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Патент USA US2407186

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Sept-3, 1946.
J. M. STRANG ETAL
2,407,186
RANGEFINDER,‘ HEIGHTFINDER, AND LIKE MEASURING INSTRUMENT
Filed Dec. 1, 1944
2 Sheets-Sheet 1
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Sept. 3, 1946-
J. M. sTRANG ET AL
2,407,185
R-ANGEFINDER, HEIGHTFINDER, AND LIKE MEASURING INSTRUMENT
Filed Dec. 1, 1944
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MARTW STRANCT
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2,407,186
Patented Sept. 3, 1946
UNITED STATES PATENT OFFICE
RANGE FINDER, HEIGHT FINDER, AND LIKE
MEASURING INSTRUMENT
John Martin Strang and Claud FosterQGlasgow,
Scotland, as‘sig‘nor to Barr & Stroud, Limited,
Glasgow, Scotland '-'
Application December 1, 1944, Serial No. 566,221
In Great Britain March 14, 1941
v
5 Claims-‘7 (01. sis-2.7)
2
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V
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This invention relates to rangeflnders, height
?nders, and like optical measuring instruments
of the self-contained base type, hereinafter re-'
ferred to as range?nders. Such instruments com
prise. a tubular base casing,‘ light entrance,
windows, one at or near each end of the base.
casing, and two end re?ectors within the base
.
guide located on'and turning with the base cas
ing, being coaxial therewith, and an actuating
member which is movable parallel‘with the said
axis and engages with the‘ cam guide so as‘ to‘be
moved by rotation of the said guide, so operating
the erecting prism.‘
The invention will now be described with refer
casing, to receive light entering through the,
windows and to direct it along'the base casing
ence to the accompanying drawings, in which:
Figure 1 is a sectional plan View of a range
by way of an objective to'a central re?ecting sys-_
tem at orlnear the middle of the base casing.
The central re?ecting system then directs the
two beams of light at or approximately at right
angles‘to the baseto an eyepiece or to binocular
?nder,
eyepieces, there being in one or both beams of 7, 15
light a movable light deviating prism element by
movement of which measurement is effected; ‘
The invention is concerned with what may be
termed ?xed eyepiece range?nders, i. e. ‘instru
ments in which the eyepiece (or eyepieces) re
mains stationary while the line of sight from the .
instrument to the object under observation is ele
Figure 2 is a sectional view at, right angles to
the axis of the instrument, and
Figure 3 is a sectional view through the eye
piece mounting. _
The ?gures show a range?nder comprising ‘a
tubular base casing A, an outer tubular bearing
composed of two parts B1, B2, in which the base
casing A is rotatable about its axis, and an eye
piece mounting C carried by and projecting from
the outer bearing 31..
‘The tubular base casing A has light entrance 1
windows I, one at each end; and end‘pentagonal ‘
vated or depressed, ' in contradistinction to the
prisms 2, and within the base casing A there is
of the line‘ of sight involves ‘corresponding inclinai “
tional movement of the eyepiece.
prism ‘combination E also carried by the inner“
type of instrument in which the movement of, the ‘ _ ._ an inner frame tube D which carries-objectives 3.
instrument necessary for‘elevation or depression 25 At a central position there is a central re?ecting
frame tube D. The inner frame D rotates with
easing A, the ‘base casing A and the
In ?xed eyepiece range?nders, the inclination; cthe'?base
1, inner frame D being apertured at 4 and 5 respec-
of certain optical parts relative to other optical .
