close

Вход

Забыли?

вход по аккаунту

?

код для вставки
235M416
KR
I
1 294139573
I,
w
.W‘L-‘R W‘
.
Dec. 31, 1946.
7”“Myu
E. E. LIBMAN
2,413,573
FIRE CONTROL SYSTEM
Filed Aug. 21, 1944
_
s Shéets-Sheet 1
Fig l
Ix Vt COST
INVENTOR.
-~ '—54RL {LL/BMAN"
ATTORNEY
~~——— -— —~
Dec. 31, 194-6.
E, E_ UB‘MAN
2,413,573
FIRE CONTROL SYSTEM
Filed Aug. 21, 1944
3 Sheets-Sheet 3
= ~3
INVENTOR.
EARL E Ll BMAN
‘ATTORNEY
?
2,413,573
Patented Dec. 31, 1946
UNITED STATES PATENT OFFICE
2,413,573
FIRE CONTROL SYSTEM
Earl E. Libman, Brooklyn, N. Y., assig‘nor to Con
trol Instrument Company, Inc., Brooklyn, N. Y.,
a corporation of New York
Application August v2.1, 1944, Serial No. 550,466
~ 6 Claims.
1
This invention relates to improvements in ?re
control systems and has particular reference to
a computer and method of operation especially
adapted for use in surface ?re from a moving
ship to a moving target.
It is proposed, by the present invention, to ob
tain improved accuracy of ?re by manually set
ting in the instrument the own ship and target
speeds, the relative target bearing and target
angle, the range, and the wind velocity and hear
ing, and to read the values of sight angle and
sight de?ection resulting when the said various
inputs have been introduced in the instrument,
said values being then set in the gun sights, with
the addition of spot corrections if desired. While
?re control instruments have been heretofore
designed for somewhat similar purposes, they
have been highly complicated and costly mech
(Cl. 235-615)
2
.bodiment-of the inventive idea; but it is to be
expressly understood that said drawings are em
ployed only for the purpose of describing the in
vention as a whole and not to de?ne the limits
thereof, reference being had to the appended
claims for this purpose.
In the drawings:
Fig. 1 is a diagrammatic view illustrating the
method of resolving the components of motion
in the fire control problem.
Fig. 2 is a similar view illustrating the present
position of the target relative to the own ship.
Fig. 3 is a diagrammatic view illustrating the
resolution of the wind correction to be applied.
Fig. 4.is a view illustrating the method of con
15
structing a chart giving sight de?ection as a
function of average shell velocity and bearing
anisms, which are not portable and are incapable
of use by other than highly trained personnel. ‘
Accordingly, an object of the invention is to
provide an improved ?re control system of com
paratively simple and inexpensive construction,
employing calculating elements and associated
mechanisms capable of easy assembly and adjust 25
ment in a very compact, light and portable com
puter, and wherein no backlash or lost motion
rate.
Fig. 5 is a plan view of a wind correction
chart employed in connection with the inven-_
tion.
Fig. 6 is a fragmentary plan view of a chart
displaying present range, and used to produce
average shell velocity.
.
Fig. '7 is a fragmentary plan view of a chart
displaying sight angle as a function of average
shell velocity.
‘
Fig. 8 is a plan view of a chart displaying spot
will develop in any of the essential calculating
corrections in range, and
elements or their operating mechanisms.
Another object is to replace the complicated 30 Fig. 9 is a schematic diagram in perspective
showing all the essential features of the inven
calculating mechanisms usually employed by pro
tion.
viding in lieu thereof, novel forms of charts and
To aid in a complete understanding of the
curves which greatly simplify the computations,
invention,
the method of mathematically estab
so that they will not be difficult to read or under
stand, thus enabling the instrument to be con 35 lishing the procedure of calculating sight angle
and sight de?ection from the given inputs of
veniently operated by personnel having less ex
relative target bearing, own ship speed, target
perience than that usually required for ?re con_
angle, target speed, present range, wind bearing
trol instruments of known types.
and wind velocity, will ?rst be explained. These
Another object is to provide for the addition
of spot corrections in sight de?ection and in range 40 quantities will be de?ned by reference to Figs. 1
to 3, and, as will be seen, the mathematical
without disturbing the other settings of the in
relationship derived will permit. the solution of
strument.
the ?re control problem by the use of simple
A further object is to maintain extreme ac
charts, rather than by the usual expensive and
curacy in the instrument without the use of ac
-—eurately_ mechined_parts_or_tedious and dif?cult
adjustments. Such accuracy is obtained by the
novel arrangement and control of charts provided
in the ‘instrument, and is determined primarily
by the accuracy of the input quantities set in
the instrument, rather than by any limitations
established by the instrument itself.
