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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.)

 

 

 

 

 


     

 

 

 

sts

Cargo bucket holder, armpower chain

trailer.02s

 

T- Bearing, Locking Barrel, Front Brake

 

dtrs

Bridle,Saddle Pulley and Locking Pin from Below

 

 

Taps locknutted to back off cutting edges for tightness on LH bearing cup.jpg

 

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.)