U.S. patent number 3,737,232 [Application Number 05/080,840] was granted by the patent office on 1973-06-05 for firearm telescopic range finder.
Invention is credited to Raymond E. Milburn, Jr..
United States Patent |
3,737,232 |
Milburn, Jr. |
June 5, 1973 |
FIREARM TELESCOPIC RANGE FINDER
Abstract
A range finder device with a range telescope mounted parallel to
and laterally spaced from a conventional gun sight telescope
adapted to be mounted on a rifle. The range telescope has an
optical and mechanical mechanism for sweeping its line of sight in
a generally horizontal plane so that it crosses the line of sight
of the gun telescope. A manually rotatable wheel with graduations
thereon drives the mechanism for sweeping the line of sight of the
range telescope. The graduations are spaced on the wheel in
proportion to the included angle formed by the crossing of the
lines of sight to provide an indication of the distance between a
target at the point of crossing and the rifle on which the range
finder device is mounted.
Inventors: |
Milburn, Jr.; Raymond E. (Round
Lake, IL) |
Family
ID: |
22159958 |
Appl.
No.: |
05/080,840 |
Filed: |
October 15, 1970 |
Current U.S.
Class: |
356/18; 356/16;
33/276; 359/407; 42/122 |
Current CPC
Class: |
G02B
23/14 (20130101); F41G 1/473 (20130101); F41G
1/38 (20130101) |
Current International
Class: |
F41G
1/38 (20060101); F41G 1/473 (20060101); G02B
23/14 (20060101); F41G 1/00 (20060101); G01c
003/14 () |
Field of
Search: |
;356/7,16-19 ;350/36,10
;33/5A,63,245,276 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Wibert; Ronald L.
Assistant Examiner: Evans; F. L.
Claims
What is claimed as new is as follows:
1. A range finder device for a rifle comprising a gun sight
telescope having a barrel and a reticle, a range telescope having a
barrel, a reticle and means within said barrel thereof for
optically shifting the apparent line of sight of said range
telescope in a generally horizontal plane in the field of view
thereof by movement of said means for optically shifting relative
to said barrel thereof, a rigid support carrying said range
telescope with said barrel thereof in fixed relation to said barrel
of said gun sight telescope with the longitudinal center lines of
said barrels generally parallel to and laterally spaced from each
other, manually operable driving means operably connected to and
controlling movement of said means for optically shifting of said
range telescope relative to said barrel thereof so that an observer
with one eye peering through one of said telescopes and the other
eye simultaneously peering through the other of said telescopes can
simultaneously aim both of said telescopes on a single target point
by manipulation of said driving means, and indicator means
responsive to movement of said means of optically shifting of said
range telescope to indicate the distance from said telescopes to
said target point when both of said telescopes appear to the
observer to be simultaneously aimed on said target point.
2. The range finder device of claim 1 in which said driving means
comprises a shaft carried by said support for rotation about its
longitudinal axis and extending generally transversely between said
telescopes, said shaft being operably connected to said means for
optically shifting, and a wheel fixed to said shaft, said wheel
being positioned adjacent said telescopic gun sight to facilitate
rotation of said shaft by manual manipulation of said wheel.
3. The range finder device of claim 2 in which said indicator means
comprises a plurality of graduations carried by and spaced about
the periphery of said wheel in proportion to the apparent
displacement of the line of sight of said range telescope by
rotation of said wheel.
4. The range finder device of claim 1 wherein each of said
telescopes has an eyepiece and which also comprises a periscope
carried by said support, said periscope receiving light from the
eyepiece of said range telescope and having a viewing window
laterally spaced from and generally aligned with the eyepiece of
said gun sight telescope, whereby the image formed by said range
telescope can be observed through said viewing window by one eye of
an observer while the other eye can simultaneously observe the
image formed by said gun sight telescope.
5. The range finder device of claim 4 in which the body of said
periscope has telescopic sections such that the lateral spacing
between said viewing window and said eyepiece of said gun sight
telescope can be varied to accommodate different eye spacings of
various observers.
6. The range finder device of claim 1 in which said range telescope
comprises a standard commercially available gun sight telescope
with a windage adjustment.
7. The range finder device of claim 1 in which said range telescope
has an objective lens adjacent one end and an eyepiece adjacent the
other end of said barrel thereof and said means for optically
shifting the apparent line of sight of said range telescope
comprises a sleeve mounted in said barrel of said range telescope
between said objective lens and said eyepiece for generally pivotal
movement on its longitudinal axis, at least two longitudinally
spaced lenses coaxially mounted in said sleeve, and means connected
to said driving means for pivotally moving said sleeve in a
generally horizontal plane in response to manipulation of said
driving means to shift the apparent line of sight in a generally
horizontal plane in the field of view of said range telescope.
8. The range finder device of claim 7 in which said driving means
comprises a shaft carried by said support for rotation on its
longitudinal axis and extending generally transversely between said
telescopes, said shaft being operably connected to said means for
optically shifting, and a wheel fixed to said shaft, said wheel
being positioned adjacent said telescopic gun sight to facilitate
rotation of said shaft by manual manipulation of said wheel.
