Portable Pulling Tool One-Piece Gear Case and Load Control
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Solution Overview
Problem
Conventional winches and hoists are often misused by overloading, leading to motor stall and potential breakdown due to their cumbersome and heavy design, which limits their portability and reliability in applications requiring easy handling and precise load management.
Innovation Solution
A portable pulling tool with a durable, lightweight construction featuring a one-piece casting for precise gear alignment, a differential planetary gear system for compact size and self-braking, and an electronic load limiter that monitors motor current and indicates overload conditions through an LED system to prevent motor stall.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional winches and hoists are designed with heavy and cumbersome construction, then their strength and durability are improved, but their portability and ease of carrying deteriorate
Solution Approach 1:
The patent employs composite materials in the construction of the winch housing and structural components. The housing is made from a composite material that provides high strength-to-weight ratio, allowing the winch to maintain structural integrity while reducing overall weight for improved portability.
Solution Approach 2:
The winch is divided into modular segments that can be easily assembled and disassembled. The housing, motor assembly, drum, and control components are separate modules that can be carried independently, improving portability while maintaining the strength of the complete system when assembled.
2Productivity
If the motor operates at high speed, then productivity is improved, but the risk of motor breakdown under overload conditions increases
Solution Approach 1:
The patent incorporates a feedback control system with an overload sensor that continuously monitors motor current and provides feedback to the control circuit. When overload conditions are detected, the system automatically adjusts motor operation or shuts down to prevent breakdown, allowing high-speed operation under normal conditions while protecting against overload.
Solution Approach 2:
The control circuit includes a pre-programmed overload protection mechanism that anticipates potential motor breakdown conditions. The system is designed with protective features that activate before actual damage occurs, cushioning against the harmful effects of overload during high-speed operation.
3Productivity
If a complex gear train is used to achieve high-speed motor operation, then productivity is improved, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates unnecessary intermediate gear components from traditional complex gear trains. By using a simplified gear reduction mechanism with fewer teeth and components, the design achieves the required speed reduction while minimizing complexity and improving reliability.
Solution Approach 2:
Instead of using a multi-stage gear train to reduce speed, the patent inverts the approach by using a high-speed motor directly coupled with a simplified reduction mechanism. The gear train is designed to provide only the necessary reduction ratio, eliminating excessive complexity while maintaining productivity.
4Manufacturing precision
If precise gear alignment is required, then manufacturing precision is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges the gear alignment features directly into the housing structure itself. The housing includes integrated alignment features such as precision-machined mounting surfaces and positioned gear seats that ensure accurate gear alignment without requiring separate alignment procedures or complex adjustment mechanisms.
Solution Approach 2:
The housing is pre-machined with precision alignment features during manufacturing, establishing the correct gear positions and alignments before assembly. This preliminary action ensures that when components are assembled, precise alignment is achieved automatically without requiring complex post-assembly adjustment procedures.
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 portable pulling tool ensures reliable operation by preventing motor overload through precise load monitoring and indication, maintaining portability and reliability while accommodating high-speed motor operations and providing a compact, self-braking mechanism.
Implementation Method 1
an electronic load limiter that monitors motor current
Implementation Method 2
drives a multi segment LED that indicates approximately how much load is being pulled
Implementation Method 3
a differential planetary gear system which has a compact size and self-braking capability
Implementation Method 4
The system gear train utilizes a combination of helical gearing to accommodate the motor high speed
Data Source
AI summary
A portable pulling tool is provided including an integrally formed one-piece gear case for positioning all of the gear train components. The gear train includes a combination of helical gears and a differential planetary gear unit in a unique configuration. A motor control system is provided to automatically shut off the motor when a predetermined current load is detected. A multi-segment LED is provided to indicate to the user the amount of load that is being applied.