IMPROVEMENTS IN GEAR AND OTHER WHEELS TO FACILITATE THEIR ATTACHMENT TO AND REMOVAL FROM SHAFTS
Year: 1876

page_text: LETTERS PATENT to Alexander Melville Clark, of 53, Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "IMPROVEMENTS IN
GEAR AND OTHER WHEELS TO FACILITATE THEIR ATTACHMENT TO AND
REMOVAL FROM SHAFTS." A communication from abroad by Benjamin Taylor
Mills, of Fall River, in the County of Bristol, and State of Massachusetts,
United States of America.
.
Sealed the 9th March 1877, and dated the 7th November 1876.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at the
Office of the Commissioners of Patents on the 7th November 1876.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of
Middlesex, Patent Agent. "IMPROVEMENTS IN GEAR AND OTHER WHEELS TO
FACILITATE THEIR ATTACHMENT TO AND REMOVAL FROM SHAFTS."
.
This Invention consists of the two parts of a split gear or other wheel so contrived
that the flanges on the side of one part fit upon and are bolted to the side of the
other part, so as to allow of applying to and removing from the shaft such wheels
in less space than is required when they are fastened by bolting two flanges
together at the sides of the wheel; and it also allows of one part of the wheel
being dovetailed in the other to sustain the expanding action of the key better than
the common way.
The Invention also consists in a notched or slotted wheel, to which is fitted a
section that is provided with lugs at its sides, the notch or slot being of suitable
form to receive the said section and its lugs.
According to the first improvement one part of the wheel has curved flanges
projecting from one side, suitably for fitting against the side of the other part, so as
to be secured thereto by bolts when the two parts are fitted together on the shaft.
In this example the one part comprises nearly the whole of the wheel, being only
as much less as is necessary to form an opening to admit the shaft to the centre.
Said notch or opening is made in dovetail shape, so that the other part of the wheel
will be securely held against the expanding effect of the key by which the wheel
is secured to the shaft; but I do not limit myself to this arrangement, as the second
part may comprise a third or more of the whole, and the dovetail form may be
omitted. When this dovetail form is employed the one part will enter its notch
[Price 6dr

page_text: in the other part from the direction of the shaft, in which case the wheel will have
to be located as far from another wheel or object on that side from which the part
enters as the thickness of the wheel at the hub.
The one part of the wheel may also have a slot or notch cut from the centre of
the bore to the periphery, with dovetail grooves formed in the sides of the notch to
receive a section of a wheel, which is of such form as to fill the notch and the
dovetail grooves, and thus complete the wheel. This section is driven into the wheel
sidewise, and is capable of resisting the strain produced by driving the key, and of
holding the wheel against the expanding effects of the key. The grooves may
be
made rectangular if desired.
Another arrangement consists of a wheel divided through the centre of its web
or arms at right angles with its shaft, and secured by bolts passing through both
sections of the wheel parallel to the shaft.
The advantage claimed for the improved wheel is that it can be placed on a shaft
without removing the same from its place, and without removing anything that
may be carried by the shaft. Its peculiar construction makes it nearly or quite as
strong as a solid wheel of the same proportions.
'
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the
4th May 1877.
ALEXANDER MELVILLE CLARK, of 53, Chancery Lane, in the County of Middlesex,
Patent Agent.
"IMPROVEMENTS IN GEAR AND OTHER WHEELS TO FACILITATE
THEIR ATTACHMENT. TO AND REMOVAL FROM SHAFTS." A communication from
abroad by Benjamin Taylor Mills, of Fall River, in the County of Bristol, and State
of Massachusetts, United States of America.
This Invention consists of the two parts of a split gear or other wheel so con-
trived that the flanges on the side of one part fit upon and are bolted to the side of
the other part, so as to allow applying to and removing from the shaft such wheels
in less space than is required when they are fastened by bolting two flanges
together at the sides of the wheel; and it also allows of one part of the wheel being
dovetailed in the other to sustain the expanding action of the key better than the
common way.
The Invention also consists in a notched or slotted wheel, to which is fitted a
section that is provided with lugs at its sides, the notch or slot being of suitable
form to receive the said section and its lugs.
Figure 1 is a side elevation of the improved split wheel; Figure 2 is a section
taken on line x, x, in Figure 1.
Figure 3 is a side elevation drawn on a smaller scale, showing the two parts
separated.
Figure 4 is a side elevation of a modified form of the improved wheel; Figure 5
is a section taken on line x¹, x¹, in Figure 4.
Figure 6 is another form of the improvement; Figure 7 is a vertical central
section of the same.
Similar letters of reference indicate corresponding parts.
Referring to Figures 1, 2, and 3 of the Drawing, A is one part of the wheel
and B the other. The latter has curved flanges C projecting from one sidé suitably
for fitting against the side of the part A, so as to be secured thereto by bolts Ď
when the two parts are fitted together on the shaft. In this example the part A
comprises nearly the whole of the wheel, being only as much less as is necessary to
form an opening E, Figure 3, to admit the shaft to the centre F; said opening is
made in dovetail shape, so that the part B will be securely held against the
expanding effect of the key by which the wheel is secured to the shaft, but I do.

page_text: not limit myself to this arrangement, as the part B may comprise a third or more
of the whole, and the dovetail form may be omitted. When this dovetail form is
employed the part B will enter its notch E in the other part from the direction of
the shaft, in which case the wheel will have to be located as far from another wheel
or object on that side from which the part B enters as the thickness of the wheel
at the hub.
A¹ in Figure 4 is a wheel having a slot or notch B₁ cut from the centre of the
bore to the periphery. Dovetail grooves a are formed in the wheel A¹ at the sides
of the notch B; C₁ is a section of a wheel, which is of such form as to fill the
notch B¹ and the dovetail grooves a, and thus complete the wheel. This section is
driven into the wheel sidewise, and is capable of resisting the strain produced by
driving the key and of holding the wheel against the expanding effects of the key.
The grooves a may be made rectangular, as shown in dotted lines, if desired.
In Figures 6 and 7 a modification of the Invention is shown, which consists of a
wheel divided through the centre of its web or arms at right angles with its shaft
at b, b, and secured by bolts c passing through both sections of the wheel parallel
to the shaft.
The advantage claimed for the improved wheel is that it can be placed on a
shaft without removing the same from its place, and without removing anything
that may be carried by the shaft. Its peculiar construction makes it nearly or
quite as strong as a solid wheel of the same proportions.
Having described the nature of the said Invention, and the manner of performing
the same, I declare that what I claim as the Invention to be protected by the
herein-before in part recited Letters Patent is,-
1st. A split wheel composed of two parts A and B, one of which has curved
flanges C fitting and bolted to the side of the other, substantially as herein shown
and described.
2nd. The part A having the dovetail notch E in combination with the part B
constructed to fit the said dovetail notch, and having the flanges C, substantially as
shown and described.
3rd. A split wheel composed of the part A¹, having the notch B¹, and the dove-
tail grooves a, and the part C¹, formed to fit the said notch and dovetail grooves,
substantially as herein shown and described.
4th. A split wheel G divided through the centre of its web or arms and rim at
right angles with the shaft and secured by bolts c passing through both sections of
the wheel parallel to the shaft, substantially as shown and described.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Fourth day of May, in the year of our Lord One
thousand eight hundred and seventy-seven.
1
A. M. CLARK. (L.S.)