Re: RE- panic button
Subject: Re: RE- panic button
Date: Wed, 11 Jun 1997 13:47:00 GMT
From: robert.michaels-at-online.sme-dot-org (Robert Michaels)
Organization: Society of Manufacturing Engineers
T> From: Peter Electric <elekessy-at-macquarie.matra-dot-com.au>
T>> T> From: "William Noble" <William_B_Noble-at-msn-dot-com>
T>> T>there is a switch made for use on jacuzzis where shock hazard is
T>> T>significant. The switch is pneumatic - there is a button that you
T>> T>near the jacuzzi, and then a 1/4 inch plastic hose (like aquarium
T>> T>that runs to the pump controls. pressing the button starts/stops
T>> [ ... ]
T>> There's one thing about your idea which I completely dis-
T>> I wasn't the one who thought of it!
T>> My only concerns in implementing it are whether the
T>> button must pushed =hard= to send a proper air pulse
T>> to the controller; also how much of a delay there might be
T>> between the button-push and the controller's reaction.
T>> With an electrical E-Stop push button, only a
T>> delicate touch is necessary to break the normally-
T>> closed contacts. The signal, of course, is sent
T>> with electric speed.
T>> Pushing on, in --
T>> Detroit, USA
T>> Robert Michaels
T>I have these controls on my spa (Jacuzzi) and they do get a bit dicky
T>after a while, i.e. you have to press it a couple of times to get it
T>work. The other problem I see is that if you have a fairly long length
T>of tubing, pressing the button wouldn't build up enough pressure to
T>trigger the switch.
T>Maybe if one attached a squeeze bulb instead of a button, such as on
T>boat fuel primers, the thing might work better.
I would propose a photographers Air Release -- it's a rubber
bulb and a long (5-20ft ) thin tube with a fitting
which fits the cable-release socket on a camera shutter.
Any really good camera shop should have or be able to get
When the bulb is squeezed, a pin is projected from the
fitting. It would be trivial to have this pin actuate
a micro-switch -- and the micro-switch then open one's
contactor in the Tesla power-transformer primary circuit.
Else, the air pressure in the tube might be able to
operate the air switch of a Jacuzzi.
Putting the squeeze on
coiling hazards - in Detroit,USA