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Патент USA US2405051

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@5115? 39? 1945=
'
' E. J. POITRAS ETAL.
2,405,051
STABILIZING MECHANISM
FORCE APPLYING MEANS
Filed Juqe 26, 1956
2 Sheets-Sheet 1
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RVOIR
INVENT
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‘Edwam%.].
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Jamoes
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THEIR ATTORNEY
July 30, 1946-
‘E. J. POI'II'RAS’ ETAL
I
,
STABILIZING MECHANISM
Filed June 26, 1936 '
mg
2,405,051 '
2 Sheets-Sheet 2
Patented July 30, 1,946
2,405,051
UNITED STATES PATENT OFFICE
2,405,051
STABILIZING MECHANISM
Edward J. Poitras, Jackson Heights, and James D.
Tear, Great Neck, N. Y., assignors to Ford In
strument Company, Inc., Long Island City,
N. Y., a corporation of New York
Application June 26, 1936, Serial No. 87,596
4 Claims.
.
(01. 33-46)
2
l
The invention herein disclosed relates to a
of surface targets. The system disclosed includes
stabilizing mechanism for stabilizing an object
the range ?nder A which is shown in part; a
mounted upon a movable platform, such, for
example, as the deck of a ship.
gyroscopic stabilizing mechanism B; and hydrau
lically operated follow-up mechanism 0 by means
Certain objects mounted upon movable plat
forms are of such a nature that they must be
rendered independent of the roll or pitch of the
of which movements of the gyroscope about an
axis is ampli?ed and transmitted to, to effect
movement of, the range ?nder A; a manual con
ship in order to be effective. Such an object,
trol means D for rotating the range ?nder, and
for example, is the range ?nder used in ordnance
a power unit E. The entire system including the
for determining the range of a target. As the
several parts A, B, C, D, and E, is mounted upon
ship rolls in the plane of the line of sight, the
a platform that is rotatable about a vertical axis.
range ?nder must be continuously rotated in
This platform (not shown in the drawings) is
accordance with the roll of the ship in order to
the usual platform upon which a range ?nder
keep the target in View.
is mounted and it is rotatable about a vertical
Heretofore, attempts have been made to sta 15 axis so that the axis of the range ?nder may be
bilize such objects and particularly sighting de
brought into a position perpendicular to the line
vices such as a range ?nder. Such attempts,
when made in conjunction with a gyroscopicv
stabilizing mechanism, take the form of stabiliz
ing the optical parts of the instrument such, for
example, as the optical prisms of the range ?nder.
However, the stabilization of the optical parts
of certain of such instruments has not been
found to be satisfactory and it is an object of
this invention to stabilize the instrument itself.
In accordance with the invention, a gyroscope
support is mounted adjacent the object to be
stabilized and a gyroscope is mounted in the
support for movement about an axis parallel to
the axis of rotation of the object to be stabilized
and an arm's perpendicular thereto. Mechanism
is also provided for effecting rotation of the object
in accordance with the relative movement of the
gyroscope and its support about the axis parallel
to the axis of rotation of the object. When
_ applied to a range ?nder, for example, the range
?nder is thus rotated in accordance with the roll
of the ship and is stabilized with respect thereto.
Such an application of a stabilizing mecha
nism embodying the invention is illustrated in
the accompanying drawings in which:
Fig. 1 is a diagrammatic illustration of the
stabilizing mechanism and its connection to a
range ?nder;
Fig. 2 is a longitudinal, sectional elevation of
the follow-up mechanism for rotating the range
?nder in accordance with the relative movement
of the gyroscope and its support; and
Fig. 3 is a diagrammatic illustration of the
devices for applying precessional forces to the ‘
gyroscope and the electrical connections in the
mechanism.
The system shown diagrammatically in Fig. 1
of sight to the target.
‘
The range ?nder A is, as is customary, mounted
in bearing brackets, only one of which I is shown
20 in the drawings. So mounted, the range ?nder
is rotatable about its longitudinal axis. On the
range ?nder, thereis mounted a ring 2 that is
secured to the range ?nder against rotation rela-.
tive thereto. The ring 2 carries a segmental gear
25 3 which may be formed integral with the ring.
This segmental gear 3 meshes with a pinion 4
mounted upon a shaft 5. A clutch 6 is provided
by means of which a crank 1 secured to the shaft
5 may be connected to the pinion 4 so that the
pinion 4 is rotated upon rotation of the shaft 5.
