Improvements in the Construction of Bicycle and other Frames.
Year: 1897

page_text: Date of Application, 21st Oct., 1897
Complete Specification Left, 12th July, 1898- Accepted, 3rd Sept., 1898
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Bicycle and other Frames.
I, JOHN HENRY COATMAN, of Summer Hill, Delph, Saddleworth, in the County
of Yorkshire, Engineer and Millwright, do hereby declare the nature of this inven-
tion to be as follows:-
My invention relates to improvements in the construction of bicycle and other
frames, the object being to provide an easy method of building up cycle and other
frames without brazing or employing the application of heat in any form, and
which moreover allows of the various parts being finished before building up,
while the completed frame is considerably stronger than those constructed by the
ordinary or well known method, of brazing the parts together.
In carrying my invention into practical effect, the lugs or connections for joining
the tubes are bored for a sufficient depth to the size of the external diameter of
the tube to be joined, the remainder of the lugs being bored and internally screw
threaded with a fine thread. The ends of the tubes are correspondingly screw
threaded to fit the lugs or connections, so that they may be tightly screwed into
same.
Before the tubes are screwed into position, the lugs or connections are split or
divided by suitable means for a sufficient distance and the tubes are strengthened
internally with cores of light dry wood, cane, or other suitable material which may
be either solid or with a hole bored centrally through same for lightness, and in
order to ensure a good and close fit the cores or linings may be formed in two parts
each part being made to taper a little and are then inserted in the tubes after the
manner of wedges and sawn off flush with the ends of the tubes.
The tubes are then tightly screwed into the lugs or connections when suitable
ferrules are tightly driven over the latter and the frame drilled and pegged as
required to prevent the various parts turning.
Improvements in the Construction of Bicycle and other Frames.
I, JOHN HENRY COATMAN, of Summer Hill, Delph, Saddleworth, in the County
of Yorkshire, Engineer and Millwright, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed, to be particularly described
and ascertained in and by the following statement:-
My invention relates to improvements in the construction of bicycle and other

page_text: frames, the object being to provide an easy method of building up cycle and other
frames or tubular structures without brazing or employing the application of heat
in any form, and which moreover allows of the various parts being finished before
building up, while the completed frame is considerably stronger than where the
ordinary or well known method of brazing the parts together is employed.
In order that my invention may be fully understood I will now proceed to
describe same with reference to the accompanying drawings in which Fig. 1 is
a side elevation of a frame of a velocipede constructed according to this invention.
Fig. 2 is a longitudinal section through one of the joints. Fig. 3 is a cross
section through a similar joint, and Fig. 4 is a plan of the bottom bracket.
According to this invention the lugs or connections for joining the tubes are
bored for a sufficient depth to the size of the external diameter of the tube to be
joined, while the remained of the lug is bored and internally screw threaded with
a fine thread. The end a of the tube (Fig. 2) is correspondingly screw threaded
to fit the lug or connection 7 so as to be tightly screwed into same. The extremity
of each lug 7 is reduced in diameter as at f (Figs. 2, 3 & 4) and split or divred
longitudinally for a sufficient depth as at 6 so that when the tubes have been screwed
into position the lug can be tightened on to same by ferrules or caps d which
are driven over the said reduced extremities, the said cap or ferrule and the whole
of the parts being kept in position and prevented from turning by means of a
suitable pin such as p.
Before the tubes are screwed into position they may be strengthened internally
with cores e of light dry wood, cane or other suitable material, said cores being
either solid or with a holes h bored through them for lightness, or the said cores
may be formed in two parts the meeting edges tapering in such a manner as to
allow of their being driven into the tubes after the manner of wedges in order to
ensure a good and close fit.
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:-
The new or improved joint for use in connection with the building of cycle and
other frames comprising an internally bored and screw threaded lug or connection
such as furnished with slits or divisions such as b, a tube screw threaded at its
extremity as at a (Fig. 2), in combination with ferrules or caps such as d and a
locking pin or the like such as p, with or without cores c, the whole combined and
arranged substantially as described and shown with reference to the accompanying
drawings.