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Automatic Latching System

by Roach, published

Automatic Latching System by Roach Jan 21, 2013
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Summary

I'm attempting to make an automatic latching system for the lid of my heated build chamber.

The goal is to have a mechanism that a handle is pushed into which latches, and unlatches when pushed on again.

Instructions

It's not pictured, but there would be a rubber band or spring pulling the top of the hook arm to the left.

Please make suggestions or modifications to my design!

I'm kinda stuck here.

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Hmm, it looks like it needs "funnels" for the pin to indicate direction of motion. For example, on the left side it would probably work better if the bottom path had a large angled inlet.

I think a picture will be in order. I'll try a quick sketch.

It sure does Austin!

I was attempting more of a cam shape, but that failed.

Your illustration is very clear, but makes me wonder how the pin would travel up the right side, assuming gravity is in effect.

fma - in reply to Roach

I think you need an additionnal spring to route the pin the right way. As far as I remember, such systems always have such little spring.

Roach - in reply to fma

So, one spring to push to the left, and another to push the cam arm up?

fma - in reply to Roach

Yes, I think so. Try to find an old car push-button, and open it; you will find such system.

Glad to help!

The drawing was made assuming that some sort of spring or rubber band is pushing the pin towards the left (as you had documented).

I admit that this whole thing has gotten me a bit curious as to how the latches I've used my entire life work. :p
(I've only taken apart and examined pens, which use a similar strategy but different tricks due to the cylindrical setup)

I'm glad it got you curious.

I get that it needs to be pulled to the left, but is there another spring pushing the arm up (Maybe that's what FMA was getting at), so it doesn't fall down from gravity on the right side of the slot you've drawn?

Glad to help!

The drawing was made assuming that there's a spring of some sort forcing the pin to the left (as you had documented for your design).

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