The crank 1 has a handle 8 for the manual rota
tion of the crank. When the clutch 6 is engaged,
rotation of the crank 1, eiiects'rotation of the
range ?nder about its longitudinal axis.
The power unit E includes an electric motor 9
that is supplied with current from the generators
of the vessel upon which the mechanism is
mounted. The motor 9 drives a generator In
which supplies power for the operation of the
" gyroscope ll of the gyroscopic stabilizing mech
anism B. The motor svalso drives a pump l2
which supplies oil under pressure for the opera
- tion of the hydraulically operated follow-up C.
The gyroscopic stabilizing mechanism includes
Lil a gyroscope support l3 shown in broken lines.
Within the support the gyroscope H is mounted.
The gyroscope has extending from diametrically
opposite sides thereof trunnions l4 and I5. The
trunnion I5 is journaled in a bearing Ilia formed
on a gimbal ring 16 and the trunnion I4 is jour
naled in the case of a precessional force apply
ing means I‘! that is mounted on the gimbal ring
l6. Extending from opposite sides of the gimbal
of the drawings is for stabilizing a range ?nder
ring "5 and perpendicular to the axes of the
that is primarily used for determining the range 55 trunnions l4 and I5, there are trunnions l8 and
2,405,051
3
4
precessional force applying means I? is controlled
ES. The trunnion i8 extends through a bearing
by a directional rheostat 43.
The wiring diagram for these precessional force
applying devices is illustrated in Fig. 3 in which
the lines 44, 45 represent a supply of direct cur
on a U—shaped member 25 and into the case
of a precessicnal force applying means 2| that
is secured to the support l3. The trunnion I 9
extends through a bearing Z?b on the U-shaped
member 26 and it is journaled in a bearing brack¢
et 22. The U~shaped member is thus supported
‘on the trunnions l5 and [9 which are journaled
rent.
The line 45 is directly connected to one
side of eachof the electromagnets 2'5‘, 28, 35,
and 3|. This connection is made through. a line
£25 connected to the line {#5, a branch‘ line 4'!
respectively in the case of the precessional force ,
connecting the line 46 to the electromagnets 30
and 3|, and a branch line to connecting theline
applying means 2! and the bearing bracket 22
which is mounted upon the support l3;v On the
ring l5, there is mounted a segmental constant
46 to the magnets 21 and 253. The line 44 is con
nected, through a line 49 to the inverted pendu
mm 34 and particularly the contacts 3'! and 38
rise cam 23 that is concentric with the trunnion
l s. The cam 25 has a cam surface which‘ rises in
both directions from the bisector of the seg
ment. Cooperating with this cam 23, there‘ is a
cam follower 24 mounted upon an arm 25 that is
pivotally secured to the end of one leg of the
U-shaped member 25. The cam follower 24 is
The contact 35 is connected by a line
59 to the coil of the electromagnet 3i and the
contact 4!)‘ is connected by a line 5| to the coil
of the electromagnet 3!), The line M is also con?
nected to the movable element @311 of the rheostat
£33. A resistance element 431) of the rheostat is
20
held to the surface of the cam 23 by a spring 26
connected to the coil of'the electromagnet 28 by
acting between the leg of the U~shaped member
a line 52, and a similar resistance element 430 is
20 and‘ the arm 25. ‘ The cam and camfollower
connected by a line 53 to the coil of the electro
constitute a connection through which thou
, thereof.
magnet 21.
shaped member 29 is normally maintained sta
tionary with respect to the trunnions Hi and IS. 25
The cam connection provides a relief for move
ments of these elements upon the application of
34 will engage either the contact 39 or 40, de
pending upon the direction in which the gyro
scope tilts‘ The engagement of one or the other
of these contacts will energize either the magnet
30 or 3! and effect aprecessional force on the
armature S2 and thus on. the trunnion I8. This
returns the ring l6_ andthe U-shaped member
20V to positional agreement when such condition
The axis of the trunnions I3
and i9 is parallel to the axis of rotation of the
range ?nder A.’
