[Greenbuilding] re: bike pump

[Robert Tom]

On Tue, 13 Nov 2007 12:08:35 -0500, Stephen Collette  
<stephen at yourhealthyhouse.ca> wrote:

> Could you not just weld a bike cog on a little 1/4 horse motor and
> attach it by chain to the bike?

I'd keep the chainrings, derailleurs, gear cluster and rear wheel of the  
bike intact and simply put a pulley on the shaft of whatever device that  
is being powered to be turned by a belt that is turned by the  
large-diameter rear wheel of the bike.

One revolution of the large-diameter bike wheel would create ## rotations  
of the smaller-diameter pulley on the device being powered.

The chainrings and gears would be selected to suit the difficulty of  
pedalling desired.

Pumping water would be relatively effortless I would think and wouldn't  
require any gear shifting.

Turning a cement-mixer full of wet concrete would be a bit tougher,  
probably requiring that one start out on a smaller chainring+larger gear  
cog and then once the load got spinning, switching to a larger chainring  
and smaller gears. A load of laundry would probably be somewhere in  
between.

Since a bike is relatively light (say 30 lbs or less for an adult-sized  
road bike frame/wheels) it would be easy to move it around to any number  
of devices to be powered and connecting the bike could be as simple as  
slipping the belt onto the pulley to which the electric motor of that  
device was formerly connected.

No ?


-- 
=== * ===
Rob Tom
Kanata, Ontario, Canada
< A r c h i L o g i c  at chaffY a h o o  dot  c a >
manually winnow the chaff from my edress in your reply