Side Handle Locking Mechanism for Depth Stop Adjustment
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Solution Overview
Problem
Existing side handles for handheld power tools lack a mechanism that allows for easy and secure adjustment of a depth stop feature, which is crucial for precise control during operations like drilling, as they either fail to provide sufficient locking security under axial load or are difficult to adjust.
Innovation Solution
A side handle design featuring a movable rod with a toothed longitudinal side and a locking block guided by an inclined surface within a hollow rail, where the locking block is spring-preloaded to engage securely with the rod's toothing, allowing for easy adjustment and enhanced locking stability under axial load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a locking block with toothed side engagement is used to secure the rod, then the locking reliability under axial load is improved, but the ease of adjustment becomes worsened due to increased friction and engagement resistance
Solution Approach 1:
The locking block is designed with a movable guided side that transitions between engaged and disengaged states. During adjustment, the guided side is disengaged from the rail, allowing the rod to move freely. When locking is required, the guided side engages with the rail's guide surface, automatically pushing the locking block into the toothed engagement position. This dynamic state change enables both easy adjustment and secure locking.
Solution Approach 2:
The inclined guide surface of the hollow rail acts as an intermediary between the locking block and the rod. When the rod moves axially, the guide surface converts this motion into lateral movement of the locking block, forcing it into or out of the toothed engagement position. This intermediary mechanism automates the locking/dislocking process without requiring direct user manipulation of the locking block itself.
2Reliability
If the locking block is spring-preloaded into the locking position, then the locking stability under axial load is improved, but the force required to disengage becomes worsened
Solution Approach 1:
The system dynamically switches the preloading condition based on operational state. During normal operation, the spring maintains continuous preloading for stable locking. During adjustment, the guided side disengages from the rail, releasing the mechanical constraint that allows the spring force to be overcome easily. This dynamic release of constraint enables disengagement despite spring preloading.
Solution Approach 2:
The spring is preloaded in advance to maintain the locking block in the engaged position, ensuring immediate locking stability when needed. The guided side is positioned in advance to engage with the rail's guide surface, which will automatically push the locking block into full engagement when the rod moves, preparing the system for secure locking before axial loads are applied.
3Extent of automation
If the guided side or guide surface has an inclined flank with respect to the rod axis, then the automatic engagement of the locking block is improved, but the complexity of the mechanism becomes worsened
Solution Approach 1:
The hollow rail serves multiple functions: it acts as a structural support element, provides the guide surface for the locking block, and incorporates the inclined flank that automates the engagement process. By combining these functions into a single component, the design achieves automatic engagement without adding separate complex mechanisms.
Solution Approach 2:
The inclined flank changes the geometric parameters of the guide surface relative to the rod axis. This angular parameter enables the conversion of axial rod movement into lateral locking block movement, automating the engagement process. The specific inclination angle optimizes the force transmission while maintaining simplicity in the overall mechanism design.
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 secure and effortless adjustment of the depth stop, ensuring the rod remains locked during operation, even under significant axial forces, while allowing for easy disengagement with minimal user effort, thus enhancing operational precision and safety.
Implementation Method 1
A spring pretensions the locking block in the locking position
Implementation Method 2
The guided side or the guide surface or both surfaces have at least one flank inclined with respect to the rod axis in such a manner that the locking block in a movement along the rod axis is forced in the direction of the rod
Implementation Method 3
the toothed side engages in the toothed longitudinal side
Data Source
AI summary
A rail has a guide surface on which the locking block is guided in a bearing manner between a position locking the bar, in which the toothed side engages in the toothed long side, and an unlocked position, in which the toothed side is not engaged with the toothed long side. A spring pretensions the locking block into the locking position. The guided side and/or the guide surface have a flank that is inclined with respect to the bar axis such that the locking block is forced in the direction of the bar in the event of a movement along the bar axis.