| 摘要 |
A lock for a door (10) has a casing (11), a blot (55), a pivoted operating handle (36) operable to retract the bolt, and lock means comprising a lock cylinder (39). The lock cylinder (39) is secured to the housing by a screw (38g) covered by a rose (110) around said part of the housing, the rose being secured in place by fixing screws (38h) which can only be accessed upon removal of the casing assembly from the door and with the bolt in a refracted position. In this state the shank of the screwdriver to undo each fixing screw can easily be passed through respective aligned openings in a cover plate (12) of the housing assembly, the bolt (55), and the housing (38), thereby allowing removal of the rose and subsequent replacement of the cylinder (39) without the need to remove components of the door lock itself.
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