Blade Cover Retainment Structure for Deeper Rotary Blade Cutting
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Solution Overview
Problem
The size of the cover retainment mechanism in existing working machines increases in the radial direction of the cover rotation axis, limiting the maximum cutting depth of the rotary blade.
Innovation Solution
A cover retainment mechanism comprising a first member with an outer thread and a second member with an inner thread, allowing the output shaft to pass through, eliminating the need for separate screw members and holes, thereby downsizing the mechanism in the radial direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate screw members and holes are used to attach the blade cover, then the blade cover can be securely fastened, but the cover retainment mechanism size increases in the radial direction
Solution Approach 1:
The patent merges the screw member attachment function into the clamp members themselves by defining holes directly in the clamp members for receiving fastening bolts. This eliminates the need for separate screw members and reduces the radial size of the cover retainment mechanism while maintaining secure blade cover fastening.
Solution Approach 2:
The clamp members serve multiple functions: they clamp the blade cover, provide structural support, and include integrated holes for fastening. This multi-functionality reduces the number of separate components needed and minimizes the radial dimension of the overall mechanism.
2Device complexity
If the cover retainment mechanism size increases in the radial direction, then the mechanism can accommodate separate screw members, but the maximum cutting depth of the rotary blade becomes smaller
Solution Approach 1:
By integrating the fastening holes into the clamp members themselves, the patent eliminates the need for additional radial space that would be required for separate screw members. This reduction in radial dimension directly increases the maximum cutting depth of the rotary blade.
Solution Approach 2:
The patent extracts the fastening function from separate screw members and incorporates it directly into the clamp members through defined holes. This removal of redundant components reduces the radial size of the cover retainment mechanism and increases blade cutting depth.
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
This configuration increases the maximum cutting depth of the rotary blade by reducing the size of the cover retainment mechanism and minimizing interference with the output shaft.
Implementation Method 1
an outer thread defined in an outer circumferential surface of the first cylindrical portion, and a first cover support portion supporting the blade cover in a first direction which is along the cover rotation axis and a second member including a second cylindrical portion disposed radially outside the first cylindrical portion, an inner thread defined in an inner circumferential surface of the second cylindrical portion and onto which the outer thread is screwed
Data Source
AI summary
A working machine may include a rotary blade, an output shaft, a prime mover, a working machine body, a blade cover, and a cover retainment mechanism rotatably supporting the blade cover about a cover rotation axis. The cover retainment mechanism may include a first member including a first cylindrical portion enclosing the output shaft, an outer thread defined in an outer circumferential surface of the first cylindrical portion, and a first cover support portion supporting the blade cover in a first direction which is along the cover rotation axis and a second member including a second cylindrical portion disposed radially outside the first cylindrical portion, an inner thread defined in an inner circumferential surface of the second cylindrical portion and onto which the outer thread is screwed, and a second cover support portion supporting the blade cover in a second direction which is opposite to the first direction.