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Патент USA US2406999

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33~238.
(HR>
2 a 406 9 999
Sept. 3, 1946.
F. w. DURGIN
_- 2,406,999
CONTINUOUS RANGE FINDER
Filed April 23, 1943
-
IINVENTOR'
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Patented Sept. 3, 1946
2,406,999
UNITED STATES PATENT OFFICE
3
2,406,999
CONTINUOUS RANGE FINDER
Franklin W. Durgin, Washington, D. 0.
Application April 23, 1943, Serial No. 484,279
4 Claims. (Cl. 33-—49)
2
1
This invention relates to improvements in
tinuous range ?nders and more speci?cally
gun-coupled range ?nder particularly
adapted for anti-aircraft use.
The primary object of the invention is to
The rotatable light de?ector I2 is directly con
nected to the shaft of a suitable rheostat 2|.
con
to a
well
pro
Attached to the gun A is a solenoid 22, in series
iii
vide a gun-coupled range ?nder which will au
circuit with the rheostats I8, 20 and 2|, the ar
mature 23 of the solenoid being fastened to the
longitudinal sight member I4. A suitable source
of current 24 is provided in the circuit, as shown
in Figure 3.
The rheostats I8, 20, and 2| have resistances
tomatically maintain the range ?nder at the
proper angle to the gun when the gun is proper
ly rotated and the range ?nder is properly fo
cused on a moving target, such as an airplane.
10 which are so related to the factors of aircraft
Other objects and advantages of the invention
speed, angular elevation, and aircraft distance,
that the current in the circuit is varied in re
will become apparent during the course of
sponse to changes in the speed, angular eleva
the following detailed description, taken in con
tion, and distance of an approaching aircraft
nection with the accompanying drawing, form
ing a part of this speci?cation, and in which
whereby the solenoid will dispose the sight mem
drawing,
ber M in proper angular relation to the gun A,
Figure 1 is a diagrammatic side view of the
gun-coupled range ?nder focused on an air
which is angularly rotated, as by the gunner, at
a rate just su?icient to retain the images of the
approaching aircraft in the range ?nder B.
plane in ?ight.
Figure 2 is a diagrammatic plan view of the 20 As the speed indicating shaft of the speedome
ter l6 turns responsive to apparent or actual
gun-coupled range ?nder.
increase in speed of the aircraft, the shaft of the
Figure 3 is a diagrammatic view of an electri
rheostat I8 is automatically turned so as to in
cal circuit preferably forming a part of the in
crease the current ?ow through the solenoid 22,
vention.
~
In the drawing, which for the purpose of il 25 whereby the angularity between the gun and
sight member I4 is increased.
lustration shows only a preferred form of the in
As the sight member l4 turns toward the ver
vention, and wherein similar reference charac
tical, the shaft of the rheostat 20 is gradually
ters denote corresponding parts throughout the
turned to reduce the current flow so as to com
several views, the letter A generally designates
the gun, to which is coupled the range ?nder B, 30 pensate for any advancement of the rheostat ,
I8 that is due to apparent but not actual increase
focused on a moving target, such as the air
in speed of the approaching aircraft, it being un—
plane C. ‘
derstood that the sight member I4 is accelerated
Any suitable range ?nder B, such as shown in
as it approaches the vertical when the speed of
U. S. Patent #279,273 to Patterson or #1,968,002
to Nowicki et al., may be employed. There is dis 35 the aircraft is constant.
As the light de?ector I2 is turned or otherwise
posed, in alignment with the axis IU of elevation
controlled by the gunner to retain the dual im
of the gun A, the lateral sight member ll of the
ages of the approaching aircraft in proper align
range ?nder B having a conventional rotatable
ment in the range ?nder B, the shaft of the rheo
light de?ector l2, constituting the movable com
ponent of the range ?nder. A semi-transparent 40 stat 2| is automatically turned to increase the
current flow through the solenoid, whereby the
mirror l3 disposed at an angle of 45° within the
angularity between the gun A and the sight mem
longitudinal sight member M at the intersection
ber
I4 is increased.
of the lateral sight member |l constitutes the
?xed component of the range ?nder.
-
Any suitable motion transmitting means, such
as a belt I5, is provided between the axis of ro
Thus, the relationship of the sight member M
45 to the gun A depends on the speed, angle of ele
vation, and distance of the‘approaching aircraft
C relative to the location of the gun A.
tation of the range ?nder and the drive shaft of
Various changes may be made in the form of
a speedometer I8 whose speed indicating shaft
invention herein shown and described without de
is connected, as by a belt H, to the shaft of a 50 parting from the spirit of the invention or the
suitable rheostat [8.
scope of the following claims.
Any suitable motion transmitting means, such
I claim:
as a belt I9, is provided between the axis of ro
1. The combination with a gun rotatable about
tation of the range finder B and the shaft of a
a given axis, of a range ?nder mounted for ro
suitable rheostat 20.
55 tation about the axis of rotation of the gun, said
2,406,999
4
3
range ?nder provided with a movable distance
indicating element, a single power actuated
means for controlling the angular relationship
a given axis, of a range ?nder rotatable about the
axis of rotation of the gun, said range ?nder be
ing adjustable for target distance, a single power
actuated means controlling the angular relation
of the gun and range ?nder substantially in ac
cordance with the amount of power actuating said 5 ship of the range ?nder to the gun substantially
in accordance with the instantaneous value of the
control means, a source of energy for actuat
ing said control means, a speedometer driven by
rotation of the range ?nder, and plural jointly
power actuating said control means, a source of
energy actuating said control means, and plural
jointly acting means varying the amount of en
acting means for varying the amount of energy
delivered to said control means including means 10 ergy delivered to said control means including
means responsive to changes in the target-dis
controlled by said speedometer, means controlled
tance adjustment of the range ?nder.
by said movable element, and means responsive to
4. The combination with a gun rotatable about
changes in the angular position of the range
a given axis, of a range ?nder rotatable about an
?nder.
2. The combination with a gun rotatable about 15 axis extending in the direction of the said axis
a given axis, of a range ?nder mounted for ro- - _of rotation of the gun, said range ?nder pro~
tation about the axis of rotation of the gun, said
mventyqa ‘solenoid, a source of current energizing
range ?nder provided with a movable element
the solenoid, said solenoid controlling the angular
for adjustment to a position indicative of the
distance to the target,’ an electro-motive device '20 relationship of the range ?nder to the gun sub
stantially in accordance with the amount of en
for controlling the angular relationship ‘of the
ergy supplied to the solenoid, a speedometer,
gun and range ?nder substantially in accordance
means driving the speedometer at a rate depend~
With the amount of energy actuating said device,
‘ing on the rate of rotation of the range ?nder,
a source of current for actuating said electro
motive device, a’speedgmeter driven by rotation 25 and a plurality of serially connected ‘impedance;
for regulating the ?ow of current from said source
of the range ?nder, Miami-n51 "jointly acting
to said solenoid and including a, rheostat con
means for regulating thefliow of ‘current from
trolled by said speedometer, a rheolstat controlled
said source to said electro-motive device com
p'dedntMigq?llkl?lg????lgglldingeele
.prising means controlled by said speedometer,
by movement of said distance-?nding element,
means controlled by said movable element, and 30 ‘and a rheostat responsive to changes in the angu
lar position of the'range ?nder.
means responsive to changes in the angular po
)
sition of said range ?nder.
.
3. The combination with a gun rotatable about
FRANKLIN W. DURGIN.
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