Improvements in Joints of Velocipedes,
Year: 1897

page_text: Date of Application, 22nd Nov., 1897
Complete Specification Left, 22nd Sept., 1898-Accepted, 22nd Nov., 1898
PROVISIONAL SPECIFICATION.
Improvements in Joints of Velocipedes,
I, PHILIP LOUIS RENOUR, of 19 & 20, Holborn Viaduct, in the City of London,
Consulting Engineer, do hereby declare the nature of this invention to be as
follows:-
My improvements relate to making joints between the tubular parts of veloci-
pedes by frictional devices so as to dispense with brazing.
For this purpose, the extremities of the tubes are fitted with tight fitting coils
or helical springs of wire or sheet metal. If these coils be compressed they will
evidently expand against the tube and force can be applied to cause them to
expand the tube itself against a tight fitting lug or socket so as to ensure an
absolutely rigid joint. This compression can be applied either by a longitudinal
screw passed through the coil into washers or stops or by a cottar passing across
one end of the coil and through both lug and tube. The plates or stops may be
formed out of the same piece as the coils, and one of the tubes itself may form the
anchor or resistance piece on which the compression screw is dependent. Some-
times however the expansion is obtained by one or two wedges being screwed
through a gap in a liner; to obtain sufficient width and a guide for this wedge,
or these wedges, the edges of the gap are serrated or corrugated. To protect thin
outer lugs from being burst, I prefer to wrap them with a steel shell of conical
or other shape, or by a wrapping of fine steel wire.
Dated this 22nd day of November 1897.
I, PHILIP LOUIS RENOUF, of 19 & 20, Holborn Viaduct, in the City of London,
Consulting Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained in
and by the following statement:-
My improvements relate to making joints between the tubular parts of veloci-
pedes by frictional devices so as to dispense with brazing. For this purpose, the
extremities of the tubes are internally fitted with coils or helical springs of wire or
sheet metal which are expanded by compression, thereby expanding the tubes
against external sleeves or sockets.

page_text: :
"
Fig. I shews in section a T-piece "A", one branch of which "B" contains the
extremity of a tube "C": "D" is a coil of wire lying between the pressure
plates "E" & F" the latter are connected by the bolt "G" and nut or
nipple "H" it is evident that when "H" is tightened up, the coil will shorten
but at the same time increase in diameter, thereby exerting an enormous expan-
sive strain on tube "C" which in turn will expand till it fits tightly in the
branch "B". To prevent the latter from bursting, I sometimes strengthen it with
an external winding of fine wire; this in shewn in section at I, Fig. Ï.
Sometimes the expanding coil is made out of a tubular liner "K", such as is
shewn in Fig. II; one end "L" may be closed by a cap formed out of this same
piece and pierced to receive the compression bolt or nipple: this liner is turned or cut
helically so as to form a coil; the other end "M" may be closed similarly to the
end "L" or a separate resistance piece for the compression screw or nipple may
rest against it or be hooked in one or more holes or slots at "N." Joints made
as here described, having a certain amount of spring are strong and unlikely to
loosen or to break themselves or the tube or the socket under vibration.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is;
(1) A compressible coil or spring "F" Fig. I or "K" Fig. II, for the purpose
of expanding a tube "C" and thereby securing it into an external sleeve or
socket "B" substantially as described.
(2) The combination of a circumferentially expanding coil or spring with a com-
pressing bolt or screw or mechanical equivalent for the purpose and substantially
in the manner described.
(3) In tubes or tubular joints a helical liner "K" Fig. II substantially as
described:
33
"I Fig. I,
(4) On the socket or sleeve pieces of velocipedes a wound wire sleeve"
for the purpose of resisting expansion, as described.
.