AN IMPROVEMENT IN THE CONSTRUC- TION OF SEGMENT WHEELS
Year: 1879

page_text: LETTERS PATENT to James Barbour, of Belfast, in the County of Antrim,
Ireland, Machinist, for the Invention of "AN IMPROVEMENT IN THE CONSTRUC-
TION OF SEGMENT WHEELS.”
Sealed the 7th May 1880, and dated the 13th November 1879.
PROVISIONAL SPECIFICATION left by the said James Barbour at the Office
of the Commissioners of Patents on the 13th November 1879.
JAMES BARBOUR, of Belfast, in the County of Antrim, Ireland, Machinist.
IMPROVEMENT IN THE CONSTRUCTION OF SEGMENT WHEELS."
"AN
This Invention relates to the construction of wheels made in segments, being
specially designed for grooved fly wheels for driving by ropes, or plain pullies for
belts, and consists of a novel method of attaching the rim to the nave by means of
a series of bolts or tie rods extending from the rim to the nave, so dispensing with
a multiplicity of bolts to connect the rim to the arms and to the nave through them
as heretofore. Thus a simple wrought iron bolt is used to overcome the centrifugal
force of the rim. The arms are made hollow so that the tie bolts pass through and
inside them. The rim and nave are recessed to receive the ends of the arms.
By this method of construction a wheel can be made without any objectionable
projections from the principal surfaces, and so the currents of air generated by the
high velocity of the rim are lessened, which is very desirable in pullies for driving
by ropes or belts where a high velocity is specially advantageous.

page_text: •
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said James Barbour in the Great Seal Patent Office on the 11th May
1880.
JAMES BARBOUR, of Belfast, in the County of Antrim, Ireland, Machinist.
IMPROVEMENT IN THE CONSTRUCTION OF SEGMENT WHEELS."
"AN
This Invention relates to the construction of wheels made in segments, being
specially designed for grooved or plain fly wheels for driving by ropes or belts.
The nature of this Invention will be understood from the following description,
reference being had to the accompanying Drawing, wherein the same letters and
figures of reference always apply to the same or like parts.
Fig. 1 is a partial side view and section of a grooved segment wheel constructed
on this improved method; Fig. 2 is a section, taken in the dotted line of Fig. 1,
through the rim c, arm a, and boss or nave 6 of the wheel; and Fig. 3 is a cross
section of one of the arms a.
The Invention consists of a novel method of attaching the rim c of wheels made
in segments to the nave b. This I effect by means of a series of bolts or tie-rods d
extending from the rim c to the nave b, and I thereby dispense with the use of a
multiplicity of bolts for connecting the rim c to the arms a, and through the arms a
to the nave bas heretofore.
The arms a are made hollow so that the tie-rods or bolts d may pass through
them. The rim c and nave b are recessed to receive projecting pieces a¹, a¹, on the
ends of the arms a. The head of the bolt or tie-rod d' can be made to form part of
the periphery of the wheel.
The bolts or tie-rods have slots formed in their inner ends to receive keys b',
which are passed into the nave through holes made therein parallel to the axis of
the nave, and thereby serve to secure the rim of the wheel and nave together.
Thus simple wrought iron bolts d are used to overcome the centrifugal force of the
rim c, and by this method of construction a wheel can be made without any
objectionable projections from the principal surfaces, and so the currents of air
generated by the high velocity of the rim are lessened, which is very desirable in
segment wheels for driving by ropes or belts where a high velocity is specially
advantageous.
Having now set forth the nature of my Invention of "An Improvement in the
Construction of Segment Wheels," and explained the manner of carrying the same
into, effect I wish it to be understood that under the above in part recited Letters
Patent I claim, connecting together the parts composing a segment wheel by bolts
or tie rods in the manner and for the purpose above described.
In witness whereof, I, the said James Barbour, have hereunto set my hand
and seal, the Eighth day of May, in the year of our Lord One thousand
eight hundred and eighty.
TALER
DADDOTID