IMPROVEMENTS IN THE CONSTRUC- TION OF TRAMCAR AND RAILWAY WHEELS
Year: 1879

page_text: PROVISIONAL SPECIFICATION left by Cornelius Cadle and Arthur Mogg
Brown at the Office of the Commissioners of Patents on the 5th April
1879.
CORNELIUS CADLE, of Montpelier Hill, and ARTHUR MOGG BROWN, of Seville
Place, both of the City of Dublin, Ireland. "IMPROVEMENTS IN THE CONSTRUC-
TION OF TRAMCAR AND RAILWAY WHEELS."
This Invention relates to a peculiar construction of wheel for tram-car & railway
carriages, & has for its object the preventing the lateral displacement of the tyre
upon its arms, which we prefer to make of wrought iron or steel, also the securing
in an effectual & simple manner the arms in the boss, & tightening them against
the tyre. In carrying out our said Invention we roll or otherwise form an annular
groove round the inner circumference of the tyre, & similarly produce a corre-
sponding rib or feather on the outer face or circumference of the arms, which rib
fits into the groove in the tyre.
The arms are by preference bent to a loop form, thus
& one of the series is
left plain or without any rib or feather on its outer circumference.
With a view to holding the inner converging ends of the arms securely in the
nave or boss, & of tightening each arm effectually against the tyre, the inner ends
of the arms are fitted into recesses made to receive them in the said boss, & notches
are formed in the sides of the arms & of the said recesses, which notches coincide or
nearly so when the arms are placed in position; the arms are then tightened or forced
outwards against the tyre by driving into the said notches suitable keys or wedges.
A separate inner boss formed with a flange may be bolted to the outer or recessed
boss when the wheel is required to run loose upon its axle, by which arrangement
the inner boss can be readily removed & replaced by a new one when worn, at a
trifling cost, & without damaging any other part of the wheel. The tyre can also
be readily replaced without injury to the rest of the wheel. We prefer the tyre to
be of rolled steel or iron. In putting the parts of the wheel together the arms (all
but one) are placed in position in the tyre with their outer ribs or feathers fitting
into the internal groove in the tyre. The last arm having no outer rib or feather
is then slipped down into its place, thus fixing all the rest. The recessed boss is
then put into place, all the inner ends of the arms fitting into the recesses in the
said boss. The several keys or wedges are then inserted into the notches in the
boss and arms, & driven tight, thereby tightening the whole of the arms against
the tyre by forcing them outwards. The tyre is then to be expanded by heat, &

page_text: the keys or wedges driven still further, so that when the tyre contracts by cooling the
arms are firmly held in position.
Should it be found, which is almost impossible, that the tyre slides round the
arms, this can be effectually prevented by pins or bolts, as will be readily under-
stood, & if desired the shanks of the arms may be held together about midway
between the boss and the tyre by bolts or otherwise to prevent any tendency to
open or separate under the compression resulting from the contraction of the
tyre.
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