Reaming Screw Structure for Fast Wood Chip Removal and Stable Locking

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Solution Overview

Problem

Conventional wood screws face difficulties in effectively removing wood chips during tapping and locking, leading to uneven stress distribution, unstable joints, and increased risk of workpiece cracking due to their irregular patterns and lack of chip removal structures.

Innovation Solution

A fast chip removal reaming screw design featuring a screw head with a rod body and helically staggered reaming blocks and paths of varying widths, allowing for efficient chip removal and even stress dispersion, along with a taper thread for stable locking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a conventional wood screw with irregular pattern is used, then the screw can be locked into the wood, but the wood chips cannot be effectively removed and accumulate between the pattern part and the workpiece, causing increased pressure and workpiece cracking

Engineering Contradiction:

Improvescrew structure simplicityVSAvoidwood chip accumulation

Core Design Contradiction:

Ease of manufactureVSObject-generated harmful factors

Solution Approach 1:

The screw structure is segmented into distinct functional zones: the pattern part for locking, the reaming part with reaming blocks for chip removal, and the thread part for engagement. This segmentation allows each part to perform its specific function effectively without interference from chip accumulation in the pattern area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The chip removal function is extracted as a separate reaming part with reaming blocks positioned between the pattern part and thread part. This extracted chip removal mechanism actively removes wood chips from the cutting area, preventing their accumulation and the resulting pressure buildup that causes workpiece cracking.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If a conventional wood screw with pattern is used, then the screw can lock into the wood, but the engage force between pattern part and workpiece is uneven, resulting in unstable joint and shaking

Engineering Contradiction:

Improvejoint stabilityVSAvoidengage force uniformity

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

Different parts of the screw are given different local qualities: the pattern part has irregular protrusions for initial locking, the reaming part has reaming blocks for even material removal and stabilization, and the thread part has standardized threads for secure engagement. This local differentiation ensures even force distribution and stable joint formation.

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If multiple manufacturing processes are used to dispose threads at intervals, then the screw can be manufactured, but it causes higher cost and waste of time

Engineering Contradiction:

Improvemanufacturing process complexityVSAvoidmanufacturing time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The pattern part, reaming part, and thread part are merged into a single integrated screw body that can be manufactured in one continuous process. The threads are disposed continuously along the rod body from the neck portion through the reaming portion to the pointed cone portion, eliminating the need for multiple separate manufacturing steps and reducing both cost and time.

Inventive Principle:

Principle #5Merging (Combining)

4Strength

If a wood screw is used on wood with higher hardness, then the screw can lock into the wood, but it requires more labor and the screwing torque is increased, making it difficult to lock effortlessly

Engineering Contradiction:

Improvelocking capability on hard woodVSAvoidscrewing effort

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

The reaming part with reaming blocks performs preliminary action by removing wood chips and creating a cleaner path before the threads engage the wood. This preliminary chip removal reduces resistance during the screwing process, lowering the required screwing torque and making it easier to lock into hard wood.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The reaming blocks convert the harmful effect of wood chip accumulation into a beneficial chip removal mechanism. By actively removing chips that would otherwise increase pressure and resistance, the reaming part reduces the screwing effort required while maintaining strong locking capability on hard wood.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Data Source

PatentUS11713779B2Fast chip removal reaming screw

Publication Date: 2023.08.01 BI MIRTH CORP

AI summary

The present invention provides a fast chip removal reaming screw, including a screw head, a rod body extending from the screw head and a first thread arranged on the rod body. The rod body includes a rod body portion connected to the screw head, an reaming portion, and a pointed cone portion. The reaming portion includes first reaming blocks, second reaming blocks and third reaming blocks which are disposed in a helically staggered manner, and chip removal paths formed between the first reaming blocks, the second reaming blocks and the third reaming blocks. A first width of the chip removal path located between the first reaming blocks and a second width of the chip removal path located between the second reaming blocks are different, so that wood chips can be fast removed to reduce a stress between the screw and a wood workpiece.