Improvements in Friction Clutches or Power Transmitters.
Year: 1893

page_text: Date of Application, 4th Apr., 1893
Complete Specification Left, 3rd Jan., 1894-Accepted, 3rd Feb., 1894
PROVISIONAL SPECIFICATION.
Improvements in Friction 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:-
Cone friction clutches or power transmitters have before been made in which
the outer cone has consisted of a bar of spring metal wound into a conical coil.
When the conical coil so formed has been pressed on to a revolving solid cone and
there has been any resistance to its being carried round with this cone the friction
between the two cones has tended to wind up or increase the number of turns in
the flexible conical coil and so has caused it to contract and firmly grip the solid
cone.
In such apparatus as heretofore made the spring cone when out of gear has
hung loosely upon the moving cone causing considerable friction and heating
especially at high speeds.
According to this invention I remedy this defect by fixing the smaller or outer.
end of the spring cone to a boss which is preferably conical so that when the
spring is out of gear it is supported by the boss and no longer comes into contact
with the moving cone.
1 1000
W. H. LINDSAY.
COMPLETE SPECIFICATION.
Improvements in Friction 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 and in
what manner the same is to be performed to be particularly described and
ascertained in and by the following statement:-
Cone friction clutches or power transmitters have before been made in which
the outer cone has consisted of a bar of spring metal wound into a conical coil.
When the conical coil so formed has been pressed on to a revolving solid cone
and there has been any resistance to its being carried round with this cone the
friction between the two cones has tended to wind up or increase the number of
turns in the flexible conical coil and so has caused it to contract and firmly grip
the solid cone.
In such apparatus as heretofore made the spring cone when out of gear has
hung loosely upon the moving cone causing considerable friction and heating
especially at high speeds.
According to this invention I remedy this defect by forming the spring coil to
extend beyond the smaller end of the solid cone and by fixing its outer end to a
boss or sleeve which is preferably conical so that when the spring is out of gear
it is supported by the boss and no longer comes into contact with the moving
cone.
Figure 1 is a side elevation, Figure 2 a cross section and Figure 3 a longitudinal
section of a clutch constructed as above described. The clutch is shewn adapted
for coupling the end of one shaft to the end of another which is in a line
with it

page_text: A B are the two shafts-the one marked A has rigidly fixed to it a solid
cone C-the other marked B has a boss or sleeve D capable of being slidden
along it. E is a coiled spring surrounding the cone, it is as shewn continued
beyond the end of the cone and its outer or projecting end fits around the exterior
of the sleeve D and is fixed to it securely by bolts F.
Preferably I make the exterior of the sleeve tapering to form a continuation of
the cone C as shewn in Figures 1, 2 and 3 so that the interior of the coiled spring
may be bored to a uniform cone throughout but the exterior of the sleeve might
if desired be cylindrical and the interior of the end of the spring coil be bored to
fit to it as shewn in the longitudinal section Figure 4.
The sleeve may be formed with collars around it as shewn to allow of its
being moved endwise to and fro along the shaft B by suitable gear it is prevented
from turning around this shaft by a feather-G as shewn. H H are arms
extending from the sleeve D forming claws to hook over the free end of the
spring coil and prevent this coil from stretching lengthwise when being withdrawn -
from the solid cone.
By making the spring coil to extend beyond the end of the solid cone and by
rigidly securing the end of the coiled spring to a sleeve or collar mounted on the
shaft the coiled spring when drawn back so as to be free from the solid cone is
held altogether out of contact with the cone in place of resting loosely upon.
in the ordinary_construction. A similar construction of clutch can be adapted for
locking a wheel or pulley to a shaft upon which it is mounted loosely.
it as
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 :-
1. A friction clutch or power transmitter for coupling together two shafts in a
line with one another or a shaft with a wheel.or pulley mounted loosely upon it
in which the smaller end of a conical spring coil is rigidly secured to a sleeve
capable of being slidden along one shaft whilst the rigid cone which is embraced
by the larger end of the spring coil is secured to the other shaft or to the wheel
or pulley.
2. A. friction clutch or power transmitter for coupling together two shafts in. a
line with one another or a shaft with a wheel or pulley that is mounted loosely,
upon it in which the smaller end of a conical spring coil is made to embrace and
is rigidly secured to a sleeve capable of being slidden along one shaft whilst the
rigid cone which is embraced by the larger end of the spring coil is secured to
the other shaft or to the wheel or pulley.
3: A friction clutch or power transmitter constructed substantially as herein
before described and illustrated in the drawing annexed.
Dated this 1st do
2001