printer
are mounted the porcelain or ?Bakelite? lamp
is that in which the legs its-25 and 26a?-2'5a are
arranged vertically, the bellows 22 extended and
Sockets 3'! which are adapted to receive the ?ash
the leg braces 29 and 3&1 engaged in the channels
light bulbs 38. Near the center of the panel 36,
additional apertures are provided in which a
formed by the ?anges E-9?1-i?i and the angles
clamp 39 and the contact ?ngers li?i?d? are
5d?. The ?ashlight bulbs 33 and the electric
mounted. The jaws of the clamp 39 are adapted 4.0 lamps 135 are located at a point from which either
to receive and engage the insulated sides of a
source of light, depending upon which the opera
standard ?ashlight dry cell ill and the contact
tor desires to employ, may project light, equally,
?ngers 66 are adapted to engage the positive and
in the proper amount on all parts of the copying
negative terminals of the dry cell Q l. The contact
plate IS. The ?xed and predetermined rela
?ngers M are connected with the lamp sockets 3}? do tionship of the bellows 22 and the light panel 34
with respect to the copying plate It supported
through a suitable circuit 152 which includes a
standard single position o? and on rotary hand
by the frame iii insures an even distribution of
switch
that is mounted on the panel support
light on the document and the sensitized paper
35.
dditional apertures are provided in the
supported by the plate 95. The interlocking en
light panel 3% in which the small 110-volt clamp 50 gagement of the various parts of the contact
type lamp sockets Ml provided with contact ?n
printer provides a strong, rigid and stable con
gers Ma are mounted. The sockets 1515 are adapt
struction. In operation, the cover it is raised
ed to receive the bulbs (i5 and are connected by a
and the document to be copied and sensitized
suitable circuit lit with a standard male plug 4?
paper of a suitable grade are placed on the sur
which may be connected in turn with a 110-115
face of the copying plate 15. The cover [6 may
volt source of current.
then be closed and the felt pads 2i--2l pressed
The panel support 35 is formed of a rectangular
against the document and sensitized paper, thus
piece of sheet metal having its sides and ends
forcing the latter into intimate contact with each
folded upwardly to provide the ?ange members
other and the copy plating 15 in the customary
Ai3??8 and 4S~Ji9 respectively. The panel sup
manner. The rotary switch 43 may then be
port is also provided with a rectangular opening
turned on, allowing current to flow from the dry
35a which is small enough to form a ledge adja
cell iii through the circuit ?32 thus lighting the
cent the ?anges fiti?l53 and ?Q?9 for supporting
?ashlight bulbs 33. The light from the bulbs 38
the light panel 31%, The angle members 55] are
is projected on the copying plate �for prede
welded to the panel support 35 and are spaced
termined length of time according to the judg
slightly apart from the flange members 69 to pro
ment of the operator, following which the rotary
vide a channel which is adapted to engage the
switch � is turned off. If a standard 110-115
sides of the metal strips 29 and 39, The width of
volt alternating current source is available, the
the panel support 35 and the angles 56 is slightly
male plug fl?i may be connected thereto and by
less than the length of the elongated openings 32
means of a suitable switch current may be sup
in order that the vertical edges adjacent the open
plied through the circuit 45 to the lamps 45.
ings 32 extend downwardly past the edges of the
Following its exposure, the sensitized paper may
panel support 35 when the latter engages the
be removed from the printer and developed in
strips 29 and 38. The arrangement described
the usual manner. While it has not been dis
permits positive engagement between the panel
closed, a conventional form of timing switch such
2,404,821
as that disclosed in Patent Number 2,336,663, is
sued December lei, 1943, to Carl F. Wolters, et al.,
may be mounted on the panel support 35. Such
a timing switch may be included in either of the
circuits 42 and 4.6 or in both and may be con
nected in series with the rotary switch 43 or the
6
carrying case as shown in Figure 6 and may be
easily transported or stored in a small place in
its collapsed position.
