Hole Saw Arbor With Collapsible Stem for Secure Thread Release
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Solution Overview
Problem
Existing hole saw arbors lack an efficient mechanism for easily and securely attaching and detaching hole saws, leading to difficulties in adjusting the arbor stem size for different hole saws and potential damage during removal.
Innovation Solution
An adjustable arbor mechanism featuring a collar and pins that move relative to the arbor shaft, allowing the arbor stem to expand or collapse, facilitated by biasing members and actuators, enabling easy attachment and detachment of hole saws by adjusting the stem's circumference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed-size arbor stem is used, then the structure is simple, but it cannot accommodate different hole saw sizes
Solution Approach 1:
The arbor stem is designed with movable arms that can adjust their radial position relative to the longitudinal axis. The arms are connected to the arbor shaft through a mechanism involving pins, slots, and springs, allowing the stem circumference to dynamically change between expanded and collapsed states to accommodate different hole saw sizes while maintaining a relatively simple overall structure
2Reliability
If a threaded connection is used, then the hole saw can be securely attached, but it is difficult to remove without risk of damage
Solution Approach 1:
The connection mechanism transitions from a static threaded connection to a dynamic system where the arbor stem can collapse radially. The arms move inward toward the longitudinal axis upon actuation, automatically disengaging the threaded connection and allowing easy removal of the hole saw while maintaining secure attachment during operation through the expanded stem configuration
3Adaptability or versatility
If the arbor stem is expanded to accommodate larger hole saws, then versatility is improved, but the device size increases
Solution Approach 1:
The arbor stem employs a collapsible design where the arms can be positioned in an expanded configuration to accommodate larger hole saws when needed, and then collapsed inward toward the longitudinal axis when not in use. This dynamic volume adjustment allows the arbor to adapt to different hole saw sizes while minimizing its overall size during storage or transport
Solution Approach 2:
The arms of the arbor stem are designed to nest or fold inward toward the longitudinal axis when not supporting a hole saw. The pins and slots mechanism allows the arms to be positioned within the central region of the arbor shaft, creating a compact nested configuration that reduces the overall volume while maintaining the capability to expand when needed
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 mechanism allows for secure attachment and easy removal of hole saws, preventing damage and accommodating various hole saw sizes through adjustable arbor stem circumference, enhancing user convenience and tool longevity.
Implementation Method 1
a biasing member coupled to the plurality of arms
Data Source
AI summary
An arbor for a hole saw includes an arbor shaft configured to be coupled to a power tool. The arbor shaft defines a longitudinal axis. The arbor also includes an arbor stem supported by the arbor shaft. The arbor stem includes at least one arm having a threaded portion configured to engage the hole saw. The arbor further includes an actuator supported by the arbor shaft. The actuator is operable to move the threaded portion of the at least one arm relative to the longitudinal axis.