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Патент USA US2409618

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Oct. 22, 1946.
Filed July 18, `1942
2 Sheets-Sheet l
‘ 44
‘I l 50'30'
. 44
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0¢f- 22» 1946-
s. J. ELLIQTT Erm.
Filed July 18, 1942
2 Sheets-Sheet 2.
F/G. 3
SM. T/-lo/gmsl
Patented Oct. 22, 1946'
Stanley J. Elliott, Forest Hills, N. Y., Ole M. Hov
gaard, Murray Hill, N. J., and Rudolph F. Mal
lìna, Hastings-on-Hudson, and Frank M.
Thomas, Jackson Heights, N. Y., assignors to
Bell Telephone Laboratories, Incorporated, New
York, N. Y., a corporation of New York
Application July 18, 1942, Serial No. 451,506
6 Claims. (Cl. 200-30)
This invention relates to signal distributors,
and particularly to devices of that character
which are associated with radio receiving equip
to the motor are indicated at M. The lower four
contact pairs I, 2, 3, 4, which for convenience
will hereinafter be called the lower deck con
The object of the invention is to provide an
tacts, Fig. 5, serve to selectively connect the
four receiving antenna circuits on the airplane
efficient low capacity signal distributor particu
to an amplifier, Fig. 4. The upper four contact
larly adapted for use in association with the re
pairs I, 2, 3, and 4, which for convenience will
ceiving circuits on intercepter airplanes provided
hereinafter be called the upper deck contacts,
with equipment to transmit radio signals which
serve to connect the output of the amplifier to
are reflected back from other airplanes to the 10 a suitable indicating device, this connection be
intercepter planes and thus furnish information
ing made selectively and synchronously with the
as to the location of such airplanes. The device,
lower deck contacts. The lower deck contacts
however, is of general application.
are closed shortly before the upper deck contacts,
A feature of the invention is the provision
Fig. 5, and the lower deck contacts are opened
of means for preventing chatter of the contact
shortly after the upper deck contacts have
springs of the signal distributor, which springs
opened. When so operated, noise in the output
are rapidly actuated to make and break the
circuit, which otherwise would be caused by
radio signal receiving circuit.
switching the antenna circuits in and out, is pre
Another feature is the provision of means for
vented from reaching the indicating equipment,
permitting adjustment of the contacts Without 20 since due to this arrangement the indicating
the necessity of dismantling the device.
circuits are not connected to the amplifier when
Other features will appear from the detailed
the antenna circuits are being connected and
description and the appended claims.
In the drawings:
The specific construction and arrangement of
- Fig. 1 is a plan view of the device;
25 the two decks of contacts I, 2, 3, 4 by means of
Fig. 2 is a side View partially in section;
which we have succeeded in eliminating contact
Fig. 3 is a sectional View on line 3-3 of Fig. 2;
chatter will now be described.
Fig. 4 illustrates a circuit arrangement with
The four socket- assemblies I5, I6, I1, and I8,
which the switch may be used; and
Fig. 1 on the upper housing which support the
Fig. '5 is a view to show the relative closures 30 Contact springs I9, 20, 2I, and 22 are similar co
and openings of two sets of contacts in the cir
axial conductor sockets. The four socket as
cuit arrangement.
