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Jan. 14, 1947.
W. B.~-COON
ELECTRIC SWITCH
Filed June 2, 1945
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Jan. 14, 1947.
w. B. coON
2,414,191
ELECTRIC SWITCH
/Filed June »2, 1945
2 Sheets-Sheet 2
Patented Jan. 14, 1947
UNITED STATES PATENT ÜFFîCE.2,414,191
ELECTRIC SWITCH
Wiliiam E. Coon, Chicago, Iii., assigner to
Simpson Electric Company, Chicago, Iii., a cor
poration of Iliinois
¿application .inne 2, 1945, Serial No. 597,240
ll. Claims.
1
(Cl. 20D-6)
2
The present invention relates to electric
switches and is particularly concerned with elec
tric switches adapted to be used for effecting the
switching necessary to connect in circuit the
proper instruments, sockets, etc., in a tube tester.
Referring to the drawings of which there are
two sheets:
Figure l is a fragmentary sectional view of a
panel equipped with a plurality of switches con
One of the objects of the invention is the pro
vision of an improved electric switch which is
very compact, which occupies a minimum amount
of space, and which is adapted to be manufac
tured at a very low cost.
Another object of the invention is the pro
vision of improved electric switches of the class
described which have a special type of actuating
and indicating member which is adapted to pro
ject from a panel to permit the actuation of the 15
switch and to indicate its position at all times.
Another object of the invention is the provision
structed according to the invention and adapted
to be returned to initial position by a single ac
tuator;
Fig. 2 is a fragmentary front elevational view
of the panel with the switch structures shown in
dotted lines;
Fig. 3 is a side elevational view of a switch unit
embodying the invention with certain parts
shown in section, taken on the plane of the line
3-3 of Fig. 8, looking in the direction of the ar
rows;
Fig. 4 is a full size side elevational view of the
switch;
of an improved switch structure of the class de
Fig. 5 is a similar view showing the switch in
scribed which has a quick make and quick break
cluding two banks of contacts;
and which has a wiping action between the con 20
Fig. 6 is a sectional view taken on the plane of
tacts of the switch so that the circuits are made
the line 6_5 of Fig. 3 looking in the direction
of the arrows;
and broken with a minimum amount of arcing
and so that the Contact resistance is reduced to
Fig. 7 is a side elevational view of the switch
a minimum.
of Fig. 3 shown on a scale corresponding to twice
Although the present switches are particularly 25 the size of the switch;
adapted to be advantageous for certain uses men
Fig. 8 is a similar side elevational view of the
other side 0i the switch of Fig. 7;
tioned above, I desire it to be understood that
Fig. 9 is an exploded view showing the various
the switches are also of general application and
parts of the rotating contact member prior to
may lbe used for many other purposes.
Another object 0f the invention is the provision 30 their assembly;
Fig. 10 is a plan view of one of the contacts
of an improved electric switch of the class de
carried by their rotatable contact member;
scribed having a snap action and means for hold
Fig. 11 is a fragmentary sectional view of the
ing the switch in any of its actuated positions but
switch taken on the plane of the line Il-l l of
which isalso adapted to be actuated in common
with a plurality of similar switches by a single 35 Fig. 8 looking in the direction of the arrows;
Fig. l2 is a fragmentary view in perspective
actuating device so that all of the switches may
showing the structure of one of the frame mem
be simultaneously returned to their initial po
bers; and
~
sition.
Fig. 13 is another fragmentary view in per
Another object of the invention is the pro
40 spective showing the structure of the other of the
vision of an improved switch structure which is
frame members.
adapted to be embodied in double throw or mul
Referring to Figs. 3, 7 and 8, 20 indicates in
tiple switches and which may include as many
its entirety one 0f the switch units embodying the
gangs as desired on a single elongated shaft.
Another object of the invention is the provision 45 invention, a plurality of which are shown in Fig. 1.
The switch unit 23 is provided with a supporting
of an improved switch structure having an im
frame which may consist of a pair of frame mem
proved actuating member and improved indicia
bers 2i, 22 of metal. For example, frame mem
whereby the switch has a plurality of diiierent
ber
2l consists of a strip of sheet metal having
positions but only one of the indicia correspond
a dat body portion 23 which is provided at each
ing to its present position is visible` at any time. 50 end with a laterally turned end ñange 24 and
Other objects and advantages of the invention
will be apparent from the: following description
and the accompanying drawings, in which simi
lar characters of' reference indicate similar parts
throughout the several views. -
. »
. .
an inwardly turned attaching ñange 25 carried
by the end ñange 24.
