Offset Strip Fingers for Gap-Free Splinter Protection
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Solution Overview
Problem
Existing splinter protection devices for woodworking machines allow gaps between latch fingers, enabling large splinters to pass through and compromising protection against objects moving counter to the insertion direction.
Innovation Solution
Incorporating a flexible, tear-resistant strip mat with laterally offset strip fingers, which dissipates kinetic energy and maintains a multi-layer curtain effect to prevent uncontrolled movement and splinter escape, optionally combined with metal latch fingers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If latch fingers made of metal plates are used, then protection against objects moving counter to insertion direction is provided, but gaps arise between individual latch fingers when larger splinters are kicked back
Solution Approach 1:
The patent applies a flexible strip mat made of tear-resistant material that can deform and adapt to the movement of splinters. The strip mat includes multiple strip fingers that are laterally offset and can move relative to each other, creating a flexible barrier that closes gaps dynamically when splinters kick back, thereby eliminating the gap problem inherent in rigid metal latch fingers while maintaining protection reliability.
Solution Approach 2:
The strip fingers are designed to be movable relative to one another, allowing the structure to dynamically respond to the impact of kicked-back splinters. This dynamic behavior enables the strip mat to maintain continuous coverage and prevent gaps from forming, resolving the contradiction between providing protection and avoiding gaps.
2Reliability
If a flexible strip mat with movable strip fingers is used, then kinetic energy of kicked back objects is dissipated and gaps are prevented, but device complexity increases
Solution Approach 1:
The strip mat is segmented into multiple strip fingers that are laterally offset and can move independently. This segmentation allows each finger to respond individually to impacts while collectively forming a continuous barrier, achieving high reliability without requiring an overly complex overall structure. The segmented design simplifies the movement mechanism compared to a fully rigid or fully flexible single-piece structure.
Solution Approach 2:
The strip mat combines flexible tear-resistant material with a structured arrangement of strip fingers to create a composite protective element that achieves both flexibility and structural integrity. This composite approach allows the device to dissipate kinetic energy effectively while maintaining a relatively simple overall structure that does not require complex mechanisms.
3Reliability
If multiple layers of strip mat are used with increasing strip finger width, then protection level is enhanced, but manufacturing complexity and cost increase
Solution Approach 1:
The multi-layer strip mat is segmented into layers with progressively increasing strip finger width, where each layer is laterally offset from the others. This segmentation strategy allows for systematic manufacturing where each layer can be produced independently with standard widths, and the lateral offset pattern provides a clear assembly guide, reducing manufacturing complexity despite the multi-layer configuration.
Solution Approach 2:
Different layers of the strip mat have different strip finger widths, with wider fingers in outer layers providing enhanced protection at critical areas. This local quality variation optimizes protection levels where needed while maintaining simpler, narrower fingers in inner layers, balancing protection enhancement with manufacturing ease by avoiding uniform complexity across all layers.
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 strip mat configuration provides enhanced protection against objects moving counter to the insertion direction, ensuring reliable containment of splinters and preventing gaps, thus enhancing the overall protective efficacy of the splinter protection system.
Implementation Method 1
when these objects hit a large part of the kinetic energy of the objects is dissipated into the strip mat on the strip mat due to its flexibility and the strip fingers that can be moved relative to one another
Data Source
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AI summary
A splinter protection device for a woodworking machine has a stripmat (8) made of a flexible, tear-resistant material, with the stripmat (8) having at least two layers (39) with a number of strip fingers (42), and with the layers (39) adjoining to the strip fingers (42) being laterally offset against each other. Thereby an essentially gap-free and therefore operationally safe enclosure for a massive wood body (24) is attained, as well as a cover for dropped fingers.