Improvements in velocipedes
Year: 1895

page_text: Improvements in velocipedes
I HORACE WAITIP DOVIR, of The Dorman Engineering Company Mayor-
hold, Northampton, Engineer, do hereby declare the nature of this invention to be
as follows
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The
This invention relates to the construction of the frames of velocipedes of bamboo
in lieu of steel tubing, and it has for its object to avoid the liability to weakness at
the points where the greatest strength is required, viz at the joints, which is
nheient to the mode of construction at present adopted when using bimboo
present mode of fixing the ends of the bamboo in the sockets of the joints is by
turning down the ends truly cylindrical for a sufficient length to enter the socket
and cutting a screw thread on the turned part which screws into the internally
threaded socket against the end of which buts the shoulder in which the turned
part necessarily terminates
The object of my invention is to avoid the weakening of the bamboo caused by
the removal of the outer skin and by the reduction of diameter, and to this end I
bring the ends of the bamboo to the truly cylindrical form by moulding around the
ends a layer of plastic fibre cement, or imilar substance, which will set hard and
be caused to himly adhere to the skin of the bamboo This is applied by
moulding under pressure in mounds, the screw thread being at the same time
produced upon tl moulded surface by providing the moulds with an internally
threaded surf ice
Ihe moulds for pressing the fibrous cement on the two ends of the bamboo rod
are igidly coupled in true alignment so that the moulding of both ends will be
donc at the same time and in truc alignment, and when screwed home into the
sockets the joints it opposite ends will stand in correct relative position
Dated this 4th dx of Nov 1805
A M & WM CLARK
33, Chancery Lane London, Chartered Patent Agents
I, HORACF WAITFR DOVER of The Doiman Engineering Company, Mayor-
hold, Northampton, 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
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This invention relates to the construction of the frames of velocipedes of bamboo
In lieu of steel tubing and it has for its object to avoid the liability to weakness at
the points where the greatest strength is requied vz, at the Joint, which is
The
inherent to the mode of construction at present adopted when using bamboo
present mode of fixing the ends of the bamboo in the sockets of the joints is by
turning down the plugged ends truly cylindrical for a sufficient length to enter the
socket and cutting a screw thread on the turned part which screws into the

page_text: internally threaded socket against the end of which abuts the shoulder in which
the turned part necessarily terminates
The object of my invention is to avoid the weakening of the bamboo caused by
the removal of the outer kin and by the reduction of diameter and therefore
instead of removing the skin by turning down the ends I increase the diameter of
the ends of the bamboo and bring thein to a truly cylindrical form and also sciew
thread them by moulding around the plugged ends of the bamboo screw threaded
ferrules or bushings formed of plastic fibre similar to that known as vulcinized
fibre as used for steam packing and electric insulating purpo es except that a
glutinous material is preferably added to render it dhe ive so that when set hard
it will firmly adhere to the shin of the bamboo With the same object in view a
few small holes would be dulled in the bamboo as neat as possible to the extremities
so as to form a key for the plastic fibre, the bore of the bamboo being first plugged
in the u ual way This plastic fibre is applied by moulding under pressure in
moulds, the screw thread being at the same time produced upon the moulded
surface by providing the moulds with an internally threaded surface
I he moulds for pressing the fibrous cement on the two ends of the bamboo rod
endly coupled and truly aligned so that the moulding of both ends will be
done at the same time and in tinc lignment as though turned so that when scrowed
home into the sockets the Joints at oppos te ends will stand in correct relative
po ition
In the accompanying drawings I have illustrated in Figures 1 and 2 respectively,
section il fiont elevation and sectional end clevation of a pair of moulds that may
be adopted for the purpose eich composed of two half moulds A A¹ hinged
together as at a the bottom halves bein. rigidly coupled by a bir B The
cavities C of each half mould are semi-cylindrical and have screw thread cut in
them and are of an internal di meter exceeding that of the bamboo to afford pace
for the moulded fibie, the open ends of the civities hin_lip e adapted to
embrace the bamboo as closely as possible The operation of moulding and screw
threading the ferrules or bushings is performed by placing the plugged and side
drilled ends of the cut length of bamboo in the moulds as shown at the right hand
end of Figure 1, together with the requisite quantity of pla tic fibie, closing the
moulds and scuing them by means of hinged stirrup pieces D and pressure
screws or other means of forcibly closing the moulds which are left until the
moulded mitenal has set quite hand the excess squeeze out of the moulds buing
afterwards tummed off Io ensure charply moulded and threaded feule or
bu hings being turned out of the moulds the latter should if nece
uy be conted
with black lead or other parting material before being used for moulding the
plastic fibre
Having now piticularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed I declare that what I
claim is
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1 The heren described mode of trueing and screw threading the ends of length
of bamboo for bicycle frames, which consist in mouldin plastic fibrous miterial
such as described around the ends by means of sciew threaded moulds, subst intially
as pecified
2 The combination, with the lengths of bamboo forming the members of a
bicycle frame and with the screw sockets which they are received of screw-
threaded ferrules or bushings fumly adherent to the bamboo and formed thereon
by moulding the material in the plastic state in screw threaded moulds, substantially
as specified
Dated than 1th dan of 100c
A M & WM CLARK,
53, Chancery Lane, London, Chartered Patent Agents