9. The range finder device of claim 7 which also comprises a
periscope carried by said support, said periscope receiving light
from the eyepiece of said range telescope and having a viewing
window laterally spaced from and generally aligned with the
eyepiece of said gun sight telescope, whereby the image formed by
said range telescope can be observed through said viewing window by
one eye of an observer while the other eye can simultaneously
observe the image formed by said gun sight telescope.
10. The range finder device of claim 8 which also comprises a
periscope carried by said support, said periscope receiving light
from the eyepiece of said range telescope and having a viewing
window laterally spaced from and generally aligned with the
eyepiece of said gun sight telescope, whereby the image formed by
said range telescope can be observed through said viewing window by
one eye of an observer while the other eye can simultaneously
observe the image formed by said gun sight telescope.
Description
This invention relates to range finders and more particularly to a
range finding device for use in conjunction with a telescopic sight
for a gun.
Objects of this invention are to provide a range finder
particularly suitable for use by sportsmen in conjunction with a
gun sight telescope of a rifle which is of comparatively simple
design, economical manufacture and assembly, and relatively service
and maintenance free.
These and other objects, features and advantages of this invention
will be apparent from the following description and accompanying
drawings in which:
FIG. 1 is an isometric view of a range finder device constructed in
accordance with this invention and mounted on a gun sight telescope
of a rifle.
FIG. 2 is an end view through the eyepieces of the range finder
with the device zeroed in on a target.
FIG. 3 is a fragmentary plan view of the periscope of the range
finder.
FIG. 4 is a fragmentary plan view partially in section of the range
finder and gun sight.
FIG. 5 is a schematic diagram of the manner in which the range
finder functions.
Referring to the drawings:
FIG. 1 illustrates a range finder device 10 constructed in
accordance with this invention mounted by supports or brackets 12
and 14 on a conventional gun sight telescope 16 with a reticle a
barrel 18 and eyepiece 20 mounted on a rifle 22. Device 10 has a
range finder telescope 24 with a barrel 26, objective lens 28,
eyepiece 30 and adjusting screws 33 and 35 for optically shifting
the line of sight of cross hairs 32 and 34 of the reticle thereof.
Barrel 26 of range telescope 24 is received in yokes 36 at one end
of brackets 12 and 14 and retained in the yokes by clamp members 38
secured to the brackets by screws 40 (FIG. 4). The other end of
brackets 12 and 14 have yokes 42 which engage barrel 18 of
telescopic sight 16 and are fixed thereto by clamping members 44
secured to the brackets by cap screws 40. Range telescope 24 is
mounted by brackets 12 and 14 with the longitudinal axis of barrel
26 laterally spaced from and parallel to the axis of gun sight
telescope 16. Cross hairs 32 and 34 of range telescope 24 are fixed
to one end of a tube 46 slidably received in firm frictional
engagement with the inner wall of barrel 26 and having a lens 48
mounted therein adjacent its other end.
As shown in FIGS. 1 and 3, a person using the range finder can
simultaneously look through both gun and range telescopes 16 and 24
due to a periscope 50 with a viewing window or eyehole 52. The
lateral spacing between eyehole 52 of periscope 50 and eyepiece 20
of gun telescope 16 can be adjusted to accommodate a wide range of
eyespacings for various viewers. A hollow tubular L-shaped body 54
with a window 56 of a transparent material such as glass is
slidably received in an L-shaped tubular body 58 and is locked in
various positions of sliding adjustment by a threaded locking screw
60 received in a slot 62 in body 54. Body 54 is retained in body 58
by a screw 64 extending through bracket 12 and riding in an
elongated pocket 66 in body 54. Tubular body 58 has a reduced shank
67 adjacent one end which is generally coaxial with eyepiece 30 of
range telescope 24 and is received in yoke 36 and clamping member
38 of bracket 12 to fixedly mount periscope 50 on the end of
telescope 24. Flat silvered mirrors 68 and 70 are mounted in bodies
54 and 58 respectively generally parallel to each other and at
45.degree. to the longitudinal axis of periscope 50 so that the
image formed by eyepiece 30 of range telescope 24 can be viewed
through eyehole 52.
As shown in FIG. 4, the line of sight or elevation and windage of
horizontal hairline 32 and vertical hairline 34 respectively of
range telescope 24 is optically adjusted by arcuate movement of a
pair of lenses 72 and 74 in barrel 26. Lenses 72 and 74 are fixedly
mounted in a sleeve 76 with a flange 78 adjacent one end slidably
received in barrel 26 for generally pivotal movement about flange
78. Adjusting screws 33 and 35 optically shift the elevation and
windage of the horizontal and vertical cross hairs by pivotally
moving sleeve 76 in vertical and horizontal planes respectively.
