In search of a brain...

[Externet]

My last brain transplant did not go well. They gave me a refurbished one. Not recommended...

Am looking for a mechanism assembly that will release a string across a 3mm plastic wall. An actuator inside a hermetic sealed 'bottle'; the mechanism outside holding/releasing the string.
-NO trough-wall holes-

Think as of a helium balloon. The string attached to it comes down to the release mechanism, makes a U turn and attaches to the same place at the balloon.

When energizing a 3.3 volt actuator inside the hermetic 'bottle', should release the string loop held by the mechanism outside the 'bottle'.
Existing industrial devices/solutions are too costly and waaaay too powerful. What/how would you do/suggest ?

(The simplified 'bottle' is actually a 3 inch PVC pipe portion, with some circuits inside, not relevant here, not part of the thread, not in discussion)

 

[(*steve*)]

Sounds like a magic trick

 

[Bluejets]

Saw a trip mechanism from inside an old elcb. Mechanism resembled a relay. Latch was mechanical off the armature, held closed by permanent magnet in the core. When power applied to the coil ( small current) flux of permanent magnet was overcome just enough to release the hold on the sprung armature. Reset obviously was by hand.

 

[Externet]

Thanks. Tried to find pictures of the working guts of an ELCB, unsuccessful so far.

 

[Alec_t]

I'm thinking string attached to tiny rare earth magnet one side of wall , soft iron magnet keeper on opposite side of wall, current pulse through coil around keeper to release.
How much tension in the string before release?

 

[73's de Edd]

Seeeenor Externet . . . .Que Paaaaaaaaaassssssssssa ?

Timing almost coincident with Sir Alec-teeeeeeee, just took me extra poke up and drafting time . . . . before I finished and noticed . . . .
This is considering that the "Balloon " is not either a LARGE weather balloon nor a divers "dead man" marker balloon.

MECHANICO - REFERENCING







73's de Edd

 

[KMoffett]

+1 for Edd's concept. Very simple. I did something similar the release a ball and feather inside a long evacuated tube to demonstrate gravity on objects of different masses in a vacuum.

Ken

 

[Externet]

...How much tension in the string before release?

Pull force is about 20 N

The way I see it is the exterior magnet mechanism should not release the string but move a trigger to release the string.
If there is a device/gadget re-purposable from something else, or toy ?? , please advise.

Energizing one of these (from a diskette drive) :

that makes a magnet slide by the inside wall to the point of pulling an exterior trigger is one of many contraptions in the possible list.

Edd : This seems a better release mechanism by sliding pin, but no trigger :

Seen some cabinet doors with a mechanical push-lock / push-unlock mechanisms that may be applicable.

Keep thinking... thanks.

Why a triple picture showed up... I do not know. Please edit/correct/delete extras.

 

[KMoffett]

One thing not mentioned is how you will set the balloon string clamp in a sealed container. 20 Newtons to Pounds-force = 4.4962. That's a pretty hefty balloon. This is getting to be a "20-questions thread". Can you do a sketch of what you are trying the create?

Sometimes it's easier to help solve you problem, than help solve your solution.

Ken

 

[Alec_t]

The way I see it is the exterior magnet mechanism should not release the string but move a trigger to release the string.

Now that we know you need a holding force of 20N. that makes sense. A reed switch inside the enclosure could acivate the servo shown in your pic.

 

[Externet]

Thanks.

Ken : The string is held outside the 'bottle' by a release mechanism, a magnetic actuator is inside the 'bottle'. If your question is about resetting, take it as no resetting. After release; it's done.

Alec : The white arm in the last picture could be pulled levered towards the 'bottle' wall by a sliding magnet inside the 'bottle' instead of by a servo as pictured.

There is maaany ways to think and that is only one.

 

[Alec_t]

The white arm in the last picture could be pulled levered towards the 'bottle' wall by a sliding magnet inside the 'bottle'

The magnetic pull would be very weak when the arm is away from wall, so I don't see that working well. Better perhaps if the lever were held against the wall initially, by the maximum pull of a stationary magnet, and then pulled away by a spring when the magnet moved?