What’s It # 17 – the “remote control” for BARRETT
BARRETT is an electric pallet stacker (often called a ride-on fork-lift). There are occasions when it is handy to be able to attach a workers platform to the forks and ride up with the materials. The problem is that the controls are protected in the back. Since I am only interested in going up and down, I decided to “remote” just that one control.
I pondered the solution for a few months. My first prototype was based on a modern boat steering linkage with an outer sleeve and a thick inner cable. This worked but had two problems. First, it required that both ends of the sleeve to be fixed to something. Second, it was not slippery enough to automatically return to the neutral / center position.
Remembering the controls of the Stearman (biplane) I settled on using control tubes and a bell crank.
The system starts with a sleeve that slips over the lift control handle. I fabricated a joint so allow for the necessary pivoting motion. I used a threaded coupling so I could dismantle the device when not in use. The connecting rod runs from the control sleeve up to the wooden bell crank. This changes the direction of force out toward the front. The other end of the bell crank connects to the long pole when reaches out to just above the forks and the worker’s platform. This pole needs to be accessible when the platform is no the ground as well as when it is 16 feet in the air. (As some point, I may add a pivot joint. I have not completed the field trials yet.) For the fun of it (and to get some lathe practice in) I turned a wooden knob and attached it to the end of the long pole.





