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Патент USA US3076893

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Feb. 5, 1963
w. G. BURT, JR
3,076,883
SWITCHES
Filed Jan. 13, 1961
5 Sheets-Sheet 1
Feb. 5, 1963
W. G. BURT, JR
3,076,883
SWITCHES
Filed Jan. 15, 1961
5 Sheets-Sheet 2
Feb. 5, 1963
w. e. BURT, JR
3,076,883
SWITCHES
Filed Jan. 15, 1961
3 Sheets-Sheet 3
United States Patent 0
1
3,ti76,8ti3
lii’atenteti Feb. 5, 1%5
2
SWETCHES
William G. Burt, in, Weston, Mass, assignor to Gener?
Qommunieation Qompany, Boston, Mass, a corpora
tion of Massachusetts
Filed .l’an. 13, 1961, Ser. No. 82,618
6 Claims. (ill. Mill-153)
1
FIG. 4 is a sectional view taken along line 4—4 of FIG.
1 showing the switch as in FIG. 3;
FIG. 5 is a sectional view similar to FIG. 4, but show
ing the switch in an out~of-contact position;
FIG. 6 is a sectional view taken along line 6-6 of
FIG. 5;
FIGS. 7 to 10 inclusive illustrate a modi?ed form of
switch mechanism of my invention;
The present invention relates to improvements in a co
FIG. 7 being a sectional view in side elevation of the
axial or other waveguide switch and more particularly to 10
modi?ed switch structure;
a switch assembly of the general type of which the stator
FIG. 8 being a sectional bottom plan view taken on a
comprises a ?at connector assembly plate having a plu
rality of waveguide connectors terminating in flat, end
on relation, and of which the movable member cooperat
line 3-8 of FIG. 7;
FIG. 9 being a detail sectional view in side elevation
taken on a line 9-9 of FIG. 8; and
ing therewith includes a bridging conductor arranged to 15'
FIG. 10 being a detail sectional end view taken on a
close a waveguide circuit between a selected two of said
line lit-16} of FIG. 9; and
connectors.
FIGS. 11 to 13 inclusive illustrate a further modi?ed
In a coaxial or other waveguide switch of the type de
form of switch embodying the invention;
scribed it is of particular importance to secure continu
FIG. 11 being a view in side elevation of the modi?ed
ous peripheral contact of the outer conductor as between 20
switch structure in which two bridging conductors are
the movable member and the stator in order to reduce
to the greatest possible degree the inevitable leakage of
the radio frequency signal from the active to an inactive
shown for connecting selected peripherally arranged
switch contacts;
the presence of a conductor within the surrounding wave
which the casing is comprised of motor housing 10, switch
housing 12, and connector assembly plate 14. These cas
FIG. 12 is a sectional view in side elevation taken on
conductor. Heretofore, however, this has only been
a line ll2—ll2 of FIG. 11; and
achieved through precision machine work, which is so ex 25
FIG. 13 is a sectional bottom plan view taken on a
pensive as to render the achievement of low leakage in
line l3~l3 of PEG. 11.
such structures impractical in most instances. Too, par
The switch structure is best shown in FIGS. 1 and 2 in
ticular problems are present with coaxial switches, due to
guide.
30 ing elements are preferably made of metal.
of simple construction yet which will at the same time
operate with the high degree of accuracy and precision
The con
nector assembly plate is equipped with a number of con
nector elements extending parallel to the axis of the switch
and to each other. In the embodiment of ‘the drawings
ing the movable switch member to cause the bridging
plate wherein one central connector element 16 is pro
It is hence an object of the present invention to provide
an improved switch of this general description which is
required without the necessity of impractical machine 35 shown, the coaxial conductors have a central and a sur
rounding tubular conductor terminating in ?at, end-on re
work.
lation.
More speci?cally, these surrounding conductors
In accordance with this object, a major object of the
are de?ned by bores 15, 17, 19, 21, 2:3, 25 and 27 in said
invention consists in the manner of supporting and guid
outer conductor to establish a continuous peripheral con 40 vided having six connector elements, 18, 2t), 22, 24, 26
and 28, arranged concentrically around it. These parts
tact with any two selected connectors, in such a manner
are all stationary.
that cross-talk causing radio frequency leakage is much
reduced.
