Handheld Work Tool Housing Layout for Drop Impact Protection
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Solution Overview
Problem
Handheld battery-operated work apparatuses face challenges in achieving a compact yet robust configuration that can withstand impacts, particularly in meeting drop test requirements while ensuring the battery shaft is adequately protected.
Innovation Solution
The design incorporates an imaginary tangential plane that is tangent to the bale handle and operator-control region, allowing the work apparatus to distribute impact energy across multiple points, including the bale handle, operator-control region, and battery shaft, with the battery shaft positioned to avoid protrusion beyond this plane for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the battery shaft is configured to be very robust with pronounced ribbing to satisfy drop test requirements, then the strength and impact resistance are improved, but the housing requires more installation space and becomes less compact
Solution Approach 1:
The patent applies beforehand cushioning by positioning the battery shaft such that it can contact the ground in the event of a drop, before the impact reaches critical components. The battery shaft acts as a sacrificial element that absorbs impact energy first, protecting more vulnerable parts of the housing. This is achieved through careful spatial arrangement where the battery shaft extends to a position that allows ground contact during drops, cushioning the impact before it reaches the main housing structure.
2Volume of moving object
If the housing is made compact to reduce size, then the volume is reduced, but the ability to robustly withstand impacts is compromised
Solution Approach 1:
The patent applies another dimension by considering the third dimension of impact protection - the spatial arrangement and orientation of the battery shaft relative to the housing and ground contact points. Instead of only adding protective ribbing in the traditional sense, the solution uses the vertical and lateral positioning of the battery shaft to create a protective geometry that absorbs impacts from multiple angles, achieving robustness without increasing overall housing volume.
3Reliability
If the battery shaft is positioned to contact the ground for impact absorption, then the reliability under drop conditions is improved, but the operator-control region and hand guard design become more complex
Solution Approach 1:
The patent applies universality by designing the battery shaft to serve multiple functions simultaneously: it acts as a structural support element, a ground contact point for impact absorption, and a spatial reference for positioning the operator-control region and hand guard. The same battery shaft component that protects against drops also helps define the ergonomic layout of control elements, reducing the need for separate protective structures and simplifying the overall design.
Data Source
AI summary
A handheld apparatus includes a handle at least partially engaging around a housing. The housing extends along a longitudinal axis from the back to the front end. The apparatus possesses a longitudinal plane which in a storage position runs perpendicular to the horizontal plane and contains the longitudinal axis. An operator-control region has a handle opening penetrating fully through the housing in the direction transverse to the longitudinal plane. The handle opening has in the direction of the longitudinal axis a distance point with the largest distance to the back end. The operator-control region extends in the direction of the longitudinal axis from the back end up to the distance point. The housing possesses an imaginary tangential plane which is only tangent to the housing, runs perpendicular to the longitudinal plane and is tangent to the handle. The imaginary plane is tangent to the housing in the operator-control region.