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Old 10-08-2017, 02:31 AM   #1
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Question L Track Bed Idea

Hey Everybody! Just wanted to bounce a new Idea I had for a bed conversation.

I'm currently in the brainstorming phase for a bed in my 03 passenger.
I've got this idea of using 4 L Tracks. One on each side near the rear doors and one on each side near the sliding door. These 4 L tracks would then hold a tightly woven Cargo net horizontally that could be adjusted vertically to adjust the "bed" or "large firm hammock". Call it whatever you want ... This cargo net would be tightened by either ratchet straps or cam buckle to keep the surface taut. I then would put a mattress over for comfort.

Crazy idea .... :)

My question is what is the maximum lateral and vertical weight can the ribs hold ?

Has anyone done this before ?
If so can you provide any pictures, video, instructions, or insight of your build ?

Cheers,
Casey
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Old 10-08-2017, 03:12 AM   #2
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Default Re: L Track Bed Idea

https://shop.cavevan.com/collections...ts/van-hammock



I have no affiliation to Cole (who's also a forum member), just posting something that sounds like what you're looking for.
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Old 10-08-2017, 03:35 AM   #3
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Default Re: L Track Bed Idea

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Originally Posted by DieselFumes View Post
https://shop.cavevan.com/collections...ts/van-hammock



I have no affiliation to Cole (who's also a forum member), just posting something that sounds like what you're looking for.


Looks like downward pull on horizontal track.


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Old 10-08-2017, 08:09 AM   #4
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Default Re: L Track Bed Idea

I would look at maximum load on the roof as a limiting factor. I regards to a hammock attached to side walls I would suggest to calculate line tension versus weight and sag, you could have some mighty forces pulling walls inward - http://www.balancecommunity.com/know...ion-calculator

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Old 10-08-2017, 01:01 PM   #5
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Default Re: L Track Bed Idea

Quote:
Originally Posted by caseylentz View Post
...
Crazy idea .... :)

...
Maybe. I have no doubts about the strength of the Sprinter side walls as to holding downward loads. I'm not so certain about a significant load essentially trying to pull the sides together. Back near the doors is probably fine. My concern would be for the center section. Using the trimaran net method should be fine. Using a lesser number of straps will take a bunch of localized/concentrated pull.

It is going to take quite a bit of pull to maintain tautness on the bed support that you describe. Corsair and other multihull sailboats use a similar "trampoline" or net method to bridge the gaps between hulls. The support around the perimeter includes fairly closely spaced (3" or so?) fastening points with cord laced tightly.

Further down the page this site shows various net attachment methods.
http://www.atninc.com/atn-multihull-...quipment.shtml

I don't believe that ratchet straps will be part of the solution.

vic

Added:
Stretcher bars on the net sides could reduce the number of attachment points needed. That may be handier for an L-track design.
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Old 10-08-2017, 04:26 PM   #6
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Default Re: L Track Bed Idea

Not a cargo net bed setup, but used vertical l-track.

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Old 10-08-2017, 04:30 PM   #7
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Default Re: L Track Bed Idea

Great pictures but at their large sizes difficult to see on this site. Reduction to 900 pixels max helps.
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Old 10-08-2017, 07:52 PM   #8
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Default Re: L Track Bed Idea

Quote:
Originally Posted by JFloFoto View Post
Not a cargo net bed setup, but used vertical l-track.

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This looks like the outside van bed frame ? What did you use for the horizontal piece that fits into the L-track ? In your application it looks like there is no center mount to help support the bed. Is that the case ?


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Old 10-08-2017, 08:51 PM   #9
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Default Re: L Track Bed Idea

I always enjoy reading about new ideas for beds. I still have not built mine.

Having used a hammock outdoors, I know how hard it is to get the straps tight enough to keep it off the ground. Ratchet straps, prussiks, or some such is almost a requirement.

A hammock converts all the vertical load to both vertical and horizontal load at the attachment points. The amount of horizontal force depends on how much droop the hammock has. If the cross straps are put under tension with the hammock empty to reduce the droop, then the inward force on the walls in increased.

I'm sure the sprinter is designed to provide some resistance to inward force on the walls during a roll-over, but personally I would never add to it.

Most beds are designed so that the force is transferred to the walls in a downward direction to the floor/frame of the vehicle. This corresponds to the way a Sprinter is designed to be outfitted for service work.

The sprinter upfitter's information very specifically requires that shelves be vertically supported so that the load does not have a cantilevered force on the sidewalls of the van. The shelving has the vertical supports anchored to the wall and ceiling ribs for stability, but not to support the cargo weight on the shelves.
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Old 10-08-2017, 09:05 PM   #10
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Default Re: L Track Bed Idea

Quote:
Originally Posted by julie777 View Post
I always enjoy reading about new ideas for beds. I still have not built mine.

Having used a hammock outdoors, I know how hard it is to get the straps tight enough to keep it off the ground. Ratchet straps, prussiks, or some such is almost a requirement.

A hammock converts all the vertical load to both vertical and horizontal load at the attachment points. The amount of horizontal force depends on how much droop the hammock has. If the cross straps are put under tension with the hammock empty to reduce the droop, then the inward force on the walls in increased.

I'm sure the sprinter is designed to provide some resistance to inward force on the walls during a roll-over, but personally I would never add to it.

Most beds are designed so that the force is transferred to the walls in a downward direction to the floor/frame of the vehicle. This corresponds to the way a Sprinter is designed to be outfitted for service work.

The sprinter upfitter's information very specifically requires that shelves be vertically supported so that the load does not have a cantilevered force on the sidewalls of the van. The shelving has the vertical supports anchored to the wall and ceiling ribs for stability, but not to support the cargo weight on the shelves.


This is a very good point . Perhaps the tension on the hammock or Net needs to be stock and fit perfectly in the van for my idea


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