Abstract: A connecting adaptor for an electric cylinder to operate a door lock is provided having a screw type connecting member assembly D1 comprising a screw type connecting member 2, in which a cam bar 4, a cam bar extruding plates 5, and a cam bar return spring 6 are incorporated, is screwed into an internal thread portion C1 of an existing lock case C of a door, that a connecting plate assembly D2 comprising a connecting plate 3, in which a locking pin 7 and a locking pin return spring 8 are incorporated, is secured to the electric cylinder 1 with connecting plate fixing screws 9, that a projection (a) at the lower end of the connecting plate 3 secured to the electric cylinder 1 is inserted into a square hole b2 of the screw type connecting member 2, that a screw C6 is fastened into the lock case C with a screw driver C7, so that on one hand, the stop of rotation of the screwed screw type connecting member assembly D1 is made, and on the other hand, the electric cylinder 1 is fixed in such a manner that the cam ex

Abstract: In a locking system constituted by a housing, a slider provided in the housing and including magnetic lock pins, and a pair of plates provided in the housing so that a magnetic card key can be inserted between the plates, a lock setting changing unit is configured such that a disc rotatable to change magnetic lock setting is inserted into at least one circular recess portion of a slider, the disc is provided with engagement means for preventing a setting tool from being relieved in the middle of changing the magnetic lock setting, the setting tool is inserted into a center hole of the rotatable disc, and after the disc is rotated by the setting tool so that the magnetic lock setting can be changed into a new magnetic lock setting position, the setting tool is allowed to be relieved from the disc.