Lock Protective Cap Reinforcing Rib Design
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Solution Overview
Problem
Existing protective caps for locks are complex and costly to produce, and they do not offer sufficient protection against manipulation, especially at critical points like the gear between the lock cylinder and bolt.
Innovation Solution
A protective cap design where the reinforcing web extends over the entire height of the side walls with a single recess for the locking cylinder screw, allowing for thin-walled side walls and cost-effective production, while providing enhanced protection by covering a mostly open narrow side of the lock case, and incorporating features like semicircular recesses and tapered side walls for secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protective cap completely covers the lock housing, then protection against manipulation is improved, but device complexity and production cost increase
Solution Approach 1:
The protective cap applies reinforcement locally only where manipulation attacks are most likely to occur - specifically at the corner area covering the gear mechanism between lock cylinder and bolt. The web extends over the entire height of side walls but with strategic recesses, concentrating material where needed while leaving other areas open, thus achieving high protection at critical points without complete enclosure
Solution Approach 2:
The protective cap is segmented into two functional parts: thin-walled side walls for coverage and a reinforcing web for structural strength. This segmentation allows the cap to provide protection where needed while maintaining ease of manufacture and low cost through simple sheet metal bending processes
2Ease of manufacture
If thin-walled material is used for side walls, then production cost is reduced, but strength and stability decrease
Solution Approach 1:
The protective cap combines thin-walled side walls with a reinforcing web to create a composite structure. The thin walls provide coverage and basic protection at low cost, while the reinforcing web made from the same sheet metal provides the necessary strength and stability through its geometric design and strategic positioning at critical areas
Solution Approach 2:
The reinforcing web adds a dimensional element to the otherwise thin-walled structure. By extending the web over the entire height of the side walls and positioning it to cover the narrow side of the lock case, the design transforms a two-dimensional thin wall into a three-dimensional reinforced structure that resists manipulation forces
3Ease of manufacture
If the web extends over the entire height of side walls with single recess, then manufacturing cost is reduced, but protection coverage is limited
Solution Approach 1:
The design accepts limited protection coverage in exchange for manufacturing simplicity. The web with single recess configuration protects the critical corner area and gear mechanism, which are the most vulnerable points. Other areas of the lock case remain uncovered, but this is sufficient because manipulation attacks typically target the gear area rather than the entire lock housing
Data Source
Figure 1
Figure 2~3
AI summary
A protective cap (7) for a lock (1) of a door, which has a lock case (2), has a reinforcing rib (11) to protect the lock (1) from tampering. The reinforcing rib (11) covers one narrow side of the lock (1) and prevents a tool from being used to engage the mechanism between a locking cylinder (5) and a bolt (3). The remaining areas of the protective cap (7), which laterally cover the lock case (2), have a fixing device (15) for holding the protective cap (7) on the lock case (2).