Regarding drive-thru tellers at the bank, at what angle are those vacuum tubes so canister doesn't get stuck?

Question

I essentially want to know how that vaccuum thing is set up. I was wondering becuase if set at 90 deg then the canister would get stuck in process of getting to the teller....help!

Answer 1

The systems can be either vacuum or pressurized.

The curves must be smooth.

If you look at the canister it consists of a tube with two end caps. The diameter of the end caps is larger than the diameter of the tube. Draw an arc from the edge of the end cap to the side of the tube then to the remaining end cap. The radius of that arc is the minimum bend radius of the tubing that can be used for the curves. Technically it is the min radius of the inside surface of the tubing. A manufacturer will probably specify the radius at the centerline of the tubing. So be sure to allow some for that.

As long as the minimum bend radius of the tubing is equal or greater than the arc you drew the system should work.

Answer 2

I may be wrong, but I believe the system is pneumatic, and that pressure is involved in blowing the canisters through rather then sucking them through. Pneumatic systems like this have been in use for over 100 years. At the drive-thru, the canisters do have to traverse through 180 degrees, since they go up from the depositor and come down to the teller. I suppose the central part is a semi-circular torus, which "plexiglas tube" can be fashioned into, and then attached to 2 vertical pieces.