Double latch dead bolt lock operating mechanism
AssigneeJuralco, Inc.
InventorsBirk Sorensen, Kent Martins
Life of this patent
Estimating the term…
Abstract
An improved double latch dead bolt lock operating mechanism wherein the dead bolt has a keyway engaged by a key for guiding the latching and unlatching movement of the dead bolt but allowing vertical movement of the dead bolt for accommodating any undesired engagement of the operating cam with an improper portion of the dead bolt. The dead bolt is resiliently urged vertically toward the operating cam to return the dead bolt to its normal vertical position after the cam to passes that improper portion of the dead bolt.
Claims11
In a dead bolt lock operating mechanism having a housing for mounting in a door frame, a dead bolt mounted in the housing for latching and unlatching movement, a cam rotatably mounted in the housing for engaging the dead bolt upon selective rotation of the cam to cause latching or unlatching movement of the dead bolt, and a latch for latching the dead bolt in unlatched and latched positions, an improvement comprising,
- the dead bolt and the housing having a cooperating means causing guided latching and unlatching movement of the dead bolt and allowing limited movement of the dead bolt in a direction toward and away from the cam,
- the latch having means for engaging cooperating means on the housing for latching the dead bolt to the housing,
- means for biasing the latch in a latching direction and both the latch and the dead bolt toward the cam for allowing the limited movement of the dead bolt relative to the cam for the cam to pass, by engaging and moving the dead bolt in said direction of said limited movement, interfering portions of the dead bolt and resiliently returning the dead bolt to a normal position during the selective rotation of the cam for latching and unlatching the dead bolt.
In a dead bolt lock operating mechanism of the double latch type having a housing for mounting in a door frame, a dead bolt slidably mounted in the housing for horizontal latching and unlatching movement, a cam rotatably mounted in the housing for engaging, upon selective rotation, two separate locations on the dead bolt upon successive rotations of the cam in one direction to use two separate latching or unlatching movements of the dead bolt, and a latch movably mounted in the housing for latching the dead bolt in three positions of unlatched, intermediately latched and fully latched, the latch being engaged and released by the cam during the selective rotation, an improvement comprising,
- the dead bolt having a keyway, extending horizontally in a direction of the latching and unlatching movement,
- the housing having a key extending horizontally in the latching and unlatching direction and projecting into said keyway for guiding the horizontal movement of the dead bolt,
- the latch being mounted on the dead bolt for vertical movement with means for selectively engaging cooperating means on the housing for latching the dead bolt to the housing in the three positions,
- a pair of compression coil springs mounted in the dead bolt to extend vertically between the latch and said key for biasing the latch in a latching direction and biasing both the latch and the dead bolt vertically toward the cam, and
- said keyway and key being of cooperating shapes and dimensions for allowing substantial but limited vertical movement of the dead bolt relative to the cam for in turn allowing the cam to pass, by engaging and vertically moving the dead bolt, interfering portions of the dead bolt that the cam engages during the selective rotation of the cam for latching and unlatching the dead bolt.
Dependencies are inferred from the claim text.