Casement Window Opening Control Device

A device, for use in releasably limiting an amount of pivotal travel a sash window hingedly coupled to a window frame can be rotated open from a closed position, said device comprising:

• a first arm having a first end and a second end, said first end configured to be pivotally mounted to the sash window;
• a second arm having a first end and a second end, said first end of said second arm being pivotally coupled to said second end of said first arm;
• means for selective automatic repositioning of said first and second arms into a retracted position;
• a release assembly comprising:
• a hook member having a first end and a second end;
• said hook member being configured to be movably received by the window frame to move between a first hook position and a second hook position;
• a safety button;
• and
• a spring;
• wherein said second end of said second arm comprises means for engaging said first end of said hook member;
• wherein said first end of said hook member comprises means for engaging said second end of said second arm;
• wherein said second end of said hook member comprises an opening;
• wherein said hook in said first hook position is configured for said engaging of said second end of said arm with said first end of said hook member, when said second arm is in said retracted position and the sash window is rotated back into the closed position;
• wherein when said hook member is moved into said second hook position, said first end of said hook is disengaged from said second end of said second arm, and said means for selective automatic repositioning repositions said first and second arms to said retracted position;
• wherein said safety button is received in said opening in said hook member to be movable between a first button position and a second button position, wherein said button in said first button position is configured to block said movement of said hook member when said hook member is in said first hook position;
• wherein said button in said second button position is configured to unblock said movement of said hook member, for said hook to move into said second hook position;
• and
• wherein said spring is configured to bias said safety button to slide toward said first button position and to bias said hook member to move toward said first hook position.