Sliding glass door lock

A lock for a sliding door comprising a vertically oriented elongated escutcheon having front and rear walls and having a slidable latching means for movement between an "open" and a "locked" position, said escutcheon including means for releasably retaining said latching means in both of said positions, said slideable latching means including a latching bar and a latch secured thereto to lock the sliding door, said latching bar including an elongated slot of a first width having at least one enlarged portion of a second width and a locking mechanism having a bolt which extends through said slot and is rotatably secured to said escutcheon, the portions of said bolt extending through said slot having an irregular periphery so that facing in one direction the thickness of said bolt is greater than the width of said portion of said slot of said first width, and when said bolt faces in a position rotated a predetermined angular amount from said position facing in said one direction, the thickness of said bolt is less than the width of said slot of said first width, said latching bar being disposed in a channel provided in the rear of said escutcheon with said bar being secured at both ends against lateral movement with respect to the escutcheon, said bar being mounted below a gripping means provided in said escutcheon, said gripping means comprising a recess in the upper end of the front wall of said escutcheon, said escutcheon including a rectangular plate in the rear of said escutcheon which is secured to the rearmost wall of said gripping means, said plate being spaced from the front wall of said escutcheon to provide a narrow channel in which said bar extends whereby said bar is restrained against front to rear movement with respect to said escutcheon by said front wall of said escutcheon and said plate at the uppermost end of said bar.