Improvements in Clutches or Power Transmitters.
Year: 1893

page_text: Date of Application, 10th Feb., 1893
Complete Specification Left, 9th Nov., 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Clutches or Power Transmitters.
I, WILLIAM HENRY LINDSAY, of The Shaw Engineering Works, Ashton
Gate, Bristol, Manager, do hereby declare the nature of this invention to be as
follows:-
In order to be able to couple either a driving or a driven pulley to the shaft that
carries it I mount upon the shaft a sleeve which can be slidden end wise along the
shaft but not turned around it whilst the wheel can turn freely around the shaft
but not moved endwise. To the sleeve I secure a coned or dished disc of spring
metal which is of such a diameter as just to fit loosely within the rim of the wheel.
The concave side of the disc is placed towards the pulley and the disc is slit
radially to allow of its being somewhat flattened out and thereby expanded. A
lever is also provided for moving the sleeve along the shaft.
When the sleeve is moved by the lever towards the pulley the outer edge of the
disc comes against the spokes and is thereby stopped. All further movement of
the sleeve then tends to flatten the disc and cause its circumference to bear against
the inner circumference of the rim of the wheel. Immediately that this takes
place the wheel is securely locked to the sleeve and consequently to the shaft.
Where considerable holding power is required the disc may be flanged around
its outer edge and the flange be made to bear against the interior of the wheel-the
flange may have slits formed in it to allow it to spring and adapt itself to the
wheel-the flange also may be coned and be made to fit to a corresponding cone
on the wheel.
Dated this 7th day of February 1893
W. H. LINDSAY.
COMPLETE SPECIFICATION.
Improvements in Clutches or Power Transmitters.
I, WILLIAM HENRY LINDSAY, of The Shaw Engineering Werks, Ashton
Gate, Bristol, Manager, 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:-
In order to be able to couple either a driving or a driven pulley to a shaft I
mount upon the shaft a sleeve which can be slidden endwise along but not turned
around it whilst the wheel can turn freely around the shaft but not move end wise.
To the sleeve I secure a coned or dished disc of spring metal which is of such a
diameter as just to fit loosely within the rim of the wheel. The concave side of
the disc is placed towards the pulley and the disc is slit radially to allow of its
being somewhat flattened out and thereby expanded. A lever is also provided for
moving the sleeve along the shaft.
When the sleeve is moved by the lever towards the pulley the outer edge of the
disc comes against the spokes and is thereby stopped. All further movement of
the sleeve then tends to flatten the disc and cause its circumference to bear against
the inner circumference of the rim of the wheel. Immediately that this takes
place the wheel is securely locked to the sleeve and consequently to the shaft.
Where considerable holding power is required the disc may be flanged around its
outer edge and the flarge be made to bear against the interior of the wheel-the
flange may have slits formed in it to allow it to spring and adapt itself to the
[Price 8dl

page_text: the wheel.
mange also may be coned and be made to it to a corresponung come on
Figure 1 is a section partly in eleration of the clutch.
Figures 2 and 3 are elevations of the disc and connecting gear respectively.
Figures 4 to 7 shew a modification Figure 4 being a section partly in elevation
of the clutch and
Figures 5 and 6 elevations of the disc and connecting gear respectively.
Figure 7 shews a detail.
In these figures a is the shaft and the pulley, whose boss b¹ is free to turn on
the shaft but cannot move endwise
upon it. c is a sleeve free to move endwise on
the shaft but caused to rotate with it by the feather c. d is the disc connected by
bolts d' to the sleeve c.
The steel disc in Figures 1 and 2 is shown split in three places but it may be
split in any number of places or to gain the end desired the pliability of the metal
used may be relied on without splitting the disc-the rim of the disc may also be
curled over to form a rounded friction surface or bent in any way. The disc may
be made round in the first place or formed so that when expanded it should be
perfectly circular. Gaps may be cut out of the circumference of the disc and
friction pieces of any material may be affixed at the circumference.
Any suitable mechanism may be used for shifting the sleeve c endwise of
the shaft.
In the arrangement shewn in Figures 1 to 3 e is a screw whose head e¹ enters a
groove formed around the sleeve c-the screw is prevented from turning by reason
of its head having a curved notch in it fitting the curve of the bottom of the groove.
The screw has upon it a nut flying between side bars g¹ upon a sleeve of which
loosely surrounds the shaft a and is prevented from turning by being fixed to one
end of a rod whose other end is fixed to the floor, wall or other place. The nut f
has teeth on its outside gearing with a segmental rack; hanging loosely upon it.
The ends of the rack are coupled by a light bar j¹ which at its centre rests against
and can turn around the end of an arm g² which projects downwards from the
sleeve g. Upon the exterior of the segmental rack there is a sliding weight k
which can be pulled from the bottom to the top of the rack by the cord 1.
When
this is done the weight causes the top of the rack to descend and in so doing it
revolves the nut and so causes the sleeve c and disc d to approach or recede from
the pulley b. If desired the weight might be fixed to the centre of the rack j
instead of sliding upon it.
In Figures 4 to 7 the sleeve c is moved by a pair of connecting rods m having at
one end friction pieces m³ lying in the groove of the sleeve and connected by a
wire m² as shown in Figures 4 and 7. The other ends of the rods m are pivotted
to the upper ends of the levers n pivotted at n¹ to the sleeve g upon the shaft.
This sleeve is prevented from turning by being fixed to one end of the rod whose
other end is fixed to the floor, wall or other place. The lower ends of the levers n
are connected together by the rod n² to which the cord o is fixed. The cord o is
pulled in one direction by the weight p and in the other by the handle or pull g
which is secured in its lower position by the spring catch g¹ (Figure 4).
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 :-
:-
1. A clutch or power transmitter consisting of a pulley, disc or wheel capable of
revolving freely around a shaft-a sleeve capable of being moved endwise along the
shaft-a coned or dished disc fixed to the sleeve-a recess on one side of the pulley
for the outer edge of the disc to enter and nearly fit and mechanism for shifting the
sleeve to and fro end wise along the shaft whilst the shaft is revolving so as either
to move the disc away from the pulley or press the edge of the disc against the
bottom of the recess and thereby flatten and expand it and cause its edge to bind
against the inner circumference of the recess substantially as described.

page_text: 2. The construction of clutch or power transmitters substantially as herein before
described and illustrated at Figure 1.
3. The construction of clutch or power transmitters substantially as herein before
described and illustrated at Figure 4.
If AT
1000
W. H. LINDSAY: