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Патент USA US2408787

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Oct. 8, 1.946.4
2,408,786
A. J. LOMBARDI
TUNING MECHANISM
Filed Feb. 15,' 1943
F I G.. .a
lNvENToR
A. J. LOMBARDI
BY n Í/ß
ATr’oRNEY
2,408,786
Patented Óct. 8, 1,946
VUNITED STAT-Es .rn'rlanrn‘l OFFICE
Anthony J. Lombardi, Floral Park, N. .Y., assignor
to Sperry Gyroscope Company, Inc.,fBrooklyn,
N. Y., a corporation of New York
'
Application February 15, 1943, Serial No. 476,011
5 claims. (Cl. 178-44)
2
1
prising mainly a section along line 2-2 of Fig. 1;
This' invention relates to electronic apparatus
Fig. 3 is a fragmentary elevation in section
and is more particularly concerned with tuniner
illustrating an optional construction in the line
mechanism for such apparatus.
adjustment control wherein a tri-ball adjustment
In its preferred embodiment the invention will
is provided;
.
be described as adapted for fine adjustment gang
Fig. 4 is an elevation, partly in section along
tuning mechanism in electronic apparatus of the
line 4--4 in Fig. 5, illustrating a further embodi
hollow resonator type;
ment of the invention; and
For gang tuning a two resonator velocity modu
Fig. 5 is a plan View broken away and in sec
lation device, it has become usual to simultane
ously vary the input and output electrode spac-v 10 ttion illustrating details of the tuning mechanism
of Fig. 4.
ings in the device. Various ñne adjustment
Referring to Fig. 1, which illustrates a velocity
,mechanisms have been suggested, tested and used
modulation device of the two resonator type sub
for gang tuning in this manner. Many of these
stantially symmetrical’about axis A-A, a pronged
have proved unreliable in that theyiare not capa
ble of reproducible adjustment, some have poor 15 base II of conventional construction provides a
life due to excessive or uneven wear in the parts,
sealed closure for one end of a glass tube I2 en- _
and the most reliable adjustments heretofore
known are essentially complicated and require
many accurately machined' parts.
It is therefore the‘major object of the present 20
closing a suitable cathode assembly I3. At its
other end, tube I2 is sealed concentrically with a
relatively heavy annular metal disc I4, the outer
invention to provide a novel gang tuning mech
anism for electronic apparatus which isy inexpen
diameter of which is about twice the diameter `
~ of the tube I2.
A cylindrical metal barrel I5 provides a com
>mon side wall for input and output resonator
sive, simple in construction, reliable and accurate
chambers I6 and I'I, respectively. Internally,
during repeated tuning cycles, and which has a
working` life comparable to the device in which 25 barrel I5 is formed with a ñange I8 for mount
ing suitably shaped stampings I9 and 2|- which
itis employed.
, _
comprise the inner end and side walls of the res
A further'object of the invention is to provide
a novel displaceable spherical ball, fine adjust
onator chambers.
ment mechanism for gang tuning in hollow res
onator and like electronic devices.v
It is a further object of the invention topro
vide a fine adjustment mechanism for gang tun
ing in a hollow resonator or other electronic
An annular flanged rigid collar- 22 extends be
tween disc I4 and the annular end wall 23 of
chamber I6. Wall 23 is annularly crimped, as
illustrated, so as to be fiexible in the direction
of the axis A-A. A second heavy metal disc 24,
preferably identical with disc I4, is similarly
device wherein translational movement of an ad
justable tuning control is divided in a novel man-1 35 rigidly connected to the flexible annular end wall
ner into generally oppositelyl directed Atransla
tional forces and movements, angularly related to
' 25 of chamber I'I by a flanged collar 26 similar to '
the direction of 'movement of> said control and
Parallel input grid electrodes 2T and 28 are
mounted on collar 22 and wall I9, respectively,
and'parallel output grid electrodes 29 and 3l are
mounted on wall 2I and collar 26, respectively.
The above-described construction, which is rep
resentative of a hollow resonator device for which
my invention is primarily adapted, is designed so
that displacement of either or both discs I4 and
24 generally in the direction of axis A-Aof the
acting to simultaneously displace ~ vtwo tuning
members in said device. Preferably these .oppo
site movements are equal in amount andvat right
angles to the driving movement.
A further objectl of the invention is'toY provide
a novelv gang tuning mechanism for obtaining
accurately tracking input and output electrodev
spacing adjustment in a hollowV resonator or like
electronic device
l
>
'
Further objects of the invention will presently
appear as the description proceeds in connection
with the appended claims and theannexed draw
ing wherein:
`
,Y
"
_
y'
collar 22,
,
device will result in changes in the inputI and/or
output grid spacing `because lof the flexibility of
walls 23 and 25.
'
In many devices of this nature it is desirable
that'thespacing of both input and output grids
Fig. 1 isa vsideelevation partly broken away
andV partly in sectionillustrating a-preferred form
-be altered at the- same Ytime and by the same
amount, and it is' to that-end that the gang tun
of my novel gang tuning mechanism;
ï- ing mechanism Shown in'Fig, 1 is directed. Y ~ .
`
'
»» Fig. 2 is lan'- enlarged fragmentary view com
Intermediate its ends, barrel> I5 has rigidly e
2,408,786
3
4
_
mounted an external ñange 32 to which is se
cured, as by machine screws (not shown), a
heavy metal mounting ring 33. Ring 33 is formed
with an external, longitudinally extending pe
ripheral groove 34 for rigidly seating a hollow
cylindrical metal guide tube 35 disposed gen
erally parallel to axis A--A. Tube 35 is aper
tured intermediate its ends to receive a second
hollow cylindrical guide tube 3E which is rigidly
secured thereto. The axes of tubes 35 and 38 are
disposed at right angles, so that a substantially
integral T-shaped hollow fitting is provided rig
idly secured to ring 33 and having an extension
projecting radially outwardly from the device.
While guides 35 and 3S are preferably at right '
angles, as shown, opposite arms of guide 35 may
be made at any desired angle to guide 36 without
departing from the spirit of the invention.
A-A, tend to draw discs I4 and 24 toward each
other, While the coarse and fine adjustment de
vices above-described positively oppose the pull
of the springs.
In practice, the parts are assembled as shown
in Fig. 1, screws 43, 44 and 41, 48 providing coarse
adjustments for preliminarily setting the device
nearly in operating condition. At this point, the
rounded tips of each pair of screws 41, 48 is in
engagement with opposite sides of ring 33 and
.the fine adjustment parts are in solid contact,
as illustrated.
When knob 40 is rotated, screw
45 is translated along the axis of tube 36 to ad
vance driving ball 39 further into tube 35. Such
causes the simultaneous and equal outward dis
placement of balls 31 and 38 in opposite direc
tions, but parallel to axis A-A. This displace
ment of balls 31, 38 is transmitted through pins
4I, 42 and screws 43, 44 to effect relative separa
desired size. Since they are cylindrical, this 20 tion of discs I4 and 24, thereby causing grid 21
to be displaced away from grid 28 by exactly the
operation can be accurately and conveniently
same amountand at the same time that grid 3|
done. A plurality of spherical balls of the same
is displaced away from grid 29. This gang tunes
size are slidably disposed in tube 35, one set 31
the resonators. When screw 45 is rotated in the
being positioned to one side of the axis of tube
36, and the other set 33 being positioned to the 25 opposite direction, springs 49 cause the reverse
of Ytheabove operation and reduce the grid spac
other side of the axis of tube 35. While two balls
ings simultaneously >and equally. I have found
are illustrated in each set, one or any other de
Tubes 35 and 33 are internally machined to
sired number of balls may be so provided.
A
spherical ballA 39 is slidably disposed within tube
33 so as to partly project into the interior of
tube 35 to contact the two adjacent balls 31
and 38.
`
Ball 39 is shown as of the same diameter as
balls 31 and 3S, but may be larger or smaller
as desired.
In any event each ball is selected
of such size as to accurately nt snugly but slidably
within its supporting guide tube.. Preferably, the
balls have an outside diameter almost exactly the
that by this arrangement the >input and output
Vgrid spacing. adjustments track accurately over
the tuning cycle life of the resonators.
