Nail Driver Trigger Sheet Mechanism for Unintended Firing Prevention

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Solution Overview

Problem

In existing nail driver designs, ineffective trigger actuation leads to failure in restoring the stop to its contact position with the sliding rod, preventing successful re-triggering due to resistance from the sliding rod, resulting in unintended nail firing.

Innovation Solution

A protection device featuring a trigger device with a trigger sheet and ejecting rod, and a safety device with a sliding unit and unidirectional driving rod, where the trigger sheet elastically resists the ejecting rod to pivotally rotate and separate from the driving rod, preventing nail firing when actuated ineffectively and ensuring unhindered restoration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the trigger is pressed idly (ineffectively), then the stop separates from the sliding rod, but the sliding rod resists against the stop in reverse direction preventing successful restoration

Engineering Contradiction:

Improvetrigger actuation reliabilityVSAvoidtrigger restoration capability

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The trigger mechanism is segmented into separate functional components: the trigger sheet (22) for actuation, the ejecting rod (24) for force transmission, and the driving rod (33) for safety control. This segmentation allows each component to perform its specific function independently, preventing the restoration interference problem.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The ejecting rod (24) serves as an intermediary between the trigger sheet (22) and the driving rod (33). It transmits the actuating force while being elastically pivotally connected to the trigger sheet, allowing the trigger sheet to restore without direct resistance from the driving rod.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the sliding rod resists against the stop in reverse direction, then the stop cannot restore successfully, but this prevents unintended nail firing

Engineering Contradiction:

Improveunintended nail firing preventionVSAvoidtrigger re-actuation capability

Core Design Contradiction:

Object-affected harmful factorsVSEase of operation

Solution Approach 1:

The harmful reverse resistance force is extracted from the restoration path. The unidirectional confinement structure of the driving rod (33) allows it to constrain motion in one direction while permitting free restoration in the opposite direction, separating the safety function from the restoration function.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The driving rod (33) employs a unidirectional confinement mechanism that dynamically adapts its constraint properties. It provides resistance in the forward direction for safety control but allows free movement during restoration, changing its mechanical behavior based on the direction of motion.

Inventive Principle:

Principle #15Dynamics

3Reliability

If the trigger sheet is elastically pivotally connected to the trigger, then the trigger sheet can elastically resist against the ejecting rod, but this requires additional space in the trigger body

Engineering Contradiction:

Improveineffective actuation preventionVSAvoidtrigger body space

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The trigger sheet (22) is designed as a thin, flexible sheet-like component that provides the necessary elastic resistance and pivotal motion. This thin-film approach achieves the required mechanical functionality while occupying minimal space within the trigger body.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

Multiple functions are merged into the trigger sheet (22): it serves as both the actuating surface and the elastic restoring element. The sheet-like structure combines the functions of force application, elastic deformation, and pivotal motion in a single compact component.

Inventive Principle:

Principle #5Merging (Combining)

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

Prevents unintended nail firing by ensuring the trigger sheet separates from the driving rod, allowing for successful restoration and preventing re-triggering issues, thus maintaining effective operation.

Implementation Method 1

a lower end of the trigger sheet being elastically pivoted to an inner side of the trigger; thus, the trigger sheet elastically resisting against the ejecting rod

Methodology Applied

Scientific EffectElasticity: Elasticity

Data Source

PatentUS7530482B1Protection device of nail driver for preventing from triggering in ineffective actuation

Publication Date: 2009.05.12 APACH IND CO LTD

AI summary

A protection device of a nail driver for preventing from triggering in a state of ineffective actuation comprises a trigger device including a trigger, a trigger sheet, and an ejecting rod; the trigger being installed at an inner side of the body of the nail driver; a lower end of the trigger sheet being elastically pivoted to an inner side of the trigger; thus, the trigger sheet elastically resisting against the ejecting rod; therefore, when the trigger is pressed, the trigger sheet will drive the ejecting rod to pivotally rotate; a safety device including a sliding unit, and a driving rod; the sliding unit being slideably installed at a lower side of the body; one end of the sliding unit extending to a shooting head of the nail driver; the driving rod being elastically pivoted at another end of the sliding unit; the driving rod is a unidirectional confinement structure.