Improvements in Bicycles, Tricycles, and other Velocipedes.
Year: 1894

page_text: Date of Application, 19th Nov., 1894
Complete Specification Left, 2nd Aug., 1895-Accepted, 14th Sept., 1895
PROVISIONAL SPECIFICATION.
Improvements in Bicycles, Tricycles, and other Velocipedes.
We, HENRY CROMWELL FIELD, of the Firm of Alfred Field and Company of
Edmund Street, Birmingham in the County of Warwick, Merchants, and
ANDREW WILLIAM STOREY of "Sandown," College Road, Moseley, in the
County of Worcester Mechanical Engineer do hereby declare the nature of this
invention to be as follows:-
The said invention has reference to the method of connecting the cranks of
bicycles, tricycles and other velocipedes to the driving chain wheel and crank axle
and consists of the improvements hereinafter described by which a simple and
efficient attachment of the said parts is effected and the breadth of the tread of
the velocipede reduced to a minimum.
Instead of making the boss of the chain wheel concentric with the said wheel
and crank axle, we make the said boss eccentric thereto, that part of the said boss
of longest radius being in line with the crank to be attached. In that part of the
boss of shortest radius we make a semi-circular depression terminating in a slot
having a width equal to the diameter of the said semi-circular depression. We
make the head of the crank of a figure corresponding to that of the depression in
the boss of the chain wheel. The axial hole in the head of the crank and that in
the boss of the wheel are concentric with the wheel. We fix the crank in position
on the crank axle and to the boss of the wheel by means of a slightly taper cross
cotter or pin terminating in a screw. The said cotter has a flat made on its side
which flat fits against a similar flat on the crank axle. The head of the crank
being placed in the recess in the boss of the wheel, the cotter is passed into the
holes in the said boss and head of the crank. The screw nut being driven home on
the screwed end of the cotter the said cotter is drawn into the said hole and the
crank, crank axle and chain wheel firmly secured together.
Although we prefer to make the boss eccentric as described yet the said boss
may be made concentric in which case we provide projecting lugs or ears which
embrace that part of the crank adjoining its head, through which part and the
lugs described the taper cotter passes.
Dated this Nineteenth day of November 1894.
Improvements in Bicycles, Tricycles, and con
We, HENRY CROMWELL FIELD, of the Firm of Alfred Field and Company,
of Edmund Street, Birmingham in the County of Warwick, Merchants, and
ANDREW WILLIAM STOREY, of "Sandown," College Road, Moseley, in the
County of Worcester, Mechanical Engineer, do hereby declare the nature of the
said invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement :-
The said invention has reference to the method of connecting the cranks of
bicycles, tricycles and other velocipedes to the driving chain wheel and crank axle:
บา

page_text: and consists of the improvements herein after described by which a simple and
efficient attachment of the said parts is effected and the breadth of the tread of the
velocipede reduced to a minimum.
Instead of making the boss of the chain wheel concentric with the said wheel
and crank axle, we make the said boss eccentric thereto, that part of the said boss
of longest radius being in line, with the crank to be attached. In that part of the
boss of shortest radius we make a semi-circular depression terminating in a slot
having a width equal to the diameter of the said semi-circular depression. We
make the head of the crank of a figure corresponding to that of the depression in
the boss of the chain wheel. The axial hole in the head of the crank and that in
the boss of the wheel are concentric with the wheel. We fix the crank in position
on the crank axle and to the boss of the wheel by means of a cross-cotter or pin
terminating in a screw. The said cotter has a slightly taper flat made on its side
which flat fits against a similar flat on the crank axle. The head of the crank
being placed in the recess in the boss of the wheel, the cotter is passed into the
holes in the said boss and head of the crank. The screw nut being driven home
on the screwed end of the cotter the said cotter is drawn into the said holes and
the crank, crank axle and chain wheel firmly secured together.
Although we prefer to make the boss eccentric as described yet the said boss,
may be made concentric in which case we provide projecting lugs or ears which
embrace that part of the crank adjoining its bead, through which part and the
lugs described the cotter passes.
We will now describe with reference to the accompanying drawing the manner
in which the said invention is to be performed.
Figure 1 represents in front elevation and Figure 2 in section the crank of a
velocipede connected to the driving chain wheel and crank axle according to this
invention;
Figure 3 represents in front elevation and section, the driving chain wheel
detached and
Figure 4 represents the crank detached:
Figure 5 represents the screw ring for securing the head of the crank in the
boss of the chain wheel, before the connected parts are fixed on the crank axle ;
Figure 6 represents in front elevation and Figure 7 is side elevation, the boss of
the chain wheel drawn to a larger scale than Figures 1, 2 and 3.
The same letters of reference indicate the same parts in the several figures of the
drawing.
a is the chain wheel and the crank; c is the crank axle ; 'd is the eccentric boss
of the chain wheel having the form represented; that is, a portion of the said boss
is concentric with the hole e through which the crank axle c is passed, while the
other part is eccentric to the said 'hole, as best' seen in the enlarged' view Figure 6
and is in line with the crank b to be attached. The said boss d is recessed at f that
part of the recess in the boss of shortest radius being semi-circular, while the
other or extended part terminates in a slot or opening having a width equal to
the diameter of the said semi-circular portion of the depression (see the enlarged
view Figure 6). The head 62 of the crank b has a figure corresponding with the
depression in the eccentric boss d of the chain wheel (see the front view of
Figure 4) and is passed into the said depression by a sliding motion. It will be
seen that the axial hole 3 in the head of the crank and the hole e in the boss
of the chain wheel are concentric with the said wheel. In the opposite sides of
the eccentric portion of the boss d, are holes h, h and crossing the crank head is a
similar hole i through these coincident holes the pin or cotter k is passed for fixing
the crank and chain wheel to the crank axle.
In order to secure the head 2 of the crank in the boss d of the chain wheel
before fixing the connected parts to the crank axle c, the back of the crank head
has on it a tubular extension & partly screwed externally and an annular recess
is made in the face of the chain wheel, and concentric with the axial hole e in
the boss, for receiving the screw ring m (shown separately in Figure 5). 'When the

