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While cleaning the latest of my kids' science experiments
off the driveway with the pressure washer, I noticed that it
does a really good job of getting accumulated dirt and
up when the nozzle is set to the tightest spray pattern. You
can quite easily see the clean marks on the concrete
everywhere that you've sprayed. Unfortunately, when the
nozzle is set so narrowly, the target area of the driveway is
miniscule, so it requires a lot of careful back and forth
spraying in order to clean even a small area, and getting
whole driveway clean would probably take days.
One solution to this problem would be a small cart that
would hold the pressure washer wand (and the washer body
and assorted cables and hoses as well). The wand would be
mounted in a rotating head on the cart, pointing straight
down just a few inches from the surface.
As the cart moves slowly forward (powered by water
pressure, naturally), the head that holds the wand would
rapidly oscillate back and forth, sweeping the nozzle over a
patch of the surface maybe a foot or so in width. The cart
thus crawls across the driveway, leaving a clean strip of
concrete behind it.
Once the cart reaches the end of the driveway, you simply
turn it around. Repeat until your entire driveway is
Robotic Pool Cleaner
kinda like this, but designed for the driveway instead of underwater [Cedar Park, Aug 19 2013]
||This machine could easily be programmed to switch on and of in sequence, thus printing your message to the world on your drive way in cleanliness
||Forget wheeling the cart. A giant x-y track in the spirit of pen plotters would be much more fun to watch.
||// printing your message to the world on your
drive way //
||"I am an ostentatious narcissistic idiot, with
lots of money but no taste or common
||[bigsleep] - Large clean area - "This driveway is dirty. To clean the rest, call Powerwasherz 555-1234" - Large clean area