Roller Shutter Lock Assembly Automatic Bolt Actuation
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Solution Overview
Problem
Existing roller shutter locking mechanisms, such as keyed locking bars, are aesthetically unpleasing, hinder operation, require manual actuation, and increase noise due to rattling, while also necessitating key access and potential jamming issues.
Innovation Solution
A shutter locking assembly featuring a bolt carriage, a sliding locking bolt, and a single leaf spring actuator that moves the locking bolt between extended and retracted positions within a shutter slat cavity, engaging with a locking bolt receiving opening in the guide rail, allowing for automatic locking and enhanced security without manual key operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a keyed locking bar is used in the bottom rail, then security is improved, but aesthetic appearance deteriorates and operational ease worsens due to the projecting handle abutting against the window frame
Solution Approach 1:
The locking mechanism is extracted from the bottom rail and relocated to the side guide rail. The locking bolt is positioned laterally within the guide rail cavity rather than projecting from the bottom rail, eliminating the obstruction to full shutter opening while maintaining security functionality.
Solution Approach 2:
Instead of having the locking mechanism project outward from the shutter (as in conventional keyed locking bars), the invention inverts the arrangement by positioning the locking bolt within a cavity in the side guide rail, making it recessed rather than projecting.
2Reliability
If a keyed locking bar is used, then security is improved, but device complexity increases due to the need for manual key actuation
Solution Approach 1:
The locking mechanism is designed to operate automatically based on shutter position. The leaf spring mechanism self-actuates to extend the locking bolt when the shutter is closed and retract it when opened, eliminating the need for manual key insertion and rotation.
Solution Approach 2:
The locking action is performed automatically as the shutter reaches the closed position, before any user intervention is needed. The leaf spring pre-charges and automatically engages the locking bolt with the guide rail opening when the shutter is lowered.
3Reliability
If a keyed locking bar is used, then security is improved, but noise increases due to the locking bar rattling within the bottom rail
Solution Approach 1:
The locking bolt is extracted from the bottom rail environment where rattling occurs and relocated to the side guide rail cavity. This positional change eliminates the loose fit and rattling noise while maintaining the security engagement function.
4Reliability
If a keyed locking bar is used, then security is improved, but ease of operation worsens due to the requirement for key access
Solution Approach 1:
The system serves itself by automatically locking when closed and unlocking when opened. No external key or manual actuation is required - the shutter's own movement actuates the leaf spring mechanism to engage or disengage the locking bolt.
5Reliability
If the locking bolt is extended to engage with the guide rail, then security is improved, but the shutter cannot be fully opened due to the bolt obstructing the path
Solution Approach 1:
The locking bolt is designed to be dynamic rather than fixed - it automatically extends to engage security when the shutter is closed, and automatically retracts to allow full opening when the shutter is opened. The leaf spring provides the dynamic actuation based on shutter position.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a quiet, aesthetically pleasing, and secure locking mechanism that automatically engages when the shutter is closed, requiring minimal user intervention and significantly increasing the force needed to open the shutter, thus enhancing security and operational ease.
Implementation Method 1
the locking bolt being movable between an extended position and a retracted position by action of the single leaf spring within the shutter slat cavity
Data Source
Figure 1
Figure 2A~2B
Figure 2C
AI summary
A shutter locking assembly that has a bolt carriage with a bolt slidingly engageable with the bolt carriage and a biasing (actuator) means operatively connected to the bolt member and the bolt carriage. The bolt carriage is inserted into a cavity of a shutter slat, and the action of moving the shutter slat between an up (open) position and a down (locked) position, causing the bolt to be moved between an extended position and a retracted position. When the shutter slat is in a down (locked) position the bolt engages with a bolt receiving opening adjacent to the shutter slat, and when in an up (open position) the bolt is retracted