Offset Nail Two-Step Support Gusset Design
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Solution Overview
Problem
Offset nails with full or partially round heads face challenges in maximizing the number of nails per strip while maintaining strength and preventing bending or breakage under force, as existing designs require additional material and are prone to deformation due to unsupported head configurations.
Innovation Solution
The introduction of a two-step support gusset, comprising a conical and tear-shaped gusset, provides additional strength and load distribution between the head and shank, allowing for a thinner head design without compromising strength, and is manufactured using a cold rolling process or single blow nail heading machine.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If offset nails are designed with full-round heads and closer pitch spacing to maximize nails per strip, then productivity increases, but the nails are prone to bending and breakage due to unsupported head configurations
Solution Approach 1:
The head is segmented into two functional zones: a supported portion directly over the shank that provides structural strength, and an unsupported portion (toe) that provides clamping force. This segmentation allows the nail to achieve both high reliability in the supported zone and high productivity through closer spacing enabled by the compact overall profile.
Solution Approach 2:
Different regions of the head have different properties: the supported portion has full thickness for strength, while the toe portion is thinner for compactness. This local quality variation allows the nail to maximize nails per strip while maintaining reliability where structurally necessary.
2Loss of substance
If offset nails are designed with thinner heads to reduce material usage, then material efficiency improves, but the heads become susceptible to bending under driving forces
Solution Approach 1:
The head is divided into a thick supported portion and a thinner toe portion. The supported portion maintains full thickness to resist bending under driving forces, while the toe portion uses reduced material. This segmentation resolves the contradiction between material efficiency and bending resistance.
Solution Approach 2:
The head thickness varies locally: thick where structural strength is needed (over the shank) and thin where compactness is beneficial (the toe). This local quality approach minimizes overall material usage while preserving essential strength characteristics.
3Productivity
If offset nails are designed with fully off-center shanks to maximize spacing efficiency, then the number of nails per strip increases, but the junction between head and shank becomes weak and prone to breakage
Solution Approach 1:
The shank is positioned asymmetrically within the head, creating an offset configuration that improves spacing efficiency. The asymmetry is optimized to achieve maximum nails per strip while maintaining sufficient material at the head-shank junction to prevent breakage during driving.
Solution Approach 2:
The head-shank junction area maintains adequate material thickness and structural continuity despite the offset configuration. This local quality preservation ensures the junction remains strong enough to withstand driving forces while the overall offset design enables closer nail spacing.
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
This configuration enables closer nail spacing in strips, reduces material usage, and enhances the nail's ability to withstand forces without bending or breaking, while maintaining the integrity of the head and shank junction, thus improving the efficiency and reliability of nail strips in power tools.
Implementation Method 1
In another embodiment, the offset nail is formed with a round head and a support gusset beneath it using a cold rolling process.
Implementation Method 2
The support gusset provides added strength to the junction of the head and shank and distributes load from the head through the longitudinal axis of the shank.
Data Source
Figure 1
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AI summary
A nail (10) having an offset head (12) is configured with a multi-step support gusset (18, 518) formed integrally between an undersurface (24, 524) of the offset head and a superior portion of a shank (14). The head of the nail is relatively thin, and the shank is positioned radially off center of the head. A first portion of the gusset defines an angle relative to the shank axis and the second portion of the gusset defines an angle relative to the shank axis different from that of the first portion. The support gusset reinforces the junction of the shank with the head, supports a toe (16) of the head, and distributes the force of a load on the head through a longitudinal axis of the shank, preventing the toe from bending or yielding and prevents the shank from yielding to the stresses of the load applied.