The switching operation is performed by a rotor, the
body
of which is indicated at 38. The rotor body is
Another object of the invention is to control the con
tacting movement of the central conductor of a coaxial 45 made of metal, and in the embodiment shown is generally
rectangular in shape, with a length sufficiently shorter
switch in such a manner as not to interfere with the func
than
the inside diameter of switch housing 12 so that the
tion of the surrounding conductor, as well as to prevent
damage to the central conductor during switching.
In order to accomplish these objects of the invention,
the movable switch member is supported so as to provide
a universal connection freely adjustable to permit the
two ends or" the surrounding tubular waveguide conductor
of the bridging conductor assembly to be brought and
maintained in continuous peripheral Contact with the as
sociated connectors. An inner conductor may prefer
ably be pressed against its mating inner conductor by in
dependent means so as not to detract from the forces ap
plied between outer conductors.
rotor is free to move within the limitations of its mount
ing, which will be described later, without being con
strained in its movement by the walls of the housing.
In this type of switch, advantage is taken of available
methods by which close and precise mating or butting sur~
faces can be generated by practical machining methods,
‘such as (without restriction thereto) the grinding of mat
55 ing surfaces each to a high degree of flatness. When said
connector plate 14 and the bottom surface of said rotor
36 are so mated the leakage of radio frequency signal
from the rotor channel (due to discontinuity in the
coaxial outer conductor at the point of mating) can be
With the above and other objects in view as may here—
inafter appear the several features of the invention con 60 substantially eliminated, thus providing a high degree of
attenuation, or “cross-talk” reduction between active and
sist also in the preferred devices, combinations, and ar
rangement of parts hereinafter described and claimed
which, together with the advantages to be obtained there~
by, will be readily understood by one skilled in the art
‘from the following description taken in connection with
the accompanying drawings, in which:
FIG. 1 is a sectional view of a switch embodying fea
tures of this invention;
inactive radio frequency channels.
Extending transversely through rotor body 3% is a Wave
guide de?ning cavity 31 having within it a bridging con
ductor 32, bent twice at right angles at intermediate points
in its length and movably supported in said cavity by in
sulating blocks 34. One of the terminal ends of the
bridging conductor is exposed at 36, at the lower surface
of the rotor near one outer end thereof, and the other
FIG. 2 is a bottom view of the switch;
70 terminal end is exposed at 38, at the lower surface of the
FIG. 3 is a sectional view taken along line 3-3 of
rotor at its axis. Terminal end 36 is positioned to make
FIG. 1 showing the switch in a contacting position;
contact with the central conductor of any of the six other
8,076,888
3
connector elements 18, 24}, 22, 24, 26 and 28, and terminal
end 38 is positioned to make contact with the central ele
ment 16 (see FIG. 2).
The inner bridging conductor'32 is provided with an
upwardly projecting insulating contact operating pin'44
which is biased downwardly by a hairpin spring 46, where
by the operating‘ pin pushes both end terminals of the
conductor downwardly into good contact with the central
conductors, and independently of the surrounding con
ductors.
