On Tue, 13 Nov 2001, TSHACK wrote: > I've been brainstorming on what I can use as an alternative to a folded > bellows structure.
I think that there may be several interesting possibilities. I was talking with a fellow sometime back who supposedly knew one of the members of the Deardorf familly, and claimed that they had figured out a way to work pleats inside of pleats. This allowed for good bellows movements in a compressed state while still allowing for relatively long bellows extension. I wasn't able to get any more details, but it sounded like a sort of combination between a bag bellows with a compressible pleated section. Nothing saying that you have to use square or rectangular bellows (tapered or not). There are always the bellows folds used for the construction of concertinas for instance <http://www.concertinas.com/herrington_bros.htm#Bellows>. That would give you something akin to a round or hexagonal bellows design. > One idea I had was to use these little retractable keychains, or id card > holders. The little plastic ones that have a somewhat strong return. That is pretty clever! The one thing that comes to mind here would be that the material has to go somewhere as the structure collapes. This might be prone to the material clumping up. A variation on this idea would be to make the side stiffeners using a piece of spring steel (piano wire or maybe those metal bands used to close boxes). If you designed the structure so that the spring wall stiffener curves away from the center of the bellows it would compress and push the fabric out at the same time. Hmmm ... the guys talking about pressurizing their camera chambers could simply let the air push the bellows material out. It'd be kind of like smushing a balloon. One could build a series of telescoping boxes or tubes in place of a bellows ... There are probably several other possibilities. Those are just what comes to mind as I'm typing. - Wayde ([EMAIL PROTECTED]) _______________________________________________ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
