Year: 1896

page_text: Date of Application, 22nd May, 1906
Complete Specification Left, 25th July, 1896-Accepted, 3rd Oct., 1896
Complete Specification Left, 25th July, 1896-Accepted, 3rd Oct., 1896
I, CHARLES FREDERICK SHUCKBURGH WRIGHT, of Nanuerch near Mold in
the County of Flint, Gentleman, do hereby declare the nature of this invention
to be as follows:-
My invention has for its object a cycle lock to afford cyclists a ready means of
securing their machines against theft or from being ridden by others when
temporarily left alone, and more particularly to provide a lock for use as a fixture
on the machine thus obviating the inconvenience of the ordinary padlock which
has to be carried in the pocket or saddle bag when not in use.
The invention consists essentially in securely attaching as a fixture in any
suitable manner to the frame of the machine preferably at the rear of the sprocket
or chain wheel an ordinary bolt lock so adapted that its bolt, when shot by means
of a key, shall engage the teeth of the sprocket and securely lock the latter
against rotation.
In carrying out the invention I prefer to attach the lock to the tube which runs
from the pedal shaft to the rear driving wheel, by means of a split collar or metal
straps or extensions on the lock plate adapted to embrace the tube of any machine
the ends being rivetted together when the lock is in position, the lock being so
placed that its bolt when shot shall engage the teeth of the sprocket preferably
radially. The lock bolt may be formed to engage between the teeth, but I prefer
to cut or form its end to engage over one tooth, and in order to frustrate any
attempt at forcing the lock I form its plates or cheeks of sufficient length to cover
the bolt when shot, leaving sufficient room however for the sprocket teeth to run
between the cheeks, when unlocked.
As in some machines there will be found very little room for the lock at the
rear of the sprocket, owing to the bend of the tube and to the sprocket being set
close in, I prefer in such cases to cut away the back of the lock to reduce its
length and reduce the back of the bolt to the form of a pin to work freely into a
hole which I provide for it in the tube. This allows free play to the bolt.
To secure a good attachment of the lock to the frame tube, I prefer to dish or
form the face of one of the lock plates to the contour of the tube, and this will
be found particularly desirable when placing the lock on the bend of the tube.
My invention is more particularly applicable to bicycles but it may obviously
be equally well applied to other cycles.
Whilst I have described one way of carrying out the invention, I do not confine
myself to the exact form described, as various modifications may be adopted
without departing from the spirit of the invention; for instance the lock may be
placed on any part of the framing where it could engage the sprocket teeth, and
its bolt need not engage the teeth radially, the cheek extension on the lock may
also take the form of special plates applied thereto.
Dated this 21st day of May 1896.
WM. P. THOMPSON & Co.,
Of 6, Lord Street, Liverpool, Patent Agents for the Applicant.

page_text: I, CHARLES FREDERICK SHUCKBURGH WRIGHT of Nannerch near Mold in
the County of Flint, Gentleman 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 for its object a cycle lock to afford cyclists a ready means of
securing their machines against theft or from being ridden by others when
temporarily left alone, and more particularly to provide a lock for use as a fixture
on the machine, thus obviating the inconvenience of the ordinary padlock which
bas to be carried in the pocket or saddle bag when not in use.
The invention consists essentially in securely attaching as a fixture, in any
suitable manner to the frame of the machine, preferably at the rear of the sprocket
or chain wheel, an ordinary bolt lock so adapted that its bolt, when shot by means
of a key, shall engage the teeth of the sprocket and securely lock the latter
against rotation.
I will now describe the invention with reference to a bolt-lock well adapted to
attain the object of the invention, the wards and tumblers being replaced by
locking pins and which is shown in the accompanying drawings in which :-
Figure 1 is a side elevation of a bicycle to which my invention is applied.
Figures 2 and 3 are side and end elevations respectively of one form of bolt-
lock adapted to the end in view.
Figures 4 and 5 are vertical longitudinal sections of the same showing the bolt
in its outermost and innermost positions respectively and the method of engaging
the sprocket.
Figure 6 is a sectional plan view of same showing the bolt half shot.
Figures 7 and 8 show bottom plans of the bolt with the casing removed, the
key block being removed in Figure 7.
Figures 9 and 10 are transverse sections of the bolt-lock showing the action of
the key in operating the locking pins.
A cylindrical lock case in the form of a tube A is attached rigidly to a part of
the machine frame near the sprocket, preferably the bottom fork by means of split
collars or clips B or in other suitable manner. Within this case is the bolt C of
cylindrical form to fit the case and move freely therein and having its end grooved
at C¹ to engage two teeth of the sprocket as shown in Figure 4. Said bolt is cut
away or flattened for a portion of its length above and below to receive within
the case a stop D and a key block E (Figures 4 and 5). The stop D is held
against movement within the case by means of a rivet or screw a or in like manner
and serves to limit the throw of the bolt outward as in Figure 4, and inward as
in Figure 5. The key block E is screwed or riveted to the bolt C so as to move
with the latter and the case A is slotted to allow access of a key to the key block
which latter works within the said slot as the bolt is shot.
A key hole is formed as a groove e in the key-block E and immediately over
this groove a series of perforations (three are shown in the drawing) are made
through the flattened shank of the bolt C (Fig. 7). Two further series of
perforations 9 and h of similar bore and number to the perforations are made in
the stop D (Figure 6) one series at each eud, the perforations f registering with
one or other of these series when the bolt is in its inward or outward position.
Pins fg and h' are placed loosely in the perforations f g and h respectively
(Figures 4 and 5), the pins f being retained against dropping into the key
groove e by making the width of the latter rather less than the diameter of the

