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Патент USA US2137131

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Nov. 15, 1938.
|_. cHELl
Filed Deo. 2s, 1955
.o o
Patented Nov. 15, 1938
Inkl Cheli. Savona, Italy
Application ummm», z3, 1935, semi Nq. 55,903
nl muy umn 15. 1935
4Claims. (CL 20G-46)
This invention has for its object some new and
panels or other means to be operated electrically.
The invention aims to provide a switching de
connected to a terminal of the electric device to
be operated and in the present instance with the
lamps l to 'l arranged in parallel. In the pre
ferred embodiment described and shown the
vice adapted to be operated by elastic yielding
insulating board A is enclosed in a metallic frame
pressure means, either pneumatic or mechanical
ones, by employing metallic or otherwise cur»
C to which the return wire M leads connected to
the other terminals of the lamps I to 1 through
improved means for selectively switching lamp
rent-conducting stencils provided with protrud
ing contact points adapted to selectively closea
10 number of electric circuits including the lamps
to be lighted on the panel.
The invention aims principally to eliminate all
-movable contact members, as slidable pins,
plungers and the like, thus ~simplifying the
r switching device and insuring a reliable opera
tion under all conditions.
According to the invention this is obtained by
providing an insulating board carrying the usual
contact heads ntted at regular intervals and ar
ranged in the usual manner like the lamps on the
panel, and by connecting one end of each of
these contact heads to the corresponding lamp
` on the panel, the other terminals of the lamps
being connected through the source of electric
f energy to the return Wire leading to a metallic
part iitted near the switch board proper, the Whole
being- so iîtted that by yieldingly pressing a me
tallic plate, Vhaving protruding contacts, against
the switch board, a number of circuits is closed
through the said protruding contacts cf the plate,
the body of the plate and a part of this plate
contacting with the metallic part fitted near
the switch board and connected with the return
'I‘he invention will be better understood by the
following specification with reference to the at
tached drawing, in which:
Figure l is a transverse section through a de
vice according to the invention operated by the
40 pneumatic means;
Figure 2 shows diagrammatically how a plu
rality of devices according to Figure 1 can be con
nected to a common pressure line controlled by
a motor operated distributing valve;
Figure 3v shows another embodiment of the
invention- by which a mechanical pressure in
stead of a. pneumatic one is employed;
Figure 4 shows a part of a contact stencil in
which protruding contact points are embossed
50 forming the letters RE; and
Figure 5 is a. section on line V--V of Figure 4.
The device according to the invention is sub
stantially constituted by a board A of insulat
ing material fitted at regular intervals with a
55 number of metallic contacts B each of which is
the source of electric energy (secondary winding
of transformer L).
As it will be apparent from the following de
scription of the operation, it is essential that the
free heads of contacts B lie under the plane oi the
insulating surface on which the contact stencils
K should bear.
The selective closure of the electric circuits is
effected by means of contact stencils preferably
constituted, as particularly shown in Figures 4
and 5, by metallic plates K, provided with a
number of projecting points or embossings I
stamped or otherwise fitted at like intervalsas
the contacts B of the contact board A. If these
stencils should serve to light a number of lamps
on the lamp panel, the embossings are made on
the stencils so as to reproduce the letters or other
signs to be formed by the lighted lamps on the
panel (cfr. letters RE in Figure 4).
In Figure 1 a pneuniatically operated device for
use with the improved stencils shown in Figures
4 and 5 is shown. In the board A of insulating
material a number of contacts B is embedded,
as usual for swìtchboards of this kind, each of
which is connected through an insulated wire N
to one of the terminals of the socket of a lamp
(I to 1), the number and disposition of the con
tacts on the board being as usual the same as
that of the lamps on the panel. The other termi
nals of all the lamps on the panel are connected
to a common wire M_ (or eventually to the
ground) which is connected through the source
of electric current (secondary winding of trans
former L) to the metallic frame C of the board
A. Frame C together with board A constitute the
bottom part of a kind of casing closed by a me
tallic cover D.
Frame C has upwardly projecting parts Y serv
ing as abutment members for a pair of metallic
angle bars E. Between the horizontal wings of
angle bars E an insulating sheet F is iltted having
a number of perforations corresponding to and
arranged in the same manner as contacts B, the 50
thickness of this insulating sheet being preferably
a. little> more than the height of the embossings
I of stencil K.
