Improvements in Couplings for Shafting.
Year: 1892

page_text: Date of Application, 17th Nov., 1892
Complete Specification Left, 17th Aug., 1893-Accepted, 23rd Sept., 1893
PROVISIONAL SPECIFICATION.
Improvements in Couplings for Shafting.
I, JAMES FREDERICK HOOLE of Frederick Street, Darnall, Sheffield in the
County of York, Engineer, do hereby declare the nature of my invention to be as
follows:-
:-
This invention relates to improvements in the construction of couplings for
joining or connecting the ends of machine shafting and similar shafting, the object
being to construct a coupling that put upon the shafting securely, and be removed
therefrom with facility, and that may be used without keyways sunk in the
shafting.
I propose to use two circular coupling plates with extending central bosses,
similar in appearance to those at present in use, one to be placed upon each of the
shaft ends that are to be coupled together.
The couplings are bored out from the face side, towards the outer end of the boss,
to within a certain distance from the end, say for example three quarters of an inch,
the hole so bored tapering from front to back, and being considerably larger even
at the smaller end than the diameter of the shaft.
The hole through the remaining part described as being three quarters of an inch
thick, is bored out to fit easily upon the shaft, and through this collar of metal
I make any desired number but preferably three or four rectangular openings or
keyways.
The keys are made long enough to pass through both the couplings and to
project at both ends; they are made to taper from the centre to each end on their
top faces only, and curved to fit against the inside of the coupling when it is bored
out taper. The underside of the key is inade concave to fit upon the shaft, and
the ridge or centre of the keys should be directly over the junction of the two
shafts.
The disc faces of the couplings are provided with bolt holes and bolts for drawing
the two parts together, and one or both parts are provided with screwthreaded
holes and set screws the ends of which bear against the face of the opposite
coupling, and by which the two may be forced apart.
When the coupling plates are put on the shafts and drawn apart the keys are
inserted through one coupling and brought into position at the joint, the other plate
is then drawn up the tapered keys and the two parts bolted together; this action
forces the keys down upon the shafting and binds the whole of the parts together.
Dated the 14th day of November 1892.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.
COMPLETE SPECIFICATION.
Improvements in Couplings for Shafting.
I, JAMES FREDERICK HOOLE of Frederick Street, Darnall, Sheffield in the.
County of York, 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 :-
My invention relates to improvements in the construction of couplings for
connecting the adjacent ends of lengths of driving or line shafting and other similar
shafting, the object being to construct a coupling that can be readily fixed or
CD

page_text: removed without the use of skilled labour, and that does not require keyways to be
sunk into the shafting.
A coupling made according to my invention is illustrated in the annexed sheet
of drawings, in which
.
Fig. 1, is an elevation of a complete coupling as fixed upon the shafts.
Fig. 2, elevation of inside face of one part.
Fig. 3, elevation of outside of same.
Fig. 4, side elevation of same part in section.
Fig. 5, one of the keys.
In carrying out my invention as illustrated, I make two circular coupling
plates A and A' with entending central bosses B and B', one of which is to be
secured upon each of the shaft ends C and C that are to be coupled together.
The coupling plates are bored out centrally from the inner face side, towards and
within a short distance from the outer end of the boss B, say for example three
quarters of an inch in a coupling for a 2" shaft and tapering from the face to the
back, shown in Fig. 2 marked D, the smaller end of the tapered part being
considerably larger than the diameter of the shaft C or C¹.
The remaining part of the hole mentioned above as threequarters of an inch and
marked E, is bored out to fit easily upon the shafting, and through this collar of
metal threequarters of an inch thick for example I make any desired number of
rectangular openings or keyways F, to receive the keys G, shown in Fig. 5.
The keys are made long enough to pass through and project beyond both parts
of the coupling; they are tapered from the centre to each end on their top face
only and are curved or made convex to fit against the inside of the coupling where
it is bored out taper.
The underside of the key is made concave to fit upon the shaft, and the ridge H,
or centre of the key should be equidistant from the face of each coupling plate, or
directly over the junction of the shafts. The disc-like faces of the coupling plates
are provided with bolt holes I, and bolts J, are used to draw the two parts together;
there are also in one or both plates set screws K, which bear against the face of the
opposite plate, and by which when force is applied to them, the two parts of the
coupling may be forced apart and off the keys.
When the coupling plates are put upon their respective shafts, and drawn apart,
the keys are inserted through one coupling and the keyways before described, and
brought into position over the junction of the shafts, the other plate is then drawn
over the tapered ends of the keys and the two parts bolted together, this action of
screwing up the bolts J, and drawing the plates together, forces the keys upon the
shafting and binds the whole of the parts together.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same may be performed, I declare that what I
claim is :-
1. A coupling for shafting constructed in the manner herein before described and
as illustrated in the drawings annexed..
2. A coupling for shafting, consisting of two plates A and A¹, with bosses B
and B', bored out with tapered centre holes, fitting upon keys G, made tapering
from the centre, and drawn together by bolts J, substantially as hereinbefore
described and shown.
3. In a coupling such as hereinbefore described, the combination of the tapering
centre holes D, and oppositely tapered keyways F, for the purpose specified.
Dated the 15th day of August 1893.
ROBT. F. DRURY, C.P.A.,
Bank Buildings, George Street, Sheffield, Agent for Applicant.