Chuck Sleeve Design for Power Tool Grip and Dust Protection
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Solution Overview
Problem
Existing chuck assemblies for power tools lack an effective surface for user grip, leading to difficulties in securely attaching and detaching drill bits or accessories, and there is a continuous need for improvement in their design to enhance usability and torque application.
Innovation Solution
A chuck sleeve design that annularly surrounds the bearing assembly, featuring a radially inwardly extending flange and elongated gripping members, allowing for increased surface area for user grip and torque application without increasing the tool's length, while maintaining a compact form. The chuck sleeve overlaps the bearing assembly, providing a significant gripping area and preventing dust entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the chuck sleeve is designed with a larger gripping surface area, then user grip and torque application are enhanced, but the tool length increases
Solution Approach 1:
The chuck sleeve is designed to overlap and surround the bearing assembly, nesting the gripping surface area within the existing tool structure. This allows the chuck sleeve to provide an extended gripping surface without proportionally increasing the overall tool length, as the gripping area is distributed around the bearing assembly rather than extending linearly.
Solution Approach 2:
Instead of increasing gripping surface area by extending the tool length in one dimension, the invention distributes the gripping surface area around the bearing assembly in a radial/annular dimension. The chuck sleeve's outer surface provides the gripping area while the annular configuration allows this surface area to be achieved within a compact axial length.
2Area of moving object
If the chuck sleeve overlaps the bearing assembly to provide gripping area, then user grip is improved, but dust may enter the bearing assembly
Solution Approach 1:
A seal is introduced as an intermediary element between the chuck sleeve and the bearing assembly. This seal prevents dust and contaminants from entering the bearing assembly through the gap created by the overlapping configuration, while allowing the chuck sleeve to maintain its extended gripping surface area.
3Reliability
If the chuck assembly is designed for secure attachment of drill bits, then reliability is improved, but device complexity increases
Solution Approach 1:
The chuck jaws are designed with self-centering features that allow them to automatically align and secure the drill bit without requiring complex adjustment mechanisms. The jaws move radially inward to grip the drill bit shank, and the self-centering geometry ensures proper alignment, reducing the need for additional alignment devices or complex control systems.
Data Source
AI summary
A power tool is provided and includes a housing, a motor, a gear case, a bearing assembly, and a chuck assembly. The motor is disposed in the housing and defines an axis of rotation. The gear case is coupled to the motor and includes a proximal end and a distal end. The proximal end of the gear case is coupled to the housing. The bearing assembly extends from the distal end of the gear case along the axis of rotation and supports a driveshaft for rotation about the axis of rotation. The chuck assembly is rotatably coupled to the driveshaft and includes a chuck sleeve annularly surrounding the bearing assembly about the axis of rotation.