Year: 1888

page_text: I, GEORGE DOUGLAS LEECHMAN of 17 Manor Park Road, Harlesden, in the county
of Middlesex, Manager of Works, do hereby declare the nature of this invention to be
as follows
My invention relates to an improved method of fixing the cranks of velocipedes to
the axles thereof, so that they may be readily and easily detached therefrom
Through the boss of the crank I form a transverse circular hole which intersects
the eye which receives the axle In the axle I cut or form a transverse slot of a
semicircular section This slot is cut of such a depth that when the crank is placed
on the axle the slot in it does not coincide with the circular hole in the boss of the
crank, that is the slot is not concentric with the hole I then take a round pin
and so flatten one side of it that it will pass through the hole in the crank
When
the
pin is in place, that is completely through the boss of the crank, it is turned
half round by means of a hexagon head which owing to the eccentricity of the
pin binds the crank firmly to the axle
As a modification one or both ends of the pin may be left round, and the centre
part made eccentric, so that greater facility for firmly securing the crank after wear,
may be obtained
To prevent the pin turning in the hole in the crank after adjustment, a small
set-screw may be made to impinge on the crank through the head of the pin, or on
the body of the pin through the crank, or the free end of the pin may be locked by
a lock nut, or expanded to bind it in the hole of the crank by an axial screw
ST1900
ROBT ED PHILLIPS, MIME,
Consulting Engineer and Patent Agent,
Royal Courts Chambers,
70, Chancery Lane, London, WC
Agent for the Applicant

page_text: Improvements in and relating to velocipedes
I, GEORGE DOUGLAS LFECHMAN, of 17 Minor Park Road, Harlesden, in the County
of Middlesex, Manager of Works, do hereby declare the nature of this invention ind
in what manner the same is to be performed, to be particularly described and
ascert uned in and by the following statement
My invention relates to in improved method of fixing the cranks of Velocipedes
to the les thereof so that they may be readily and easily detached therefrom
Through the boss of the crank Í form a transverse circular hole which intersects
the eye which receives the axle In the axle cut or form transverse slot of a
semicircul ir section This slot is cut of such a depth that when the crank is placed
on the male the slot in it does not coincide with the circular hole in the boss of the
crank that is the lot is not concentric with the hole I then take a round pin
and make it eccentric by forming a flat on one side of it, so that it will pass freely
through the hole in the crank When the pin is in place, that is completely
through the boss of the crink it is turned through a quarter of a circle by means of
a squire, hex igon or other shaped, head, when owing to the eccentricity of the pin,
the crank is firmly Jambed to the axle As a modification one or both ends of the
pin may be left round and the centre part made eccentric so that greiter facility for
firmly securing the crank after wear may be obtained
To prevent the pin turning in the hole in the cranh after adjustment, a small set
screw may be made to impinge on the body of the pin through the crank, or the head
may be prevented from turning by small screw, or the free end of the pin may
be locked by lock nut, or a screw may be threaded half into the crank and half
into the axle
In order that my invention may be fully understood I append a drawing hereto
illustrating it Figures 1, 2, and 3 tre views showing a crank on an axle, and the
transverse pin passed through the transverse hole ready to be turned, and, Figures 4, 5,
and 6 are views showing the ci ink locked to the tale by the transverse pin which
has been turned through a quarter of a circle Throughout these several views
similar parts are marked with like letters of reference
Referring to the Figures A designates the crank through the boss of which a
transverse circular hole a is cut or formed in such a position that it will cut through
the eye of the crink adapted to receive the axle B
In the axle B is cut or formed a semicircular slot b, the said slot being adapted to
coincide laterally with the hole a in the crank, but not being concentric therewith
C designates the transverse pin which is made eccentric by cutting a flat c on one
side of it, to adapt it to pass freely through the hole a and slot 6 When the pin C
is turned through a quarter of a circle it binds the crank firmly to the axle in a
manner that will apparent
If desired the pin C may be prevented from working loose by means of a set
screw c² arranged in any of the manners illustrated by Figures 4 and 5 of the
J

page_text: accompanying drawing It will be seen that by fixing the cranks to their axles in
the manner herein before described there is no necessity to drive the transverse pin
home, or to draw it up tight by a nut, as the transverse pin C passes freely through
the boss of the crank, when it is turned in one direction
I am aware that the cranks of Velocipedes have already been fixed to their axles
by transverse pins as set forth in Starleys Patent No 4478 of 1876, and I therefore
do not broadly claim the use of transverse pins, but
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what I
claim is
-
1st The method of fixing the cranks of Velocipedes to their axles as hereinbefore
set forth
2nd In a velocipede fixing the cranks to the axles carrying them by means of
eccentric pins, as set forth
3rd In a velocipede fixing a crank to the axle carrying it, by means of a transverse
eccentric pin capable of being passed freely through the boss of the crank and the
slot in the axle, and on being turned through a quarter or more of a circle, of binding
the crank to the axle, as set forth
4th In velocipedes fixing cranks to axles by rotating transverse eccentric pins
passing through the bosses of the said cranks and impinging on a flat or its equivalent
on the axle, as set forth
"
P
"
1000