Cord Lock Pressing Portion Spring Orientation
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Solution Overview
Problem
Conventional string fasteners face issues with holding force due to the arrangement of the hollow portion and coil spring axis, leading to increased operation load for releasing strings and potential operability deterioration.
Innovation Solution
A cord lock design featuring a main member portion with an opening, a movable pressing portion, and a coil spring positioned to wrap a virtual three-dimensional shape formed by imaginary faces, enhancing the holding force through a bend insertion portion that allows the string to pass by bending, thereby improving the transmission of urging force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the coil spring axis is arranged side by side with the hollow portion for passing strings, then the structure is simplified, but the holding force of the strings deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional side-by-side arrangement to a three-dimensional wrapping arrangement. The coil spring axis is positioned to wrap around the hollow portion in a substantially circular manner, creating a spatial configuration where the spring's urging force acts radially inward on the string member, significantly improving holding force while maintaining structural simplicity.
2Force
If the spring load is increased to enhance holding force, then the holding force improves, but the operation load for releasing strings increases
Solution Approach 1:
The patent introduces a pressing portion with a pressing face that locally concentrates the spring's urging force onto the string member at a specific location. This localized pressure application enhances holding force without requiring a proportional increase in overall spring load, as the force is efficiently transmitted at the critical contact point between the pressing portion and the string member.
3Force
If the pressing portion tilts to generate holding load, then holding force is generated, but the pressing portion is caught on the female member increasing release load
Solution Approach 1:
The pressing portion is designed to dynamically adjust its position and orientation based on the string member's location. The pressing portion can tilt or rotate to apply force effectively, then return to a neutral position that prevents catching on the female member during release operations, enabling smooth operation throughout the device's cycle.
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 ensures a robust holding force for the string member by effectively transmitting the urging force from the coil spring, reducing the operation load for releasing and enhancing the overall holding capability.
Implementation Method 1
there is provided an urging device (for example, a coil spring) for urging the pressing portion to a front of the main member portion
Data Source
AI summary
A pressing portion is housed movably in a front-and-back direction inside a main member portion. In the main member portion, two main-member-portion holes through which a string member passes are formed on a side wall forming an opening portion. The pressing portion includes a pressing face on a front face, and internally provides a pressing-portion string insertion portion which can communicate with the two main-member-portion holes and through which the string member passes. A bend insertion portion for inserting the string member to pass through by bending the string member inside the pressing portion is provided. An urging device for urging the pressing portion is provided at a position wrapping a virtual three-dimensional shape obtained by connecting, with straight lines, two imaginary faces on which an inner face of the side wall and an outer shape of the string member passing through the two main-member-portion holes intersect.