Chainsaw Electric Starter Triggered by Brake Lever Position
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Solution Overview
Problem
Existing portable, hand-held work devices with internal combustion engines face challenges in simplifying the electric starting process, often requiring multiple steps and predetermined conditions, which can reduce the practicality of electric starting.
Innovation Solution
A control device that uses a signal transmitter on the actuating lever to detect the pivoting position and emit a start signal to the electric motor, allowing safe and efficient starting of the internal combustion engine by recognizing predetermined positions of the actuating lever, and includes features for restarting the engine based on operating conditions and user input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple predetermined starting conditions are required for electric starting, then safety is improved, but ease of operation deteriorates
Solution Approach 1:
The patent combines multiple safety functions (brake engagement detection, throttle position verification, hand presence detection) into a single integrated control unit that automatically evaluates all conditions and enables starting when safe, eliminating the need for separate manual checks and simplifying the operator's task while maintaining comprehensive safety
Solution Approach 2:
The control unit automatically monitors and evaluates all starting conditions without requiring manual intervention or user judgment, making the system self-verify safety conditions and autonomously determine when starting is safe, thereby improving both safety and ease of operation
2Ease of operation
If a signal transmitter and control device are added to detect actuating lever position, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it monitors brake engagement, detects throttle position, verifies hand presence, evaluates starting conditions, and controls the electric starter activation. By making the control device multi-functional, the patent avoids adding separate dedicated components for each function, thereby improving ease of operation while minimizing the increase in device complexity
Solution Approach 2:
The patent introduces a signal transmitter as an intermediary component that converts the physical position of the actuating lever into an electrical signal that the control unit can process. This intermediary enables automatic detection without requiring complex mechanical linkages or direct sensor integration into the lever mechanism itself
3Reliability
If the brake device must be engaged before starting, then safety is improved, but productivity deteriorates
Solution Approach 1:
The control unit automatically verifies brake engagement status as a preliminary condition before enabling starting, eliminating the need for the operator to manually check or remember to engage the brake. This preliminary automatic verification maintains safety while reducing the time and cognitive load on the operator, thereby improving productivity
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 safe and simple repeated starting of the internal combustion engine with fewer steps, incorporating user safety features and efficient restart functionality, improving operational convenience and safety.
Implementation Method 1
The starter comprises an electric motor as a starter motor
Implementation Method 2
a signal transmitter is provided on the operating lever to detect its pivot position and report it to the control device
Implementation Method 3
The temperature is recorded as information from a thermocouple in a control unit
Implementation Method 4
a brake is engaged to stop the tool, the brake being operated by an actuating lever
Data Source
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AI summary
A starting device for a motor chain saw (1) with an internal combustion engine (3) comprises an electric motor (40) with a control device (50) which activates the electric motor (40) and starts the internal combustion engine (3). The motor chain saw (1) has a braking device (10) for stopping the tool (5), the braking device (10) being operated via an actuating lever (12). To do this, the actuating lever (12) must be moved from a first position (A) into at least one further position (B). The control device (50) is connected to a signal transmitter (20) which is actuated when the actuating lever (12) moves from the first position (A) to the further position (B) and sends a signal (39) to the control device (50). emits, the signal (39) forming a start signal (51) for starting the electric motor (40) and for starting the internal combustion engine (3).