Screwdriver Handle Retaining Unit with Resilient Arms
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Solution Overview
Problem
Conventional exchangeable screwdriver tool handles fail to prevent axial movement of the tool shank, leading to inconvenient and potentially dangerous usage as the shank can slide out during operation.
Innovation Solution
The tool handle incorporates a retaining unit with a noncircular retaining hole and resilient arms that engage with the tool shank to prevent axial movement, allowing easy detachment by retracting the resilient arms when pressed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the tool handle uses a simple open cavity for receiving the tool shank, then the device complexity is reduced and ease of manufacture is improved, but the reliability deteriorates because the tool shank can axially move and slide out during operation
Solution Approach 1:
The retaining unit employs resilient arms that can dynamically change their engagement state with the tool shank. These arms are biased to engage the shank and prevent axial movement, but can be deactivated by pressing the control button to allow detachment. This dynamic mechanism resolves the contradiction by providing reliable retention during use while enabling easy tool shank exchange when needed.
Solution Approach 2:
The resilient arms automatically engage with the tool shank upon insertion, providing self-locking retention without requiring additional fastening operations. The system serves itself by using the insertion action to trigger the engagement of the resilient arms, which then maintain retention reliability throughout operation until deliberately released.
2Reliability
If the tool handle includes a retaining unit with resilient arms and control mechanism, then the reliability is improved by preventing axial movement, but the device complexity increases
Solution Approach 1:
The retaining unit is segmented into distinct functional components: resilient arms for retention, a control button for activation, and a transmission mechanism for force transfer. This segmentation allows each component to be optimized independently and simplifies the overall design by distributing functions across separate elements rather than requiring a complex integrated mechanism.
Solution Approach 2:
The transmission mechanism acts as an intermediary between the control button and the resilient arms. When the button is pressed, it transfers force through this intermediary mechanism to activate the resilient arms, which then release the tool shank. This intermediary structure enables reliable control with minimal complexity by providing a clear force transmission path.
3Reliability
If the resilient arms are designed to strongly engage the tool shank, then the retention reliability is improved, but the ease of operation deteriorates because detachment becomes difficult
Solution Approach 1:
The resilient arms are pre-biased to engage the tool shank with sufficient force to prevent axial movement during operation. This preliminary engagement action ensures reliability throughout the working cycle. The control button provides a counter-action that overcomes this engagement force only when needed for detachment, resolving the contradiction between strong engagement and easy release.
Solution Approach 2:
The engagement force of the resilient arms is dynamic rather than static. During normal operation, the arms maintain strong engagement to prevent axial movement. When the control button is pressed, the arms transition to a disengaged state, allowing easy detachment. This dynamic behavior resolves the contradiction by providing strong retention when needed and easy release when activated.
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 effectively prevents axial movement of the tool shank, enhancing user safety and convenience by ensuring secure engagement and easy tool shank exchange.
Implementation Method 1
The control unit has at least one resilient arm extending therefrom. The at least one resilient arm passes the recess and is abutted against the at least one connecting portion to selectively extend to the retaining hole.
Data Source
AI summary
A tool handle for an exchangeable screwdriver includes a handle, a retaining unit and a control unit. The retaining unit is mounted in one end of the handle. The retaining unit has a retaining hole defined therein and extending therethrough. The retaining unit has a recess defined in a lateral thereof and communicated with the retaining hole. The retaining unit has at least one connecting portion disposed between the recess and the retaining hole. The control unit is received in the recess. The control unit has at least one resilient arm extending therefrom. The at least one resilient arm passes the recess and is abutted against the at least one connecting portion to selectively extend to the retaining hole.