Year: 1895

page_text: 1, ARCHIBALD SHARP, of 13, Fairlawn Grove, Chiswick, in the County of
Middlesex, Engineer, do hereby declare the nature of this invention to be as
follows:-
My invention has for its object the formation of a shaft-coupling, the largest
diameter of which shall be as small as possible compared with that of the body of
the shafting, and likewise the flanges to be formed on the ends of the various
lengths of shafting shall be as small as possible.
In this coupling 1 enlarge the ends of the portions of shafting to be connected,
so as to form two small thick flanges equal in diameter. A cylindrical ring, of
axial length equal to the sum of the thicknesses of the two flanges, and whose
inner diameter is the same as that of the aforesaid flanges, is placed over the said
flanges, so that its two plane end faces coincide with two plane surfaces of the
flanges. When the ring is in this position a number of bolt-holes with axes
parallel to that of the shafting are drilled, the axes of the bolts lying on or near
the cylindrical surface which forms the inner boundary of the aforesaid ring and
the outer boundary of the aforesaid flanges. Bolts or pins are fitted in these
holes, and may be fastened in position by nuts. The bolts or pins may be
parallel-bodied, but it will probably be most convenient to have them tapered to
facilitate fitting.
The action of the coupling will be as follows:-The flange on the end of the
driving length of shaft will transmit the turning effort to the aforesaid ring by the
shearing stress on the bolts along half their length, the said ring will then transmit
the turning effort to the flange of the next length of shaft by means of the
shearing stress along the second half of the bolts. If the thickness of the aforesaid
flanges, and therefore the length of the aforesaid bolts, he conveniently chosen, it
will be possible to use smaller bolts than in the ordinary form of flange coupling at
present in use.
Instead of bolts or pins of circular section, it is evident that rectangular keys
may be employed; especially in shafting that is not subjected to longitudinal
tension.
Dated this Fourteenth day of October 1805.
ARCHD. SHARP.
An Improved Shaft-coupling.
I. ARCHIBALD SHARP, 13 Fairlawn Grove, Chiswick, in the County of
Middlesex, 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 has for its object the formation of a shaft-coupling, the largest
diameter of which shall be as small as possible compared with that of the body of
г»..

page_text: the shafting, and likewise the flanges to he formed on the ends of the various
lengths of shafting shall be as small as possible.
Figure 1 is an end view, and Figure 2 an longitudinal view partly in section, oi
the shaft-coupling.
In this coupling enlarge the ends S of the portions of shafting to be connected,
80 as to form two small thick flanges F, F equal in diameter. A cylindrical ring R
of axial length equal to the sum of the thicknesses of the two flanges, and whose
inner diameter is the same as that of the aforesaid flanges, is placed over the said
flanges so that its two plane end faces coincide with the two plane surfaces of
the flanges. The right hand portion of Figure 2 is a section shewing the two
flauges, and the coupling ring R in their relative position. When the ring is
in this position a number of bolt-heles H with axes parallel to that of the shafting
are drilled, the axes of the bolts lying on, or near, the cylindrical surface which
forms the inner boundary of the aforesaid ring and the outer boundary of the
aforesaid flanges. Bolts B, or pins, are fitted in these holes and may be fastened
in position by nuts. The bolts or pins may be parallel-bodied, but it will
probably be must convenient to have them tapered, to facilitate fitting. The left
hand portion of Figure 2 is a sectional view shewing the bolt in its position
relative to the flanges F, F and coupling-ring R.
The action of the coupling will be as follows:-The flange on the end of the
driving length of shaft will transmit the turning effort to the aforesaid ring R, by
the shearing stress on a longitudinal section of each bolt along half its length and
on two half transverse sections; the said ring R will then transmit the turning
effort to the flange of the next length of shaft by means of the shear on the second
half of each bolt. If the thickness of the aforesaid flanges, and therefore the
length of the aforesaid bolts be conveniently chosen, it will be possible to use
smaller bolts than in the ordinary form of flange coupling at present in use.
Instead of bolts or pins of circular section, it is evident that rectangular
keys may be used; especially in shafting that is not subjected to longitudinal
tension.
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 :-
A shaft-coupling consisting of flanges on the two ends of the shafts to be coupled
together, a coupling-ring encircling the said flanges, and a number of bolts fastening
the said flanges and coupling-ring together; the centres of the bolt-holes lying on
or near the bounding surface of the Hanges and coupling-ring: substantially as
herein before described.
Tad this south don a LL. 180G