Mortise lock resistant to blunt force attacks

A lockset for a sliding door or a double door, the lockset comprising:

• a lock body with a cam post and a scalp plate;
• a bolt movable between retracted and projected positions with respect to the lock body;
• a catch incorporated into or carried by a lever that is at least partially housed within the bolt and that, when the bolt approaches the projected position, automatically extends out of the bolt to lockingly engage a door frame or an opposite door of a sliding double door;
• and
• a contour along the lever, the contour comprising a glide edge segment and a first convex section forward of a concave section which itself is forward of a second convex section, wherein:
• as the bolt is just beginning to retract from the projected position, the first convex section cams against the cam post, forcing a withdrawal of the catch from its lockingly engaged position;
• as the bolt retracts further, the glide edge segment comes into contact with an upwardly facing edge of a scalp plate aperture, which supports the catch from drooping due to gravity;
• and
• as the bolt retracts even further, the glide edge segment retreats behind the scalp plate aperture and comes into contact with the cam post, so that the cam post replaces the upwardly facing edge of the scalp plate aperture as a support for the catch to prevent it from drooping low enough to potentially cause the lever to jam against the scalp plate when an attempt is made to project the bolt;
• as the bolt projects into a bolt receptacle of a door frame or opposite door, the concave section and/or the second convex section cams against the cam post, forcing the catch into locking engagement with the door frame or opposite door.

A mortise lockset for a sliding door or a double door, the mortise lockset comprising:

• a mortise body;
• a thumbturn;
• a cam post;
• a bolt with a slot;
• and
• a lever incorporating or carrying a catch configured for movement between an inactive position withdrawn into the bolt slot and an active position extending out of the bolt slot and into a complementary aperture of a door frame or of a second door;
• a retract slide that carries the bolt between the retracted and projected positions and that is operatively connected to the thumbturn;
• a tail of the thumbturn coupling the thumbturn to the retract slide;
• and
• a channel formed in the retract slide into which an end of the thumbturn tail resides throughout all positions between retracted and projected of the bolt, wherein:
• the thumbturn, when operated, forces the retract slide to move into the projected position to lock a door in which the lockset is installed, or to move into the retracted position to unlock the door;
• when the bolt is fully projected, the thumbturn tail end is placed in opposition to a forward side of the channel;
• and
• when a blunt force attack is made against the lockset to force the fully projected bolt to retract, the attack is impeded by the thumbturn tail end against a wall of the channel.