Controlled Spring Like Mechanism

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SUMMARY

The discussion centers on the need for a controlled spring-like mechanism that mimics the behavior of a spring without the snapping effect. The user has experimented with automatic door closers but found them unsuitable due to excessive force requirements and size constraints. Suggestions include using springs in parallel with a pneumatic cylinder to manage the return action, aiming for a system that requires approximately 10 lbs of force for a 5-10 inch expansion and contraction.

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  • Basic principles of force and load management
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swightness
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I have a need for a mechanism that acts juust like a spring (I pull, load it up, and when i let go it pulls away and returns to its normal length), but doesn't snap back like a spring.

I have experiemented with automatic door closers, but they are definatly not the answer (require too much force to pull, take too much space, too long)

Is there already a mechanism? Should i just use springs in parallel with a device like a pneumatic cylinder to control the return action? Idealy the system will only require a human to apply ~10lbs of force, and the spring/mechanism will expand ~5-10 inches, and when released, will contract with similar amount of force required to load the device
 
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