semblies on the lower housing are similar. Re
Referring now to the drawings, Fig. 2, l0 and
ferring, for example, to'socket I8 of the upper
ll indicate a pairof housings, I0 indicating the
housing shown in detail in Fig. 3, this socket com
upper housing and II indicating the lower hous 35 prises a metal sleeve member 23 containing two
ing. This pair of housings or casings is secured
insulating washers 24, 25, which support a stud
together by clamps I2. These casings house two
26 having a slot into which the contact spring
sets of similar equipment; that is, each housing
22 of contact 4 which may be of Phosphor bronze,
contains four pairs of contacts, the four pairs in
is forced and anchored by rivets. Each spring
the upper housing I0 being indicated by the 40 has its free end looped back on itself and riveted
numerals I, 2, 3 and 4, Figs. 1 and 3. The hous
to the body portion of the spring as shown. It
ings also contain other equipment for performing
is essential that these loops be formed substan
the necessary operations to open and close these
tially as shown, that is, that the side s be
contacts as required to receive the radio im
straight in order to give maximum stiffness to
pulses. Of the four pairs of similar contacts I, 45 the structure. We discovered that this is the
2, 3, and 4 in the lower housing II, only two can
construction which eliminates chatter. If the
be seen in the figures, Fig. 2. These two are in
side s is not straight the spring chatters when
dicated by the numbers I and 2. These two sets
rapidly actuated by the sleeve I3. By having the
or decks of four pairs of contacts as they will
side s straight, a condition is approached, due to
hereinafter be called, are rapidly actuated by 50 not working the member in bending but in com
a sleeve member I3, Fig. 2, preferably of hard
pression, that maximum stiffness or rigidity is
rubber, which is eccentrically mounted with re
attained. We prefer to so shape the spring as
spect to- the shaft assembly 28, 31. This sleeve
to have as nearly as possible three straight sides
is driven by an electric motor mounted in casing
with sharp radii, that is, to approach a rectangu
I4, as will be later described in detail. The leads 55 lar form. We discovered that no chatter occurs
on the make or break of springs constructed and
mounted in this manner even at high speeds oi
rotation of the sleeve I3 which actuates the
four sets oi contacts of each deck. Although the
tors associated with the lower deck contacts are
a part of the four input circuits from the :four
antennas respectively.
As shown in Figs. l, 2 and 4, a similar arrange
shaft of motor I4, through the coupling 21, drives Cl ment is provided for the output circuits from the
arnpliiier, the four central coaxial conductors
the shaft- 28 at a high rate of speed, for example
C101, C202, C303, 04C4 shown structurally in Fig.
1,800 revolutions per minute, the sleeve I3 itself
l, being associated with the upper deck contacts.
which actually engages the looped portions of the
As shown in Fig. 4, the four input central co
springs of the upper and lower contact sets
actually rotates very slowly in the opposite direc
axial conductors C101, C202, C303 and 04C4 asso
tion on its ball bearing mounting, and effects the
ciated with the lower deck contacts I, 2, 3, 4 are
make and break of the contacts I, 2, 3, 4 by a
successively connected by said contacts I, 2, 3, 4
reciprocating motion due to the following con
to conductor ‘Il’ and thence to the amplifier.
struction: A shaft 35i of hard rubber carries the
The output circuit of the amplifier, connected to
sleeve i3 also of hard rubber. Ball bearings 3l,
conductor 1I, is successively connected by con
32 are provided, their outer races secured to the
tacts i, 2, 3, ‘i of the upper deck to the four cen
sleeve I3 and their inner races to the shaft 38.
tral coaxial conductors C101, C202, C303, 04C4 and
The ends of shaft 3i) fit into eccentrically lo
thence to the indicating devices.
cated apertures in members 33, 34. The lower
When it is desired to have access to the equip
member 33 is integral with shaft 28. Inter 20 ment in the upper housing Ill, it is merely neces
mediate shaft 28 and member 33 is a ball bearing
sary to remove the screws E!! which secure the
35 mounted in a bearing plate 36. The upper
cover 52 to the upper housing. When it is de
member 34 is integral with a member 31 which
sired to have access to the equipment in the lower
has a ball bearing 33 in bearing plate 39. Since
housing, it is merely necessary to remove screws
-the shaiît 2B and upper bearing shaft 3'! are
such as 53, which secure the upper and lower
central and the apertures for shaft 3B are ec
centric, it will be evident that the sleeve or cam
i3 has a reciprocating motion, as pointed out
housings to the mounting assembly plate 55 and
elevate the entire unit, the shaft 28 being thus
removed from the hose coupling 21,
above, which results in four makes and breaks
oi the upper and lower deck contacts for each
As described. the shaft assembly which carries
the eccentrically mounted contact actuator con
revolution of the shaft 23 which is driven by the
We also provide an arrangement whereby the
closed period of each contact can be adjusted in
dependently from outside the casing even when
sists oi a shaft 30 0i hard rubber, the sleeve or
the signal distributor is running, which facili
tates adjustment operations. In the signal dis
tributor the contacts are all normally closed.
