Sofa-bed continued:
I need a way to drive the square tube and it's newly attached metal angle back and forth which will also move the Seat Platform when done.
I'm going to use a Firgelli Automations 12" Stroke 150lb Force Linear Actuator. $119.99.
Link to product's web pageI have no particular knowledge about this company or it's products. Just did a Google search and found them. Also searched out some (hopefully) independent reviews that liked their actuators.
I choose this model since I want the Seat Platform to move 12" and this actuator has a "stroke" of 12". This isn't the first actuator I bought for the sofa-bed. The one in the original plan had a stroke of 18" but that didn't work out so I went with this one. I'm planning to now use the 18" on a TV lift.
These actuators use just two wires. Apply power one way and the actuator will run out to max length then stop on it's own. Reverse the polarity on the wires and piston runs in until it stops. You don't have to kill the power. The actuator has it's own internal limits switches. The piston can't be moved manually. It will only move electrically. Max power draw is only 4 amps.
Since I'll be testing the actuator a fair amount I attached a pair of round male quick disconnects to the wires along with some shrink tube.
I'll provide power to the actuator using a single 6 volt battery. Even though it's rated at 12 volt I found it runs just fine with 6 volts. That is it runs OK without any load on the actuator to speak of. Attach a pair of round female disconnects to the battery.
Power it up and marvel as you drive it in and out several times.
Drill a hole at the front edge of the Center Support to create an attachment point for the mounting hole on the motor end of the actuator.
Use a 1/4" bolt to anchor the mounting point.
Now stare at the mounting hole on the end of the piston and ponder out how I'm going to attach the piston to the square tube. Then ponder some more.
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