Lift up bed for new self build.

Gromett

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Feb 27, 2011
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I was originally going for a 20' box truck. But the plan is now a 16' box truck.
This means a fixed bed although still possible does mean a loss of some of my original ideas.

I decided to look into lift up beds and have done a few designs using pulleys with either a counterbalance weight, motors or hand cranks ratchet.

I have also looked at really long Linear actuators and servos. Motors with rotary encoders and PWM drivers..

It has been fun trying to figure out the best engineered solution to this problem..

Today in my youtube recommended videos list this popped up.. Seems like a good solution apart from not being able to easily hide the mechanics.


Anyone have any good ideas/suggestions?
 
Sep 26, 2013
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Have you looked how the converters do it, I think Burstner have one in a van, CamperUK in Lincoln might have one in. Take a spy camera.
 
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Gromett

Gromett

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It has given me an idea though.
Using seatbelt straps instead of ropes and I can simply use 4 speed controlled motors :D
Never thought of using seatbelt webbing (y)
 

TheBig1

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one of the hymer specialists, edgehill I think, takes out the overcab drop down bed if customers want and install cupboards. they may have one or more in the scrap pile you could adapt
 
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Gromett

Gromett

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one of the hymer specialists, edgehill I think, takes out the overcab drop down bed if customers want and install cupboards. they may have one or more in the scrap pile you could adapt
Thanks for the suggestion, not sure it would be quite right for my use case though further back in a much wider truck... But worth some consideration nearer the time.
 
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Gromett

Gromett

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It might be worth fitting a hex end on the other to that of the motor as a failsafe backup ? :) The simplest option might be a parallelogram type system of supports to that you push horizontally to go up to store position with gravity doing the deployment . It would also allow to be slightly forward of rear wall and possible cold area ?
 
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Gromett

Gromett

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It might be worth fitting a hex end on the other to that of the motor as a failsafe backup ? :) The simplest option might be a parallelogram type system of supports to that you push horizontally to go up to store position with gravity doing the deployment . It would also allow to be slightly forward of rear wall and possible cold area ?
Yup and an extension bar and socket on my drill :p Already thought of that :D

The bed will drop down over my extra long lounge/sofa/spare bed. So I always have that (y)
 
Sep 16, 2013
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I know someone who has ordered actuators from China to fit a bed like this in a Sprinter. Not sure if he's fitted them yet and the result, but can give him a call tomorrow and pick his brains if you want?

If not, would stepping motors be powerful enough? Thinking similar to a 3d printer axis maybe?
 
Sep 14, 2013
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Found a diagram of the mechanicals for this;
Parts required.
1) Lots of seat belt webbing.
2) 2 drive bars with 2 drums on one.
3) Geared down electric motor capable of lifting the whole bed...

Brilliant. This is the design I am using.. Aluminium frame with wood surround.

View attachment 257700
Here's a similar one in action, approx. 3m22s in to the video
 
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Gromett

Gromett

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I know someone who has ordered actuators from China to fit a bed like this in a Sprinter. Not sure if he's fitted them yet and the result, but can give him a call tomorrow and pick his brains if you want?

If not, would stepping motors be powerful enough? Thinking similar to a 3d printer axis maybe?
The linear actuators are an ideal solution, and I was thinking about them. I have ruled them out because there are actually quite a few potential issues that made a China order out of the question for me.

I do like the seatbelt strap idea with a single motor and think that is the route I am going to go down (until the plan changes again :p )
Thanks Though.
 

Camdoon

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Sep 22, 2012
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Our Adria has a quick reset fuse handily available which triggers if the bed is put up too far etc. May well be worth having something similar as it will happen one day - no doubt at the most inconvenient time :)
 
May 4, 2018
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Hi Gromett I think you'll find one of the self builders is doing a drop down bed in their conversion @Gary Wrench may be worth comparing notes.

Paul
Sorry, I’m a bit late to the party..
I looked at all the options and was concerned about the weight hung from the ceiling and strengthening the roof so went for a belts and braces approach . I have aluminium framed bed, aluminium profile uprights, and 1m long electric actuators mounted from the floor to push the bed up to the ceiling of my L4H3 and drop down 1m which is about midway. Still in kit form as I’ve been moving my business from one unit to another these last few weeks :( still an office or two to build then back to it... oh hold on I have a L3H2 race van to build for a trip in a couple of weeks so will get back to the family camper after that one !
Actuators are from Gimson Robotics, cost circa £750 complete with wiring loom and two sets of switches. The aluminium profile cost about the same so it’s not cheap... I’ve probably over engineered it big time :)
 
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