Time Delay

Dunno about that... depends on who you're feeding and why.

Thank you, is not that simple.

Expressing myself better: 1 minute should be the maximun time. And getting one minute from a kitchen timer would require rotating only 1/60th of a turn and that would require another mechanism, in our application the system would trigger a device after a quarter turn of a knob

https://www.surplussales.com/Relays/RETimeD-1.html

No electricity available or batteries desired by the client

You need to specify the force required, and the motion needed, at the expiration of the time after turning the knob....

Torque: about 10 Nm, rotational, 1 minute

I went to Google and typed in : mechanical time delay. Then chose heading : shopping.

Just Google it.

This?

interesting!

Thanks, I asked Elkay if this is fully a mechanical item

I believe these are controlled by air bleeding out of a hole.

Yes, it could be

You need to clarify your information, all so far are looking at electric switches with mechanical delay elements, such as springs & gears, compressed air through an orifice, all not known for accuracy and reliability.

Those are some methods of mechanical delayed action, but do you need an electric switch to be activated, or to delay some mechanical motion in a machine, rotation, linear actuation?

You got my idea RW! the need is for delaying the triggering of a rotational mechanical device. Firts I thougth of a hydraulic or pneumatic device but temperature would surelly influence the calibration and friction devices require too much maintenance. Also of course I am looking fora compact system. Google didn´t help much

In English units, 7+ ft-lb, not an insignificant force, when looking at electric timer mechanisms. However, well within human manual capability, not particularly small, though.

The user will reset the actuating force storage by hand, a simple twist of a knob, at the end of charging automatically release the timing? Part of a rotation as the output?

Someone will recognize this has already been made, other than our Goldberg or TV Elementary opening credits enthusiasts.

I am sorry for not being clear enougth. The timer would be connected as a secondary part of the main mechanism and it´s torque should be high enougth to trigger a release mechanism that would let a valve return to an initial point. So the torque would not need to be so high, sorry. I estimate for now that a similar torque to a standard kitchen timer should be ok. Sorry I can´t give more details, my client is claming a patent fiel for this design.

Why mechanical?

See Post 10

The client requested it, he will use it on an movil mode without energy availability

As a switch aficionado I'm upset by what's readily available.

custom switches can be made by the folks who make washing machine switches.

or you can cannibalize and customize this popular 60 second timer.

Thanks JE, is this a fully mechanical one? and it should be available for mass production so that´s why I am looking for a OEM unit

It's called a "dashpot" with a variable sized orifice. They used to be used in electromechanical systems to retard mechanical motion over time. They often used a bimetal strip to control a tapered needle valve in order to overcome the change in viscosity of the damping fluid over a wide temperature range.

Eurreka! this is what I am looking for, I will Google it thanks RAM...

dictator.de ....... nope

cultraro.it ........ no

no one yet with a solution

you may have to build it. It seems some sort of emergency escape mechanism might use this feature, delay opening a fire suppression valve until the occupant has evacuated, purely mechanical and simple to be reliable under most conditions....

Circuit breakers use stored mechanical energy to open their contacts, they are charged mechanically, and convert linear motion to rotary, you need a small pilot device such as found on a pneumatic time delay relay (dashpot) to release the springs. A relay armature may require a similar force as the thermal trip element in a molded case circuit breaker...

Yea, I designed one myself but it would need time for tests and my client is hurried to sell his invention. So I am looking for a OEM unit, hopefully Google helps. The closest thing I flund is a dashpot for 20 RPM from Cultraro form Italy but I need a 0.25 RPM and don´t want to add more gears to reduce that speed

First a word from our sponsors:

http://www.globalspec.com/learnmore/mechanical_components/shock_vibration_control_products/shock_absorbers_linear_dampers_dashpots

Then search for pneumatic timers on the GlobalSpec site and the web also.

A pneumatic timer would require air supply which we could not afford for this design, I apreciate your help

The air is compressed manually in the charging cycle, where the energy to open the valve is stored. This energy is stored similarly to the energy stored in the spring of the kitchen timer. The orifice allows some of the air to bleed out slowly before releasing the latch to allow the remaining energy to move your delayed action device.

Not lucky yet to find one supplier but thanks to your idea I will try a pneumatic linear actuator connected to my rotational device

Update, FESTO seems to have a solution! they will send it soon