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Патент USA US2299313

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Oct. 20, 1942.
F, w, DuRGm
2,299,313
BOMB SIGHT
Filed Oct. 28, 1941
SIGHT MEMBER
SPEEDOMETER
LIGHT SOURCE
PHoTo-ELEcTmc CELL
ALTIMETER
32
RELEASE MECHAN\SM
3mm M 0%
Patented Oct. 20, 1942
2,299,313
UNITED STATES PATENT OFFICE
2,299,313
BOMB SIGHT
Franklin W. Durgin, Washington, D. 0.
Application October 28, 1941, Serial No. "416,915
7 Claims. (01. 33-465)
The invention relates to improvements in air
the angular position of the indicator shaft 2|
craft bomb release mechanism and target sights
of the speedometer will depend on the rate of
therefor.
rotation of the sight member I ll. An increase
In horizontal ?ight bombing operations, the
in the rate of rotation of the sight member will
use of a target sighting and bomb releasing
turn the indicator shaft 2| in the direction of
mechanism that requires manual compensation
the arrow. Mounted on the indicator shaft 2|,
for variations in the altitude of the bombing air
which is parallel to the pivot II, is a mirror 22,
craft tends to produce unsatisfactory results, in
constituting a de?ector for the light ray l6.
that the aircraft pilot may ?nd it necessary for
Disposed near the speedometer is an altimeter
protective reasons to make a change in the al 10 25 having an indicator shaft 26, parallel to the
titude of the aircraft immediately prior to th
speedometer shaft 2|, and turning in the direc
instant for releasing the bomb.
tion of the arrow as the altitude increases.
Mounted on the altimeter shaft 26 is a mirror
21 constituting a de?ector for the light ray I 6.
While I have shown and described the speed
ometer and altimeter as provided with mirrors
'
An important object of the present invention
is to provide an aircraft bomb release mecha
nism and target sight that will automatically
compensate for variations in altitude of the
bombing aircraft.
-
A further object of the invention is the pro
vision of an aircraft bomb release mechanism
and target sight that will automatically com
perisate for variations in speed of the bombing
aircraft.
The invention also aims to provide mechanism
of the character described including a speed
ometer and an altimeter coupled with the mech
anism in a manner whereby normal operation
of the speedometer and altimeter is not a?ected
by mechanical connections that would tend to
disturb their accuracy.
Other objects and advantages of the inven 30
tion will become apparent during the course of_
the following detailed description, taken in con
nection with the accompanying drawing, form
ing a part of this ‘speci?cation, and in which
drawing the single ?gure is a diagrammatic view 35
in side elevation of my improved target sight
ing and bomb releasing mechanism.
22, 21 for de?ecting the light ray I6, it will be
understood that the de?ection may be accom
plished by any suitable optical means.
The means I5 producing and directing the
light ray l6 and the light ray deflecting mirrors
22, 21 are so correlated that, upon the existence
of a predetermined balance between the angular
position of the sight member ID and the angu
lar positions of the speedometer and altimeter
shafts 2|, 26, the light ray I 6 will be de?ected
into a photo-electric cell 30. Operatively con
nected to the cell 30, as by conductors 3| and
relay means 32 is any suitable electric bomb re
lease mechanism 33.
-
In the operation of the target sighting and
bomb releasing mechanism, after the target be
ing approached is observed through the sight Ill,
the bombardier rotates the sight member manu
ally_ or controls the rotation of the sight member
by any suitable automatic driving means, so as
to retain the image of the target in the sight.
Rotation of the sight member III will change the
direction of the light ray [5 and will also drive
In the drawing, which for the purpose of illus
tration shows only a preferred embodiment of
the invention, l0 designates a target sighting 40 the speedometer 20, thereby controlling the posi
tion of the mirror 22, the position of the mirror
member rotatable about a pivot ll so as to per?
mit continuous sighting of the target l2 along
21 being controlled by the altimeter. With the
speedometer and altimeter mirrors 22, 21 posi
a line I3. While I have shown a tubular type
of sight member that is bodily rotatable, it will
tioned as shown in the drawing, further rotation
of course be understood that, other types of sight 45 of the sight member in the direction of the ar
members including rotatable elements may be
.row, as the ‘projected distance of the bombing
employed.
,
aircraft relative to the target is reduced, will de
Fixedly secured to the sight member l0, pref-l
erably adjacent the pivot vll, is means l5 for
producing a light ray l6 projecting in a direce
?ect the light ray IS in the direction of the photo
electric cell“3ll. Likewise, any increase in the
speed or altitude of the bombing aircraft will
tion depending on the angular position of the" bring about a change in the angularity 0f the
rotatable sightmember l0..
