Flexible Spindle Lock Mechanism for Faster Tool Changes
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Solution Overview
Problem
Existing electric power tools often have a front end that becomes uncomfortably hot during operation, requiring users to stop working and wait for it to cool down, and their spindle locks can be cumbersome and time-consuming to use.
Innovation Solution
A spindle lock mechanism that utilizes airflow from the motor housing to cool the handle end and an improved spindle lock design attached to the gear case, which includes an actuator for convenient locking and unlocking of the spindle, allowing for efficient cooling and easy accessory changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the front end of the power tool is used during operation, then productivity is improved, but the temperature of the front end increases making it uncomfortable to hold
Solution Approach 1:
The patent introduces an airflow channel system as an intermediary between the motor housing and front end. This channel directs cooling air from the motor housing through the front end, transferring heat away from the handle area and reducing its temperature to comfortable levels while maintaining continuous operation capability
2Reliability
If a manually operated spindle lock is used to prevent spindle rotation, then the spindle can be locked against rotation, but the locking mechanism becomes cumbersome and time-consuming
Solution Approach 1:
The patent implements a spring-loaded spindle lock mechanism that automatically engages with the spindle when the tool is activated. The spring provides automatic locking action without requiring manual intervention, thereby maintaining reliable spindle locking while eliminating the time loss associated with manual locking operations
Solution Approach 2:
The spindle lock mechanism is pre-positioned and spring-loaded to be ready for immediate engagement. The locking action is prepared in advance through the spring mechanism, allowing the spindle to be locked or unlocked instantly when needed, rather than requiring time-consuming manual adjustment
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 airflow cooling system reduces the temperature of the handle end, enhancing user comfort and the spindle lock mechanism simplifies the process of locking and unlocking the spindle, improving operational efficiency and convenience.
Implementation Method 1
at least a portion of the airflow from the motor housing is introduced along an airflow path into the front end to facilitate cooling of the front end
Data Source
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AI summary
A spindle lock (132) for an electric power tool, the electric power tool comprising an electric motor (16) mounted within a motor housing and a spindle (18) mounted within a gear case (30) for rotation about an axis, the spindle driven by the electric motor, the spindle lock comprising of an elongated flexible member having a middle member (150) located between first and second connecting members (136, 140), wherein the first connecting member (136) is engaged with a corresponding surface (138) of the gear case (30) and the second connecting member (140) is engaged with a corresponding surface of the spindle to lock the spindle against rotation about the axis.