IPC 2013 : E05B 29/12 : operated by a curved rib.

IPC2013 > E > E05 > E05B > E05B 29/00 > E05B 29/12[2] > operated by a curved rib.
Notes[t] E01 - E06: BUILDING
Notes[g] E05B 27/00 - E05B 33/00: Locks of which the tumblers are set by pushing the key in
E SECTION E — FIXED CONSTRUCTIONS.
E05 LOCKS; KEYS; WINDOW OR DOOR FITTINGS; SAFES.
E05B LOCKS; ACCESSORIES THEREFOR; HANDCUFFS.
E05B 29/00 Cylinder locks with plate tumblers that are set by pushing the key in.
E05B 29/12 · · operated by a curved rib.