Cylinder locks

A cylinder lock comprising two barrels in axial alignment, each barrel being formed as two opposed elements disposed on either side of a longitudinal plane, a web between the barrels and engageable with internal end parts of the barrel elements, the barrels being in alignment on either side of the web and each barrel comprising tumblers received in the barrel and operable by a key engageable in a longitudinal keyhole slot in the barrel, the keyhole slot lying in said longitudinal plane and confronting surfaces of said opposed elements forming the keyhole slot, a lock block formed in one piece and comprising a central recess through which the web is able to pass and two parts of generally rectangular cross section on either side of the central recess, each having a narrow top surface contiguous with one of the barrels pins received in bores in the lock block extending to the latter surfaces, the pins being spring-biased so that the pins normally engage in recesses in the barrels to lock the same when the key is absent, and two housing members each engaging over one of said rectangular parts and the corresponding barrel to maintain the barrels in contact with said parts.