Improved Lock for Cycles.
Year: 1898

page_text: Date of Application, 8th Aug., 1898-Accepted, 14th Jan., 1899
Improved Lock for Cycles.
We, BEREND DETHLEFSEN, Captain, of 83, Eppendorferweg, and BANDICK
FEDDERSEN, Merchant, of 22, Speersort, both at Hamburg, in the German
Empire, 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:-
The subject of the present invention consists of a bicycle lock arranged within
one of the tubes of the frame, the bolt of which lock, when in the closed position,
prevents the motion of one part which must necessarily be movable to enable the
riding of the bicycle, such as, the fork-tube or handle bar. This lock is so con-
structed that the bolt thereof moves in the direction of the length of the tube con-
taining the lock.
The characteristic feature of this lock consists in the fact, that it is arranged
in the tube of the frame, so that it can be easily pulled out, but is prevented from
becoming displaced along the tube by means of the key-pin. This pin being made
to give somewhat under the action of a spring in the direction of its length, thus
perpendicularly to the tube. Upon pushing the lock into position into the tube,
the pin springs into the key-hole in the same; on the other hand upon pressing
in the pin the lock can be easily removed from the tube. When in the closed
position the bolt engages a groove in the circumference of the pin, so that the latter
cannot be pressed in, in this position. The lock is secured by the key-pin spring-
ing into the key-hole, and because the bolt of the lock in the closed position does
not permit the pressing in of the pin, the lock can only be moved out of position
after it has been unlocked by means of a key.
:-
On the accompanying drawings:-
Fig. 1 is a side elevation,
Fig. 2 is a horizontal section,
Fig. 3 is a vertical section and
Fig. 4 shews a key such as used with this invention.
a and b are two circular end plates of the lock which fit the tube of the frame
so accurately that no vibration can occur. The two plates a and b are connected
by means of a plate d through which the pin e transversely passes, and which like-
wise carries the spring f which holds the pin e in the position shewn in Fig. 2,
and enables a slight movement of said pin in the direction of its length. g is a
bolt of the lock which is guided by the pin h, attached thereto, moving in the
slats i and of the plates d and l. At the front end, the bolt is guided, as shewn
in Fig. 2 and 3, in the front end plate a of the lock.
The lock may have four tumblers m of any desired construction, the grooves n
of which are engaged by the pin h according to the position of the bolt of the lock,
and thus maintain the bolt in the desired position; o represent the springs which
maintain the tumblers in the position of action. By the use of several tumblers
of different forms the lock becomes a safety lock which can be opened only with
the agency of a suitable key. The key-pin e has a circumferential groove p which

page_text: is engaged by the bolt in the manner shewn in Fig. 2 and 3 when the lock is in
the closed position, so that the pin in this position of the lock cannot be pressed in,
and it also has longitudinal grooves, to receive the key. The lock is pressed
into the tube of the frame with the help of a rod which is screwed into the back
plate bat q to enable the adjustment of the position of the lock, and also its
removal from the tube. When pushing the lock into the tube c of the frame the
pin e is pressed in and the outer end thereof slides upon the inner surface of the
tube; the bolt g must however first be moved in the direction of the arrows (Fig. 3)
into the open position of the lock, as otherwise the pin cannot be pressed in, as will
be seen by Fig. 2. As soon as the lock has been pushed far enough into the tube,
and brought into the correct position, the pin e springs into the key-hole in the
tube, and the lock is thus fixed so that further means of securement are entirely
unnecessary. As long as the lock is open the pin e can be pressed in, but upon
locking the handle-bar or fork-tube the edge of the bolt is brought into the
groove of the pin e, and thus renders it impossible to press in the latter in this
position.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed we declare that what we claim
is:
--
:
1/. A lock for locking the fork-tube or handle-bar of a bicycle into a tube of a
frame, having a key-pin which is movable in the direction of its length under the
action of a spring and maintains the lock in position within the tube by springing
into a hole in the side of the latter, so that no further means for securing the lock
are necessary.
2. A lock for locking the fork-tube or handle-bar of a bicycle, to be inserted
into a tube of the frame, having a key-pin which is movable in the direction of
its length under the action of a spring, and maintains the lock in position within
the tube by springing into a hole in the side of the latter, so that no further means
for securing the lock are necessary whereas in the locking position, the bolt
engages a groove in the pin, and thus prevents movement of the pin in the direc-
tion of its length.
Tel. 041
f Avaust 1000