Crescent Rocker Arm Cutting Plate Overlap for Heavy Lumber
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Solution Overview
Problem
Conventional cutting devices for trees are limited in cutting thicker trunks due to the restricted receiving space, which is determined by the radius of the sickle-shaped rocker, and increasing the rocker's size enhances weight and manipulation effort.
Innovation Solution
A crescent-shaped abutment with a counter-cutting plate and a toothed abutment edge parallel to the cutting edge, allowing the tree trunk to be cut on the side of the abutment and preventing deviation, while the overlapping cutting edges prevent bending and facilitate resharpening without impairing the cut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the rocker and abutment are made larger to cut thicker tree trunks, then the cutting capacity is improved, but the weight and manipulation effort increase
Solution Approach 1:
The invention introduces a counter-cutting plate that extends in the direction perpendicular to the cutting plate, creating a third dimension for cutting. This allows the tree trunk to be cut from both sides simultaneously, effectively increasing the cutting capacity without requiring the rocker to be larger in its primary dimensions.
Solution Approach 2:
The cutting action is divided into two separate cutting edges: the cutting plate on the rocker and the counter-cutting plate on the abutment. Each cutting plate handles one side of the trunk, allowing the system to process thicker trunks without increasing the overall size of the rocker mechanism.
2Volume of stationary object
If the rocker size is increased to accommodate thicker trunks, then the receiving space is improved, but the device complexity increases
Solution Approach 1:
The counter-cutting plate extends beyond the cutting plate in the direction perpendicular to the cutting edge, utilizing unused space in the receiving area. This effectively increases the receiving space capacity without requiring the rocker to be larger, thereby avoiding increased device complexity.
3Manufacturing precision
If the cutting plate and counter-cutting plate are designed to collide for clean cuts, then the cutting quality is improved, but the reliability decreases due to bending under heavy loads
Solution Approach 1:
The cutting plates are designed to overlap rather than just touch or collide. This excessive action ensures that even if the plates bend under heavy loads, the overlapping area maintains sufficient contact to complete the cut. The overlap provides a margin of error that compensates for deformation under load.
Solution Approach 2:
The overlapping design of the cutting plates anticipates potential bending under heavy loads by providing extra contact area before the bending occurs. This pre-built tolerance ensures that the cutting edges remain effective even when subjected to unexpected stress during operation.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
A device for cutting heavy material, in particular trees, comprising a base part (2) and a rocker arm (1) pivotably arranged relative to the base part (2) from an open position to a closed position, the rocker arm being crescent-shaped and carrying a cutting plate (5), wherein the rocker arm (1) is spaced apart from a support (7) of the base part (2) in its open position, and in its closed position, together with the support (7) of the base part (2), defines a receiving space (11) for cut material, which is traversed by the cutting plate (5), wherein the support (7) projects crescent-shaped from the base part (2) and has a counter-cutting plate (6) traversing the receiving space (11). According to the invention, the counter-cutting plate (6) of the support (7) and the cutting plate (5) of the rocker arm (1) overlap in their closed position.By means of the measures provided according to the invention, the receiving space (11) of the cutting unit is enlarged, so that now larger tree trunks can also be cut without having to enlarge the swing arm (1).