Rear seat tilt lockout prototype is almost done. I first made the pivot, then figured I needed a lockout of course. So I made the lockout arm with a 1.500 Delrin spud that locates in the next smaller hole in the seat bracket. I was hoping to use the existing slot in the base bracket but I was not 100% sure it would line up with the lockout arm hole. It's doesn't, no big deal.
When the seat is tilted to where the front of the seat is touching floor, the pin hole in the lockout arm is only 1/2 way exposed in the base bracket slot. This was a know possibility I was not real worried about. My fix, you can see where the corners of the lockout arm are at the edge of the base bracket, you see the circle, thats where I'm going to drill a 1/2 in hole and a push button ball lock pin will engage into. It's actually better then using the slot cause it keeps the seat about 1" off the floor. Less wear & tear on the seat. Going to drill a hole on both sides of the slot so I can use this bracket on both sides so theres no right or left bracket, it's universal.
There is a 3/4 diameter OD X 1/2 ID bushing inside the lockout arm that it pivots on. The lockout arm it .535 thick, the bushing is about .020 wider then the arm. The seat pivot needs to be tight in the in the slot in the uper most posistion. In order to do this and still have the arm pivot the bushing has to be a little wider to allow the bolt to tightet but still allow the lockout arm to pivot. Why .535? I just grapped material and started machining, no particular reason for it. I knew I didn't want to use 1/4 like the base bracket. Wanted some material thickness for a bushing and thicker material wouldn't flex.
Few changes are going to be of course a more correct length bolt, I used what I had for the pics. Actually the one on the try is the correct bolt length. I also have a thin stainless steel washer between the base bracket and lockout arm. I'm going to machine a Delrin washer the same width as the lockout arm (1.500 dia.) about .060 thick, same as the stainless washer inbetween there already. Also the 3/4 bushing is a piece of DOM steel tubing, I'm machining a stainless steel bushing up so it wont rust. Well have grade 8 washers instead of the black oxide you see in the pic. Just grabbed something to use for the pics.
What do think? Pretty simple design, I'm pretty happy with it.
