Improvements in Couplings for Broken Shafts.
Year: 1893

page_text: Date of Application, 8th Feb., 1893
Complete Specification Lett. 7th Nov. 1893-Accepted, 9th Dec., 1893
PROVISIONAL SPECIFICATION.
Improvements in Couplings for Broken Shafts.
I, ARCHIBALD THOMSON, of 108 Fenchurch Street, in the City of London,
Consulting Engineer, do hereby declare the nature of this invention to be as
follows, that is to say: :-
My said invention has for its object to provide improved couplings, which can be
speedily, conveniently, and effectively applied to broken shafts, the said couplings
being available for fractures of different kinds.
In carrying out my invention I provide for enclosing and gripping the broken
part of a shaft, in combination with connections operating longitudinally so as to
draw or hold together the parts separated by the fracture.
I employ two or more rings of improved and special construction, each ring
consisting of three segments which are exactly alike, and which are made of
wrought iron or preferably of steel. Each segment has formed at one end of it a
screwed horn or stud, and at the other end a fork or pair of jaws. When placed
on a shaft the stud of each segment passes through the fork of the adjacent
segment, and nuts screwed on the studs on the outer sides of the forks draw the
segments together and bind them upon the shaft. A pair of flanges is formed on
each segment at right angles to the axis at each edge or side of the segment, and
these flanges are bored to receive longitu linal screw bolts by which two or more
rings are connected and tied together, the nuts. on these bolts being placed on them
preferably between the two flanges of each ring or segment.
In the case of a fracture of the thrust shaft of a screw propeller the coupling
rings may be applied between the thrust collars, the longitudinal bolts passing
preferably just outside the collars. Where the length or extent of a fracture
requires it any number of the coupling rings may be combined. The segments are
all exactly alike, and of a form admitting of any desired. number of them, being
stowed conveniently in a small space.
The constructive details are susceptible of modification in various ways, the
essential features being the making of each ring in three segments with provision
for binding them on the shaft in combination with longitudinal bolt connections.
Deted thie Seventh day of February 1893.
EDMUND HUNT,
Applicant's Agent.
COMPLETE SPECIFICATION.
Improvements in Couplings for Broken Shafts.
I, Archibald THOMSON, of 108 Fenchurch Street, in the City of London,
Consulting Engineer, 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, that is to say :-
"My said invention has for its object to provide improved couplings which can be
speedily, conveniently, and effectively applied to broken shafts, the said couplings
being available for fractures of different kinds.
In carrying out my invention, I provide for enclosing and gripping the broken
part of a shaft, in combination with connections operating longitudinally, so as to
draw or hold together the parts separated by the fracture. I employ two or more
rings of special construction, each ring consisting of three segments which are

page_text: exactly alike, and which are made of wrought iron or preferably of steel. Each
segment has formed on it a pair of flanges, at right angles to the axis, at each edge
or side of the segment, and these flanges are bored to receive longitudinal screw
bolts by which two or more rings or sets of segments are connected and tied
together, the nuts on these bolts being placed on them preferably, between the two
Hanges of each ring or segment.
In the case of a fracture of the thrust length of a screw propeller shaft, the
coupling rings or sets of segments may be applied between the thrust collars, the
longitudinal bolts passing, preferably, just outside the collars. Where the length
or extent of a fracture requires it, any number of the coupling rings or sets of
segments may be combined. The segments are all exactly alike, and of a form
admitting of any desired number of them being stowed conveniently in a small
space.
The constructive details are susceptible of modification in various ways, the
essential features being the making of each ring in three segments with provision
for binding them on the shaft in combination with longitudinal connections.
And in order that my said invention and the manner of performing the same
may be properly understood, I hereunto append a sheet of, explanatory drawings
to be hereinafter referred to, and representing three modifications of my improved
couplings.
Figure, 1, is a transverse section, and Figure 2, is a side elevation of one
modification. A second modification is shown in Figures, 3, 4, and 5, which are
respectively a transverse section, a sectional side elevation, and a second transverse
section; and a third modification is shown in sectional side elevation and in
transverse section in Figures, 6, and 7.
In these drawings the same reference letters are used to mark the same or like
parts wherever they are repeated.
In the modification shown in Figures, 1, and, 2 each segment, A, has formed at
one end of it a screwed horn or stud, B, and at the other end a fork or pair of
jaws, C. When placed on the shaft.. S, the stud, B, of each segment, A, passes
through the fork, C, of the adjacent segment, and nuts, D, screwed on the studs on the
outer sides of the forks, draw the segments together and bind them upon the shaft.
A pair of flanges, F, is formed on each segment, A, and these flanges are bored
to receive longitudinal screw bolts, G, by which two or more rings or sets of
segments are connected, as shown in Figure, 2, the nuts on, the bolts, G being
placed on them between the two flanges, F, of each ring or segment. In Figure, 2,
two of the coupling rings or sets of segments are shown as placed on the shaft
between thrust collars, H, and as connected by longitudinal bolts, G, which
serve to hold or draw together the parts of the shaft on opposite sides of the
fracture.
In the modifications shown in Figures, 3, to 7, each segment, A, is made with
a fork or pair of jaws, C, at both ends of it; and the segments are connected
together by bolts, J, each made with right and left screw threads, and with its
middle part hexagonal to receive a screw key. Screw.nuts, K are placed at the
inner sides of the jaws, C, the inner faces of the jaws and the contact faces of the
nuts being slightly inclined to prevent the nuts from moving outwards. In
Figures, 3, 4, and 5, my improved couplings are shown as applied on opposite sides
of an ordinary coupling, L, fixing two shaft lengths to each other. In this case
the longitudinal connection is formed by bolting to the rings or sets of segments, A,
the flanged ends of a box, M, shaped to enclose the ordinary coupling, L, and
made in three segments which are bolted together by flanges, and which are also
shaped to grip the shaft.
In Figures, 6, and, 7, the application of two of my improved coupling rings or
sets of segments, A, is shown, to the collared thrust length of a screw propeller
shaft, the said rings being placed in two spaces between thrust collars, H,
whilst other spaces between collars are shown as occupied by the usual bearing
lates, N.

page_text: 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 :-
The improved couplings for broken shafts, in which rings, each made in three
segments, are provided with longitudinal bolt connections, the parts being
constructed and combined substantially as herein before described.
Dated this Sirth day of November 1893.
EDMUND HUNT,
Applicant's Agent.