Improvements in Pulleys, Wheels, and the like.
Year: 1889

page_text: Date of Application, 30th July, 1889-Accepted, 31st Aug., 1889
COMPLETE SPECIFICATION.
Improvements in Pulleys, Wheels, and the like.
I MATTHEW COUCHMAN, of 2 Victoria Road, Great Marlow, Buckinghamshire,
Saw Mill Proprietor, 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 :-
This my invention has reference to certain new and useful improvements in pulleys
wheels etc. and which invention has for its object, to render the said pulleys
wheels etc. capable of being applied to shafting, or spindles of various diameters, in
cases where the said pulleys or wheels have not been previously specially bored
to fit the shafting or spindles to which they are to be attached.
This said invention is found to be especially valuable in cases where pulleys or
wheels are sent out or exported, and which may ultimately be applied to shafting
or spindles which have not been accurately turned to a standard guage.
I now proceed to describe my said invention, reference being had to the accom-
panying drawings and the letters and figures of reference marked thereon; like letters
referring to similar parts throughout.
Fig. 1. is a part front elevation of a pulley showing the application of my invention
theroto: Fig. 2. is a cross section of the aforenamed pulley taken on the line x, x, of
Fig. 1 Figs. 3, 4, 5 and 6, are detail views of my invention.
In the drawings, A refers to the pulley, and A¹ the boss thereof, which is in the
ordinary way bored out to a standard and suitable size represented by the line a.
In order to adapt the pulley to shafting of. any diameter, I insert in the bore of
the boss A¹, a combination of steel or other metal bushes B, which I provide of
various thicknesses, although in the drawings, I have shown five bushes of equal
thickness.
These said bushes may be produced in various ways, but for convenience when
manufacturing them in quantity I prefer to stamp them with dies of standard sizes.
In Figs. 1 and 2, I have shown one of various methods whereby the bushes (which
as shown are preferably made in halves) are prevented from turning within the bore
of the boss, and it consists of forming upon the outer surface of each bush a projec-
tion or feather which fits into a corresponding recess or slot 6' made in the inner
face of the bush next to it, and so on:-the projection or feather upon the largest
bush being adapted to fit a corresponding recess or slot formed in the bore of the
boss A¹ at c as shown. These said projections, or feathers, and recesses or slots may
either be just sufficiently long to answer the purpose for which they are intended, as
shown in Fig. 2, or they may extend the entire length of the bush, after the manner
shown in Figs. 3 and 4.
In Figs. 3, 4 and 5, I have shown the projections 6 and recesses 6 of a modified
form, for, as will be seen more particularly by reference to Fig. 5, the projections b
and corresponding recesses b' increase in size proportionately with the diameter and
thickness of the bush employed. This particular form of bush will be found strong
and more suitable for pulleys of large diameter, and worked under great strain.
In Fig. 6. I have shown an alternative form of bushes, which as will be
seen are slightly tapered on their outer and inner faces respectively, in such a
manner that when two of these said bushes are driven in tightly between the shaft
and the face of the bore, the pulley or wheel is thereby firmly clamped and secured
to the shaft the surfaces d, d' remaining always parallel. Inasmuch as the bushes
are made in halves and that a small space e is left between them, it will be readily
understood that the diameter of the face of the inner bush is increased or decreased
according to the distance the wedge-shaped bushes are drawn out or driven in.

page_text: There are other means whereby the bushes may be secured in place, such as a set-
screw C, (indicated by broken lines in Fig. 1.) and in some cases the friction between
the bushes will be sufficient but I have only shown and described such of the means
as will serve to illustrate the nature of my invention.
In the drawings I have only shown my invention as applied to a pulley of the
class known as split pulleys, but it will be readily understood that the said invention
is also applicable to other pulleys, wheels, and other parts of machinery which are
bored to fit shafts etc., such as excentrics, collars and the like.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
Bushes, consisting of pieces of metal of various thicknesses adapted for insertion
into the bore of pulleys, wheels and the like; the said bushes being made in two
halves, and provided with devices whereby they are prevented from turning within
the said bore, all substantially as and for the purposes herein before described, and
illustrated in the drawings hereunto annexed.
Dated this 30th day of Julv 1889
HORN & SON,
Applicant's Agents.