WizardOfOdds wrote:OP827 wrote:"Another retractable caravan. Not sure if it is commercially manufactured of home made. This time from Czech Republic.
What is interesting is the lower door frame design that allows function it as one piece with upper door half."
and JasonC wrote:"I like it, I've been playing with the idea of one that goes up and down or in and out but decided to KISS for my first one, no moving parts."
A very interesting trailer, I hope we find more about it. Maybe the video intended to feature the power lift, but the flap hinged door captures all the attention -- it seems the Slideavan (https://duckworks.com/slidavan-plans/ & viewtopic.php?f=5&t=64495&start=75#p1210338 ) and many other telescoping pop-ups could benefit from something like this.
We've seen a few examples of flap hinging used to align walls and doors, a good example may be the extending door jams of the famous Trailmanor ... there is pretty good view of it in the video in the append of July 27, 2017 (the one with the caption
"Notice the lower half of the door has two sections which allow it to align its hinge line with the upper half so the entire door can operate as a single unit. This is a common complication with telescoping top & bottom.") at this link:
I considered hinge flaps for both wall and door alignment several times, but always preferred simpler designs that didn't need them. My original plan for the Tip Top Tier Drop (which opens like a clam shell; roof hinged at one end) needed door alignment. The attraction of flap hinging was the hope of using the flip-out door jams to also support the elevated top. But things worked out far simpler with a more conventional design.
There's a tad bit of engineering in that one. It's cool, but all those seals make me nervous, that's a lot of potential failure points.