The width of stencil K is substantially equal to
the distance between the vertical wings of angle
bars E, which thus serve as -guide bars for the
The cover D is hollow and under its borders an
elastic or otherwise yielding sheet G, made of
rubber or the like, is attached. Thus between the
cover D and the elastic sheet G an air chamber
O is formed in communication with a source of
pressure fluid through nipple H.
The operation of the device is as follows: Suit
able stencils, previously prepared by embossing
the projecting contact points I spaced like the
contacts B on board A and forming the signs to
be reproduced on the lamp panel are inserted be
tween the angle bars E under the elastic sheet G.
15 Each of the projecting points or embossings I
enters thus a perforation oi the insulating sheet
F and cornes to lie in front of a contact head B,
but without touching it. By introducing a pres
sure fluid (air) through nipple H into chamber
20 O, the elastic sheet presses the stencil K towards
the board A, thus forcing the embossings I into
contact with the corresponding contact heads B,
while the borders of the metallic plate are forced
into Contact with the horizontal wings of angle
25 bars E.
Thus a number of electric circuits are
completed through embossings I, the correspond
ing contacts B, conductors N and lamps (|-4--5) ,
return wire M, secondary winding of transformer
L, frame C, bars E and stencil K, integral with
30 embossings I.
A number of these devices may be arranged in
Thus stencils may be made by inserting metallic
points, or pins, into metallic or otherwise ccn
ductive plates; the device may be employed for 10
selectively switching any kind of electric devices,
other than-lamps, and the stencil may be pressed
against the contact carrying board even by other
means, as by electro-magnets.
It is to be understood therefore that the inven 15
tion shall be limited only by the appended claims.
I claim:
1. A pattern switch for electric signs, including
an insulating member, contacts extended through
the member and exposed at the upper and lower 20
ends, a box of conducting material in which the
insulating member is positioned, angle plates se
cured to the box and in electrical contact there
with, said angle plates being arranged beyond the
area of the insulating member, a compressible
insulating strip overlying the insulating member
and formed with openings in registry with the
contacts in such member, said strip being posi
tioned between the horizontal arms of the angle
plates and having a thickness exceeding the thick 30
ness of such horizontal arms, a metallic stencil
parallel, _as shown in Figure 2, connected to a
plate overlying and resting upon the insulating
common source of pressure iluid Q through a
strip and positioned within and guided by the
vertical arms of the angle plates, said stencil
distributing valve P that can be of a rotary type
r and eventually actuated by a motor R. By insert
ing in each of the devices a stencil bearing signs
or iigures slightly displaced with regards to the
adjacent ones, the eiïect of moving pictures can
to insert between plate T and stencil K a some
what yielding pad S, as a felt, a soit rubber sheet,
an air cushion or the like. This prevents jam
ming oi’ points Iasainst contacts B and deteriora'
tion both of the stencils and of the contacts B.
It is apparent that the embodiments as shown
and described are given only by way of example.
plate being formed with depending projections in 35
line with the openings in the insulating strip, a
pressure strip overlying the stencil plate, and
means for creating pressure on the pressure strip
be obtained on the lamp panel.
In Figure 3 a device is shown that in its lower
projections of the stencil plate to engage the con
part is substantially like to that shown in Fig
tacts in the insulating member.
ure 1.
2. A construction as deilned in claim 1. where
in the depression of the stencil plate into engage
ment with the contacts causes the edges oi' said
plate to engage the horizontal members of the 45
However, in this case the pressure on the
stencil K is produced by mechanical means act
ing on the rigid plate T.
In the case as shown the pressure means are
constituted by wing nuts U bearing on plate T
and screwed on threaded stems V integral with
frame C and passing through holes bored in the
plate T. Of course, it is possible to employ other
pressure means as cams, etc.
However, in case
a mechanical pressure is employed, it is necessary
to compress the insulating strip and permit the
angle plates for better electrical connection.
3. A construction as defined in claim 1, where
in the pressure means is pneumatic.
4. A construction as defined in claim l, where
in the pressure means is mechanical.
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