Compact Electric Ratchet Wrench Nested Motor and Battery
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Solution Overview
Problem
Conventional electric ratchet wrenches have a large overall volume due to the sequential arrangement of components, making them bulky and difficult to maneuver, especially when activating the motor.
Innovation Solution
The electric ratchet wrench features a detachable wrench body unit with a support ring, sleeve member, and connecting ring, which allows for a compact design, along with an electric unit that includes a motor and transmission subunit, and a control unit with a trigger mechanism for easy activation, reducing the overall volume and improving usability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the front cover, deceleration gear set, and support tube are sequentially sleeved on one another, then the components are assembled, but the overall volume becomes large and difficult to reduce
Solution Approach 1:
The patent applies nesting by placing the motor inside the support tube, the deceleration gear set inside the motor housing, and the battery inside the handle. This nested arrangement allows components to occupy overlapping spatial zones, dramatically reducing the overall volume of the wrench while maintaining all necessary functions.
Solution Approach 2:
The patent transitions from a linear sequential arrangement (front cover → deceleration gear set → support tube) to a three-dimensional distributed arrangement where components are positioned in different spatial zones along the handle axis. The motor is located in the middle zone, the battery in the rear zone, and the deceleration gear set in the front zone, enabling compact packaging through spatial optimization.
2Ease of operation
If the crown portion is moved in a lengthwise direction to turn on the motor, then the motor can be activated, but the operation becomes troublesome
Solution Approach 1:
The patent replaces the traditional mechanical crown portion actuation system with an electronic control system. A button switch mounted on the handle activates a controller that electronically starts the motor, eliminating the need for manual crown portion movement and simplifying the user interface.
Solution Approach 2:
The control system includes automatic functions where the controller automatically starts the motor when the trigger is pulled and automatically stops the motor when the trigger is released. This self-service control eliminates the need for manual crown portion operation and provides intuitive, automatic motor activation.
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 results in a more compact and user-friendly electric ratchet wrench with enhanced structural strength, easier motor activation, and improved illumination for working in dark environments, while maintaining efficient energy transmission.
Implementation Method 1
a battery module that is disposed in the rear space, that is electrically connected to the control module, and that is configured to provide the electrical energy
Implementation Method 2
an electric motor that is mounted in the middle space, that is connected to the rear ring section, and that converts electrical energy to kinetic energy
Implementation Method 3
a transmission subunit that is mounted in the front space, that is connected to the front ring section, and that is configured for transmitting the kinetic energy to the head driver
Data Source
AI summary
An electric ratchet wrench includes a tool head unit, a wrench body unit, an output unit, an electric unit, and a control unit. The wrench body unit defines a front space, a middle space and a rear space, and includes a support ring including front and rear ring sections that surround respectively the front and middle spaces. The electric unit includes an electric motor connected to the rear ring section and converting electrical energy to kinetic energy, and a transmission subunit connected to the front ring section, and transmitting the kinetic energy to a head driver of the output unit. The control unit includes a control module signally connected to the electric motor, and a battery module electrically connected to the control module, and providing the electrical energy.