A double cylinder deadbolt lock arrangement and assembly thereof and a method of door installation of said double cylinder deadbolt lock arrangement

A double cylinder deadlock lock arrangement, said arrangement including;

• an internal housing block having an internal rotatable operable cylinder supported therein said internal housing block, wherein a controlled operable rotation of said internal rotatable operable cylinder provides for a deadlock lock unlocked position or a deadlock lock locked position when said arrangement is mounted to a door;
• an external housing block with an external key cylinder supported therein said external housing block, wherein a controlled rotation of said external key cylinder when a key is receivable within a slot of said external key cylinder provides for a deadlock lock unlocked position or a deadlock lock unlocked position when said arrangement is mounted to the door;
• and
• a deadlock control tab slidably supported within the internal housing block such that a segment of said deadlock control tab is extendible out from a peripheral edge of said internal housing block to allow for a user operable engagement with said deadlock control tab, wherein slidable retraction of the extended segment of said deadlock control tab by a user at least substantially into the internal housing block subsequently permits operable rotation of the internal rotatable operable cylinder and/or the external key cylinder when a key is received within the slot of the external key cylinder to move from a deadlock lock unlocked position to a deadlock lock locked position;
• and
• a deadlock indicator tab slidably supported within the internal housing block such that when the internal rotatable operable cylinder and/or the external key cylinder have been permitted by virtue of the extended segment of the deadlock control tab being retracted substantially into the internal housing block and subsequent rotation to provide a deadlock lock locked position, said deadlock indicator tab is adapted to at least partially extend out from the peripheral edge of said internal housing block to provide a visual and tactile indicator that the arrangement is in the deadlock lock locked position.