Push-to-close button activated by push pull solenoid

[JeromeB_mecstudent]

Hi, this is my first time here. I'm working on a project where my role is to design a mechanism that releases a capsule at the right moment. My current idea is to use a push-button latch activated by a push-pull solenoid connected to an Arduino (see image).
Since I haven't selected or purchased a specific push-button latch yet, what key specifications should I consider when choosing one? Additionally, would the solenoid be able to release the latch if there is force applied to it?

 

[3DDave]

For certain, an operating solenoid attached directly to an Arduino is not likely to work; there will need to be some other electrical component involved.

You have to pick something first. Buy several different latches and try them out. Just watched a skilled mechanic who is constantly subject to getting replacement parts that don't function correctly because the OEM (manufacturer) no longer sells them. So he orders every part the local parts supply offers and checks them all just to get one that is close. Ultimately the thing that costs the most is your time.

Spending extra on parts may hurt the wallet, but not as much as it will hurt when you are up at 3am fiddling with an item that isn't working the way you hoped instead of getting ready for (since I presume you are a student) resting and readying for a test or to pay attention in class.

What you are asking for isn't likely something that is a well distributed bit of information. People will push a buttton as hard as required and the latches aren't typically subject to a lot of load. In some cases if the latch doesn't work easily the person will push on the door to compress the seal and unload the latch.

Here is a data sheet from a company that specializes in latches: https://media.southco.com/media/static/TestDataSheet/TD-MP-2-J.pdf
Not any data about how hard it is to push to release. If I had more info I would give it.

It's not a great release mechanism. Look at what is used for a crossbow or a mouse trap where the force from the item being captured is transferred to the housing and the release has very high mechanical advantage. This load could be handled by a micro servo. An Arduino can drive the servo signal directly and the Arduino pass through from even a weak USB supply can support the current requirement for a long enough time to trip the trigger.

 

[waross]

The last time I needed something like that I used the latch out of the trunk lid of a junked car.
An electronic circuit drove a small relay that operated the latch.