The contact force may be deñned as the minimum
contact actuator i3 of hard rubber, the ball bear
ings Ei,
for the sleeve, and a pair of members
S3, 34 which have the oiî~center apertures for the
shaft Sil. The members 32, 34 are provided with
counterbalancing weights to prevent vibration;
that is, to balance the rotating structure. This
shaft assembly is cheap to manufacture and eili
cient in operation.
force required to open the closed contacts when 40
The base coupling shown is of soft gum vul
there is clearance between -the contact springs
canized rubber and eliminates critical adiust~
and the sleeve or cam i3. The arrangement for
ments and reduces vibration.
adjusting the upper deck contacts can be best
What is claimed is:
seen in Fig. 2. A similar arrangement is pro
l. ln a signal distributor, a ser; .‘ of stationary;
vided ior the lower set. Each housing ID and I I
contacts, a series of movable contacts engaging
contains a phenol `libre insulating disc 56, Fig. 2,
raid stationary contacts, each of said movable
each disc is secured a plate 44 of Phosphor
contacts being in the vform of a resilient spring
bronce secured to said disc by screws. The
anchored at one end and havin‘r its [ree end
screws 51 for the upper plate 44 may be seen
looped back on itself and ancho-red to the body
in Fig. 3. The plate 44 carries the upper four 50 portion @i the spring and
contact actuating
contact studs, which may be of brass, with which
member adapted to»
said loops in succes~
the loops of contact springs I9, 2D, 2|, 22, Fig. 3,
sion to force them out of Contact with the re
respectively, normally engage. Four hexagonal
spective stationary contacts.
socket set screws 40, 4I, 42, 43, Fig. 3, mounted
2. In a signal distributor, a series of Contact
in tapped holes in the ends of arms 45, 46, 41, 55 studs arranger'. in a circle, a series of movable
and »i8 are accessible through holes 50, Fig. 2,
contact members in the form of resilient springe,
in the upper housing I0.
These screws bear
anchored at one end and having loops at the
other end normally engaging said contact studs,
in and out by a suitable tool inserted in. the sock
and a member mounted eccentrically and adapted
ets through the openings in the housing Il! the 60 to open said contacts in succession by forcing said
radial positions of the stud contacts may be
loops out of contact with said studs.
-~ Tin a signal distributor, a series of contact
against the body of plate 44. By turning them
A precisely similar arrangement is provided for
, a series of movable spring contact members
adjusting the contacts I, 2, 3, 4, in the lower
normally engaging said studs, s id members being`
housing II. The holes in the lower housing II 65 anchored at
and having loops at their
are designated 50'.
As shown schematically in Fig. 4, the four an
tennas hereinbefore mentioned are connected to
the central coaxial conductors associated with the
lower deck contacts two of which conductors are 70
shown structurally in Fig. 2 and designated C101
and C303. The other two diametrically opposite
other ends, each. loop having a number of sub~
stantiaily straight sides, and means for succes
sively forcing said members out of contact with
said studs.
4. In a signal distributor, a series ol’ contact
studs, a serios of movable contact members in
the i'orm of flat springs anchored at one end and
having their free ends bent back ou themselves
and secured to the body portion of the spring to
central coaxial conductors 02C2 and C40“1 asso
elated with the lower deck contacts cannot be
seen in Fig. 2. The four central coaxial conduc 75 form loops normally engaging said studs,` the por
tions of the loops adjacent the secured ends being
contact members of resilient spring metal an
chored at one end and at their other ends being
formed in substantially rectangular loops which
5. In a signal distributor, a series of contact
encircle and engage said studs, and an actuating
studs, a series of movable contact members in
the form of flat springs having their free ends 5 member to successively force said loops out of
bent back and anchored to the body portions of
contact with said studs.
substantially straight,
the springs to provide a substantially rectangu
lar loop, and means for actuating said members
to force said loops out of contact with said studs.
6. In a signal distributor, a series of contact 10
studs arranged in a circle, a series of movable
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