The rotor 30 is mounted on an axially disposed shaft
48 "by means of a‘hairpin spring 50, which is fastened to
the upper surface of the rotor by a'clamp 52 into which
are threaded two bolts '54, and to cam 56, which is pinned
4
In order to position the rotor in accurate regular con
tacting position at any one ,of the outer connecting ele
ments, there is provided positioning mechanism, desig
nated generally at 79 cooperating with cam 56, as shown
in FIGS. 1, 4, 5 and 6. The positioning mechanism
referred to acts to determine the angular position of shaft
48, and thus to determine the angular position of the
rotor. 3b. This positioning mechanism comprises two
roller arms 80, each consisting of a hairpin-shaped strip
10 carrying between its two legs a roller 82 rotatably mounted
on a pin 84, and two springs 86 joining the roller arms
at their'ends by means of pins 88 and 9b, and pressing the
two arms towardeach other. This action is resisted by
the bearing of rollers 82 against cam 56. By means of
pins 88, which are located diagonally opposite each other,
to shaft 48 by pin 58, by clamp 66 and bolts 62. This 15 the roller arms are suspended from the cover plate 92 of
mounting spring is of a form to transmit rotational move
ment of shaft 43 to the rotor, but‘ also pushes the lower
waveguide de?ning surfaces of the rotor into ?rm pres
sure contact with the upper plane surface of connector
switch housing 12, thereby preventing the positioning
independently of, the central conductor, thereby assuring
good electrical contact between these surfaces, to prevent
in FIGS. 3 and 4, normally the cam 56 is positioned so
mechanism from rotating with cam 56.
0am 56, as best shown in FIG. 3, has twelve evenly
spaced teeth with arcuate tooth spaces between them hav
assembly plate 14 around the entire periphery of its bores 20 ing a radius equal to the radius of rollers 82. As shown
that the rollers lie in opposite tooth spaces. When shaft
cross-talk; It will be understood that other forms of uni
43 is rotated, oppositely disposed cam teeth bear against
versal mounting that achieve these ends may be substituted
the rollers forcing roller arms 86 to move in a direction
25
for spring 59, as hereinafter more fully set forth in the
away from the shaft, pivoting about pins 88. Springs 36
modi?ed forms of switch structures shown in FEGS. 7
oppose this movement, and this opposing force, acting
to 13 inclusive, so long as continuous contact is provided
through the arms and rollers, always tends to rotate the
throughout the periphery of the outer tubular conductors
surrounding the central conductors, and preferably by
cam into a position so that the roller may rest snugly in
30 oppositely disposed tooth spaces resting against the
means independent thereof, as shown and described.
rollers. The cam is so positioned on the shaft with re
With the construction shown, the center of force of
spect to the rotor 35? that six of these positions, de?ned
the'axial thrust exerted on the rotor 39 by the hairpin
spring 50 is‘ located substantially half-way between the
switch axis represented by the central connector 38 and
the‘ outer terminal end 36 of the bridging connector 32.
The two downwardly projecting cylindrical tubular inserts
64‘ and 66» circling the terminal ends 36 and 38 de?ne the
ends of the surrounding waveguide conductors. The in
serts are ?xedly secured in the rotor so.
Since, as above
noted, the focus of the-downward thrust of the hairpin
spring 59 is-located approximately half-way between the
two inserts, a ?rm engagement of the rotor with the con
nector plate 14 at all points of contact is assured, thus
providing a sturdy and accurate support for the vertically
shiftable inner bridging conductor 32. and likewise achiev
ing a highly effective sealing of the gap between the con
nector'plate'M-and the RF channel contained in the rotor,
e?ning the surrounding waveguide.
Shaft 48 is rotatably mounted in bearings 63, and in
the-embodiment shown is designed to be rotated by drive
unit '71}, but it may also‘ be designed to be rotated
manually, by means of a knob (not shown) on shaft 46‘.
By rotation of the shaft the rotor may be positioned so
as to provide a connection between the central-connector
element 16 and any one‘of the other elements 18, 2-6, 22,
24,26 and 28.
In order to reduce wear on terminal ends 36 and 38
by alternate tooth spaces 92, correspond accurately to the
six contacting positions of the rotor. The other six posi
tions, de?ned by tooth spaces 94, correspond to out-of
contact positions of the rotor. Thus it will be seen that
accurate position of the rotor at all times is achieved by
the positioning mechanism.
The operation of my improved switch will be described
brie?y as follows:
The rotor 36 is rigidly supported toturn as a unit with
the control shaft 48 by the hairpin spring Stl, while at the
same time over the area of contact with the stationary
connector plate 14 as de?ned by the two circular inserts
the rotor 30 is held ?rmly in engagement with the con
nectorpla‘te 14. The center of gravity of the downward
pressure exerted by the spring 50, being located about
half-way between the innermost insert 63 and theouter
most insert 69, insures an even distribution of this down
ward pressure, which remains unchanwed during rotation
of the switch from one to another position.
