An Improvement in Pulleys and Wheels.
Year: 1891

page_text: COMPLETE SPECIFICATION.
An Improvement in Pulleys and Wheels.
I, WILLIAM POTTER, of Marblehead, Massachusetts, U.S.A., Inventor, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:—
This invention has for its object to improve the construction of that class of
pulleys adapted to be applied to shafting without the necessity of cutting it or
taking it down, such pulleys being commonly called "divided" pulleys.
In accordance with this invention the line of severance of the small part or
section which is removed from the rim to admit the shaft is such that the section
may be secured in position by screws or other suitable fastenings without breaking
or interrupting the continuity or smooth surface of the rim externally or internally;
also the part or segment removed from the hub to admit the shaft is independent
of the other parts of the pulley—that is, independent of the spokes-and the
means employed for fastening the said part or segment in position are such as to
leave no projection to break the continuity or smooth surface of the hub.
Figure 1 shows in side elevation a pulley embodying this invention;
Fig. 2, a front view of the pulley, shown in Fig. 1;
Fig. 3 a side elevation of the pulley, parts of the rim and hub being removed;
Fig. 4, a section of the pulley shown in Fig. 1, taken on the dotted linea; and
Fig. 5, a detail to be referred to.
The rim of the pulley has a small part or portion 6 removable or detachable,
the line of severance at each end being diagonal for a part of the whole distance,
as represented at 2, Figs. 1 and 3. Such diagonal lines permit the part 6 to be
secured in position by means of screws 3, so that the continuity of the rim is
unbroken externally and internally. The part or segment e, which is removed from
the hub, is independent of any other part of the pulley.
Bolts 4 (see dotted line, Figs. 1 and 3) pass through the hub and the part or
segment c, holding it in position, the part or segment c having countersinks to
receive the heads of the bolts.
In order to provide suitable recesses for the nuts which are turned on the bolt
and to insure sufficient space in which to turn the nuts, I have cut or slabbed off the
hub at one side directly opposite the part or segment c so that when the part or
segment d is removed a flat face is provided which permits the nuts 5 to be turned
easily.
The part or segment d (see Fig. 5) has quadrangular recesses or notches at its
ends to receive the nuts, so that a smooth-surfaced hub may be represented, or one
devoid of any projections, while the shape of the recesses prevents the nuts from
turning.
The part d is secured to the hub by a screw or other suitable fastening.
The spokes e of the pulley are formed at each side of the hub, as represented,
connecting the hub and rim, and spokes e¹ connect the said spokes e and rim so that
the parts b and c may be readily removed, when desired, and the strength of the
pulley is not dependent in any way on the removable parts. The shaft-receiving
hole is bored with the part or segment c in place, to thereby form a truly circular
hole for a tight fit on the shaft, and when it is intended that the pulley should be
used as a loose pulley the part or segment c is placed in position, but slightly
separated from the other part, so that a larger hole may be bored.
The invention as above described and as shown is as well applicable to wheels
of various kinds, more particularly heavy wheels, as fly-wheels, and the like, so I
do not desire to limit myself to the particular use to which it is put.

page_text: Having now particularly described and ascertained the nature of this my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. A pulley or wheel having a part or section of the rim removable, the line of
severance being diagonal for a part of the whole distance, as 2, combined with
fastenings for the said removable part or section extended through such diagonal
portion, substantially as described.
2. A pulley or wheel having a part or segment e of the hub removable, com-
bined with a part, as d, removable from the opposite side of the hub, and bolts
for securing the parts together, said part d having quadrangular notches for the
nuts of the bolts, the notches preventing the said nuts from turning, substantially
as described.
Dated this oth d
100