Cylindrical Lock Retractor Roller Mechanism
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Solution Overview
Problem
Cylindrical locks face challenges in producing retractors with high yield due to difficulties in drilling holes and inconsistent hole positions, leading to a high product defect ratio.
Innovation Solution
A cylindrical lock design featuring an inner and outer chassis with pivotable spindles, locking rings, and a retractor mechanism with rollers and pivots that allows smooth sliding movement between handles, reducing the need for precise hole drilling and enhancing assembly efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If drilling holes in the retractor is performed using conventional methods, then the retractor can be assembled with handles, but the manufacturing precision and productivity are reduced due to difficulty in drilling and inconsistent hole positions
Solution Approach 1:
The retractor body is designed with pre-formed through holes during the injection molding process, before the actual assembly takes place. This preliminary formation of holes eliminates the need for subsequent drilling operations, ensuring consistent hole positions and reducing manufacturing defects while improving production efficiency
2Ease of manufacture
If the retractor structure is simplified to improve manufacturing, then the assembly efficiency increases, but the reliability of smooth sliding movement between handles may be compromised
Solution Approach 1:
Rollers are introduced as intermediary components between the retractor body and the handles. These rollers facilitate smooth sliding movement and reduce friction, maintaining reliable operation while allowing for a simpler overall structure that is easier to manufacture and assemble
Solution Approach 2:
The retractor body is designed with specific geometric parameters including upper and lower recesses with predetermined dimensions and positions. These parameter optimizations ensure proper fit and smooth movement while maintaining manufacturing simplicity through injection molding processes
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 design improves the yield of retractor production by simplifying assembly, reducing wear on components, and minimizing product defects through precise compartmentalization and the use of torsion springs for returning forces, ensuring reliable operation and reduced wear.
Implementation Method 1
the use of torsion springs for returning forces
Data Source
AI summary
A cylindrical lock includes a retractor mounted between inner and outer operational devices and operably connected to a latch. The retractor includes an upper surface having an upper recess. The retractor further includes a lower surface having a lower recess. Two upper compartments are defined in two sidewalls of the upper recess and extend to two lateral surfaces of the retractor, forming two upper tongues. Two lower compartments are defined in two sidewalls of the lower recess and extend to the lateral surfaces of the retractor, forming two lower tongues. First and second rollers are rotatably received in the upper and lower recesses, respectively. A size of an opening of each of the upper and lower compartments is reduced by pressing a distal end of each upper tongue downward and by pressing a distal end of each lower tongue upward, retaining the first and second rollers in place.