Improvements in Shaft Couplings.
Year: 1891

page_text: Date of Application, 11th Sept., 1891
Complete Sp-cification Lelt, 20th Jan., 1892-Accepted, 27th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in Shaft Couplings.
GEORGE SMITH and EDWIN SMITH Engineers of Nene Side Iron Works
Thrapston in the County of Northampton do hereby declare the nature of this
invention to be as follows:-
This invention relates to improvements in that type of shaft couplings commonly
known as clamp or grip couplings.
The object of this invention is to provide a clamp or grip coupling, that will
grip two shafts firmly & accurately when one shaft is slightly smaller in diameter
than the other.
Our improvement consists in forming the clamp or grip coupling so that each
shaft is gripped independently of the other and this we accomplish by splitting or
dividing one half of the coupling and leaving the other half rigid.
We make our coupling of cast iron or other metal, and fix it by bolts on one
or both sides or by being screwed externally or any other suitable means of
clamping the parts together.
Dated 11th day of September 1891.
GEORGE SMITHI.
EDWIN SMITH.
COMPLETE SPECIFICATION.
Improvements in Shaft Couplings.
We GEORGE SMITH and EDWIN SMITH, Engineers of Nene Side Iron Works,
Thrapston in the County of Northampton 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:-
This invention relates to improvements in that type of shaft couplings, commonly
known as clamp or grip couplings.
The object of this invention is to provide a clamp or grip coupling that will
grip two shafts firmly and accurately when one shaft is slightly smaller in diameter
than the other.
Our improvement consists in forming the clamp or grip coupling, so that each
shaft is gripped independently of the other, in manner described below and
illustrated in accompanying drawings.
The drawings illustrate several ways of carrying out our invention, in all the
figures the same letters of reference indicate the same or corresponding parts.
Figs. 1. 2. 3. 4 and 5 show the manner in which we preferably carry out our
invention when constructed in cast metal, Fig. 1 being a side elevation, Fig. 2 a
plan, Fig. 3 a sectional elevation on A-A Fig. 1, Fig. 4 an end elevation, and
Fig. 5 a sectional elevation on B-B Fig. 1.
This coupling is cast entirely in one piece, the portions C and D are separated
from the main body by the spaces shown, excepting a strip d Figs. 3, 4 and 5.
By this means the two shafts to be coupled are gripped separately by the portions C

page_text: and D, by means of the bolts I, which draw together the ends of the portions C
and D, and the main body of coupling on the open side, additional bolts F are
inserted at the opposite side of the coupling as shown, to prevent slipping in case
of fracture of the connecting strip d, during working, these bolts are however only
intended as a precautionary measure, the coupling being complete without them.
The main body P forms the other half of the coupling and carries a projecting
half flange G.
The portions C and D have flanges H, similar to centre flange (, and are con-
nected together when set, by a bolt I and distance piece J. In some cases we use
two or more bolts I, and distance piece J. A light cylindrical cover L, may be
provided it necessary.
In some cases we form the portions C and D entirely separate from the body of
the coupling and secure them by the bolts E and F, although in most cases we
prefer to cast them with the main body as previously mentioned.
Figs. 6 and 7 show a modification in which the portions C and D are entirely
separate from the main body of the coupling, the gripping of the shaft is effected
by two collars K, which screw on to taper ends of the portions C and D, and
main body, in some cases the taper ends of the portions C and D, are made plain,
and the two collars K, are driven on to connect them with main body. Fig. 6
shows the coupling put together, and Fig. 7 the different portions detached, or
alternatively the portions C and D may be formed in one piece with main body P,
as in the case of Figs. 1 and 2, the gripping being still given by the taper screwed,
or plain collars.
•
Figs. 8 and 9 show one method by which a coupling may be constructed of
wrought metal, the independent clamping of the two shafts, being effected by
slotting or dividing the two portions as shown at M.
Figs. 10 and 11 show our peculiar method of clamping as applied to an ordinary
flanged coupling.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we wish it to be particularly
understood, that we do not bind ourselves to the exact details described but we do
declare that what we claim is :
(1) In shaft couplings of cast or wrought metal, the gripping or clamping of
each shaft, independently and by separate means, substantially as set forth in the
accompanying Specification.
(2) The cast metal coupling as shown in Figs. 1. 2. 3. 4 and 5 or any mere
modification thereof, substantially as described.
(3) The screwed split coupling, substantially as shown in Figs. 6 and 7 and as
described.
(4) The forms of wrought iron clamp or strap couplings as shown in Figs. 8
and 9.
Dated this 20th day of January 1892.
GEORGE SMITH.
EDWIN SMITH.