. v
'
"
'
'
precessional force ,Will be applied in a direction
The precessional force applying means H and
to cause the gyroscope to process about the trun
' nions l4 and I5 in a direction to bring the pendu
lum 34 to a neutral position between‘ the con
2! are shown in detail in Fig. 3. The preces
sional force applying means I‘! consists of the
casel‘l' that is mounted upon the ring l6 and
tacts, and thus bring the gyroscope axis to the
effective vertical about axis l4—! 5. The rheostat
I53 may be operated manually to effect a preces
two arcuate electromagnets 21’ and 28' mounted
On the trunnion [4 extending
1
'
fromithe gyroscope, there is mounted an arma
within the case.
sional force on the armature'22. The rheostat 43
is, in the operation of the mechanism, set man
ually to take care of unbalance of the gyroscope,
friction at the sensitive bearings, and the earth’s
rotation.
The U-shaped element 253 carries an arm 290
ture‘ 29 which cooperates with the opposed elec
tromagnets 21 and 28. It will be seen that when
' th‘e' el'ectromagnet' 2'8 is‘energized a force will'be
exerted'on the armature 29 proportional to the
energizing current of the magnet 23; Likewise,
when the magnet 21 is energized there will be
a. force on the armature 29 opposite in direction
to the force on the armature which the magnet
28 produces; It will be understood of course that
the armature 29 does not move under the influ
ence’ of these magnets since in accordancewith
‘the phenomena of the gyroscope when a force
is appliedto the gyroscope about one axis,'the
gyroscope processes about an axis perpendicular
to the axis about which the force isvapplied. The
precessional force applying means 2! is identical
in all respects with the precessional force apply“
ing means 21 and includes similar electromagnets
38‘ and 3| and‘ an armature 32 positioned to coop
erate with the magnets and mounted upon the
that extends out from the gyroscope support 13
over the range ?nder A to a position above the
follow-up mechanism C.
cated end section 26d. Pivotally secured to the
pin 20c, there is a rod 54! which. constitutes the
5 control rod for the follow-up mechanism C. The
follow-up mechanism C is such that movement
of the rod 54, which requires practically no force
to be moved and consequently does not place any
reacting precessional force upon the gyroscope,
60 e?ects movement of a power-actuated plunger rod
55 that is secured to the range ?nder A through
a‘ strap 55 mounted on and secured to the range
?nder against relative rotation with respect there
to. The strap 56 has a bifurcated bracket 56a
extending therefrom and radially of the range
finder. In'this bifurcated bracket, there are jour
naled trunnions 55a and 551) which extend from
The precessicnal force applying means 2| is '
controlled by an inverted pendulum arrangement
553 that is mounted upon the case of the gyro-l
scope H1? This inverted pendulum is shown in
detaillinr'Fig. 3 and consists of a mass as mounted
The arm the has a bi
furcated end 28d which carries a pin Etc extend
ing across and secured to the arms of the bifur
trunnion :8 extending from‘ the ‘gimbal ring l5.
upon a leaf spring or reed 55 that is ?rmly se
'
tilts‘ about the t'runnions l4 and I5, the pendulum
opposing forces to these elements and, being a
constant rise cam, upon such relative movement
ceases to exist.
r
From the above diagram, it will be seen that
whenever the gyroscope, by virtue of unbalance,
frictional forces, or the rotation of the earth,
' ~ diametrically opposite sides of the plunger 55.
'It is through these trunnions and the bracket 55
that the range ?nder is, rotated about its longitu
dinal axis by the plunger rod 55.
p The projections of the axis of the range ?nder,
"the axis l8V-V—l9 of the gyroscope, the pivot pin
ate with‘ contacts 55 and M! mounted respec~
20c and the trunnions 55a and 55b onto a plane
tively upon‘metal strips 4! and 42 extending from
and secured to opposite sides of the block 35. The 75 perpendicular to the axes of the range ?nder form '
cured in a block 36 mounted on the ocaseof the
gyroscope. The mass 34, at its upper end, carries
two electrical contacts 3? and 33 on opposite sur
faces‘ thereof. These contacts Hand 38 cooper
to
2,405,051';
5
the intersections of lines forming a parallelogram.