Having thus described my invention, what I
claim as new and wish to secure by Letters Pat
ent is:
1. A collapsible contact printer, comprising a
frame, a copying plate mounted adjacent the up
per end of ?said frame, leg members pivotally
bulbs 38 or the lamps 45 may be partially com
pleted and subsequently completed by the tim 10 connected to said frame adjacent the ends there
of, said leg members being adapted to be folded
ing switch. The conventional form of timing
upon said frame, leg braces secured to adjacent
switch may be set to control the circuits so that
male plug 47. Thus with the switch 43 or the
male plug 47, the circuits carrying current to
they are closed for a de?nite period of time au
tomatically determined by the timing mecha
nism within the switch structure.
The printer may be collapsed by disengaging
the leg braces 29 and 30 from the channels formed
by the ?anges 49-49 and the angles 50-50.
The bellows 22 is then folded by forcing the panel
support 35 toward the frame 10. The angles
50-50 are engaged with the outer faces of the
lower edges of the end walls l2 of the frame ID.
pairs of leg members at the ends of said frame,
a ?exible bellows, the upper edges of said bellows
being attached to the lower end of said frame,
a light panel, illuminating means mounted on said
light panel, and a light panel support having a
pair of spaced ?ange members adjacent each end
thereof and adapted to engage said leg braces,
said light panel and said light panel support
being attached to the lower edges of and sup
ported by said bellows.
2. A collapsible contact printer as set forth in
claim 1 characterized in that the lower edge of
the frame ID until one side of each of the angles 25 each of said leg braces is provided with an elon
gated opening adapted to receive an end of said
forming the legs 26-26 extend downwardly along
light panel support having spaced ?ange mem
the lower outer edges of the side walls [I of
bers mounted thereon, said spaced ?ange mem
the frame 10. The brace 29 engages the light
bers being adapted frictionally to engage a leg
panel assembly 33 and forces it downwardly
toward the frame 10. The pair of legs 26a-26a 30 brace and the vertical edges in each of said leg
braces adjacent said openings being adapted to
between which the brace 30 having the off-set
extend below the edges of said light panel support.
portion 3| extends are similarly pivoted down
3. A collapsible contact printer, comprising a
wardly until one side of each of the angle strips
frame providing side and end walls, a copying
forming these legs engages the corresponding
plate mounted adjacent the upper end of said
angles of the legs 26-26 which have already
frame, leg members pivotally connected to the
been folded. The o?-set portion 3| permits the
side walls of said frame adjacent the ends there
legs 26a-26a to fit snugly on the legs 26-26.
of, said leg members being adapted to be folded
The printer is thus completely collapsed into a
upon
said frame, leg braces secured to adjacent
small compact form as shown in Figure 4. The
various parts of the printer are interlocked and 40 pairs of leg members at the ends of said frame,
a flexible bellows, the upper edges of said bellows
all relative movement therebetween is eliminated
being
attached to the lower end of said frame,
thus avoiding breakage or other damage.
a light panel, illuminating means mounted on
The printer described may be easily trans
said light panel, and a light panel support hav
ported since it occupies a very small amount of
ing a pair of spaced ?ange members adjacent
45
space. A suitable carrying case is shown in Fig
each end thereof adapted selectively to engage
ures 5 and 6 consisting of upper and lower re
either said leg braces when the printer is in an
ceptacles 54 and 55 formed of sheet metal. The
operative position or the outer face of the lower
receptacles 54 and 55 may be connected by de
edges of said end walls when the printer is in
tachable hinges 56-56. The carrying case is also
provided with the conventional latches 51 and a 50 a collapsed position, said light panel and said light
panel support being attached to the lower edges
pair of handles 58-58. One feature of the car
of and supported by said bellows.
rying case described is that the upper and lower
4. A collapsible contact printer as set forth in
receptacles 54 and 55 may be separated by mov
claim 3 characterized in that one of said leg
ing these members laterally to separate the hinges
56 and the receptacles thus adapted for use 55 braces is provided with an off -set portion adapted
to extend across the lower face of said light
individually as developing trays. The carrying
panel support and downwardly past the edges
case is made large enough to hold not only the
thereof when said printer is in a collapsed posi
collapsed printer but also a supply of sensitized
tion.
paper and developing materials in a dry form.
WILBUR ULRIC ZELLER.
The contact printer when collapsed ?ts into the 60
The pair of legs 26-26 between which the leg
brace 29 extends are pivoted downwardly toward
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