Geared Pruner Mechanism With Adjustable Handle Span
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Solution Overview
Problem
Conventional pruners are inefficient in operation, difficult to use for larger branches, and lack versatility due to fixed handle span and unnatural rotating handle designs, limiting their use to right-handed users.
Innovation Solution
A pruner with a geared mechanism and variable gate opening button that allows adjustment of the handle span, featuring a geared mechanism to amplify force and a button to alter the handle distance, ensuring efficient cutting and user comfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a conventional pruner uses a simple pivot connection, then the structure is simple, but the cutting force is insufficient for larger branches
Solution Approach 1:
A geared mechanism is introduced as an intermediary between the handles and blades. The gears amplify the cutting force by providing mechanical advantage, allowing the user to cut larger branches with less effort. The gear system acts as a mediator that transforms the user's input force into amplified cutting force at the blades.
Solution Approach 2:
The pruner incorporates a movable pivot point that can be adjusted along the blade length. This dynamic adjustment allows the user to optimize the cutting position for different branch sizes and types. The pivot point can be repositioned to change the lever arm length, thereby adjusting the mechanical advantage and cutting force distribution.
2Adaptability or versatility
If the handle span is fixed, then the structure is simple, but the pruner cannot accommodate users with different hand sizes
Solution Approach 1:
The handle span is made adjustable through a telescopic mechanism that allows the distance between handles to be changed. Users can extend or retract the handle length to match their hand size and comfort preferences. This dynamic adjustment capability enables the same pruner to be used by users with different hand dimensions.
Solution Approach 2:
The handle assembly is divided into segmented sections that can be independently adjusted. The telescopic handle consists of multiple segments that can slide relative to each other, allowing incremental adjustment of the overall handle length. This segmentation enables fine-tuning of the handle span to suit individual user needs.
3Productivity
If a rotating handle design is used, then the cutting action can be continuous, but the operation feels unnatural and is only suitable for right-handed users
Solution Approach 1:
Instead of rotating the handles, the blades are designed to rotate relative to the handles during cutting. This inverted approach maintains the familiar linear squeezing motion that users are accustomed to, while still achieving continuous cutting action through the blade rotation. The cutting edge rotates through the material, providing efficient cutting without the unnatural handle rotation.
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
The pruner provides efficient cutting of both small and large branches with enhanced user comfort and versatility, accommodating various hand sizes through adjustable handle span and familiar handle movement.
Implementation Method 1
The second blade 21 of the moveable unit 20 is driven by the second handle 35 of the driving unit 30 through the engagement of the second transmission gear 34 and the first transmission gear 14 to pivotally move toward the first blade 11
Implementation Method 2
The pruner 1 further comprises a leaf spring 50 between the first unit 10 and the second unit 20 that acts upon the second unit 20 to move the second handle 35 away from the first handle 15 after the cut
Data Source
AI summary
A pruner includes a stationary unit, a movable unit, and a driving unit, wherein the stationary unit is pivotally connected to the movable unit, and the movable unit is pivotally connected to the driving unit. The pruner is operated by a geared mechanism wherein movement of a second handle on the driving unit drives movement of a second blade on the movable unit towards a first blade on the stationary unit through engagement of a second transmission gear on the driving unit with a first transmission gear on the stationary unit. The pruner further includes a first sliding groove on the stationary unit, a second sliding groove on the movable unit, and a variable gate opening button penetrating the sliding grooves. The configuration allows for adjustment of the span between the handles by setting the variable gate opening button at different positions of the first sliding groove.