Right-Angle Power Tool Attachment With Magnetic Bit Retention
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Solution Overview
Problem
Existing right angle attachments for power tools are not compact enough to reach into very tight spaces, lack durability, and have inadequate fastener retention, making them unsuitable for use in tight spaces with impact tools.
Innovation Solution
A right angle attachment with a housing and gear case design that includes a first and second right angle gear, a floating magnet head for enhanced fastener retention, and a magnet within the gear case to magnetize the hex bit, allowing for easy bit replacement and improved ergonomics for user comfort, enabling operation in tight spaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If existing right angle attachments are used, then they can perform drilling or fastener insertion, but they are not compact enough to reach into very tight spaces
Solution Approach 1:
The attachment is divided into distinct functional segments: a compact gear case housing the right angle gears, a separate handle portion for user grip, and a bit receiving section with the polygonal opening. This segmentation allows each component to be optimized independently, resulting in an overall more compact design that can access tight spaces while maintaining operational capability
Solution Approach 2:
The attachment utilizes a right angle (90-degree) gear configuration that changes the dimensional orientation of the output shaft relative to the input shaft. This dimensional change allows the tool to access fasteners in tight spaces that are perpendicular to the drill axis, effectively using spatial reorientation to overcome size constraints
2Reliability
If existing right angle attachments are used, then they can be operated, but they lack durability for use with impact tools
Solution Approach 1:
The attachment employs composite construction combining metal components (gear case, gears, input shaft) for structural strength and durability, with polymer or plastic elements (handle portion, bit retention mechanism) for lightweight operation and impact absorption. This composite approach provides the necessary strength to withstand impact forces while maintaining overall reliability
Solution Approach 2:
The floating magnet head design incorporates magnetic retention that can accommodate impact forces without transmitting excessive stress to the bit or gear teeth. The magnetic field provides a cushioning effect that absorbs sudden impacts, protecting the mechanical components from damage during impact tool operation
3Reliability
If existing right angle attachments are used, then they can hold bits, but they have inadequate fastener retention
Solution Approach 1:
The attachment replaces traditional mechanical bit retention methods (such as set screws or clamp mechanisms) with a magnetic field-based retention system. The magnet disposed in the gear case creates a magnetic field that holds the hex bit securely in the polygonal opening, providing reliable fastener retention through magnetic attraction rather than mechanical clamping forces
Solution Approach 2:
The floating magnet head design allows the magnet to move or float within the gear case, changing its position parameter to optimize the magnetic field distribution and maximize retention force on the fastener. This parameter change enables the magnetic field to adapt to different fastener positions and maintain optimal holding force
4Ease of operation
If existing right angle attachments are used, then bits can be retained, but bit replacement is difficult
Solution Approach 1:
The magnetic retention system replaces mechanical bit locking mechanisms, allowing bits to be easily removed by simply pulling them out of the polygonal opening against the magnetic force. This eliminates the need for tools or complex release mechanisms, significantly reducing bit replacement time and improving operational efficiency
Solution Approach 2:
The magnetic field automatically retains the bit during operation without requiring active engagement mechanisms, and automatically releases the bit when removal force is applied. This self-service characteristic simplifies bit replacement to a simple pull motion, eliminating the need for additional steps or tools
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides improved durability, reduced profile, and superior fastener retention, allowing the attachment to effectively drill or insert fasteners in the tightest spaces with power tools, enhancing user comfort and operational efficiency.
Implementation Method 1
an additional magnet can be disposed within the gear case at the base of the hex bit in order to magnetize the hex bit and further enhance the retention of the fastener therein
Implementation Method 2
A floating magnet head can surround the hex bit to aid in fastener retention
Data Source
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AI summary
A right angle attachment for a power tool, comprising a housing including a handle and a gear case attached to the handle; an input shaft extending through the handle; a first right angle gear rotatably mounted within the gear case and drivingly attached to said input shaft; a second right angle gear rotatably mounted within the gear case and meshingly engaged with said first right angle gear, said second right angle gear having a polygonal opening therein adapted for receiving a tool bit; and characterized in that the right angle attachment further comprises a bit release device supported by said gear case and in communication with said polygonal opening in said second right angle gear.