Rotatable Garden Tool Switch Mechanism With Spherical Rope Contact
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Solution Overview
Problem
Existing garden tools, such as lawn mowers, have stationary operating control mechanisms that fail to accommodate different user operation habits and heights, leading to user fatigue and a lack of humanization.
Innovation Solution
A switch control mechanism with rotatable handles connected to driving levers via pull ropes with spherical contact surfaces, allowing 360-degree rotation and ensuring the machine can be switched on or off regardless of handle position, featuring a control button with a tongue part and rollers to reduce friction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the operating control mechanism has a fixed position, then the structure is simple and stable, but it cannot accommodate different user heights and operation habits, leading to user fatigue
Solution Approach 1:
The handle is designed to be rotatable around a rotational axis, transforming the static fixed-position control mechanism into a dynamic adjustable one. This allows the handle to change its position according to different user heights and operation habits, resolving the contradiction between adaptability and structural simplicity by introducing controlled movement rather than complete complexity
Solution Approach 2:
The control mechanism is divided into separable components: the handle that can rotate, the driving lever, the pull rope, and the switch. This segmentation allows the handle to be independently positioned while maintaining connection to the switching mechanism, enabling adaptability without proportionally increasing overall system complexity
2Ease of operation
If the handle position is changed to meet different user needs, then user comfort improves, but ensuring reliable switch control at any handle position becomes challenging
Solution Approach 1:
The contact surface between the pull rope and trigger is designed as a spherical surface with the center on the rotational axis of the handle. This spherical geometry ensures that the pull rope always contacts the trigger at the correct point regardless of the handle's rotational position, maintaining reliable switch control while allowing full rotational freedom for user comfort
Solution Approach 2:
The pull rope acts as an intermediary element that transmits the triggering force from the handle to the driving lever and switch. Combined with the spherical contact surface, this intermediary mechanism ensures that the force transmission remains reliable and consistent across all handle positions, decoupling the rotational freedom from the switching reliability
3Adaptability or versatility
If the handle can rotate 360 degrees to accommodate all operation habits, then versatility improves, but the mechanism complexity and potential failure points increase
Solution Approach 1:
The mechanism uses simple rotational dynamics with the handle rotating around a fixed axis, avoiding complex multi-axis or articulated mechanisms. This dynamic rotation capability provides 360-degree versatility while maintaining relative structural simplicity through the use of basic rotational joints and flexible pull ropes
Solution Approach 2:
The pull rope acts as a flexible element that can accommodate the handle's 360-degree rotation without requiring rigid mechanical linkages. This flexibility allows the control mechanism to achieve full rotational versatility while minimizing structural complexity, as the rope naturally adapts to any handle position without additional joints or components
Data Source
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AI summary
Disclosed is a switch control mechanism for a garden tool, the mechanism comprising handles (12), a switch and shift rods (8). Triggers (6) are arranged on the handles, and the handles can rotate around the axes thereof. The triggers are connected to the shift rods by pull ropes (5), and the contact faces between the pull ropes and the triggers are spherical faces. The handles of the switch control mechanism for the garden tool can rotate within 360 degrees, so as to satisfy different operators, and can ensure that a user can control the switch of a machine wherever the handles are placed.