Some of you may have seen the electric rear window openers that are available from Japan (See video
https://www.youtube.com/watch?v=w-NSu7e0HJU), well I sourced details of the kit but it was obvious that the kit wouldn't work on Australian Minis without a few modifications to the C-pillar and rear parcel shelf. To add to this, the kit was over AUD$300 for what looked like a relatively basic set of parts so you know where this is going ... it's custom time
The setup was based around a high torque worm geared motor attached to a shaft and a lever arm.
The first step was to drill out and remove the two pins in the window latch with a 5mm drill bit
I machined some stainless pins to replace the ones drilled out (and they match the chrome colour too)
For the shaft between the latch and motor I purchased a 1/4" flexible extension shaft
I cut this shaft apart to use the flexible core under the main sheath and then machined some small steel couplers for the ends of the shaft. Then using a small piece of steel plate I made a lever arm for the top of the flexible shaft and it was all silver brazed together.
This piece slides over the custom latch pins and allow the shaft to rotate on the same axis as the outer latch pin
The motor was to be mounted to the rear parcel shelf via a custom bracket and positioned so the flexible shaft did not rub on the rear seat or the window rubber.
...and with some of the original sheath trimmed and put back over the flexible core, it neatens up the look
Once the parts were put together, it all looked like this (photo taken through the rear window opening). The black piece at the base of the shaft is a 6mm rubber flexible coupling to join the shaft to the motor.
The worm gear motor is DC, so wiring would be a simple job via a couple of DPDT switches. I used a 10RPM motor which takes approx 3 seconds to open/close the window and would give enough time to predict when the window is completely open/closed and not damage the mechanism by keeping the motor powered on for too long - as there is no auto-stop function.
Here's the bad news ... after spending something like 35-40 hours on this with multiple prototypes and fabricating (I did make all the parts for both windows), I actually decided against installing these openers but thought I'd post the pics in case someone gets inspired and wants to make a set.
_________________
-Alan
I blame my dad for my love of minis. I think I was conceived in the back seat of one
I also blame my Dad for me being 6' 1" - not really the optimum height for driving a Mini.