The attaching ñanges are located at right an
gles to the body portion 23 and are provided with
55 threaded ~bores 26 for receiving the screw bolts 21
2,414,191
3
4
gaged by a common actuator which will be fur
ther described in respect to Fig. l.
Spring ¿is urges the ball :i1 toward the left but
preferably formed with rectangular slots 29 in
permits the ball to be cammed out of the sockets
their edges, leaving a pair of outwardly project
¿ii-t6 when the rotatable member 35 is turned.
ing lugs 30 for engagement with the other frame
The actuating disc S5 includes a circular _body
member 22.
portion 52 in the form of a plate of molded in
The frame member 22 may consist of a
sulation which is provided with a centrally lo
straight piece of sheet metal each end of which
cated cylindrical hub 53 and a spring housing
is formed with the inwardly extending rectangu
lar slots 3l adjacent the end, of such a size as 10 flange 5t extending in the same direction as the
-hub and located near the periphery of the disc
to receive the lugs 3l) and the body portion 32 be
52. The edge 55 of the disc 52 may be rounded
tween the slots 3l is Aof sufficient width to be re
and is preferably knurled as shown for conven
ceived in the slot 2S of the end flange 24. Thus,
ient engagement with the ñngers which actuate
when these frame members 2| and 22 are as
the
disc by frictional contact.
15
sembled as shown in Fig. 3, the ends of the lugs
The cylindrical housing flange 52 may be pro
3E may be riveted over slightly to hold the frame
vided on its cylindrical periphery with numerical
in assembled relation.
indicia indicated at 55 (Fig. 4) showing the po
The two frame members 2| and 22 are pro
sition of the switch at any time. The axial length
vided with a pair of aligned cylindrical bores 33,
34 for receiving the stub shaft 35 which carries 20 of the hub 53 and housing ñange 54 is such that
rotatable actuating member 36 may be received
the rotating actuating disc 36. The length of
between the frame members 2l and 22 where it
the stub shaft 35 depends upon the number of
is rotatably supported by the shaft 35 engaging
banks of contacts that are intended to be em
in
bores 33, 34,
ployed upon each unit. As shown in Fig, 4, the
The space between the hub 53 and housing
unit may have one bank. of contacts, or, as shown
flange 5G houses a spiral ribbon spring 51 which
in Fig. 5, two banks, or any suitable number of
is used to urge the actuating member 36 toward
banks of contacts may be employed, depending on
its initial position. The frame member 2l car
(Fig. l) by means of which the switch units are
attached tc a panel 28. The end flanges 2è are
-
the number of contacts which it is desired to ac
tuate simultaneously.
ries a metal pin 58 (Fig. 3) riveted in a bore and
'
projecting into a hook 5B which is formed by `
The actuating disc 36 preferably consists of a 30 curling one end of the spring into partially cylin
molded member made of a phenolic condensa
tion` compound which is molded about the shaft
35 and about anchoring formations carried by a
metal disc 31 that is located in the right face of
the actuating disc 36. Metal disc 31 may be se
cured in place by a screw bolt 38 as shown in
Fig. 3 or it may have a plurality of anchoring
drical form. The other end of the spring has a
cylindrical formation 66 which may be slid ax
ially into a cylindrical bore 6| that is formed in
the housing flange 54, thus anchoring this end
of the spring to the actuating member 36. The
strength of the spiral spring 51 is sufficient to
rotate the member A35 and its rotatable switch
members cut out of its periphery and bent in
members when the pressure of spring 49 is re
ward to be anchored in the molded insulation of 40 leased, but as long as spring 4S presses the ball
the actuating disc 36.
