Year: 1887

page_text: Date of Application, 14th July, 1887
Complete Left, 4th Oct., 1887
Complete Accepted, 4th Nov., 1887
We, THOMAS SCHOFIELD, Dyer, and FREDERIC BARKER, Engineer, both of
Cornbrook, Manchester in the County of Lancaster, do hereby declare the nature of
this invention to be as follows:-
The Invention consists of a number of Improved Friction segments arranged round
the inner circumference of the driving pulley or wheel, and the mechanism for
working same.
On a shaft A is placed a loose pulley B, which is allowed to revolve on the shaft as
long as the Friction Segments are not applied to its inner rim. The boss and arms
are placed to one side of the pulley, in order that the inner circumference of the rim
may be at liberty for the application of the friction segments which are constructed
and applied as shown in the accompanying drawings.
Fig. 1, The driving carrier C is keyed or screwed fast to the shaft A, the radial
arms of segments D are fixed to carrier C by means of a hinge pin D'.
The movable ends of segments D are linked to the screws E and these screws are
carried by bush nuts F which are fixed in bearings in the driving carrier C and have
on one end a short lever or crank F¹ the ends of which being jointed by means of a
link G to the sliding bush H.
It will thus be seen that the sliding bush H being moved to or from the pulley B
motion is imparted to the bush nuts F through their cranks F¹ and connecting
links G to the extent of about a quarter of a revolution, and the screws E connected
to movable ends of segments D and working in these bush nuts F force the segments
to, or withdraw them from contact with the pulley rim according to the direction in
which the sliding bush H is moved.
The sliding bush H the screws E and bush nuts F are not new, and are only
mentioned as a means for working the improved segments to which our improved
starting gear may not always be applicable. The drawing Fig. 2 shows our improved
starting gear, A being the shaft, B the pulley C the carrier, D the friction segments,

page_text: E the screws, E¹ the adjustable links and F the bush nuts. On the ends of F instead
of cranks F¹ we fix worm wheels F and drive by worms F3 fixed on a short shaft J
on the opposite end of which is a small friction pulley F which is driven by a loose
flanged bush K.
The method of working the gearing is as follows; When the shaft A is stationery
and the segments D not in contact with the rim of pulley, B, a sharp turn is given to
the bush K in the direction the driving pulley B revolves. Thus the flange of bush K
drives the friction pulleys F and thus through the Worms, and worm-wheels impart
motion to the screws and force the friction segments against the rim of pulley, B and
so drive the shaft A. When necessary to stop the driving, the attendants hand or a
brake can be applied to the rim on bush K, thus imparting an opposite motion to the
friction pulleys F and withdrawing by means of Worms, worm-wheels and screws
the friction segments from contact with pulley B. We can substitute Geared wheels
instead of Friction pulleys F if necessary.
Dated thi 19th J
T
1007

page_text: COMPLETE SPECIFICATION.
Improvements in Friction Clutches and Starting Gearing Applicable
in Connection therewith.
We, THOMAS SCHOFIELD, Dyer, and FREDERIC BARKER, Engineer, both of
Cornbrook, Manchester, in the county of Lancaster 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 Invention consists of a number of improved Friction segments or clips
arranged round the inner circumference of the driving pulley or wheel, and the
mechanism for working same.
On a shaft A, is placed a loose pulley B, which is allowed to revolve on the shaft as
long as the Friction segments are not applied to its inner rim. The boss and arms
are placed a little to one side of the pulley in order that a good portion of the inner
circumference of the rim may be at liberty for the application of the Friction segments
which are constructed and applied as shown in the accompanying drawings.
The driving Carrier C is keyed or screwed fast to the shaft A, the radial arms of
segments D are fixed to Carrier C by means of a hinge-pin D¹. The movable ends
of segments D are linked to the screws E, and these screws are carried by bush-
nuts which are fixed in bearings in the driving carrier C, and have on one end a
short lever or crank F¹ the ends of which being jointed by a link G to the sliding-
bush H. It will thus be seen that the sliding bush H being moved to or from the
pulley B motion is imparted to the bush-nuts F through their cranks F' and connecting-
links G, to the extent of about a quarter of a revolution; and the screws E connected
to movable ends of segments and working in these bush-nuts force the segments to or
withdraw them from contact with the pulley-rim, according to the direction in which
the sliding bush H is moved.
The sliding-bush H, the screws E, and bush-nuts F are not new, and are only
mentioned as a means of working the improved segments, to which our improved
starting gear may not always be applicable. The drawing Fig. 2 shows our improved
starting gear-A being the shaft B the pulley, C the carrier, D the friction segments,
E the screws, E the adjustable links and F the bush-nuts. On ends of F instead of
cranks F¹ we fix worm-wheels F and drive by worms F³ placed on short shafts; on
the opposite ends of which are small friction pulleys F which are driven by a loose
double-flanged bush K.
One method of working the gearing is as follows:-When the shaft is stationary,
and the segments not in contact with the rim of pulley, a sharp turn is given to the
bush K in the direction the driving pulley B revolves. Thus the outer flange K¹ of
the bush K drives the friction pulleys F and thus through the worms and worm-
wheels impart motion to the screws, and force the friction segments against the rim
of pulley B and so drive the shatt A. When necessary to stop the driving, the

page_text: attendant's hand or a brake can be applied to hand-wheel K³ on bush K; thus
imparting an opposite motion to friction pulleys F and with-drawing by means of
worms, worm wheels, and screws, the friction segments from contact with pulley B.
We can substitute geared wheels instead of friction pulleys if necessary. Another
method of working the starting gearing is as follows:-The loose bush K having two
flanges K and K a lever L is fixed so that either of the flanges may be brought in
contact with the friction pulleys F. When the inside flange K is in contact, the
hand-starting-wheel K must be turned in opposite direction to the revolution of
driving pulley, and as the pulley revolves the pressure of the friction-pulley against
the flange K causes the loose bush to revolve also and thus the friction necessary to
turn the hand-wheel always keeps the clips tight-up to rim, answering as a self-
tightening motion. When necessary to stop the driving the loose-bush K is moved
on shaft by means of lever L till the outer flange K¹ comes in contact with friction
pulleys F. The attendant's hand or a light brake is applied to the hand-wheel K³
and the friction pulleys F immediately revolve in the direction necessary to withdraw
the segments from rim of pulley.
The friction pulleys F may be either square as in drawing, or conical.
:-
Having now particularly described and ascertained the nature of our said Invention,
and in what manner the same is to be performed we declare that what we claim is :-
1. The improved hinged expanding friction segments or clips.
2. The improved starting gearing applicable in connection therewith, and the
mechanism for effecting the same, substantially as and for the purpose herein shown
and described.