Building a fold down door with torsion gas spring calculation

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Discussion Overview

The discussion revolves around the design and calculation of a fold-down door mechanism for a wall-mounted cabinet, specifically focusing on the use of torsion gas springs to ensure safe and easy operation. The context includes practical considerations for weight management and user interaction with the door.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • Robert describes his project involving a 3x7 feet fold-down door weighing approximately 40 lbs and expresses the need for tension or torsion gas springs that pull rather than push to prevent the door from dropping unexpectedly.
  • One participant suggests sourcing gas springs from auto wreckers, emphasizing cost-effectiveness and ease of mounting.
  • Another participant points out the challenge of using standard gas springs, noting that they typically support weight rather than assist in lifting, reinforcing the need for a torsion gas spring that pulls.
  • A further response discusses the mechanics of the door operation, suggesting that a latch mechanism should allow the door to glide open easily, while also raising concerns about the practicality of engaging the latch from a standing position on the door.
  • One participant proposes an alternative solution involving a pulley system with a 40 lb weight to assist in the door's operation.

Areas of Agreement / Disagreement

Participants express differing opinions on the best mechanism for the door, with some advocating for torsion gas springs while others suggest alternative solutions like pulleys. The discussion remains unresolved regarding the optimal approach to achieve the desired functionality.

Contextual Notes

Participants have not reached a consensus on the specific type of gas spring needed, and there are unresolved questions about the practicality of the proposed latch mechanisms and alternative solutions.

Who May Find This Useful

Individuals interested in DIY projects involving cabinet design, those exploring mechanisms for heavy doors, and anyone looking for practical solutions to similar engineering challenges may find this discussion relevant.

Robert C
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I'm building a wall mounted cabinet, with a fold down door. It is for my grandson's slot car track, in his bedroom. The door is 3x7 feet and weighs approximately 40 lbs. It is mounted length wise, on the wall. I think I need tension or torsion gas springs, which pull instead of push. I don't want the door to drop down and hit him and I want it to be easy to open and close. The door will open 90 degrees and rest on the floor. I can mount the two springs, wherever needed, as I have no set point which needs to used. I have tried several gas spring manufacturers and they have not been of any help. I just need to use a stock spring and mount it accordingly, but I don't know how to figure what I need. Can anyone help me with this?
Thank you,
Robert
 
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I would go to an auto wreckers and salvage some gas springs from hatchbacks. I've paid less than $10 a pair in the past.
Make sure you get ones with suitable mounts so you can screw then straight on.
 
The only problem with them is they hold the weight up and in this case it's opposite. The weight comes when closing or lifting the door. I need a torsion gas spring, that pulls.
 
I know. That's a better solution IMO.
The door is held closed with a latch, release the latch and the door glides open (to rest on the floor). Force is needed to close the door, lean on the door while engaging a latch 3 feet from the floor.
Just like a hatch back really.

The alternative seems less user friendly:
Force the door open (down to the ground) then latch it down - Presumably you don't want a hole or something on the floor for the latch, how will you engage the latch and also keeping the door down? with a latch at ground level while standing on the door? Sounds awkward.
 
How about a pulley and 40lb weight?
 
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