The metal plate 31 serves as a part of the snap
enough to alter the position of the rotatable
mechanism and for retaining the switch in its
member 35.
actuated positions and this plate is provided with
In addition to the sockets iii-25 for the ball
a central aperture 39 that registers with the 45 E11, the plate 31 preferably has an arcuate slot G2
aperture 4U in the actuating disc 36.
which is of suflicient length to determine the
In addition to this, the metal disc 31 has a
range of movement of the rotatable member 35.
plurality of circular apertures 4I-46 (Fig. 8)
Slot 62 is located to be engaged by an inwardlyA
which are countersunk at their outer end so as
projecting lug 53 which may form a part of frame
to provide a better socket for a steel ball 41 which 50 member 22 (see Fig. 13), «being bent inwardly
is located to be received in the apertures lil-45.
The ball 41 is carried in a cylindrical bore 43
in the frame member 22, this bore being located
at a suitable rad'usfrom the axis of shaft 35 so
that the ball is adapted to be received in any
from the frame member 22, to extend into the
slot S2. The end Si! of slot G2 determines the
limit of rotation in a clockwise direction of the
rotatable switch and the end 55 of the slot t2
determines the limit of motion in a contrary
of the sockets ¿ll-ß'i carried by the rotatable ac
direction.
tuating member 36. Ball 41 projects from itsV
bore ¿t8 in the frame member 22 to engage the.
metal plate 31 on the left, and on the right hand
side in Fig 3 the ball is engaged by a leaf spring
49 which urges it toward the rotatable actuating
member 36.`
l
The leaf spring 39 may be made of any suita
ble »material such as spring brass or bronze, and
it comprises an elongated strip of this sheet metal
.
In order to reduce the friction between the end
of the insulating hub 53 and the adjacent frame
member 2l, a washer 6‘5 is carried by the shaft
35. The left end of shaft S5 (Fig. 3) is provided
with one or more non-circular portions 61 such
as for example flat surfaces, and the shaft 35 is
adapted to actuate a rotatable switch member 68
for each bank of contacts. In Fig. 5 this flat--
tened portion of the shaft 35 has been extended
far enough to support two such rotatable switch
members 58 and E9.
lThe rotatable switch member 68 is shown with
through Vthis flange and through the frame mem
its parts in exploded form in Fig. 9 'and this
ber 22 tc secure the leaf spring 49 to frame mem
ber 22. The leaf spring extends longitudinally 70 member preferably comprises a disc 1@ of insulat
ing material such as indurated fiber or a phenolic
of the frame member 22 and thus has considera
condensation molding compound.. Disc 1S is pro
ble length so that it need not be bent beyond its
vided with the centrally _located non-circular
elastic limit. Its length is such that it projects
aperture 1 l _which is complementary to the -exter-j>
abovethe end ñange 24 of the switch unit, the
upwardly projecting portion serving to be en 75 nai shape of the shaft 35 at its .flattened por-,-l
having an enlarged attaching ñange 5i! provided
with apertures for receiving the rivets 5I passing
2,414,191.
tionsßß'I‘. The disc T0 is preferably provided with
a plurality of partially` circular apertures 'I2
which are substantially rectangular in shape but
are arranged along the line of a circle, these slots
being adapted to receive the securing members
that are carried by a pair of annular Contact
members 13, M,
(i
construction and these preferably comprise resil
ient sheet metal members which are bent back
upon themselves at the connector portion Sd
which is provided with a T~shaped formation and
with an aperture 95 for receiving a connecting
wire. At an intermediate point each connector
is secured to the arcuate insulating plate 86 (Fig.
Each annular contact member comprises a flat
ll) by a tubular rivet 96 which passes through
sheet metal member in the form of an annulus
both the insulating plate and the contact mem»
and having a plurality, auch as for example four,
ber.
inwardly extending radial tabs 'I5 which are bent
From the tubular rivet 96 each contact extends
in an axial direction, the. axial portion being
radially inward, One is bent upward at 91 and
called a securing tab ‘IS and being provided with
the other is bent downward at 98 to give these
an axially' extending` slot ll, The securing tabs
contact portions a spread. Then the contact por
‘i6 are wide enough and thickv enough to fit in
I tions are bent until theyv extend into engage
the slot ’I2 and theyA are properly located to regis
ment
IBO and
with
eacheach
of the
other
corners
at the
ISI end
is bent
portions
outward
terA with four of these slots.
