AN IMPROVED FRICTIONAL CLUTCH OR COUPLING WHICH MAY ALSO BE USED AS A BRAKE
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I WILLIAM JOHN FRASER of 121, Adelaide Road, Haverstock Hill, in tho
County of Middlesex Engineer, do hereby declare the nature of my said invention
for AN IMPROVED FRICTIONAL CLUTCH OR COUPLING WHICH MAY ALSO BE USED
AS A BRAKE to be as follows:-
My invention has reference to a frictional clutch or coupling for conveying
power from a prime mover or shaft to a wheel or machine to be driven, and is
adapted for either a forward or backward motion or for use as a brake.
And my invention consists in the use of a cylindrical case or box (to which may
be connected the wheel or machine to be driven) bored out to run freely on the
driving shaft and turned true on its internal periphery. On the inside of this caso
or box is fitted a loose cylindrical ring turned true on the outside surface to fit the
inside of the said case or box and then divided into halves or sections to admit of
contraction or expansion, so that it may be drawn inwards or pressed outwards
against the inside of the said case or box, by the following or an equivalent
expanding arrangement in order to produce the required frictional connection.
On the driving shaft which runs through the centre of the case or box is keyed
a boss with two or more projecting arms and pins actuating levers arranged to
produce a powerful expanding motion, and which levers are caused by tho
revolution of the driving shaft (in either direction) to press firmly in opposite
directions against the before mentioned loose cylindrical ring, thereby forcing it.
outwards against the interior of the cylindrical case or box and producing sufficient
frictional power to give a rotary motion to the case or box, which will thẹn run
at the same speed as the driving shaft.
The loose cylindrical internal ring is fitted with contracting springs so that
when the driving shaft is not in motion the outside cylindrical case or box is
at liberty to run freely round or remain stationary, and the levers inside are
at rest.
i
Any other expanding arrangement may be adapted which will press the internal
expanding ring outwards firmly against the interior of the cylinder in the manner
referred to..

page_text: I WILLIAM JOHN FRASER of 121 Adelaide Road Haverstock Hill in the
County of Middlesex Engineer do hereby declare the nature of my said Invention
for "AN IMPROVED FRICTIONAL CLUTCH OR COUPLING WHICH MAY ALSO BE USED
AS A BRAKE" and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statéinént :—
My Invention has reference to a frictional clutch or coupling for conveying
power from a prime mover or shaft to a wheel or machine to be driven, and is
adapted for either a forward or backward motion or for use as a brake.
And my Invention consists in the use of a cylindrical case or box (to which may
be connected the wheel or machine to be driven) bored out to run freely on the 1
driving shaft and turned true on its internal periphery. On the inside of this case
or box is fitted a loose cylindrical ring, turned true on the outside surface to fit the
inside of the said case or box and then divided into halves or sections to admit of
contraction or expansion, so that it may be drawn inwards or pressod outwards
against the inside of the said case or box by the following or an equivalent 1
expanding arrangement in order to produce the required frictional connection.
On the driving shaft which runs through the centre of the case or box is keyed
a boss with two or more projecting arms and pins actuating levers arranged to
produce a powerful expanding motion, and which levers are caused by the
revolution of the driving shaft (in either direction) to press firmly in opposite
directions against the before mentioned loose cylindrical ring, thereby forcing it
outwards against the interior of the cylindrical case or box, and producing sufficient
frictional power to give a rotary motion to the case or box, which will then run at
the same speed as the driving shaft.
The loose cylindrical internal ring is fitted with contracting springs, so that
when the driving shaft is. not in motion the outside cylindrical case or box is
at liberty to run freely round or remain stationary, and the levers inside are
at rest.
Any other expanding arrangement may be adapted which will press the internal
expanding ring outwards firmly against the interior of the cylinder in the manner
referred to.
In order that my Invention may be fully understood I will proceed to describe
it more particularly by reference to the accompanying drawings in which is
represented one mode of carrying it into effect.
DESCRIPTION OF THE DRAWINGS,
Fig 1 is an elevation of the clutch or coupling with the cover plate removed,
and Fig 2 is a vertical section on the line A B of Fig 1. In these two figures the
same letters of reference indicate corresponding parts.
A is the cylindrical case or box to which may be connected the wheel or machine
to be driven, B is the driving shaft, C is the loose cylindrical ring adapted to fit
the inside of the case or box and divided into sections to admit of annimation

page_text: expansion as required by the means represented and boroinafter described, or by
other suitable means. D is the boss keyed on the driving shaft B, such boss being
formed with projecting arms or lugs d d carrying pins Ĕ E actuating levers F F
which are capable of producing a powerful expanding motion on the revolution of
the driving shaft B in either direction, and are caused to press firmly in opposite
directions against the loose cylindrical ring C, which is thereby forced outwards
against the interior of the cylindrical casc or box A, in order to produce the
required frictional power to give rotary motion to the case or box A and effect its
connection with the driving shaft B in the manner required. GG are contracting
springs which are adapted to liberate the cylindrical caso or box A and bring the
levers F F to rest when the driving shaft B is not in motion.
Instead of the above described means of expanding the ring C, other means
might be employed, and instead of the ring, blocks might be used so as to be
forced outwards and effect the required frictional connection with the case or
box A.
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 what
I claim is
The construction of a frictional clutch or coupling in which the required con-
nection between the prime mover or driving shaft and the wheel or machine to be
driven is produced or effected by means of an internal ring in halves or sections
(or its equivalent) which is expanded by levers or other suitable micans so as to
press the exterior surface of the expanding ring firmly against the interior of the
case or box in the manner substantially as described.