An Improved Lock or Device for Cycles for Preventing the Unauthorized Use or Theft of the Machine.
Year: 1893

page_text: COMPLETE SPECIFICATION.
An Improved Lock or Device for Cycles for Preventing the
Unauthorized Use or Theft of the Machine.
I HAROLD YOULDEN GRIFFIN of The Steam Brewery Strood, Rochester,
Kent, 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 :-
This invention relates to an improved lock or device for cycles for preventing
the unauthorized use or theft of the machine, such device consisting essentially of
two arms hinged together at one end, and constructed with two curved portions
which fit onto, or clip one side of the frame constituting the fork of the machine,
and the contiguous crank respectively, thus preventing the latter and consequently
the driving wheel from turning round, the front or free ends of the said arms being
locked together by means of a padlock. The said arms are formed in two parts,
the front part, or that which grips the crank, being constructed with a screwed
extension, and the other part hollowed out and cut with a female thread for
receiving the said extension. By this means the length of the device may be
adjusted to suit different machines by simply turning the front part of the arms.
The device may be readily and quickly removed by unlocking the aforesaid
padlock, and being of small size it can be easily carried in the pocket or on the
machine itself.
And in order that my said invention may be more fully understood I will
describe the same with reference to the accompanying sheet of drawings in which
Fig. 1. is a side view of the device in its locked position and Fig. 2 an edge view
thereof.
Fig. 3 is a side view partly in section of the device in its unlocked or open
position and
Fig. 4 is a plan of the rear part of a bicyle with the device attached.
4
a, a are the two arms hinged together at a². These arms are constructed
with two curved portions b and c the front part of the arms a³ being separate
from the other part and joined thereto by means of a screwed extension a
so that the distance between the curved portions b and c may be adjusted
by simply turning the parts a³. The curved portion b fits on to the framing
constituting one side of the rear fork d of the machine as shown in Fig. 4,
whilst the portion c fits on to or clips the contiguous crank e thus preventing the
driving wheel from being turned. The device is locked in position by means of
the padlock 9 fitted to the two extensions of the front parts 63 of the arms a
and a'. The device is readily removed from the machine by unlocking the padlock
and opening out the arms as shown in Fig. 3.
The advantages of my improved device are its neatness and adaptability for
being carried in the pocket, or in any convenient part of the machine; there is
also no chance of scratching of enamel or nickel as is the case when using chains;
it can also be adapted to machines with gear cases, and it cannot be shifted or
slipped off even should the pedal be removed; there is likewise no chance of
snapping the spokes of the wheel.
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 :-
1. In a device for locking or preventing the unauthorized use of cycles the
pivoted arms a a provided with curved portions b, c adjustable parts a³ and
nadlock a substantially as described and shown.

page_text: 2. The improved locking clip or device substantially as described and for the
purpose set forth.
Dated this 13th day of April 1893.
F. G. CASSELL,
Of Cassell & Co.,
22, Glasshouse Street, Regent Street, W., Agent for the Applicant.