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Delayed Latching Mechanism

Y-12 National Security Complex

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Technology Marketing Summary

Uncontrolled and rapid movement of equipment and people through security gates has been a major problem for security personnel. In many facilities, a simple turn of a key can open a gate, giving access to trucks and equipment entering a protected area. A simple lock does no give security personnel enough time to protect the facility by keeping the gate closed if such protection is deemed necessary. The Delayed Latching Mechanism is a rugged, hydraulically operated locking latch system that adds a time delay to the unlocking action. Access from the outside is controlled by repeatedly pumping the hydraulic lever until it locks into place, which adds a time-delay level of protection. From the inside, the mechanism can be easily unlocked.


The required pumping action provides a time-delay feature, adding a level of protection that traditional locks and latches do not provide.

Opening from the inside is still a simple and quick process.


Fully mechanical; no electricity required.

Simple, rugged design requires minimal maintenance.

Access to secured areas during emergency situations when electricity is not available.

Applications and Industries

Securing structures such as doors, hatches, or gates.

Security areas, hazardous areas, border crossings, and penitentiaries.

Places requiring limited access entry doors and gates.

Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Patent 9,033,376
Delayed unlatching mechanism
In various embodiments an apparatus is presented for securing a structure such as a door, window, hatch, or gate that moves between an open and a closed position relative to a fixed structure to provide or deny access to a compartment, a room, an outdoor area, or a facility. Various embodiments provide a delay in opening the closure of sufficient duration to frustrate a rapid activation that might be desired by a person who is attempting to pass through the closure for some illicit purpose. Typically, hydraulics are used to activate the apparatus and no electrical energy or electronic signals are employed. In one embodiment, a plurality of actuations of a hand lever operates a hydraulic pump that moves a locking bolt from a first position in which a locking bolt is engaged with a recess in the fixed structure (preventing opening of a gate) to a second position in which the locking bolt is disengaged from the recess to permit opening of the gate.
Y-12 National Security Complex 05/19/2015
Technology Status
Development StageAvailabilityPublishedLast Updated

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