IMPROVEMENTS IN APPARATUS FOR TRANSMITTING MOTION TO SPEED INDICATORS
Year: 1884

page_text: I JAMES MURDOCH NAPIER of York Road Lambeth in the County of Surrey
Engineer do hereby declare the nature of my invention for "IMPROVEMENTS IN
APPARATUS FOR TRANSMITTING MOTION TO SPEED INDICATORS" to be as follows:-
My improvements are designed for the transmitting of motion to speed indicators
attached to locomotives or their tenders, guard's vans, railway carriages and
generally to railway trains and consist in the employment of a mechanical
arrangement for the purpose in which a friction wheel or roller formed at its
circumference of leather or other suitable material is kept in contact with a
locomotive or other railway axle so that it is caused to turn at a rate of speed
in relation to that of the axle in accordance with the proportion of their
circumferences.
The friction roller is mounted in a swing frame attached to an axis fixed to the
body or framework of the locomotive or tender, guards van or railway carriage or
that part which is supported upon springs and which rises and falls in respect to
the axles.
The swing frame is actuated by a spring or springs to keep the friction roller in
proper contact with the axle and to reduce the necessary action of the swing frame
as much as possible I place the friction roller at the side of the axle and not at the
top or bottom-I transmit the motion from the friction wheel or roller by fixing to
it or on its spindle a toothed wheel-and on a spindle passing through the fixed
axis on which the swing frame vibrates I fix another toothed wheel which gears
with the first toothed wheel and is driven by it while from the spindle of the
second toothed wheel or that spindle mentioned as passing through the axis of the
swing frame I transmit the motion to the speed indicator by any convenient
connections suitable to the relative positions of the speed indicator and the axle
from which it is to be driven such as by spindles with gearing or driving bands
and pullies or well known means.
CARPMAEL & Co.,
Agents for the Applicant.

page_text: COMPLETE DIVIFICATION.
I JAMES MURDOCH NAPIER of York Road Lambeth in the County of Surrey
Engineer do hereby declare the nature of my invention for "IMPROVEMENTS IN
APPARATUS FOR TRANSMITTING MOTION TO SPEED INDICATORS" and in what
manner the same is to be performed to be particularly described and ascertained
in and by the following statement:-
My improvements are designed for the transmitting of motion to speed indicators
attached to locomotives or their tenders, guard's vans, railway carriages and
generally to railway trains and consist in the employment of a mechanical
arrangement for the purpose in which a friction wheel or roller formed at its
circumference of leather or other suitable material is kept in contact with a
locomotive or other railway axle so that it is caused to turn at a rate of speed
in relation to that of the axle in accordance with the proportion of their
circumstances..
The friction roller is mounted in a swing frame attached to an axis fixed to the
body or framework of the locomotive or tender, guards van or railway carriage or
that part which is supported upon springs and which rises and falls in respect to
the axles.
The swing frame is actuated by a spring or springs to keep the friction roller in
proper contact with the axle and to reduce the necessary action of the swing frame
as much as possible I place the friction roller at the side of the axle and not at the
top or bottom. I transmit the motion from the friction wheel or roller by fixing to
it or on its spindle a toothed wheel and on a spindle passing through the fixed axis
on which the swing frame vibrates I fix another toothed wheel which gears with
the first toothed wheel and is driven by it while from the spindle of the second
toothed wheel or that spindle mentioned as passing through the axis of the swing
frame I transmit the motion to the speed indicator by any convenient connections
suitable to the relative positions of the speed indicator and the axle from which it
is to be driven such as by spindles with gearing or driving bands and pullies or
other well known means.
In order that my said Invention may be most fully understood and readily
carried into effect I will proceed to describe the Drawings hereunto annexed.
DESCRIPTION OF DRAWINGS.

page_text: or to the spindle a thereof and gears with the toothed wheel H which is fast on
the spindle I which passes through the joint connecting the frame D with the
bracket F. Two bushes b. b. are fitted and fixed to the bracket F and while the
centre holes in these bushes serve as bearings for the spindle I the ends of
the bushes projecting inwards form bearings for carrying the swing frame D the
holes in the upper part of which are suitably fitted to that portion of the bushes
which projects inwards from the bracket F. The bushes b may be screwed to the
bracket or otherwise arranged so as to be easily removeable to facilitate the putting
together and taking asunder of the apparatus. From the spindle I which is thus
caused to rotate by its connection with the axle A through the friction wheel or
roller B and toothed wheels G and H motion is transmitted to the speed indicator
by any suitable connections convenient to the situation and relative positions of
the speed indicator and the axle A from which it is to be driven having regard to
the arrangement or construction of the locomotive or the tender the guard's van or
railway carriage to which it is desired to attach a speed indicator.
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
The combination of apparatus for transmitting motion to a speed indicator
substantially as described; such combination comprising a wheel driven by friction
contact with the axle a frame carrying the said wheel and maintaining it constantly
in proper driving contact and gear wheels or other equivalent means transmitting
the rotary movement to a spindle carried by a fixed bracket or support:
17
71
CARPMAEL & Co.,
Agents for the Applicant.