Improvements in Cycle Frame and other Steel Tube Jointing.
Year: 1898

page_text: PROVISIONAL SPECIFICATION.
Improvements in Cycle Frame and other Steel Tube Jointing.
JAMES ROOTS, Engineer, 100, Westminster Bridge Road, London, do hereby
declare the nature of this invention to be as follows:-
The casting for the joint is made in a similar manner to those at present made
viz. with a V shaped piece cut out from the end or ends leaving two projecting
lugs, but the lugs are preferably made longer and with ridges or corrugations
cast on the outside surface. A. hole is drilled through the tube end and also
through the two lugs on the casting end, the hole in one lug and through one
side of the tube is larger than it is through the other lug. The lug with the
larger hole is tapped and the smaller hole is not tapped. A screw is fitted having
a shoulder at the smaller diameter. The screw when screwed in with a spanner
or otherwise by means of the shoulder widens the two lugs, and exerts great
pressure tending to expand the tube at this point, at the same time forcing the
tube to fit more or less the ribs on the outside of the lugs. When screwed
up as far as it is safe to expand it, the end of small diameter projecting through
the other side of the tube may be rivetted over to secure the whole joint in
position.
Improvements in Cycle Frame and other Steel Tube Jointing.
I, JAMES ROOTS, 100, Westminster Bridge Road, London, Engineer, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed to be particularly described and ascertained in and by the following
statement:-
The casting or stamping for the joint is made in a similar manner to those
at present made viz. with a V shaped or slotted piece cut out from the
end or ends leaving two projecting lugs but the lugs are preferably made longer
and they may have ridges or corrugations cast or otherwise formed on the outside
surface. A hole is drilled through the tube end & also through the two lugs on
the stamping or casting end, the hole in one lug and through one side of the tube
is larger than it is through the other lug. The lug with the larger hole is
tapped, and the smaller hole is not tapped. A screw is fitted having a shoulder
at the smaller diameter. The screw when screwed in with a spanner or otherwise,
by means of the shoulder widens the two lugs and exerts great pressure tending
to expand the tube at this point, at the same time forcing the tube to fit more

page_text: or less the ribs if these are used on the outside of the lugs. When screwed up
as far as it is safe to expand it, the end of the small diameter projecting through
the other side of the tube may be rivetted over to secure the whole joint in
position.
Fig. 1 is a section,, Fig. is an end view of the joint. A is the tube to be
joined to the tubular stamping or casting B which may or may not have corrugations
on its outer surface. The joint ends of either A or B may be of ordinary butted
tube or the screw side only of B may be butted. C is a screw made with a
shoulder C. The hole D is drilled of smaller diameter to fit the smaller end of
the screw C, and the hole E is tapped to fit the thread on the screw C. When the
screw has been screwed home it expands the inner tube casting or stamping A inside
Band securely holds it. The piece having the hole for the end of the screw which
receives the pressure of the screw on the one side may be a loose piece as shown
at C2 as also the piece for the screwed hole E instead of forming
them in one with the inner tube. The inner tube need not necessarily
be slotted or divided, to expand the inner tube or piece by pressing it by the
direct action of the screw against the outer slot is the necessary thing and this
may be done without slotting if the tubes are thin. The washer piece C2 having
the thread in it is only necessary where the inner tube, a stamping or other,
is too thin to take a sufficient number of threads. A similar washer piece but
without a screw such as C2 may be placed between the shoulder C and the
inner tube B where the latter is thin. It will be obvious that many modifications
of or additions to this construction might be made, such as a band of tube might
be fitted telescopically inside B or outside at this point to stiffen it.
It will be observed there is no wedging action, the action of the screw is direct.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed, I declare that what I
claim is;
1. Forming a tube joint in the manner described and shown.
2. Expanding an inner tube against an outer by means of the direct action
of a screw to form a joint as described.
3. The use of a screw in the manner described to form a joint, whether the
inner tube be split or otherwise.
4. In a tube joint the combination of a screw shoulder with a screwed washer
such as C2 with or without an unscrewed similar washer at the shoulder C¹.
Mh 9th 1000
JAMES ROOTS.