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Farthing Penny Arm
Assist Grocery Bike 2017:
VIDEO
Arm
pulling
has been
added to complete this design and at least double the arm power boost.
The
arm pull drives a 12 tooth RH freewheel on the smaller 20” front wheel. via
a routing pulley around the axial lower handlebars. This gear matches the 16T LH freewheel on the 26” rear wheel drawn by pushing the
handlebars.
Rather
than supporting a pull point far away from the existing frame and then have
the difficulty of transferring the pull to the yawing front wheel, the
existing wire from handlebars to seat was doubled with a tube that slides
under the middle of the handlebars ontop of a wide pulley. A new wire under
the tube from its front end turns through a deep groove in the center of
the pulley and then runs down and a bit to the right to crossloop the
routing pulley which stops it from derailing. The only wire to wire slip is
radial at the crossed tangents and no wire wear or damaging is noticeable
after 6 months.
The
shockcord inter-tie of arm push and pull is
routed from down on the RH of the gooseneck to down and back on the
LH.via 2 pulleys of 90° wrap on top of the gooseneck.
Concerns
about pulling oneself off the saddle did not materialize rather uphill one can pull the handlebars
very hard.and the armpower is more than doubled. Now all muscles in the
arms and stomach and back muscles are exercised.
A
final step will be to use an electric hub made for a folding 20” rear wheel
bike on the front wheel for 9 or 13 tooth pulling and electric assist.
(Also road tested in 2017. was
flanging the Farthing Penny reversed frame joints For compact packing if
required.)
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Cargo
bucket holder, armpower chain
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T- Bearing, Locking
Barrel, Front Brake
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Bridle,Saddle Pulley
and Locking Pin from Below
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Setting die for depth of
cut against left hand bearing cup (undersize) by locknutting cutting edges
vs tightest radial.
Die then edge- clamped
in vise and hub fed down and left handed into it by hands turning and
loading rim parallel to plate.
(Panniers require
extensive frames and support points to keep them out of the spokes,
complicating removal. In the front their weight and volume capacity is
limited by turning with the wheel. Rear panniers or racks do not allow
monitoring the contents when riding and add extra spoke-breaking load to
the rear wheel which already bears 110 lbs
of a 175 lb rider. Backpacks have a particularly high center
of gravity again too far back and exacerbate the differential cooling
problem that leads to a wet and clammy back yet a frozen front.)
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