An Improved Chain Sprocket with Friction Clutch and Brake for Cycles.
Year: 1898

page_text: Date of Application, 17th Dec., 1898
Complete Specification Left, 8th Feb., 1899-Accepted, 18th Mar., 1899
PROVISIONAL SPECIFICATION.
An Improved Chain Sprocket with Friction Clutch and Brake for
Cycles.
We, AXEL LUDWIG PETTERSSON and KARL JOHAN KARLQVIST, both of 21A, St.
Paulsgatan, Stockholm, in the Kingdom of Sweden, Mechanicians, do hereby
declare the nature of this invention to be as follows:-
This invention relates to such cycles as are provided with rotating pedals and
chain, and consists of a chain ring or sprocket on the back wheel which is so
constructed that it may be released from the hub whilst running, which has
the advantage of allowing the feet and pedals to remain stationary whilst the
cycle continues its forward movement, whilst the chain ring, or sprocket is also
so arranged that by a backward push on one of the pedals the cycle may be
braked by means of one or two brake blocks which engage round the rear hub
or a socket or casing mounted thereon.
The invention is shown in the accompanying drawings in which,
Figure 1 is a side view and Figure 2 a plan view in section on the lines a-b,
of Figure 1.
A ring 2 is firmly screwed on the hub 1 and on one side of said ring five
wedge shaped slots 3 are formed in which five balls 4 lie one in each slot or
recess. A chain ring or sprocket 5 formed of two sockets with flanges screwed
together rests on these balls. A collar 6 is also firmly screwed on the hub, or
sprung on to the same or made in one piece with it. A collar 7 is screwed
firmly on the ring 2. This collar is embraced by two brake plates 8 and 9
provided with oval holes 15, said plates being held together by means of pins 11
on which an ebonite roller 13 is mounted. A pin 10 above is made in one
piece with a hook 14 and an ebonite roller 12 is fixed on the pin 10. 16 is a
pin fixed in the outer brake plate 9 which pin extends under the right arm 17
of the rear fork. 18 is the left arm of the rear fork and 19 the axle of the back
wheel on which ball bearing cups 20 rotate when the back wheel revolves. This
axle is fixed in the two arms 17 and 18 of the rear fork. 21 is a link chain
and 22 indicates the hook 14 when it has dropped down between the rollers of
the chain.
In forward pedalling the balls 4 lving in the ball clutches, in consequence of
the friction against the inner side of the chain ring or sprocket 5, must follow
it for a moment until they remain sticking in the spherical slots or recesses 3
which gradually diminish in depth. This movement is also followed by the
ring 2 and consequently also the hub and the wheel.
If the chain be drawn in the opposite direction the balls 4 held between the
recesses 3 and the inner side of the chain ring or sprocket 5 are released. As
however the connection between the ring 2 and the chain ring or sprocket thereby
ceases, the hub and the ring continue to revolve whilst the chain sprocket is
stationary. By forcible back-pedalling, the hook 14 in consequence of the friction
of the ebonite roller 12 is thrown down against the chain so that the point is
TDi Q71

