Serviceable Pivot for Demolition Shears
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Solution Overview
Problem
Conventional demolition shears lack a serviceable pivot mechanism that allows for easy replacement and maintenance of pivot components, leading to inefficiencies and reduced versatility in cutting operations.
Innovation Solution
A demolition shears design featuring a removable stop assembly with main bearings, end caps, and thrust washers that rotationally support the main shaft, enabling it to pivot with the movable jaw without axial fixation, allowing for easy disassembly and replacement of the main shaft and jaws.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pivot components are fixed and integrated into the shears body, then the structural strength and stability are improved, but the ease of repair and maintenance deteriorates
Solution Approach 1:
The pivot assembly is segmented into separate components: the main shaft, removable stop assembly, bearings, and thrust washers. This segmentation allows individual components to be replaced independently without replacing the entire pivot assembly, resolving the contradiction between structural stability and ease of repair.
Solution Approach 2:
The removable stop assembly is extracted as a separate, easily removable component that secures the main shaft during operation but can be quickly removed for maintenance. This extraction allows the main shaft to be accessed and replaced without disassembling the entire shears structure, maintaining structural integrity while enabling easy repair.
2Stability of the object's composition
If the main shaft is axially fixed to the movable jaw, then the rotational stability is improved, but the ease of operation for maintenance deteriorates
Solution Approach 1:
The connection between the main shaft and movable jaw is made dynamic rather than static. The removable stop assembly provides axial fixation during operation but can be quickly removed to allow shaft extraction. This dynamic connection resolves the contradiction between rotational stability during use and ease of operation during maintenance.
Solution Approach 2:
The removable stop assembly acts as an intermediary component between the main shaft and movable jaw. It provides the necessary axial constraint for stable rotation during operation but can be easily removed to allow shaft replacement, thus mediating between the requirements for stability and ease of maintenance.
3Ease of manufacture
If conventional fixed pivot mechanisms are used, then the manufacturing simplicity is maintained, but the adaptability for different jaw configurations deteriorates
Solution Approach 1:
The pivot assembly with removable stop mechanism is designed as a universal interface that can accommodate different movable jaw configurations. The standardized main shaft and stop assembly can work with various jaw types, providing multi-functionality that resolves the contradiction between manufacturing simplicity and adaptability.
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
Facilitates easy maintenance and replacement of pivot components, enhancing the versatility and efficiency of the shears by allowing the use of different upper jaws, reducing downtime and improving cutting performance.
Implementation Method 1
a pair of main bearings for rotationally supporting the main shaft
Implementation Method 2
a pair of outer thrust washers
Data Source
AI summary
This invention relates to a demolitions shears, including a body having a fixed jaw and a movable jaw that pivots with respect to the fixed jaw. A main shaft for pivotally mounting the moveable jaw to the body. A hydraulic cylinder for actuating the movable jaw to pivot. The movable jaw includes a first rotation stop and the main shaft including a second rotation stop. When the main shaft is installed in the moveable jaw, the first rotation stop and the second rotation stop are coupled to prevent relative rotation between the main shaft and the movable jaw, without axially fixing the main shaft to the movable jaw. A removable stop assembly is constructed and arranged to limit axial movement between the main shaft and the movable jaw.