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Патент USA US2411013

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ROTARY SELECTOR SWITCH
Filed May 24, 1944
2 Sheets-Sheet 1
A
HMV Riom@
Nov. 12; 1946.
H, R, WARNK'E
2,411,013
ROTARY SELECTOR SWI TCH
Filed May 24, 1944
2 Sheets-Shee’c 2
Patented Nov. 12,1946
2,411,013
UNITED STATES PATENT C‘FFICE
2,411,013
ROTARY SELECTOR SWITCH
Herbert R. Warnke, East Orange, N. J., assignor
to United States Instrument Corporation, East
Orange, N. J., a corporation of New Jersey
Application May 24, 1944, Serial No. 537,088
8 Claims. (Cl. 200-11)
2
This invention relates to electrical switches
and more particularly to a multi-position selec
Figure 3 is a sectional View on line 3-3 of Fig
ure 1;
Figure 4 is a sectional view on line 4_4 of Fig
tor switch for use in inter-communication sys
tems, signal systems and thelike where a com
ure l;
pact selector switch enabling connection with
Figure 5 is a View similar to Figure l but with
i all of the individual terminals except one omit
one of a multiplicity of circuits is desired.
It is the general object of the present invention
to provide a rotary selector switch of a compact
ted for clarity, and with the auxiliary Contact
arm broken away to expose the main contact
arm;
design having low contact resistance, large cur
rent capacity, rugged construction,'and long life. 10
More particularly, it is an object of the inven
tion to provide a rotary selector switch having
Figures 6, 7, 8, and 9 are detail views illustrat
" ing, in plan, the auxiliary contact arm, the main
contact arm, the common terminal, and the con
tact support disk, respectively;
one or more banks or decks oi terminals, the ter
minals of each bank being arranged in circular
Figure 10 is a rear elevation of the base plate
spaced relationship, and having a common cen 15 illustrating the switch indexing means seen in
’ side view in Figure 2; and
tral terminal and a rotating contact arm with
means thereon for maintaining constant sliding
Figure 11 is a sectional view on line II-II of
Figure 10.
engagement with the common terminal and
other means thereon for successively engaging
In order to facilitate an understanding of the
the individual terminals as the contact arm is 20 invention, reference is made to the embodiment
thereof shown in the accompanying drawings,
rotated. A particular feature of the invention
and detailed descriptive language is employed.
lies in the provision of a solid silver contact mem
ber, carried on the afore-mentioned contact arm,
which bridges the space between the annular
common terminal and the individual terminals,
serving as a direct and short path of high cur
25
rent carrying capacity.
It will nevertheless be understood that no limita
tion of the invention is thereby intended and
that various changes and alterations are contem
plated such as would ordinarily occur to one
skilled in the art to which the invention relates.
Referring now to Figures l, 2, and 3, it will be
Another feature of the invention lies in the
seen that the switch comprises generally a base
provision of an auxiliary contact arm, electrical
ly connected to the iirst Contact arm and also 30 plate I [l in which a shaft I I is rotatably mounted
by means of a bushing I2, a handle I3 being pro
adapted to engage the individual terminals suc
cessively, providing a second current path be
vided for turning the shaft II, and one or more
tween the common terminals and the individual
(in the present case, two) generally annular ter
minal supports i4 of suitable rigid insulating
terminals. ït is also a feature of the invention
that the several sliding contact members are of 35 material, such as Bakelite, each of which is pro
solid coin silver, providing high current-carrying
vided with a plurality of terminals I5, which
capacity, low contact -resistan-ce and long life.
may be of bronze coated with silver. The ter
minals I5 may be secured to the supports I4 by
The contact arms are of a metal possessing good
any suitable means, as for example by hollow riv
resilience and satisfactory conductance, they are
adjusted in such a way as to maintain a light but
ets IE. The outer ends of the terminals I5 are
40
constant spring pressure forcing the silver con
inclined at an obtuse angle to the plane of the
tact members into ñrm engagement with the
support and are apertured to facilitate the secur
contact portions of the respective terminals, the
ing of conductors thereto. The inner ends of the
adjustment being such that the resilience of the
terminals I5 lie iiat against the adjacent surface
contact arms will serve to compensate for any 45 of the support I4 and serve as contact portions
wear of the contact members or terminals.
of the respective terminals, for engagement with
Other and further features and objects of the
invention will be apparent from the description
which follows, read in connection with the ac
the contact means to be described. The supports
ill are maintained in spaced relationship by
companying drawings, in which:
means of the bolts I'I and spacers I8.
'
That portion of the shaft I I which lies inwardly
Figure l is a rear elevation of a switch con.
of the base plate I0 is flattened as at I9 and car
structed in accordance with the present inven
ries the indexing disk 20 and the rotating contact
tion;
supports 2|, which latter are comprised of disks
Figure 2 is a side elevation of the switch
of insulating material, such as Bakelite, of sub
shown in Figure 1;
.
