Lock Assembly with Multiple Locking Points and Daylatch
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Solution Overview
Problem
Existing lock assemblies for doors often lack sufficient security and usability, particularly in scenarios where multiple points of locking are required to prevent unauthorized access.
Innovation Solution
A lock assembly with multiple points of locking, including a latch, deadbolt, top shootbolt, and bottom shootbolt, which can be engaged, disengaged, and locked using a handle, daylatch handle, and lock, providing enhanced security and usability by allowing multiple modes of locking and independent operation of locking components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single locking mechanism is used, then the device complexity is reduced, but the security and reliability are insufficient
Solution Approach 1:
The locking mechanism is divided into multiple independent locking members (latch, deadbolt, shootbolts) that can be engaged independently or in combination. Each locking member provides a separate point of engagement with the door frame, creating multiple security layers without requiring a single complex locking system.
Solution Approach 2:
Multiple locking members are nested within a single lock assembly housing, with each locking member having its own actuation mechanism. The daylatch provides an additional layer of security by preventing handle operation when engaged. This nested arrangement allows multiple locking functions to be integrated in a compact form factor.
2Reliability
If multiple locking members are used, then the security is improved, but the ease of operation deteriorates
Solution Approach 1:
Multiple locking members (latch, deadbolt, shootbolts) are merged into a single integrated lock assembly that can be actuated by a single handle operation. The handle is mechanically linked to all locking members through a common actuation mechanism, allowing the user to engage or disengage all locks simultaneously with one motion.
Solution Approach 2:
The lock assembly provides multiple functions through a single device: automatic latching upon door closure, manual locking via handle, deadbolt engagement, shootbolt extension, and daylatch protection. The handle serves as a universal actuator for all locking members, and the assembly can operate in multiple modes (locked, unlocked, daylatched) depending on the engagement state of different components.
3Reliability
If the lock prevents rotation in both directions, then the security is improved, but the usability deteriorates
Solution Approach 1:
The rotational restriction is applied locally and selectively: the daylatch prevents rotation only in the direction that would compromise security (the direction that would disengage locks), while allowing rotation in the opposite direction. This selective restriction maintains usability for legitimate operations while providing security against unauthorized access.
Solution Approach 2:
The daylatch mechanism applies preliminary anti-action by preventing handle rotation in the unsafe direction before any unauthorized opening attempt can occur. When the daylatch is engaged, it physically blocks the handle from rotating in the direction that would disengage the locking members, thereby preemptively countering potential unauthorized access.
Data Source
AI summary
A lock assembly, comprising: a drive hub configured to be rotated in a first angular direction; a latch having a latch engaged position; a lock having a locked position; a first locking member configured such that, when the lock is in the locked position, the first locking member retains the latch in the latch engaged position; and a second locking member configured such that, when the lock is in the locked position, the second locking member prevents the drive hub from rotating in the first angular direction.