Improvements in the Construction of Cast Cycle Forks, Frames, and like Articles.
Year: 1897

page_text: Date of Application, 19th May, 1897
Complete Specification Left, 25th Jan., 1898-Accepted, 26th Mar., 1898
PROVISIONAL SPECIFICATION.
Improvements in the Construction of Cast Cycle Forks, Frames,
and like Articles.
We, JAMES GEORGE ACCLES, of Perry Barr, Birmingham, in the County of
Warwick, Engineer, and THE LU-MI-NUM MANUFACTURING COMPANY, LIMITED,
of 75, Queen Victoria Street, in the City of London, do hereby declare the nature
of this invention to be as follows:-
This invention relates to certain improvements in the construction of cycle forks,
frames, and like articles, such as the frame work of vehicles, where cast in
aluminium alloys in metal moulds.
The invention consists in placing in the mould in which the casting takes place
at any suitable or desired point steel or other suitable metal bushes or tubes to
give increased strength or rigidity to the said forks, frames, or parts.
The above tubes or bushes when placed in the desired position in the mould,
preferably in the case of cycles, at the bottom bracket of the frame, and at the
crown of the fork, are then heated with the mould to the required heat, and the
molten aluminium alloy being poured into the mould either completely or in part,
as desired, covers the tubes or bushes, the said tube being provided with holes, slots,
corrugations, or projections as required, a perfect connection is formed between
the tubes or bushes and the aluminium alloy forming the fork or frame.
The aforesaid tubes or bushes where desired may be split, and the split portions
of the tubes bent into any required shape; in the case of the fork mould the said
portion may be carried through the shoulders of the fork and part way down the
blades, giving increased connection with the alloy and extra rigidity to the fork.
The tubes or bushes are also inserted screwed where required to receive bearing
cups, cones, locking nuts, and any other parts where a screw thread is necessary
or desirable.
1007
Improvements in the Construction of Cast Cycle Forks, Frames,
and like Articles.
We, JAMES GEORGE ACCLES, of Perry Barr, Birmingham, in the County of
Warwick, Engineer, and THE LU-MI-NUM MANUFACTURING COMPANY, LIMITED,
[Price 8d.]

page_text: of 75, Queen Victoria Street, in the City of London, do hereby declare the nature
of this invention and in what manner the same is to be performed, to be particu-
larly described and ascertained in and by the following statement:-
This invention relates to certain improvements in the construction of cycle
forks, frames and the like where cast in aluminium or other suitable alloys or light
metals in metal moulds.
The invention consists in strengthening or stiffening the parts such as the cycle
frame illustrated in the accompanying drawing by inserting therein during the
process of casting steel or hard metal strips tubes bushes or stiffening pieces
particularly at the parts forming bends or joints of the frame, the object being to
give increased strength or rigidity to the parts.
In the accompanying drawing are illustrated two parts of a cycle frame stiffened
according to the invention.
to
Fig. 1 is a front elevation of a front wheel fork of a cycle constructed according
my invention.
Fig. 2 is a side elevation.
Fig. 3 is a cross section on a smaller scale of the bottom bracket of a cycle
frame and
Fig. 4 is a cross section of same at right angles thereto.
In carrying out the invention the steel strips tubes bushes or stiffening pieces ard
placed in the desired position in the mould (and supported by the cores or other-
wise) and are heated with the mould to the required heat and the molten aluminium
alloy being poured into the mould either completely or in part as desired cover
the strips tubes bushes or stiffening pieces so that they form a solid whole with the
alloy of the frame.
In Fig. 1 a represents a steel tube which is provided at one end with bent
stiffening pieces tongues or extensions bb preferably formed by slitting the tube
These
and bending and cutting the pieces so formed into the desired shape.
tongues are enclosed by the aluminium alloy c forming the fork in such a way
that the shoulders of said fork are stiffened and supported.
The upper part of the tube a passes through the head post of the frame (not
shown) in which it is free to turn and may be provided with a split end in which
is inserted the ordinary socket of the handle bar a nut & serving to secure the latter.
in place in the usual way.
In Figs. 3 and 4 a stamped metal bush or tube e having socket pieces el projecting
therefrom and formed therewith is held in the bottom bracket by the alloy c¹
forming the cast frame being partly run around it.
The parts e el are supported in the mould during casting by the cores which are
placed inside same, such cores being subsequently withdrawn leaving the parts as
shown. The stay piece f which is usually solid in this form of frame may have a
stiffening piece or tongue entering same if desired.
The tubes bushes or strengthening pieces may be provided with holes, slots,
corrugations or projections if required so that a more perfect connection may be
secured between them and the aluminium alloy forming the fork or frame.
The tube e forms a lining for the bracket c¹ and may be internally screwed if
desired and is preferably so formed in order that the bearings may be attached
directly thereto and it may be extended beyond the alloy and externally screwed so
that locking nuts bearing cups cones and other parts may be attached directly
thereto.
Having now particularly described and ascertained the nature of the said in-
vention and in what manner the same is to be performed we declare that what
we claim is:
-
1. In a cast cycle frame or like article of alloy or light metal, a hard metal
suffening piece enclosed or included in the body of the alloy or light metal at a
bend or joint of same for the purpose of stiffening the part substantially as

page_text: 2. In a cast fork for a cycle of alloy or light metal the combination with same of
a hard metal tube provided with tongues or extensions which are enclosed or
included in the body of the fork at the shoulders of same substantially as described.
3. In a cast cycle frame of alloy or light metal the combination with the bottom
bracket of a hard metal tube having socket pieces projecting therefrom such tube
and socket pieces being surrounded by the alloy so that they form a lining for
same substantially as described.
4. In a cast cycle frame of alloy or light metal the combination with the bottom
bracket of a hard metal screwed tube having socket pieces projecting therefrom
such tube and socket pieces being surrounded by the alloy so that they form a
lining for same and the screwed tube being adapted to receive the bearings sub-
stantially as described.
11
011 1
T
1007
PHILIP M. JUSTICE,
55 and 56, Chancery Lane, London, Chartered Patent Agent.
For the Applicants.