Thus. the annular contact plates 'I3 and 'I4 may
so that the two legs of each contact engage each
.be secured to the opposite sides of the insulating
other but the corners have a spread for the pur
disc 'IB by passing the securing ta'bs TIB through 201 pose of guiding the contact member 93 carried by
predetermined slots 'I2 and by spreading the ax
annulus 'I3 between them. This spread of the
ially extending slots il. The annular contact
fixed contact portions assures the contact 93 en
members 'I3 and *Ill are of such size that only the
tering between them and wiping across both of
innermost portion of these annular members rests
the legs of each ñxed Contact.
on the faces of the insulating disc ‘lil and thus
Referring now to Figs. 1 and 2, here the panel
the annular members 'i3 and 'I4 project beyond
23 is provided with a plurality of apertures IEiZ,
the edge 'i3 of the insulating disc 1B. Since the
each aperture consisting of an elongated portion
tabs 'I6 may be located in spaced slots 12, the
for exposing the knurled edge 55 of the actuat
two annular members 'I3 and 'Ill may be insulated
incr disc 3b and each aperture also including a
from each other and if desired each of these an
small rectangular portion for exposing an indi
nular members might be used for a contact.
eating numeral on the hub 54. The threaded
However, in the embodiment of Fig. 3 only the
bores 26 in frame member 2i serve to receive the
outermost annular member 'i3 has been used for
l screw bolts 2l which secure the switch units to
a contact while the other annular member ‘It
the rear side of the panel with nothing but the
merely serves as a guide for holding the rotatable 35 edge of the actuating disc and the indicating
switch member 68 upon the shaft 35. This is
numerals exposed on the front side of the panel.
accomplished by means of the switch contact
Allof the upwardly projecting end portions of
bank 'i9 (Fig. 7) which carries a multiplicity of
the leaf springs 49 are located in alignment and
ñxed contacts Bil-25, The contact bank 19 cori
these are adapted to be engaged by metal discs
sists of a plate of insulating material such as a 40 "i3-|05 (Fig. l) carried by a reciprocating actu»
phenolic condensation compound. which is arcu
ating rod I'fllì. rï‘he rod IBS is guided by being
ate in shape, the arcuate portion 85 being sub
slidably mounted in cylindrical apertures in the
stantially concentric but spaced from the rotat
angle brackets IWI-_|539 which are secured to the
able switch member 68.
panel 28 by screw bolts and the discs IGS-HB5 are
At each end the arcuate portion 85 has an enn
located on the left side of each leaf spring 49
largement 8'I provided with apertures for receiv
having reference to Fig. 3.
ing the screw bolts 88 which pass through these
A helical compression spring Il@ is interposed
apertures and are threaded into the frame mem
between the bracket I E8 and a washer I I I on the
ber 2 I. An insulating spacer washer 89 is carried
rod |06, the washer being in engagement with a
by each bolt 88 to space the bank 'I9 properly from 50 transverse pin II 2’. The coil spring H0 urges
the frame member 2i so that the contact annulus
the rod |06 toward the left and urges the discs
'I4 is spaced from frame member 2l.
Adjacent ‘each end of the arcuate member S5
there is also an inwardly extending insulating lug
Bil, 9| which extends radially toward the insulat- ;
ing disc 'I0 and is of suiiicient thickness to haverv
a sliding ñt between the annular members 'I3 and
’i4 at the edge ‘I8 of disc l0. It is these lugs 538,
9| which guide the annular members 'I3 and 'M
of the rotatable switch member 'lil and hold this
switch member on the shaft 35. ' A third such
lug 92 projects radially inward from the arcuate
portion 86 between the annularvcontacts 'i3 and
14.
The annular member 'I3 serves as a continuous
contact for engaging. the fixed contact member
and -the ñxed contact member 85‘ is located
closer to the axis of the shaft 35 so that it will
be in engagement with the annulus 13. The
other fixed contact eil-_84' are. located. at a greater
radius so that they are out of contact with the
annulus 'I3 butare positioned toengage a radially'Y
extending contact portion 93 which is carried by
theannuluszlßfiy.
x .1.
.
'
1
r
-
,
.
e r
.'z. All of the'contactsgßß--Bñ may be identical
'
IUS-|05 out of engagement with the leaf springs
49.
