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MMD > Archives > August 1996 > 1996.08.18 > 01Prev  Next

Push-Pull Switch
By Spencer Chase

I found a switch that can be modified to work as a push-pull, on-off switch, of the right size and capacity for motor switching. Unfortun- ately it is not too simple. It is a modern switch which I bought surplus so hopefully a source can be tracked down. It is marked Arrow H&H and has a stamped number CHH24684. I would guess that this is now make by Cutler Hammer. It is a heavy duty limit switch that turns off when pushed.

Not thinking of much use for such a switch, I only bought 5 for 25 cents each. I should have bought the box full. The switch is 11/16 by 1-1/4 by 5/8 inch deep, with a 1/2 long 0.4 (?) inch mounting nipple, so it can be adapted to fit almost anywhere. The push-button is a heavy chunk of brass that can be drilled and tapped to receive a threaded rod, or can be drilled and soldered to. It is riveted together but can be easily drilled apart to modify the innards. It is a snap-acting wiping switch just like most modern toggle switches. There is a spring-loaded push- to-toggle lever mounted in the barrel. By pushing out the pivot pin and removing the spring it becomes a bi-stable push-pull switch.

It is a little strong to be operated by a leaky pneumatic or a lever with stripped wood screws, but can be softened up a bit by shortening the toggle spring. Then the whole mess can be screwed back together with #4 machine screws and Loctite. The new switch can be a pull-on or a pull-off, depending on the orientation of the cover when it is replaced. I checked all the catalogs I have and have not found anything that would work as-is.

I would be hesitant to use anything from J.C Whitney without checking it out thoroughly first. I have bought things from them that one couldn't think could be made badly, but were. They also seem to buy seconds and sell them with the name removed. All the electrical items I have purchased from them failed prematurely. I keep their catalog for reference but will not order from them.

(Message sent Sun 18 Aug 1996, 19:28:05 GMT, from time zone GMT-0700.)

Key Words in Subject:  Push-Pull, Switch

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