That is to say, the U-shaped element 20 and rod
chamber 80 in the piston rod 55. The valve 19
200, the rod 54 and the radial arm 55 form a
has a reduced section 19a and a reduced hollow
extension 1%. Radial passages 190 at the re
parallel motion linkage. The gyroscope axis
I4—-l5 is thus maintained parallel with the line
duced section 19a communicate with the interior
of the hollow extension 19b which also communi
of sight on a surface target.
cates with the passage in the arm 6! a and thus
The arrangement of the hydraulic follow-up
the exhaust passage 69. A port 8! controlled by
mechanism is illustrated in detail in Fig. 2 of the
the valve communicates with the chamber below
drawings. The rod 54 extends through a longitu
the piston through a passage 82 in the plunger rod
dinal opening in the plunger rod 55 and is con 10 55 and piston 59. Oil under pressure is delivered
nected to a piston valve 51 that is slidably mount~
to the valve chamber 58d through a passage 83
ed in a combined plunger and piston valve 58.
communicating with the chamber above the pis
The plunger 58 is mounted in a central bore of i
ton 59 and the oil acts on the annular surface of
the plunger rod 55. The plunger 55 has on its
the shoulder 19d of the valve formed by the re
' lower end a piston head 59, one face of which 59a. 15 duction of the valve to form the extension 19b.
is one-half the area of the opposite or lower face
The area of the surface 19d is equal to one-half
5912. It is from the face 5911 that the plunger rod
of the end surface 196 of the valve 19 on which
55 extends and this plunger reduces the area of
oil under pressure acts to oppose the pressure of
the face 59a. The plunger 55 and the piston 59
the oil on the surface 19d. The oil between
20 the valve 19 and the plunger 58 is thus maintained
thereon are mounted in a block 65.
The block 59 forms a cylinder for the piston 59,
at a pressure of one-half the pressure of the sup
and a block 6| on which the block 69 is mounted
ply. It will be seen that when the valve 19 is
forms an end wall for the cylinder. The block
moved downwardly from the position shown in
5| is pivotally mounted on a shaft 62 that is
Fig. 2, the port 8| will be placed in communica
mounted in brackets 63 and 64. Within the block 25 tion with the exhaust and the pressure in the
6| there is a relief valve chamber 65 and a con
lower'chamber will be reduced and the piston 53
stant pressure valve chamber 56. A lateral hollow
will move downwardly. Likewise, if the valve is
arm 61a extends from the surface of the block 6i
moved upwardly from the position shown, the
and into a bore 61 in the piston 59. Oil under
port 8| will be placed into communication with
pressure is introduced into a passage 68 formed 30 the passage 83 and oil under pressure will ?ow
in the end of the shaft 62 mounted in the bracket
through the passage 82 to the lower chamber and
-64, and the oil passes from the follow-up mech
effect an upward movement of the piston 59.
Movement of the valve 19 follows movement
anism through an exhaust passage 69 formed in
the opposite end of the shaft 62. The passage 68
of the plunger 58 which is controlled by the valve
communicates with a circumferential groove ‘III 35. 51. The valve 5'! has two reduced sections 51a
and 51b and this valve controls communication
in the block 6| which also communicates with a
between ports 58a, 58b and 580 in the plunger 58.
passage ‘H in the block 60 and a passage 12 in the
The plunger 58 has two reduced sections 5812
block 6|. The passage ‘I2 is connected in par
and 58e. The port 58b communicates with a
allel to the valve chambers 65 and 66. In the
chamber 84 above the plunger 58 through a pas
valve chamber 65, there is a valve 13 that controls
sage 58]‘. The port 58a communicates through
communication between the passage 12 and a pas
a passage with the chamber formed by the re
sage 14 communicating with the chamber below;
duced section 58d of the plunger and through
the piston 59. The valve 13 has a longitudinal
that chamber with a passage 85 that communi
passage 13a that communicates with radial pas
sages ‘I3b. A spring 15, surrounding a limiting 45 cates with the passage 83. Oil under pressure
is thus delivered to the chamber formed by the
pin 13c extending from the end of the valve, acts
reduced section 58d through the passage 85. The
to move the valve to the right, from the position
port\58c communicates with the chamber formed
shown in Fig. 2, to place the radial passage 13b
by the reduced section 586 which in turn com
in alignment with the passage ‘M. The valve is‘v
moved against the action of the spring to the po 60 municates with a passage 86 through the plunger
or piston rod 55, The passage 86 also communi
sition shown by oil under pressure in the pas
cates with the chamber formed by the reduced
sage 12.
.
section 19a of the valve .19 and through the radial
A constant pressure valve 15 is slidably mount
ed in the valve chamber 66. The pressure of the
oil in the passage ‘[2 acts against the action of a
spring 11 to move the valve to the left from the
position shown. The valve 16 has a longitudinal
passage 16a and a radial passage 16b communi
passages 190 of the valve 19 with the exhaust
passage 69. A passage 58g connects the chambers
' formed above and below the vvalve 51 in the
plunger 58 so as to permit free movement of the
valve.
