Improvements in Couplings for Shafts and the like.
Year: 1899

page_text: Date of Application, 6th Feb., 1899
Complete Specification Left, 6th Nov., 1899-Accepted, 6th Jan., 1900
PROVISIONAL SPECIFICATION.
Improvements in Couplings for Shafts and the like.
I, EDWARD JONES, of Wood View Smithies, near Barnsley, in the County of
York, Engineer, do hereby declare the nature of my said invention to be as
follows:
Although my invention is applicable to a variety of purposes it is more par-
ticularly applicable for repairing a broken shaft, such for example as a screw
propeller shaft on board ship at sea, where in such an emergency it is desirable
to have the means of uniting the fractured parts by the handiest appliances
which can be obtained, and without moving the shaft from its bearings.
I carry out my invention in the following manner.
My improved coupling consists of a bush and two outer sleeves or cramps
each segmentally divided in two or more parts, preferably in three parts as
herein described, the internal diameter of the bush being the same as the shaft
with which it has to be used.
Each segment of this bush is provided with two longitudinal lugs or pro-
jections, so formed that when the three segments are arranged circumferentially
upon the shaft, the last named lugs come face to face with the corresponding
lugs on the adjoining or complementary segments, but a sufficient space is left
between the joints to allow of them being tightened on the shaft by the grip
of the sleeves or cramps as hereinafter described. These longitudinal lugs have
their outer surfaces formed concentric with the bush, but they are gradually
tapered longitudinally in width from their outer ends towards the centre, the
sides of the lugs like the joints of the segments are formed radially.
When so placed and temporarily secured upon the shaft, the centres of the
joints between the three segments, and the centres of the three spaces between
the lugs on each segment are equi-distant the united width of the two lugs at
their outer ends at each joint being approximately the same as the space between
the two lugs on each segment.
Each segment of the sleeve is formed to clip the longitudinal lugs on the bush
so that the joints between the segments of the sleeve come mid-way between
the joints in the bush, and as the sides in the recesses in the sleeve segments
are formed radially and correspond to the sides of the lugs on the boss, the
said sleeve segments can only be passed over the lugs end ways, thus when the
sleeve segments have each been passed over the lugs from both ends of the bush,
the bush with the two sleeve rings is then held in position upon the shaft and the
temporary fastening can be removed.
In or about e centre of each joint of the sleeve segments, I form a bolt hole,
through these holes I pass bolts so as to connect the segmental sleeve rings
together, the connecting bolts being equi-distant, parallel with the axis of the
shaft, and with each other. The bolts having been thus placed in position and
being screwed for a suitable distance from their ends:-By means of six nuts,
two on each bolt, the segments of the two sleeve rings may be drawn towards
each other and to the centre of the bush longitudinally. As they advance to-
wards each other, by reason of the longitudinal ribs on the bush being tapered
n width, the segments of the bush are drawn closer together and their grip upon
the shaft increased until the broken parts of the shaft are firmly secured to-
gether.

