Abstract An auxiliary locking device for a sliding door is disclosed, comprising a blocking member having an upward-opening longitudinal channel near its inner side for receiving the inner frame member of the sliding door channel. At least one clamping screw protrudes through threaded hole(s) in the inner side of the blocking member into the longitudinal channel, for clamping the blocking member to the inner frame member of the sliding door with the outer portion of the blocking member protruding into the sliding door channel for blocking sliding of the sliding door, thereby preventing opening of the door past the blocking member location. A rod projects from the outer portion of the blocking member for positioning along the sliding door channel above the sliding door when the device is installed, for thereby preventing the sliding door from being lifted out of its channel for removal. The outer portion of the blocking member is provided with an upward-opening channel, and the rod is L-shaped. The rod portion constituting the base of the L-shape extends through a hole passing downwardly through the outer portion of the blocking member in the channel. Spring means are provided between the rod and the blocking member for biasing the rod into the channel, whereby the rod may be lifted from the channel against the spring force to swing the rod to project from the blocking member in either direction of the channel.
An auxiliary locking device (as recited in claim 2,) for a sliding door, comprising: a blocking member having an upward-opening longitudinal channel near its inner side for receiving the inner frame member of the sliding door channel; at least one clamping screw protruding through threaded hole(s) in the inner side of said blocking member into said longitudinal channel, for clamping said blocking member to said inner frame member of said sliding door with the outer portion of said blocking member protruding into the sliding door channel for blocking sliding of said sliding door, thereby preventing opening of the door past the blocking member location; a rod projecting from the outer portion of said blocking member for positioning along said sliding door channel above said sliding door when said device is installed, for thereby preventing said sliding door from being lifted out of its channel for removal; in which said outer portion of said blocking member is provided with an upward-opening channel, in which said rod is L-shaped, in which the rod portion constituting the base of said L-shape extends through a hole passing downwardly through said outer portion of said blocking member in said channel, and in which spring means are provided between said rod and said blocking member for biasing said rod into said channel, whereby said rod may be lifted from said channel against said spring force to swing said rod to project from said blocking member in either direction of said channel.