Spring-Biased Bit Holder for One-Handed Tool Bit Changes
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Solution Overview
Problem
Existing rotary power tools require two-handed operations for changing tool bits, which is inefficient and undesirable in certain applications.
Innovation Solution
A bit holder with a spring-biased collar and retaining members that allows single-handed operation for securing and releasing tool bits using a movable collar mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a traditional collar-based bit holding device is used, then the tool bit can be retained securely, but two hands are required to change the tool bit which reduces operational efficiency
Solution Approach 1:
The spring mechanism automatically returns the collar to its original position after the tool bit is inserted or removed, eliminating the need for manual resetting. The system serves itself by using the insertion/removal action to trigger the spring's compression and expansion, which automatically repositions the collar for the next operation.
Solution Approach 2:
The collar is designed to be movable along the longitudinal axis under spring bias, transitioning between different positions dynamically. The spring provides continuous force to move the collar between the first position (for insertion) and second position (for retention), enabling automatic adaptation to the operational state without manual intervention.
2Reliability
If the collar is moved to secure the tool bit, then the tool bit is retained firmly, but the same action must be reversed to release it which slows down the process
Solution Approach 1:
The spring is pre-compressed or pre-positioned to automatically counteract the collar's movement after tool bit insertion. When the tool bit is inserted, it compresses the spring; when removed, the spring's stored energy automatically pushes the collar back to its initial position, preparing the system in advance for the next operation without requiring additional manual actions.
Solution Approach 2:
The collar undergoes periodic movement between two positions: moving forward to secure the tool bit and automatically returning to the initial position via spring force. This periodic cycle of securing and resetting occurs automatically with each tool bit change, reducing the time required for each operation cycle.
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
Enables efficient, single-handed tool bit changes, improving operational speed and convenience in power tool usage.
Implementation Method 1
The collar is disposed on the body and is biased toward the first end of the body by the spring
Data Source
AI summary
A bit holder includes a body, a spring, a retaining member, and a collar. The body includes a first end and a second end. The body defines a longitudinal bore configured to receive a tool bit and an opening in communication with the longitudinal bore. The spring is disposed on the body. The retaining member is disposed in the opening and is configured to selectively extend into the longitudinal bore to retain the tool bit within the longitudinal bore. The collar is disposed on the body and is biased toward the first end of the body by the spring. The collar is movable in a direction along the body against the spring to secure the tool bit within the longitudinal bore. The collar is movable further in the direction along the body against the spring to enable the bit holder to release the tool bit from the longitudinal bore.