improvements in fulleys.
Year: 1890

page_text: improvements in fulleys.
A communication from abroad by THE REEVES PULLEY Co., of Columbus, Indiana,
United States of America.
I, WILLIAM PHILLIPS THOMPSON, F.C.S., M.L.M.E., of the Agency for Foreign
Patent Solicitors, 6, Lord Street, Liverpool, and 6, Bank Street, Manchester, both in
the County of Lancaster, and 323, High Holborn, in the County of Middlesex, Civil
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:-
The invention relates in part to an improvement in wooden split pulleys. The
object of the improvement is to provide, in this class of pulleys for each of the half
rims forming the pulley, a light and strong diametrical cross-bar, having its ends so
secured to the rim as to be practically inseparable therefrom, and presenting, at its
centro, a large bearing surface for grasping the shaft and presenting an opportunity
for strongly clamping the cross-bars of the two sections strongly together, all as
hereinafter fully described.
The accompanying drawings illustrate the invention.
Figure 1 represents a side elevation of the entire pulley.
Figure 2 represents a plan, at the line a Figure 1, of one half of the pulley.
The rim A is built up in two semi-circular sections of a series of annular wooden
segments, several thicknesses being secured one upon the other, to form the width of
face required, in the usual well known manner.
BBBBB is a series of thin flat cross-bars, having their ends built into the
rim A, and forming a part thereof in such a manner that the cross-bars connect the
two ends of the sections forming the half-rim, and are arranged side by side with
open spaces cc between them. The several cross-bars B are connected, midway
between their ends, by short blocks d d which, together with the edges of the cross-
bars, form a solid continuous surface, in which is cut a central semi-cylindrical
groove e, adapted to receive a shaft or bushing. The edges of the cross-bars B are
slightly hollowed, so that, when the two sections of the pulley are put together to form
a complete circle, the opposed edges of the two sets of cross-bars are slightly
separated at the centre.
The two sections forming the pulley are strongly clamped together by means of
a series of bolts ff, and 9 g, arranged in the spaces c between the several cross-bars,
and passing through washers hand i, arranged on the inner edges of the
cross-bars.
By this construction a light and strong compound cross-bar is formed, the
strength of which may be adapted to the work required in different pulleys, by
putting more or less of the bars B into the series. A long bearing surface on the
shaft, with lightness of material, is provided, and the boring of holes through the
cross-bars to receive the clamping bolts is avoided.
In operation, the shaft being of sufficient diameter to closely fill the central
opening formed by the grooves e of the opposed pair of compound cross-bars, or being
provided with the usual well known split bushing, if of smaller diameter, the two
sections forming the pulley, are secured together and to the shaft, first, by the
bolts passed through the spaces c between the bars B of both sections, near their
outer ends, thus drawing the ends of the rim sections closely together, and then by
bolts g passed through the spaces c near the middle of the bars, clamping the middle
of the bars (which, by reason of their edges being hollowed, yield slightly) strongly
upon the shaft.
A compound diametrical cross-bar as applied to a pulley formed in two separable

page_text: sections has been described, but, in some cases, it is not desirable to have the rim
separable, in which case the ends of the cross-bars are built into the rim in the same
manner, but the segments of which the rim is composed are arranged so as to break
joints over the meeting edges of the cross-bars, thus making a whole pulley which is
clamped to the shaft in the same manner by the central bolts g.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, as communicated to me by
my foreign correspondents, I declare that what I claim is :-
1. In a pulley, the combination of the rim built of segments, and the series of thin
flat bars extending from side to side of the rim, with open spaces between them,
parallel with the circumferential plane of the pulley, and having their ends secured in
the rim, and forming therefor a compound diametrical cross-bar, as set forth.
2. In a separable pulley, the combination of the rim, consisting of two substantially
equal diametrically separable suctions, each having a compound cross-bar consisting
of a series of thin fint bars, having their ends secured to the rim section, and arranged
side by side, with open spaces between them parallel with the circumferential plano
of the pulley, each of said compound cross-bars having a central semi-cylindrical
groove adapted to embrace a shaft, and a series of bolts arranged to pass through both
of the compound cross-bars, in the spaces between their soveral members, and adapted
to clamp the pulley sections together upon the shaft, as set forth.
Dated this 5th day of May 1800
WM. P. THOMPSON & Co.,
Agents for the Applicant.