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Time Delay

02/28/2017 11:12 AM

Hello, for a design I am making am looking for a mechanical time delay for 1 minute, does any one know who manufacturers such items?

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#1

Re: Time delay

02/28/2017 11:20 AM

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#3
In reply to #1

Re: Time delay

02/28/2017 10:41 PM

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

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#9
In reply to #1

Re: Time delay

03/01/2017 9:29 AM

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

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#2

Re: Time Delay

02/28/2017 12:07 PM
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#10
In reply to #2

Re: Time Delay

03/01/2017 9:32 AM

No electricity available or batteries desired by the client

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#11
In reply to #10

Re: Time Delay

03/01/2017 9:43 AM

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

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#14
In reply to #11

Re: Time Delay

03/01/2017 9:53 AM

Torque: about 10 Nm, rotational, 1 minute

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#4

Re: Time Delay

02/28/2017 11:19 PM

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

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#5

Re: Time Delay

02/28/2017 11:27 PM

Just Google it.

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#6

Re: Time Delay

03/01/2017 4:14 AM
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#7
In reply to #6

Re: Time Delay

03/01/2017 8:51 AM

interesting!

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#12
In reply to #6

Re: Time Delay

03/01/2017 9:45 AM

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

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#15
In reply to #12

Re: Time Delay

03/01/2017 10:09 AM

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

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#21
In reply to #15

Re: Time Delay

03/05/2017 6:31 PM

Yes, it could be

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#8

Re: Time Delay

03/01/2017 8:58 AM

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?

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#13
In reply to #8

Re: Time Delay

03/01/2017 9:50 AM

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

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#16
In reply to #13

Re: Time Delay

03/01/2017 12:34 PM

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.

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#23
In reply to #16

Re: Time Delay

03/05/2017 6:46 PM

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.

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#17

Re: Time Delay

03/01/2017 12:38 PM

Why mechanical?

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#18
In reply to #17

Re: Time Delay

03/01/2017 12:45 PM

See Post 10

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#22
In reply to #17

Re: Time Delay

03/05/2017 6:33 PM

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

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#19

Re: Time Delay

03/01/2017 4:11 PM

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.

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#24
In reply to #19

Re: Time Delay

03/05/2017 6:48 PM

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

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#20

Re: Time Delay

03/03/2017 8:49 PM

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.

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#25
In reply to #20

Re: Time Delay

03/05/2017 6:50 PM

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

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#26

Re: Time Delay

03/16/2017 9:38 AM

dictator.de ....... nope

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

no one yet with a solution

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#27
In reply to #26

Re: Time Delay

03/16/2017 9:54 AM

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...

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#29
In reply to #27

Re: Time Delay

03/18/2017 10:41 AM

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

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#28
In reply to #26

Re: Time Delay

03/16/2017 5:17 PM

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.

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#30
In reply to #28

Re: Time Delay

03/18/2017 10:57 AM

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

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#31
In reply to #30

Re: Time Delay

03/18/2017 8:24 PM

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.

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Cuyanausul (13); JE in Chicago (2); Kilowatt0 (1); lexx7887 (1); Nigh (2); RAMConsult (2); ronc (1); rwilliams (6); SolarEagle (1); StandardsGuy (1); tonyhemet (1)

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