The above and other objects will appear more
clearly from the following detailed description
when taken in connection with the accompany
ing drawings, which illustrate a preferred em
The methods employed in constructing the charts
based on these mathematical relationships will
be next explained by reference to Figs. 4 to 8,
and ?nally the method of utilizing the charts
in the complete invention will be illustrated by
Fig.9.
In Fig. l, the own ship is proceeding at a speed
of V0 knots.
The position of the target relative '
to the own ship is indicated by the relative target
65 bearing B and'the present range R. The target
2,413,578
3
4
is proceeding at a speed Vt and the target angle
the cross wind component is seen to be given by
is 1'.
the expression W sin (B—w) .
The angles B and -r are measured clock
wise from the bows of the ship to the line of
If D’ is the corrected de?ection,
D'=D+¢w—a where ¢w is the cross wind cor
rection and 5 the drift correction, expressed as
angular corrections to the deflection D. Drift cor
rection is obtained from a standard U. S. Navy
data table and as the drift is always to the right,
its correction is always subtracted, hence —6.
sight. The components of relative speed between
the own ship and the target are found by re
solving the speed of each ship into components
along the line of sight and across the line of
sight. Addition of these components with the
proper signs will give the range rate and the
linear bearing rate.
10
Range rate R will be assumed positive when
the range is increasing. The compass bearing
30 of the target is equal to B plus own ship’s
course, designated by CS0. The linear bearing
Since ¢w—5 does not exceed 2.8°, its cosine can
be assumed equal to unity, and its sine equal to
rate RBc will be assumed positive when the 15 the angle. As cos D has also been assumed equal
target is apparently moving toward the right,
to unity,
that is, when the line of sight is rotating clock
wise as viewed from the own ship.
If u is the angular correction for cross wind of
Expressing V0 and Vt in yards per second and
expressing the time rate of change of any quan 20 unity velocity, uW sin (B—w) is the correction for
wind of velocity W sin (B-—w) and thus
tity by placing a dot over the character desig
nating it, the range rate is
(1)
R=—V0 cos B——Vt cos 1'
[6 Cl
The linear bearing rate is
(2)
RBc=vo sin B-i-Vt sin 1
Fig. 2 illustrates the method of solution of the
problem. The own ship and target are respec
tively at positions 0 and T when the gun is ?red.
the intervening present range being R. V is the
velocity of the target relative to the own ship, and
(7)
Sin D,=12% muW sin (B—w)
m
where for brevity $==RBc+muW sin (B—w) —ma.
The method of employing the equations in the
mechanism can now be indicated. By resolving
tse own ship’s and target’s speed along and per
pendicular to the line of sight by means of re
solvers and adding the components appropriately,
has components R and R130 which are measured
respectively along and perpendicular to the line
of sight. During the time of ?ight Ta. of the shell, ‘
the apparent relative motion of the target will
cause it to move to some position T’. Triangles
I and 2 are similar, the sides of triangle 2 being,
R and R30 can be obtained from Equations 1
and 2.
Since Ta depends upon m, the R and R thus
determined can be employed to ?nd _m from (6).
As previously described, m is de?ned as being
equal to Ra/Ta. The standard U. S. Navy range
angle I. It is required to ?nd the sight de?ection 40 tables for surface guns list the corresponding
values of Ra and Ta. By dividing each Ra by its
D between the line of sight and the line of ?re,
corresponding Ta, there is obtained the corre
and the sight angle or angle of elevation of the
respectively, Ta times as large as the sides of tri
gun above the horizontal at the advance range Ra.
From Fig. 2 it is seen that
sponding m and from this a table may be formed
having values of Ta corresponding to m for a gun
(3)
Ra sin D=RBcTa
(4)
R11 cos D=R+RTa
if m is known, To is known and is a function of m
and Equation 6 may be written as
having a, speci?c known muzzle velocity. ‘Thus,
+12
Since the sight deflection D does not ordinarily
reach a value of more than about six degrees, 50
cos D may be assumed equal to unity without in
Therefore, only R, R and m are involved in said
troducing appreciable error.
average velocity
Designating the
equation and so, for any pair of R and R, the value
of m is determined and can be calculated. Having
the value of m, the observed value of the wind ve
Hi
Ta
of the shell over its trajectory by m, and putting
cos D equal to unity, these become:
locity and of the wind direction, the quantity
muW sin (B—w) can be obtained. The quan
tity m6 can also be determined from m. Thus all
the quantities in ('7) are determined and the value
60 of the corrected sight de?ection D’ can be found.