A bracket H3 carried by panel 28 has a bell
crank H4 pivotally mounted by a rivet IIS with
one arm I I6 in position to engage the end of rod
|06. A push button II'I is slidably mounted in
a threaded plug II8 carried by panel 28 and is
confined against outward movement by a trans
verse pin I I 9. A plunger rod I20 of the push but
ton II'I is located to engage the other arm i2I of
the bell crank but a coil spring I22 urges the
push button outward into the position of Fig. l.
In some embodiments of the invention this spring
may be eliminated. as the spring iIIl on the rod
IBS may accomplish the` same purpose..
The operation of the switch units and of. the
bank. of switch units is as follows: Contact 85 is
the common contact which is connected to a
commonv lead that is intended to be controlled
by the switch and connected to any one of the
other contacts Bû-Bll selectively. When the
switch isv inthepositionim~ which contacteer
engages.; Contact ßìiit‘is'on. open circuit with:
respect to the other contacts Ste-84..
2,414,191
8
that they may be placed within the price range
If the finger is then appliedto the knurled>
edge 55V of the rotatable actuating member 36,
of a vast number of users.
>
While I have illustrated a preferred embodi
this will tend to cause this member to rotate and
the steel ball 41 will be cammed out of its ñrst
socket 46 and will ride up over the metal mem
ber 31 against the tension of the leaf spring ¿i9
which holds the ball in the aperture 48. As the
ment of my invention, many modiñcations may
be made without departing from the spirit of the
invention, and I do not wish to be limited to the
precise details of construction set forth, but de
sire to avail myself oi all changes within the
rotatable member 36 moves on farther, the ball
- will drop into the socket 45 and will tend to hold
scope of the appended claims.
v
Having thus described my invention, what I
the rotatable member 36 in this position. In thisï 10
claim as new and desire to secure by Letters
position the movable contact member 93 engages
Patent of the United States is:
'1. A rotatable switch member comprising a
supporting member having a slot, a supporting
The resistance toward movement of a ball out 15 frame carried by said member and having bear
ings for a shaft, a rotatable insulating member
of its socket is such that the spiral spring 5I in
projecting from said slot for engagement by the
the housing 54 of rotatable member 36 cannot
fingers of an operator, an annular contact car
overcome the resistance to movement of the ball
ried by said rotatable shaft and a plurality of
and the switch is held in this position. I-Iow
ever, each time the switch is moved a step farther 20 fixed contacts carried by said frame and insulated
from each other, and a snap retaining means for
away from the contact 85, the spiral spring 5l
holding
the rotatable insulating member in any
is wound up.
of a plurality of different positions, said snap
The rotatable member 36 may be successively
retaining means comprising a ball resiliently
brought into a position in which the steel ball
¿il is retained in sockets 44“, 43, e2, and finally 25 mounted on said frame and adapted to be en~
gaged in any one of a plurality of sockets located
4 I, during which the Contact member 93 will suc~
in said rotatable insulating member, said ball
cessively engage ñxed contacts 83, 82, 8i and
being movable mounted in a bore in said frame
finally 30 and the movable switch member ‘lil
and havin-g resilient means urging it toward
will be retained in any of these positions by the
the contact 84 having been inserted between vthe
portions 99 and H10 of that movable contact as
shown in Fig. 1‘1.
steel ball lil engaging in its socket.
'
Ii the operator Wishes, he may move the switch
backward to any desired position and at any time
the position of the switch Will be indicated by the
numeral which is exposed at the aperture |02.
30
said sockets.
'
2. A rotatable switch member comprising a
supporting member having a slot, a supporting
frame carried by said member and having bear
ings for a shaft, a rotatable insulating member
projecting from said slot for engagement by the
There are some'uses of these switch units in 35
fingers of an operator, an annular contact car
which it is desirable to clear the machine or
ried by said rotatable shaft and a plurality of
tester and move all the switches back tothe
fixed contacts carried by said frame and insu
initial position. In such case the arrangement
lated from each other, and a snap retaining
of Figs. 1 and 2 is of great advantage as it is only
necessary to push the push button Ill to clear 40 means for holding the rotatable insulating mem
ber in any ci a plurality of diñerent positions,
all the switches. This action is as follows:
said
snap retaining means comprising a ball re
Push button Il'l rotates the bell crank l i4
siliently mounted on said frame and adapted
clockwise in Fig. 1. Bell crank il@ moves rod
to be engaged in any one of a plurality of sockets
lofi toward the right against spring Ilû. Discs
located
in said rotatable insulating member, said
Ul
l03--I05 engage the leaf springs 49 of the re
ball being movabley mounted in a bore in said
spective switch units 20, permitting the steel balls
`trame and having resilient means urging it to
4l in each unit to be cammed out of whichever
ward said sockets, said resilient means compris
socket ¿il-d6 the ball happens to be in. Under
ing a leaf spring having a projecting portion to
these conditions the steel ball 41 no longer holds
the rotatable actuating member 35 in a ñxed 50 be engaged for releasing the retaining action of
said ball.
