Year: 1896

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 11 of the Patents, &c. Act, 1883) as required by
the decision of the Chief Examiner of the 4th day of August 1897.
JOHN GEORGE INSHAW Ivy Mount Gravelly Hill near Birmingham Mechani-
cal Engineer do hereby declare the nature of this invention to be as follows:-
Instead of turning, a recess in the chain driving wheel to admit the projecting
boss of the crank I cut a groove across the face of the chain driving wheel about
one sixteenth of an inch in depth and as wide as the diameter of the hole in the
centre of the said chain driving wheel; I also shape the boss of the said crank to
fit into the said groove in the said chain driving wheel; when the said crank is so
fitted to the said driving wheel, I drill two or more holes to admit screws or rivets,
which I use simply to join the said, crank to the said chain driving wheel, as no
propelling strain can come on the said screws or rivets, the said chain driving wheel
and crank being clutched together in the manner described.
Dated this 10th day of October 1896
JOHN GEORGE INSHAW.
I, JOHN GEORGE INSHAW of Ivy Mount Gravelly Hill, near Birmingham, in
the County of Warwick, Mechanical 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 has for its object to provide a more secure and firm connection of
the crank arm with the chain driving wheel than hitherto.,
I will describe my invention with reference to the accompanying drawing
Figure 1 being a side elevation of the chain wheel,
Figure 2 n inside elevation of the crank arm and
Figure 3 a section of the said chain wheel and crank arm fitted together.
Instead of merely turning a recess in the chain driving wheel A to admit the
projecting boss of the crank and depending upon pins to receive the strain I cut a
groove a across the bossa on the face of the chain driving wheel say about
one sixteenth of an inch in depth and as wide as the diameter of the hole a³ in the
centre of the said chain driving wheel; I also shape the boss 6 of the crank arm B

page_text: to fit into the said groove 2 in the said chain driving wheel A, that is to say, I
make its boss with recesses at the sides leaving a projection corresponding with
the groove in the boss of the chain wheel A. When the said crank arm is fitted
to the said chain driving wheel A as shewn in Figure 3 I drill two or more holes
(I have shewn three such holes at c) to admit screws or rivets which I use simply
to join the said crank arm to the said chain driving wheel, as no propelling strain
can come on the said screws or rivets; the said chain driving wheel and crank arm
being clutched together by the recess a2 and projection and the driving strain
received by the sides thereof.
It will be evident that the projection and groove may be reversed, that is.
the groove be in the boss of the crank arm and the projection on the chain
wheel if desired. The crank arms may be secured to the crank axle in the
usual way.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I wish it to be understood
that I am aware that it has been previously proposed to use an engaging groove
and projection 'in connecting the chain wheel to the crank arm of cycles, but I
declare that what I claim is:-
In cycles, the connection of the chain wheel to the crank arm by an engaging
groove and projection or clutch-like arrangement and screws or rivets as herein-
before described.
of War 1907
JOHNSONS & WILLCOX,
47 Lincoln's Inn Fields, London, W.C., Agents.