We have a gap in the front of the robot where we want to bring in game pieces and plan on driving onto the charge station from the side of the robot. The opening side on the robot has the minimum 6" corner bumpers and the sides have full bumpers. So, we want the intake sides to be as low as possible (as low as 1") to help with orienting the cone, but the sides to be high (2") to ease getting on the charge station. Can the 6" section run from 1" of the ground to 2" or does it have to be some sort of a parallelogram? All of the bumper would be inside the envelope of being below 7.5"
I believe the only rules on this are that the cross-section should be approximately consistent with the cross-section shown in figure 9-7, and that the entire bumper assembly must be in the bumper zone, no higher than 7.5 inches off the ground.
Unless the cross-section is significantly changed, there is no rule specifying that the bumpers have to be parallel to the floor or otherwise uniform.
With that said, if you’re planning to have your bumpers tilted like this, I would suggest cutting parallelegram pieces so that the wood can be parallel to the frame on the sides.