/ .
mirrors 22, 21 whereby to de?ect the light ray IS
Disposed near the sight member In is a speed
in the direction of the photo-electric cell 30. It
ometer 20', driven upon rotation of the .sight‘
will therefore be understood that the variable
member in the direction of the arrow, so that-55 components of projected distance, speed and alti
2,299,313
4. In‘ aircraft bomb sight mechanism, a sight
tude of the bombingaircraft relative to ‘the tar_-‘
get l2 which enter into a determination of the
member rotatable to permit continuous training
proper moment for the release of a bomb will
tend to a?ect the angular positions of the sight ‘
ing a light ray, ‘means de?ecting said light ray _
member lb and the ‘speedometer and altimeter
mirrors 22, z'L'whereby to de?ect the light rail
into impinging relation to the photo-electric cell.
on a target being approached, means for produc
depending on the angular position of said rotata
ble sight member, rotary means de?ecting said
light ray depending on the speed of rotation of
said sight member, rotary means de?ecting said
Various changes may be made in the form of
invention herein shown and described, without. - light ray depending on the altitude of said sight
member, and photo-electric means, all of said
departing from the spirit of the invention or the
light ray de?ecting means being so correlated
scope of the following claims.
that the light ray is de?ected into said photo
I claim:
102
electric means when a balance exists between
' 1. In aircraft bomb sight mechanism, a sight
member rotatable to permit continuous training ._ t the angular position of the rotatable sight mem
on a target being approached, means for produc-" 155 ber and the angular positions of said speed and
altitude responsive rotary de?ecting means.
ing a light ray and directing said light ray de-':
5. In aircraft bomb sight mechanism, a sight
pending on the angular position of the sight
member including an element rotatable to permit
member, a speedometer driven by rotation of the
sight member, an altimeter, means operated by; - continuous training on a target being approached,
the speedometer to variably de?ect the light ray, 20 means for producing a light ray, means de?ect
ing the light ray depending on the position of
means operated‘ by the altimeter to variably de
said rotatable element, rotary means de?ecting
?ect the light ray, and photo-electric means ar
the light ray depending on the rate of rotation
of said element, rotary means de?ecting the light
the sight member and said light ray de?ecting 25 ray depending on the altitude of said sight mem
ber, and photo-electric means, all of said light
means.
_
ray de?ecting means being so ‘correlated that the
2. In aircraft bomb sight mechanism, a rotary
light ray is de?ected into said photo-electric
sight member, means producing a light ray and
means when a balance exists between the angular
projecting said light ray in a direction depending
on the angular position of the rotary sight mem 30 position of the sight member and the angular
positions of said rotary de?ecting means.
ber, a speedometer driven by rotation of the
6. In aircraft bomb sight mechanism,_a sight
sight member and including a rotary shaft, means
ranged to intercept the de?ected light ray when a
balance exists between the angular position of
carried by the speedometer shaft for de?ecting
member rotatable to permit continuous training
on a target being approached, means for pro
said light ray, an altimeter including a ,rotary
shaft, means‘ carried by the altimeter shaft for 35 ducing a light ray and directing said light ray
de?ecting said light ray, and photo-electric
means, said light ray projecting. and de?ecting
depending on the angular position of the sight
member, instruments a?‘ected by varying ?ight
conditions of the aircraft, and means carried by
said instruments for de?ecting the light ray de
exists between the 'angulanposition of the sight 40 pending on said varying ?ight conditions, where
by the light ray is de?ected into a de?nite zone
member and the angular positions of said speed
when a balance exists between the positions of
ometer andaltimeter shafts.
>
the sight member and said instruments.
3. In aircraft bomb sight mechanism, a sight
7. In aircraft bomb sight mechanism, a sight
member rotatable to permit continuous training
on a target v,beiipg' approached, means carried 45 member rotatable to permit continuous training
on a target being approached, means for pro
by the sight member for projecting a light ray in
ducing a light ray and directing said light ray de
a direction depending on the‘ angular position of
pending on the angular position of the sight mem
the rotatable sight‘member, rotary means de
ber, a speedometer driven by rotation of the sight
?ecting said light ray‘ depending on the speed
member, an altimeter. means operated by the
of rotation of the sight member, rotary means
de?ecting said light ray depending on_ the alti- , speedometer to variably de?ect the light ray, and
means operated by the altimeter to variably de
tude' of said sight member, and photo-electric
?ect the light ray, whereby said light ray is guided
means, said light ray projecting and de?ecting
toward a de?nite zone when a balance exists be
‘means being so correlated that the light ray is
de?ected into said photo-electric means when a 55 tween the positions of the sight member, speedg
ometer. and altimeter.
balance exists between the angular position of
the rotatable sight member and the angular posi
FRANKLIN W. DURGIN.
tions of said speed and altitude responsive rotary
means so correlated that the light ray is de?ected
into said photo-electricmeans when a balance
de?ecting means.
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