Cylinder Lock Reinforcements for Structural Strength
Solution Overview
Problem
Cylinder locks are prone to damage from frequent rotation and external forces due to weaknesses in the outer drive spindle and retractor case, which affects their structural strength.
Innovation Solution
The cylinder lock design incorporates a retractor case with inner and outer cover plates, a middle cage, and a housing with interlocking units that engage radially extending tongues, enhancing torsional, tension, and compressive strength by preventing relative rotational movements between the shell and retractor case.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cylinder lock uses a simple structure without reinforcements, then the device complexity is low and ease of manufacture is high, but the strength and reliability are insufficient due to damage from frequent rotation and external forces
Solution Approach 1:
The retractor case is divided into multiple components: inner cover plate, outer cover plate, and middle cage. Each component has specific structural features (interlocking elements, tongues, grooves) that work together to provide strength while maintaining manufacturability through modular assembly
Solution Approach 2:
The interlocking unit combines multiple functional elements: interlocking elements on the housing, corresponding tongues on the retractor case, and engagement grooves. These elements are merged into a single integrated locking mechanism that provides torsional, tension, and compressive strength simultaneously
2Reliability
If the cylinder lock components are strengthened to resist external forces, then the reliability improves, but the ease of operation may deteriorate due to increased friction or stiffness
Solution Approach 1:
Reinforcements are applied locally only where needed: the interlocking elements and tongues are positioned specifically at critical stress points on the retractor case, while other areas maintain their original design for smooth operation. This localized strengthening prevents damage without creating unnecessary friction throughout the entire mechanism
Data Source
AI summary
A cylinder lock includes a shell that has an enlarged tubular section, and a constricted tubular section. A retractor case that contains a latch retractor for retracting a latch is disposed within the enlarged tubular section. An inner surface of the enlarged tubular section is provided with an interlocking unit that interlocks with the retractor case to prevent relative rotational movements of the retractor case and the shell. In an embodiment, the retractor case has at least one tongue extending radially between a pair of annularly spaced apart interlocking elements of the interlocking unit.