Shear Attachment Gripping Teeth for Dense Object Cutting
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Solution Overview
Problem
Existing shear attachments for motorized vehicles, such as front-end loaders, struggle to securely cut dense or hardened objects as they tend to push these objects away due to inadequate gripping mechanisms, leading to inefficiencies and potential system failures or operator safety risks.
Innovation Solution
A shear attachment with a pivotally connected upper and lower jaw, featuring gripping teeth on the lower jaw and a universal hitch for versatile mounting, allows for secure cutting of objects at various angles using a single actuator, ensuring the shear and vehicle remain stationary during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a pivoting shear attachment is used to cut dense or hardened objects, then the shear can engage the object with cutting pressure, but the object is pushed out of the jaws and ejected uncut
Solution Approach 1:
Gripping teeth are introduced as an intermediary element between the jaw and the object being cut. These teeth extend into the object to provide mechanical interlocking, preventing the object from being pushed out during cutting operations.
Solution Approach 2:
The gripping teeth are positioned specifically at the forward end portion of the lower jaw, creating a localized gripping zone. This allows the shear to maintain different functions at different locations: cutting at the interface between jaws and gripping at the forward end of the lower jaw.
2Force
If the shear attachment pushes against dense objects to maintain cutting pressure, then cutting force is applied, but the shear and vehicle are pushed away from the tree
Solution Approach 1:
The gripping teeth serve as a mediator that transfers cutting forces directly to the object through mechanical interlocking, rather than relying on the entire jaw surface to push against the object. This reduces the reactive force that pushes the vehicle away.
Solution Approach 2:
The cutting force application is segmented into two components: gripping force applied by the teeth at the forward end, and cutting force applied by the jaw interface. This segmentation allows the vehicle to remain more stable while cutting.
3Adaptability or versatility
If the jaws are fixed in vertical orientation for delimbing, then the shear can receive branches between cutting jaw and anvil, but the shear is nearly useless for felling or sectioning trees
Solution Approach 1:
The lower jaw is made dynamically adjustable in orientation rather than fixed. It can be positioned at various angles relative to the upper jaw, allowing the shear to adapt to different cutting operations such as delimbing, felling, and sectioning without requiring multiple specialized devices.
4Reliability
If hydraulic clamping systems are added to overcome shear forces, then cutting stability is improved, but device complexity and cost increase
Solution Approach 1:
The complex hydraulic clamping system is extracted and replaced with a simpler mechanical gripping mechanism using teeth. This maintains the essential function of preventing object ejection while significantly reducing system complexity and cost.
Solution Approach 2:
The gripping teeth provide self-service gripping through their geometric shape and positioning. As the lower jaw engages the object, the teeth automatically insert into and grip the object without requiring additional actuators or control systems.
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 shear attachment effectively secures and cuts objects of different materials and sizes, directing power towards cutting rather than maintaining position, enhancing operational efficiency and safety by preventing the shear and vehicle from being pushed away during cutting.
Implementation Method 1
a plurality of teeth extend upwardly from the upper edge of the lower receiving jaw to grip an object while it is being cut between the upper and lower jaws
Data Source
AI summary
A shear attachment is presented for use with different types of motorized vehicles and is generally provided with an upper cutting jaw, a lower receiving jaw and a plurality of teeth along the upper surface of the lower jaw to grip an object while it is being cut between the upper and lower jaws. A single actuator may be used to move the cutting jaw between open and closed positions. The shear may be pivoted about a horizontal axis with respect to its mounting bracket to facilitate cutting at different angles. The shear is removably coupled to the vehicle using a universal hitch. The efficient design of the shear makes it durable, inexpensive to manufacture and easy to operate.