Work Apparatus Handle Actuation Member Boost Position
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Solution Overview
Problem
Work apparatuses with drive motors, such as motorized chainsaws and blowers, face challenges in managing increased loads and requiring temporary power boosts for tasks like detaching damp leaves, where existing controls lack simplicity and effectiveness in switching between continuous operation and increased power modes.
Innovation Solution
A handle design with an actuation member that can be easily switched between a maximum operating position for continuous use and a boost position for increased power, featuring a recess in the grip surface allowing users to pivot the actuation member into the handle for enhanced performance, coupled with a spring mechanism to prevent accidental activation and a potentiometer for controlled power metering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the actuation member is designed with only a maximum operating position for continuous operation, then the control system is simple, but the device cannot provide temporary power boosts for increased load requirements
Solution Approach 1:
The actuation member is segmented into two distinct functional positions: a maximum operating position for continuous operation and a boost position for temporary increased power. The recess in the grip surface is segmented to provide separate access paths - the main grip area for normal operation and the recess cavity for boost activation. This segmentation allows the single actuation member to control multiple operating modes without requiring separate control mechanisms.
2Ease of operation
If the actuation member can be easily actuated into the handle body, then the boost position is easily accessible, but accidental activation may occur
Solution Approach 1:
The recess in the grip surface has specific local geometric characteristics - it is smaller than the pressure surface of the actuation member and positioned at a specific location. This local quality design means that only when the user deliberately places a finger into the recess can the actuation member be pushed into the boost position. The surrounding grip surface does not provide access to the boost position, creating a localized activation zone that reduces accidental activation while maintaining ease of intentional actuation.
3Loss of information
If the pressure surface remains accessible in all positions, then continuous control is possible, but the boost position cannot be distinguished from normal operation
Solution Approach 1:
The design uses the third dimension (depth) to provide positional feedback. When the actuation member is in the boost position, it is displaced deeper into the handle body, causing the pressure surface to move from the outer grip surface into the interior of the handle. This dimensional change creates a tactile distinction - the user can feel the difference in depth and position, providing clear feedback that the boost mode is active while maintaining the ability to control the actuation member continuously.
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 users to select and maintain continuous operation while achieving a 10-30% performance increase in the boost position, ensuring efficient power management and preventing unintentional activation through haptic feedback.
Implementation Method 1
a spring mechanism to prevent accidental activation and provide haptic feedback
Data Source
AI summary
A handle for a work apparatus has an actuation member for controlling the rpm of a drive motor of the work apparatus. The actuation member is mounted in the handle and has a pressure surface for the fingers of a user hand. In an initial position, the actuation member protrudes with its pressure surface beyond the grip surface of the handle and, in a position for continuous operation of the motor, has dipped into the grip surface so that the pressure surface of the actuation member lies at the level of the grip surface. A recess extends in the longitudinal direction of the handle and is formed in the grip surface. The recess overlaps the pressure surface of the actuation member so that the actuation member is displaced into the handle via the recess to a boost position whereat the pressure surface lies within the grip surface.