Security lock arrangement

A security lock arrangement which includes:

• a carrier to be mounted on a wing member;
• at least one latch bolt displaceably arranged relative to the carrier between a retracted, unlocked position and an extended, locked position;
• an urging means acting on the at least one latch bolt for urging the latch bolt to its extended, locked position;
• a displacement mechanism for displacing the at least one latch bolt at least to its retracted, unlocked position against the action of the urging means;
• a holding assembly for holding the at least one latch bolt in its retracted position;
• and
• a non-contact, proximity detection unit for determining when the wing member is in its closed position relative to a surround of the wing member, the proximity detection unit, upon detecting that the wing member is closed, acting on the holding assembly to cause the holding assembly to disengage the at least one latch bolt so that the at least one latch bolt moves to its extended, locked position under the action of the urging means.

A security lock arrangement which includes:

• a carrier to be mounted on a wing member;
• at least two latch bolts extending in opposite directions displaceably arranged relative to the carrier between a retracted, unlocked position and an extended, locked position with each latch bolt having a carrier associated with it, each carrier being in the form of a carrier plate mountable to an operatively inner surface of the wing member;
• an urging means acting on the at least one latch bolt for urging the latch bolt to its extended, locked position;
• and
• an operating mechanism which acts on the at least one latch bolt to withdraw the latch bolt from its locked position to its unlocked position, the operating mechanism comprising, in combination, a handle mountable on one side of the wing member and a key lock mechanism mountable on an opposed side of the wing member, the key lock mechanism including a barrel in register with a rotational axis of the handle, the barrel and the handle being connected by a link, the link including a lost motion component to allow the barrel and the handle to operate, at least partially, independently of each other.