Improvements in Driving Mechanism for Bicycles and Tricycles.
Year: 1899

page_text: DE BUITIVATION.
1
I
Improvements in Driving Mechanism for Bicycles and Tricycles.
:
I, TIMOTHY MURPHY, of Number 74, O'Connell Street, Clonmel, in the County of
Tipperary, Agricultural Engineer, do hereby declare the nature of this invention
to be as follows:-
Said improvements are in the fixing of the bracket that carries the crank shaft
to which the chain wheel is attached to the frame over the road driving wheel
and partly under the saddle as shewn at A drawing Fig. 1.
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The cranks are fastened on said crank axle at both ends in the usual way
as shewn at "O" Fig. 1. The chain that transmits the power from chain wheel
to the wheel on the hub of road 'wheel'shewn shewn at "B" is adjusted in the usual
way. The propulsion of said cranks is effected by two arms or levers which are
worked by the feet one at each side of road wheel shewn at "." One end of
each lever is hinged or they may be connected with ball bearings to axles shewn
at "F." Said axles are attached to the said frame convenient to the axle of hub
of road wheel. Power is transmitted from said arms or levers to the said crank
pins shewn at "M" by means of connecting rods one for each lever as shewn
at "H." Said connecting rods may be provided with ball bearings at both
ends or the ends connecting with said levers "/" may be provided with point
bearings similar to those used for beams of scales. It is preferred to connect
said connecting rods "H" to said levers behind the heels of the feet of the person
pedaling the cycle. The amount of leverage exerted on the connecting rods can
be varied by altering the bearings to which said connecting rods are attached
as shewn at N." Said alteration is effected by pressing the said rod "H" with
the foot when it will swing back to the dotted lines, shewn at "u" by reason of
the small arm to which it is attached being hinged on the pin shewn at "v."
Said pin is attached to the lever "" thereby increasing the length of leverage
exerted upon said connecting rods and at the same time increasing the distance
travelled up and down of the pedal shewn at "." Said pedal is attached to the
said lever "" as shewn at "P." Said lever "1" is provided with a small arm
which is hinged on to it near the point at "P," the other end of said arm
carries the pedal at "" and when desired said arm carrying the pedal at "t" can
be swung back with the feet to the dotted line shewn at "k" which is
another mode of altering the length of leverage on the connecting rods.
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<
The length of the levers may be altered at the end of lever shewn at F"
is a similar way as described at "P" and "t" and "k" but I prefer altering it at
either of the two points described herein. At drawing Fig. 2 is shewn another
mode of shortening and lengthening said lever "L" Fig. 1 at every revolution of
the said crank and this is effected by the movement of a roller against the said
lever." Said roller is connected to the said connecting rod "H" by an axle
shewn at "L" Said movement is caused partly by the action of the said pedal
shewn at "T" upon the right angular arm which is hinged by the pin shewn
at "N" to the said lever "7." Said action of said pedal is effected by the con-
üecting plate shewn at "" which is hinged at one end to the said pedal

