Forced entry resistant sash lock also configured to snap into the meeting rail of the sash window

A forced-entry-resistant lock for a sash window comprising:

• a housing, said housing comprising:
• at least one wall shaped to form an exterior surface, and an interior surface that defines a cavity;
• an opening in said at least one wall;
• a substantially cylindrical hole in said at least one wall;
• and an interior wall positioned within said cavity comprising:
• a first engagement surface and a second engagement surface;
• a shaft, at least a portion of said shaft being substantially cylindrical and being rotatably mounted in said substantially cylindrical hole in said housing;
• a cam member, said cam member comprising:
• a hub configured to pivotally mount said cam member to said housing, to pivot about said substantially cylindrical hole in said housing between a forced-entry-resistant locked cam member position where a portion of said cam member extends out from said housing cavity and is thereat configured to engage a keeper to lock the sash window in a closed window position, a non-forced-entry-resistant locked cam member position where said portion of said cam member is still configured to engage with the keeper, and an unlocked cam member position where said cam member retracts further into said housing and said portion of said cam member is disengaged from the keeper to permit travel of the sash window;
• a cylindrical hole in said hub configured to receive said portion of said shaft;
• a first contact surface;
• and
• a second contact surface;
• a secondary cam, said secondary cam being fixedly secured to said shaft, and comprising:
• a first contact surface;
• a second contact surface;
• and
• a cantilevered arm, a distal end of said cantilevered arm comprising:
• a first engagement surface;
• and
• a second engagement surface;
• and
• wherein when said cam member is in said unlocked cam member position, upon rotation of said shaft in a first rotational direction, said secondary cam rotates with said shaft independent of said cam member, and upon continued rotation of said shaft in said first rotational direction said first contact surface of said secondary cam contacts said first contact surface of said cam member and causes co-rotation of said cam member into said non-forced-entry-resistant locked cam position, and upon continued rotation of said shaft in said first rotational direction said contact causes further co-rotation of said cam member and engagement of said first engagement surface of said cantilevered arm with said first engagement surface of said interior wall to thereby cause deformation of said cantilevered arm from an undeflected position to an inwardly deflected position, and upon continued rotation of said shaft in said first rotational direction said contact causes further co-rotation of said cam member into said forced-entry-resistant locked cam member position whereat said cantilevered arm returns to said undeflected position and forced counter-rotation of said cam member towards said unlocked cam member position is prevented by said contact between said first contact surface of said secondary cam and said first contact surface of said cam member resulting in counter-rotation-inhibiting contact between said second engagement surface of said cantilevered arm and said second engagement surface of said interior wall.