IMPROVEMENTS IN TOOTHED GEARING
Year: 1880

page_text: LETTERS PATENT to George Ben Goodfellow, of the Firm of Benjamin
Goodfellow, of Hyde, in the County of Chester, Engineer, for an Invention
of "IMPROVEMENTS IN TOOTHED GEARING."
PROVISIONAL SPECIFICATION left by the said George Ben Goodfellow at
the Office of the Commissioners of Patents on the 13th February 1880.
GEORGE BEN GOODFELLOW, of the Firm of Benjamin Goodfellow, of Hyde, in the
County of Chester, Engineer. "İMPROVEMENTS IN TOOTHED GEARING."
My Invention relates generally to the spur, bevel, mitre, and other toothed gearing
When
employed in the transmission of rotatory motion, as is well understood.
toothed wheels are subjected to great strain breakage sometimes occurs, and in
such cases I have found that the fracture takes place at or about at the junctions
of the arms with the rim of the wheel, and I am led to believe that such fracture
is due in some cases to the extra rigidity at the said junctions. To remedy this
defect is the object of my Invention, and to this end I connect the arms with the
rim at or near the two opposite edges of the rim only, leaving an intermediate
space extending around the inside of the rim free from any direct connection with
the boss or hub of the wheel. In one construction I connect the rim with the hub
by means of flat or nearly flat armis which extend from the sides or edges of the
rim to the said hub, the intermediate space being formed by means of cores, or
being otherwise formed in the moulding of the wheel. The arms on one side may
be opposite to the arms on the other side, or be opposite to the spaces between the
arins on the otber side, as preferred or found to be most advantageous. Two, three,
The connection of
or more arms may connect each edge of the rim with the hub.
each arm with the hub may be stiffened by means of gusset ribs extending at right-
angles to the arm, or be otherwise suitably stiffened. I vary the form of the arm
as found or considered to be most suitable; as for example, I may curve the arm
or part of the arm so as to decrease the rigidity of the connection of the rim with
the central hub or boss, and I may employ arms which are forked so as to be con-
nected with the two edges of the rim.
My Invention is also applicable in cases wherein the wheels are formed in
segments or parts, and in cases wherein the arms are cast or formed separately from
the rim and bolted or attached thereto.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said George Ben Goodfellow in the Great Seal Patent Office on the 13th
August 1880.
GEORGE BEN GOODFELLOW, of the Firm of Benjamin Goodfellow, of Hyde, in the
County of Chester, Engineers. "IMPROVEMENTS IN TOOTHED-GEARING."
My Invention relates generally to the spur, bevel, mitre, and other toothed gearing
employed in the transmission of rotatory motion, as is well understood. When
toothed wheels are subjected to great strain breakage sometimes occurs, and in such
cases I have found that the fracture takes place at or about at the junctions of the
arms with the rim of the wheel, and I am led to believe that such fracture is duc
in some cases to the extra rigidity at the said junctions. To remedy this defect is
'the object of my Invention, and to this end I connect the arms with the rim at or
near the two opposite edges of the rim only, leaving an intermediate space extending
around the inside of the rim free from any direct connection with the boss or hub
of the wheel. In one construction I connect the rim with the hub by means of flat
or nearly flat arms which extend from the sides or edges of the rim to the said
hub, the intermediate space being formed by means of cores, or being otherwise
formed in the moulding of the wheel. The arms on one side may be opposite to
the arms on the other side, or be opposite to the spaces between the arms on the
other side, as preferred or found to be most advantageous. Two, three, or more
arms may connect each edge of the rim with the hub. The connection of each arm
with the hub may be stiffened by means of gusset ribs extending at right-angles to
the arm, or be otherwise suitably stiffened. I vary the form of the arm as found
or considered to be the most suitable; as for example, I may curve the arm or part
of the arm so as to decrease the rigidity of the connection of the rim with the s
central hub or boss, and I may employ arms which are forked so as to be connected
with the two edges of the rim. My Invention is also applicable in cases wherein
the wheels are formed in segments or parts, and in cases wherein the arms are cast
or formed separately from the rim and bolted or attached thereto.
And in order that my Invention may be fully understood, I have attached
hereunto a Sheet of Drawings to which I will now refer. Fig. 1 represents a front
view, and Fig. 2 a vertical section of a mitre wheel formed in accordance with my
Invention. In this example the rim a of the wheel is connected with the boss or
hub b by means of ten arms, or it may be said by means of five pairs of arms c, c'.
Between the front arm c and the back arm c is a clear space which extends
entirely around the hub, and which in the example would be formed by means
of a core.
The rim and hub are stiffened by means of ribs or flanches d, d; but in
some cases such ribs may not be considered to be necessary. The number of arms
or pairs of arms may be varied to suit the circumstances of any case. The remaining
Figures illustrate some of the variations which may be made in the form and dis- 4
position of the arms. Figs. 3 and 4 represent a spur-wheel having the rim
connected with the hub by means of eight arms; four of these arms c connect
one edge of the rim with the hub, and the other four arms c' connect tho other
edge of the rim with the hub, the latter arms being situated opposite to the spaces
between the arms c, as seen in Fig. 3. The connection of the arms with the hub 4
is strengthened by means of gusset-ribs e; Fig. 5, representing a half section of a
spur-wheel, indicates a method of lessening the rigidity of the connection of the
rim of the wheel with the hub by making the arms curvilinear in form. The arms
may be otherwise curved, corrugated, or bent in order to impart the indicated
property to the wheel. Fig. 6 also represents a half section of a spur-wheel; in 5
chis example the usual number of arms are or may be used to connect the rim with
the hub; but each arm is forked at its outer end, and the two extreme ends of the
fork are connected with the opposite edges or sides of the rim of the wheel. The

page_text: form of the fork may be varied without departing from the nature and intent of
my Invention. In all of the illustrated examples the wheels are supposed to be
cast in one piece; but it must be understood that my Invention is also applicable
to wheels which are cast or formed in segments, and also to cases wherein the rim
is cast separately from the arms and hub, either in one piece or in segments. In
some cases I may cast the rim or ring of teeth in one piece, and bolt or attach to
the two opposite sides of the said rim two castings or plates which are attached
to the limb, or which are each formed with a hub, or one casting or plate may
be formed with a hub to which the other casting or plate is bolted or attached.
Having now fully set forth and indicated the nature of my said Invention, and
the manner in which I propose to carry the same into practical effect, I would have
it to be understood in conclusion that I claim,―
First. The methods of constructing or forming toothed wheels, substantially as
and for the purpose set forth and indicated herein before and in and by the accom-
panying Drawings.
Secondly. Arranging the arms of toothed wheels in pairs, the two arms in each
pair being connected with the opposite sides or edges of the toothed rim, sub-
stantially as set forth and indicated.
And, lastly. The improved method of connecting the toothed rims with the hubs
of toothed wheels, substantially as set forth and indicated.
In witness whereof, I, the said George Ben Goodfellow, have hereunto set
my hand and seal, this Thirtieth day of July, in the year of our Lord One
thousand eight hundred and eighty.
GEORGE BEN GOODFELLOW. (L.S.)