Countersunk Fastener with Cutting Blocks for Debris Management
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Solution Overview
Problem
Conventional countersunk fasteners face issues with burrs and bulges during screwing, leading to uneven surfaces and potential breakages due to inadequate debris management and engaging force.
Innovation Solution
The fastener features blocks on its bottom surface with an accommodating area between them, including a first and second wall with a cutting edge, allowing for rapid cutting and debris containment, enhancing the engaging force and surface smoothness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional cutting edges are used, then the fastener can cut the object, but cutting debris protrudes out causing uneven surfaces and potential breakages
Solution Approach 1:
The patent converts the harmful cutting debris into a contained element by designing accommodating areas with retaining walls. The debris that would normally protrude and cause surface unevenness is now trapped within the accommodating areas formed by blocks and retaining walls, transforming a harmful factor into a managed byproduct of the cutting process
Solution Approach 2:
The retaining walls act as intermediary structures between the cutting edges and the external environment. These walls intercept and contain the cutting debris before it can protrude from the object surface, serving as a mediator that prevents the harmful effect of debris exposure while allowing the cutting function to proceed
2Force
If the fastener screws into the object, then engaging force is achieved, but the screwing process is slow and surface flatness is compromised
Solution Approach 1:
The head of the fastener is segmented into multiple blocks with cutting edges and accommodating areas. This segmentation allows simultaneous cutting and debris containment functions to be performed during the screwing process, improving both speed and surface quality while maintaining engaging force
Solution Approach 2:
The accommodating areas with retaining walls are pre-formed on the head surface before the fastening operation. This preliminary preparation enables immediate debris containment from the start of screwing, eliminating the need for subsequent surface finishing operations and improving overall productivity
3Manufacturing precision
If cutting edges restrain burrs and bulges, then surface flatness is improved, but the accommodating area capacity is insufficient for debris management
Solution Approach 1:
The patent adds a vertical dimension to debris containment by incorporating retaining walls that rise from the accommodating areas. This transforms the containment from a simple 2D surface feature into a 3D volumetric structure, significantly increasing the capacity to hold cutting debris while maintaining the surface flatness benefit
Data Source
AI summary
A fastener capable of speedily screwing provides a plurality of blocks on a bottom surface of a head and an accommodating area formed between any two adjacent blocks. Each block includes a first wall arranged at one side of the accommodating area and extended upward from the bottom surface, a second wall extending from the first wall to the other side of another adjacent accommodating area, and a cutting edge formed at a convergence of the first wall and the second wall. In screwing, the blocks assist in cutting to achieve a speedy screwing effect, and the accommodating area allows the cutting debris generated accordingly to be received therein to remain a firm engaging force between the fastener and an object. Further, there is no extra cutting debris protruding out of the object after screwing, which increases the flatness, and also enhances the screwing force of the fastener.