Rotary Tool Wrench Assembly for Easier Bit Holder Adjustment
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Solution Overview
Problem
Existing rotary tools lack an efficient mechanism for adjusting the bit holder, which complicates the process of changing bits and maintaining the tool.
Innovation Solution
A rotary tool design that incorporates a wrench assembly movable between two positions, allowing for easy engagement and disengagement with the bit holder, and featuring a groove and protrusion mechanism to secure the wrench assembly in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a traditional fixed bit holder design is used, then the tool structure is simple, but the process of changing bits and maintaining the tool becomes complicated and time-consuming
Solution Approach 1:
The wrench assembly is designed to be movable between a first position (disengaged from the bit holder) and a second position (engaged with the bit holder), allowing dynamic adjustment of the bit holder. This dynamic mechanism enables easy bit changes while maintaining a relatively simple overall tool structure.
Solution Approach 2:
The wrench assembly acts as an intermediary component between the user's manual input and the bit holder adjustment mechanism. By engaging with the bit holder through this intermediary wrench assembly, the system simplifies the operation of changing bits while maintaining structural efficiency.
2Reliability
If the wrench assembly is permanently engaged with the bit holder, then the bit holder is securely retained, but the wrench assembly cannot be moved to adjust the bit holder
Solution Approach 1:
The engagement mechanism between the wrench assembly and bit holder is designed to be dynamic rather than fixed. The wrench assembly can transition between engaged and disengaged states, providing both secure retention when needed and flexibility for adjustment when required.
Solution Approach 2:
The retention mechanism is segmented into discrete engagement positions (first position for disengagement, second position for engagement). This segmentation allows the wrench assembly to be reliably retained in specific positions while maintaining the ability to move between positions for adjustment purposes.
3Reliability
If the protrusion is positioned close to the groove, then the wrench assembly is securely retained, but the wrench assembly cannot be moved between positions
Solution Approach 1:
The spatial relationship between the protrusion and groove is designed to enable dynamic positioning. The protrusion can engage with the groove in the second position to provide secure retention, while the mechanism allows the wrench assembly to move to the first position where disengagement occurs, balancing retention and movability.
Solution Approach 2:
The engagement mechanism utilizes axial spacing as an additional dimension to control the interaction between the protrusion and groove. By positioning the protrusion axially spaced apart from the groove in the first position and engaged in the second position, the system achieves both secure retention and ease of movement between defined positions.
Data Source
AI summary
A rotary tool includes a housing, a drive shaft positioned within the housing, and a bit holder. The bit holder is positioned adjacent a distal end of the housing and is driven by rotation of the drive shaft. The rotary tool also includes a wrench assembly coaxially movable along the longitudinal axis and selectively engageable with the bit holder, a groove positioned on one of the housing and the wrench assembly, and a protrusion positioned on the other of the housing and the wrench assembly. The protrusion engages the groove and retaining the wrench assembly against axial movement while the wrench assembly is in a first position, and the protrusion is axially spaced apart from the groove while the wrench assembly is in a second position.