page_text: directed forwards and drops between two links of the chain, whilst it exerts a
pressure with its point against the other ebonite roller 13 fixed beneath.
In continuous backward pedalling the two brake plates 8 and 9 are pressed
backwards in consequence of the pressure of the chain against the hook, produc-
ing friction between said plates and the collars 6 and 7 fixed on the hub 1 and
ring 2, in consequence of the gradually diminishing width of the oval holes
formed in the brake plates. This friction may be increased or diminished by
greater or lesser pressure on the pedals. The pin 16 resting against the rear
fork serves to prevent the lower ebonite roller 13 bearing too strongly against.
the chain when the brake is applied.
Dated this 16th day of December 1898.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicants.
An Improved Chain Sprocket with Friction Clutch and Brake for
Cycles.
We, AXEL LUDWIG PETTERSSON and KARL JOHAN KARLQVIST, both of 21A, St.
Paulsgatan, Stockholm, in the Kingdom of Sweden, Mechanicians, do hereby
declare the nature of this invention and in what manner the same is to be por-
formed, to be particularly described and ascertained in and by the following
statement:
This invention relates to such cycles as are provided with rotating pedals and
chain, and consists of a chain ring or sprocket on the back wheel which is so
constructed that it may be released from the hub whilst running, which has
the advantage of allowing the feet and pedals to remain stationary whilst the
cycle continues its forward movement, whilst the chain ring or sprocket is also
so arranged that by a backward push on one of the pedals the cycle may be
braked by means of one or two brake blocks which engage round the rear hub
or a socket or casing mounted thereon.
The invention is shown in the drawings accompanying the Provisional
Specification in which,
Figure 1 is a side view and Figure 2 a plan view in section on the lines a-b,
b-c of Figure 1.
A ring 2 is firmly screwed on the hub 1 and on one side of said ring five
wedge shaped slots 3 are formed in which five balls 4 lie one in each slot or
recess. A chain ring or sprocket 5 formed of two sockets with flanges screwed
together rests on these balls. A collar is also firmly screwed on the hub, or
sprung on to the same or made in one piece with it. A collar 7 is screwed
firmly on the ring 2. These collars are embraced by two brake plates 8 and 9
provided with oval holes 15, said plates being held together by means of pin 11
on which an ebonite roller 13 is mounted. A pin 10 above is made in one
piece with a hook 14 and an ebonite roller 12 is fixed on the pin 10. 16 is a
pin fixed in the outer brake plate 9, which pin extends under the right arm 17
of the rear fork. 18 is the left arm of the rear fork and 19 the axle of the back
wheel on which ball bearing cups 20 rotate when the hack wheel revolves. This
axle is fixed in the two arms 17 and 18 of the rear fork. 21 is a link chain
and 22 indicates the hook 14 when it has dropped down between the rollers of
the chain.
In forward pedalling the balls 4 lying in the ball clutches, in consequence of

page_text: the friction against the inner side of the chain ring or sprocket 5, must follow
it for a moment until they remain sticking in the spherical slots or recesses 3
which gradually diminish in depth. This movement is also followed by the
ring 2 and consequently also the hub and the wheel.
If the chain be drawn in the opposite direction the balls 4 held between the
recesses 3 and the inner side of the chain ring or sprocket 5 are released. As
however the connection between the ring 2 and the chain ring or sprocket thereby
ceases, the hub and the ring continue to revolve whilst the chain sprocket is
stationary. By forcible back-pedalling, the hook 14 in consequence of the friction
of the ebonite roller 12 is thrown down against the chain so that the point is
directed forwards and drops between two links of the chain, whilst it exerts a
pressure with its point against the other ebonite roller 13 fixed beneath.
In continuous backward pedalling the two brake plates 8 and 9 are pressed
backwards in consequence of the pressure of the chain against the hook, produc-
ing friction between said plates and the collars 6 and 7 fixed on the hub 1 and
ring 2, in consequence of the gradually diminishing width of the oval holes
formed in the brake plates. This friction may be increased or diminished by
greater or lesser pressure on the pedals. The pin 16 resting against the rear
fork serves to prevent the lower ebonite roller 13 bearing too strongly against
the chain when the brake is applied.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. A chain sprocket with friction clutch and brake for cycles with chain driv-
ing gear, characterised by the arrangement of a ball clutch adapted partly to
lock the hollow chain ring or sprocket against a ring fixed on the wheel hub
and located inside the sprocket and partly to carry the sprocket, and by two
brake plates provided with oval holes being arranged to bear against collars
mounted on the hub and inserted in said holes, substantially as hereinbefore
described.
2. A form of construction of the chain sprocket hereinbefore described, con-
sisting in a hook (14) being pivotally mounted on the brake plates (8 and 9) and
adapted when the chain is drawn backward to drop between the links of same
and press the brake plates (8 and 9) against the collars (6 and 7) so that the
wheel hub and thereby the whole wheel is braked, substantially as hereinbefore
described.
Dotad this 711 .
000
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Agents for the Applicants.