Rotary Tool Attachment Interface with Anti-Rotation Keys
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Solution Overview
Problem
Existing attachment interfaces for handheld rotary power tools lack convenience, efficiency, and ease of use, particularly in terms of secure mounting, adjustability, and user safety during various applications.
Innovation Solution
An attachment interface with a nose portion, transition portion, and screw threads for secure attachment, along with complementary keys and recesses to prevent rotation, allowing for tool-less assembly and disassembly, and enabling angular positioning of attachment devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If traditional attachment interfaces are used, then attachment devices can be mounted on the tool, but the attachment and disassembly process is time-consuming and requires tools
Solution Approach 1:
The attachment interface is divided into separate functional elements: a quick-release mechanism with movable locking members, screw threads for secure mounting, and keys for rotational prevention. This segmentation allows the attachment device to be quickly attached by engaging the quick-release mechanism without requiring tools for the entire attachment process.
Solution Approach 2:
The locking members are pre-positioned in the interface to automatically engage with corresponding features on the attachment device when brought together. This preliminary positioning enables tool-less attachment, as the locking action occurs automatically upon engagement rather than requiring manual operation during attachment.
2Reliability
If attachment devices are securely mounted to the tool, then reliability is improved, but the attachment device may rotate during operation
Solution Approach 1:
Keys with asymmetric cross-sectional shapes are provided in the attachment interface, which engage with complementary asymmetric keys in the attachment device. This asymmetric keying system prevents rotational movement while maintaining secure mounting, as the asymmetric geometry only fits in one rotational orientation.
Solution Approach 2:
The anti-rotation keys extend in a direction perpendicular to the primary attachment axis, adding a rotational dimension of constraint to the mounting system. This multi-dimensional constraint system provides both axial securing and rotational prevention simultaneously.
3Ease of operation
If the attachment interface is simplified for easy use, then ease of operation is improved, but adjustability and positioning capabilities are reduced
Solution Approach 1:
The attachment interface integrates multiple functions into a single unified structure: quick-release capability for easy operation, screw threads for secure mounting, asymmetric keys for anti-rotation, and features that allow angular positioning. This multi-functional design provides adjustability and positioning capabilities without requiring separate mechanisms for each function.
Solution Approach 2:
The quick-release mechanism, locking system, anti-rotation keys, and positioning features are merged into a single integrated attachment interface. This consolidation allows all adjustment and positioning capabilities to be accessed through one unified interface, maintaining ease of operation while providing comprehensive adaptability.
Data Source
AI summary
Embodiments of the present invention are directed to an attachment interface for a handheld power tool having an elongated housing and a rotary output shaft, the interface comprising a nose portion having a generally cylindrically shaped wall extending in the direction of the center axis to a flat annular surface, a plurality of screw threads formed in an outer surface of the wall configured to have an attachment device with a screw threaded collar mounted on the interface, and a first plurality of keys formed in an inner surface of the wall configured to receive have an attachment device with a second plurality of complementary keys, the engaged keys preventing rotation of the attachment device when the attachment device is mounted on the interface.