Improvements in Sights for Ordnance.
Year: 1898

page_text: Date of Application, 22nd Mar, 1898
Complete Specification Left, 4th Nov., 1898-Accepted, 23rd Dec.,
1898
Date of Application, 22110 Mar, 1000
Complete Specification Left, 4th Nov., 1898-Accepted, 23rd Dec.,
1898
PROVISIONAL SPECIFICATION.
Improvements in Sights for Ordnance.
I, AUGUST REICHWALD, of 9, New Broad Street, in the City of London, Steel,
Iron, Metal and Mineral Merchant, do hereby declare the nature of this inven-
tion (a communication to me from abroad by the Firm of Fried Krupp, of
Essen, in the Empire of Germany, Cast Steel Manufacturers), to be as follows;
-
In the known constructions of the back sights of guns, the arrangement is
such that the worm which serves for adjusting the back sight bar is capable
of being moved in opposition to the pressure of a spring out of engagement
with the back sight bar, in order to enable the approximate adjustment of the
back sights to be effected directly by hand so as to save time. But as in
this arrangement by reason of the yielding support or bearing of the
worm, the back sight bar might get shifted in consequence of jumping of tho
gun, the back sight bar must be secured after being adjusted, by means of a
clamping screw.
Now the present invention relates to a back sight for guns in which not-
withstanding the screw for clamping the back sight is dispensed with, the back
sight will remain with perfect certainty in its adjusted position for the pre-
scribed range, even during a rapid firing of the gun, whilst the worm is adapted
to be placed at any time out of gear with the back sight bar.
According to my invention the worm which is fixed to a small hand wheel,
is rotatably mounted in an arm of the back sight casing. The worm bears with
a collar or shoulder against a spring which has its abutment against the closing
sleeve which latter is screwed into the arm. The sleeve serves to guide the
worm and to limit the rearward travel of the latter. The adjusting sleeve which
screws on to the arm acts with the worm in such a manner that it bears against
a collar or shoulder on the worm, and also bears in the opposite direction
against a small handwheel. The arrangement is also such that the least possible
friction is produced between the worm or hand wheel and the adjustable sleeve.
When the approximate adjustment of the back sight for the prescribed range
is to be effected by pushing the back sight bar up and down by hand, the worm
must first be moved out of engagement with the teeth of the back sight. For
this purpose the adjusting sleeve is rotated through half a revolution towards
the left hand whereby it unscrews from the arm (provided with a double right
hand screw thread) of the back sight casing, and at the same time moves the
hand wheel together with the worm.
The pitch of the screw thread of the adjusting sleeve is made such that by
rotating the latter through one half a revolution, the worm moves out of
engagement with the teeth of the back sight.
Now after the back sight has been approximately adjusted by hand, the ad-
justing sleeve is rotated in the opposite direction. The helical spring which
was pressed against the closing cap or sleeve when the worm was moved out of

page_text: gear, and which was thereby placed under compression, now presses this worm
back again into the teeth of the back sight.
By rotating the small hand wheel in the forward or in the backward direc-
tion, the exact adjustment of the back sight is now effected in the usual manner,
by causing the scale mark for the prescribed range to coincide with the upper
surface of the back sight casing. In this operation the adjusting sleeve remains
stationary because the friction produced between it and the worm, or the hand
wheel, is smaller than the friction between it and the screw thread of the arm.
During the firing, the worm is not able to shift to the right hand, and so shift
the back sight, because the worm bears against the adjusting sleeve, and the
latter does not change its position during the firing.
Another form of construction according to this invention is constituted by
providing instead of the screw thread, an angularly bend groove or slot in the
arm, and into which groove there engage projections on the adjusting sleeve.
So long as the projections on the adjusting sleeve are situated in those parts
of the angularly bend groove which are directed at right angles to the longi-
tudinal axis of the worm, no movement of the worm can take place in the axial
direction. But if on the contrary the projections on the adjusting sleeve are
brought by rotating the latter into those parts of the angularly bent groove
which are situated parallelly or at a less than right angle to the axis of the
worm, the worm can then be drawn back and out of engagement with the back
sight rod.
It is also obvious that without altering the nature of this invention in any
way, the screw thread of the angularly bent groove might be arranged on the
worm, and that the adjusting sleeve might be connected with the arm in a
rotatable manner, but not so as to be capable of being moved along said arm.
Dated this 22nd day of March 1898.
BREWER & SON,
London and Leeds, Agents for the Applicant.
JUMI DI PUITICATION.
Improvements in Sights for Ordnance.
I, AUGUST REICHWALD, of 9, New Broad Street, in the City of London, Steel,
Iron, Metal and Mineral Merchant, do hereby declare the nature of this inven-
tion (a communication to me from abroad by the Firm of Fried Krupp, of
Essen, in the Empire of Germany, Cast Steel Manufacturers) and in what
manner the same is to be performed to be particularly described and ascer-
tained in and by the following statement:-
In the known constructions of the back sights of guns the arrangement is
such that the worm which serves for adjusting the back sight bar is capable
of being moved in opposition to the pressure of a spring out of engagement
with the back sight bar, in order to enable the approximate adjustment of the
back sight to be effected directly by hand so as to save time. But as in
this arrangement by reason of the yielding support or bearing of the
worm, the back sight bar might get shifted in consequence of the jumping of the
gun, the back sight bar must be secured after being adjusted, by means of a
clamping screw.
Now the present invention relates to a back sight for guns in which not-
withstanding the screw for clamping the back sight is dispensed with, the back
sight will remain with perfect certainty in its adjusted position for the pre-

