Sliding Block Locking Mechanism for Motor-Driven Tool
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Solution Overview
Problem
Existing motor-driven power tools with rotary hammer and chisel modes require complex and costly mechanisms to lock the drill sleeve for non-rotational chisel operations, which complicates manufacturing and increases costs.
Innovation Solution
A sliding block with internal teeth engages with a retaining ring having complementary external teeth, forming an involute gearing system that locks the drill sleeve non-rotatably in chisel mode, eliminating the need for additional components and simplifying the locking mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional components are added to lock the drill sleeve non-rotatably in chisel mode, then the locking function is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The sliding block's internal toothing is designed to serve dual purposes: transmitting rotational motion during hammer drill mode and providing locking engagement during chisel mode. This multi-functionality eliminates the need for separate locking components, resolving the contradiction between reliable locking and device simplicity.
Solution Approach 2:
The locking function is merged with the existing sliding block mechanism by integrating internal toothing into it. This combines the motion transmission function and locking function into a single component, reducing device complexity while maintaining reliable locking in chisel mode.
2Reliability
If additional components are added to lock the drill sleeve non-rotatably in chisel mode, then the locking function is improved, but the manufacturing cost increases
Solution Approach 1:
The sliding block's internal toothing is designed to serve dual purposes: transmitting rotational motion during hammer drill mode and providing locking engagement during chisel mode. This multi-functionality eliminates the need for separate locking components, resolving the contradiction between reliable locking and device simplicity.
Solution Approach 2:
The locking function is merged with the existing sliding block mechanism by integrating internal toothing into it. This combines the motion transmission function and locking function into a single component, reducing device complexity while maintaining reliable locking in chisel mode.
3Reliability
If additional components are added to lock the drill sleeve non-rotatably in chisel mode, then the locking function is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The sliding block's internal toothing is designed to serve dual purposes: transmitting rotational motion during hammer drill mode and providing locking engagement during chisel mode. This multi-functionality eliminates the need for separate locking components, resolving the contradiction between reliable locking and device simplicity.
Solution Approach 2:
The locking function is merged with the existing sliding block mechanism by integrating internal toothing into it. This combines the motion transmission function and locking function into a single component, reducing device complexity while maintaining reliable locking in chisel mode.
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 solution reduces manufacturing complexity and costs by using existing parts for locking, ensuring the drill sleeve is fixed in any rotational position without significant resistance, enhancing operational efficiency and reducing quality issues.
Implementation Method 1
Both the internal gearing and the external gearing are involute gearing
Data Source
Figure 1~2
Figure 3~4
AI summary
The tool has a drive train (2), an output train (6) comprising a drill sleeve (10), and an adjusting unit for adjusting drill hammer mode or chisel operating mode. The adjusting unit has a sliding block (32) that is moved on an external tooth (28) of the sleeve in a longitudinal direction of the sleeve over an internal tooth (30). The block and internal tooth stay in engagement with a component (34) i.e. retaining ring (38), in the chisel operating mode, so that the sleeve is arranged in a non-rotatable position. The component is fixed to a machine housing and made from plastic.