From the description of these ports and pas
cating with the passage 16a. When the valve is
moved to the left from the position shown, the 60 sages and the valve 5‘! it will be seen that if the
valve 51 is moved upwardly from the position
passage 12 is placed into communication with a
shown in Fig. 2, the port 580 will be placed into
passage 18 connected to the exhaust passage 69.
communication with the port 58?). Oil under
In this way the oil in the passage 12 is maintained
pressure will thus ?ow fro-m the chamber 84 to
‘
Oil under a constant pressure is thus supplied. 65 the exhaust and since the plunger in the cham
ber 85 is raised, the pressure of the oil between
through the passage ‘H to the chamber above the
the plunger 58 and the valve '69 is slightly re
piston and acts to move the piston downwardly in
duced and the pressure acting upon the surface
the cylinder. The action of the oil on the upper
l'iid of the valve 19 will cause the valve 19 to
surface of the piston is resisted by oil inthe
chamber below the piston and movement of the 70 move upwardly following the movement of the
plunger 58 with the result that the piston 59 in ‘
piston 59 and its associated plunger or piston rod
the manner heretofore described will move up
55 is controlled by admitting oil under pressure
wardly. The movement of the plunger 58 will be
to and exhausting oil from the chamber below the
equal to the movement of the valve 51 since as
piston 59. For this purpose, there is provided a
hydraulically operated valve 19 mounted in a i the plunger moves upwardly it will reach a po
at a constant pressure.
2,405,05r
71
is formed as a handle and the lower end of the‘
lever has a pin 94 extending therefrom. To this
pin a rod 95 is connected which is connected to
the clutch 6 and upon movement of the handle,
from the position shown, to the left, the rod 95
effects the engagement of the clutch 6.
Also connected to the pin 94 there is a valve
sition in which communication between the ports
58b and 580 will be cut off and there will be no
further movement of the plunger 58. Due to the
hydraulic connection of the ?uid in the chamber
above the valve surface ‘Ite, the movement of
the valve ‘I9 and the piston 59 will be equal to
the movement of the valve 57.
When the valve
51 is moved downwardly the port 58b is placed
into communication with the port 58a‘ and oil
under‘pressure flows to the chamber 84. ' The in
crease in pressure in the chamber 85 causes a
rod 96 which operates a valve 91 mounted in a
valve block 98. The valve 91 may be termed a
10 selector valve and is for the purpose of cutting
out the operation of the hydraulic follow-up.
The valve 91 and its interconnection with the
downward movement of the plunger 58 and
system is shown in detail in Fig. 2. This valve
through the ?uid between the plunger and the
is ‘a piston valve having a reduced section 99a
valve 19 effects downward movement of the valve
‘I9. The movement of the plunger 58 and valve 15 of su?icient length to connect ports 91a and 91b
in the valve block. The ports 91a and 911) are
‘59 will correspond to the movement of the valve
connected across the pump I2 so that when these
57. The piston 5;‘? will likewise be caused to move
two ports are in communication the pump is
in proportion to the movement of the valve 5?,
short-circuited, that is, the high pressure side of
as described above.
7
the pump is connected to the exhaust side of the
With this arrangement there would
a slight
pump and oil under pressure is not delivered to
lag between the movement of'the valve 51 through
the hydraulic follow-up mechanism. This con
the valve stem 54 and the movement of the range
nection is illustrated diagrammatically in Fig. 2
?nder when the piston 59 had appreciable ve
wherein the broken line Is0 indicates a line of
locity. This is due to the opening of port 8 I , and
consequent movement of both 79 and 58 from 25 passages which are connected to the exhaust side
of the pump and the solid line 'IOI indicates a
their neutral positions, to pass the oil into or from
line of passages connected to the high pressure
the chamber below the piston 59. In order to
side'of the pump. It will be observed that the
remove this lag there is provided an advancing
high pressure side of the pump connects with
valve iii; The advancing valve 81 is a needle
the passage 60 and the low pressure side of the
valve and the needle valve controls communica
pump connects with the passage 69 in the hy
tion between a port 88 formed in the plunger rod
55 and 'a passage 39, the passage 89 communi
draulically operated follow-up; Likewise, the line
IOI connects with the port 91a of the valve block
cating with the port 88 and the chamber between
91 and the line I00 connects with the port 911).