page_text: scribed range even during the rapid firing of the gun, whilst the worm is adapted
to be placed at any time out of gear with the back sight bar.
The accompanying drawings illustrate a suitable form of the present inven-
tion. Figs. 1 and 2 shew the rear elevation of a part of the gun barrel with
the back sight mounted thereon.
(Fig. 1 shews the worm of the worm gear in engagement with the teeth of the
back sight bar, whilst Fig. 2 shews the worm out of gear therewith.)
Fig. 3 is a section through the worm gear on the line 3-3 of Fig. 1.
Fig. 4 illustrates the well known worm of the worm gear.
The worm a which is fixed to the small hand wheel f is rotatably mounted
in an arm of the back sight casing B Fig. 1. The worm bears with a collar
or shoulder against the spring d which has its abutment against the closing
sleeve which latter is screwed into the arm b. The sleeve e serves to guide
the worm
a and to limit the rearward travel of the latter. The adjusting
sleeve e which screws on to the arm b acts with the worm Al in
such a mannev that it bears against a collar or shoulder on the
worn, and also bears in the opposite direction against the small hand wheel.
The arrangement is also, as shewn, such that the least possible friction is pro-
duced between the worm a or hand wheel f and the adjusting sleeve e.
When the approximate adjustment of the back sight A for the prescribed
range is to be effected by pushing the back sight bar up and down by hand, the
worm a (Fig. 1) must first be moved out of engagement with the teeth of the
back sight A. For this purpose the adjusting sleeve e is rotated through half a
revolution towards the left hand, whereby it unscrews from the arm 6 (pro-
vided with a double right-handed screw-thread) of the back sight casing B,
and at the same time moves the hand wheel f together with the worm a with it.
The pitch of the screw thread of the adjusting sleeve e is made such that
by rotating the latter through one half a revolution, the worm a moves out of
engagement with the teeth of the back sight (Fig. 2).
Now after the back sight has been approximately adjusted by hand, the
adjusting sleeve e is rotated in the opposite direction and presses the worm
back again into the teeth of the back sight, so that the worm gear assumes
again the position shewn in Fig. 1. The helical spring d is provided to prevent
end play between the sleeve e and the worm a.
By rotating the small hand wheel f in the forward or in the backward direc-
tion, the exact adjustment of the back sight is now effected in the usual manner,
by causing the scale mark for the prescribed range to coincide with the upper
surface of the back sight casing. In this operation the adjusting sleeve e
remains stationary, because the friction produced between it and the worm,
or the hand wheel, is smaller than the friction between it and the screw
thread of the arm b.
During the firing, the worm is not able to shift to the right hand, and so
shift the back sight, because the worm bears against the adjusting sleeve e, and
the latter does not change its position during the firing.
Another form of construction according to this invention is constituted by
providing instead of the screw thread, an angularly bent groove or slot in the
arm b, and into which groove there engage projections on the adjusting sleeve c.
This arrangement is not specially shewn because it can be readily understood
without. So long as the projections on the adjusting sleeve e are situated in
those parts of the angularly bent groove which are directed at right angles to
the longitudinal axis of the worm a, no movement of the worm can take place
in the axial direction. But if on the contrary, the projections on the adjusting
sleeve e are brought by rotating the latter into those parts of the angularly
bent groove which are situated parallelly or at a less than right angle to the
axis of the worm a, the worm a can then be drawn back and out of engage-
ment with the back sight rod A.
It is also obvious that without altering the nature of this invention in any way,

page_text: the screw thread or the angularly bent groove might be arranged on the worm,
and that the adjusting sleeve might be connected with the arm 6 in a rotatable
manner, but not so as to be capable of being moved along said arm.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
1. A back sight for guns, in which an adjusting sleeve e is connected on one
hand in a rotatable manner with the worm a which produces the adjustment of
the back sight bar A, and is connected on the other hand by means of a screw
thread, an angularly bent groove, or the like, with the bearing or supporting
arm of the worm, so that the worm is prevented from unintentional axial
shifting, but is however able to follow an axial movement of the adjusting
sleeve.
2. The general arrangement and combination of parts comprising the gear
for the back sights of guns and ordnance all constructed and acting as and for
the purposes described and illustrated with reference to the accompanying
drawings.
Datel
1000
BREWER & SON,
London and Leeds, Agents for the Applicant.
BREWER & SON,
London and Leeds, Agents for the Applicant.