Angle Drill Extension Portion for Battery Protection and Torque Management
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Solution Overview
Problem
Angle drills with high output torque face challenges in protecting batteries from impact damage, as conventional protection methods increase the size and weight of the device, compromising usability and increasing the risk of battery deformation or damage.
Innovation Solution
An extension portion is integrally formed with the main housing of the angle drill, extending in a direction intersecting the battery attachment surface, providing protection to the batteries while maintaining a lightweight and compact design, and specifically covering the fragile negative electrode side end faces to prevent deformation and damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the main housing extends further rearward to reduce counter torque, then output torque is improved, but weight increases and battery protection is worsened
Solution Approach 1:
The housing is segmented into a main housing and a separate extension portion that can be attached only when high torque is needed. This allows the base apparatus to remain lightweight while providing the option to add torque-reducing extension when required for heavy-duty drilling applications.
Solution Approach 2:
The extension portion is designed to be detachably attached rather than permanently fixed, allowing the user to dynamically configure the apparatus based on task requirements. For light-duty work, the extension is removed to minimize weight; for heavy-duty work requiring higher counter torque management, the extension is attached.
2Reliability
If protection members are mounted to protect batteries, then battery protection is improved, but device size and weight increase
Solution Approach 1:
The extension portion serves dual functions: it extends the housing to reduce counter torque and simultaneously acts as a protection member for the batteries. By merging these two functions into a single component, no additional protection elements are needed, avoiding increases in size and weight.
Solution Approach 2:
The extension portion is designed as a multi-functional component that provides both mechanical advantage (torque reduction through housing extension) and protective function (shielding batteries from impact). This universal design eliminates the need for separate dedicated protection members.
3Reliability
If protection members are mounted to protect batteries, then battery protection is improved, but usability is impaired
Solution Approach 1:
The extension portion integrates protection function into the existing housing structure, maintaining the familiar form factor and grip areas of the apparatus. Users can grasp and operate the drill without encountering protruding protection members that would interfere with hand placement or tool handling.
Data Source
AI summary
An electrical apparatus comprises an extension portion extending in a direction that intersects the direction in which a battery attachment surface of a battery base extends. A battery includes a plurality of battery cells with negative electrode side end faces. The battery has negative electrode side holding portions adjacent to the exterior of each of the negative electrode side end faces. The negative electrode side holding portions are located closer to the inner region of the center of gravity of the apparatus than a virtual plane to which a lateral rear side of the extension portion and a lateral rear side of the battery are tangent.