page_text: As a modification of the last described arrangement, in some cases I employ
the segmental bush as already described with only one wide sleeve or cramp in
segments instead of two. In such case stud bolts could be screwed into the
ends of the bush segments, long enough to project beyond the ends of the sleeve
segments, when with the combination of washer plates and nuts, the sleeve can
be drawn into position tightly on the bush. In this arrangement it is obvious
that the taper on the bush lugs would be in one direction only.
In some cases instead of bolts, hydraulic jacks may be employed, and in some
cases the bush may be grooved, threaded, or serrated, to allow of its indenting
the shaft so as to enable it to better resist the torsional strain.
Dated this 4th day of February 1899.
R. HEBER RADFORD,
Agent for the Applicant.
Improvements in Couplings for Shafts and the like.
I, EDWARD JONES, of Boythorpe Villa, Derby Road, Chesterfield, in the County
of Derby, formerly of Wood View, Smithies, near Barnsley, in the County of
York, 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:-
Although my invention is applicable to a variety of purposes it is more par-
ticularly applicable for repairing a broken shaft, such for example as a screw
propeller shaft on board ship at sea, where in such an emergency it is desirable
to have the means of uniting the fractured parts by the handiest appliances
which can be obtained, and without moving the shaft from its bearings. I carry
out my invention in the following manner.
The nature of my invention will be better understood on reference to the
accompanying sheet of drawings in which,
Fig. 1. Is a longitudinal view of a shaft fitted with one of my improved
couplings.
Fig. 2. Is a transverse view of the shaft, shewing the end view of the coupling.
Fig. 3. Is a similar view shewing one set of the outer sleeves or cramps
removed.
Fig. 4. Is an end view of the segmental bush.
Fig. 5. Being a longitudinal view, looking from B to A, Fig. 4.
Fig. 6. Being a longitudinal view, looking from A to B, Fig. 4.
Fig. 7. Is an end view of the segmental outer sleeves or cramps.
The same letters refer to similar parts throughout the several views.
My improved coupling consists of a segmental bush, a, and two outer sleeves
or cramps, b, 1, each segmentally divided in two or more parts, preferably in
three parts as herein described, the internal diameter of the bush being the same
as the shaft, a with which it has to be used.
Each segment of this bush is provided with two longitudinal lugs or projec-
tions, d. d, so formed that when the three segments are
arranged cir
cumferentially upon the shaft, the last named lugs come face to face with the
corresponding lugs on the adjoining or complementary segments, but a sufficient
space is left between the joints to allow of them being tightened on the shaft by
the grip of the sleeves or cramps as hereinafter described. These longitudinal
lugs have their outer surfaces formed concentric with the shaft, but they are
gradually tapered longitudinally in width from their outer ends towards the

page_text: centre as shewn in Figs. 5 & 6, the sides of the lugs like the joints of the
segments are formed radially.
When so placed and temporarily secured upon the shaft the centres of the
joints between the three segments, and the centres of the three spaces between
the lugs on each segment, are equi-distant, the united width of the two lugs at
their outer ends at each joint being approximately the same as the space between
the two lugs on each segment.
Each segment of the sleeve, b, and b, is formed to clip the longitudinal lugs
on the bush, so that the joints between the segments of the sleeve come mid-way
between the joints in the bush, and as the sides in the recesses in the sleeve
segments are formed radially and correspond to the sides of the lugs on the bush,
the said sleeve segments can only be passed over the lugs, end ways thus when
the sleeve segments have each been passed over the lugs from both ends of the
bush, the bush with the two sleeve rings is then held in position upon the
shaft and the temporary fastening can be removed.
In or about the centre of each joint of the sleeve segments I form a bolt
hole, e, through these holes I pass bolts, f, so as to connect the segmental sleeve
rings b,, together, the connecting holes being equi-distant, parallel with the
axis of the shaft and with each other. The bolts having been thus placed in
position and being screwed for a suitable distance from their ends. By means
of six nuts, two on each bolt, the segments of the two sleeve rings may be drawn
towards each other and to the centre of the bush longitudinally. As they
advance towards each other, by reason of the longitudinal ribs on the bush being
tapered in width, the segments of the bush are drawn closer together and their
grip upon the shaft increased until the broken parts of the shaft are firmly
secured together.
In order to prevent any of the segments of the bush, b, being forced in advance
of one another during the process of screwing up the sleeves, b,, I provide a lug
or key, g, on each segment with a corresponding recess on the complementary
segment by means of which the several parts may be kept together.
As a modification of the last described arrangement, in some cases I employ
the segmental bush as already described with only one wide sleeve or cramp in
segments instead of two. In such case stud bolts could be screwed into the
ends of the bush segments long enough to project beyond the ends of the sleeve
segments, when with the combination of washer plates and nuts the sleeve can
be drawn into position tightly on the bush. In this arrangement it is obvious
that the taper on the bush lugs would be in one direction only.
In some cases the bush may be grooved, threaded or serrated, to allow of its
indenting the shaft so as to enable to better resist the torsional strain. .
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 a coupling for uniting the parts of a fractured shaft, the arrangement
and combination of parts and appliances comprising the segmental bush, a, two
outer sleeves or cramps, b, b, each segmentally divided into two or more parts,
each segment of the bush being provided with two longitudinal lugs or pro-
jections tapered longitudinally, each segment of the outer sleeve or cramp being
provided with recesses to grip the said lugs on the bush and provided with bolts
by means of which the two sleeves, b, b1, may be drawn together in the manner
and for the purposes substantially as herein described and illustrated.
Dated this the 30th day of October 1898.
R. HEBER RADFORD,
Agent for the Applicant.