Power Tool Bit Holder Integrated with Battery Mount
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Solution Overview
Problem
Existing power tools with bit holders on the rear surface of the battery pack mount limit the length of bits that can be held, causing the bit to project beyond the tool and interfere with handling.
Innovation Solution
A bit holder integrated with the battery pack mount, featuring resilient clips on the side surface that hold the bit with its distal or basal end directed toward the front, allowing longer bits to be accommodated without projection, and includes a buffer function to prevent contact with the user or workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the bit holder is arranged on the rear surface of the battery pack mount with the bit extending in the sideward direction, then the bit holder structure is simple, but the bit projects beyond the tool when longer than the sideward width, causing handling difficulty
Solution Approach 1:
The invention changes the spatial orientation of the bit from a sideward extension to a frontward extension along the longitudinal axis of the tool. The bit holder is repositioned on the front surface of the battery pack mount, allowing the bit to extend in the front-to-rear direction rather than sideways, thereby preventing projection beyond the tool width while maintaining structural simplicity
Solution Approach 2:
The invention inverts the conventional arrangement by placing the bit holder on the front surface instead of the rear surface of the battery pack mount. This inversion allows the bit to be held with its distal end directed toward the front, fundamentally changing how the bit is positioned relative to the tool body and eliminating the projection problem
2Ease of operation
If the bit holder limits the bit length to prevent projection, then tool handling is improved, but the versatility for different bit lengths is reduced
Solution Approach 1:
The invention utilizes the longitudinal dimension of the battery pack mount (front-to-rear direction) to accommodate bits of varying lengths. By orienting the bit holder along the longitudinal axis rather than laterally, the design can accommodate longer bits without them projecting beyond the tool width, thereby maintaining both ease of operation and adaptability
Solution Approach 2:
The bit holder design on the front surface serves multiple functions: it holds bits securely, accommodates various bit lengths without projection, and maintains balanced tool handling. The frontward orientation of the bit allows the same holder structure to universally accommodate different bit lengths that would otherwise project sideways in conventional designs
Data Source
Figure 1
Figure 2~3
AI summary
A power tool (10) includes a main body (11), chuck (18a), and a bit holder (21). The main body includes a motor (17a), a transmission (17) that directly or indirectly transmits rotation generated by the motor to an output shaft (18), a grip (15), and a battery pack mount (16) located at the bottom end of the grip and elongated in a front-to-rear direction. The chuck is arranged on a distal end of the output shaft and projects toward the front from the main body. The bit holder is integrated with the battery pack mount. The bit holder is configured to hold a spare or non-used bit (19) so that a distal end or a basal end of the spare or non-used bit is directed toward the front.