Created by Henry F. Phillips, the Phillips screw drive was purposely designed to cam out when the screw stalled, to prevent the fastener damaging the work or the head, instead damaging the driver. This was caused by the relative difficulty in building torque limiting into the early drivers.
Судя по всему, в нашем доме раньше жили супермены. Шурупы с сорваными головками попадаются сплошь и рядом.
P.S. “cam out” – не опечатка.