The universal connection provided by the hairpin spring
5!) has the advantage that it provides a connection between
the rotor 39 and control shaft 48 which rigidly supports
these parts against relative rotational movement while.
permitting the rotor to adjust itself freely in any direction:
to the surface of theconnector plate 14 under the yield~
able ax-ial'thr'ust of the spring St}.
The inner bridging conductor 32 isrnoved in an up and
of inner bridging conductor'SZ during rotation, the con
nector assembly plate 14 is provided with a detent ring '72
down direction againstv the centrally directed. thrust of
shown in section in FIGS. 1' and 6 having spaced depres 60 hairpin spring 46 by the engagement of the ball 78 besi‘ons 74' adjacent to each outer connector element, and
tween the bridging conductor 32 and the cammed surface
‘rotor body'3'9 is provided with ‘an insulating lifter pin 76
of the ring insert 7-2 in the connector plate 14. At the
hearing against conductor 32 at a location more ‘or less
location of eaohswitch engaging position of the rotor 30,
central between its bends and riding'on operating ball '78. 65 the ball 78 drops into a recess 74 in the insert 72 causing
As best shown in F365. 1 and 6, ball 78 rides on a detent
the two ends of the bridging conductor 32 to be moved
ring 62, and ball 78 and pin 76 are so dimensioned that
quickly and ?rmly into engagement with the respective
connectors‘ 16 and 18. This arrangement of the switch
make and break mechanism has been found of great ad
the inner bridging conductor 32 is lifted so that its termi
nal ends are clear of the ‘surface of plate 14, but when the 70 vantage particularly as applied to a coaxial switch to in
sure a rapid simultaneous closing and opening of the
rotor is‘in a contacting position (FIG. 1) the ball rests in
switch contacts which avoids arcing, and which further
‘one ofthe depressions '74, permitting‘th‘e'bridging conduc
when the rotor is between contacting positions- (FIG. 6)
reduces contact resistance and prevents electrical losses
tor to be pushed into contactby spring 46. The central
during switch operation.
conductor has sufficient freedom of ‘movement in the in”
Full enclosure of signal‘ carrying elements, which in
75
sulatiri’g'blocks" 34 to permit this action.
5
3,076,883
clude bridging connector 32 and contacts 36, 33, 15 and
13, within rotor assembly 3t}, combined with freely seat
ing spring enforced contact between the circular inserts
and the base plate 114 prevents radiation of any of the
radio frequency signals from said signal carrying elements
to any signal conductive elements or connectors which
are not in use in a given switch position. The high at
tenuation between used and unused positions and the low
“cross-talk” achieved is one of the great points of merit
in this type of switch design.
An alternative form of switch structure which embodies
therein the several features of the invention is shown in
FIGS. 7 to 10 inclusive of the drawings. The switch
motor housing 19, switch housing 12 and base are iden
tical with those shown in FIGS. 1 and 2. The base spe
ci?cally comprises connector assembly plate 14 having one
central connector element 16 and six connector elements
18, 2t), 22, 24, 26 and 28 arranged concentrically around
it. The face of the assembly plate 14 is formed with
spaced depressions 74 adjacent each outer connector ele
ment. As in the embodiment of FIGS. 1 to 6 inclusive
the switch rotor is carried on a vertically disposed rotat
able shaft 1-i8 which is driven by the electric motor 7t}
shown in FIG. 1. The rotor positioning mechanism is
similar to that above described in connection with FIGS.
1, 4, 5 and 6.
The rotor in the modi?cation shown in FIGS. 7 to 10
takes the form of a guide box 100 which is rigidly secured
bridging conductor 194 to be lifted so that the terminal
ends of wire 116 are clear of the surface of the plate 14.
