Nail Guide Recess Radial Bulge Guidance

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Solution Overview

Problem

Existing nail fixing devices with internal combustion engines face a problem where the hollowed-out buffer guide structure, intended for nail ejection and expansion, causes the nail head to lose guidance just before impacting the support material, compromising the fixing process.

Innovation Solution

A buffer guide with a recess featuring a constriction matching the bore's passage section, utilizing radial bulges for continued guidance of the nail head and skirt until exit, ensuring proper alignment and fixing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the buffer guide is hollowed out to enable ejection and expansion of the guide skirt, then the nail can be properly ejected and expanded, but the nail head loses guidance just before impacting the support material

Engineering Contradiction:

Improvenail ejection and expansionVSAvoidnail guidance precision

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The buffer guide is segmented into two distinct functional zones: a hollowed-out recess for ejection/expansion and a constriction zone with reduced cross-section for guidance. This segmentation allows each zone to perform its specific function optimally without interfering with the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different sections of the buffer guide have different structural qualities - the recess area is hollowed out for expansion, while the constriction area has a reduced cross-section matching the nail head diameter to provide guidance. This local differentiation resolves the contradiction by providing the right structural property in the right location.

Inventive Principle:

Principle #3Local quality

2Productivity

If the buffer guide has a hollowed-out recess structure, then nail ejection and expansion is improved, but the nail head is no longer guided over the last portion of its travel

Engineering Contradiction:

Improvenail ejection efficiencyVSAvoidfixing reliability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The buffer guide structure is divided into a recess portion for ejection and a constriction portion for guidance, allowing both functions to coexist without compromise.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The constriction is positioned upstream in the nail's path, establishing guidance before the nail enters the hollowed-out recess area, ensuring the nail is properly aligned before ejection and expansion occurs.

Inventive Principle:

Principle #10Preliminary action

3Manufacturing precision

If the buffer guide maintains a constant bore section, then nail guidance is maintained throughout, but nail ejection and expansion becomes difficult

Engineering Contradiction:

Improvenail guidance consistencyVSAvoidnail ejection and expansion

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The buffer guide is segmented into a constant-section bore for guidance and a hollowed-out recess for ejection, with a constriction zone connecting them.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of maintaining a constant bore throughout, the design inverts the approach by creating a hollowed-out recess and compensating with a constriction zone, achieving both ejection capability and guidance maintenance through opposite structural modifications.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentEP2402120B1Guide for a nail-setting device and device including the guide

Publication Date: 2020.09.30 SOC DE PROSPECTION & DINVENTIONS TECHN SPIT

Figure 1
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Figure 5~6

AI summary

The plug guide (8) has a bore (13) for receiving a nail (9) comprising a head (11) and a shaft (12) onto which a skirt (14) is slid. A recess (15) is provided in the front part (30) of the plug guide for ejecting and expanding the guiding skirt. The recess comprises a radial bulge projecting inside, for extending the wall of the bore of the plug guide.