Rear Sight for Guns Page: 6 of 9
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1,357,096
tested, for convenience of assembling the
elements mounted therein.
This casing is provided with a chamber
F to inclose the range drum H, and the
5 chamber is reduced to fit snugly over the
toothed portion I' of the operating shaft I,
one end of which is journaled as at i in the
casing F, as shown in Figs. 5 and 6, and the
other end is hollowed, as at I , to receive the
10 spring J and the operating shaft K carrying
the hand knob K' with the roughened outer
face J'. This opening I is also provided
with slots i' to receive the spline ribs k of
the shaft K, and the hollow portion of the
15 shaft I is provided with exterior slots j2 to
engage the inwardly projecting ribs A' from
the range drum H, as shown most clearly in
Fig. 7.
The spring J normally tends to press the
20 shaft K outward, causing the roughened face
l' to engage the roughened face f/ of the
lug F3 carried by the casing. This casing is
provided with guide grooves f for the bars
e of the sight leaf, and it is also provided
25 with a guideway F4, with guide slots f4 to
engage the guide ribs 7n of the slide M, pro-
vided with the opening m0 through which
a limited portion only of the range scale
may be seen.
30 The range drum has a spiral rib A which
engages with the worm grooves m' in the
slide M, and this range drum is also pro-
vided with a spiral scale, as shown most
clearly in Figs. 5 and 8. The numerals on
35 this drum are preferably stamped in the
same, and the recess is filled with luminous
material so that the numerals will be visible
at night.
In order to have the number correctly
40 lined up, when the sight is used at night, I
provide a pocket flb, see Figs. 3 and 11, in
the slide M which may be filled with a lumi-
nous composition, such as radium paint. In
order to close the drum chamber of the cas-
45 ing when not in use, I provide a sliding
cover N preferably made of a resilient leaf
spring having the lug n by means of which
the spring may be slid backward or forward
in the corresponding grooves beneath the
50 flanges 71t. The ends n' of this leaf spring
cover are adapted to spring down into the
curved portions mA of the grooves referred
to and abut against one or the other of the
shoulders i', see Fig. 11, so that the spring
55 cover may be prevented from accidentally
sliding to the position for masking the open-
ing in0. Thus this spring cover N may be
slid to either end of the slide M when it is
desired to unmask the opening M , as shown
60 in Fig. 5, or it may be moved to the position
for masking said opening, as shown in Fig. 6.
The casing carries a lug P projecting
down between the bars e of the leaf E, which
constitutes the ordinary rear sight for use
65 in daytime. This lug is provided with apeep opening p , and with the usual notch
p, as shown most clearly in Fig. 3. This lug
may also be provided with the pin p' to
support the free end of the sliding bar Q,
which constitutes the rear sight attachment 70
for use at night.
This sliding bar Q is shown in the posi-
tion for use in night firing in Fig. 2, and in
the concealed position for firing by day in
Fig. 3. 75
This sliding bar carries two luminous dots
q, one at each side of the peep opening q ,
which peep opening is also preferably pro-
vided with the notch q' adapted to register
with the notch p when the sliding bar Q is 80
in the position shown in Fig. 2.
This sliding bar Q is also provided with a
thumb notch q- so that the bar may be con-
veniently drawn from the position shown in
Fig. 3 and moved to that shown in Fig. 2. 85
In order to conveniently assemble the slid-
ing bar Q in the casing, I provide a rib q?
which slides in a keyway in the casing, as
shown in Figs. 4 and 7, and the rear end of
the bar Q may be provided with a notch q' 90
to engage the stop pin or bolt R, see Figs. 3
and 4, which prevents said bar from being
moved too far to the left, or accidentally
dropped out of the casing F.
The rib 93 is cut away, as at q' see Fig. 95
12, to ride over and rest upon the pin p'
when the sliding bar Q is moved to the po-
sition shown in Fig. 2, and this pin p'
engages the shoulder q , see Fig. 12, when
the notch q' is in the position to register 100
with the notch p of the tlay sight. The bar
Q may be clamped in the desired position as
shown either in Figs. 2 or 3 by means of -a
suitable set screw S. When used for firing
by day, the notch p of the day sight is 105
brought into alinement with the tip of the
ordinary front sight; but when used for
night firing the luminous attachment of the
front sight is turned up, and the bar Q being
shown moved to the position indicated in 110
Fig. 2, the marksman will note three lumi-
nous dots; and when the dot b of the front
sight is midway between the two luminous
dots q of the rear sight, he will have the
true line of sight, and if this line bears on 115
the target the piece will be properly pointed.
In order to disassemble the parts it will
simply be necessary to remove the screw
bolts G and R, and the casing may be re-
moved, and the parts contained therein, may 120
be readily withdrawn. In order to assem-
ble the parts, reverse the operation.
The operation of the device is as follows:
Before the leaf is turned down in the
normal position for transporting the piece, 125
the casing F will be moved down to the
lower or zero position, at which time the
scale on the drum registering with the open-
ing 0n will show zero, and the parts will be
in the position shown in Fig. G. Now if 1302
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Reference the current page of this Patent.
Kaempfer, Effie May Wagner. Rear Sight for Guns, patent, November 18, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1258050/m1/6/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.