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Why
The use of a pulley to lift water from a well is a great improvement over having to lift a bucket with water on a rope with your arms stretched out in front of you (see picture, Burina Faso, 1977). In The Gambia we found farms and gardens given up, because the water table had sunken too deep. To lift water from these wells in sufficient quantity to water the garden had become too heavy a task.
As the pulley can not always be left at the site of the well to prevent theft, such a pulley should be light in weight as to make it easy to take it home. It should be robust, take rough handling such as smashing it against a wall or the floor. It should run accurate with little friction. As indispensable for productive working, it should be easy to repair, even during use in the field.
How
The construction of the pulley is meant to be appropriate for manufacture in a village.
The rim of a pulley can be cut from of thrown car tires.
The hub is made of wood and not from steel to promote manufacture in village handicraft.
A method of construction is developed that needs no fasteners. All composing parts stay together because of being mounted with pretension.
An easily applicable method takes care for cutting the spokes to the accurate size that ascertains running without any wobbling.
The bearing of the pulley consists of two steel pins driven into the center of the wooden hub, running into some windings of rope, attached to the supporting frame construction. Because the pin has a small diameter and because of steel and plastic match well as bearing materials, the pulley runs very smooth and light.
Any wear in this bearing is simply repaired by winding a little more rope from the frame around the bearing pins of the pulley.
The development of this method of pulley construction and manufacture is done in cooperation with a rural project in Senegal, managed by the Foundation "Keur Mousse".The picture shows the first prototype made together with Ives Faye.
Reports on progress in its construction can be found below. A provisional construction manual is put together from pictures as available at present.
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What other people say... |
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by Hans Baarslag - Wed Dec 01 (2004)
Pulley
Dear Sir
Your pulley as a method for hauling waterfrom (deep) wells looks very
good
will not rust and is easy to repair The materials can be found every where
in developping countries But one thing wouldn,t t be helpful to have a
ratchet mechanism also on the pulley.In that way you can stop and rest
half way or you will not burn your hands when the water is running down
and you must try and stop it.
greeting Hans Baarslag
by Reinder / Demotech - Wed Dec 01 (2004)
Re: Pulley
Mr. Hans!
You confuse two ways of lifting water from a well:
- Using a drum on which a rope can be wound. This drum is driven by a
crank. This system employs a bigger bucket or container than the next
item. Indeed such a water lifting device needs a racket mechanism,
specially to be able to fetch and empty the bucket when it is within
grip.
- Using a pulley as is illustrated in the two top pictures to be found at
www.demotech.org/presentation.php?p=6 uses a smaller container of
rubber bag. To haul water depends on swift movements, the bags 'flies'
up and is thrown down again. Same with the pulley system as now being
developed for the Senegal project. The effectiveness of this system
depends on large and swift body movements of arms, shoulders and back of
able people. It is not meant for children or older people. Here again the
rubber bag containing only about 7 liters, is pulled up fast, when
reaching the top, the operator stop pulling and grips the bag in mid air
when it stops in front of him. As this movement is repeated for hours,
such movements become very accurate and effective.
It may be clear that any added racket construction would be superfluous.
by Marc - Wed Dec 02 (2009)
by Sunem - Sat Dec 03 (2005)
Re: Pulley
You have a very good information and you need a cordial congratulations of
my part, because with your help, maby I ?m going to have a10 in my
expedient and a 10 in my homework.
THANKYOU FOR YOUR HELP
by subramani nair - Tue Dec 05 (2006)
well pulley
dear sir/madam
i would like to make a well pulley & lift pulley for my niece for her
school project, pls advice/guide me through how to make with less cost &
with craft items i.e like cardboard/cardpaper stick etc.
suggest u to add this childrens site also
pls reply urgently
regards
s.nair
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