page_text: perforations. When in their lowermost position these pins f' do not extend to
the top of their perforations but leave room for the pins gl or h¹ to follow them.
downwards into said perforations.
To operate this bolt-lock assuming the cycle to be locked as shown in Figure 4,.
a key G (Figure 9) having its upper edge stepped towards one end is inserted in
the key groove e thereby raising the pins f and h¹ from the position shown in
Figures 4 and 10 to the position shown in Figure 9, so that the upper ends of
the pins and the lower ends of the pins all lie flush with the upper face-
of the flattened shank of the bolt C and the latter is then shot back by pushing
the bolt and key to the left. The pins now register with the pins g¹ (Figure 5).
and on the key being withdrawn the pins f¹ drop into their lowermost position
in their perforations and are followed by the pins g' which thus partly enter said:
perforations and hold the bolt securely locked in its inward position (Figure 5).
f
To lock the cycle the mode of operation is similar, the key being inserted to
raise the pins, then pushed to the right to shoot the bolt and finally withdrawn
to allow the pins and to drop a little and thus lock the bolt in its outward
position in which it engages the teeth of the sprocket (Figure 4).
In order to prevent the cycle being unlocked by an unauthorised person, such
as by the use of the key of another cycle, I make the key G with its edge
stepped to different heights for each of the pins f¹ and make the latter each of
different lengths to correspond to their respective step. The keye and pins of
different machines will be differently proportioned and security will thus be
obtained, as without the proper key for a given machine the pins cannot all be
raised with their ends all flush with the top of the bolt and the latter cannot
thus be unlocked. The bottom face of the bolt is grooved at e¹ (Figure 10)
along the line of its perforations to allow of the upper or stepped edge of the key
sliding a little in the perforations to engage the pins.
Whilst I have described one form of bolt-lock it will be readily understood as
herein before stated that any ordinary bolt-lock may be employed and adapted
to the purpose, the essential feature of the invention being the application to a
cycle frame of any bolt lock rigidly attached thereto at such a point that the
bolt of the lock when shot will engage the teeth of the sprocket and securely
lock the latter against rotation, the lock being provided with suitable means for
attaching it to the machine, and its bolt having its end specially formed to obtain
a good engagement with the sprocket teeth.
It is obvious that the lock may be placed on any part of the framing where
its bolt can engage the sprocket teeth and I prefer to so place the lock that its
bolt shall engage the sprocket radially although this is not essential.
The end of the bolt of the lock is preferably formed to fit and engage between
two teeth of the sprocket as shown in the drawings, but it may equally well be
formed to engage over one tooth. Where an ordinary flat bolt-lock is adapted
to the invention I prefer to form its plates or cheeks of sufficient length to cover
the bolt when shot, leaving sufficient room however for the sprocket teeth to run
between the cheeks, when unlocked.
As in some machines there will be found very little room for the lock at the rear
of the sprocket, owing to the bend of the tube and to the sprocket being set close
in, I may in such cases cut away the back of any bolt-lock to reduce its length
and reduce the back of the bolt to the form of a pin to work freely into a hole
which I provide for it in the tube. This allows free play to the bolt. The form
of lock shown in the drawing will bowever be found to suit all machines.
To secure a good attachment of the lock to the frame tube, I may dish or form
the face of the case or one of the lock plates to the contour of the tube, and this
will be found particularly desirable, if the lock is to be placed on the bend of
the tube.
My invention is more particularly applicable to bicycles but it may obviously
be equally well applied to other cycles.

page_text: 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 :-
1. The improvement in cycle locks which consists in so applying an ordinary
bolt-lock rigidly to a suitable part of the cycle frame near the sprocket wheel,
that the bolt when shot will engage (preferably radially) one or more teeth of the
sprocket and thus lock the latter securely against rotation, the end of the bolt
being shaped to the contour of the part of the sprocket engaged, in order to afford
a good engagement, substantially as hereinbefore set forth.
2. An improved cycle lock having a case adapted to be attached rigidly to the
cycle frame near the sprocket wheel, a bolt movable in said case and having its
end formed to engage the teeth of the sprocket, a stop fixed within the case to
limit the throw of the bolt inward and outward, and three series of pins placed
loosely in corresponding perforations in the stop and in the bolt to lock the latter
in its inward and outward positions but adapted to be unlocked by means of a key
with a stepped edge substantially as hereinbefore described and illustrated.
3. A cycle lock formed of an ordinary bolt-lock having the end of its bolt
shaped to fit between, over or against one or more teeth of the sprocket wheel
and having suitable means of rigid attachment to the cycle frame, the whole
adapted to be so fixed on the cycle frame near the sprocket wheel that the bolt
when shot will engage the teeth of said sprocket and thus lock it securely
against rotation substantially as herein before described.
Dated this 24th day of July 1896.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Birmingham, and London, Patent Agents.