Hand-held Power Tool Switch Actuation Mechanism
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Solution Overview
Problem
Hand-held power tools with traditional rod assemblies for actuating switch elements are prone to malfunctions due to limited ruggedness and require significant space, increasing forces on the switch element and necessitating a large tool size.
Innovation Solution
A compact hand-held power tool design featuring an actuating element with a receiving element that accommodates the switch element, allowing for a shorter overall height and length, and a slider mechanism with rib-like protrusions for secure connection, eliminating the need for complex transmission elements and enabling safe, reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rod assembly is used to connect the actuating element to the switch element, then the switch element can be actuated, but the device becomes complex and requires significant space
Solution Approach 1:
The invention extracts and eliminates the rod assembly transmission element from the system. The switch element is positioned directly in the receiving element of the actuating element, removing the need for intermediate transmission components while maintaining the actuation function.
Solution Approach 2:
The switch element is merged with the actuating element by placing it directly in the receiving element. This integration eliminates the need for separate transmission elements and reduces the overall device complexity.
2Ease of operation
If a rod assembly with levers is used for actuation, then the switch element can be switched, but the forces on the switch element increase
Solution Approach 1:
The invention removes the lever mechanism from the transmission path. By placing the switch element directly in the receiving element, the force transmission is simplified and the excessive forces that would be amplified by levers are eliminated.
3Ease of operation
If a rod assembly is used for mechanical transmission, then the actuating element can be connected to the switch element, but the tool size increases
Solution Approach 1:
The rod assembly is extracted from the design, eliminating the space it would occupy. The direct placement of the switch element in the receiving element significantly reduces the overall tool dimensions.
Solution Approach 2:
The switch element is nested within the receiving element of the actuating element. This compact arrangement allows the components to occupy minimal space while maintaining full functionality.
4Ease of operation
If a rod assembly is used for transmission, then the actuating element can be connected to the switch element, but the ruggedness is limited and malfunctions occur
Solution Approach 1:
The rod assembly, which is prone to malfunction, is completely removed from the system. The direct connection between the actuating element and switch element eliminates the transmission path that causes reliability issues.
Solution Approach 2:
Instead of using a complex transmission mechanism to connect the actuating element to the switch element, the invention inverts the approach by placing the switch element directly within the actuating element's receiving element, eliminating the need for intermediate components.
Data Source
AI summary
In a hand-held power tool with a device for presetting a selected rotation direction of a drive motor that is associated with the power tool and contained in a tool housing. The device is equipped with an actuating element accessible from outside the tool housing for mechanically actuating a switch element, which is situated inside the tool housing and is at least embodied for electrically switching between a first and second rotation direction of the drive motor, the switch element is situated in the vicinity of the actuating element.