As sight angle is a function of range or of m, it
can be found from m.
Differentiating the equation,
.
.
Fig. 3 illustrates the method of resolving wind.
.
..
._._
_.
M
s
SIBsD
,_z__
jmmss
.1
n
gives
A correction for cross wind only is made in the
apparatus. The correction for wind in the line of
cos D’ AD’ =92
m
?re isneglected. The angle to between the bow of
the ship and the direction from which the wind 70 Since D’ is never greater than about 8°, cos D’
of velocity W is blowing is called the relative di
can be assumed equal to unity, which will reduce
rection of the apparent wind. Although the wind
the equation to .
should be resolved across the line of ?re, negligible
error and appreciable simpli?cation result from
resolving it across the line of sight. From Fig. 3 75
2,413,573
5
tion Ax=mAD’ is in the same form as
cv=m sin D’
0d of adding spot corrections to sight de?ection.
An increase in D’ to D’+AD' can be expressed as
.
(s)
'
6
The equation for spot correction in sight de?ec
This equation may be used to establish a meth-'
which was represented by Fig, 4, and therefore
I
sin (D'+AD’) 43%?!)
can be shown on a similar chart.
Referring to Fig. 9, the numerals II and I2 in
AD’ lies between :25 mils or :1.5° and its cosine
dicate graduated dials of own ship and target
lies between 10.9997 and, for purposes of the
resolvers, respectively, between which extends the
present invention, is taken (with very small error)
line of sight I3. In order to set in the given rela
to be unity and, therefore, with a high degree of 10 tive target bearing data on the peripheral degree
accuracy, AD’ may be assumed equal to the sin
scale of the dial I I, a knob I4 on the panel of the
AD’. Thus to add the spot correction AD’, the
instrument is connected to said dial by the gear
quantity mAD’ is added to 0:.
I5. A second scale I6 radially arranged on the
To add a spot correction ARa to the advance
dial II is graduated in knots of ship’s speed with
range Ra, it is necessary only to select a value
0 speed at the center of the dial. For the pur
of sight angle which corresponds to Ra+ARa, or
pose of setting in the target angle 1' in the target
to m+Am, Where Am is the change in m corre
resolver, the dial I2, also having a circular degree
sponding to ARa. Since m by de?nition is Ra/Ta
scale, is rotated by means of a gear I ‘I operated
and Ta itself depends on Ra, so does m=Ta/Ra
by the knob I8. Said dial I 2 is also provided with
and Ra depends on m or the quantity Ra is a 20 a radial scale I9 similar to the scale 16.
function of m, or Ra=F1 (m) , andAlga=F? m) Am
. .Associated with own ship dial II and arranged
or
above the same are two overlapping strips 20 and
_
2I of transparent material, having, respectively,
ARa
the cross hairs 22 and 23. The strip 20 is arranged
Am- F20”)
NJ Li
Thus, sight angle at Ra-l-AR may be expressed as
(9)
'
~-
.
_
._1i"__
Sight angle - F-m V.“ Fawn.)
parallel to the line of sight I3, while the strip 2|
is disposed across the line of sight and at right
angles to the strip 20. One end of the strip 20
is ?xed to a follower nut 24 through which ex
tends a screw 25 geared to a handle 26, so as to
move the nut; 24 along the screw and thus ad
It is evident that ('7) can be written as
ar=m sin D’
which for given values of D’ is the equation of a
straight line passing through the origin of a set
of axes along which :r and m are measured. This
is illustrated in Fig. 4, where these straight lines
are plotted for various values of D’ marked on
the lines. Thus for any pair of values of m and
a: which are computed from the given data and
the chart moved to the corresponding position,
the sight de?ection D’ can be read from the curve
to which the pair corresponds.
From standard range tables the values of unit
just the strip 20 when said handle is rotated.
