Mask with collapsable air chamber

[jac_r]

To reduce the requirements for equalising the pressure for masks, why aren't they designed with a rubber/collapsable chamber (on your chest or back) that would compensate for the actual mask in front of the eyes?
Obviously this system would imply a set maximum depth according t the size of the chamber compared to the volume of the mask, but i can imagine a reliable system for a 60m depth model.

What do you think?

 

[cdavis]

Such apparatus were once common on goggles used by pearl divers and the like. If you hunt, you can find pics of these. I don't think anybody used these much below 30 meters

To do the same for a mask might work, but would take more air and the chamber would need to be very close to the mask,preferably below. For a 60m dive, calculate the extra amt of air you would have to take down with you, something like 3/4 liter for a very small volume mask. The extra buoyancy means you have to work harder both going down in the early part of the dive (very bad for dive reflex) and when deep coming up. That becomes a problem.

A pipe mask using swim goggles would have the same effect without the extra buoyancy.

Connor

 

[DRW]

The idea of separate air chambers with diving eyewear is quite an old one:

Japanese googles with celluloid-protected rubber air bulbs are illustrated in Guy Gilpatric's seminal work "The Compleat Goggler":

and here's an image of "pipe goggles"

from an illustrated thread entitled "Goggle/mask squeeze and options to deal with it", which is worth a look at http://mernetwork.com/index/showthr...e-and-options-to-deal-with-it-(possibly-NSFW)

DRW

 

[Peter123]

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[Williepate]

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[popgun pete]

To reduce the requirements for equalising the pressure for masks, why aren't they designed with a rubber/collapsable chamber (on your chest or back) that would compensate for the actual mask in front of the eyes?
Obviously this system would imply a set maximum depth according t the size of the chamber compared to the volume of the mask, but i can imagine a reliable system for a 60m depth model.

What do you think?

That is what your lungs are for and a provision for your nose to exhale partially into the mask, the simplest solution possible.