Setting parameters for a useful invention is fairly simple when it concerns something as practical as a human powered air compressor to pump air supply to a diver in the water at the end of a 20' hose. Already existing are innumerable air pumps such as used for bicycles. There are gas an electric motor powered air pumps for divers on a short hose already, and that may have precluded the will to produce a human-powered pump (a companion to the diver on the boat would create the air supply for the diver) for divers in impoverished nations or those interested in avoiding contribution to global warming greenhouse gases superfluously.
There are some parameters for the motorless diver's air compressor that might be helpful. The hose like that of an inflatable boat valve should have a one-way gasket that admits air but won't let it backslide out. The hose might also have a pressure regulator at some point that would bleed off excess air so the diver has a constant air pressure. Additionally there might be some sort of 5 minute reserve bottle in the system sometimes that would also signal the diver in some way-perhaps with a chime, if the air supply decreased to one-minute remaining in order to give the diver time tio surface though he or she could free swim to the surface from 20'.
There are some parameters for the motorless diver's air compressor that might be helpful. The hose like that of an inflatable boat valve should have a one-way gasket that admits air but won't let it backslide out. The hose might also have a pressure regulator at some point that would bleed off excess air so the diver has a constant air pressure. Additionally there might be some sort of 5 minute reserve bottle in the system sometimes that would also signal the diver in some way-perhaps with a chime, if the air supply decreased to one-minute remaining in order to give the diver time tio surface though he or she could free swim to the surface from 20'.
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