The guide box rotor assembly described and illustrated
in FIGS. 7 to 10‘ inclusive has the advantage that an ex
tremely accurate positioning control is maintained over
the rotor and associated bridging conductor while at the
same time the parts are enabled to adapt themselves free
ly to the surf cc of the connector assembly plate 14 and
thus to avoid leakage of the radio frequency signal from
said signal carrying elements.
The rotor and bridging conductor assembly illustrated
in vFIGS. 7 to 10 inclusive has been found particularly
suited for use in a switch adapted for the closing of se
lected peripheral outer connectors with one another. A
switch of this general description is particularly shown
in the modi?cation of FIGS. 11 to 13 inclusive. The
switch assembly illustrated in this latter modi?cation
comprises switch base connector assembly plate 14 which
in this instance is provided only with the peripherally
arranged connector elements '18, 20, 22, 24, 26 and 23,
as shown in FIG. 2, and depressions 74 which are spaced
between adjacent connectors to receive a bridging con
ductor lifting ball 78.
The switch rotor is mounted on rotatable shaft 43
which is driven by the motor '70 (see FIG. 1), and has
secured thereto a rotor positioning mechanism including
a cam 13!) formed with accurate tooth spaces similar to
those described in connection with the switch structure
shown in FIGS. 1 to 6 inclusive.
axis of shaft 48 above the connector assembly plate 14. 30
The rotor assembly of the switch shown in FIGS. 11
The guide box 1% houses a bridging conductor assembly
to 13 inclusive comprises two rotor bodies 1.32, 134 which
including a rotor body 102 which is mounted for universal
are identical to that shown in FlGS. 7 to 10, including
movement within the guide box, and is spring biased yield
the rotor body and, housed therein, an inner bridging
ably against the connector assembly plate 14, so that the
rotor 162 is held at all times squarely against the surface - conductor iii-4 which is spring biased downwardly with
relation to the rotor body by means of a leaf spring ‘113.
of the connector assembly plate 14. The rotor ltll‘. in
The two rotor bodies 132., 134 are supported in parallel
turn houses inner bridging conductor 104 which is spring
relation one at each side of the rotational axis of shaft
biased against the central conductors lo, 18 of the outer
‘is by means of a frame 136 comprising a square plate
and central connector elements respectively.
to the lower end of rotor shaft 48 for movement about the
which is pressed downwardly by a coiled compression
The rotor body 102 is generally oblong in shape and is 40
spring 1451’ seated at one end in a bracket 142 secured to
pressed downwardly by means of a bowed ?at spring 196
the lower end of shaft 48 and at its other end in a recess
which is seated at its midportion against the cover portion
‘M4 in the plate 133. A pair of downwardly extending
of guide box 199 and at its two ends engages lugs 1%,
lugs mounted on the bracket 142 engage in recesses
11d formed on the ends of the rotor ltli'. adjacent the
lower edge thereof. This arrangement of spring ass and 45 formed in the plate 138 and act as drivers, rotating the
lugs 1598, Hit provides for complete freedom of adjust
ment of the rotor in every direction. The housing sur
face for the rotor comprises a boss 112. shaped to provide
two end rings and a smaller central ring connected to
rotor assembly as a unit with shaft 48. A strap 146
rigidly secured by two screws 14 , 15%} to one side of the
plate 138 is provided at each end with hook shaped
recesses which engage with lugs 1'52, 154 formed on the
gether, the boss 112 being formed on the bottom of the 50 ends of rotor bodies 132, 134 respectively. A second
strap 156 pivotally connected by a pin 15%? to the other
rotor 132 for engagement against the connector assem
bly plate 14.
side of plate 138 has formed in the ends thereof recesses
which engage lugs 160, 162 in the other ends of the
The inner bridging conductor lild consists of a cylin
‘ rical casing 114 of non-conducting material which is
rotor bodies 132, 134 respectively.
bowed downwardly at each end and has mounted therein
a conductor wire "116. A small leaf spring 113 seated
is such as to permit a universal movement of each rotor
‘against one face of a recess 1253 in the upper portion of
the rotor body 1%; engages against an upwardly project
ing lug 122 on the inner bridging conductor 104 to press
the inner bridging conductor 1134 yieldably against the
central conductors 46, 42.