page_text: at "0" and the other end to the said right angular arm at "X" thereby trans-
mitting the power from the said right angular arm to the said connecting rod "H"
by the connecting plate "" which is hinged at one end to the said connecting
rod "H" at "P" and at the other end to said right angular arm by the pin
shewn at "J." From the different angles taken up by the said lever "1" and
the said connecting rod "H" one towards the other as they travel up and down
cause said connecting rod to have a tendency to move backwards and forwards
in the point shewn at "L" where said roller is attached and as the movement of
the foot will have a tendency to keep the said pedal horizontal at every part
of the movement of the lever it will have the tendency of forcing the said
connecting rod "H" away from the said pedals as the crank descends and drawing
it towards the pedal as the crank ascends. There may be a spring connected to
said lever "Z" at one or both sides of said connecting rod at "R, R" to act as a
buffer and to cause a rebound for the movement of said connecting rod back and
forward as the said lever "" moves up and down which said buffer springs may
be used for the said movement of connecting rod either with or without the aid of
a pedal.
Drawing Fig. 3 is intended to shew the position of the different parts described
in Fig. 2 when at the top movement of crank.
Dated this 22nd day of Fulmony 1900
Statement of Address:
TIMOTHY MURPHY,
74, O'Connell Street, Clonmel, Ireland.
TIMOTHY MURPHY.
COMPLETE SPECIFICATION.
Improvements in Driving Mechanism for Bicycles and Tricycles.
I, TIMOTHY MURPHY, of Number 74, O'Connell Street, Clonmel, in the County of
Tipperary, Agricultural Engineer, 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:-
Said improvements are in the fixing of the bracket that carries the crank shaft
to which the chain wheel is attached to the frame over the road driving wheel
and partly under the saddle as shewn at "A" drawing Fig. 1, left with Pro-
visional Specification.
The cranks are fastened on said crank axle at both ends in the usual way
as shewn at "0" Fig. 1. The chain that transmits the power from chain wheel
to the wheel on the hub of road wheel shewn at "B" is adjusted in the usual
way. The propulsion of said cranks is effected by two arms or levers which are
worked by the feet one at each side of road wheel shewn at "." One end of
each lever is hinged or they may be connected with ball bearings to axles shewn
at F." Said axles are attached to the said frame convenient to the axle of hub
of road wheel. Power is transmitted from said arms or levers to the said crank
pins shewn at "M" by means of connecting rods one for each lever as shewn
at "H." Said connecting rods may be provided with ball bearings at both
ends or the ends connecting with said levers "" may be provided with point
bearings similar to those used for beans of scales. It is preferred to connect
said connecting rods "H" to said levers behind the heels of the feet of the person
pedalling the cycle. The amount of leverage exerted on the connecting rods can
be varied by altering the bearings to which said connecting rods are attached
as shewn at "N." Said alteration is effected by pressing the said rod "H" with
the foot, when it will swing back to the dotted lines, shewn at u" by reason of
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page_text: "
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the small arm to which it is attached being hinged on the pin shewn at "v."
Said pin is attached to the lever "" thereby increasing the length of leverage
exerted upon said connecting rods and at the same time increasing the distance.
travelled up and down of the pedal shewn at t." Said pedal is attached to the
said lever "as shewn at "P." Said lever "" is provided with a small arm
which is hinged on to it near the point at "P." The other end of said arm
carries the pedal at "t" and when desired said arm carrying the pedal at "t" can
be swung back with the feet to the dotted line shewn at "K" which is
another mode of altering the length of leverage on the connecting
rods. The length of the levers may be altered at the end of lever
shewn at "Fin a similar way as described at "P" and "t"
and “K,” but I prefer altering it at either of the two points described herein.
At drawing Figure 2 left with Provisional Specification is shewn another mode
of shortening and lengthening said lever “1” Fig. 1 at every revolution of the said
crank, and this is effected by the movement of a roller against the said lever."."
Said roller is connected to the said connecting rod H" by an axle shewn
at "L." Said movement is caused partly by the action of the said pedal, shewn
at "Tupon the right angular arm which is hinged by the pin shewn at "N" to
the said lever "." Said action of said pedal is effected by the connecting plate
shewn at "" which is hinged at one end to the said pedal at "0" and the other
end to the said right angular arm at "X,” thereby transmitting the power from
the said right angular arm to the said connecting rod "H" by the connecting
plate "which is hinged at one end to the said connecting rod "H" at "P"
and at the other end to said right angular arm by the pin shewn at "J." From
the different angles taken up by the said lever "1" and the said connecting
rod "H" one towards the other as they travel up and down cause said connecting
rod to have a tendency to move backwards and forwards in the point shewn
at "L" where said roller is attached, and as the movement of the foot will have a
tendency to keep the said pedal horizontal at every part of the movement of the
lever it will have the tendency of forcing the said connecting rod "H" away
from the said pedals as the crank descends and drawing it towards the pedal as
the crank ascends. There may be a spring connected to said lever "" at one or
both sides of said connecting rod at "RR" to act as a buffer and to cause a
rebound for the movement of said connecting rod back and forward as the said
lever "" moves up and down which said buffer springs may be used for the
said movement of connecting rod either with or without the aid of a pedal.
Drawing Fig. 3, left with Provisional Specification is intended to show the
position of the different parts described in Fig. 2 when at the top movement of
crank.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is
(1) The attaching to the frame under the road driving wheel the crank bracket
which carries the crank shaft, the wheel and the two cranks, one at each side
of said frame which transmit the power to the hub of road driving wheel, sub-
stantially as stated in drawing Fig. 1.
(2) The propulsion of said cranks by two arms or levers, the back ends of said
levers are free to move on bearings which are connected at any desired part
of frame, behind the axle of road driving wheel. Said levers are connected by
rods with the two cranks. Said rods have suitable bearings at both ends in
connection with both the cranks and levers. The front ends of said levers are
provided with pedals to be worked to be worked by the feet substantially as
stated in drawing Fig. 1.
(3) The extending and contracting of the leverage by the moving of the points
of fulcrum on bearings of both pedals and connecting rods on said levers, sub-
stantially as stated in drawing Fig. 1.

page_text: (4) The movements of said connecting rods on their bearings back and forward
on the said levers at every revolution of said cranks by the aid of the said pedals
and springs, substantially as described in drawing Fig. 2.
(5) That the power can be exerted with as much ease for stopping the cycle
as propelling it."