AtD translation: camming

[Mike Jing]

P344.11-21   . . . notably The Phenomenal Dr. Ictibus and His
Safe-Deflector Hat. This ingenious piece of headgear was invented to
address the classic urban contingency of a heavy steel safe falling from a
broken purchase at a high window onto the head of some unlucky pedestrian.
“Bearing in mind that any concentrated mass is actually a local distortion
of space itself, there happens to be exactly one surface, defined by a
metric tensor or let us say equation, registered with the U.S. Patent
Office, which, incorporated into a suitable hat design, will take the
impact load of any known safe falling from any current altitude,
transmitting to the wearer only the most trivial of resultant vectors, a
brief tap on the head if that, while camming the safe itself harmlessly
away toward the nearest curbside.

What does "camming" mean here?