.
,‘
55 stantially the diameter of the central openings in
50
2,411,013
3
the terminal supports U3. As best seen in Figure
4 a common terminal 22, preferably of bronze,
annular in form, is secured to the terminal sup
port lêi surrounding and partially overlying the
central opening of the latter andthe contact sup 5
4
nism just described, when the handle I3 is
grasped and the shaft turned to a selected posi
tion, the disk 20 will be rotated, each successive
tooth passing under the rollers 33 forcing the le
vers 3l outwardly against the pressure of the
springs 3d, and each successive valley passing un
port disk 2l which rotates within said central
opening. The common terminal 22 is provided
der the rollers 33 permitting the levers to swing
with an extension 22’ (Figures l and 3) for con
inwardly again. Thus when the selected position
nection to a conductor.
is reached, the rollers 33 are firmly seated in the
The main contact arm 23, which is shown in de 10 ,corresponding valley of the disk Zû and the switch
tail in Figure 7, is mounted on .the contact sup
is firmly maintained in the selected position un
port 2|, and spaced therefrom, by rivets 24, andv
til positively actuated.
In the illustrated embodiment, the switch of the
cured thereto in any suitable manner. In the il
present invention is especially adapted for an in
lustrated embodiment the contact members 25 15 tercommunication or signalling system in which
carries two sliding contact members 25 and 26, se
and Zâ are solid coin silver and are provided on
a master station is to be selectively connected
their upper side with integral bosses 25', 26", ex
tending through apertures in the material of the
with any one of sixteen subordinate stations by
major axis of the contact arm whereby they wipe
the contact surfaces of the respective terminals
ber in order to meet the particular purpose at
hand.
means of a two-wire circuit. However, switches
contact arm 23, and upset or peened to secure
constructed in accordance with the invention may
the contact members to the arm. It will be noted 20 be adapted to a wide variety of useful purposes
that the downwardly projecting portions of the
and the number of decks or banks of individual
contact members 25 and 26 are inclined to the
terminals may be multiplied to any desired num
over larger areas, reducing wear and at the same
From the foregoing description it will be appar
time providing a self-cleaning feature. The con 25 ent that the objects enumerated above are
tact member 2E has two such downwardly pro
achieved by the invention, and a compact, rugged,
jecting portions, one at each end, for engagement
and eiiicient all-purpose rotary selector switch is
provided.
with the common terminal 22 and individual ter
minals l5, respectively, while the contact mem 30 - Having thus described the invention, what is
ber 25 also engages the common terminal 22, but
claimed as new and desired to be secured by Let
not the individual terminals.
ters Patent is:
A second or auxiliary contact arm 2l, shown in
1. In a multi-position switch, a base plate, a
detail in Figure 6 overlies and is secured to the
plurality of generally annular terminal plates
contact arm 23, being secured by the same rivets
supported from said base plate in spaced, aligned
24 which fasten the latter to the support member
relation, a plurality of .terminal members sup
2 If, and is thus in electrical contact with contact
ported in circular, spaced relation on each said
arm 23. The auxiliary contact arm 2l carries a
terminal plate, each said terminal member hav
contact member 2S, which is secured to a down
ing -a contact portion, a shaft rotatably mount
turned iiange 25 of the contact arm by means of
ed in said base plate and extending through the
integral bosses 3S as described above. The con
central openings of said terminal platesa, plu
tact member 28, like the others, is inclined to the
axis of the contact arm, and is adapted to engage
only the individual terminals I5, providing an al
rality of contact supports carried by said shaft,
one said contact support being substantially in
the plane of each said terminal plate, a contact
ternate current path between contact arm 23 and 45 arm mounted Ion each Said contact support, a
the terminals l5. Thus in all there are two sil
common terminal mounted on each said terminal
ver contact members engaging .the common ter
plate and having an annular contact portion sur
minal 22, and two engaging the individual ter
rounding the central opening therein, contact
minals, the latter two engaging the same individ
means carried on each said contact arm for slid
ual terminal at any given time. Furthermore, 50 ably engaging the contact portion of the adjacent
the bridge-like contact member 25 provides a
.common terminal, and Contact means carried
short and direct path of high current-carrying
on each said contact arm for successively engag
capacity between the common terminal and the
ing the contact portions of the .adjacent terminal
individual terminals.
’
members as said shaft is rotated.
