Cylindrical Lock Lining and Torsion Spring Assembly
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Solution Overview
Problem
Cylindrical locks face issues with wear on the inner and outer chassis due to pivotal movement of spindles and difficulties in assembling torsion springs, leading to potential deformation and assembly challenges.
Innovation Solution
The design incorporates an inner and outer chassis with ribs and linings of varying hardness to reduce wear and facilitate easy assembly, featuring a ribbed structure and torsion springs with tangs that twist easily into place, ensuring smooth pivotal movement and reduced wear on the linings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inner and outer chassis are made of the same material as the spindles, then the material compatibility is improved, but the wear resistance of the chassis is worsened
Solution Approach 1:
The patent applies different materials to different parts of the chassis based on their functional requirements. The inner periphery of the space and axial hole are made of a wear-resistant material (different from the spindle material) to resist wear from pivotal movement, while other parts of the chassis maintain their original material composition. This local differentiation resolves the contradiction between material compatibility and wear resistance.
2Ease of manufacture
If the torsion spring tangs are twisted for mounting, then the spring can be installed in the chassis, but the assembly process becomes difficult
Solution Approach 1:
The torsion spring is pre-assembled with the push ring before installation into the chassis. The tangs are positioned and secured in advance, so that when the complete assembly is installed in the chassis, no additional twisting or complex manipulation is required. This preliminary preparation eliminates the difficult twisting operation during final assembly, resolving the contradiction between assembly feasibility and assembly time.
3Stability of the object's composition
If the space includes an arcuate movement groove with stepped portions, then the pivotal movement is restrained, but the risk of lug deformation is reduced only partially
Solution Approach 1:
The patent introduces an intermediary component (the reinforced inner periphery structure) between the spindle lug and the movement groove to provide additional support and distribution of stresses. This intermediary reinforcement prevents direct concentration of forces on the lug, thereby preventing deformation while maintaining the movement restraint function of the groove.
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 effectively minimizes wear on the linings and simplifies assembly, enhancing the durability and ease of assembly of cylindrical locks while preventing deformation and ensuring reliable operation.
Implementation Method 1
a first torsion spring mounted around the sleeve portion of the first push ring. The first torsion spring includes first and second tangs abutting two sides of the first push leg of the first push ring
Data Source
AI summary
A cylindrical lock includes a retractor (131) mounted between inner and outer operational devices (10, 12) and operably connected to a latch (779). The inner operational device (10) includes an inner chassis (20), an inner spindle (76), and an inner lining (60) made of a material harder than the inner spindle (76). The outer operational device (12) includes an outer chassis (305), an outer spindle (379), and an outer lining (353) made of a material harder than the outer spindle (379). Inner and outer returning devices (38A, 38B) are provided for returning the inner and outer spindles (76, 379). A torsion spring (50A, 50B) of each of the inner and outer returning devices (38A, 38B) is mounted to a push ring (40A, 40B) before assembly with the inner and outer chassis (20, 305), allowing easy assembly of the torsion springs (50A, 50B).