the plunger 58 and the valve ‘I0. Upon move
ment of the plunger 58 the port as is placed into 35 When the valve is in theposition illustrated in
Fig. 2 the port 91b is cut off from communication
communication with the chamber formed by the
with the port 9111. Consequently oil under pres
reduced section 5S0! or the chamber formed by
sure is supplied for the operation of the follow
the reduced section 53c of the plunger 58 depend
up mechanism. When the lever 90 is swung
ing upon the direction of movement of the plunger
from a neutral position. If the plunger moves 40 about its pivot to the left from the position
illustrated, the valve 91 is moved to the right
upwardly the chamber formed by the reduced
from the position shown in Fig. 2 and the port
section Etc is placed into communication with
91a is'placed into communication with the port
the port 58 and oil ?ows from the chamber be
9117. The pump is thus short-circuited and the
tween the plunger 58 and the valve is to the.
exhaust passage 05 thus reducing the pressure 4,5 hydraulic follow-up mechanism does not operate.
It will be observed that when the selector Valve
in this'chamber and augmenting the effect of the
is moved so as to cut out the hydraulically op
upward movement of the plunger. On the other
erated follow-up, the valve 73 moves to a posi
hand, ifthe plunger moves downwardly the .port
tion to place the passage ‘I4 and consequently the
38 is placed into communication with the cham
ber formed by the reduced section 58d and oil 50 chamber below the piston 59 into communication
with the passage ‘I2. Oil in the chamber'below
under pressure ?ows from the pressure port 581a
the piston ‘I9 thus flows from this chamber and
to the chamber between the plunger 58 and the
does not present any resistance-to the manual
valve ‘Id thus causing the valve ‘l9 to move down, '
. operation of the range ?nder.
further than it otherwise would if the effect of
When the selector valve is operated so as to
the plunger 58 were not augmented by this in 55
provide for the manual operation of the range
crease in ?uid ?owing into the chamber between
?nder, the gyroscope is captured to prevent a
the plunger 58 and the valve ‘I9. The valve 8?
free swinging movement of the gyroscope; The
is set arbitrarily to produce the most satisfactory
mechanism for capturing the gyroscope is illus
conditions for the particular installation.
It will be apparent that the piston rod 55 and 60 trated in Fig. 1 and consists of two L-shaped
levers I02 and I03. The L-shaped lever I02 is
consequently the range ?nder, are thus moved in
mounted to swing about a pivot I04 in the gyro
accordance with the movement of the valve stem
scope support and the lever I03 is mounted to
or rod 54 and consequently in accordance with
move about a pivot I05. At approximately the
the movement of the gyroscope relative to its
support. Since the gyroscope is stable in space, 65 apex of the angle formed by the arms of the
the range ?nder will be moved relative to its
lever I02, this lever is pivotally secured to an
L-shaped bar I00 and the lever I93 is similarly
support so that it remains stable in space about
pivoted to this bar I06 at IIl?a. The bar I06
its axis.
To selectively connect the range ?nder for
is slidably mounted on the gyroscope support for
manual operation through the handle 8 or to
movement longitudinally of the long arm I06b,
thereof.’ A spring I01 urges the bar in a direc
effect the automatic stabilization by the gyro
tion such as to move the arms Hi2 and I03 about
there is provided a manual lever 96. The lever
their pivots I04 and I05 in a direction which
is mounted upon a shaft SI that is journaled in
closes‘the gap, between these arms. A pin “a
bearings 92 and 93. The upper end of the lever. 75 extending downwardly from the gyroscope ex
scope through the mechanism described above, ‘
2,405,051
9
tends between the arms I02 and I03 and when
the bar I00 moves under the action of the spring
Hi‘! the arms I03 and I04 move about their pivots
and clamp the pin He, thus capturing the gyro
scope.
The arms I02 and I03 are moved in the
opposite direction by a plunger I08 illustrated in
detail in Fig. 2.
