Improvements in Pedals and Cranks for Cycles and the like.
Year: 1898

page_text: Date of Application, 27th Jan., 1898
Complete Specification Loft 26th Oct 1868 Accented 27th Ian
1800
PROVISIONAL SPECIFICATION.
Improvements in Pedals and Cranks for Cycles and the like.
We, DAVID SHERLOCK, Rahan Lodge, Tullamore, Gentleman, and John
ESHELBY, Chronometer Watch Maker, 24, Eden Quay, Dublin, do hereby
declare the nature of this invention to be as follows:-
To obtain a new and improved method of procuring additional and novel powers
in cycle pedals and the like, and at the same time, a simple and effective method
of making the pedals telescope inwards, so that the machine occupies less floor
space, and the base is free from projecting points, likewise when so closed, it
would prevent the machine from being wheeled away. We make the pedal
crank terminate in a steel ring say 3" or 4" dia. 3" thick, the inside tapered to a
groove, forming the outer part of a ball race, the corresponding inner cones
being adjustable, having outside flanges. A bar across the lower portion of inner
circle containing slots for pedal blades to pass through, and a centre guide rod
to pedals having two projections which by applying a key on the outside would
secure the pedal out or in by a forward or backward turn as wanted, the projec-
tion nearest the centre acting on the outside of the bar, when drawn out, the
one nearest the outer end of pedal engaging the back of the bar when pushed
in; and when in this position the pedal would at top pass between the upright
bars of frame, so preventing the machine being wheeled. The advantage of
leverage gained, would be that with a less direct rise of the knee, a great deal
more throw would be obtained at the forward and downward thrust, as with a
moderate sized outside ball race, say admitting an excentricity of 3" the knee
would rise 3" less and throw at extremity would be 3" more than with the
present concentric pedals, while owing to outside bearing there would be no
pendulous motion as with an excentric, crank, it would work rigidly but freely.
Dated this 26th day of January 1898.
DAVID SHERLOCK and
JOHN ESHELBY.
COMPLETE SPECIFICATION.
Improvements in redals and Cranks for Cycles and the like.
We, DAVID SHERLOCK, Rahan Lodge, Tullamore, Gentleman, and JOHN
ESHELBY, 24, Eden Quay, Dublin, Chronometer Watchmaker, Optician, &c., do
hereby declare the nature of this invention and in what manner the same is to
Dice 81
Improvements in redals and Cranks for Cycles and the like.
We, DAVID SHERLOCK, Rahan Lodge, Tullamore, Gentleman, and JOHN
ESHELBY, 24, Eden Quay, Dublin, Chronometer Watchmaker, Optician, &c., do
hereby declare the nature of this invention and in what manner the same is to
Dice 8d1

page_text: be performed, to be particularly described and ascertained in and by the follow-
ing statement:
The object of our invention relates to a new and improved method of pro-
curing additional and novel powers in cycle cranks & pedals, and at the same
time to procure a simple and effective method of making the pedals telescope
inwards so that when closed, the bicycle would occupy less floor space, and when
one would be closed, it would effectually prevent the machine being wheeled away.
The description of drawings and how we propose to make the pedal and crank
is as follows:-
The crank is constructed with the ordinary socket, fitting chain wheel axis
pivot, and being secured in the usual manner by a cotter pin; but the opposite
or pedal end terminates in a flat or annular ring either made in one piece with
the crank or secured to it by side brackets and screws or socket but in any case
the ring must be truly flat and revolve in the same plane as the crank.
B
The outside diameter of the ring would be about 4" the same more or less in
different sizes but the dimensions given here are to suit 4" ring, as shown in
Figs. 1 and Sh. 2, the inner diameter about 3" with a thickness on the out-
side of 5/8" tapered to each side to about 1" on the inside of the ring which is recessed
with groove or inverted V forming the outside part of a ball race seen in sec-
tion Fig. 1 Sh. 2, to be made of iron or steel with working surface of ball race
case hardened.
Fig. I Sh. 2 is an aluminium dise, about 33½" outside diameter and 3"
thick cast with a projecting collar or tube on the inside at right angles to the
plane of the disc about 3/4" in height from the flat of the disc the diameter of the
inside of the collar about 23" thickness about "the outside being threaded
with a well cut screw from the top to half way down, S, S, Figs. II' and 3. A
steel cone ring 33/8" dia. outside and 4" thick fits tightly over the outside of the
collar and fills the angle between disc and collar extending " each way, being
secured from turning round by a pin through the disc close to the collar, and
parallel to it, fitting in a slot on the inside of steel cone, or by screws through
the disc into steel cone ring.
Fig. II is a similar disc but with collar half its height and large enough on
the inside to fit well over the other collar when screwed with a female thread,
to receive that of the other collar; a similar cone ring is fitted tightly over this,
and secured in the same manner, working surfaces of both cone rings are case
hardened.
The outside circumference of both these discs is furnished with a short rim
flange D, D, Figs. II* and * and in section Fig. 3 simply to act as dust cap,
working in groove D D Fig. 14.
A hole for oiling ball race is made through the outer ring, marked O, Figs. I^
and
These parts fit together and work as follows; the steel cone ring being
fitted and secured in its place on disc and collar Fig. II" it is placed on a table
with its flat side downwards, and the crank ring Fig. I laid over it, the inside
of ball race R, R, touching the cone ring of Fig. II³ small steel balls are then
filled in all round between these parts and cone ring and dise Fig. II
placed over the collar of Fig. II", with cone downwards and screwed home, with
crank ring between. It may now be lifted and cones nicely adjusted and secured,
by a clamping screw K, Fig. II" and Fig. 3, which passes through the collar
about " from the top and its point engages one of a number of shallow holes
in outside cone ring collar, thus securing all firmly.
The three parts constituting a crank with a circular ring, inside which revolves
concentrically a central disc with ball bearings. In casting the disc and
collar Fig. II a bridge M, M, is provided across the lower part, which could now
be called the bottom as its weight would secure it that position and the thickness
of the collar, through which is drilled three holes parallel to each other, one in

