3797169 is referenced by 24 patents and cites 6 patents.

A hinge for pivotally supporting a window sash for angular opening and closing movement relative to a window frame, including first and second links pivotally mounted on the window frame and pivotally connected to the window sash, a friction device slidably mounted on the window frame independent of the pivotal mounting of the first and second links on the window frame, a third link pivotally connected to the friction device and pivotally connected to one of the first and second links so that the friction device retards movement of the sash, and coacting cam means including a roller mounted on the window frame and a cam yoke on the window sash operable to hold the sash closed and also arrest inward movement of the sash as it is swung toward open position. A pair of hinges are required along opposite edges of a sash.

Title
Window hinge
Application Number
05/299,107
Publication Number
3797169
Application Date
October 19, 1972
Publication Date
March 19, 1974
Inventor
Armstrong Henry P
Agent
Hofgren Wegner Allen Stellman & McCord
Assignee
Truth Incorporated
IPC
E05d 15/40
E05D 15/40
E05D 15/46
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