Similarly, the strip 2I is carried by the follower
nut 21 mounted on the screw 28 geared to the
handle 29. After the dial II has been adjusted
to indicate the relative target bearing, the own
ship velocity is indicated on the scale I6 by ad
justing the two strips 20, H by amounts equal to
the own ship's components of speed across the
line of sight and in the line of sight, until the
cross hairs 22. 23 intersect on said scale at the
given value of the own ship's speed. Like the dial
I I, the dial I2 also has associated therewith trans
parent strips 30 and 3| carried, respectively, by
wind correction u can be obtained for various
the follower nuts 32 and 33 mounted on the
values of m and corresponding values of am may 45 screws 34 and 35, with the former geared to the
be calculated. At a given wind velocity W, the ‘ handle 36 and the latter to the handle 37. Thus,
quantity muW will depend upon W and m, and
if curves are plotted of the quantity 7=muW for
various values of ‘Y against axes W and m, the
after the dial I2 has been set to the given target
angle 1', the overlapping strips 30, 3I are adjusted
until their respective crosshairs 38, 39 intersect
curves of Fig. 5 are obtained. The values of A/ or
muW are shown on the curves. Since the curves
on the scale I 9 at the given target speed, said tar
are multiples of each other, the chart Fig. 5 is
essentially a multiplying device, from which mul
tiple values of muW can be read.
vation and the employment of standard'means
existgileflnite value 0fWsi_gh't angle. Fig. '7 illus
morahlapuney 1.1.2, theshaitiii of much is. car_1:ied__*
trates a chart or tape on which sight angle is
by a bar 44 slidable in guides 45. A tension spring
shown as a function of m.
46 is secured to the bar 44 so as to maintain
get angle and speed being obtained by obser
for estimating the same. As with the own ship
dial II, said cross hairs move by amounts which
Since 112. and Ta are related or dependent
are equal to the components of motion of the tar
quantities in the Equation 6
get in the line of sight and at right angles thereto.
The components of own ship and target speeds
in the line of sight e?ected by the adjustments
above described, are added or combined in order
‘ it appears that curves may be plotted of various 60 to obtain the range rate R. To accomplish this,
values of present range R against axes of m and
a ?exible element 40 in the form of a steel tape,
R. Fig. 6 is a portion of a chart giving curves
wire, or the like, has its ends secured to the fol
lower nuts 27 and 33, and its intermediate portion
of present range R as a function of m and R.
is extended around a ?xed idler pulley 4| and a
For any given value of m or of m-l-Am there will
The equation for range spot correction
-
a tension upon the tape 40 at all times regard
less of the position of the follower nuts 21, 33.
A
70 With this arrangement, a motion of either nut
through a given distance will cause the pulley 42
to move through half that distance. Therefore.
indicates that curves may be plotted of various
a transparent strip 41 carried by the movable bar
values of ARa against aXes of Am and F2(m).
44 and having the cross hair 41’, will‘ be moved
Fig. 8 is a-chart giving curves of ARa as a func
75 by an amount'which is equal to half the sum of
tion of m and Am,
2,413,573
7
8
the motions of said follower nuts 21, 33, These
motions imparted to the transparent strip 41 rep
resent the range rate R which will be employed
which is mounted the range spot chart 15'.
Worm 86 mounted on said shaft 80 engages with
gear 81 on shaft 89 to drive the attached wind
correction drum 16.
in the calculation of future or advance range and
The range spot chart 15' described with refer
average shell velocity to be obtained from the 5
ence to Fig. 8 is wrapped on the range spot drum
chart 48 (Fig. 6) over which the strip 41 is adjust
15, the m axis extending circumferentially around
able. Said chart is movably mounted upon an
the said drum. Thus rotation of the said drum
adjusting unit consisting of upper and lower pairs
in accordance with the given value of m will bring
of rollers 49, 50, and 5|, 52, respectively, with the
the said chart to the correct position under the
ends of the chart extended around the lower roll
ers and the intermediate portion extended over
the upper rollers so that the chart will be rolled
up on one or the other rollers in accordance with
the direction of rotation of the drive roller 49,
which carries sprocket teeth 53 at each end en
gageable in openings formed in the edges of the
chart. . Said chart is maintained taut on said
rollers by a constant tension exerted on the roller
5| by a spring 54 coiled on the shaft of said roller.
