I got into a conversation about gas struts whilst in parallel I was thinking that they were a necessary tool for single handed erection.
There has been quite a bit written about beds and gas struts but I think some of the basics have not been addressed.
I am intending to write a number of emails to various gas strut companies and some of the principals in Dandy diy gas strut design.
So allowing for the possibility that some of you know more than me (not difficult) here are my basic design questions?
If all the instructions for gas struts say fit with the body uppermost why has everyone done the opposite other than the German builder and the diy Destiny bed struts?
What happens if we change the offsets for the fixing of the mounting points? The dimensions on the diagram shown in the Yahoo group show 330mm out from the hinge point on the bed and 170mm down on the body. The picture of bed and strut system with failed rivets highlighted seems to use differing dimensions much more like an equidistant spacing?
Why do we space the strut positions in the same way on both sides or indeed use the same struts? The LHS (upper) bed has the strain of pulling the whole roof across as well as the bed the RHS (lower) bed is erected with the roof bar sliding beneath the roof. When I get to quoting details to a gas strut supplier does anyone know the weight of the bed frame (with or without bed) and the roof?
I see the the Destiny and Dimension struts are mounted asymmetrically. Indeed the rear ones lie with the bed end lower than the body.
Are Rover 25 standard struts universally considered to be inadequate?
The self made mounting brackets are actually a difficulty or an expense. What is the corner construction of the body like where the bracket attaches? Does it have insufficient strength to allow mounting on one face only? Likewise the bed, rather than spacing from the upright in the "I" section what about a plate on the the base extending outwards? The bed hinges from it's base so if anything it's equalising the forces.Though this would Slightly decrease the force on a bed to be unfolded, and increase the lifting force on the extended bed and increasing the need for a catch to hold the extended bed down. This statement is in error the bed hinges at the top of the bed so if one end of the gas strut was joined there it would decrease the force on the bed in its folded position but would further increase the force on the unfolded bed. A fixing point as high (on the opened bed) as possible would tend to equalise the push on the bed in folded and unfolded states but that brings it's own problems of possible gaps and draughts from the bat wing.
I want to illustrate this but can't lift pictures and diagrams from word documents. I can open in "Open Office" but cant copy pictures or diagrams. If you can please PM me and send the copies through that media or if needs be I'll forward my email address for you to then post to.
Think I've got something wrong? Got more questions? Anything else? Please comment this is my opening attempt at a work in progress, hopefully it can all be cut and pasted to provide a definitive guide in the end.
Though pictures and ideas are coming from a variety of sources the majority of the details come from files in the Yahoo site
Last edited by Tow Itch on Sat Aug 31, 2013 10:06 pm; edited 2 times in total (Reason for editing : Got the affect of moving a bracket the wrong way round.)