Fastener Driving Device Stop Pawls Nail Alignment

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Solution Overview

Problem

Conventional fastener driving devices face challenges in accurately driving nails for metal connectors due to misalignment issues, particularly when handling different sized nails, leading to increased tool costs and potential jamming.

Innovation Solution

A fastener driving device with a nose assembly and magazine system that includes stop pawls and movable nail stops to prevent nail misalignment, allowing for precise control and feeding of both long and short nails by positioning the stop pawls and nail stops strategically within the feed channel.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional pneumatic nailers are used to drive metal connector fasteners, then the device can drive nails, but the nails tend to recede into the magazine causing misalignment and tool jamming

Engineering Contradiction:

Improvenail alignment reliabilityVSAvoidnail feeding operation

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

A probe is introduced as an intermediary component between the nail magazine and the workpiece. The probe extends into the nail feed channel and physically prevents nails from receding into the magazine during operation, thereby eliminating misalignment and jamming issues while maintaining ease of use

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The probe is positioned in advance within the nail feed channel to preemptively stop nail recession before it can cause misalignment. This preliminary physical barrier ensures nails remain properly aligned with the driver throughout the driving operation

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the tip of the fastener is used as a hole locator, then the hole can be located, but the nail tends to slide back into the magazine causing misalignment

Engineering Contradiction:

Improvehole location precisionVSAvoidnail alignment precision

Core Design Contradiction:

Measurement precisionVSManufacturing precision

Solution Approach 1:

The probe serves as a mediator that separates the hole location function from the nail positioning function. The probe tip locates the hole while the probe body prevents nail recession, eliminating the conflict between these two functions that caused misalignment

Inventive Principle:

Principle #24Intermediary (Mediator)

3Ease of operation

If conventional contact arm design is used, then the trigger mechanism works, but the precise location of the fastener cannot be controlled

Engineering Contradiction:

Improvetrigger operationVSAvoidfastener location precision

Core Design Contradiction:

Ease of operationVSMeasurement precision

Solution Approach 1:

The device is segmented into distinct functional components: the contact arm for trigger operation and the probe for precise fastener location. This segmentation allows each component to perform its specific function optimally without interfering with the other

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20240408730A1Fastener driving device with mechanisms to limit movement of nails

Publication Date: 2024.12.12 STANLEY FASTENING SYSTEMS LP

AI summary

A fastener driving device includes a housing assembly, a nose assembly connected to the housing assembly, a magazine for carrying a supply of fasteners through a feed channel along a feed direction toward the nose assembly, and a plurality of stop pawls independently movable about a common pivot axis. Each stop pawl has a distal end extending into the feed channel.