Driving Tool Rotatable Coupling Mechanism
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Solution Overview
Problem
Conventional driving tools require additional levers to disengage tool bits from the mandrel, making them difficult to operate, and earth augers are not solidly coupled to drive members, preventing effective rotation.
Innovation Solution
A driving tool with a tool stem featuring a non-circular spatial engaging member, a spring-biased projection device, and magnetic members that allow the tool shank to be selectively tilted and rotated relative to the tool stem, with a retaining mechanism to prevent disengagement, enabling operation in tight spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If additional lever tools are used to disengage tool bits from the mandrel, then the tool bit can be selectively disengaged, but the operation becomes difficult and complex
Solution Approach 1:
The tool bit features a T-shaped end with a protrusion that automatically engages with a corresponding recess in the mandrel when inserted. The spring-biased retention mechanism automatically secures the tool bit without requiring additional lever tools for disengagement, making the system self-servicing and eliminating the need for separate disengagement tools.
Solution Approach 2:
The invention extracts the disengagement function from a separate lever tool and integrates it into the mandrel-tool bit interface itself. The T-shaped interface and spring mechanism are built directly into the assembly, removing the need for external lever tools and simplifying the overall system.
2Device complexity
If earth augers are coupled to drive members with balls, then the coupling is simple, but the coupling is not solid and rotation is prevented
Solution Approach 1:
The invention uses an asymmetric T-shaped interface where the tool bit has a vertical protrusion that fits into a horizontal recess in the mandrel. This asymmetric geometry provides both simple coupling and solid mechanical engagement for reliable rotation, replacing the symmetric ball-based coupling system.
3Stability of the object's composition
If the tool shank is fixed in line with the tool stem, then the coupling is stable, but the tool cannot be tilted to various angular positions
Solution Approach 1:
The control ferrule is designed to be slidable along the tool shank, allowing dynamic adjustment between two positions: engaged with the tool stem for stable axial alignment, and disengaged to allow tilting to various angular positions. This dynamic positioning system provides both stability and versatility as needed.
Solution Approach 2:
The control ferrule is segmented into distinct engagement zones: one that engages with the tool stem for axial stability and another that allows angular freedom. This segmentation enables the single component to provide both fixed and tilted operational modes.
4Adaptability or versatility
If the tool stem has a reduced diameter neck portion, then the tool can be operated in tighter spaces, but the structural strength is reduced
Solution Approach 1:
The tool stem features a localized reduced-diameter neck portion only in the region where space constraints exist, while the upper and lower portions maintain full diameter for structural strength. This local modification allows access to confined spaces without compromising the overall structural integrity of the tool stem.
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
Enables secure and efficient operation of tool shanks and fasteners at various angles, allowing the tool stem to be rotated and used in confined spaces without the need for additional levers, enhancing usability and coupling stability.
Implementation Method 1
a spring-biased projection device engaged in the extension of the tool stem and partially extend out of the tool stem for selectively engaging with the handle and for selectively anchoring the handle to the tool stem
Implementation Method 2
at least one magnetic member disposed in the tool shank for attracting the spatial engaging member of the tool stem to the tool shank
Data Source
AI summary
A driving tool includes a tool stem having a non-circular spatial engaging member and having one or more flat surfaces, a tool shank having a non-circular socket opening and having one or more curved surfaces for pivotally receiving the spatial engaging member of the tool stem and for allowing the tool shank to be selectively tilted relative to a longitudinal axis of the tool stem. A control ferrule is slidably engaged onto the tool shank and slidable and engageable onto the tool stem for retaining the tool shank in line with the longitudinal axis of the tool stem and for preventing the tool shank from being tilted relative to the tool stem to other angular position.