Improvements in or relating to Bicycles, Tricycles, Velocipedes, and all such like Vehicles.
Year: 1891

page_text: Date of Application, 13th Aug., 1891
Complete Specification Left, 13th May, 1892-Accepted, 18th June, 1892
PROVIDIUNAT DE MULTE
Improvements in or relating to Bicycles, Tricycles, Velocipedes, and
all such like Vehicles.
I, JAMES CLARK POOL, of 51 Quadrant Chambers New Street Birmingham
in the County of Warwick Agent, do hereby declare the nature of this invention
to be as follows:-
This invention relates more particularly to bicycles and consists of an improved
form of crank whereon the pedal may turn or revolve.
Hitherto this crank has been made in one solid piece, but I propose to make it
in two parts, the upper part to be tapped with a screw thread to receive the lower
part, which carries a wormed screw to take thereinto, these parts being screwed
together form a thoroughly rigid crank.
.
Or if preferred I may worm the upper portion of this crank and tap the lower
with a screw thread the parts being adjusted in the same way.
Or instead of the screw thread and worm I may if desired use other suitable
means of attaching the two parts together consistent with rigidity and freedom of
motion.
The object of making the crank in two parts is that in any event of sudden
pressure, being brought to bear whereby the pedal or crank would be injured or
strained by such pressure it shall be relieved, by the lower portion of the crank
twisting round in the direction of the strain.
Moreover in the event of the lower portion of the crank that carries the pedal
becoming injured or broken it will be a simple matter to replace same, without the
necessity of providing an entirely new crank.
This crank action obviates all possibility of damage to the pedal, pedal pin, or
crank of a bicycle, thereby affording greater security against accident, by side
fall etc.
EDWD. J. PAYNE & SON,
104, Colmore Row, Birmingham, Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in or relating to Bicycles, Tricycles, Velocipedes, and
all such like Vehicles.
I, JAMES CLARK POOL of Quadrant Chambers New Street Birmingham in the
County of Warwick Agent, 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, reference being had to the drawings
hereunto annexed and to the figures and letters shewn thereon
My invention relates more particularly to bicycles but is also applicable to
tricycles and other velocipedes, and consists of an improved form of crank
whereon the pedal pin and pedal is attached.
Hitherto this crank has been made of one solid piece of metal but I propose to
make it in two separate parts either detachable or hinged or jointed, the main
principle of this being to construct a crank that is capable of moving out of its
rigid place if necessary either in case of accident or design and thus turn the pedal
pin and pedal with it so that straining or bending the bicycle crank pedal pin or
pedal is avoided for by reason of the crank being in two parts in the event of any
sudden pressure being brought to bear as in the case of a fall of the bicycle

page_text: whereby the crank pedal pin or pedal might be injured or strained by such
pressure they shall be relieved by the lower portion of the crank upon the extreme
end of which is the pedal pin and pedal turning or twisting round in the direction
of the strain; thus avoiding damage from concussion.
DESCRIPTION OF THE DRAWINGS.
Figure 1. is an elevation of the two halves of the crank partly screwed together
with pedal pin, and pedal attached.
Figure 2. is an elevation of the two halves of the crank detached.
Figure 3. an elevation shewing the two halves screwed together.
Figure 4. an elevation of the upper half of the crank (an alternative method)
also in section the lower portion of same.
Figures 5 & 6. a further alternative method shewing a binge or joint for
connecting the parts, kept rigid by a vertical side spring or plate.
Similar letters refer to similar parts on the several figures.
A Figures 1, 2, and 3, is the upper part of the crank, this upper part A is
tapped with a screw thread B (seen in dotted lines) to receive the lower part C
which carries a wormed screw D to take thereinto, attached to the extreme end
of the lower part of the crank C is the pedal pin E and pedal F. in the usual
manner.
The parts being screwed together form a thoroughly secure and rigid crank.
Or if preferred I may worin the upper part of the crank A as at G and tap the
lower C as at H with a screw thread the parts being adjusted in precisely the
same way see Figure 4.
Or as a further alternative instead of the screw thread and worm described
above I may if desired use other suitable means of attaching the two parts of the
crank together consistent with rigidity and freedom of motion. A method is
illustrated in Figures 5 & 6 wherein it will be seen that a joint or hinge I is used
whereby the two parts are free to turn, support being obtained by means of a side
spring or plate J secured to the upper part of the crank in any suitable manner,
preferably by a screw K.
By the use of either of the above named methods not only will undue strain be
taken from the crank and attachments in cases of accident etc., but in the event of
either of the parts of the crank becoming injured or broken, it will be a simple
matter to replace the same without the necessity for providing an entirely new
crank.
It is claimed that by this principle all possibility of damage to the crank pedal
pin or pedal of a bicycle is obviated thereby affording much greater security
against accident by side fall and otherwise.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I wish it to be
understood that I do not limit myself to the precise details of construction herein
set forth as I may vary the same as occasion may require without departing from
the general principle of this my invention I declare that what I claim is,
The principle of constructing the crank for carrying the pedal pin and pedal in
bicycles, tricycles velocipedes and such like vehicles in two parts viz., an upper and
a lower, such parts being connected together by a screw thread and worm, or
hinged or jointed or otherwise suitably connected for the purpose and in manner
substantially as herein more fully set forth and specified.
Dated this 12th day of May AD 1892
EDWARD J. PAYNE & SON,
104, Colmore Row, Birmingham, Agents for the Applicant.