page_text: head 2 of the crank has been fitted in the recess fin the eccentric boss d of the
chain wheel a, the screwed end 6 of the said head projects into the annular recess !
and by screwing the separate ring m onto the projecting screwed end of the head
as represented in Figure 2, the crank head 2 is secured in the eccentric boss of
the chain wheel and the combined crank and chain wheel are ready to be fixed to
the crank axle c. This is effected by passing the axial hole 63 in the crank head
onto the end of the crank axle e and passing the pin or cotter k through the
coincident holes h h and i in the boss of the chain wheel and head of the crank and
against a cross recess in the crank axle and engaging the screw nut 2 on the
screwed end of the cotter. By driving home the screw nut upon the screwed end
of the cotter the said cotter is drawn into the said holes h, h, i and its taper flat
made to bear against the slightly taper flat in the crank axle, and the chain wheel
and crank are thereby secured to the crank axle as represented in Figures 1 and 2.
The flat on the side of the cotter and the corresponding flat in the crank axle are
best seen in Figure 2.
Figures 8, 9 and 10 represent the modification of the invention in which the
boss of the chain wheel is made concentric, the projecting ings or ears of the said boss
embracing the crank head: Figure 8 representing in front elevation and Figure 9.
in section the chain wheel and crank fastened to the crank axle and Figure 10-
representing the chain wheel boss with the crank removed, the said Figures 8, 9
and 10 being drawn to the same scale as Figures 6 and 7. In this modification, the
recess in the concentric boss of the chain wheel a is made conical and the head b
of the crank b is also made conical to fit the conical recess in the said boss d² (see
Figure 9), the said head 6 being provided with a shoulder 66 for bearing against
the shoulder d³ at the back of the slot in the boss. It will be seen that the sides
of the boss near the slotted part are prolonged and constitute projecting lugs or
ears which embrace the head of the crank, the cotter passing through the said
lugs or ears.
The head of the crank is secured in the boss and the crank and chain wheel are
fixed to the crank axle in the manner herein before described and corresponding
parts are marked with the same letters of reference.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed we declare that we claim
as the said invention ;-
First. The improvements herein before described and illustrated in Figures 1, 2,
3, 4, 6 and 7 of the accompanying drawing in connecting the cranks of bicycles,
tricycles and other velocipedes to the driving chain wheels and crank axles of the
said velocipedes, the said improvements consisting essentially in providing the
chain wheel with an eccentric boss of the kind described and illustrated and giving
to the head of the crank a figure suitable to fit in the depression in the eccentric
boss, the crank and chain wheel being fixed on the crank axle by a cross cotter or
pin passed through coincident holes in the head of the crank and eccentric boss
and made to bear against the crank axle substantially as described and illustrated.
Secondly. The modification herein before described and illustrated in Figures 8, 9
and 10 of the accompanying drawing in which the boss is concentric and is provided
with projecting lugs or ears for embracing the head of the crank and for receiving
the cotter or pin.
Thirdly. Securing the crank in position in the boss of the chain wheel by a flat
screw ring taking onto the screwed end of the crank head and fitting in an annular
recess in the face of the chain wheel as hereinbefore described and illustrated in
the accompanying drawing.
Dated this Thirty-first day of July 1895.
HENRY CROMWELL FIELD.
ANDREW WILLIAM STOREY.