axially movable cross hair 90, which is carried
upon and moved by the nonelastic wire or tape
9|. One end of said tape 9| is attached to the
clock spring unit 92, which tends to rotate in the
direction shown, thereby producing tension in
said tape. From said spring unit 92, said tape 9|
is led successively over idler pulleys 93, 94, 95 and
96 and is wrapped upon pulley 91. Gear 98 is
attached to said pulley 91, and meshes with gear
Said spring is interposed between and has its ends 20 99. The handle I00 and the pulley I03 are at
tached to said gear 99. Rotation of the said han
joined to the roller 5| and a gear 55 loose on said
dle I00 will therefore rotate the pulley 91 through
shaft. The gear 55 is connected to a similar
the gears 98 and 99. Rotation of the said pulley
gear 56 on the shaft of the roller 52 by means of
91 will move the said cross hair axially along
an idler 51. During assembly of the unit, the
chart 48 is placed in position on the rollers, and 25 the drum 15, with or against the tension exerted
by spring unit 92. Thus the positioning of the
with idler 51 disconnected from the gear 55 and
cross hair 90 over the chart 15' to any desired
with the rollers 5|, 52 held stationary, said gear
value of range spot AM, as indicated in the de
55 is turned to place the spring 54 under tension.
scription with reference to Fig. 8, may be pro
The idler 51 is then engaged with the gears 55,
56, and due to the torque exerted by the spring 30 duced by an appropriate manipulation of the han
dle I00.
54, a tension will be maintained on the chart 48.
The rotation of the pulley I03 and of the at
Since the gears 55, 56 must rotate by the same
tached tape IOI is therefore a measure of
amount, this tension will remain substantially
constant, regardless of the position to which the
Am = &
chart may be adjusted.
35
F20")
The handle 58 provides the input for present
range by means of which the average shell ve
and will be added to m, in a manner to be de
scribed, in order that the proper sight angle may
locity m for a given adyance range is established.
be indicated as corresponding to m+Am or to the
Said handle is geared to the shaft 59 which,
range+range spot. The said tape IOI is led from
through the gear 60 thereon, drives the gears SI 40 pulley I93 over idler pulley I02 and is attached
and 52 on the shaft 63, and further drives the
to pulley I04. The clock spring unit I05, pulley
gears 64 and 65 on the shaft 66. Said shaft 66
I04, and pinion I08 are mounted on a sleeve I01,
extends through the differential assembly indi
which is free to rotate on shaft 66. Tension is
cated by the differential spider gear 61. Said
maintained in the tape ml by the spring unit
gear 65 drives the roller 49 through the two idler
I05, which tends to rotate the said sleeve assem
gears 68, so that a turning movement of the
bly in the direction shown by the arrow. The
shaft 59 in either direction will be transmitted to
tension in the tape II]! will balance the tension
the roller 49, whereby the chart 48 will be trans
in the tape 9|, through the geared pulleys I03 and
ferred from the roller 5| to the roller 52, or vice
91, and thus any tendency for the handle I00 to
versa, and thus moved relative to the cross hair
rotate from the tape tension will be eliminated.
41’ on the transparent strip 41.
The internal gear I09 is attached to and rotates
Thus the inputs to the range chart are the
with shaft 56. The two pinions I08 rotate freely
present range introduced into the instrument by
on shafts attached to gear 61, and mesh with
operation of the handle 58, and the range rate R
both the said internal gear I09 and the pinion
which is set in by the operation of the own ship
I06. This gear structure constitutes one form
and target resolvers. When said resolvers are set
of the well known spur gear differential, having
in the machine by setting V0, B, Vt and T, the
two inputs represented by the rotation of sleeve
value R is computed by Equation 1 and fed into
I01 and the rotation of the internal gear I 09, and
the chart representing Equation 6. Turning the
an output equal to the rotation of gear 61, said
m handle 58 until the index covers the value of 60 output being equal to the sum of said inputs, or
R (known from the range ?nder on board ship)
as previously described, to m-I-Am. Said output
determines m and positions the m shaft. Thus
of gear 61 drives the sight angle chart II, illus
by (6) the average shell velocity m for the given
trated by Fig. 7 through the two idler gears H0,
advance range is established as a rotation of the
The structure, method of mounting, and the oper
shaft 59 which positions the drift cam 69, the
drum 14 on which is mounted the sight de?ection
spot chart 14', the range spot drum 15 and the
wind correction drum 16, as follows: The worm
gear 12 on shaft 59 engages with the worm wheel
'13 attached to the cam 69. The gear 11 on shaft
Y .ation 0f_the chart III are in general identical" __
with those described with reference to the pres
ent range chart 48. Thus values of sight angle
corresponding to m+Am, or to advance range plus
range spot, may be read from the said chart II I,
with reference to the stationary index I I2.
