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Cabin Bike door
I removed the 'trigger' from 2 cordless 12 volt variable speed drills and mounted them in a hobby project box. I drilled and tapped the end(s) of the box so the trigger can now be adjusted with an bolt and lock nut. One trigger is used to adjust the "UP" speed, the other for the "DOWN" speed. Seen here with only the first trigger installed. Here we see both triggers mounted inside the box and wired (one is face down, the other face up up). The box is mounted to the rear of the firewall. I wanted to have a speed adjustment so I could fine tune the up and down speeds independently. Otherwise, the door would close faster than it would open (because of the weight of the door). The system uses 2 common 12 volt relays mounted to the rear of the firewall. One relay closes the door, the other opens the door. Then, switches are located both outside and inside the vehicle. Switches operate the relays, relays operate the doors. Relays keep the up and down circuits completely isolated from each other, required due to the configuration of the variable speed drill triggers.
I tried to keep the door latch as simple and light as possible.
Shown here assembled in the closed position. Eventually the door skin will separate the interior and exterior handles. A small magnet embedded into the lower sill holds the handle upright when the latch is open.
Shown here assembled in the open position.
Door structure parts. Lower and upper sections.
(Above) The clutch built into the door motor prevents damage to the system.
(Above) Door hinge geometry
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