Year: 1898

page_text: I, WILLIAM HENRY CHAPMAN, of 5, Christie Road, South Hackney, London, E.,
Engineer, do hereby declare the nature of this invention to be as follows:-
The object of this invention is to enable the rear driving wheel of a bicycle of
the usual "safety" type to be removed from the machine without the necessity
of dismounting the driving chain and gear case.
According to my invention I ani enabled by merely withdrawing the central
spindle and unfastening a coupling, to remove the wheel along with one of its
bearings, the other bearing together with the sprocket wheel, driving chain, and
gear case being left in situ in the frame.
The means whereby this end is attained consist essentially in, first, constructing
the wheel hub in two portions normally coupled in driving connection by inter-
locking lugs and a union nut or other locking device but separable so as to permit
the end portion of the hub carrying the sprocket wheel and the one bearing to
remain in situ when the other or main portion of the hub to which the spokes are
attached is removed; secondly, securing the ball bearing cone at the sprocket
wheel end of the hub directly to the back fork end by a nut instead of, as usual,
to the central spindle, the latter merely screwing through the cone from without
up to an external abutment; thirdly, securing the cone of the other ball bearing
removably upon the central spindle by a nut which draws up the spindle tightly
in engagement with the cone and binds the cone against the back fork end, the
corresponding ball race or cup screwing adjustably into the hub, and a collar or
other means of retaining the cone in position in the cup being provided so that the
spindle may be withdrawn and the wheel dismounted without opening up the ball
bearing. By securing the central spindle as above described, all tendency either
to draw together or to separate the limbs of the frame is obviated.
In order to renew a spoke at the side next the sprocket wheel it is often neces-
sary to remove the latter from the hub, an operation of great difficulty when, as
generally happens, the sprocket wheel is screwed very tightly on its seat. The
separation of the two portions of the hub obviates this difficulty, as such separation
may be effected with much greater ease than the removal of the sprocket wheel
from its seat.
יד
1000
I, WILLIAM HENRY CHAPMAN, of 5, Christie Road, South Hackney, London, E.,
Engineer, do hereby declare the nature of this invention and in what manner the
[Price 8d.1

page_text: by a single adjustment and there is no tendency either to draw together or to
spring apart the limbs of the back fork whether in securing the spindle or in
adjusting the bearings, the cones (E) and (J) fixed to said limbs, being main-
tained at a constant distance apart upon the spindle (I).
A collar (2) is screwed on to the cone (J) so that when the spindle (I) is with-
drawn and the wheel disconnected, the cone (J) will be retained in its place within
the race and the balls will be prevented from falling out.
In order to renew a spoke at the side next the sprocket wheel it is often neces-
sary to remove the latter from the hub, an operation of great difficulty when, as
generally happens, the sprocket wheel is screwed very tightly on its seat. The
separation of the two portions of the hub obviates this difficulty.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is:
1. The driving wheel of a bicycle having its hub constructed of two parts
divisibly coupled in driving connection, the one part carrying the driving chain
sprocket wheel and containing the one ball bearing and the other part carrying
the remainder of the wheel so as to admit of the latter being removed from the
machine without dismounting the driving gear substantially as specified.
2. The driving wheel of a bicycle having its hub constructed of two parts
divisibly coupled in driving connection by interlocking means on the two parts of
the hub and a screw union nut or collar engaging a flange on the one part and a
screw thread on the other part, the one part carrying the driving chain sprocket
wheel and containing the one ball bearing and the other part carrying the
remainder of the wheel, so as to admit of the latter being removed from the
machine without dismounting the driving gear substantially as specified.
3. In a bicycle driving wheel whereof the hub is constructed of two parts
divisibly coupled in driving connection, the combination with the portion of the
hub upon which the chain driving wheel is mounted, of a ball bearing cone fixed
directly to and in the slot of the back fork end independently of the central spindle
substantially as specified, so as to support the part of the hub carrying the chain
wheel in position when the spindle is withdrawn and the wheel dismounted.
4. In a bicycle driving wheel whereof the hub is constructed of two parts
divisibly coupled in driving connection, the combination with the portion of the
hub upon which the chain driving wheel is mounted, of a ball bearing cone fixed
directly to and in the slot of the back fork end and of a central spindle passing
through and supporting the said cone under the load at the plane of the ball
bearing substantially as described.
5. In a bicycle driving wheel whereof the hub is constructed of two parts
divisibly coupled in driving connection, the combination with the main portion
of the hub to which the spokes are attached, of a ball bearing cone removably
mounted on the spindle and clamped directly to the back fork end by a nut on
the spindle, substantially as specified.
Dated this 15th day of June 189d.
A. M. & WM. CLARK,
Chartered Patent Agents, 53, Chancery Lane, London.