Closure fasteners – Trippers
Patent
1997-06-17
2000-04-04
Dayoan, B.
Closure fasteners
Trippers
292335, E05B 6308
Patent
active
060451696
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
This invention relates generally to dead bolt lock sets which are employed to secure doors. More particularly, the present invention relates generally to dead bolt lock sets wherein the dead bolt is projectable to an extended position in the strike of the door.
Conventional dead bolts are typically employed alone or in combination with self-latching latch bolts to secure a doorway. The self-latching latch bolt typically has a beveled latch bolt and a spring for biasing the latch bolt in the extended position. Self-latching latch bolts provide the advantage of automatically latching the door when it is closed, and with certain lock mechanisms, automatically locking the door under such circumstances.
Conventional spring biased latch bolts, however, are susceptible to tampering to allow unauthorized access. Tools or other slim items can be slipped between the door and the door frame to engage the beveled edge of the latch and force the latch bolt back into the latch set, thereby allowing the door to be opened. III-fitting doors, or doors that warp or change over time, can become more susceptible to this form of tampering.
Dead bolts have been employed to overcome some of these deficiencies. Dead bolts typically define a squared-off end that is less susceptible to tampering than the beveled end of a typical self-latching latch bolt set. Furthermore, dead bolts are typically not spring loaded, therefore maintaining the dead bolt in an extended position until the lock mechanism is employed to retract it. In addition, dead bolts typically have a longer throw or extension of the bolt for additional locking strength. A deficiency of dead bolts is that they must typically be manually engaged. Furthermore, a dead bolt is usually paired with a self-latching latch bolt, thereby requiring an additional opening in the strike for reception when the door is in the closed position.
SUMMARY OF THE INVENTION
Briefly stated, a latch bolt set in accordance with the invention has a self-latching bolt which is projectable to an enhanced extension or projection position relative to a lock case. The latch bolt set includes a latch bolt and a trigger bolt. The latch bolt has a projected position, a retracted position, and an intermediate position between the projected and retracted positions. The latch bolt is biased to the projected position. The latch bolt is preferably adapted for engagement into a conventional door strike defining a single strike opening. The trigger bolt also has a projected position and a retracted position into the lock case. The trigger bolt is also biased to the projected position. The trigger bolt is configured and positionable so that when the door is closed, the trigger bolt engages the flat surface of the door strike and does not project into an opening in the strike.
An operator assembly retracts the latch bolt from the projected to the retracted position. The operator assembly is typically operated by a door user employing a handle or knob, but can also be operated by other well-known electromechanical assemblies. The operator assembly is further lockable by well known mechanical or electromechanical systems. The trigger bolt assembly engages with the operator assembly to maintain the latch bolt in the intermediate position when the trigger bolt is in the projected position. In a self-latching mode with the door open, the trigger bolt is in the projected position and the latch bolt is in the intermediate position.
The latch bolt is preferably constructed so that a beveled distal portion of the latch bolt extends from the door when the latch bolt is in the intermediate position. The portion of the latch bolt disposed in the latch set in the intermediate position defines a latch plate having a substantially rectilinear exterior engagement surface. The trigger bolt also has a distal beveled portion which extends from the latch set in the projected position. The edge of the door strike engages the bevels of the trigger bolt and latch bolt and drives each bolt to the retract
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Dayoan B.
Estremsky Gary
Harrow Products Inc.
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