The plunger I 08 is slidably mounted in a block
I00 mounted in the gyroscope support. When the
selector valve is moved to the position shown in
Fig. 2, oil under pressure is admitted to the block
I09 behind the plunger I08 and forces the plunger
outwardly of the block. The plunger rod I 0811
is connected to one end of a lever I09’ that is
10
comprising a gyroscope support mounted adjacent
the range ?nder, a gyroscope mounted in the sup
port for movement about an axis parallel to the
axis of rotation of the range ?nder and an axis
perpendicular thereto, and means for effecting
rotation of the range ?nder in accordance with
relative movement of the gyroscope and its sup»
port about the axis parallel to the axis of rota
tion of the range ?nder including a cylinder piv
otally mounted about an axis parallel to the axis
of the range ?nder, a plunger Within the cylinder,
an arm connected to the range ?nder and the
plunger, a valve within the plunger for controlling
the ?ow of hydraulic medium to the cylinder, and
means for actuating the valve relative to the
plunger in accordance with movement of the gyro
pivoted at III) and the other end of the lever is
connected to a pin III extending from the bar
scope.
I06. Outward movement of the plunger I08 ef
3. In a stabilizing mechanism for stabilizing a
fects movemet of the bar I00 in a direction
range ?nder mounted upon a movable platform
opposite to that in which the spring I01 tends to
and rotatable about its own axis, the combination
move it. When the selector valve is positioned 20 comprising a gyroscope support mounted above
so as to supply oil under pressure, the plunger
the range ?nder, a gyroscope mounted in the
I08 is thus actuated to move the levers I02 and
support for movement about ‘an axis parallel to
I03 about their pivots and release the pin IIa
the axis of rotation of the range ?nder and an
extending from the gyroscope.
axis perpendicular thereto, the gyroscope being
25
From the above description of the embodiment
mounted so that its spin axis intersects the axis
disclosed in the drawings it will be seen that the
mechanism herein disclosed is suitable for sta
bilizing a range ?nder or any other object in
level, that is, about an axis perpendicular to the
line of sight. In operation, as the ship rolls, the
of the range ?nder, and means for effecting rota
tion of the range ?nder in accordance with rela
tive movement of the gyroscope and its support
about the axis parallel to the axis of the range
?nder including a cylinder pivotally mounted
person operating the range ?nder may, as he
about an axis parallel to the axis of the range
picks up the target on the roll of the ship, throw
?nder, a plunger Within the cylinder, an arm
the lever 90 into the automatic control. If this
connected to the range ?nder and pivotally se
is done the range ?nder will become stabilized
cured to the plunger, a valve within the plunger
35
on the target and become independent of the roll
for controlling the flow of a hydraulic medium to
of the ship.
the cylinder, a valve stem, and an arm pivotally
It will be obvious that various changes may
mounted about the axis of ‘the gyroscope and
be made by those skilled in the art in the em
movable therewith and pivotally secured to the
bodiment of the invention illustrated in the
stem.
drawings and described above within the prin 40 valve
4. In a stabilizing mechanism for stabilizing a
ciple and scope of the invention as expressed in
range ?nder mounted upon a movable platform
the appended claims.
and rotatable about its own axis, the combination
We claim:
'
comprising means for stabilizing the range ?nder
1. In a stabilizing mechanism for stabilizing a
including a gyroscope support mounted adjacent
range ?nder mounted on a movable platform and
the range ?nder and movable about an axis par
rotatable about its own axis, the combination
allel to the axis of the range ?nder, a gyroscope
comprising a gyroscope support mounted ad
mounted in the support for movement about an
jacent the range ?nder, a gyroscope mounted in
axis perpendicular to the axis of movement of
the support for movement about an axis parallel
the support, means for applying a precessional
to the axis of rotation of the range ?nder and an :
force to the gyroscope to effect precession of the
axis perpendicular thereto, and means for effect
gyroscope about its axis of movement and con
ing rotation of the range ?nder in accordance
trol means therefor including a pendulum, means
with relative movement of the gyroscope and its
for applying a precessional force to the gyroscope
support about the axis parallel to the axis of ro
tation of the range ?nder including a cylinder , to effect precession of the gyroscope about the
axis of the gyroscope support and manually op
pivotally mounted about an axis parallel to the
erative
control means therefor, power-actuated
axis of the range ?nder, a plunger within the
means for effecting rotation of the range ?nder
cylinder, an arm connected to the range ?nder
and control means therefor operated by move
and the plunger, and means actuated by move
ment of the gyroscope support relative to said
ment of the gyroscope for controlling the flow of
hydraulic medium to the cylinder.
2. In a stabilizing mechanism for stabilizing a
range ?nder mounted on a movable platform and
rotatable about its own axis, the combination
platform.
EDWARD J. POI'I'RAS.
JAMES D. TEAR.
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