hooks 68 of lock base 14 and bolt slot 95 is arranged to receive latch bolt 18 as shown in fig4 7 lock housing 12 and keeper 22 and their respective components and structures can be constructed of a variety materials including plastics metals and other known materials fig1 21 depict various operational configurations for the components of lock mechanism 10 in use lock mechanism 10 is mounted on a window assembly 25 that can include sliding sash 26 and other sash 27 lock housing 12 is mounted on sliding sash 26 opposite keeper 22 via fastening apertures 70 with keeper 22 mounted on stationary sash 27 via fastening apertures 96 when sliding sash 26 is open lock housing 12 and keeper 22 are disengaged as shown in fig1 and 20 in this configuration lock mechanism 10 is in the unlocked position whereby pull 76 is pulled back such that bolt 18 is retracted back into the lock base 14 and out of bolt slot 95 of keeper 22 accordingly sliding sash 26 can be slid away from stationary sash 27 and hooks 68 of lock base 14 can disengage from hook slots 94 of keeper 22 when the sliding sash 26 is moved into a closed position lock housing 12 engages keeper 22 as depicted in fig1 15 and 18 19 in this position bolt 18 is initially in the retracted position within lock base 14 and at least the front end portion 30 of trigger 16 extends out from front wall 72 of lock base 14 trigger pivots 36 abut portions of respective base guides 64 in addition bolt catch 50 is captured by trigger catch 39.