position and the spiral spring 51 in the housing
3. A snap mechanism for retaining a rotatable
5d acts to return the rotatable switch member
switch'member in any position to which it is
'lll to its initial position where the movable con
moved comprising a supporting frame, an insu
tact 93 engages the iixedcontact 35. Thus a
55
lating member rotatably mounted in said frame
mere push on the push button H1 releases all
and being provided in one of its ends with a plu
of the switches to return to their initial position.
rality of sockets arranged in a circle, said frame
In a tube tester this is of marked advantage be
having an aperture adapted to register with any
cause otherwise it would require separate ma
ci said sockets, a retaining ball in said aperture
nipulation of each switch unit by the operator.
The present switches maintain their contacts 60 and adapted to engage in said sockets and a leaf
spring engaging said ball and carried by said
in a bright and low contact resistance condition
frame and projecting beyond the end of said
and they are adapted to be moved to any one of
frame for manipulation to release the ball.
a plurality of positions with a minimum amount4. A snap mechanism for retaining a rotatable
of eiïort. The present switch may be provided
with any number of banks of contacts for simul 55 switch member in any position to which it is
moved comprising a supporting frame, an insu
taneous or successive operation and any number
lating member rotatably mounted in said 'frame'
of unitsv may be mounted on a single panel to be
and being provided in one of its ends with a plu«
releasedand returned to initial position by mere
rality of sockets arranged in a circle, said frame
ly actuating one push button.
The present devices are capable of being man 70 having an aperture adapted to register with any
of said sockets, a retaining ball in said aperture
ufactured very economically and they utilize a
minimum number of separate parts. rI‘hey may
be used for a long period of time without neces'
sity forv repair 'or' replacement _of any ofitheirf
parts and maybe manufactured so econ'oriii'callyA`
and adapted to engage in said’` sockets and a
leaf spring engaging said ball andi carried by said
frame and projecting beyond the erid‘of-s'aid-
75' frame for manipulation- to release the ball, said
9
2,414,191
sockets being formed in a metal plate embedded
10
9. In an electric switch unit, the combination
in said insulating member.
of a supporting frame having a pair of ñxed
5. A snap mechanism for retaining a rotatable
frame members provided with bearings for a
switch member in any position to which it is
shaft, a shaft in said bearings and projecting be
moved comprising a supporting frame, an insu
yond said frame, said shaft having a non-circular
lating member rotatably mounted in said frame
formation at its projecting end, a rotatable in
and being provided in one of its ends with a
sulating member of disc shape carried by said
plurality of sockets arranged in a circle, said
shaft for actuating the shaft, an insulating sup
frame having an aperture adapted to register with
porting plate carried by said frame adjacent the
any of said sockets, a retaining ball in said aper~ 10 projecting end of said shaft and having a plu
ture and adapted to engage in said sockets and a
rality of fixed contacts, an insulating disc car
leaf .spring engaging said ball and carried by
ried by the projecting end of said shaft and ro
said frame and projecting beyond the end of said
tatable with said shaft, a pair of annular metal
frame for manipulation to release the ball, said
members carried by said latter disc and project
sockets being formed in a metal plate embedded 15 ing edgewise therefrom to form a groove and a
in said insulating member, and said metal plate
pair of insulating lugs projecting from said in
being formed with an arcuate slot for receiving a
sulating plate into said groove to hold said lat
lug carried by said frame, said lug and slot serv
ter insulating disc on the projecting portion of
ing as stops to determine the limits of rotative
said shaft, one of said fixed contacts engaging
movement of said insulating member.
20 the annular portion of one of said annular metal
6. A snap mechanism for retaining a rotatable
members, and the other of said fixed contacts
switch member in any position to which it is
being located farther outward radially to engage
moved comprising a supporting frame, an insu
a radially projecting contact member carried by
lating member rotatably mounted in said frame
said latter annular member.
and being provided in one of its ends with a plu 25
10. In an electric switch unit, the combination
rality of sockets arranged in a circle, said frame
of a supporting frame having a pair of fixed
having an aperture adapted to register with any
frame members provided with bearings for a
of said sockets, a retaining ball in said aperture
shaft, a shaft in said bearings and projecting be
and adapted to engage in said sockets and a leaf
yond said frame, said shaft having a non-circular
spring engaging said ball and carried by said 30 formation at its projecting end, a rotatable in
frame and projecting beyond the end of said
sulating member of disc shape carried by said
frame for manipulation to release the ball, said
shaft for actuating the shaft, an insulating sup
insulating member having an axially extending
porting plate carried by said frame adjacent the
hub and an axially extending cylindrical hous
projecting end of said shaft and having a plu
ing and a spiral spring tensioned between said
rality of fixed contacts, an insulating disc carried
insulating member and said frame and located
by the projecting end of said shaft and rotatable
in said housing to return said insulating member
with said shaft, a pair of annular metal mem
to initial position when said ball is released from
bers carried by said latter disc and projecting
pressure by said leaf spring.
edgewise therefrom to form a groove and a pair
7. A switch assembly comprising a plurality of 40 of insulating lugs projecting from sai-d insulating
switch units carried by a panel, each switch unit
plate into said groove to hold said latter insulat
having a disc, the edge of which projects through
ing disc on the projecting portion of said shaft,
said insulating disc carried by said shaft being
provided with a plurality of circular sockets in
a slot in said panel and each switch unit being
provided with a plurality of sockets in said disc
engaged by a spring pressed ball carried by the
one of its faces and a spring pressed ball carried
n by said frame for engaging in any one of said
switch unit frame, spring means for returning
each switch unit to its initial position, movable
sockets to resiliently resist rotative movement of
said latter insulating disc.
contact means actuated by each rotatable disc
and ñxed contacts carried by each switch unit,
11. In an electric switch unit, the combination
a reciprocating plunger rod carried by said panel 50 of a supporting frame having a pair of fixed
and having discs for engaging a leaf spring car
frame members provided with bearings for a
shaft, a shaft in said bearings and projecting be
ried by each switch unit for urging the ball of
yond said frame, said shaft having a non-cir
each switch unit into its sockets, and manual
means for actuating said plunger to relieve all
cular formation at its projecting end, a rotatable
insulating member of disc shape carried by said
of the balls of the switch units from spring pres
shaft for actuating the shaft, an insulating sup
sure and to permit the first-mentioned springs to
porting plate carried by said frame adjacent the
return each switch unit to its initial position.
projecting end of sai-d shaft and having a plu
8. In an electric switch unit, the combination
rality of ñxed contacts, an insulating disc carried
of a supporting frame having a pair of fixed
frame members provided with bearings for a 60 by the projecting end of said shaft and rotatable
with said shaft, a pair of annular metal members
shaft, a shaft in said bearings and projecting
carried by said latter disc and projecting edge
beyond said frame, said shaft having a non-cir
wise therefrom to form a groove and a pair of
cular formation at its projecting end, a rotatable
insulating lugs projecting from said insulating
insulating member of disc shape carried by said
shaft for actuating the shaft, an insulating sup
porting plate carried by said frame adjacent the
plate into said groove to hold said latter insulat
ing disc on the projecting portion of said shaft,
said insulating disc carried by said shaft being
projecting end of said shaft and having a plu
provided with a plurality of circular sockets in
rality of fixed contacts, an insulating disc carried
one of its faces and a spring pressed ball carried
by the projecting end of said shaft and rotatable
with said shaft, a pair of annular metal members 70 by said frame for engaging in any one of said
sockets to resiliently resist rotative movement of
carried by said latter disc and projecting edge
said latter insulating disc, said spring pressed
ball being engaged by a leaf spring carried by said
frame and projecting beyond said frame for
wise therefrom to form a groove and a pair of
insulating lugs projecting from said insulating
plate into said groove to hold said latter insulat
ing disc on the projecting portion of said shaft.
75
manipulation to release the pressure on said ball.
WILLIAM B. COON.
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