Year: 1896

page_text: A clerical error in the origmal Specification having been amended by
the Patentee with the consent of the Comptroller, the printed Specification
on page 2, before claim 1, will now read as shown below
* Having now particularly described and ascertained the nature of our
said invention and in what manner the same is to be performed we
declare that what we claim is :-"

page_text: Date of Application, 2nd Nov., 1896
Complete Specification Left, 22nd July, 1897-Accepted, 9th Oct., 1897
PROVISIONAL SPECIFICATION.
Improvements in or relating to Cranks the Stroke of which is
Adjustable.
We, HENRY BELCHER, General Manager, and HENRY CAMPION, Clerk, both of
Messrs. Humber & Company Limited, Beeston, in the County of Nottingham, do
hereby declare the nature of this invention to be as follows:-
This invention relates to cranks particularly cycle cranks in which the length
of the throw from the centre of the crank axle to the centre of the crank or pedal
pin can be varied.
The invention can be carried out in the following manner:
The free end of the crank is enlarged so as to receive an eccentric ring or block
which carries the crank or pedal pin; this eccentric ring may be secured in the end
of the crank in any suitable manner preferably by screwing it into the end
of the crank which thus forms a strap around the eccentric, the strap being divided
and the ends adapted to be pinched together by a screw or other means.
The pedal pin may be secured in the eccentric ring or block by screwing
sweating or other suitable means.
The adjustment is effected by slackening the screw or other means by which the
eccentric ring is held and turning the ring with its pin round to the required extent
thus varying the distance between the centre of the pedal pin and the crank axle.
Holes for a pin spanner may be formed in the ring or other means provided to
facilitate turning it when necessary.
Dated this 2nd day of November 1896.
BOULT & WADE,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Cranks the Stroke of which is
Adjustable.
We, HENRY BELCHER, General Manager, anu HENRY CAMPION, Clerk, both of
Messrs. Humber & Company Limited, Beeston, in the County of Nottingham, 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 cranks, particularly cycle cranks in which the length

page_text: of the throw from the centre of the crank axle to the centre of the crank or pedal
pin can be varied to suit the requirements of the rider.
In the accompanying drawings
Figure 1 is an elevation of one construction of crank according to this invention,
and
Figure 2 is a sectional plan on the line 2-2 of Figure 1;
Figure 3 is a view similar to Figure 1 of an alternative construction of the
improved cranks.
Figure 4 is a plan of the crank shown in Figure 3, and
Figure 5 is a section on the line 5-5 of Figure 3.
Like letters indicate like parts throughout the drawings.
With reference first to Figures 1 and 2, A is the crank, the end A¹ of which is
formed in the usual manner to fit the axle; the other or outer end is enlarged as
shown to form an annular clip, strap, or bearing A² divided at A3 and having at
each side of the division a lug A. Through the two lugs a screw B extends,
engaging by means of its head with the outer face of one lug, and, by means of
screw threads, with the other lug; by rotating this screw the lugs can be forced
towards each other so as to cause the sides of the clip A to close upon and grip a
carrier C which is placed within it. The carrier C (which in the example illus-
trated is screw-threaded externally to engage with corresponding screw threads
on the interior of the clip) can be rotated in the clip if the screw B is first moved
to slacken the grip of the clip upon it.
In the carrier is a pedal-pin socket C¹ eccentric to the axis about which the
carrier is rotatable. By turning the carrier with its pin round to the required
extent in the clip the distance between the pedal and the crank axle can be varied
as desired. Holes for a pin spanner may be made in the carrier C to facilitate
its adjustment.
The pedal pin may be secured in the carrier C by screwing sweating or otherwise.
There is no nut or other material projection at the back the carrier and crank
being flush or substantially so, and all the fastening devices lying within the
thickness of the crank.
In other
In the modification shown in Figures 3, 4 and 5 the carrier C is in the form of a
flanged disc and provided with a pedal pin C integral therewith.
respects the construction is similar to that illustrated in Figures 1 and 2.
The bearing A for the carrier need not be divided as at A³; it might be a com-
plete annulus in which the carrier could be adjusted and afterwards secured by
means of a screw passed through the bearing into the side of the carrier or in some
other suitable manner.
By this invention the throw of the crank can be varied to any desired degree
within the scope of the parts between two extremes and maintained after adjust-
ment. Conveniently there may be an arrow-head C+ marked on the carrier as in
Figure 1, to indicate upon a scale A5 of suitable extent on the crank the various
amounts of throw to which the carrier and crank pin can be set. Or instead of
the arrow-head there may be a projection on the pedal pin to serve as an index
to the scale. Or the index could be on the crank and the scale on the carrier or
other means to indicate the position of the pin may be employed.
1. The combination with a crank of a rotatable carrier at its outer end having a
pedal-pin or pedal-pin-socket eccentric to its axis of rotation arranged and operated
substantially as and for the purpose described or illustated in the accompanying
drawings.
2. The combination with an adjustable crank of the kind described of a throw-
indicator such as specified.
3. The combination with an adjustable crank of a pedal pin in one piece with a
rotatable carrier such as C substantially as described and illustrated in Figure 5
of the accompanying drawings.
4. The combination and arrangement of parts constituting the adjustable crank

page_text: substantially as described and illustrated in Figures 1 and 2 or Figures 3, 4 and 5
of the accompanying drawings.
100%
BOULT & WADE,
Agcats for the Applicant.