Improvement in Split Pulleys or Wheels.
Year: 1891

page_text: Date of Application, 13th July, 1891
Complete Specification Left, 7th Mar., 1892-Accepted, 21st May,
1892
PROVISIONAL SPECIFICATION.
Improvement in Split Pulleys or Wheels.
I, JOSEPH J. SOHOLFIELD, of No. 81 Westminster Street, in Providence,
Rhode Island, United States of America, Mechanician, do hereby declare the
nature of this invention to be as follows:-
My invention relates to the improved construction of a split-pulley, gear, or.cam-
wheel, whereby the wheel may be readily secured upon a continuously running
shaft, thus obviating the necessity for stopping the factory, to place a pulley or
other wheel in running position'; or whereby the wheel may be readily secured to a
shaft, in a machine, without necessitating the removal of the shaft from its bearings;
and it consists in a split-wheel having opposite removable parts secured to each
other in any suitable manner, and provided with an internal screw-thread, and with
a split-bushing, made either straight or tapering, and having a screw-thread upon
its exterior, adapted to fit the internal screw-thread of the said opposite parts of the
wheel; and it also consists in a split-wheel having an outor split-bushing provided
with an internal sorew-thread, and an inner split-bushing, provided with a screw-
thread adapted to fit the screw-thread of the outer bushing, the said screw-threads
serving to hold the parts of the wheel together upon the shaft.
Dated this 30th der of June 1801
JOSEPH J. SCHOLFIELD.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvement in Split Pulleys or Wheels.
I, JOSEPH J. SOHOLFIELD, of 81 Westminster Street, Providence, Rhode
Island, United States of America, Manufacturer of Machinery, 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 nature of my invention consists in the improved construction of the split-
pulley or wheel, whereby the wheel may be readily secured upon a continuously
running shaft, thus obviating the necessity for stopping the factory as usual to place
a pulley or other wheel in position. upon the shaft, or whereby the wheel be
may
readily secured to a shaft in a machine, without necessitating the removal of the
shaft from its bearings.
Fig. 1, represents a side elevation of a split-pulley embodying, my improvement.
Fig. 2; represents an axial' section of the same taken in the line 2, 2; of Fig. 1.
Fig. 3, represents a partial section taken in the line 3, 3, of Fig. 1.
Figs. 4 and 5, represent' perspective views of portions of the pulloy shown in
Fig. 1.
'
Fig. 6, representa aiside view of a gear-wheel embodying my improvement.
Fio 7 renresents a vertical section of the same..taken in the line 7, 7, of Fig. 6,

page_text: showing a modification in the construction of the inner split-bushing, and the
combination therewith of an outer split-bushing.
Fig. 8, represents an inside view of one of the parts of the outer split-bushing,
shown in Fig. 7.
In the accompanying drawings A, Figs. 1, 2 and 3, represents one semi-circular
section or segment of a split-pulley, and A', the opposite segment, each segment
being provided with the opposite lips b, b, as shown in Fig. 4, by means of which
the two segments may be connected together, the lips b, b, of one segment being
provided with the studs c, c, which. enter corresponding perforations c¹, c', made in
the lips b, b, of the opposite segment.
The semi-hubs d, d, of the segments A, A, are provided with an internal screw-
thread e, which is adapted to fit the tapered external screw thread f of the parts g, g,
of the split-bushing B, which embraces the shaft.
Whenever it is desired to attach the pulley to a running shaft, the parts 9, 9, of
the split screw-threaded bushing B, are placed in proper position at opposite sides
of the shaft, and the two segments A, A, of the pulley connected to each other,
over the shaft, by properly interlocking the lips b, b, so that the studs c, c, of one
side will enter the holes c', c', of the opposite side, the united segments A, A, are
then to be screwed onto the split bushing B, until the parts g, g. of the same,
are made to bind upon the shaft, thus holding the pulley tightly in place
and when the belt is placed upon the pulley, the greater the strain upon the
belt, the greater will be the pressure of the parts g, g, against the sides of
the shaft to prevent the pulley from slipping upon the same; the pulley being so
arranged, that the strain upon the periphery of the same, will serve to screw the
segments A, A, the tighter upon the tapering split-bushing B, and the screw threads
of the split-bushing B. will serve to prevent the lateral unlocking movement of the
segments A, A, thus rendering the employment of screw-bolts for that purpose
unnecessary.
The application of an outer split bushing B', is shown in Figs. 6 and 7, in which
the segments A, A', of a gear-wheel, are made without the semi-hubs d, d, the outer
split bushing B', taking the place of the said hubs; and in this case,, the parts g', g',
are each provided with an outer groovej, which fits a corresponding recess, made
in the web k, of the segments A, A', one of the parts g', being made to fit into the
recess of the segment A, and the other into the recess of the segment A', and the
outer and inner split-bushings B', B', may be provided with tapering sorew-threads
as shown in the pulley Fig. 2, or the split-bushing B instead of being provided with
a tapering screw-thread, adapted to fit a correspondingly tapered interior thread of
the outer bushing may be made in tapering form to fit the tapering bore of the
enclosing sections of the outer-bushing, a screw-thread being provided upon the
end of the parts g, g, of the inner split-bushing, to fit the internal screw-thread e¹, of
the said sections of the outer split-bushing so that upon screwing the parts together
the sliding contact of a conical or longitudinally tapering surfaces i, 1, will cause the
parts g, g, to press tightly upon the shaft D.
It is however to be understood that when it is not required to grip the shaft D
tightly, the sides of the parts g, g, of the bushing B may be made straight instead
of tapering.
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 I am
aware of the Specification of Letters Patent No. 3290 of 1885 granted to George
Smith, Edwin Smith, and Nathaniel Smith the younger, and I wish it to be
understood that I do not claim anything described and claimed therein, but what I
claim is:
1. The combination with the wheel-segments interlocked with each other and
provided with an interior screw-thread, of a split-bushing provided with an exterior
screw-thread, which will serve to secure the said segments against a lateral unlocking
movement substantially as decoribed

page_text: 2. The combination with the wheel-segments suitably secured to each other, of
an outer split-bushing provided with an interior screw-thread, and an inner split-
bushing adapted to fit the screw-thread of the outer split-bushing, and to secure the
Baid segments and outer bushing, to the shaft, substantially as described.
3. The combination with the wheel-segments suitably secured to each other, of
the outer split-bushing provided with an outer groove adapted to receive the web or
inner portion of the wheel-segments, and with an interior screw-thread, and the
inner split-bushing provided with an external screw-thread, adapted to fit the internal
screw-thread of the outer bushing, substantially as described.
Dated this Twenty-third day of February 1892.
JOSEPH J. SCHOLFIELD.
Haseltine, Lake & Co.,
45, Southampton Buildings, London, Agents for the Applicant.