Security lock for a sash type window
OwnerBarry G. Lawrenceinventor
Life of this patent
Estimating the term…
Abstract
A security lock for sash windows includes an elongated cam that revolves in order to engage a keeper. The security lock also includes a tab that urges the cam against a wall of a housing to provide extra security. Once the cam contacts the housing wall it will not rotate to open as occurs in conventional sash locks. A groove and a race within the top inside of the housing direct a guide affixed to the top of the cam a), initially in a circular direction, and b), finally into a lateral direction into engagement with a locking stud on the wall of the housing. A rotating tab affixed to the handle axle causes the final cam movement during the locking process.
Claims20
A lock comprising:
- a housing, said housing including an indent, a race, and a locking stud extending inward from a side wall of the indent adjacent to a terminal end of the race, a cam, said cam positioned within said indent, said cam defining a well,
- a rotatable tab,
- an axle,
- said tab mounted on said axle within said well,
- whereby upon rotation of said axle, said tab revolves to urge said cam into a locked posture against said housing, and wherein said tab is pivotable by more than 180° from an unlocked position to a locked position within said well.
A lock for a window sash comprising:
- a housing, said housing defining an indent,
- a rotatable and slideable cam, said cam including a well entirely surrounded by a wall formed on a bottom side of the cam, and an elongated axle port extending from a top side to the bottom side of the cam,
- an axle,
- said axle positioned within said axle port to allow said cam to selectively rotate and slide within said indent, said cam includes a first rounded lobe and a second rounded lobe formed in said wall that receives a rotatable tab therein, said tab is mounted to said axle, whereby upon rotation of said axle, said tab revolves to urge said cam into a locked posture against said housing.
In a locking system for a sash type window in which a keeper mounted on a window frame is engageable with a lock mounted on a window sash to selectively immobilize sash movement, the improvement comprising:
- a lock, said lock comprising a housing, said housing defining an indent,
- a cam, said cam positioned in said indent for rotation into engagement with said keeper, said cam defining an elongated axle port,
- an axle, said axle contained within said axle port, said cam further defining a well,
- a tab, said tab attached to said axle and contained within said well, said tab for urging said cam along said axle port into contact with said housing and into engagement with said keeper to prevent sash movement,
- wherein rotation of the tab urges a locking stud of the housing into a locking stud notch formed on a curved outer edge of the cam.
Dependencies are inferred from the claim text.