Security chain lock for doors

A chain lock for doors comprising a housing secured to the interior side of a door near the free-swinging edge thereof, an extensible and retractable chain and chain latch means within the housing and adapted to be extended beyond one end of the housing, and a latch keeper assembly mountable upon a door frame adjacent said one end of the housing and adapted to lockingly engage with said chain and chain latch means when the latter is extended beyond said one end of the housing, said latch keeper assembly including a manual release element accessible from the interior side of the door when the door is closed, and said latch keeper assembly including a pivoted keeper housing on which said manual release element is mounted for entry into an inaccessible door frame chamber when the door is cracked open while said chain and chain latch means and latch keeper assembly are actively engaged.

A chain lock for doors comprising a housing secured to the interior side of the door near the free-swinging edge thereof, an extensible and retractable chain and chain latch means within the housing and adapted to be extended beyond one end of the housing, and a latch keeper assembly mountable upon a door frame adjacent said one end of the housing and adapted to lockingly engage with said chain and chain latch means when the latter is extended beyond said one end of the housing, said latch keeper assembly including a manual release element accessible from the interior side of the door when the door is closed, and said housing comprising a channel-like section on the interior face of a door having spaced parallel chain guideways therein, and a housing cover section overlying the channel-like section and said guideways and having an end substantially right angular extension adapted for securement to the free-swinging edge of a door, whereby the housing is anchored to a door in two right angular planes.

A chain lock for doors comprising a housing secured to the interior side of a door near the free-swinging edge thereof, an extensible and retractable chain and chain latch means within the housing and adapted to be extended beyond one end of the housing, a latch keeper assembly mountable upon a door frame adjacent said one end of the housing and adapted to lockingly engage with said chain and chain latch means when the latter is extended beyond said one end of the housing, said latch keeper assembly including a manual release element accessible from the interior side of the door when the door is closed, and spring means biasing said chain and chain latch means to its retracted position within said housing.

A chain lock for doors comprising a housing secured to the interior side of a door near the free-swinging edge thereof, an extensible and retractable chain and chain latch means within the housing and adapted to be extended beyond one end of the housing, a latch keeper assembly mountable upon a door frame adjacent said one end of the housing and adapted to lockingly engage with said chain and chain latch means when the latter is extended beyond said one end of the housing, said latch keeper assembly including a manual release element accessible from the interior side of the door when the door is closed, and said chain and chain latch means comprising at least one chain section and a leading end latch element secured thereto, said latch keeper assembly including a cooperating spring-urged movable keeper which interlocks automatically with said latch element when the latter is drawn from said housing and into said keeper assembly, said latch element and keeper having engaging beveled faces, and said manual release element connected to said keeper.