Improvements in Bicycles or other Velocipedes and such like Carriages.
Year: 1891

page_text: Date of Application, 29th Oct., 1891
Complete Specification Left, 30th Nov., 1891-Accepted, 2nd Jan., 1892
PROVISIONAL SPECIFICATION.
Improvements in Bicycles or other Velocipedes and such like
Carriages.
I THOMAS LEIGH MITCHELMORE of 31 Derby Road, Nichols Town,
Southampton, in the County of Hampshire, Engineer, do hereby declare the nature
of this invention to be as follows:-
My invention relates to bicycles or other velocipedes, and such like carriages,
more especially to the cranks of same, and comprises various improvements herein-
after described.
The main object of my said invention is to provide cranks of improved form that
can be readily and securely adjusted upon the axle ends.
According to one form or modification of my invention I provide upon the crank
boss two lugs, on one side of same,-standing at right angles to the length of
crank and situated in a line with the centre of the eye of boss, the boss of my
cranks is therefore a split one, a small space being left between the connecting luga,
the form of the opening or eye in the boss which fits over the axle is according to
one modification of my invention, crescental, such shape being given to it by reason
of a convex projection being formed within the otherwise circular shaped eye, the
axle ends must consequently be under the circumstances of crescental form in cross
section where embraced by the boss. But I do not limit myself to this particular
form of eye I may provide if preferred a triangular, rectangular, or any other shaped
projection or projections in the eye of boss, and a correspondingly shaped slot, or
slots in the axle ends, in which the said projection, or projections in the eye of boss
would fit when the cranks are passed on to the axle.
A screw bolt or set screw is fitted in, and passes through one of the boss lugs
into the other, or through both lugs; after the crank is passed on to the axle end,
the screw is tightened up thereby bringing the lugs together, whereby the boss is
made to firmly grip the axle.
The crank cannot turn upon the axle as it is held in position by means of the
projection, or projections-formed within the eye of boss-fitting closely in the
corresponding slot or slots in the axle, and the strains due to the revolutions of
the crank are taken almost entirely by the projection, or projections-acting as a
key and not by the bolt or set screw, the principal work of which is to secure the
cranks upon the axle.
As a further security against the crank coming off the axle ends, I may sometimes
arrange for the bolt or set screw, which connects the lugs of the boss, to project
slightly into the eye of the latter and consequently into a corresponding slot
provided in the axle, in this arrangement, the cranks could not be taken off the
axle ends until the bolt or set screw is almost entirely withdrawn from the boss
lugs, but in the first-hereinbefore described-arrangement it is only necessary to
slacken the bolt or set screw to allow of the removal of the cranks from the
axle ends.
A crank boss made according to my invention is not weakened by a key hole as
none is required.
1
FOLL 1
1001

page_text: COMPLETE SPECIFICATION.
Improvements in Bicycles or other Velocipedes and such like
Carriages.
I THOMAS LEIGH MITCHELMORE, of 31 Derby Road, Nichols Town,
Southampton, in the County of Hampshire, 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 invention relates to bicycles, or other velocipedes, and such like carriages,
more especially to the cranks of same, and comprises various improvements herein-
after described.
The main object of my said invention, is to provide cranks of improved form
that can be readily and securely adjusted upon, and afterwards as easily removed,
at will, from the axle end.
In the accompanying drawing
Fig. 1, is an elevation, partly in section, of a crank, B, constructed according to
my invention.
Fig. 2, is an elevation taken at right angles to Fig. 1.
Figs. 3, and 4, 5, and 6, respectively are views similarly taken as Figs. 1, and 2,
but illustrating modifications of my invention.
According to my invention I make my cranks B with two lugs b, b',-situated
upon either side as preferred of the boss A, and forming part of same-leaving a
small space c, between the lugs, and upon the inside of the eye of boss, and forming
part of same, I provide a solid projection d, (see Figs. 1, and 2, and 5, and 6,)
which may be of shape as shewn, or of triangular, rectangular, or any other form
convenient for the purpose for which provided. I may sometimes make the boss
eye with more than one such projection d, and I may arrange for the projection, or
projections, to be in position on the inside of eye, other than as shewn at d, (see
Figs. 1, and 5,) but whatever the shape, number, and position, of the projections d,
within the eye of boss, correspondingly shaped slots, or recesses d', will be provided
in the axle ends in which the said projection, or projections, d, will fit when the
crank is passed over the axle end i.
A screw bolt f, passes loosely through one of the lugs b, b¹, and is screwed into
the other; After the crank is passed over the axle end it is only necessary to
tighten up the bolt f, to bring the two lugs somewhat together, whereby the crank
boss is made to firmly embrace the axle end; A nut f, may be screwed on the
point of bolt if preferred.
It is evident that by reason of the projection, or projections d, engaging with
the recess, or recesses, in the axle ends, the crank is thus prevented from turning
upon the axle.
Instead of providing the projection, or projections, d,– -or such like solid fixed
projections within the eye of boss, I may sometimes adopt-in combination with
that part of my invention included in the lugs b, b', and setting up screw f-the
known method of screwing, or driving a pin, or pins g, lengthways into the crank
boss, and axle end as illustrated at Figs. 3, and 4, these pins obviously doing the
same duty as that performed by the projections d.
As a further security against the cranks coming off, the axle ends I may some
times arrange for the bolt f to project slightly into the eye e of the crank (see
Fig. 5,) a slot or recess being provided in the axle end to receive this part of the
bolt, and further I may also sometimes arrange for the head of the bolt f, to project
into the eye of boss as shewn, a recess h being provided in the axle end to take this
part of the bolt head, the latter would then assist in preventing the crank turning
upon the axle, in this arrangement the projection d, will probably be in any position
within the eye of boss, other than as shewn at Figs. 1, and 2; or it may be
convenient under this arrangement to entirely do away with the projections d, or
pins g.

page_text: 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 :-
1st. Velocipede cranks, constructed, and arranged substantially in manner as
hereinbefore described and illustrated in the accompanying drawing.
2nd. The construction of a velocipede crank, with two lugs b, 4, and fitting a
screw f, in same for the purpose specified, the lugs forming part of, and being
situated on one, that is either-side of the boss of the crank, in position and
arranged substantially in manner as hereinbefore described and illustrated in the
accompanying drawing.
3rd. In a velocipede, the method of attaching the cranks to the axle ends by
causing the screw f, to engage with the lugs b, b', substantially in manner as
hereinbefore described.
4th. In a velocipede crank the solid fixed projection, or projections d,
―or similar
thereto within the eye of boss and forming part of the boss, as and for the purpose
specified.
5th. In a velocipede the method-in combination with the parts of my invention
hereinbefore described and claimed-of securing the crank, upon the axle, and
preventing its turning upon same by arranging for the head of the bolt f, to project
into the eye of boss and into a recess h, provided for the purpose in the axle end i,
in manner substantially as described, and shewn with reference to Figs. 5, and 6, of
the accompanying drawing.
Dated this 28th day of November 1891.
HERBERT P. BLAKE, M.I.N.A.,
70, High Street, Southampton, Agent for the Applicant.