Multi-position Lock for Pruning Device Blades
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Solution Overview
Problem
Conventional pruning devices, such as hand pruners or secateurs, lack adjustable opening sizes, which can lead to user fatigue and inefficiency, as they do not accommodate varying hand sizes or item sizes effectively, and often fail to provide a secure locked position when not in use.
Innovation Solution
A multi-position locking mechanism that allows the pruner or secateur to be locked closed or adjusted to various opening degrees, utilizing a slide switch and anchor components to define multiple operational positions, enabling users to customize the opening based on hand size and task requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pruner or secateur is designed with a fixed opening size, then the structure is simple and easy to manufacture, but it cannot accommodate varying hand sizes or item sizes, leading to user fatigue and reduced efficiency
Solution Approach 1:
The patent applies the dynamics principle by transforming the fixed opening size into an adjustable one through a locking mechanism that allows the pruner to be set at multiple opening positions. The mechanism includes a movable locking component that can engage with different positions on the adjustment component, enabling dynamic adaptation to various hand sizes and pruning tasks while maintaining structural simplicity
Solution Approach 2:
The locking mechanism is segmented into distinct functional components: a locking component with engagement features, an adjustment component with multiple engagement positions, and a control component. This segmentation allows each part to perform its specific function independently, simplifying manufacturing while achieving the complex goal of multi-position adjustability
2Adaptability or versatility
If the pruner or secateur allows free opening during use, then the cutting blades can access larger items, but the blades may sustain damage or pose injury risk when not in use
Solution Approach 1:
The mechanism dynamically transitions between two states: during use, the pruner can open to the selected position for accessing items of various sizes; when not in use, the locking mechanism automatically secures the blades in a protected closed position, preventing damage and injury while maintaining the ability to open when needed
Solution Approach 2:
The locking mechanism incorporates a spring-loaded component that automatically returns the pruner to the locked closed position when released, providing self-service safety protection without requiring additional user action. The spring component stores and releases energy to ensure the blades are securely protected during storage
Data Source
AI summary
A multi-position lock for a pruner or secateur comprises a movable selector for selection between a locked condition for the blades of the pruner or secateur and one or more degree of opening positions for the blades. A typical example allows locked, maximum half open or maximum fully opened operation of the pruner or secateur.