Does a hinge like this exist? - Ford Transit USA Forum
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post #1 of 10 (permalink) Old 06-16-2019, 11:10:AM Thread Starter
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Does a hinge like this exist?

I'm trying to design a fold down bed platform above a counter with limited space. I want a "sliding hinge" where the two corners aren't fixed.



I can model something that would work in SolidWorks (3D CAD), and I even have the skill and equipment to fabricate it. What I don't have is the time or desire. Thus, can anyone suggest off-the-shelf (or readily available to Canada from the Internet) hinges, linkages, or mechanisms that would perform the same task? Perhaps some search terms to help me out? Bonus points if not insanely priced.


This would be well-supported at the end opposite the hinge, so it would not need to support the full cantilevered load of mattress assembly and sleeper. Also, since there's a counter underneath it, it can probably bear on that when it's down so the hinge mechanism only needs to support the weight of the mattress and platform.



[Note: The screen shots are from a quick mock-up of the mechanism because I'm not sure how to describe it in words. If I build it it will be much more refined!]
Attached Images
File Type: png Bed hinge 5.PNG (33.2 KB, 22 views)
File Type: png Bed hinge 4.PNG (72.5 KB, 19 views)
File Type: png Bed hinge 3.PNG (74.9 KB, 22 views)
File Type: png Bed hinge 2.PNG (44.8 KB, 17 views)
File Type: png Bed hinge 1.PNG (30.4 KB, 18 views)

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post #2 of 10 (permalink) Old 06-16-2019, 12:12:PM
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Consider using drawer slides.

https://www.amazon.com/LIBERTY-94240...sl%2Caps%2C166

Or go high dollar with linear actuators.

https://www.amazon.com/Progressive-A...12-spons&psc=1
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post #3 of 10 (permalink) Old 06-16-2019, 12:17:PM
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How thick is it?

Is the mattress and base folding up as one?

If all the weight is going to be supported else where won't a door hinge work?
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post #4 of 10 (permalink) Old 06-16-2019, 12:24:PM Thread Starter
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Quote:
Originally Posted by phil View Post
How thick is it?

Is the mattress and base folding up as one?

If all the weight is going to be supported else where won't a door hinge work?

Thickness is 6" plus whatever I build for the platform. Probably at least another inch there. I'm trying to avoid having this thickness added to the total wall space it takes up through this sliding hinge arrangement. If I just stick a fixed hinge on one of the corners, it's stupidly simple but this isn't what I'm going for.

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post #5 of 10 (permalink) Old 06-16-2019, 12:26:PM Thread Starter
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Quote:
Originally Posted by Profssr View Post
Consider using drawer slides.
How are you proposing that drawer slides would work, given my example?

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post #6 of 10 (permalink) Old 06-16-2019, 12:27:PM
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I've looked for articulated hinges like you're describing without much luck. I made my own hinged sliding track out of 3/4" unistrut and T-shaped wood slider inside, but I needed 14" of travel and enough strength to support it when deployed.

One thing to play with is a short metal bar, with the pivot holes 50% of the distance you need to move the bed back to the wall. The bed would lift up and over, like a pole vaulter, to rest the pivoted bed corner in it's desired position. Assuming 8" of difference front to back (thickness of mattress and frame) the bar would only be 5" long with the holes 4" apart. Another simple solution is to mimic an old style wood futon frame and have a pin that travels in a dado. Fold down and push in to the wall, pull out and fold up.

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post #7 of 10 (permalink) Old 06-16-2019, 12:55:PM Thread Starter
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Originally Posted by surly Bill View Post
Another simple solution is to mimic an old style wood futon frame and have a pin that travels in a dado. Fold down and push in to the wall, pull out and fold up.

I hadn't thought about it quite like that yet. You're essentially describing what I pictured, but without the vertical guide. It could certainly simplify things, and the vertical guide may not be necessary. I think even just the pressure on the top corner from lifting the other end to fold it up might be enough that actually pulling it out might not be needed. The advantage I see with the vertical guide is that it prevents the mechanism from being wracked/cocked (head/foot different distances from wall) but being far enough apart and with enough slop in the mechanism it may not be an issue.



I like it. I'm going to play with this idea some more but other ideas are still welcome.

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post #8 of 10 (permalink) Old 06-16-2019, 01:10:PM
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Quote:
Originally Posted by Sparky961 View Post
How are you proposing that drawer slides would work, given my example?
From your drawings, it appears that you are simply rotating the bed 90 degrees, from transverse to longitudinal. Your hinges are actually sliders, where one contracts at the other expands as in a parallelogram. As the transverse slider contracts, the longitudinal slider expands, and vice-versa.


Bob

Last edited by Profssr; 06-16-2019 at 01:11:PM. Reason: Spellcheck
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post #9 of 10 (permalink) Old 06-16-2019, 06:47:PM
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post #10 of 10 (permalink) Old 06-16-2019, 07:40:PM
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Not sure of the space constraints but you might consider 8020 10 series linear slides with a pivot post attached to the top. Pivot post could be a threaded standoff which could then go into a flange bearing. Or mount the flange bearing to the top of the linear slide with pivot post on bottom of platform. Components could be arranged or oriented differently to accommodate the space. Lots of ways to skin this cat.

https://8020.net/6425.html

https://www.mcmaster.com/standard-threaded-standoffs

Plenty of linear bearing kits to choose from on Amazon: https://www.amazon.com/s?k=linear+bearing

Hope that helps get the creative juices flowing.

All the best,
Hein
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