Drill Chuck Attachment Centering Ring for Improved Concentricity
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Solution Overview
Problem
Existing drill chuck attachments for hand-held power tools suffer from inadequate concentricity, leading to potential damage due to imbalances during operation.
Innovation Solution
A cone-shaped centering aid, designed as a ring with a beveled outer circumference, is used for axial centering on the hand-held power tool's fastening interface, providing a stable and low-wear connection by engaging with a complementary funnel-shaped centering aid, thus ensuring improved concentricity and reducing the risk of imbalance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a drill chuck attachment is centered exclusively via the drive shaft in the tool holder, then the attachment can be secured against rotation, but the concentricity properties are inadequate leading to imbalance and potential damage
Solution Approach 1:
The centering function is segmented from the drive shaft connection and implemented through a separate centering aid with complementary geometric shapes. The fastening unit includes a centering element with a first geometric shape that engages with a corresponding centering element on the fastening interface, providing dedicated axial centering independent of the drive shaft's rotational securing function.
Solution Approach 2:
A centering aid with complementary geometric shapes acts as an intermediary between the fastening unit and the fastening interface. This intermediary element provides the axial centering function that was previously inadequate, mediating between the drive shaft connection and the attachment to ensure proper alignment and reduce imbalance.
2Manufacturing precision
If a complex centering mechanism is added to improve concentricity, then axial centering becomes more accurate, but the device complexity and manufacturing cost increase
Solution Approach 1:
The centering is achieved by changing the geometric parameters of the fastening unit and fastening interface. Complementary geometric shapes (such as conical surfaces, cylindrical bores, or keyed profiles) are integrated into the existing components, allowing axial centering through form-fitting engagement rather than through complex adjustable mechanisms.
Solution Approach 2:
The centering function is merged with the existing fastening unit structure. The centering aid is formed as an integral part of the fastening unit or the fastening interface, combining the centering function with the rotational securing function in a unified, simplified design that reduces overall complexity.
Data Source
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AI summary
The attachment has a mounting unit for mounting on a mounting interface (150) of a hand-held machine tool (100) to protect against twisting. A centering assistance (153) is provided on the mounting unit for axial centering of the mounting unit on the mounting interface. The centering assistance is formed sectionally in the form of a ring whose outer circumference is beveled in selected areas. A clamping-chuck unit is rotationally mounted on the mounting unit. The centering assistance is formed at an axial end area of the mounting unit. An independent claim is also included for a tool system.