Restraining Device for an Under-Seat Container Suitable for Peugeot Traveller, Citroen Spacetourer, Opel Zafira Life, Toyota ProaceVerso etc.

Hello all,

underneath my new car's (2026 Peugeot Traveller) front row seats, there is quite some space. To fill this space with some utensils, a container box would be perfect.
One box that fits well enough without chaving the seat's cables is this one: Keeeper "Cornelia", size 7 Liter, article number: 1094482700000 or direct link:
https://www.amazon.de/dp/B0B8N6WXJJ

The problem now is: The box may slide from underneath the frontrow seat towards the pedals if you brake too hard - at best this is annoying, but worse - it is dangerous if the box blocks the driver's pedals.

To correct this, some the basic requirements had to be found:

• a device that keeps the container boxes from sliding around
• the device must be attachable without glueing, drilling into the car's frame, however still sturdy and firmly enough
• for restraining and releasing the container box: Mechanism must be easy enough to lock and unlock without any tools, like screwdrivers, etc.
• sturdy enough to hold back heavy container boxes

The design consists of 2 parts.

1. The bracket for seat-frame attachment
2. The lever for keeping the containerbox from sliding to unwanted positions

Both 1. and 2. are interconnected by a 22-25mm M3 bolt+ nyloc nut + washers.

The usage is kind of self explanatory - it has a locking mechanism with a springloaded pin, that locks into the lever, when pushed down hard enough (a solid click). To release, you need to apply a forward directed force to bend the pin enough so the lever can be lifted. The pin can't be overstressed, because it is physically restricted by the lever's pinhole.

The bracket is designed a bit too tight intentionally. The arc that interconnects both of the bracket's legs takes most of the bending force/tension. The whole bracket is bent outwards by about 3 degrees. This 3degree angle seemed to be the sweetspot between firmly grasping the metal frame and releasing the bracket again, if not needed anymore. The front side of the bracket is pulled a bit lower than the backside, to make it easier to release the bracket from the metal frame by your thumbs/hands.
The lever and bracket are designed by using slopes and large radius curves, to enforced the plastic parts where needed.

In the picture slides, you can see the crossection of both the bracket and the lever. You'll notice the collision of the pinnacle's nose with the lever. When the bracket is clasped around the metal frame, it widens about 3 degrees, so the pinnacle moves a bit up & rotates slightly. This is important, because it then slides perfectly into the latching lever.
(yes, this was the most annoying part of this "agile" design process here...i'd rather not tell the amount of dummy brackets and broken pins during the process that went straight to the dumpster, sometimes accompanied by some cursing of course ;) )

To make all parts sturdy enough, you need to print both parts with 4 perimeters at least plus 100% infill. Also it is important to print both parts laying on the printbed sideways as shown in the prusaslicer view to make the locking pin and the bracket sturdy enough bc. of the way the filament lines can take the torsion forces.
A few supports are required as shown - mainly for the pin and the joint.

You may need to print 2 sets per seat to have some sort of redundancy in your car.

This design might get a revised at a later time, in case the testing phase during hot shows some mechanical fails. Use it at your own risk - especially for the box that is restrained from under the driver's seat!

Happy printing,
Hannes