Link Mechanism Absorbs Overstroke in Switch Detection
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Solution Overview
Problem
Conventional opening-closing member detecting devices face issues such as contaminant accumulation and rust, vulnerability to impact, incomplete overstroke absorption, and strict part size management due to exposed switch contacts, loose attachment substrates, and directional load on switches, which affect reliability and manufacturing costs.
Innovation Solution
An opening-closing member detecting device with a frame, link, and urging member, where the link has a first and second fulcrum forming portion and a switch operation portion, allowing the link to move around fulcra to absorb overstroke without altering the switch operation position, ensuring consistent contact and improved design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch contact portion is exposed to detect the opening-closing member, then the detection function is achieved, but contaminant accumulation and rust occur leading to unreliable conduction
Solution Approach 1:
The patent introduces a link mechanism as an intermediary between the opening-closing member and the switch. The link transmits the mechanical motion of the opening-closing member to operate the switch indirectly, while the switch itself remains in a protected position. This mediator allows the detection function to be achieved without exposing the switch contact portion to contaminants.
2Reliability
If the attachment substrate is swingably supported to absorb overstroke, then overstroke absorption is achieved, but the configuration becomes vulnerable to impact during transport
Solution Approach 1:
The patent extracts the overstroke absorption function from the attachment substrate and places it in the link mechanism. The link is designed with specific geometric constraints that allow it to absorb overstroke through controlled movement, while the attachment substrate remains fixed and robust, resistant to impact during transport.
3Reliability
If the guide groove changes the pressing direction to absorb overstroke, then overstroke absorption is partially achieved, but the load on the switch contact increases causing potential damage
Solution Approach 1:
The link acts as an intermediary that transforms the force direction before it reaches the switch. Through its mechanical geometry, the link converts the opening-closing motion into switch operation while absorbing overstroke, ensuring that the force applied to the switch contact remains within safe limits regardless of the opening-closing member's movement extremes.
4Measurement precision
If a narrow on/off operation range switch is used for precise detection, then detection precision is improved, but strict part size management is required affecting yield and cost
Solution Approach 1:
The patent segments the detection function into two parts: the link handles the mechanical motion transmission and geometric constraints, while the switch handles the electrical detection. This segmentation allows the switch to operate with a wider, more tolerant range, reducing manufacturing precision requirements while maintaining detection precision through the link's mechanical design.
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 absorbs overstroke, enhances reliability by maintaining consistent switch operation, and reduces manufacturing costs through improved design freedom and reduced risk of switch damage.
Implementation Method 1
urging member for urging the link
Data Source
AI summary
The device of the present invention includes a frame that supports a switch and a link provided between an opening-closing member and the switch. The link has a first fulcrum forming portion supported at a first support portion of the frame to form a first fulcrum, a power-point portion pushed by the opening-closing member, a second fulcrum forming portion supported at a second support portion of the frame to form a second fulcrum, and a switch operation portion that presses the switch. The first fulcrum forming portion is separable with respect to the first support member. An urging member for urging the link is provided, with the urging member urging the first fulcrum forming portion toward the first support portion.