Rotary Hand Tool Anti-Rotation Braking Module
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Solution Overview
Problem
Existing hand tools with electric motors for rotary applications, such as drills and hammers, face a short lifespan due to sudden jamming issues, which can lead to operator injury when the rotating member encounters an obstacle, and existing safety clutch systems are not effective in preventing such incidents.
Innovation Solution
A hand tool with a braking module that uses a gyroscopic detector to detect rotation and activate a fast-acting electromechanical contactor to isolate the motor, causing it to generate current in reverse polarity for rapid braking, thereby preventing excessive rotation and extending tool lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a safety clutch with active torque control is used to cut off motor drive when the driven part stops moving, then operator safety is improved, but the tool lifespan is reduced
Solution Approach 1:
The patent replaces the mechanical safety clutch system with an electronic control system using a gyroscopic detector and electronic braking control. This substitution eliminates the mechanical wear and failure issues of the clutch while maintaining safety functionality through electronic detection and motor braking, thereby extending tool lifespan while preserving operator protection.
Solution Approach 2:
The patent introduces a gyroscopic detector as an intermediary device between the motor and the driven part. This detector monitors tool rotation and triggers electronic braking when abnormal rotation is detected, providing safety control without the mechanical contact and wear associated with traditional safety clutches, thus extending tool life while maintaining safety.
2Speed
If the motor is braked by converting it to a current generator with reverse polarity feedback, then braking speed is improved, but device complexity increases
Solution Approach 1:
The patent implements self-service braking by converting the motor into a current generator that automatically produces braking torque when abnormal rotation is detected. The motor's own electromagnetic properties are utilized to create the braking force, eliminating the need for separate mechanical brake systems and reducing overall device complexity while achieving rapid braking.
Solution Approach 2:
The patent makes the motor multi-functional by enabling it to operate both as a drive motor during normal operation and as a braking generator when safety intervention is required. This dual functionality eliminates the need for dedicated braking components, reducing device complexity while providing effective rapid braking capability.
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 limits the risk of injury and extends tool lifespan by ensuring the tool stops rotating quickly and efficiently when encountering an obstacle, reducing the risk of accidents and prolonging the tool's operational life.
Implementation Method 1
The detection means include a gyroscopic sensor 6 installed substantially along the axis of rotation 7 of the tool
Implementation Method 2
Activating contactor 14 isolates the motor from its power supply. The motor then becomes a current generator. The generated current is fed back into the motor in reverse polarity, causing rapid, even abrupt, braking of the tool.
Data Source
Figure 1
AI summary
The tool (1) has an electric motor (3) for rotational driving of a to-be-driven element i.e. drill bit (2). A braking block (5) is used for braking the motor, and a detection unit i.e. gyroscopic sensor (6), detects rotational driving of the tool for controlling the braking block of the motor. The motor includes a contactor (14) i.e. electromechanical contactor, arranged to isolate the motor from electrical supply and to transform the motor into current generator whose current is re-injected into reversed polarity of the motor.