Mortise lock having secured stops

A lock to be mounted at a free edge of a hinged door for affixing the door to the doorframe, the lock having means for receiving at least one handle and a key-operable lock cylinder accessible at a face of the door, a latchbolt and a deadbolt extendible from an edge of the door to engage the doorframe, and at least one manually-movable control stop accessible at the edge of the door for controllably enabling an operating characteristic of the door, the lock comprising:

• a deadbolt linkage connecting said lock cylinder and said deadbolt, the deadbolt being retractable by operating the lock cylinder using a key;
• a latchbolt linkage connecting said means for receiving at least one handle to said latchbolt, the latchbolt linkage being engaged by said control stop when said operating characteristic is set;
• and,
• a connecting linkage between the deadbolt and the control stop, the connecting linkage blocking movement of the control stop when the deadbolt is fully extended and when the deadbolt is fully retracted, the connecting linkage having an intermediate position free of the control stop when the deadbolt is partly retracted, whereby said operating characteristic can be enabled and disabled only by operation of the deadbolt.

A mortise lock comprising:

• a casing with key cylinders on opposite sides;
• a deadbolt in the casing, the deadbolt being extendable from an edge of the casing and spring biased to fully extend and fully retract, the deadbolt adapted to engage a doorframe when extended;
• a latchbolt in the casing, the latchbolt being spring biased to fully extend through the edge to engage the doorframe;
• a split spindle extending through the casing and having relatively rotatable opposite ends for carrying handles;
• a spindle hub for each of the two ends of the spindle, the spindle hubs having eccentric means for engaging and retracting the latchbolt, one of the spindle hubs having a stop cooperating with an eccentric means on the spindle hub for receiving the stop, the stop being movably mounted at the edge of the casing;
• a linkage attached to the deadbolt and positioned by the deadbolt to block movement of the stop when the deadbolt is retracted and when the deadbolt is extended, the linkage allowing movement of the stop when the deadbolt is positioned intermediate extension and retraction.