Hey Engineers,
I'm a mechE working in mechanism design for moving systems which must fit in very tiny spaces. I'm working on a design right now which I am having trouble with. The design uses a compression spring to preload a mechanism, but the spring is odd (see below). Any ideas are welcome. Ideally, if anyone can tell me if this type of spring exists (and the name of it, where I can find it, etc...) or a different solution that sounds similar, I would appreciate it.
Background:
A spring is used to preload the mechanism. During retraction, the spring compresses.
- 200-300lb preload
- 3" spring compression during retraction
Idea for a Solution:
The ideal spring would be one which:
- Is preloaded at 200-300lb when the mechanism is extended.
- As the spring compresses, I don't want to add a huge amount of force to the mechanism, so the spring would not increase too much due to that compression.
I was thinking of a variable-pitch spring, but as far as I know they increase in spring rate as they are compressed. I need this spring to decrease in spring rate during compression.
Other Comments:
- The spring needs to be a compression spring.
Thanks in advance! To all of you still working in the office right now, stay safe and clean.
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