|Seatbelt magic resides in the holes.|
A piqued interest of my youngest daughter in riding the Big Dummy recently hastened seatbelt improvements. She is now about 15 months old, and although she has enjoyed riding in our old Burley trailer, she wants to do what the big people are doing and has very recently become very energized about riding on the Dummy. She did a few rides with the old seatbelt system, but it seemed that a five-point harness was in order.
I didn't want for screw heads or other hardware protrusions to stick out of the areas where her body would be in contact, so I devised the following system using easy-to-source webbing and Fastex-type fasteners. There is perhaps some detail missing below, but this is a new development and still in the process of being honed. As I get it dialed in, I'll post more photos.
Here we go. I used a one-inch diameter drill bit to make holes through which I inserted 3/4-inch webbing. Note that I would have preferred to use one-inch webbing, but 3/4 was what I had on hand. depending on how things work out, I may reconfigure the webbing, which shouldn't be a big deal. In any case, the procedure follows.
|Pilot holes first. For the shoulder straps, I drilled two holes six inches apart on center, centered across the backrest. Each hole is 2 1/2 inches down from the top of the backrest.|
|After drilling the pilot holes, I drilled with the 1" bit part of the way through the back...|
|...and the rest of the way through the front so as not to rip up either the front or back face of the wood upon exit.|
|For the seat belt, I located the hole center about 2 1/2 inches above the deck surface, centered laterally on the side panel. Same drilling procedure as above.|
|Drilling the anchor bolt hole. Anchor bolt is in the foreground.|
|Anchor strap installed. Note the position of the d-ring. It's easiest to drill the webbing when it is sandwiched between two scrap pieces of wood. Making the anchor strap adjustable might have been nice, but is not entirely necessary.|
|Underside of the anchor bolt.|
|I measured and cut a slit in the foam pad through which to work the anchor strap.|
|A view from the back. Note the back of the seatbelt runs behind the seat, and the shoulder straps loop through the backrest. The goal of no hardware protruding into the passenger space has been met.|
If this all seems like a lot of effort, well, it is to a degree. However, I personally consider the ability to safely carry passengers the defining element of my Big Dummy experience. Carrying kids and cargo has radically reshaped my biking life and made for some of the best times I've had on two wheels.