59 drives gear 18 and worm 19 on shaft 80, the
As previously described, rotation of the handle
said worm 19 in turn engaging gear 8| to drive
58 is employed to set in the average shell velocity
the sight deflection spot drum mounted on shaft
m on the shaft 59. Said shaft 59 drives shaft 53
82. Gear 83 on said shaft 82 engages with gear
through gears 60 and BI. Gear H3 is attached
84 on shaft 85 to rotate the attached drum 15 on 75 to shaft 63, and drives the idler'gear II4 which,
2,413,573
10
the own ship dial, so that the angle B is repre
in turn drives the rack II 5. The transparent
sented between the index I33 and a vertical line
strip II6 carrying the cross hair H1 is attached
through the dial center. The dial I34 is mounted
to rack H5, and is thereby adjusted in position
on the sleeve I35, concentric with dial I32, and
over the sight de?ection chart H8. The struc
ture and method of mounting of the said chart £1 is driven from knob I36 through gears I31, I38
and I39. Said dial I34 is graduated circumfer
H8 are identical with those described with ref
erence to the present range chart 48. However,
the drive roller I I9 is mounted on shaft I20, which
carries the pulley I2I and the torsion spring 122.
The non-elastic wire or tape I23 is attached to
and wrapped on the said pulley I2I. Said tor
sion spring I22 is arranged to apply a torsional
reaction to the said pulley I 2I, in the direction
of the adjacent arrow, and will therefore main
tain tension in the tape I23. The release or the
pulling of the tape I23 will therefore rotate the
pulley I2I to drive the chart II8 with or against
the torsion spring I22.
From Equations 2, 7, and 8 it appears that
entially in degrees, and also has a radial scale of
' wind correction muW, with zero wind correction
at the dial center. In operation of the said dial
I34, the relative direction w of the apparent wind
is set in on the dial I34 with respect to the previ
ously adjusted index I33. The angle 3-21) is
therefore represented between the radial scale of
muW and the vertical line through the dial center.
The wind correction drum ‘I6, which is rotated
by the quantity m, has a chart ‘I6’ represented
by Fig. 5 wrapped on it, with the m axis extend
ing in a circumferential direction around the
drum. A linear scale I40 of wind velocity W in
knots is placed adjacent to the drum 16. After
the drum ‘I5 has been properly positioned in
accordance with the quantity m, the wind correc
tion muW can be read from the chart at any
As has been previously described, the values of
(D'+AD') can be read from the chart of Fig. 4,
corresponding to chart H8, at given values of
(ZB-I-AT) and m, where (:r+A:l:) can be considered
as the numerator of the above equation. It is
therefore necessary to position the chart H8, or
to operate the tape I23 in accordance with the
numerator of said equation, and to position the
cross hair II‘I as described in order that the
values of corrected sight de?ection D’ or D'+AD'
may be read on the chart II8.
It will now be :
shown how each of the various quantities in said
numerator can be derived from the mechanism
and additively introduced as the motion of the
tape I23.
The drift cam follower ‘II is pivoted at ‘I0 and
is operated by the cam 69 through an angle which
corresponds to m6. One end of the tape I23 is
attached to the free end of the follower ‘II, and
therefore moves a corresponding distance m5.
As previously mentioned, the equation for spot
given valued wind velocity W.
The handle I44 is geared to the lead screw I45,
which moves the traveling nut I45. The trans
parent strip I43, carrying the cross hair I42, is
disposed above the dial I34, and is attached to
the said traveling nut I46. Movement of the
handle I44 therefore permits the cross hair I42
to be positioned at the value of muW on the radial
scale I4l, as read from the wind correction
chart ‘I6’.
As indicated, the traveling nut I46 and its at
tached pulley I4‘I, are then displaced by the
amount of muW sin (B-w). The tape I23 is
guided over the fixed idler pulley I48 and is then
looped over the movable pulley I4‘I, causing any
displacement of said pulley I41 to produce a
proportional movement of tape I23. Said tape
I23 is then looped around the movable pulley
I50 attached to the traveling nut 24 to impart
the own ship’s component of motion V0 sin B
across the line of sight, to the movement of tape
I23, the movement of the said traveling nut 24
being previously described with reference to dial
II. Said tape I23 is next guided in turn over
the ?xed idler pulleys I49 and I5I, the mov
able pulley I52 attached to the traveling nut,
The sight de?ection spot drum ‘I4 has wrapped
upon it a chart similar in construction to that 50 32, the idler pulley I53, and is attached to the
drive pulley I2I. As described with reference to
illustrated by Fig. 4, with the 'm. axis extending
dial I 2, the movement of the traveling nut 32 is
in a circumferential direction around the drum.
