Handheld Sanding Device Cam Lock Mechanism
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Solution Overview
Problem
Existing handheld power tools require separate fasteners and additional tools, such as screwdrivers, to secure removable accessories, which complicates the attachment and detachment process.
Innovation Solution
A locking mechanism that includes a cam member and a slot system, allowing for secure attachment and detachment of removable accessories without the need for additional fasteners, utilizing a T-shaped configuration to provide rigidity and alignment, and a cam member to facilitate easy switching between different accessory types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a screw and separate fastener are used to secure the removable accessory, then the connection strength is improved, but the device complexity and ease of operation deteriorate due to requiring additional tools and steps
Solution Approach 1:
The cam member is integrated directly into the platen body, eliminating the need for separate fasteners and screws. The cam member and slot system are merged into a unified attachment mechanism that provides both connection strength and ease of operation through a single integrated component rather than multiple separate parts
Solution Approach 2:
The cam member is designed to be manually operated by the user without requiring external tools. The cam member rotates in response to user pressure, automatically engaging with the slot system to secure the accessory, thereby making the attachment mechanism self-sufficient and eliminating dependency on separate fastening tools
2Reliability
If a screw and separate fastener are used to secure the removable accessory, then the connection reliability is improved, but the ease of operation deteriorates due to requiring additional tools
Solution Approach 1:
The cam member functions as a self-contained attachment mechanism that the user can operate directly with their hand. When pressure is applied during sanding, the cam member automatically rotates and locks into position, providing reliable attachment without requiring the user to manually manipulate separate fasteners or use additional tools
Solution Approach 2:
The cam member transitions from a static component to a dynamic one that rotates in response to applied pressure. This dynamic movement allows the cam member to automatically engage with the slot system, transforming the attachment process from a manual multi-step operation to an automatic single-action process that maintains reliability while improving ease of operation
3Adaptability or versatility
If multiple separate fasteners are used, then the adaptability for different accessory types is improved, but the productivity deteriorates due to time-consuming attachment and detachment
Solution Approach 1:
The cam member and slot system are designed as a universal attachment mechanism that can accommodate multiple types of removable accessories. The standardized slot configuration allows different accessories to be attached using the same cam member, providing versatility while enabling quick interchangeability through a single rotational motion rather than multiple fastening steps
Solution Approach 2:
The attachment mechanism is segmented into distinct functional components: the cam member for actuation, the slot system for positioning, and the removable accessory with engagement features. This segmentation allows each component to be optimized for its specific function while working together to enable rapid accessory changes. The slot system can be configured in different patterns to accommodate various accessory types, maintaining versatility through modular design
Data Source
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AI summary
A handheld power tool (100) and a removable accessory (112), which is changeable without requiring extra tools. The handheld power tool (100) includes a platen (110) having an aperture (122) therein and a locking mechanism (114) coupled with the platen (110). The locking mechanism (110) includes a cam member (146). The removable accessory (112) includes a tab (115) that fits into the aperture (122) and that is engagable by the cam member (146) to bias the removable accessory (112) into abutting contact with the platen (110) to securely couple the removable accessory (112) with the tool (100).