Improvements in Friction Clutches.
Year: 1894

page_text: Date of Application, 25th June, 1894
Complete Specification Left, 25th Mar., 1895-Accepted, 27th Apr., 1895
PROVISIONAL SPECIFICATION,
Improvements in Friction Clutches.
We, WILLIAM HENRY CRANSTONE, of 25 High Street, Hemel Hempstead, in
the County of Hertford, Engineer, and WILLIAM ROBERT HAY, of 13 Christ-
church Road, Hemel Hempstead aforesaid, Engineer, do hereby declare the nature
of our said invention to be as follows:-
The object of our invention is to manufacture and fit improved friction clutches
to pulleys, coupling shafts, and analogous appliances,
In applying our invention to an ordinary coupling for shafts, pulleys, and the
like, we use a drum or cylinder, running loosely on the shaft, one end of the
cylinder being uncovered. Upon the shaft we fit two semicircular split segments,
turned to a slightly smaller diameter than the inside diameter of the druin. These
segments are fast upon the shaft and revolve therewith, and together form two
semicircular portions of a ring, each capable of being expandel by wedge pieces
operating radially to the shaft. A bass with play in opposite directions, travels
with the segments, and is shaped so as to form bearings to the lower ends of two
levers, the outer ends of which are connectel with the shifting sleeve, by means of
links. The two wedges for expanding the segmental brake ring, are carried by
rods eccentrically pivoted to the aforesaid levers, the wedges being adjustable by
means of screws. The fork attached to the shifting pulley is attached to a bent
arm, which passes into another fork, hanging to the shaft by a loose collar held
between two collars fast on the shaft. The bent arm is fitted with screws or studs,
and the last mentioned fork is fitted with a pivoted hand lever, by means of which
the bent arm and consequently the first named fork is operated.
When the clutch segments are expanded by these means the wedges are locked,
by the action of the levers and eccentrically mounted links, the drum and shaft
then turning together, and the drum is released by a contrary movement of the
hand lever, withdrawing the shifting sleeve.
Dated 25th 1801
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.
COMPLETE SPECIFICATION.
Improvements in Friction Clutches.
We, WILLIAM HENRY CRANSTONE, of 25 High Street, Hemel Hempstead, in
the County of Hertford, Engineer, and WILLIAM ROBERT HAY, of 13 Christ-
church Road, Hemel Hempstead aforesaid, Engineer, do hereby declare the
nature of our said invention and in what manner the same is to be performed, to
be particularly described and ascertained in and by the following statement :-
The object of our invention is to manufacture and fit improved friction clutches
to pulleys, coupling shafts, and analogous appliances.
And in order that our said invention may be particularly described and
ascertained, reference is hereby made to the accompanying drawings, in which
similar figures of reference indicate corresponding parts.

page_text: Fig. 1 is a transverse elevation, partly in section, and
Fig. 2 is a longitudinal elevation, partly in section, showing the method of applying
our improved clutch.
Figs. 2 to 7 are sectional elevations showing two methods of applying the couplings
by means of hand levers.
8 is a drum or cylinder, mounted lousely on the shaft 9, one end of the
cylinder being uncovered. 10, 10, are two semicircular segments, turned to
a slightly smaller diameter than the inside diameter of the drum 8. The
segments 10, 10, are carried round with the shaft. 9 by means of arms 11 and
hoss 12, keyed to the shaft at 13. The two semi-circular portions 10, 10, are
capable of being expanded by means of cylindrical wedge-pieces 14, 14, operating
upon the angular ends of the segments, radially to the shaft.
The wedge
pieces 14, 14, are fitted loosely upon the ends of adjustable rods 15 fitted in
cylinders 16. The regulating screws 18 are used for tightening up the walge
pieces 14. The cylinders 16 are pivoted at 17 to bent levers 19. The lower
ends 20 of these levers are formed eccentric to the pivot 17. These eccentric ends
work in sockets formed in a collar 21. This collur 21 is carried round with the
shaft 9 by means of a screw 22. The bore of the collar 21 is slightly elliptical to
enable it to equalise the pressure of the two wedge pieces 14 independently of the
shaft. 23, 23, are links pivoted to the shifting sleeve 26 at 24, and pivoted to
the bent levers 19 at 25.
When the shifting sleeve 26 is moved towards the cylinder 8, the clutch
segments are forcibly expanded in the cylinder by the wedge pieces 14, the drum
and shaft then turning together. The drum is released by a contrary movement
of the sleeve, whereby the segments are released from contact with the internal
surface of the drum.
One method of shifting the sleeve 26 is shown in Figs. 3, 4 and 5; Fig. 3 being
a longitudinal elevation, partly in section, Fig. 4 an elevation, at right angles to
Fig. 3, and Fig. 5a separate view of our improved form of fork. 27, 27, are the
two pieces forming the fork fitting easily between the flanges of the sleeve
pulley 28. The bent arms of the fork 27 are fitted with rollers 29, 29.
30 is a
Sheave, fast on the shaft 9. 31 is a strap, in two parts, bolted to the sheave 30, s
that the sheave may turn freely in the strap, the latter being stationary. The
strap 31 has elongated pieces 51, between which the lever 33 is piroted at 34.
The form of the fork 27 is shown in Fig. 5.
By moving the lever 33 by hand, as shown by dotted lines in Fig. 3, the fork 27
and sleeve 26 may be moved in either direction as required.
Fig. 6 is longitudinal sectional elevation, and Fig. 7 a transverse elevation,
showing another method of mounting the fork 27, which is formed and mounted as
shown, the bent arm being fitted with studs 35. The strap 31 is provided with
elongations 37, 37, for supporting the folcrum bar 34, forming a fulcrum for the
bars 32, 32, which are carried down, as shown in Fig. 7, the handle bar 36 being
bolted thereto, as shown.
By moving the bar 36 in either direction, the bent bar and fork, with the
sleeve 26 attached thereto, are caused to assume the required position for engaging
or disengaging the clutch.
Having now particularly described and ascertained the nature of our snid
invention, and in what manner the same is to be performed, we declare that
what we claim is :--
1. The improvements in friction clutches substantially as and for the purposes
described.
2. In a friction clutch, the combination of a sleeve 26 turning with a shaft 9,
links 23 pivoted to the sleeve in the manner described, and to the outer ends of
bent levers 19, the ends 20 of such levers working in sockets in a collar 21;
cylindrical wedge pieces 14 mounted upon adjustable rods 15 in cylinders 16; the
cylinders being eccentrically pivoted to the bent levers 19; all capable of causing

page_text: the expansion of a split ring 10 and engaging and clutching an ordinary cylinder 8,
or an equivalent device for receiving or transmitting rotary motion, severally
operating substantially as herein before described and illustrated by the drawings.
3. In friction clutches, the combination of a sliding sleeve 26; a fork 27 carrying
a bent arm or bent arms, such arm or arms being fitted with rollers, studs, or
equivalent devices; stationary collars 31 fitted to revolving sheaves 30; and
pivoted hand levers, severally operating substantially as herein before described
and illustrated by the drawings.
TL MA 1905
GEO.
DOWNING,
8, Quality Court, London, W.C., Agent.