Patent ID: 8783741

Claim:
A shutter frame lock formed of thermoplastic material incorporated between a shutter frame and a mounting frame and comprising; a recess integrally formed in a first one of said frames; a one piece moulded locking member secured in a second one of said frame said locking member defining a main body; attachment extensions on said main body engageable with said second frame; a flexible resilient lock strip integrally moulded with said main body, having a lock portion interlockable with said recess in said first frame, and, lock strip arm members defining generally U-shapes in section, on both side of said lock portion joining it to said main body to permit resilient flexing of said arm members; and said locking member has integral ribs on both sides of said lock strip, said ribs defining generally convex edges with a linear intermediate edge section, said ribs engaging said first frame, and said ribs registering said shutter frame in a predetermined position when said shutter frame is swung into its locked position.