‘
parts which remain stationary with ‘the ‘eyepiece 30 tively.‘ to permit of‘ light passing from the inner
ordinarily would have the effect of tilting the, ' frame D to the eyepiece mounting C. Prisms C1
remain stationary with‘the‘eyepiece mounting C.
images in the ?eld of view. This tilting effect,‘
Just within the right hand “window I there are
can be annulled by means of a movable erecting
prism through which light passes in its path from A‘ Y, two measuring’pris‘ms B which are arranged to
the central re?ecting system to the ‘eyepiece, this 35 ‘be rotated by equal amounts in opposite senses
erecting prism being rotated at half the angular '
speed at which the base casing turns in‘elevat-p
ing or depressing the line of sight.
simultaneously by means of bevel gearing 1 opere ‘
ated by an. operating head :8. Range measure
referred to can be conveniently effected.‘ 7
bearings 9 and Ill, and the interior of the instru
ment'isz‘e?ected by rotation of these prisms 6,'
‘
The present invention is concerned with means I‘ , “the-instrument being of coincidence type.
The base casing A is rotatable in ball and roller '
whereby rotation of an erectingyprism such'as
ment‘is sealed‘ from ‘the outer atmosphere by
According to this invention; in a ?xed eyepiece.
labyrinth arrangements ll of annular form‘, one‘
range?nder, the“ rotation of thebase casing in
on each side of the apertures 4 and 5.
elevating or depressing the line‘ of sight effects
rotation of the erecting prism through the medium :45 l A worm shaft I2 operated by an operating head,
not shown, passes through the bearing B1 and
of a cam device of helical or scroll form (or sub
engages with a ‘worm wheel‘ l3 ?tted around the
base casing ‘A and‘serves to turn the base casing
A about its axis for elevation and depression of
between the angular speed of the base casing
and that of the erecting prism, viz. two to one. 50 the line of sight, the eyepiece mounting C and
associated parts remaining stationary. 1
Mechanism of this nature can be incorporated
In order to prevent tilting of the images, the
compactly and conveniently into the range?nder
following
arrangement is adopted. Within the
structure.
'
eyepiece mounting C there is a cylindrical prism
In carrying the invention into practice, the
arrangement may comprise a helical or scroll cam 55 carrier I4 which carries an erecting prism ii of
stantially of that form) the pitch or lead of which
is designed to ‘give the necessary relationship
3
2,407,186
4
the shape shown. Prism carrier I4 is rotatable
in the eyepiece mounting C about the axis of the
eyepiece and at its end remote from the eye
carried by the bearing between the prism combi
nation aforesaid and the eyepiece and through
which the light is directed in its path from the
prism combination to the eyepiece, a carrier for
piece has a circular rack I6. A rod or bar I‘! is
supported so as to be capable of sliding trans
said erecting prism, said carrier being rotatable
relative ‘to the bearing,~a scroll-shaped cam 10
catedon the‘ outside of the wall of the base casing
co-axially with and turning with said base casing,
versely relativerto the axis of the eyepiece and
has a rack‘ part which engages with the circular
rack I6. On the outside wall of the tubular base
casing A there is a helical or scroll shaped cam
guide I 8 and the red I‘! has a roller 19' which
a guide on the bearing, a rod slidable linearly
in said guide, the rod engaging with the cam so
engages with the cam guide I8.
v
as to be moved linearly on rotation of the base
These parts are so designed that, as‘ the base‘
casing, a straight rack on said rod, and a circular
casing A is turned about its axis, the prism car
rack on said carrier engaging with said straight
rier I4 and erecting prism I5 are turned about
rack to: convert linear movement of the rod into
the axis of the eyepiece at half the angular speed 15 rotational movement of the carrier at half the
of the base casing.
angular speed of rotation of the base casing.
