Improvements in Range Indicators for Gun Sights.
Year: 1895

page_text: Date of Application, 26th Oct., 1895
Complete Specification Left. 27th July, 1896-Accepted, 29th Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in Range Indicators for Gun Sights.
I, HUBERT HENRY GRENFELL, of 18 Ashburn Place, in the County of
London, Captain Royal Navy, do hereby declare the nature of this invention to be
as follows:-
My invention relates to range indicators for gun sights and comprises a flexible
band or belt preferably a metal band on which distances denoting ranges are
marked and two drums or pulleys to which the ends of the band are fixed and
round which the band is rolled in such a manner that by rotating the drums in one
direction the band is given off by one drum and wound up on the other and by
rotating the drums in the other direction the band is transferred back again to
the first drum. The said drums and band are enclosed in a suitable case attached
to or formed with the socket of the sight bar, and the spindles on which the
drums are mounted are connected by gearing with the spindle of the rack pinion
for raising and lowering the sight bar. An opening which may or may not be
glazed is provided in the aforesaid case enclosing the band so that the indications
afforded by the band may be seen through said opening. A suitable datum line,
arrow, or finger is provided at the side of the opening, or when the opening is
glazed a mark may be made on the window to serve as the reading point. Guide
rollers running loosely on pins are provided to cause the band to travel close to
the opening or window in the case. In order to keep the band tight and to allow
for the varying diameters of the drums due to the winding of the bands on and off
I mount one drum loosely on its spindle and connect it to the spindle by a spiral
spring one end of which is attached to the drum and the other end to the spindle
and so arranged that it tends to turn the drum and thereby exerts a pull on the
band thus maintaining the band in tension. The said drum is preferably made
hollow to receive the spring.
The band is set initially to read 0 yards when the sight is at zero.
When the hand
wheel for moving the sight bar up and down is turned, the drums on which the
band is wound are also rotated by the connecting gearing before mentioned and
the band is moved past the window opening in the casing, the divisions on the
band arriving at the datum line or arrow mark in agreement with the positions of
the sight, and thus correctly denoting the range.
Dated this 26th due of October 1895
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.
Improvements in Range Indicators for Gun Sights.
I, HUBERT HENRY GRENFELL, of 18 Ashburn Place, in the County of
London, Captain Royal Navy, do hereby declare the nature of this invention and
in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement :-
My invention relates to range indicators for gun sights and comprises a band or
belt preferably a metal band, on which distances denoting ranges are marked,
and two drums or pulleys to which the ends of the band are fixed and on which

page_text: the band is wound in such a manner that by rotating the drums in one direction
the band is given off by one drum and taken up by the other and by rotating the
drums in the other direction the reverse action takes place. The said drums and
band are enclosed in a suitable case attached to, or formed integrally with, the
socket of the sight bar, and the spindles on which the drums are mounted are
connected by gearing with the spindle of the rack pinion for raising and lowering
the sight bar. An opening, which may or may not be glazed, is provided in the
aforesaid case enclosing the band so that the indications afforded by the band may
be seen through said opening.
Referring to the accompanying drawings,
Figure is a rear view of a gun sight fitted with my improved range
indicator.
Figure 2 is a sectional side elevation thereof, and
Figure 3 is a section on the line a, a Figure 2.
Like letters denote corresponding parts throughout the drawings.
D is the
A is the sight leaf, B is the sight bar, C is the range indicator.
flexible band or belt on which the ranges are marked. E, E are the drums or
pulleys on which the said band is wound. e, e' are the spindles of the drums E, E¹.
F is the case or box enclosing the flexible band and the drums E, E. G is the
socket of the sight bar. H is the ordinary spindle for raising and lowering the
sight bar said spindle being geared to the toothed rack B₁ of the sight bar by a
pinion H¹. On the spindle H is a toothed wheel H' which gears with toothed
pinions on the spindles e e¹ so that when the spindle H is rotated by its hand
wheel H³ to raise or lower the sight bar the drums E, E' are at the same time
rotated and the band D is wound on one of the said drums and paid off the other.
The drum E' is connected to its spindle by a spiral spring E2 one end of which is
attached to the drum and the other end to the spindle and so arranged that it
tends to turn the drum and exert a pull on the band thus maintaining the band in
tension. The drum E' is preferably made hollow to receive the spring. F' is the
opening or window to allow of observing the readings on the band. A suitable
datum or reading mark J is provided at the side of the opening F1 or when the
opening is glazed a mark may be made on the window to serve as the reading
point. Guide rollers K, K mounted loosely on fixed pins K', K' are provided to
cause the band to travel close to the opening or window F'.
The band is set initially to read 0 yards and when the hand wheel II³ for
moving the sight bar up and down is turned the drums on which the band is
wound are also rotated by the connecting gearing above described and the band is
moved past the window or opening in the casing, the divisions on the band
arriving at the datum line or arrow mark in agreement with the positions of the
sight, and thus correctly denoting the range.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what
I claim is
1. For a gun-sight a range-indicator comprising a graduated band or belt
wound on drums which are geared to the spindle that actuates the sight bar, and a
datum or reading mark past which the band is caused to travel, substantially as,
and for the purpose, specified.
2. In the aforesaid range indicator the drum connected to its spindle by means
of a spring substantially as, and for the purpose, specified.
3. A combined range indicator and sight substantially as described with
reference to the accompanying drawings and operating as specified.
ל ..נמ
CTI
1000
HASELTINE, LAKE & Co.,
45 Southampton Buildings, London, W.C., Agents for the Applicant.