Drum Tool Magazine Blocking Mechanism
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Solution Overview
Problem
Existing hand-held power tools with drum-like tool change magazines and slide-over elements suffer from reduced functionality and operational safety due to intermediate positions that hinder tool change and operation, limiting the tool's effectiveness.
Innovation Solution
A hand-held power tool design featuring a drum-like tool change magazine with a slide-over element coupled to a manual switch containing a resilient blocking element, including a spring arm with a latch and guide curve, which automatically displaces to prevent undesired intermediate positions and ensure reliable tool change and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a slide-over element is provided for pushing a tool from a tool chamber into a tool holder, then tool changing capability is improved, but intermediate positions during sliding reduce operational safety and functionality
Solution Approach 1:
The resilient blocking element is pre-positioned to automatically engage with the slide-over element at predetermined positions. As the slide-over element moves during tool changing, the blocking element proactively blocks intermediate positions before they can cause operational issues, ensuring only safe positions (tool chamber aligned or tool holder engaged) are accessible.
Solution Approach 2:
The resilient blocking element acts as an intermediary between the slide-over element and the tool changing mechanism. It mediates the sliding motion by selectively blocking certain positions, allowing the slide-over element to move freely only when safe, while preventing movement into hazardous intermediate positions without requiring complex control systems.
2Reliability
If a resilient blocking element with spring arm and latch is added to prevent intermediate positions, then operational reliability is improved, but device complexity increases
Solution Approach 1:
The resilient blocking element is designed to be self-actuating through its spring arm and latch mechanism. As the slide-over element moves during tool changing, the blocking element automatically engages or disengages based on the position reached, without requiring external actuators, sensors, or control systems. The spring force provides the necessary blocking action inherently.
Solution Approach 2:
The blocking element uses simple, inexpensive components such as a spring arm, latch, and guide curve instead of complex mechanical linkages or electronic control systems. These simple components are easy to manufacture and replace, providing reliable blocking functionality at low cost and complexity.
3Adaptability or versatility
If automatic displacement of manual switch is implemented via triggering point on guide curve, then functionality is improved, but manufacturing precision requirements increase
Solution Approach 1:
The guide curve is designed with a specific geometric form that includes a triggering point which causes automatic displacement of the manual switch. By carefully designing the shape and position of this triggering point on the guide curve, the system achieves automatic position switching without requiring high-precision manufacturing throughout the entire mechanism. The critical precision is localized to the triggering point geometry.
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
This design enhances operational reliability by allowing simple and cost-effective releasable blocking of the push-over element in tool-changing and operating positions, preventing displacement into undesired intermediate positions and ensuring safe and reliable tool operation.
Implementation Method 1
a resilient blocking element which has at least one spring arm which is provided with an associated latch
Implementation Method 2
the spring arm being designed to trigger automatic displacement of the manual switch when the triggering point is exceeded by the latch
Data Source
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AI summary
In a hand-held power tool (100) with a tool holder (104) designed to receive a tool (101), which is arranged on an associated tool housing (124) in which a drum-like tool changer magazine (102) with at least one tool chamber (199) for storing the tool (101) is provided, which can be aligned with the tool holder (104), wherein a sliding element (150) movable in the longitudinal direction (108) of the tool holder (104) is provided for sliding the tool (101) from the tool chamber (199) into the aligned tool holder (104) or from the tool holder (104) into the aligned tool chamber (199), the sliding element (150) is coupled to an actuable hand switch (120) which has a spring-loaded locking element (250) designed to prevent the sliding element from moving. (150) to be releasably blocked in a tool change position or a tool operating position.