The contact arms 23 and 2i are of metal pos
55 2. In a multi-position switch, a base plate, a
sessing good resilience and satisfactory current
carrying capacity, for example beryllium copper,
and are adjusted to exert a slight constant pres
plurality of generally annular terminal plates
supported from said base plate in spaced, aligned
relation, a plurality of terminal members sup
sure upon the contact members forcing them into
ported in circular, spaced relation on each said
firm engagement with the respective terminals. 60 terminal plate, each said terminal member hav
Due to the length and ñexibility of «the contact
ing a contact portion, a shaft rotatably mounted
arms, this spring pressure, though slight, will take
`in said base plate and extending .through the
up any wear to which the contact surfaces may
central openings of said terminal plates, a plu
be subject during the lifetime of the switch.
rality of contact supports carried by said shaft,
'Ilheindexing mechanism, best seen in Figure
one said contact support being substantially in
10, comprises the toothed disk 2li, secured on the
the plane of each said terminal plate, a contact
iiattened portion I9 of the shaft l l, levers 3| piv
arm mounted on each said contact support, a
oted as at 32 to the plate H3, cam follower rollers
common terminal mounted on each said terminal
33 carried by the levers 3 i, and tension springs 34
plate and having .an annular contact portion sur
secured between the free ends of the levers 3l and
rounding the central opening therein, contact
studs 35 carried by the base plate i0. The val
means carried on each said contact arm for slid
leys formed in the periphery of the disk 20 corre
ably engaging the contact portion of .the adja
spond in number and spacing to the terminals I5v
cent common terminal, and contact means car
of. thefrespective terminal supports. It will be
ried on each said contact arm for successively
readily understood that by virtue of the mecha 75 engaging the contact portions of the adjacent
2,411,013
5
6
terminal members .as said shaft is rotated, said
last contact means being an integral bridge-like
member having a portion »adapted to slidably en
gage the contact portion of the adjacent common
terminal in all positions of the contact arm,
thereby providing a direct and short currentJ path
between said common terminal and said terminal
members.
3. In a multi~position switch, a base plate, a
mounted on each said contact support, a common
terminal mounted on each said terminal plate
and having an annular contact portion surround
ing the central opening therein, contact means
carried on each said Contact arm for slidably en
gaging the contact portion of the adjacent com
mon terminal, con-tact means carried on each
said contact arm for successively engaging the
contact portions of the adjacent terminal mem
plurality of generally annular terminal plates 10 bers as said shaft is rotated, and means for in
dexing said shaft at a plurality of positions cor~
supported from said base plate in spaced, aligned
responding to said terminal members.
relation, a plurality of terminal members support
5. In a rotary switch according .to claim 1, an
ed in circular, spaced relation on each said ter
auxiliary contact arm carried on each said con
minal plate, each said terminal member having
a contact portion, a shaft rotatably mounted in 15 tact support and electrically connected to the said
said base plate and extending through the cen
contact arm thereon, and contact means on each
said auxiliary contact arm for successively en
tral openings of said terminal plates, a plurality
gaging said adjacent terminal members, thereby
of contact supports carried by said shaft, one
said contact support being substantially in the
providing a second current path between said
contact arm and said terminal members.
plane of each said terminal plate, a contact arm
6. In a rotary switch -according to claim l, an
mounted on each said contact support, a com
mon terminal mounted on each said terminal
plate and having an annular contact portion sur
rounding the central opening therein, .contact
means carried on each said contact arm for slid
auxiliary contact arm carried on each said con
- tact support and electrically connected to the said
contact arm thereon, and contact means on each
said auxiliary contact arm for successively en
ably engaging the contact portion of the adjacent
gaging said adjacent terminal members, thereby
common terminal, and contact means carried
on each said contact arm for successively engag
providing a second current path between said ,
ing the contact portions of the adjacent terminal
contact arm and said terminal members, said
last means being of solid coin silver.
7. A rotary switch according to claim 4, said
members as said shaft is rotated, each said con 30
indexing means comprising a toothed disk mount
tact means being of solid coin silver.
4. In a multi-position switch, a base plate, a
ed on and rotatable with said shaft, a lever piv
otally mounted on said base plate adjacent said
plurality of generally annular terminal plates
supported from said base plate in spaced, aligned
disk, a cam follower carried by said lever and
adapted to engage the toothed periphery of said
relation, a plurality of terminal members sup
disk, and resilient means acting on said lever for
ported in circular, spaced relation on each said
maintaining said cam follower in engagement
terminal plate, each said terminal member hav
ing a contact portion, a shaft rotatably mounted
with sai-d disk.
in said base plate and extending through the cen
8. A switch as deñned in claim l, each said
contact arm being of metal possessing good resil
tral openings of said terminal plates, a plurality
ience and satisfactory electrical conductance, and
of contact supports carried by said shaft, one
said contact support being substanti-ally in the
each said contact means being of solid coin silver.
plane of each said terminal plate, a contact arm
HERBERT R. WARNKE.
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