Improvements applicable to Pulleys for Steering Chains.
Year: 1898

page_text: Improvements applicable to Pulleys for Steering Chains.
I, ROBERT RISK, of Halidon Villa, Cambuslang, in the County of Lanark,
North Britain, Engineer, do hereby declare the nature of this invention to be
as follows, that is to say:-
My improvements applicable to pulleys are designed to render such pulleys
more suitable in use and less liable to become disarranged.
In such pulleys as hitherto constructed each pulley turns on a boss or central
pillar made in a piece with or fixed to a castiron sole plate which is to be fixed
to the deck or in some other position and according to my invention I make
the eye of the pulley large enough to permit of the insertion of a number of
anti-friction rollers between the inner bearing surface of the eye and the outer
bearing surface of the central pillar. A cover plate, fixed by a bolt screwed into
the central pillar, retains the pulley in place and is formed with a guard which
extends beyond the rim of the pulley and down to the sole plate to which it is
secured, thus preventing the "riding" or displacement of the chain or the rising
of the pulley when in use. Annular bearing pieces may be fixed to the sole
plate and the underside of the pulley to reduce friction; or ball bearings may be
used for this purpose if preferred.
Dated this Eighteenth day of October 1898.
EDMUND HUNT,
Applicant's Agent.
Improvements applicable to Pulleys for Steering Chains.
I, ROBERT RISK, of Halidon Villa, Cambuslang, in the County of Lanark,
North Britain, Engineer, do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement, that is to say:-
My improvements applicable to pulleys for steering chains are designed to
render such pulleys more suitable in use and less liable to become disarranged.
The improved pulley may turn on a boss or central pillar made in a piece
with or fixed to a castiron sole plate which is to be fixed to the deck or in some
other position; and I may make the eye of the pulley large enough to permit of
the insertion of a number of antifriction rollers between the inner bearing surface
of the eye and the outer bearing surface of the central pillar. In some cases
instead of the eye of the pulley turning on the outer surface of the central
pillar that pillar may be made hollow and of such a diameter that the part forming
CD 077

page_text: the boss or eye of the pulley will turn inside the pillar either with or without
the addition of antifriction rollers. A cover plate is fixed to the central pillar
and it may be made with a guard which extends beyond the rim of the pulley
and down to the sole plate. Antifriction bearings on the underside of the pulley
and suitable passages to permit of oiling the bearing surfaces may also be
provided.
And in order that my said invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings
to be hereinafter referred to and showing four simple modifications of my
improved pulley each in vertical section. In these drawings the same reference
letters are used to mark the same or like parts wherever they are repeated.
In the modification shown in Figure, 1, of the drawings the pulley, A, turns
on a boss or central pillar, B, made in a piece with a castiron sole plate, C,
which is to be fixed by bolts (not shown) to a deck, D, or in some other position ;
and I make the eye, E, of the pulley, A, large enough to permit of the insertion
of a number of antifriction rollers, F, between the inner bearing surface of the
eye, E, and the outer bearing surface of the central pillar, B. These surfaces are
provided with liners, G, of brass or other suitable metal. A cover plate, H,
fixed by a bolt, J, screwed into the central pillar, B, retains the pulley, A, and
rollers, F, in place and it may be formed with a guard, K, (shown by dotted lines)
which extends beyond the rim of the pulley, A, and down to the sole plate, C,
to which it is secured, thus preventing the "riding" or displacement of the
chain (not shown) or the rising of the pulley when in use. Ball bearings, L, are
applied between the sole plate, C, and the underside of the pulley, A, to reduce
friction; or annular bearing pieces may be used for this purpose if preferred. A
small hole, M, is formed through the cover plate, H, to permit of the introduction
of any suitable lubricant.
In the modification shown in Figure, 2, the antifriction rollers (F) are dis-
pensed with, the inner bearing surface of the eye, E, of the pulley, A, bearing
directly on the liner, G, on the outer surface of the central pillar, B.
In the modification shown in Figure, 3, of the drawings, the central pillar, B,
is made hollow so that the eye, E, of the pulley, A, works inside the pillar, anti-
friction rollers, F, being introduced between the outer bearing surface of the eye
and the inner bearing surface of the hollow central pillar, B. The rollers, F,
are introduced into position through an opening in the upper rim of the pulley, A,
which opening is afterwards closed by a screw plug, N. The bolt, J, for fixing
the cover, H, extends down to and is screwed into the sole plate, C.
Oil or
other suitable lubricant is introduced through a passage, P, (shown by dotted
lines) to the centre of the hollow pillar, B, and finds its way through passages, Q,
to the antifriction rollers, F, and ball bearings, L. The pulley, A, and sole
plate, C, are also fitted with annular bearing strips, R, near the outer edge of the
lower flange of the pulley, A, to further reduce friction.
The modification shown in Figure, 4, of the drawings resembles the modifica-
tion last herein before described with the difference that the anti-friction
rollers (F) are dispensed with, the outer bearing surface of the eye or boss, E,
of the pulley, A, bearing directly on the inner surface of the hollow central
pillar, B.
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. In pulleys for steering chains, the combination and arrangement of a
central pillar made in a piece with or fixed to a sole plate, a pulley on the central
pillar, antifriction rollers inserted between the eye of the pulley and the central
pillar, a cover plate fixed to the central pillar and made with or without a guard
which extends beyond the rim of the pulley, and antifriction bearings on the

page_text: underside of the pulley, substantially as and for the purposes hercinbefore described
and as shown in Figure, 1, of the accompanying drawings.
2. In pulleys for steering chains the combination and arrangement of a
central pillar made in a piece with or fixed to a sole plate, a pulley the inner
bearing surface of the eye or boss of which bears on the outer surface of the
pillar, and a cover plate fixed to the central pillar, substantially as and for the
purposes herein before described and as shown in Figure, 2, of the accompanying
drawings.
3. In pulleys for steering chains the combination and arrangement of a
hollow central pillar made in a piece with a sole plate, a pulley made with a
hollow boss or eye, antifriction rollers inserted between the outer bearing sur-
face of the eye or boss and the inner bearing surface of the hollow central pillar,
a fixed cover plate and antifriction bearings on the underside of the pulley sub-
stantially as and for the purposes herein before described and as shown in
Figure, 3, of the drawings.
4. In pulleys for steering chains the combination and arrangement of a
hollow central pillar made in a piece with a sole plate, a pulley made with a
hollow boss or eye the outer bearing surface of which bears on the inner bearing
surface of the hollow central pillar, a fixed cover plate and antifriction bearings
on the underside of the pulley, substantially as and for the purposes herein before
described, and as shown in Figure, 4, of the accompanying drawings.
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CT11000
EDMUND HUNT,
Applicant's Agent.