An Instantaneous Detachable Combination Sprocket-chain-wheel and Crank for Velocipedes and Vehicles of Light Construction.
Year: 1896

page_text: Date of Application, 25th Sept., 1896
Complete Specification Left, 18th June, 1897-Accepted, 31st July, 1897
PROVISIONAL SPECIFICATION.
An Instantaneous Detachable Combination Sprocket-chain-wheel and
Crank for Velocipedes and Vehicles of Light Construction.
I, DELEVANTE WILLIAM CROSLAND of Darnley House 22 Royal Crescent Kensington
London W. do hereby declare the nature of this invention to be as follows:-
The crank is made with a flange on its boss, eccentric to the spindle-hole; this
flange, or eccentric-cam is accurately machined to fit the sprocket-wheel.
The sprocket-wheel is made with a boss, eccentric to its centre, and larger in
diameter than the eccentric cam on the crank; there shall be a hole through the
centre of the sprocket-wheel to accurately fit the crank-spindle; the boss of the
sprocket wheel shall be eccentrically recessed so that the flange or cam on the crank
will exactly fit into this recess.
Upon placing the eccentric flange or cam into the recess in sprocket wheel
(into which it fits accurately) and bringing the spindle hole in the crank into line
with the spindle hole in the sprocket wheel, and passing through the spindle; the
eccentric cam on the crank will then drive the sprocket wheel either forwards or
backwards, the spindle locking the crank and sprocket-wheel together in position
and the fixing of the crank to the spindle in the usual manner shall securely lock
the chain wheel against the spindle and prevent all lateral movement of the sprocket-
wheel.
A thread can be cut on the edge of the eccentric cam and a corresponding thread
cut in the recess of sprocket wheel if desired but I prefer the smoothe surface as
sufficient to keep the attachment rigid and as being more easily detached.
Dated this orth
1000
An Instantaneous Detachable Combination Sprocket-chain-wheel and
Crank for Velocipedes and Vehicles of Light Construction.
I, DELEVANTE WILLIAM CROSLAND of Darnley House, Royal Crescent, London, W.,
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 invention relates to an improved means for securing the crank and sprocket
wheel together on the axle of velocipedes and other light vehicles and has primarily
for its object the easy and ready detachment of said parts.
I will now particularly describe this invention making reference to the accom-
panying drawings in which :-Figure 1 is a view in side elevation of a crank and
[Price Qd1

page_text: sprocket wheel constructed according to this invention, and Figure 2 is a view in
front elevation thereof, partly in section.
Throughout the views similar parts are marked with like letters of reference.
The sprocket wheel A has an eccentrically disposed recess a in its boss a¹, which
is bored centrally as usual to receive the axle X. The boss a may either be made
concentric with the periphery of the wheel or eccentric therewith as shown by the
drawing to save weight. On the boss 6¹ of the crank B is an eccentrically disposed
flange b which is adapted to fit in and engage with the recess a in the boss a¹ of
the chain wheel. The crank B may be secured to the axle in any convenient
manner but I prefer to use the usual transverse cottar pin x engaging with a cut
away portion of the axle.
To ensure a good fit between the flange b on the crank and the recess a in the
sprocket wheel A the edge of the flange b may be slightly tapered or the flange
may be adapted to be screwed into the recess a.
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 velocipedes or other light vehicles, providing the sprocket wheel with an
eccentric recess in its boss adapted to receive and engage with an eccentrically
disposed flange carried by the boss of the crank, and for the purpose set forth.
(2) In velocipedes and other vehicles of light construction securing the cranks
and sprocket wheels to the axles by forming an eccentrically disposed flange on the
boss of the crank and an eccentrically disposed recess in the boss of the sprock
wheel, the eccentrically disposed flange on the boss of the crank being adapt
to engage with the eccentrically disposed recess in the boss of the sprocket wh
and to be kept engaged therewith by the means employed to secure the crank to
the axle, as set forth.
(3) The combination of parts herein described and illustrated by the accompanying
drawing.
318th day of June 1897.
ROBERT E. PHILLIPS, Assoc. M. Inst. C.E., M.I. Mech. E.,
Consulting Engineer and Patent Agent,
70, Chancery Lane, London, W.C., Agent for the Applicant.