Patent ID: 8066309
Filing Date: 2011-11-29
Classification: E05C,Y10T

Abstract:
1. A latch including: a casing adapted to be fixedly mounted in a door; a carriage mounted in the casing and adapted for slidable movement relative to the casing between an actuated position and a return position; a first spring biasing the carriage to the return position; an actuator for driving the carriage to the actuated position; a lock bolt mounted to the carriage and biased to protrude from the casing when the carriage is in the return position; a lock bolt assembly in which the lock bolt is adapted for slidable movement relative to the carriage between a rest position and an engaged position and in which a second spring is provided to bias the lock bolt towards the rest position; and a master cam and a slave cam each pivotally mounted to the casing such that the master cam directly acts upon the slave cam with a non-meshing, rolling action, whereby the master cam can pivot in both a clockwise and counterclockwise direction, and wherein pivoting actuation of the master cam in both of the clockwise and counterclockwise directions drives pivoting actuation of the slave cam which in turn actuates sliding movement of the carriage from the return position to the actuated position, both the master and slave cams mounted to the casing for pivoting about axes that are substantially perpendicular to the sliding movement direction of the carriage, the master cam including opposed cylindrical bosses which are slidably received in respective opposed obround recesses in the casing to allow for selective float movement of the master cam axis in the carriage sliding movement direction; wherein the carriage at least partially extends over the slave cam but not the master cam; wherein when the carriage is in the actuated position, the bolt is sufficiently retracted to enable the door to be opened and pivoting actuation of the master cam through at most 35° is sufficient to move the carriage to the actuated position.