Door locking mechanism

A locking mechanism for a latch mechanism having a latch spindle turnable to move a latch bolt from its latching position, the locking mechanism comprising:

• a rotatable handle having a drive passageway therein for fitting to an adjacent end of the latch spindle;
• and
• a locking member mounted on the handle;
• and
• a retainer associated and engageable with the locking member to lock the handle against rotation;
• the drive passageway being configured to allow the handle to turn relatively to the latch spindle in opposite directions through a predetermined angle of movement, at one end of which, the handle is engageable with the latch spindle for turning the latch spindle in an opening direction to move the latch bolt from its latching position and, at the opposite end of which, the handle is in a locking position in which the locking member is engageable with the retainer and the handle is engageable with the spindle to prohibit turning of the spindle in the opening direction.

A latch mechanism comprising:

• a latch spindle;
• a latch bolt movable from a latching position to a release position in response to turning of the latch spindle;
• and
• a locking mechanism comprising
• a rotatable handle having a drive passageway therein fitted to an adjacent end of the latch spindle, and
• a locking member mounted on the handle, and
• a retainer associated and engageable with the locking member to lock the handle against rotation,
• the drive passageway being configured to allow the handle to turn relatively to the latch spindle in opposite directions through a predetermined angle of movement, at one end of which, the handle is engageable with the latch spindle for turning the latch spindle in an opening direction to move the latch bolt from its latching position and, at the opposite end of which, the handle is in a locking position in which the locking member is engageable with the retainer and the handle is engageable with the spindle to prohibit turning of the spindle in the opening direction.

A locking mechanism for a latch mechanism having a latch spindle turnable to move a latch bolt from a latching position, the locking mechanism comprising:

• a rotatable handle for fixing to an adjacent end of the latch spindle for turning the latch spindle;
• a locking member mounted on the handle;
• a retainer associated and engageable with the locking member, in a locking position of the handle, to prohibit turning of the handle and the latch spindle;
• a guide spaced from the locking position and delimiting an arc of movement of the locking member when the handle is turned from a rest position to move the latch bolt from its latching position;
• and
• an actuator for operating the locking member to permit the handle to be turned from the rest position to the locking position and the locking member to be engageable with the retainer.