The arrangement of the rotor assembly above described
body 132, i134 and to cause each said rotor body to be
pressed downwardly so that it is held firmly and squarely
in contact with the connector assembly plate at all times.
In operation the entire assembly is pressed yieldably
downward by spring 142. The plate 138 is free to tip
In order to avoid wear on the terminal ends of the
sufficiently to insure a cross distribution of said down
or connector element, and the bridging conductor has
formed thereon an insulated lifter pin 1215 which rides
on each end thereof, and a further adjustment is permitted
ward pressure to both of said rotor bodies, and along
wire 1&6 of the inner bridging conductor ltld during
the length of same, the rotor bodies are each freely
rotation, spaced depressions 7d are provided in the face
of the connector assembly plate 14 adjacent each out 65 rotatable about the axis of the supporting lugs formed
on an operating ball 78 carried on the connector assem
by the rocking of the strap 155 about its pivot 158.
The construction and operation of the bridging con
ductors housed in the respective rotor bodies is identical
bly plate 14. In each of the operating positions of the
with that previously described in connection with the
70
switch, as shown for example in FIG. 9, the ball 78
embodiment of FIGS. 7 to 10 inclusive, and need not
rests in a depression 74} so that the inner bridging con
be repeated.
ductor terminals are engaged with the central conduc
tors ‘16, 18. During rotation of the rotor body N2 the
ball '78 rides out or" the depression ‘74 causing the inner
Thus, it will be seen that the invention provides a novel
coaxial or other waveguide switch structure having a
unique universal mounting wherein continuous peripheral
3,076,883
7,
contact of the mating surrounding waveguide conductors
is' established and maintained and‘ wherein the central
coaxial'conductors are maintained in suitable contact in
dependently thereof yet releasably while switching. Vari
ous modi?cations of the preferred embodiments of the
invention herein shown and described, yet within the
spirit of the invention and the scope ‘of the appended
claims, will be ‘apparent to those skilled in the radio fre
8:?
means biasing said inner bridging conductor against said
connector assembly plate.
4-. A coaxial switch having in combination a switch
stator assembly comprising a ?at connector assembly
plate, connectors including a plurality of outer connec~
tors circularly disposed about a centralaxis on said plate,
a switch rotor assembly comprising a rotatable shaft
mounted perpendicularly above said plate along said axis,
a support rotatably guided from said shaft to turn there
with on said axis comprising a horizontally disposed.
member having parallel sides, a pair of rotor bodies, a
is:
strap rigidly secured to one of said sides having pivoted
1. A rotor‘ assemby for a switch having a flat connec;
connections with the similarly directed ends with said
tor assembly plate with a plurality ‘of tubular switch
rotor bodies, a second strap pivotally connected to the
connectors terminating in ?at end-on relation arranged
other of said parallel sides and having pivotal connec
15
thereon, and a rotatable rotor supporting means rotatably
tions with the other of said rotor bodies, and a spring
adjustable to any one of a plurality of connector bridging
engaging a central portion of said member to bias said
positions, which comprises a support ro'ta'tably guided for
member and rotor bodies downwardly against said con
turning movement, a rotor body mounted for movement
nector assembly plate, thus providing a uniform evenly
as a unit therewith, said support having means for biasing
directed pressure of said rotor bodies against saidv con~
said rotor body against the connector assembly plate and 20 nector
assembly plate, a bridging conductor ‘assembly
provision for free adjustment of said rotor body about
associated
with each of said rotor bodies, each comprising
longitudinal and transverse axes, and a bridging conduc
an inner bridging conductor adapted for bridging selected
tor assembly including a tubular bridging conductor com
switch connectors, supported by said rotor bodies for
prising a rigidly formed insulated element with separated
movement
relatively thereto against said connector as
25
contacts adapted for bridging selected switch connectors
sembly plate, and means biasing said inner bridging con
supported by said rotor body for universal movement
ductor against said connector assembly plate.
relatively thereto for uniform contact of said connectors
5. A coaxial switch having, in combination, a switch
about the periphery thereof, and means biasing said bridg~
housing, a switch stator assembly mounted in said hous~
ing conductor against said plate.