page_text: saw
rods
steel
the centre, of the bridge and one at each extremity, at right angles to the surface
of disc, gg Figs. II" & Fig. 3. These are for the purpose of receiving the centre
rod and rat trap frame of pedal as shown Fig. 3 and Fig. 44 Sh. 2.
The pedal frame may be made of steel tube side
with
toothed blades inserted in the
top of each and flat
back
and front, or the whole frame may be of flat shear steel
with round rod ends to fill the holes, MM, which holes are slotted to take
the flat part of frame. The central rod passes completely through the length of
pedal frame the outside end terminating in a circular head about 3/8" dia., from
which the rod is tapped down about 3/8" and screwed through the outer end of
pedal frame, passes first through the central hole of bridge then to its hole in
back pedal frame bar. It is furnished with a longitudinal guide bar or feather,
or two projecting studs, N 1 and 2 Fig. 4 Sh. 2, whose position would be coin-
cided with the ends of feather bar. A slot in the central hole of bridge, passes
this through. The position of pins or ends of feather bar, is so arranged that if
pedal frame be drawn out fully and the bar TT be turned to the right or inward
screw motion, N engages the outer surface of bridge, pinching it between the
stud or feather and the back bar of pedal frame making it quite rigid. A sup-
plementary stay bar may be added, P, P, Figs. 3 and 4* Sh. 2, a hole in the outer end
of stay bar, through which is passed the centre rod T before putting it through
the frame, so adjusted that when the end N2 is firmly screwed up the head of
centre bar L also tightens the stay the inside end of which rests on the lower
part of the circular disc underneath centre of bridge. And when screw is
slackened the stay may be lifted to pass through the dise, the guide being
brought to correspond with slot, the whole frame may be pushed in till N' has
passed behind the bridge the rod is then screwed tight again, with pedal standing
through bars of bicycle frame or underneath in which position the machine could
not be wheeled. The centre outside head of bar L Figs. 3 and 4 has, a slightly
projecting point or a central hole, to which a key is fitted, a projecting spur from
which engages a notch in circumference of head, so that it can be easily turned
backwards or forwards; an outward rim flush with head of bar prevents the head
being gripped. It will now be seen that that in addition to the circular disc
revolving on ball bearings inside the circular end of crank, a pedal frame has
been added which acts excentrically, its gravity keeping it always at the bottom
and ready for the foot.
In using this the rider would first adjust his position to get all the advantage
the leverage would afford him by raising or lowering the saddle, until the pedal
in lower position was correctly adjusted to length of leg, it will then be seen by
diagram Fig. O¹ Sh. 1, that with an eight inch throw at bottom the knee would
only be lifted five & three quarter inches, the leverage increasing with downward
thrust, also great scope would be given to favourable ankling by depressing the
heel in downward thrust throwing the pedal frame against forward edge of rim.
In this diagram the position of foot (a) Fig. O epresents the height a foot
would have to be lifted with ordinary concentric pedal 8" throw (b) its position
with our pedal, (e) the crank ring and (d) interior circle with pedal blades.
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;-
-
(1) A new and improved method of acquiring an advantageous increase and
disposition of leverage of pedal motion and power, combined with a convenient
lowering of the knee action and an increase of forward and downward thrust
exactly when and only when increased leverage is desirable, contained in and
produced by an excentric motion of a circular pedal adjunct within the circum-
ference of a ball race, increasing speed with diminished power, substantially as
described.
1

page_text: (2) The telescoping of pedals for the more convenient packing and less ground
space occupied, substantially as described.
(3) The locking and securing bicycle wheels, thus preventing unauthorised
removal or stealing rendering it necessary to lift and carry instead of rolling the
cycle away, substantially as described.
(4) A new and improved method for obtaining increased speed, with diminised
power having pedal within the circumference of ball race, combined with a device
for telescoping and locking pedal substantially as described.
Dated this 18th day of Databor 1908
JOHN ESHELBY.
DAVID SHERLOCK.