Improvements in Locking Devices for Cycles
Year: 1894

page_text: Date of Application, 4th May, 1894
Complete Specification Left, 17th Dec., 1894-Accepted, 2nd Mar.,
1895
PROVISIONAL SPECIFICATION.
Improvements in Locking Devices for Cycles
1, FRANZ SAURBIER of Zülpicherstrasse, 35 Cologne, Germany, Secretary
State Railways, do hereby declare the nature of this invention to be as
follows:-
My invention has reference to improvements in locking devices fitted to bicycles
and tricycles. It consists of a device whereby such machines are locked and
released by means of a special key. The objects of such device is to prevent
the unauthorised movement of machines so fitted during the absence of the
owner.
To effect this object I extend the end of the front forks carrying the wheel, and
through these extended ends holes are bored parallel to the axle. Through one of
the holes a pin provided with a screw thread at one end is passed so that it can be
screwed into the hole in the opposite fork. The section of the head of the pin
may be of any suitable shape being fitted by a removable key for the purpose of
screwing the pin securely in its place. The hole through which the pin is passed
is provided with a ring, the internal diameter of which, is greater than that of the
key so that the latter easily fits into the ring when the pin is being screwed into
its place. The height of this ring is such that the head of the screwed pin cannot
be got hold of by means of pincers or the like. To further prevent unauthorised
persons from tampering with the locking device, a loose ferrule or tube is
introduced between the forks previous to passing the pin through it; the screwed
pin is thus completely surrounded and protected and prevents in any way the
unlocking of the machine.
If desirable my device may be fixed to the upper portion of the forks as near
the rim of the wheel as possible; this has the advantage that a much shorter pin
is only required. This device may also be fitted to the foot rests, the latter being
bored so as to allow the pin to be passed through them and fixed in the manner
hereinbefore described.
In the accompanying drawing
Fig. 1 is a side view of a front wheel and forks showing the position of my
locking device.
Fig. 2 represents on a larger scale the screwed pin, concentric protecting ring
and loose ferrule or tube, also the key for screwing or unscrewing the pin.
The following letters have reference to the various parts on the drawing. a is
the extended portion of the front forks b; c is the screw threaded pin fitted with a
suitable shaped head d; e is a protecting ring concentric with the hole bored in the
extension of the fork. This ring is made sufficiently deep to prevent any
tampering with the head of the pin e and is of larger diameter than the key fto
allow of the latter to be inserted for the purpose of operating the pin; g is the
protecting ferrule inserted between the forks. That portion of the fork where the
pin screws in, may be thickened as at h. for the purpose of obtaining a greater
number of threads and thereby increasing the security of the locking pin.

page_text: k shows in Fig. 1 another convenient place on the fork for fixing my device
and shows in dotted lines the position of a foot rest through which I
desirable insert a similar locking device.
may if
Dated this 4th day of May 1894.
JOHN P. O'DONNELL,
70 & 71, Palace Chambers, Westminster, S.W.,.
Agent for the said Applicant.
Improvements in Locking Devices for Cycles.
I, FRANZ SAURBIER of Zülpicherstrasse, 35, Cologne, Germany, Secretary,
State Railways, 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 reference to improvements in locking devices fitted to bicycles
and tricycles. It consists of a device whereby such machines are locked and
released by means of a special key. The objects of such device is to prevent the
unauthorised movement of machines so fitted during the absence of the owner.
To effect this object I extend the end of the front forks carrying the wheel, and
through these extended ends holes are bored parallel to the axle. Through one of
the holes a pin provided with a screw at one end is passed so that it can be screwed
into the hole in the opposite fork. The section of the head of the pin may be of
any suitable shape being fitted by a removable key for the purpose of screwing the
pin securely in its place. The hole through which the pin is passed is provided
with a ring the internal diameter of which, is greater than that of the key so that
the latter easily fits into the ring when the pin is being screwed into its place. The
height of this ring is such that the head of the screwed pin cannot be got hold of
by means of pincers or the like. To further prevent unauthorised persons from
tampering with the locking device, a loose ferrule or tube is introduced between the
forks previous to passing the pin through it; the screwed pin is thus completely:
surrounded and protected and prevents in any way the unlocking of the machine.
If desirable my device may be fixed to the upper portion of the forks as near
the rim of the wheel as possible; this has the advantage that a much shorter pin
is only required. This device may also be fitted to the foot rests, the latter being
bored so as to allow the pin to be passed through them and fixed in the manner
hereinbefore described.
In the accompanying drawing
Figure 1 is a side view of a front wheel and forks showing the position of my
locking device.
Figure 2 represents on a larger scale the screwed piu, concentric protecting ring
and loose ferrule or tube, also the key for screwing or unscrewing the pin.
Figures 3 to 10 show the application of my device to bicycles already in use
which are not provided with the necessary elongated forks for the insertion of the
locking pin.
Figures 3 and 4 are side views of two metal bands one of which clips round each
of the front forks of the machine; on Figure 3 is also shown an end view of a
special form of foot rest to be hereinafter further described.
Figure 5 is a side view of the foot rest referred to and shown in Figure 3, which
s so shaped as to form (when screwed into position through the fork as shown in
Figure 10) a guide for the insertion of the locking pin and also by being screwed
through the hole left in the side of the clip, hold the latter firmly in its position on
the fork.

page_text: Figure 6 is a view on top of the special foot rest showing the curved portion m
which serves as a guide when inserting the locking pin.
Figures 7 and 8 are views of two bands somewhat different to those shown in
Figures 3 and 4, it being intended that those in the latter figures should be slipped
onto the forks at their ends on removing the wheel. They would be held in
position by the foot rests being screwed through them.
Figure 9 shows the alternative arrangement described in Figures 3 to 8, fastened
to the forks of a machine with the locking piece in position through the wheel;
the special foot rest on one side and the ordinary one on the other hold the bands
firmly in position on the forks.
Figure 10 is a side view of the fork with the clip in position and an end view of
the special foot rest thereon, the curved portion m of the latter forms a guide
under cover of which the locking piece is inserted.
In Figures 1 and 2,-a is the extended portion of the front forks b, c is the
screw threaded pin fitted with a suitable shaped head d; is the protecting ring
concentric with the hole bored in the extension of the fork. This ring is made
sufficiently deep to prevent any tampering with the head of the pin c and is of
larger diameter than the key to allow of the latter being inserted for the purpose
of operating the pin; is the protecting ferrule inserted between the forks.
That portion of the fork where the pin screws in, may be thickened as at h for the
purpose of obtaining a greater number of screw threads and thereby increasing
the security of the locking pin. k shows in Figure 1 another convenient place on
the fork for fixing my device and 1 shows in dotted lines the position of a foot
rest through which I may if desirable insert a similar locking piece.
Having now particularly described and ascertained the nature of my said inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:-
An improved locking device for bicycles, tricycles and the like, a removable
centre pin and a separate key operating the same, the former passing between the
spokes for the purposes herein set forth and as illustrated in the accompanying
drawing.
T
1004
JOHN P. O'DONNELL,
70 & 71, Palace Chambers, Bridge Street, Westminster, London, S.W.,
Agent for the said Applicant.