Espagnolette Connecting Rod Gear Anti-Burglary Locking
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing connecting rod gears for espagnolette fittings lack a means to secure the position of the connecting rod, making them vulnerable to burglary attempts, and previous solutions are overly complex in design and manufacturing.
Innovation Solution
The connecting rod gear design features a gear wheel with teeth spaced farther apart than the corresponding recesses in the connecting rod, allowing the gear wheel to pivot and engage the drive rod only when displaced, effectively locking the rod in place by preventing further movement due to the mismatched spacing, and includes a limited swivel angle and acute-angle tooth configuration for enhanced locking force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the gear wheel teeth are spaced farther apart than the connecting rod recesses, then the connecting rod is locked in position and burglary prevention is improved, but an idle path must be overcome during operation
Solution Approach 1:
The gear wheel is designed with a limited swivel angle that allows dynamic movement during normal operation to overcome the idle path, while the tooth spacing configuration ensures static locking when the connecting rod is in the locked position. This dynamic design enables the system to adapt between operational and security states.
2Reliability
If a locking mechanism is added to secure the connecting rod position, then security against burglary is improved, but the complexity of the connecting rod mechanism increases
Solution Approach 1:
The locking function is merged into the existing gear wheel and connecting rod mechanism by utilizing the tooth spacing relationship between these components. No separate locking mechanism is added; instead, the existing components are configured to provide both gear engagement and security locking functions simultaneously.
Solution Approach 2:
The gear wheel and connecting rod automatically provide locking functionality through their inherent tooth spacing relationship. The system self-locks when the connecting rod is displaced, using its own structural features rather than requiring external locking components.
3Force
If the gear wheel has a limited swivel angle with acute-angle tooth configuration, then locking force is enhanced, but the range of motion is restricted
Solution Approach 1:
The tooth configuration is designed with acute angles specifically at the locking positions to maximize locking force where needed, while the overall gear wheel maintains sufficient swivel angle for operational movement. Different parts of the gear engagement cycle have different functional requirements that are addressed by the localized tooth geometry.
Data Source
Figure 1
Figure 2
AI summary
The mechanism (1) has a gear wheel (5) with teeth (6) that engage driving bar teeth (7) of a driving rod (3). The driving bar teeth are formed by sequential recesses or openings (22). Teeth (9, 11) in the teeth (6) engage the recesses or openings for formation of mating. Distance between the teeth (9, 11) and two adjacent teeth of the gear wheel is measured greater than the assigned recess or opening of the driving rod by a changed tooth pitch. The driving rod is guided into a housing (4), and the gear wheel faces a housing wall (21) that supports the driving rod.