the target's component of motion Vt sin 7' across
The transparent strip I25, carrying the cross hair
the line of sight, which is thereby added to the
I24, is located above the said drum ‘I4. The
handle I28 is geared to lead screw I21, which 55 motion of tape I23. Thus all the various quan
tities
moves the traveling nut I26 on which said strip
I25 is mounted, thus permitting the movement
V0 sin B+Vt sin 1+muW sin (B-w) —m6+mAD’
of the cross hair I24 along the drum ‘I4. After
are imparted additively to the motion of the tape
the said drum ‘I4 has been positioned in accord
‘ance with the quantity m, the handle I28 is 60 I23, and the sight deflection corresponding to
correction in sight de?ection is Ax=mAD', the
corresponding chart consisting of a series of
straight lines with a common point of origin.
operated to move the cross hair I24 over the chart
this motion and to the quantity m, can be read
to the line designating the appropriate spot cor
from the sight de?ection chart I I8.
The operation of the instrument may be
rection AD’.
The movement of the cross hair
I24 is then the required Am. The pulley I29, at
brie?y summarized as follows:
tached to the underside of the traveling nut I28, 65 w lSet thepwnnship?dial lLtoAthe relativewtarl __A__
is moved an equal amount.‘ The tape I23 passes
get bearing B, which moves the index I33 on
over the stationary guide pulley I30, the said mov
able pulley I29 and then over the stationary guide
pulley I3I. The movement A0: of the said pulley
dial I32 to an equal angle.
2. Set the vertical and horizontal own ship’s
The gear I5 which positions the own ship dial
II is also geared to drive the dial I32. The index
I33 is placed at the edge of dial I32, and is ar
- ranged to move in synchronism with the bow of
sight V0 sin B.
3. Set the target dial I2 to the target angle 1.
4. Set the vertical and horizontal target cross
hairs 38 and 39 to intersect at target speed,
cross hairs 22 and 23 to intersect at own ship
I29 will therefore cause a proportional change in 70 speed, giving the component in the line of sight
the length of the tape I23 looped around it.
V0 cos B and the component across the line of
2,413,573
11
12
giving the component in the line of sight
drum movable along one coordinate and an in
Vt cos 1- and the component across the line of
sight Vt sin -r.
5. Set present range on the range chart. This
dicator associated with said drum and movable
along another coordinate, a drive for said drum,
gearing for operating said indicator, an input
shaft coupled to said gearing for operating the
positions the shaft 59, which drives the sight de
?ection cross hairs I I1, the sight angle chart I I2,
the drift cam 69, the wind correction drum "I6,
the sight de?ection spot drum ‘I4, and the range
same to move said indicator, a drift cam also
driven by said shaft and having a follower, and
a ?exible element having one end connected to
spot drum 15. g
the drive for said drum and its other end con
6. Set the dial I34 to the apparent direction 10 10 nected to said follower, with intermediate por
of the relative wind W with reference to the
tions thereof operatively connected to the ?rst
index I33 on the dial I32.
named follower members.
7. Read the‘ value of muW on the wind correc
3. In a ?re control system, means to compute
tion chart 16', corresponding to the observed
sight de?ection comprising mechanisms to ob
value of wind velocity W, and set the cross hair 15 tain the cross components of own ship and tar
I42 on the radial wind dial scale MI.
get speeds, adjusting means for said mechanisms
8. Set the cross hairs 90 to the desired spot
including follower members, a chart-carrying
AR in range on the range spot chart ‘I5’.
drum movable along one coordinate and an in
9. Set the cross hairs I24 to the desired spot
dicator associated with said drum and movable
AD in sight de?ection on the sight de?ection 20 along another coordinate, a drive for said drum,
spot chart ‘M’.
gearing for operating said indicator, an input
10. Read sight angle on chart III and sight
shaft coupled to said gearing for operating the
de?ection on chart H8.
same to move said indicator, a drift cam also
As the mechanism of the instrument is required
driven by said shaft and having a follower, wind
to drive only charts and dials, its construction 25 correction means including a follower member,
may be very light, and does not require the use
and a ?exible element having one end connect
of ball bearings except in the pulley system
ed to the drive for said drum and its other end
which controls the sight de?ection tape I23. It
connected to said drift cam follower, with in
will be noted that none of the usual calculating
termediate portions thereof operatively connect
elements are used, the calculations being per 30 ed to the ?rst and last named follower members.
formed by the use of charts.