As discs I4 and 24 are relatively separated or
drawn together by action of the iine adjustment
mechanism, their relative> motion is not exactly
parallel, but >is rather a 'pivotal displacement ful
crumed at the rounded tips of screws 41, 48.
However, the> actualdistance moved by the grids
during'the entire ñne adjustment range neces
sary ior tuning the resonators is so small that
this departure from actual parallelism is
4,0 negligible- For example, in a tube of about the
actual 'size' shown `in Fig. 1, the tuning movement
ably precision-made bearing balls of the type
range is only about 0.03 inch.
used in high grade ball bearings. Such bearing
The above-described ñne adjustment is very
balls are hardened steel, are accurately spherical,
accurate and reliable, and the two 'grid spacings
are capable of withstanding extremely heavy
radial loads, and are hence admirably suited to 45 track perfectly during the tuning cycle life. Balls
3?»-39 are in substantially point contact only
the invention.
with each other and their associated guide cylin
Outer balls 31 and 33 are contacted by the
ders at all times so that thereV is theoretically no
suitably concaved ends of link pins 4I and 42
friction, andïeven" the small friction which may
which may extend lwithin the opposite ends of
4existpractically Ycan be reduced by providing a
tube 35, and pins 4l and 42 in turn have their
suitable lubricant in the T-iitting. I have .thus
convex- outer ends seated in suitable concave mat
`vprovided a substantially frictionless mechanism
ing surfaces in the ends of coarse adjustment
.for converting motion of translation in a given
screws 43 and 44 threaded in discs i4 and 24.
direction _tojmotion of translation at right angles
This in eiîect comprises a universal link connec
thereto in opposite' directions. Precision-made
tion between each outer ball 31, 38 and its asso
same as the inner tube diameter so that there
is no diametral play.
ciated screw.
Balls 31-39 are prefer
While pins 4I and 42 are shown
as independent members, they may, if desired,
comprise universally jointed extensions of the
screws.
`
Tube 35 is internally threaded for adjustably
mounting a screw 45 having a reduced shank
terminating in a hardened planar face 46 at
right angles to the tube'axis and adapted to
contact ball 39. A suitable manual knob 48 is
provided on screw 45 for convenience in»adjust-,y _
At points spaced 126° on either side of the
above-described ‘ line
adjustment
mechanism,
flange 33 is engaged at opposite sides by the
55V balllbearingslfor the purpose are vreadily and in-
Áexpen'sively. available in quantity.r .
Furthermore, Vduring repeated'adjustment, the
.ballsn usually. become relatively rotated, thereby
"equalizing the wear on each other and the guides.
_' Sincefthe forces acting between ball 39 and.
adjacentballs 31, 38 are radial, the components
parallel to the guide axis of guide 35 are small
as comparedto the force, so that using a suitable
threadâat 45 almost any desired fine movement
can be obtained. All the parts are in solid oon
tact without play, and it is important to note
thatv thereis little or no frictional wear on the
l'pins¿4I, A42V or the threads by screws 43, 44..
rounded end tips of relatively coarse aligned ad
_ My iine adjustment is inexpensive to make
justment screws 41 and 48 threaded in discs i4
as the only accurate machine operations required
and 24, Similarly, the outer peripheries of »discs
,I4> and 24 areinterconneoted 4by> three »equally
spaced strongY tension ‘ springs 49 (only one
shown);Y V'Springs '49, which ,are parallel to >axis`
are Ireaming -of ,the cylindrical guides, so that
_considerable `savingsnare leiïected ,by the inven
tion.
ß
'
f In the form' of the invention shown in Fig; 3,
2,408,786
5
.
the reduced inner end of screw rod 135 abuts
against ball 39 as in Fig. l. However, only one
ball 31, 38 is here used in each set, pins 4I, 42
being made correspondingly longer.
Referring now to Figs. 4 and 5, the ñne ad
assembly than might be expected from simply re
ducing their diameters.
As Inanychanges could be made in the above
construction and many apparently widely dif
ferent embodiments of this inventio-n could be
justment mechanism is illustrated as embodying
v made Without departing from the scope thereof,
a self-contained subassembly mounted in a cylin
drical block 55 which is removably mounted in a
suitable socket 5S integral with ring 33, as by set
it is intended that all ymatter contained in the
above description or shown in the accompanying
drawing shall be interpreted vas illustrative and
screw 57.
not in a limiting sense.
Block 55 is formed with lan axial bore 58
threaded at 59 for rotatably mounting adjustable
screw 6l. Intermediate its ends and disposed to
clear socket 56, block 55 is formed With_a pair
of aligned radial bores 62 and 63 smaller than
bore 58.
Thefinner end of screw 6! is a planar
-
What is claimed is:
l. In a line adjustment mechanism for gang
tuning electronic devices and the like, a support
having a cylindrical axial bore,fa rod mounted
in said bore for adjustment axially of said bore,
a slidable spherical ball in said bore adapted to
face 54 at right angles to the axis of block 55
be displaced by adjustment of said rod, opposed
in contact with a spherical ball 65.Y Ball 55 in `
radial bores in said support and opening into said
turn is disposed i-n surface Contact with two
axial bore, a spherical fball slidable in each of >
smaller spherical balls 66 and 61 in bores 62 and 20 said radial bores, each of said balls being of sub
B3, respectively. Link pins 4I and 42 contact
stantially the same diameter as its respective bore
balls BS’and G1 similarly to the structure shown
with the balls in said radial bores being substan
in Fig. l.
tially smaller than and adapted to contact said
Bores 53, S2 and 53 are vcylindrical guides which
ñrst ball, the size differential between the balls
may easily be accurately machined to size for 25 in the radial bore and the ball in the axial bore
slidably receiving the respective balls, as in Fig. 1.
tending to ensure that the latter-named ball is .
Preferably, the outer end of each bore 62 and 63
coniîned to the axial bore during its operative
is slightly deformed, as by a punch ‘prick as in
travel, and means for adjusting said rod to effect
dicated at 68, to limit radial outward displace
simultaneous outward displacement of the balls
ment of balls E6 and 61.
30 in said radial bores.
When knob 6B of screw 5I is rotated in one
2. The gang tuning apparatus defined in claim
direction, face 64 is displaced along the axis of
i, wherein said balls in said radial bores project
bore 58 to displace ball 55 and force balls 66 and
outwardly of said support during said adjustment.
51 radially outwardly, simultaneously and over
3. The gang tuning apparatus deñned in claim
equal distances. The ñne adjustment otherwise 35 1, including stop means for limiting adjustment
operates exactly as above-described in Fig. 1.
of said rod.
The necessary degree of movement required for
4. The gang tuning apparatus deñned in claim
resonator tuning is so small that limit stops 68
l,Y including stop ,means limiting outward dis
do not interfere with tuning over the entire nor
placement of said balls in the radial bores.
mal range. For further limiting the range of 40
5. In gang tuning apparatus for an electronic
adjustment, a stop collar 69 may be provided on
device, a substantially T-shaped guide, a spherical
screw 5I for limiting axial advance of screw 6l
ball slidably disposed in each arm and a third
within block 55.
A particular advantage of the construction
shown in Fig. 5 is that the sub-assembly on block
spherical ball slidably disposed in the stem of
said guide, the arms and stem of said guide each
having an internal diameter equal to the respec
55 may be assembled and handled as a unit, and
tive balldisposed therein with the ball in said
mounted for operation in the device, without dan-v
stem being larger than each of the other balls
ger of any of the balls dropping out. In assem
and in contact therewith, the size differential be
bly, ball 65 is dropped into bore 58, with screw
tween the balls in each arm and the ball in the
6| retracted. Then balls 66 and B1 are intro 50 stem tends to ensure that the latter named ball
duced into their respective bores through bore
isfconñned to the stem during its travel, and
58, and screw 6l advanced until the balls Contact
means in said stem for displacing the ball therein
and no ball can escape entirely from its asso
for eñecting simultaneous and opposite outward
ciated bore. Also, the balls 66 and 61 being
displacement ofk the balls in said arms.
smaller than ball 65, I ñnd that as a practical
ANTHONY J. LOMBARDI.
matter there is considerably less friction in the
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