Adjusting screws 33 and 35 are threadingly received in a bracket 80
secured to barrel 26 by screws 82 threadingly engaging a ring 84
slidably received in barrel 26. Adjusting screws 33 and 35 are
positioned so that they bear on sleeve 76 adjacent its free end at
a right angle to each other and sleeve 76 is urged into firm
engagement with the adjusting screws by a leaf spring 86 with its
opposed ends engaging in slots in sleeve 76 and ring 84 to retain
sleeve 76 is spaced relation to ring 84. A range telescope 24
including adjusting screws 33 and 35 for optically shifting the
line of sight or elevation and windage of cross hairs 32 and 34 is
commercially from the Savage Arms Division of Emhart Corp.,
Westfield, Mass., U.S.A., Zip Code 01085, and can be ordered as
Savage -- SUWA Model 0420A.
As shown in FIGS. 1 and 4, a knurled wheel 88 connected to windage
adjusting screw 35 can be manually rotated to sweep the line of
sight of range telescope 24 in a generally horizontal plane to
provide in cooperation with gun sight telescope 16 an indication of
the range of distance from a target to the rifle or gun 22 on which
range finder device 10 is mounted. Wheel 88 has a plurality of
graduation 90 and yardage indicia 92 and is fixed to a drive shaft
94 by a set screw 96. A pointer 93 is fixed to bracket 14 adjacent
wheel 88 to cooperate with graduations 90 and indicia 92. Shaft 94
is mounted for rotation in bronze bushings 98 pressed into axially
aligned holes 100 extending through arms 102 of bracket 14. Shaft
94 has a tang 104 adjacent one end which is received in a slot in
windage screw 35 and is urged into firm engagement with screw 35 by
a compression spring 106 bearing on the other end of shaft 94.
Spring 106 is retained in the bushing 98 adjacent the other end of
shaft 94 by a set screw 108.
The way in which range finder device 10 functions to indicate the
distance to a target is schematically illustrated in FIG. 5. In
FIG. 5 both the center line and line of sight of gun sight
telescope 16 are represented by line 112 with rifle 22 and gun
telescope 16 located at point 114 on the zero yard line. With gun
sight telescope 16 in this position range telescope 24 will be
located at point 116 on the zero yard line with its center line
laterally spaced from and generally parallel to center line 112 as
indicated by center line 118. Graduated wheel 88 is rotated so that
screw 35 is retracted which allows spring 86 to sweep the free end
of sleeve 76 in a horizontal plane to the right (as viewed in FIG.
4). This sweeps the line of sight of range telescope 24 as
indicated by broken line 120 in FIG. 5 in a generally horizontal
plane to the right across the line of sight 112 of gun telescope
16. The distance between the location 114 of gun telescope 16 and
the point at which lines 120 and 112 cross will be proportional to
the angular displacement of line of sight 120 of range finder
telescope 24 with respect to line of sight 112 of telescope 16 as
indicated by .theta..sub.1 through .theta..sub.4. By knowing the
lateral distance or spacing between the center lines 112 and 118 of
gun sight telescope 16 and range finder telescope 24 and the angle
between the lines of sight 112 and 120, the distance from point 114
or the range finder 10 to the point of crossing of lines 112 and
120 can be calculated by the methods of plane geometry. If line of
sight 120 is swept or shifted until the point at which it crosses
line of sight 112 is coincident with a target then the distance
between the target and device 10 is equal to the distance between
point 114 and the point of crossing of lines of sight 112 and 120.
The angular position of line of sight 120 is dependent upon the
pivotal position in a horizontal plane of the longitudinal axis of
sleeve 76 and lenses 72 and 74 with respect to the center line of
telescope 24 and is thus proportional to the displacement of
windage adjusting screw 35. Hence, the displacement per revolution
or pitch of screw 35 is proportional to the angular displacement of
line of sight 120 and the distance between range device 10 and the
target or point of crossing of lines of sight 112 and 120 of gun
and range telescopes 16 and 24. Thus the graduations 90 and indicia
92 are spaced about the periphery of wheel 88 in proportion to the
displacement of screw 35 by rotation of the wheel to provide an
indication of the distance between a target and range finder device
10.
In operating range finder device 10, gun sight telescope 16 of
rifle 22 is sighted on or aimed at the bull's-eye of a target 122
as shown in eyepiece 20 of FIG. 2 and then knurled wheel 88 (FIGS.
1 and 4) is rotated to turn adjusting screw 35 and optically shift
the image of vertical hair line 34 of range telescope 24 from the
phantom to the solid line position shown in eyehole 52 of FIG. 2 so
that the lines of sight of both telescopes 24 and 16 are
simultaneously sighted on or aimed at the bull's-eye of target 122.
The graduation 90 which is most nearly aligned with pointer 93 and
indicia 92 on wheel 88 are then viewed to determine how far away
target 122 is from the range finder device 10 on rifle 22. For
example, if wheel 88 is manipulated so that both range and gun
telescopes 24 and 16 are sighted on the bull's-eye of target 122
when their lines of sight 120 and 112 cross at point 124 of FIG. 5,
a graduation 90 on wheel 88 will be aligned with pointer 93 and the
graduation's associated indicia 92 will indicate that target 122 is
300 yards away from rifle 22 and range finder 10 mounted
thereon.
* * * * *