Pulling Detection Device with Dual Switches for Staged Tension Measurement
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Solution Overview
Problem
Existing pulling detection devices for moving bodies are unable to reliably detect tension on control cables in stages, leading to potential damage and movement hindrance, and are often bulky, making them difficult to integrate into small spaces and prone to environmental noise issues.
Innovation Solution
A compact pulling detection device with a movable rod, compression spring, and dual switches that detect tension stages by restricting movement in specific directions, allowing for precise tension measurement and control through switch operation states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a displacement sensor, proximity sensor, or load cell is used to directly measure pulling amount or tension, then tension can be detected in stages, but the device size increases
Solution Approach 1:
The patent replaces complex mechanical measurement devices (displacement sensors, load cells) with a simple mechanical lever mechanism. The lever arm amplifies small displacement movements into larger movements that can actuate switches, eliminating the need for electronic sensors and signal amplification circuits. This mechanical substitution achieves staged tension detection while maintaining a compact device size.
Solution Approach 2:
The patent introduces a lever arm as an intermediary mechanical element between the tension source and the switch actuation mechanism. The lever arm converts and amplifies the small movements caused by tension in the wire or cable into sufficient movement to open or close switches at different tension thresholds, enabling staged detection without requiring direct measurement devices.
2Reliability
If a large-sized tension measurement device is provided at the connection location between moving body and external cable, then tension can be detected, but it is difficult to integrate into small spaces
Solution Approach 1:
The patent replaces bulky electronic measurement and signal processing equipment with a compact mechanical lever and switch system. The mechanical lever provides both the measurement function and the signal generation function (through switch actuation) in a single integrated mechanism, dramatically reducing the space required for reliable tension detection at the moving body connection point.
3Reliability
If environmental noise measures are added to wiring when reducing device size, then signal integrity is maintained, but device complexity increases
Solution Approach 1:
The patent eliminates electronic wiring and signal transmission issues by using a purely mechanical switch-based output system. The switches provide direct mechanical/electrical contact that generates control signals without requiring long wiring runs or signal amplification, thereby eliminating the need for complex electromagnetic shielding and noise filtering measures.
4Device complexity
If only a single wire with switch is used to detect excessive tension, then the structure is simple, but only a specific magnitude of tension can be detected and staged detection is impossible
Solution Approach 1:
The patent divides the detection function into multiple independent switches, each associated with a specific tension threshold. The lever arm system segments the detection range by using different lever arm lengths or pivot positions to activate different switches at different tension levels, enabling staged detection while keeping each individual detection element simple.
Solution Approach 2:
The patent uses a dynamic lever arm mechanism that can be adjusted or configured to provide different mechanical advantage ratios. By changing the lever arm configuration, different tension thresholds can be set for different switches, enabling flexible staged detection without requiring multiple complex fixed mechanisms.
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 device effectively detects tension on control cables in stages, preventing damage and movement hindrance while maintaining a small size and simple structure, enabling reliable operation and noise resistance.
Implementation Method 1
an elastic body provided between the second wall portion opposed surface and the second wall portion so as to press the second wall portion opposed surface, the elastic body being extendable/contractible in the longitudinal direction of the foundation portion
Data Source
AI summary
A pulling detection device includes: a base in which, on a foundation portion, a first wall portion, a projection, and a second wall portion are provided; a movable rod including a switch operation body and a pulling rod, the switch operation body having a first wall portion opposed surface, a projection opposed surface, and a second wall portion opposed surface, the pulling rod extending from the second wall portion opposed surface, while movement of the movable rod toward one side is restricted by contact between the first wall portion and the first wall portion opposed surface and movement of the movable rod toward another side is restricted by contact between the projection and the projection opposed surface; an elastic body provided between the second wall portion opposed surface and the second wall portion; a first switch which operates by contact/separation; and a second switch which operates by contact/separation.