Year: 1887

page_text: Date of Application, 25th Apr., 1887.
Specification Accepted, 27th May, 1887.
We, ROBERT HEYWOOD of Crescent Bleach Works, Salford, in the County of
Lancaster, Bleacher, and DAVID Bridge of Adelphi Street Salford, in the County
of Lancaster, Foreman 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 frictional clutches for the purpose of transmitting power
from a shaft or prime mover, to a wheel or pulley, by which means machines, or
machinery may be propelled or driven.
or
The improvements which are the subject of this invention, consist in the construction
of an internal wheel or clutch, formed with a boss or centre, from which radiate spokes
arms; the spokes are connected to a rim of any suitable width, the external
diameter of which is a little less than the internal diameter of the wheel or pulley to
which power is intended to be transmitted. We cut or divide transversely the rim of
the internal wheel or clutch, so that each segment of rim is attached to the boss of said
internal wheel by only one spoke or arm, but without destroying the unity of
aforesaid internal wheel or clutch. By means of right and left hand screws attached
to and placed between said arms and rim, and actuated by suitable levers, the cuts or
divisions in the rim of internal wheel or clutch, are caused to open, and the diameter
of rim externally to become larger, and consequently to bind on the inside of external
pulley, thus causing the external pulley to rotate with equal speed.
In order more clearly to describe our invention, we have annexed hereunto a sheet
of drawings. In the several views illustrated therein, similar letters refer to similar
parts.
Fig. 1 is front view and Fig. 2 transverse section showing friction wheel or clutch,
and its relative position with a wheel or pulley to be driven. a is the shaft or prime
mover on which is keyed or otherwise secured the boss of the internal wheel or
clutch. c and c are arms radiating from boss b, and attached to rim d; the rim d is
cut or otherwise divided transversely at e, but retains unity in consequence of said
rim d being connected with the arms c and e' which are cast on, or firmly attached to

page_text: the boss b. On rim d we form sockets g and g¹. In sockets we place an adjustable
screw nut h, secured with a lock nut j. In screw nuts we insert one end of studs:
the opposite ends of studs we form with a screw thread to fit into screw nuts k
which are inserted in sockets g: by means of levers 7 and which are connected to
studs and to a grooved sliding piece m, the screwed ends of studs cause the rim d
to expand or contract as the sliding piece m is moved by means of a fork or other
suitable appliance, nearer to, or removed further from, the friction wheel or clutch: by
these means the rim d is expanded or increased in diameter when power is required to
be transmitted to the pulley so as to bind equally on the whole diameter of internal
surface of wheel or pulley n, and thus cause said pulley to rotate with equal speed.
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
For transmitting motion from a shaft or prime mover to a wheel or pulley for the
purpose of driving or propelling machinery, the use of a wheel or clutch formed for
attaching to said shaft by means of a boss or centre with arms radiating therefrom, to
which a rim is cast or otherwise firmly connected the said rim being cut or otherwise
divided transversely without destroying the unity of wheel or clutch, in order that by
pressure on the arms, the rim may be expanded so as to grip or bind on inner surface-
of wheel or pulley to be driven, substantially as hereinbefore described and illustrated.
THOS. PRESCOTT,
Agent for Applicants.