Portable Tool Housing Structure for Controlled Impact Absorption
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Solution Overview
Problem
Portable tools face a challenge in balancing low weight for ease of handling with sufficient stiffness to protect internal units from mechanical loads during impacts or collisions, particularly in tools like chainsaws and cut-off grinders.
Innovation Solution
A housing part with a functional structure that includes a contact section for immediate impact absorption, a deformation zone for controlled deformation, and a stop section to limit deformation and distribute energy, enhancing energy absorption properties during collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the housing is made with higher stiffness to protect internal units from impact, then protection capability is improved, but weight increases
Solution Approach 1:
The housing is divided into different sections with distinct functions: a contact section made of lighter material for impact absorption, and an inner housing made of stiffer material for protecting internal units. This segmentation allows each part to be optimized for its specific function, achieving protection without excessive weight.
Solution Approach 2:
The housing employs composite construction with the contact section and inner housing made from different materials. The contact section uses materials optimized for energy absorption, while the inner housing uses materials with high stiffness and strength, creating a composite structure that balances weight and protection.
2Ease of operation
If the housing is made lighter for easier handling, then ease of operation is improved, but protection capability deteriorates
Solution Approach 1:
The housing is segmented into a contact section and an inner housing, each with optimized weight and strength characteristics. The contact section can be made lighter for ease of handling, while the inner housing provides the necessary protection, achieving a balance between ease of operation and protection capability.
Solution Approach 2:
Different parts of the housing have different material properties tailored to their specific functions. The contact section has local quality optimized for impact absorption with lighter materials, while the inner housing has local quality optimized for protection with stiffer materials, achieving ease of handling without compromising protection.
3Strength
If external protective bars are added to protect internal units, then protection capability is improved, but device complexity increases
Solution Approach 1:
The protective function is merged into the housing structure itself through the inner housing and contact section design. Instead of adding separate external protective bars, the protection is integrated into the housing, reducing device complexity while maintaining protection capability.
Solution Approach 2:
The housing structure serves multiple functions: it provides the basic housing function, acts as the protective element through the inner housing, and serves as the impact absorption element through the contact section. This multi-functionality eliminates the need for separate protective bars, reducing complexity.
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 housing part effectively reduces impact energy through controlled deformation, protecting internal tool units and ensuring functionality by absorbing and distributing collision forces, while maintaining structural integrity.
Implementation Method 1
the functional structure comprises a contact section which is arranged and configured to directly (immediately) absorbing the impact energy and to carry out a deformation
Data Source
AI summary
A housing part for a portable tool, in particular for a portable motor-driven electric tool, and/or for a power supply device of a portable electric tool, has a functional structure for absorbing an impact energy during a collision process. The functional structure has a contact section that is arranged and configured to directly absorb the impact energy and to carry out a deformation. The functional structure has a deformation zone that is arranged at the contact section and configured to receive a deformation of the contact section. The functional structure has a stop section that is arranged and configured to limit the deformation of the contact section and to transfer at least a part of the impact energy. A portable motor-driven electric tool can include at least one such housing part.