An Improved Friction Cluten.
Year: 1897

page_text: Date of Application, 18th Oct., 1897
Complete Specification Left, 13th July, 1898-Accepted, 13th Aug.,
1898
An Improved Friction Cluten.
I, WILLIAM HENRY CRANSTONE, of 25, High Street, Hemel Hempsted, in the
County of Hertford, Engineer, do hereby declare the nature of my said invention
to be as follows:-
My invention relates to an improved form and arrangement of friction clutch
for pulleys, coupling shafts, and analogous applications, for which Letters Patent
were granted to myself and William Robert Hay, dated 15th May 1894, No. 9520;
and the object of my present invention is to effect an improvement in the method
of and means and appliances for expanding and releasing the split ring therein
described.
According to my present invention, I vary the form of the segmental levers 17
described in the aforesaid specification and dispense with the forked levers 14, and
add a conical extension to the sliding sleeve. This conical surface is caused to
act upon the lower ends of adjustable screw bolts fitted to the outer ends of the
lever arms 17, the split ring being expanded by the forward motion of the sleeve,
and contracted by the reverse movement. Two links are pivoted to the sleeve
and the lever arms respectively to secure the latter in position for being actuated
by the conical portion of the sleeve.
An Improved Friction Clutch,
I, WILLIAM HENRY CRANSTONE, of 25, High Street, Hemel Hempstead, in the
County of Hortford, Engineer, do hereby declare the nature of my said invention
and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
-
My invention relates to an improved form and arrangement of friction clutch
for pulleys, coupling shafts, and analogous applications, for which Letters Patent
were granted to myself and William Robert Hay dated 15th May 1894 No. 9520;
and the object of my present invention is to effect an improvement in the method
of and means and appliances for expanding and releasing the split ring therein
described.
And in order that my said invention may be particularly described and ascer-

page_text: tained reference is hereby made to the accompanying drawings in which similar
letters of reference indicate corresponding parts.
Fig. 1 is a face view, and Fig. 2 a side elevation of a friction clutch constructed
according to my invention; and Fig. 3 illustrates a modification thereof.
Referring to Figs. 1 and 2, a is a cylinder loose on the shaft &. is the split
friction ring, formed in halves, the meeting ends being at d d. Near the meeting
ends the substance of the friction ring is reduced in order to enable the entire
peripheral surface of the ring to obtain frictional contact with the cylinder. The
meeting ends are formed to receive the expanding blocks eo, the blocks being
formed with semi-cylindrical ends or elliptically and the meeting ends of the
ring being formed to correspond therewith. The blocks e o are integral with the
segmental levers ff, acting as pivots to the levers, g is the sliding sleeve, which
revolves with the shaft by means of the spline or feather h. The sleeve is coned
at as shown in Fig. 2. mare adjusting screws fitted (with lock nuts) to the
free ends of the levers' f and carrying forks and (sometimes also) rollers,
the rollers being in contact with the sliding sleeve g..
m
f
sleeve.
The motions of the segmental levers are parallel with the face of the clutch,
the rollers nn being always in contact with the
In the position shown in Figs. 1 and 2 the split ring is fully expanded and the
cylinder a is driven with the shaft. On withdrawing the sleeve g from the faco
of the clutch the levers f f recede towards the centre and cause the split ring to
leave contact with the clutch cylinder
modification shown in Fig. 3 the sleeve
surface g, the segmental levers ff being fitted with suitable adjustable screws m
for actuating the levers in an analogous manner to that above described. This
arrangement is more particularly applicable to quick speed shafts whereby any
disadvantageous action resulting from centrifugal force is counteracted.
which is thereby released. In the
is formed with an internal conical
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. In friction clutches of the description aforesaid the improved method of
causing the split ring e to expand by means of segmental levers f one end of each
lever being integral with the expanding block e and the other end linked to a
roller in contact with the external conical surface of the sleeve g, substantially
as and for the purposes described and illustrated by Figs. 1 and 2 of the drawings.
2. In friction clutches of the description aforesaid, the application and use of
the modified form of sleeve y having an internally coned surface segmental
levers fitted with adjustable screws with or without the addition of rollers
attached thereto, substantially as and for the purposes herein before described and
illustrated by Fig. 3 of the drawings.
3. In friction clutches of the description aforesaid, the application and use of
expanding rings split across the expanding recesses for the blocks co; such split
rings being also reduced in substance near the split ends, thereby rendering the
whole peripheral surface of the ring available for obtaining frictional contact with
the cylinder a, substantially as herein before described and illustrated by the
drawings.