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Патент USA US2406818

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Sept. 3, 1946a
G. H. EFÈB
2,405,818
ROTARY SWITCH
Filed May 7, 1.945-
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ROTARY SWITCH
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Patented Sept. 3, 194:6
2,406,818
UNITED STATES PATENT OFFICE
2,406,818
ROTA-RY SWITCH
George H. Erb, South Orange, N. J., assigner to`
Federal Telephone and Radio Corporation,
Newark, N. J., a corporationy ofDelaware
Application May 7, 194.3, Serial No. 485,969
1 Claim'.
(Cl. 204)--6)
1
2
The present invention relates to electrical
switches and more particularly to a multi-posi
tion switch having an indexing mechanism in-=
portion I3 of member I2, and a plurality of rivets
I8 respectively connect these outer contacts It
with exterior terminals I4. Another raised cir
corporated therewith.
cular portion I5 of insulating member I2 spaces
Although indexing vdevices for switches are CF1 and retains in position outer terminals I4.
well known in the> art, it is one purpose of the
On one side of insulating. member 20 is a
present invention to provide an improved assem
raised surface portion 2| shaped so as not to in~
bly inwhich the switch contacts and the index
terfere with the positioning of contacts Bü by
pins 32` (see Fig. 3). A slot in this portion 2l
receives a pin 2'2 which extends through shaft 5,
and is securely positioned thereby. Thus a rota
tion of shaft t will correspondingly rotate insu
ing mechanism are enclosed as a unit within a
housing of relatively smallV size.
It is a further object of the invention to pro
vide an indexing mechanism that will have a
positive action but at the same time can be actu
ated with a minimum of effort.
It is another object of the invention to provide
an indexing mechanism that will maintain the
switch contacts in the position selected regard
lating member 2t! as well as associated inner con
tacts 30.
A front cover i0 for the assembly fits against
insulating member i2 and has a bushing S en
closing shaft 6. This bushinfr may be externally
less of vibration or shocks that may be applied
threaded to permit connection of the switch as
to thev switch housing or to the control structure.
sembly to a suitable mounting. Between bushing
The invention still further contemplates an 20 8` and the raised surface 2'I of insulating member
indexing device that includes interchangeable
2,5 are a washer 28 and a pair of spacers 24
parts, so that by a proper selection of such parts
the indexing mechanism can be made to respond
to operating forces of any desired magnitude.
and 2t.
rI'he extremity of shaft E is formed' with a cup*
shaped opening as» shown in Fig; l, and a tube
Other objects and advantages will be apparent
from the following description of a preferred
form of ther invention and from the- drawings,
in which:
' cradle 313i is> insertably positioned in this open
ing. A'v tubular extending portion 35 of shaft 6 is
formed' axially thereof and passes through an
opening 3l in tube cradle 34 (see Fig. 5). The
Fig. 1 is a sectional View of a switch assembly
extending portion
is peened over to securely
in accordance with the present invention;
30 position on shaft 6 the cradle 3d and the insu
Fig. 2 is a view along 2_2 of Fig. 1;
lating member 20'.
Fig. 3 is a View along 3_3. of Fig. 1, showing
A spring retaining tube 4B is securely attached
the inner rotor assembly;
to tube cradle (iii by means such as soldering,
Fig. 4 isy a view along il-t of Fig~ 1, showing
the tube cradle being shaped to receive the tube
the outer contact assembly;
40 as shown in Fig. 5. A spring 'l2 is compressibly
Fig. 5 is a sectional View of the tube cradle of
positioned in tube 40, and a pair of spring guides
Fig. l.
44 and 45 at the ends of spring 4i! respectively
In Fig. 1 is shown a rotatable shaft 6 on which
Contact an upper ball bearing 4S and a lower ball
is mounted an insulating member Ztl supporting
bearing 43. A rear cover 38 adjoins insulating
a plurality of inner switch contacts 30. A plu
member i2 and with this member and front
rality of rivets 32 respectively position inner con
cover lil form a compact housing unit for the
tacts 30 on insulating member 20, this construc
switch and indexing assembly.
tion being also shown in Fig. 3. Each of these
Rear cover 38 is constructed as best shown in
inner- contacts 30 comprises a pair of flexible
Fig. 2. A recess 41 on the inner surface thereof
spring elements disposed in substantially par
is designed to receive the spring retaining tube
allel relationship and having ears on the outer
corners thereof to facilitate engagement with
stationary outer contacts I5, as will hereinafter
be described.
