Improved Device or Means for Attaching Wheels, Pulleys, Cams, Bars, or other Devices to Shafts.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improved Device or Means for Attaching Wheels, Pulleys, Cams,
Bars, or other Devices to Shafts.
I, SIDNEY HOWARD FARRAR of 54 Old Broad Street in the City of London,
Engineer do hereby declare the nature of this invention to be as follows:-
This invention relates to the automatic clamping of wheels, pulleys, cams,
bars, or similar devices to shafts, and consists in improved apparatus for that
purpose.
Through the boss of a pulley, wheel, cam or bar, which it may be desired to
firmly secure or clamp to a round shaft, I bore a hole, of which one part is
concentric to the boss of the wheel, pulley, cam or bar, and an approximate fit to
the shaft, and the other part is slightly eccentric to the shaft or first mentione
concentric bore, and of larger diameter.
Within this eccentric bore place an eccentric bush or sleeve split or dividel
into sections in any convenient manner.
The said eccentric bush is prevented from revolving around the shaft by a ball,
sunk partly into the under face of the eccentric bush, and partly into a corre-
sponding recess in the shaft; or 1 may employ a pin in the shaft engaging into a
recess in the bush or between the ends of its sections; or I may cause the inner
face of the bush to engage with the surface of the shaft such as by means of
serrations, or in other convenient manner.
The pulley wheel, cam, or bar, being placed upon a shaft with the eccentric bush
in its position in the eccentric bore, on turning the pulley, wheel, cam, or bar, in
either direction, the eccentric and concentric bores will jam upon the bush and
shaft relatively, and the pulley, wheel, cam, or bar will be firmly fixed in position
for driving, so long as the driving resistance tends to jam the pulley, wheel, cam,
or bar, further home. By knocking back the pulley, wheel, cam, or bar, into the
original position in which it was placed on the shaft, it will be again loose, and may
be shifted on the shaft as desired.
By this arrangement the wheel, pulley, cam, or bar, will jam if turned either
way on opposite sides of the normal position of freedom.
Dated this 02nd day of December 1895.
FELL & WILDING,
1 Queen Victoria Street, London, E.C., Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Device or Means for Attaching Wheels, Pulleys, Cams,
Bars, or other Devices to Shafts.
I, SIDNEY HOWARD FARRAR, of 54 Oid Broad Street, in the City of London
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 :-
This invention relates to the automatic clamping of wheels, pulleys, cams, bars,
or other devices to shafts, and consists in improved apparatus for that purpose;
and in order that the invention may be the better understood it will now be
described in relation to the accompanying drawings hereunto annexed, reference

page_text: being had to the letters and ngures marked thereon. Like letters refer to like
parts in the various figures.
Figure 1 is an end elevation of a cam upon a shaft with the attaching device in
place.
Figure 2 is a front sectional elevation of the cam and fastening device, the shaft
being shown in full.
Figure 3 is an end elevation of a boss of a wheel or pulley upon a shaft, with a
modified fastening device.
Figure 4 is a similar view to Figure 3 with a further modified fastening device.
To carry the invention into effect, the boss A of the pulley, wheel, cam, or bar,
which it may be desired to firmly secure or clamp to a round shaft B, is bored with
a hole, of which one part a is concentric to the boss A of the pulley, wheel, cam,
or bar, and an approximate fit to the shaft B; and the other part a is slightly
eccentric to the shaft B or to the aforesaid concentric bore a, and is of larger
diameter.
Within this eccentric bore a' is placed an eccentric bush or sleeve C, split, or
divided into sections in any convenient manner.
The said eccentric bush C is prevented from revolving around the shaft B by a
ball D, sunk partly into the under face of the eccentric bush C, and partly into
a corresponding recess in the shaft B, as shown in Figures 1 and 2; or a pin D¹
may be employed engaging the shaft B and bush C, as shown in Figure 3; or,
equivalently, the pin D may be inserted into the surface of the shaft B and
adapted to engage the bush C between the ends of its sections; or the inner face
of the bush C may be caused to engage with the surface of the shaft B by
serrations E, as shown in Figure 4, or by emery cloth, or in other convenient
manner.
The pulley, wheel, cam, or bar, being placed upon the shaft B, it is slid along
over the eccentric bush C which has previously been placed in position on the
shaft. B, so as to engage the bush C in the eccentric bore a¹. When, now, the
pulley, wheel, cam, or bar, is turned in either direction, the eccentric and concentric
bores will jam upon the bush and shaft relatively, and the pulley, wheel, cam, or
bar will be firmly fixed in position for driving, so long as the driving resistance
tends to jam the, pulley, wheel, cam or bar further home. By knocking back the
pulley, wheel cam or bar into the original position, in which it was placed on the
shaft, it will be again loose, and may be shifted on the shaft as desired.
By this arrangement the wheel, pulley, cam or bar will jam if turned either way
on opposite sides of the normal position of freedom.
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 :-
1st. A wheel, pulley, cam, or bar, or other similar device, having a boss with
one portion of the bore concentric to the boss of pulley, and adapted to fit a round
shaft, and another portion of the bore of an enlarged diameter and eccentric to the
before said concentric portion; in combination with a bush in one or more
sections, with a bore adapted to fit the shaft, 'and with its exterior eccentric to
the bore, and adapted to engage in the eccentric bore of the pulley, wheel, cam,
bar or other device and means for preventing the movement of the bush on the
shaft, substantially as described.
2nd. The arrangement and construction of devices for fastening pulleys, wheels,
cams, or other devices upon round shafts, substantially as described and illustrated
in and by the accompanying drawings.
n
D
FELL & WILDING,
1 Queen Victoria Street, London, E.C., Agents for the Applicant.