Power Tool Attachment Mechanism With Accessory-Specific Gearing
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Solution Overview
Problem
Rotary power tools lack customization for different accessories, as the same drive system is used for various types and sizes, which may not optimize torque, speed, or gear ratios for specific tools, and the attachment mechanism is not user-friendly.
Innovation Solution
A power tool system with a customizable attachment mechanism that includes a tool-side and accessory-side attachment mechanism, allowing for axial coupling and featuring a gear arrangement within the accessory to optimize torque and speed, along with a user-friendly locking actuator for easy attachment and detachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the same drive system is used for different types and sizes of accessories, then the power tool maintains simplicity and universality, but the torque, speed, and gear ratio optimization for specific accessories is compromised
Solution Approach 1:
The drive system is segmented into modular components: a common motor unit in the base and accessory-specific gear arrangements in each accessory. This allows each accessory to have its own optimized transmission system while sharing the common motor, resolving the contradiction between universality and customization.
Solution Approach 2:
The system transitions from a static, fixed drive configuration to a dynamic, configurable one where different gear arrangements can be attached to the same motor output. The motor adapts its operation to match the requirements of different accessories through the interchangeable gear systems.
2Reliability
If a complex attachment mechanism is used to securely couple accessories, then the connection reliability is improved, but the ease of operation for users is worsened
Solution Approach 1:
The locking lugs and slots are designed with curved, arc-shaped geometries that guide the accessory into proper alignment during attachment. The curved surfaces provide self-centering action, making the attachment process intuitive and secure while remaining simple to operate.
Solution Approach 2:
The attachment mechanism is designed to be self-aligning and self-locking. The arc-shaped locking slots automatically guide the locking lugs into position, and the spring-loaded actuators automatically engage the locked position when the accessory is attached, eliminating the need for complex manual adjustment or multiple steps.
3Device complexity
If the accessory-side attachment mechanism is fixed relative to the housing, then the structural simplicity is improved, but the ability to engage with the tool-side mechanism is worsened
Solution Approach 1:
The accessory-side attachment mechanism incorporates limited rotational freedom, allowing it to pivot relative to the housing. This dynamic capability enables the locking lugs to align with and engage the arc-shaped slots on the tool-side mechanism, providing both simplicity and engagement capability.
Data Source
AI summary
A power tool system including a power tool base having a main body, an electric including an output, and a tool-side attachment mechanism coupled to the main body, the tool-side attachment mechanism having a tool-side locking lug and a tool-side slot adjacent the tool side locking lug. An accessory is configured to be selectively coupled to the power tool base and includes an accessory-side attachment mechanism having an accessory-side locking lug and an accessory-side slot, the accessory-side locking lug selectively engagable with the tool side slot and the accessory-side slot selectively engagable with the tool-side locking lug, a gear arrangement configured to be operably coupled to the output of the electric motor to receive torque from the electric motor, and a tool holder configured to be driven by the gear arrangement. The accessory-side attachment mechanism selectively engages the tool-side attachment mechanism to axially couple the accessory to the power tool base.