Cart Handle Assembly with Hall Sensor Force Direction Sensing
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Solution Overview
Problem
Conventional carts require significant user force to move when loaded, and existing force-sensing technologies are complex and prone to vertical vibrations, complicating accurate force direction sensing.
Innovation Solution
A handle assembly with a force sensing module that includes a permanent magnet and Hall sensor, allowing the cart to detect the direction of force applied by the user and provide power assistance through a drive unit, simplifying the structure and improving control efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a cart is loaded with increased number of objects or heavy object, then the cart can carry more load, but user is required to apply large force to move the cart
Solution Approach 1:
The patent replaces the purely mechanical pushing/pulling system with an electromechanical system. A drive unit with motor provides automated propulsion force to assist the user, converting electrical energy to mechanical motion. The force sensing module detects user intent and triggers the drive unit to provide supplemental force, effectively substituting manual mechanical effort with an automated electromechanical assistance system.
2Measurement precision
If a sensor is provided to sense the direction of force applied for movement of the cart, then force direction can be detected, but vibration occurs not only in horizontal direction but also in vertical direction due to cart movement on ground
Solution Approach 1:
The patent extracts and isolates the force sensing function from the general vibration environment. The force sensing module is specifically designed to detect only horizontal force components applied to the handle bar, filtering out vertical vibrations caused by cart movement on ground. This selective sensing approach extracts the useful signal (horizontal push/pull force) while rejecting unwanted interference (vertical vibrations).
Solution Approach 2:
The force sensing module acts as an intermediary between the user's manual force input and the automated drive unit. It detects the direction and magnitude of horizontal forces applied to the handle bar and converts this mechanical input into control signals that activate the drive unit, providing a smooth transition from manual sensing to automated response without requiring complex control algorithms.
3Measurement precision
If a force sensing module is provided to accurately sense force direction, then power assist can be provided in the correct direction, but the structure and control become complex
Solution Approach 1:
The patent replaces complex mechanical force sensing mechanisms with a simpler electromechanical sensing system. The force sensing module uses electrical sensors to detect force direction, eliminating the need for complex mechanical linkages, gears, or linkages that would be required for equivalent precision. This substitution reduces structural complexity while maintaining or improving measurement accuracy.
Solution Approach 2:
The patent changes the sensing parameter from mechanical displacement or pressure to electrical signal detection. By using electrical sensors that directly measure force components and convert them to electrical signals, the system achieves accurate force direction detection with simpler structure. The control system processes these electrical parameters to determine force direction and activate the drive unit accordingly, avoiding complex mechanical control 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
Enables convenient and accurate movement of carts by providing power assistance in the direction of force applied, reducing user effort and eliminating complex control algorithms, while maintaining cost-effectiveness.
Implementation Method 1
a force sensor unit disposed adjacent to the frame supporter and sensing a movement direction of the frame supporter... a Hall sensor disposed adjacent to the magnet and sensing a location of the magnet
Data Source
AI summary
A handle assembly for a cart with a power assist function can sense the direction that a user's force is applied, and provide assist power in the corresponding direction, such that the user can easily move the cart. A cart including the handle assembly allows the user to conveniently move the cart.