Improvements in Training-gear for Gun-mountings.
Year: 1889

page_text: Date of Application, 12th Nov., 1889
Complete Specification Left, 8th Aug., 1890-Accepted, 8th Nov., 1890
PROVISIONAL SPECIFICATION.
Improvements in Training-gear for Gun-mountings.
We, PER NORDENFELT of 32 Victoria Street in the City of Westminster Engineer
and ERNST TERNSTRÖM of the same place, Engineer, do hereby declare the nature of
this invention to be as follows :—
To
In training gear for guns it is important that there should be no back lash in the
gearing by which the training of the gun in a horizontal direction is effected.
effect this we employ frictional gear for gearing the rear end of the swivelling
carriage or slide upon which the gun is mounted with the circular circumference of
the platform upon which the carriage or slide is supported. We form a V groove
along the outer face of the racer or rail which is around the circumference of the
platform and we cause the correspondingly shaped circumference of a ring to engage
with this groove. The ring we carry between two flanges on a vertical axis carried
by bearings from the carriage or slide. Between the inner circumference of the ring
and the axis we interpose springs which normally tend to hold the ring concentric
with the axis but yet allow of its being forced into a position eccentric thereto. То
cause the ring to revolve with the axis a projecting stul on the ring is made to enter
a radial groove in one of the flanges between which the ring is held.
The bearings which carry the axis are so adjusted that the side of the ring which is
for the time engaging with the groove in the racer is always nearer to the axis than
the opposite side, thereby compressing some of the springs and giving the necessary
pressure between the ring and the groove. In this way also the ring is held into
the groove with sufficient pressure even should the circumference of the racer not be
accurately concentric with the axis around which the carriage or slide swivels. The
axis which carries the friction ring may be revolved by gearing actuated by a hand
wheel in the ordinary manner.
Dated this 9th day of November 1880
CARPMAEL & Co.,
Agents.
COMPLETE SPECIFICATION.
Improvements in Training-gear for Gun-mountings.
We, PER NORDENFELT, of 32 Victoria Street. in the City of Westminster, Engineer,
and ERNST TERNSTRÖM of the same place, Engineer, 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 :-
In training gear for guns it is important that there should be no back lash in the
gearing by which the training of the gun in a horizontal direction is effected. To
effect this we employ frictional gear for gearing the rear end of the swivelling carriage
or slide upon which the gun is mounted with the circular circumference of the platform
upon which the carriage or slide is supported. We form a V groove along the outer face
of the racer or rail which is around the circumference of the platform and we cause
the correspondingly shaped circumference of a ring to engage with this groove.
The
ring we carry between two flanges on a vertical axis carried by bearings from the
carriage or slide. Between the inner circumference of the ring and the axis we
interpose springs which normally tend to hold the ring concentric with the axis but
yet allow of its being forced into a position eccentric thereto. To cause the ring to
revolve with the axis a projecting stud on the ring is made to enter a radial groove
in one of the flanges between which the ring is held.
The bearings which carry the axis are so adjusted that the side of the ring which is

page_text: for the time engaging with the groove in the racer is always nearer to the axis than
the opposite side, thereby compressing some of the springs and giving the necessary
pressure between the ring and the groove. In this way also the ring is held into
the groove with sufficient pressure even should the circumference of the racer not be
accurately concentric with the axis around which the carriage or slide swivels. The
axis which carries the friction ring may be revolved by gearing actuated by a hand
wheel in the ordinary manner.
Figure 1. of the drawings annexed is a back view of part of a gun mounting with
training gear constructed as above described applied to it.
Figure 2 is a vertical section on a larger scale of the friction ring and parts in
connection with it.
Figure 3 is a plan view of Figure 2.
Figures 4 and 5 are a vertical section and plan of the upper disc or flange on the
vertical axis.
Figures 6 and 7 shew one of the springs which are interposed between the ring and
the axis.
A is the swivelling carriage upon which the gun is mounted-the dotted circle B
shews the position of the gun in the mounting. C is the circular platform above
which the carriage rests a ring of rollers being interposed between the two in the
ordinary way. D is a V groove formed around the outer face of the racer or rail E
which is around the circumference of the platform. F is the ring which is pressed
into the groove D.
GH are two discs between which the ring lies-the disc G is fast on the lower end
of a tubular boss I which is keyed on to the lower end of the vertical driving axis J
and the other disc H is scrowed on to the boss above the ring. The axis J is carried
in bearings fixed to the swivelling carriage A. KK are springs interposed botween
the ring and the boss. L is a pin screwed into the ring and having its lower end
projecting downwards from it and entering a radial slot M in tho disc G. N is a bevil
wheel fast on the top of the axis J, and which can be driven by a corresponding
wheel O on a horizontal axis P which can be revolved by a hand wheel Q upon it.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
1. Friction traversing or training gear for gun mountings consisting of a groove D
formed around the circumference of the circular platform Cupon which the swivelling
gun carriage rests, a vertical axis J mounted in bearings upon the swivelling carriage
discs G H on the lower end of this axis a ring F lying between these discs and having
a portion of its circumference entering the groove D, springs K interposed between
the ring and the axis and a pin L projecting from the ring and entering a radial
groove in one of the discs.
2. The construction of training gear for gun mountings substantially as horein-
before described.
A
T
TI
1000
CARPMAEL & Co.,
Agents for the Applicants.