Great accuracy
and facility in reading the charts may be secured
by lengthening the charts to any suitable de
gree. This involves only appropriate changes in
the gear ratios and does not increase the weight
or cost of the instrument.
While one form of the invention has been
described, it will be appreciated that various
modi?cations can be made in the embodiment,
arrangement, and application of the various
principles described to the problem of gun ?re
control.
The same mathematical formulae may
be solved by equivalent calculating elements, as
for example, by substituting mechanical calcu
lating devices for charts and curves, in the event
it is desired to employ automatic inputs or out
puts. The systems of tape and pulleys employed
for the addition and the conveyance of quanti
ties involved in the calculations is especially sub
ject to wide modi?cations. The scope of the 50
invention is therefore not to be limited except as
» 4. In a ?re control system, means to compute
sight de?ection comprising mechanisms to ob
tain the cross components of own ship and tar
get speeds, adjusting means for said mechanisms
including follower members, a chart-carrying
drum movable along one coordinate and an in
dicator associated with said drum and movable
along another coordinate, a drive for said drum,
gearing for operating said indicator, an input
shaft coupled to said gearing for operating the
same to move said indicator, a drift cam also
driven by said shaft and having a follower, a
second drum for carrying a sight de?ection spot
chart and operatively connected to said input
shaft, an indicator associated with said second
drum and including a follower member, and a
?exible element having one end connected to the
drive for the ?rst named drum and its other
and connected to said drift cam follower, with
intermediate portions thereof operatively con
indicated by the following claims.
What is claimed is:
gected to the ?rst and last named follower mem
thereby combine said components to determine
shaft coupled to said gearing for operating the
ers.
5. In a ?re control system, means to compute
1. In a ?re control system, mechanisms to ob
sight de?ection comprising mechanisms to ob
tain the components of own ship and target
tain the cross components of own ship and tar
speeds in the line of sight including follower ‘
get speeds, adjusting means for said mechanisms
members, a transmitting mechanism including a
including follower members, a chart-carrying
?xed and a movable pulley, a ?exible element ex
drum movable along one coordinate and an in
tending around said pulleys and having its ends
dicator associated with said drum and movable
connected to said follower members so as to be 60 along another coordinate, a drive for said drum,
operable thereby to move said movable pulley to
gearing for operating said indicator, an input
range rate, an indicator connected with said
movable pulley and movable therewith along one
coordinate, a chart-carrying drum operatively
associated with said indicator and movable along
another coordinate, and input means for mov
ing said drum relative to said indicator to estab
same to move said indicator, a drift cam also
driven by said shaft and having a follower, wind
correction means includingv a‘ followergmemberre ~
a second drum carrying a sight de?ection spot
chart and operatively connected to said input
shaft, an indicator associated with said second
lish average shell velocity for a given advance
drum and including a follower member, and a
range.
70 ?exible element having one end connected to the
2. In a ?re control system, means to compute
drive for the ?rst named drum and its other end
sight de?ection comprising mechanisms to ob
connected to said drift cam follower, with inter
tain the cross components of own ship and tar
mediate portions thereof operatively connected
get speeds, adjusting means for said mechanisms
to all of said follower members. ,
including follower members, a chart-carrying 75
6. In a ?re control system, means to compute
6105
13'
2,413,573
sight de?ection comprising mechanisms to ob
tain the cross components of own ship and tar
get speeds, adjusting means for said mechanisms
including follower members, a chart-carrying
drum movable along one coordinate and an in
dicator associated with said drum and movable
along another coordinate, a drive for said drum,
gearing for operating said indicator, an input
14
drum including a follower member, means oper
atively connecting said input shaft to said sec—
ond drum, a third drum carrying a spot range
chart and operatively connected to said sec
ond drum, a fourth drum carrying a sight
angle chart and operatively connected to said
second and third drums through said input shaft,
and a ?exible element having one end connect
shaft coupled to said gearing for operating the
ed to the drive for the ?rst named drum and
driven by said shaft and having a follower, a
second drum for carrying a sight de?ection spot
chart, an indicator associated with said second
lower, with intermediate portions thereof oper
atively connected to all said follower members.
same to move said indicator, a drift cam also 10 its other end connected to 'said drift cam fQl
EARL E. LIBMAN.
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 141 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа