Patent ID: 6264255
Filing Date: 2001-07-24
Classification: E05B,E05C,Y10S,Y10T

Abstract:
A latch drive assembly comprising a pair of latch drive mechanisms each being mountable on opposite sides of a door and including means to engage with and rotationally actuate a door latch mechanism mounted within the door;each latch drive mechanism comprising a mounting plate member being a substantially flat disc having means for mounting to an outer surface of a door and including concentric bearing means for rotationally locating a drive member;the drive member comprising a substantially circular drive plate and including a cylindrical boss component projecting from the center of one face, the boss component being rotatably engaged within the central bore of the mounting plate member and the face of the drive plate overlying and in parallel contact with the outer face of the mounting plate, rotatable engagement being maintained by a washer and circlip engaged with a part of the boss extending beyond the inner rear face of the mounting plate;the boss component of the drive member further includes a concentric passage shaped to engage with a drive shaft of rectangular section for rotational actuation of the latch unit;the latch drive mechanism also includes spring means acting between the base plate member and the drive member for returning the drive member to a rotational stop position after actuation;the latch drive assembly further includes a pair of handle units, each comprising a manually graspable lever element which is rigidly fixed to an escutcheon component and means within the escutcheon component for releasably fixing the handle unit to the drive plate member by engagement with complementary means provided at the periphery of the drive plate member, rotation of the handle unit when so attached actuating the latch unit via the drive shaft, the escutcheon component of the handle unit when so attached substantially enveloping and concealing the mounting plate and latch drive mechanism.