three niches 49, 50 and 5I shaped to receive the
ball bearing 46 which is partially enclosed within
A ring-shaped insulating member I2 (see also
Fig. 4) supports and positions a plurality of outer
stationary contacts I6, this ring-shaped insulat
ing member I2 forming a part of the assembly
housing, as can be seen from Fig. 1. The outer
contacts I6 are spaced apart by a raised circular
40. In the upper portion of recess 41 are formed
spring retaining tube 40. Ball bearing 48 rides
along the smooth lower surface of recess 4l as
shown. Threaded openings 52 on cover 38, insu~
lating member I2, and the front cover I0, receive
screws (not shown) which when tightened tend
to form a relatively dust-proof enclosure for the
assembly,
2,406,818
4
3
From Figs. 1 and 3 it can be seen that a rota
relationship of the switch contacts I6, 30. Since
tion of the shaft E will rotate the insulating
member 2i) and the inner contacts 3i). These
contacts 30 will then selectively bridge or con~-
it can also be seen from Fig. 1 that the spring
nect the outer contacts i6 (Fig. 4) .
other shock applied longitudinally along the axis
of the shaft will be taken up by the spring con
The present
disclosure is not limited to any combination or
arrangement of circuits, but it will be obvious
that a large number of switching variations
within the scope of the invention can be ob
tained by altering the spacing of the outer con
tacts IB and/or the design of the inner con
tacts 30.
As will be seen from Fig. l, each spring contact
30 is designed as a pair of flexible sections dis
posed iace to face so that an outer contact It
may pass between these sections upon rotation
of shaft
this construction insuring an electri
cal connection between the inner and outer con
tact elements.
The ears on the corners of the
retaining tube 4i) does not directly contact the
inner surface of rear cover 38, any vibration or
tacts 353 and i6 without disturbing their circuit
relationship. since the applied force is at right
angles to their direction of rotation.
It should be noted that due to the relatively
short radius of the indexing mechanism, little
operating force need be applied to the shaft B
to actuate the switch assembly. Furthermore it
will be apparent that by removing the rear cover
38 the ball bearings 46, 48, the spring guides
44, 125, and the spring 42 may be quickly removed
from the tube 42. By selecting a spring having
a different degree of resiliency, the switch assem
bly can be made to respond to any desired oper
inner contacts 3@ are to guide the outer contacts 20 ating force, this change being effected without
disturbing in any way the switch contacts 30,
i6 in passing between the sections of such inner
I6, and without the necessity of breaking the
contacts.
circuit when the spring replacement is made.
ssume now that the indexing mechanism is
While I have described above the principles
in the position shown in Figs. 1 and 2, that is,
or my invention in connection with speciiic ap
with the ball bearing ¿it of spring retaining tube
paratus, it is to be clearly understood that this
blt] in the central niche 5D in recess 4l of rear
description is made only by way of example and
cover
Due to the tension of spring 512, spring
not as a limitation on the scope of my invention
guide ‘iii exerts pressure on bearing ß'iEì to hold
as set forth in the objects of my invention and
bearing ¿it in niche Sii, thus positioning tube 11E!
in place in recess Lil. The resultant pressure of 30 the accompanying claim.
I claim:
spring
in the opposite direction is exerted
In a. compact rotary switch and indexing mech
against spring guide 'l5 and ball bearing lill, but
anism, a housing having a substantially dust
since bearing ¿i8 rides along the smooth lower
proof recess therein, said recess comprising two
surface of recess
no opposition is offered by
portions, one portion being substantially cylin
bearing d8 to a rotation of shaft ii.
drical and containing a plurality of radially pro
When it is desired to actuate the shaft 6 to
another of its contact positions, the angular
movement of tube i@ will force ball bearing 455
against the sloping surface of niche 55, and suf
jecting contacts, and the other portion being sub
stantially the shape of two opposing sectors
tension of spring ¿52. Thus a positive indexing
operation results, and since the spring ¿i2 permits
mechanism within said other dual-sector-shaped
wherein the arcuate surface of one sector is
ficient pressure will result in a depressing of ball 40 smooth and the surface of the other sector con
tains a plurality of spaced-apart axial grooves, a
bearing Lie into tube do for a suflicient distance
rotatable sl'iait supported by said housing co
to permit the upper surface of bearing ¿i6 to clear
the sharp edge between niches 5i] and El (or 43,
axial with said recess, one or more conducting
depending on the direction of rotation of shaft
elements carried by said shaft for bridging adja
f5). As soon as the bearing @il enters niche 5| 45 cent radially projecting contacts in said cylin
it will center the tube 40 in such niche due to the
drical portion of said recess, and
indexing
the tube
to have a limited movement trans
versely of shaft f5 without the ball bearing 46
being displaced from the niches 4S, 50 and 5I,
ie disclosed structure will resist a shock or
vibration applied to the shaft or housing in a
direction perpendicular to the axis of the shaft
and having a tendencyto disturb the selected
recess portion comprising a transverse bearing
holder mounted on the said shaft and a pair of
bearings, one of said bearings directly engaging
said axially grooved arcuate surface, and the
other of said bearings directly engaging 'said
smooth arcuate surface.
GEORGE H. ERB.
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