Door key retention security system
AssigneeKey Systems, Inc.
InventorGeorge H. Eckerdt
Life of this patent
Estimating the term…
Abstract
This Door Key Retention Security System guarantees that a key used to enable operation of a powered door is retained or locked in the invention until the door is, once again, closed. Thus, it requires a person who has authorized access to the key to insert the key and properly turn it in order for a door to be opened. Then, while the door is open, the key is locked in the mechanism and cannot be removed. When the need for the door to be open is ended, the door can be closed and the key removed.
Claims27
A door key retention device for a powered door, comprising:
- a lock for the powered door, said lock having a locked position, an unlocked position, and a key for moving said lock from a locked position to an unlocked position when it is inserted in said lock, which key can be withdrawn from said lock when the lock is in the locked position, but cannot be withdrawn from said lock when the lock is in an unlocked position, the door being provided with power so that it can be opened and closed only when the lock is in the unlocked position;
- and
- apparatus preventing the lock from being returned to the locked position unless the door is closed.
A door key retention device for a powered door, comprising:
- a lock for the powered door having a turnable barrel, the barrel having a slot for insertion of a key and being turnable by said key from a locked position where the key can be withdrawn from said slot to an unlocked position where the key cannot be withdrawn from said slot, the door being provided with power so that it can be opened and closed only when the barrel is turned to the unlocked position;
- and
- apparatus preventing the barrel from being returned to the locked position unless the door is closed.
A door key retention device for a powered door, comprising:
- a lock for the powered door having a turnable barrel, the barrel having a slot for insertion of a key and being turnable by said key from a locked position where the key can be withdrawn from said slot to an unlocked position where the key cannot be withdrawn from said slot, the door being provided with power so that it can be opened and closed only when the barrel is turned to the unlocked position;
- and
- an electrically actuated solenoid plunger preventing the barrel from being returned to the locked position unless the door is closed.
Dependencies are inferred from the claim text.