Improvements in or relating to the Rear Fork Ends of Cycles.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in or relating to the Rear Fork Ends of Cycles.
I, GEORGE LAMB, of 81, Somerville Drive, Mount Florida, in the City of
Glasgow, Manufacturer, do hereby declare the nature of this invention to be as
follows:-
This invention which relates to cycles has for its object to provide simple means
whereby the chain driven wheel may be readily removed from its place in the
back stay of the cycle frame and replaced therein so as to run true whilst also
ensuring that it may not be thrown out of true running in slackening or tighten-
ing up the chain.
To that end the fork or gap formed at the rear end of each tube of the back
stay of the cycle frame is closed at the rear end and the lower limb or member
is jointed to the other so that it may open down to permit of the removal or
replacing of the wheel hub or spindle. The upper face of this jointed limb is
formed with notches or ratchet teeth into which, when the fork is closed, the
angled edge of a nut on each end of the spindle adapted to rest. The ratchet
teeth on the forks on both sides of the wheel are made alike, and when the nut
on the wheel spindle is dropped into any given notch or tooth on one side the
nut on the opposite side is placed into the corresponding notch when closing up
the forked gaps of the stays. The wheel is by this means retained in its true
position and is not liable to be set at an angle or twisted by the strain of the
chain. The jointed and notched limbs of the back stay may be secured in the
closed up position by means of screws or equivalent devices which are readily
withdrawn for opening up the gap to remove the wheel.
In a modification the forked or gap pieces which receive the spindle of the
driven wheel hub are altogether detachable from the back stays of the cycle
frame and are made to telescope therein, one edge of each gap piece being formed
with notches or ratchet teeth which may engage with corresponding teeth or
catches in the back stay tubes and which serve as guides in placing the wheel
in position to run true.
In a further modification applicable to the frames of existing cycles a bar or
strip notched on its upper edge for the reception of a nut on each end of the
wheel spindle is fitted on the side of the lower fork or gap of each back stay so that
the notches or teeth project above the lower edge of the gap. These bars or strips
are jointed to the stay so that they may be swung downwards free of the nuts on
the wheel spindle when the wheel is to be removed.
100x

page_text: 2540
I, GEORGE LAMB, of 81, Somerville Drive, Mount Florida, in the City of
Glasgow, Manufacturer, do hereby declare the nature of this invention. and in
what manner the same is to be performed, to be particularly described and ascer-
tained in and by the following statement:-
This invention which relates to cycles has for its object to provide simple means
whereby the chain driven wheel may be readily removed from its place in the
back stay of the cycle frame and replaced therein so as to run true whilst also
securing that it may not be thrown out of true running in slackening or tighten-
ing up the chain.
The invention is illustrated by the accompanying drawings, Figure 1 being an
elevation of part of the back stay shewing the improved method of constructing
the fork and shewing the spindle of the rear wheel in position therein. Figure 2
is a similar view but shewing the fork in open position so that the rear wheel
may be removed. Figures 3 and 4 are views corresponding to Figure 1 of modified
forms of the invention.
The fork or gap A, A, formed at the rear end of each tube of the back stay B
of the cycle frame is closed at the rear end as shewn at Figure 1, and the lower
limb or member A' is jointed to the other A so that it may open down to permit
of the removal or replacing of the wheel hub or spindle C. The upper face of
this jointed limb A¹ or the adjacent faces of both limbs is or are formed as shewn
with notches or ratchet teeth A2 into which, when the fork is closed, the angled
edge of a nut D or projections 11 on said nut on each end of the spindle C is
adapted to rest. The ratchet teeth A2 on the limbs A, A', on both sides of the
wheel are made alike, and when the nut D on the wheel spindle C is dropped
into any given notch or tooth on one side the nut D on the opposite side is placed
into the corresponding notch when closing up the forked gaps A, A', of the stays B.
The wheel is by this means retained in its true position and is not liable to be
set at an angle or twisted by the strain of the chain. The jointed and notched
limbs A, A, of the back stay B may be secured in the closed up position by
means of screws E or equivalent devices which are readily withdrawn for open-
ing up the gap to remove the wheel.
In a modification illustrated at Figure 3 the forked or gap pieces A, A', which
receive the spindle C of the driven wheel hub are altogether detachable from the
back stays of the cycle frame and are made to telescope therein, as shewn, one
edge of the gap piece A, A', being formed with notches or ratchet teeth A³ which
may engage with corresponding teeth or catches A* formed on a portion of the
back stay tubes and which serve as guides in placing the wheel and secure it in
position to run true.
In order to insert this detachable portion in the back stay tube the piece is so
turned as to clear the teeth upon the inside of the tube and after the detachable
piece has been inserted the desired length it is turned so as to engage the teeth
on the back stay tube. A set screw B may be provided for preventing turning
of the piece within the tube.
In a further modification illustrated at Figure 4 applicable to the frames of
existing cycles a bar or strip F notched on its upper edge at F1 for the reception
of a nut D or projections on a nut on each end of the wheel spindle G is fitted on
the side of the lower fork or gap H of each back stay B so that the notches or
teeth F project above the lower edge of the gap H. These bars or strips F are
.

page_text: jointed to the stay B so that they may be swung downwards free of the nuts on
the wheel spindle when the wheel is to be removed.
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:-
In a cycle the improved construction of the fork or gap upon the back stay
to permit of the ready removal or replacing and adjustment of the rear wheel
consisting in hinging together at the rear end the limbs of said fork, and provid-
ing upon the faces thereof or on the inner face of either limb a series of notches
or ratchet teeth adapted to engage with the angled edges of a nut at each end of
the wheel spindle substantially as described.
WALLACE FAIRWEATHER,
Of the Firm of Cruikshank & Fairweather, Chartered Patent Agents,
62, Saint Vincent Street, Glasgow, Agent for the Applicant.