Year: 1887

page_text: Date of Application, 27th Jan.. 1887
Complete Left, 24th Oct., 1887
Complete Accepted, 29th Nov.. 1887
HI, ARTHUR COLLINGS WELLS, of Ogden Street, Manchester, in the County of
Lancaster, Engineer do hereby declare the nature of the said invention, to be as
follows:
My invention relates to means by which the bosses of split drums or pulleys can be
arranged to be readily adapted to suit and be secured upon shafts of various diameters
and consists 'in the combination with the bosses of split pulleys or drums of separate
bushes, made in halves.
The 'boss of 'the split pulley or drum is bored out to a large diameter, the midde
part of the boss between the two ends being recessed or enlarged.-The bush is made
in two halves, with an enlarged diameter by preference in the middle of the lengthway
of the bush to enter the said recess or enlarged bore formed in the bore of the split boss.
The two exterior ends of the bush are turned to accurately fit the bore of the split
boss. The bush is or may be bored out to suit any desired diameter of shaft within
certain limits. These split bushes are thus prepared all of the same external diameter
and are kept in stock bored out for the sizes of shafts which they are to fit so that by
changing the bush the pulley or drum can be used for various diameters of shafts.
'The split bush is secured in the boss by the middle projection, and recess in the
split boss and also by two set screws screwing through tapped holes on the split boss
and passing through holes in one split bush, the ends of the set screws coming against
the shaft.
In some cases one half bush may be dispensed with.

page_text: COMPLETE SPECIFICATION.
Improvements in Split Drums or Pulleys for Driving Machinery.
I ARTHUR COLLINGS WELLS of Ogden Street Manchester, in the County of
Lancaster, 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 :-
My invention relates to means by which the bosses of split drums or pulleys can be
arranged to be readily adapted to suit and be secured upon shafts of various diameters,
and consists in the combination with the bosses of split pulleys or drums of separate
bushes made in halves.
The boss of the split pulley or drum is bored out to a large diameter, the middle
part of the boss between the two ends being recessed or enlarged. The bush is made
in two halves with an enlarged diameter by preference in the middle of the lengthway
of the bush to enter the said recess or enlarged bore formed in the bore of the split
boss.
The two exterior ends of the bush are turned to accurately fit the bore of the split
boss.
The bush is or may be bored out to suit any desired diameter of shaft within certain
limits.
These split bushes are thus prepared all of the same external diameter and are kept
in stock bored out for the sizes of shafts which they are to fit, so that by changing the
bush the pulley or drum can be used for various diameters of shafts.
The split bush is secured in the boss by the middle projection and recess in the split.
boss, and also by two set screws screwing through tapped holes on the split boss and
passing through holes in one split bush, the ends of the set screws coming against the
shaft. In some cases one half bush may be dispensed with.
Fig. 1 is a side elevation of the boss of a pulley showing parts of the arms which
branch therefrom to carry the rim of the pulley.
Fig. 2 is a section through the boss on the line A-B fig. 1.
a the boss, a parts of the arms from it.
The boss (a) is formed in two halves bolted together by bolts a²-The interior of
the boss (a) is enlarged as shown in fig. 2, and the two sides are bored out to fit the
turned exterior of the bush which is made in two halves b and b¹ and of the form
shown.
The same boss a, is used for pulleys which are to be applied to shafts of various
diameters and the boss (a) is bored out the same size, but the interiors of the bushes
are bored out to suit various diameters of shafts, so that the same pulley may be used
for any size of shaft within certain limits (as arranged) by merely changing the bush
or boring out a bush of small interior diameter to fit a shaft of larger diameter.
When the pulley is placed upon the shaft, the two halves of the boss a are screwed

page_text: together by the bolts a² until they grip the two halves and b¹ of the bush and cause
it to grip the shaft.
One or more set screws 6 (two are shown in fig. 2) are made to screw through the
boss a as shown, and the points of these set screws pass clear of the bush b¹ to the shaft
and this gives further grip upon the shaft and prevents the bush from rotating in the
boss a.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, 1 declare that what
I claim is,
The combination with pulley bosses formed in two halves of an interchangeable
bush with or without set screws, as and for the purpose hereinbefore described and
illustrated by the drawings.