2. A rotor assembly for a coaxial switch having a ?at 30 ing comprising a central connector, and cooperating con
nectors circularly spaced about said central connector,
connector assembly plate with a plurality of switch con
2. switch’ rotor mounted in said housing rotatable to a
nectors arranged thereon, and a rotatable rotor supporting
plurality of operating positions and comprising a bridging
and control shaft extending perpendicularly above said
conductor assembly shiftable for connecting said central
plate rotatably adjustable to any one of a plurality of
quency connector art.
The invention having been described, what is claimed
connector bridging positions, which comprises a support
connector with any one of said cooperating connectors,
a rotary control shaft supported perpendicularly to said
switch stator assembly in said housing, means for rotating
said rotor and having the open bottom side thereof overly
said shaft, and a hairpin spring connecting the switch
ing and in close proximity to said connector assembly
rotor
to said rotary control shaft ‘providing a positive
plate, a rotor body which comprises an elongated casing
connection therebetween and a spring pressed
loosely housed in said support, spring means within said 40 rotating
connection axially therebetween having a universal ac
boxlilie structure having a pivotal connection with each
tion to bias said switch rotor bodily against said switch
end of said rotor body for biasing said rotor body down
stator assembly.
wardly against said plate while permitting freedom of
6. A coaxial switch having, in combination, a switch
adjustment about longitudinal and transverse axes, and a 45 housing,
a switch stator assembly mounted in said hous
bridging conductor assembly including an inner bridging
ing
comprising
a central connector, and cooperating
conductor comprising a rigidly formed insulated element
connectors circularly spaced about said central connector,
with separated contacts which is freely movable toward
a switch rotor mounted in said housing rotatable to a
and away from said plate within said rotor body for bridg
plurality of operating positions and having a bridging
ing selected switch connectors, a leaf spring within said
conductor assembly movable with the rotor and includ
rotor biasing said inner bridging conductor against said
ing an inner bridging conductor axially movable thereon
in the form of an inverted boxlike structure attached to
plate, and cam and follower means between said con
nector vassembly plate and said inner bridging conductor
to raise said inner bridging conductor during rotation
for connecting said central connector with any one of
said cooperating connectors, a rotary control shaft sup
shaft mounted perpendicularly above said plate along said
and said latter hairpin spring biasing said inner bridging
ported perpendicularly to said switch stator assembly in
from one to another connector bridging position.
said housing, means for rotating said shaft, a hairpin
3. A coaxial switch having, in combination, a switch
spring connecting the switch rotor to said rotary control
stator assembly comprising a flat connector assembly
shaft providing a positive rotating connection there
plate, connectors including a plurality of outer connec
between, and a spring pressed connection biasing said
tors circularly disposed about a central axis on said
switch rotor bodily against said switch stator assembly,
plate, a switch rotor assembly comprising a.- rotatable 60 and a second hairpin spring connected between said shaft
axis, a support rotatably guided from said shaft to turn
conductor bodily against said connectors, and cam and
therewith on said. axis, having pivotal connections with
follower connections between said inner bridging con
opposite ends of each of a pair of rotor bodies spaced
ductor and said switch stator operable to move said in
from one another in parallel relation at opposite sides of 65 ner bridging conductor away from said connectors dur
said axis, spring means acting on said. support to bias
ing rotational movement of said rotor from one, to an
said rotor bodies against said plate, a bridging conductor
other switch engaging position.
assembly associated with eachof said rotor bodies, each
comprising an inner bridging conductor comprising a
Referenees Cited in the file of this patent
rigidly formed insulated element with separated contacts
which is freely movable toward and away from said plate
UNITED STATES PATENTS
within said rotor body for bridging selected switch con
Kram et al ___________ __ Mar. 21, 1944
2,344,780
nectors, supported by said rotor body for movement rela
tively thereto against said connector assembly ‘plate, and
2,709,725
Bieber et al. _________ __ May 31, 1955
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