Granted Patent B2

US 12,650,033 · App. 18/289,107 · Granted Jun 9, 2026

Inventors: Suban Ariaratnam (Toronto, CA); Christopher Griffin (Groton, CT); Robert Christie (South Glastonbury, CT); Jason Sorrentino (Haddam, CT)

Assignee: Roto Frank of America, Inc.

E05B65/0841E05B65/087E05C3/045E05C3/046E05C2007/007

Abstract

Claims (33)

1 . A system comprising:

a sash lock configured for installation on a rail of a window sash, the sash lock including a cam that is rotatable to engage or disengage a keeper to lock or unlock the window sash, the cam including a slot having an enlarged opening and an arc-shaped portion, wherein a width of the arc-shaped portion is smaller than a diameter of the enlarged opening; and

a latch assembly including a latch bolt with a enlarged-shaped head that is sized to fit through the enlarged opening of the slot but has a diameter larger than the width of the arc-shaped portion of the slot, the enlarged-shaped head held in the slot while a tip of the latch bolt is adjacent to a surface of a stile of the window sash.

2 . The system of claim 1 , wherein:

the cam is rotatable to a lock position and an unlock position;

in the lock position, the cam engages the keeper;

rotating the cam from the lock position to the unlock position disengages the cam from the keeper; and

during rotation of the cam between the lock position and the unlock position, the tip of the latch bolt remains extended from the surface of the stile and the slot slides relative to the head of the latch bolt wherein the head of the latch bolt rides freely within clearance of the arc-shaped portion of the slot.

3 . The system of claim 2 , wherein:

the cam is further rotatable to a tilt position;

rotating the cam from the unlock position to the tilt position causes an end of the slot to contact the latch bolt and retract the tip of the latch bolt into the stile, wherein the latch bolt head can only be inserted into or removed from the slot when the cam and latch bolt are positioned so that the head coincides with the enlarged opening in the slot.

4 . The system of claim 3 , further comprising:

a spring system biased to rotate the cam from the tilt position to the unlock position when no external pressure is applied to rotate the cam to the tilt position.

5 . The system of claim 1 , wherein the sash lock further comprises:

a housing containing the cam; and

a handle above the housing, the handle and the cam being coupled to rotate together relative to the housing.

6 . The system of claim 5 , wherein: a shape of the slot follows an arc about a rotation axis of the handle and the cam.

7 . The system of claim 1 , wherein the latch assembly further comprises:

a latch bolt housing in which a first portion of the latch bolt resides;

a clip affixed to the latch bolt housing and extending through an opening through the latch bolt; and

a spring in the opening and having a first end abutting the latch bolt and a second end abutting the clip.

8 . The system of claim 7 , wherein: the spring is biased to rotate the cam from a tilt position to an unlock position and the tip of the latch bolt to protrude from the stile when no external pressure is applied to rotate the cam to the tilt position.

9 . The system of claim 1 , wherein: the latch bolt is a one-piece structure.

10 . The system of claim 9 , wherein the latch assembly further comprises:

a latch bolt housing that anchors in the stile, the latch bolt having a slide portion from which the tip extends and an extension portion extending from the slide portion to the head of the latch bolt, the slide portion being slidably mounted in the latch bolt housing.

11 . The system of claim 10 , wherein: the extension portion of the latch bolt flexes to allow the head of the latch bolt to follow a contour of the slot when external pressure forces the tip to retract and the slide portion to slide in the latch bolt housing.

12 . The system of claim 1 , wherein: the latch bolt flexes to allow the head of the latch bolt to follow a contour of the slot when external pressure forces the tip to retract into the stile.

13 . The system of claim 1 , further comprising:

a second latch assembly including a second latch bolt engaged with the sash lock, the second latch bolt having a tip adjacent to a surface of a second stile of the window sash.

14 . The system of claim 1 , further comprising:

the window sash, the sash lock being on the rail of the window sash and the latch assembly extending through the stile of the window sash;

a second sash lock installed on the rail of the window sash, the second sash lock including a second cam that is rotatable to lock or unlock the window sash, the second cam including a second slot; and

a second latch assembly including a second latch bolt with a head held in the second slot while a tip of the second latch bolt is adjacent to a surface of a second stile of the window sash.

Continuity (2)

References Cited (18)