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Almost linear motion concept

Henning requested to merge HMarxen/OpenLung:master into master

I don't know why the files already mergen from the 26th of March are also in this merge request. But I also don't know how to remove them.

This is a concept inspired by concept 8. For now radically geard towards cost and manufacturability. The next step is to make it pretty.^^

Features:

  • All custom parts are either sheet metal stampings or rods and tubes cut to length.

  • All rods and tubes are the same diameter

  • Design is setup to be equally well made as stampings, laser cuts or CNC milled parts

  • Most parts are orientation agnostic

  • Only one part needs folding. No large radii. No internal folds.

  • Easily available skate board roller

  • Widely available 608 Ball bearings

  • Minimal friction on the Ambubag

  • The cam track is replaceable when worn out

  • A ball bearing reduces wear on the cam track

  • Adjustable pump volume (Still needs some work)

  • Very good access to the Ambubag

  • Easily taken apart and disinfected

  • 12V gear motor

  • The separate motor mounting plate can be easily customized to the mounting wholes of the used motor

  • Most of the motor weight rests on the ground and not on the housing

  • Opposed to concept 8 the whole pump volume can be used

  • No risk of pulling the bag into the machine if the roller locks up

  • Due to the cam track mechanism the pump volume rises nonlinearly. Much like natural breathing. But I don’t know if this makes a difference.

Issues to be addressed:

  • The air volume adjustment is not yet bullet proof
  • 0 points for looks. Everything is geared towards cost and ease of manufacture.
  • Little space for the driver circuit

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