We claim:
4. A ?xed eyepiece range?nder comprising a
1. A ?xed eyepiece range?nder comprising‘ a
bearing, a base casing which is rotatable in the
bearing, a base casing which is rotatable‘ in the
bearing‘ for varying the elevation of the line of
bearing for varying the'elevation of the line of
sight, an eyepiece mounting of tubular form ?xed
sight, an eyepiece ?xedly carried by the bearing,
on and projecting from said bearing at right an
a prism combination ?xed in position relative to
gles to the axis of rotation of the base casing, an
the bearing to receive light from the base cas
eyepiece carried by said eyepiece mounting,’ a
ing and transmit it through an aperture provided
prism combination ?xedly carried by said bear
in the base casing to the eyepiece, an erecting 25 ing in position to receive light from the base cas
prism carried by the bearing between the prism
ing and transmit it through an aperture provided
combination aforesaid. and the eyepiece and
in the base casing to the eyepiece, a carrier rotat
through which the light is directed in its path
able within the eyepiece mounting, an erecting
from the prism combination to the eyepiece, a
prism mounted in said carrier for rotation there
carrier for said erecting prism, said carrier being 30 with and through which the light from the prism
rotatable relative to the bearing, and scroll cam
combination passes in its path to the eyepiece,
mechanism connecting the base casing with said
and scroll cam mechanism connecting the base
carrier to rotate said carrier and erecting prism
casing with said carrier to rotatesaid carrier and
from said base casing at half the angular speed of
erecting prism from said base casing at half the
rotation of said casing, said scroll cam mecha 35 angular speed of rotation of the base casing, said
nism including a scroll-shaped cam rotatable
scroll cam mechanism including a scroll-shaped
about the axis of the scroll and a linearly movable
cam rotatable about the axis of the scroll and a
member engaging with said cam for the trans
linearly movable member engaging with said
mission of motion from said casing to said carrier.
cam for the transmission of motion from said
2. A ?xed eyepiece range?nder comprising a 40 casing to said carrier.
bearing, a base casing which is rotatable in the
bearing for varying the elevation of the line of
sight, an eyepiece ?xedly carried by the bearing,
a prism combination ?xed in position relative to
the bearing‘ to receive light from the base casing
and transmit it through an aperture provided in
the base casing to the eyepiece, an erecting‘prism
carried by the bearing between the prism combination aforesaid and the eyepiece and through
which the light is directed in: its path from the
prism’ combination to the'eyepiece, a carrier for
said erecting prism, said carrier being; rotatable
relative to the bearing, a scroll-shaped cam lo
cated co-axially 'on and turning with the base
casing, an actuating member engaging with said
5. A ?xed eyepiecerange?nder comprising a
bearing, a base casing which is rotatable in the
bearing for varying the elevation of the line of
sight, an eyepiece mounting of tubular form ?xed
45 on and, projecting from said bearing at right an
gles to the axis of rotation of the base casing, an
eyepiece carried by said eyepiece mounting, a
prism combination ?xedly carried- by said hear
’
ing in position to receive light from the base cas
ing and transmit it through an aperture provided
in the base casing to the eyepiece, a carrier, rotat
able within the eyepiece mounting, an erecting
prism mounted insaid carrier for rotation there'
with and through which the light from the prism
55 combination passes in its path to the eyepiece, a
50
cam so as to be moved linearly on rotation of
"scroll-shaped cam located on the outside of the
said cam, and means for converting linear move—
ment of the actuating member into rotational‘
movement of the carrier at half the angular speed
wall of the base casing co-axially with and turn
ing with said base casing, a‘guide on the bearing,
a rod slidable linearly in said guide, the rod en
60 gaging with the cam so as to be moved linearly
of rotation of the base casing.
on rotation of the base casing, a straight rack on
3. A ?xed eyepiece range?nder comprising a
said rod, and a circular rack on said carrier en
bearing, a base casing which is rotatable in the
gaging With said straight rack to convert linear
bearing for varying vthe elevation of the line of
sight, an eyepiece ?xedly carried by the bearing,
movement of the rod into rotational movement
a prism combination ?xed in position relative to 65 of the carrier at half the angular speed of rota
the bearing to receive light from the base casing " tion of the base casing.
and transmit it through an. aperture provided in
MARTIN 'STRANG.
the base casing to the eyepiece, an erecting prism
CLAUD FOSTER.
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