Pneumatic Driver Guide With Separate Exhaust for Stable Piston Speed

Solution Overview

Problem

Existing driving tools face issues with maintaining appropriate air pressure in the driving cylinder and ensuring proper guide performance of the driver due to inadequate air discharge and uneven surfaces on the shaft hole or injection path, leading to increased load and reduced speed of the driving piston.

Innovation Solution

A driving tool design featuring a guide portion with a guide hole and an exhaust hole positioned outward from the inner peripheral surface, allowing air to be discharged effectively while maintaining air pressure and ensuring the driver's guidance is not hindered.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If the diameter of the shaft hole or injection path is increased to discharge air from the driving cylinder lower chamber, then air discharge is improved, but the interval between the driver and shaft hole increases, reducing guide performance

Engineering Contradiction:

Improveair discharge efficiencyVSAvoidguide performance

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The invention separates the air discharge function from the guide function by providing a dedicated exhaust hole in the guide portion, distinct from the guide hole. This segmentation allows the guide hole to maintain its original diameter for proper driver guidance while the exhaust hole handles air discharge, eliminating the need to increase the guide hole diameter.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The exhaust hole acts as an intermediary element that provides an additional air discharge path without interfering with the guide hole's function. By introducing this intermediate structure, the system achieves both improved air discharge and maintained guide performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If a portion protruding outward is formed on the inner peripheral surface of the shaft hole to discharge air, then air discharge is improved, but the uneven surface reduces guide performance

Engineering Contradiction:

Improveair discharge efficiencyVSAvoidguide performance

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The invention separates the air discharge function from the guide function by providing a dedicated exhaust hole in the guide portion, distinct from the guide hole. This segmentation allows the guide hole to maintain its original diameter for proper driver guidance while the exhaust hole handles air discharge, eliminating the need to increase the guide hole diameter.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The exhaust hole acts as an intermediary element that provides an additional air discharge path without interfering with the guide hole's function. By introducing this intermediate structure, the system achieves both improved air discharge and maintained guide performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Speed

If the air pressure in the driving cylinder lower chamber is not appropriately controlled, then the driving piston speed decreases due to increased load, but controlling air pressure requires additional complexity

Engineering Contradiction:

Improvedriving piston speedVSAvoidair pressure control system

Core Design Contradiction:

SpeedVSDevice complexity

Solution Approach 1:

The exhaust hole provides automatic air discharge from the driving cylinder lower chamber based on pressure differential. When air pressure builds up, air naturally flows out through the exhaust hole without requiring active control mechanisms, valves, or sensors, thus maintaining driving piston speed while avoiding system complexity.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The invention extracts the air discharge function from the main guide hole by providing a separate exhaust hole. This extraction allows air to be removed from the driving cylinder lower chamber independently, preventing pressure buildup that would reduce driving piston speed, while the guide hole continues its guidance function.

Inventive Principle:

Principle #2Taking out (Extraction)

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

The solution maintains appropriate air pressure and guide performance, preventing increased load on the driving piston and ensuring smooth operation of the driver, thereby enhancing the driving tool's efficiency and accuracy.

Implementation Method 1

The exhaust hole allows an inside of the driving cylinder to communicate with an outside of the driving tool... air pressure in the driving cylinder can be appropriately maintained

Methodology Applied

Scientific EffectPressure gradient: Pressure Gradient

Implementation Method 2

air pressure of the compressed air is applied to an upper surface of a driving piston, so that the driving piston moves in a downward direction

Methodology Applied

Scientific EffectAir pressure: Pressure Increase

Data Source

PatentUS12539582B2Driving tool

Publication Date: 2026.02.03 MAX CO LTD

AI summary

There is provided a driving tool driven by air pressure of compressed air. The driving tool includes: a driving cylinder to which compressed air is supplied; a driving piston configured to move in an up-down direction inside the driving cylinder by the supplied compressed air; a driver attached to the driving piston and configured to move in the up-down direction; and a guide portion provided on a lower side of the driving cylinder. The guide portion has a guide hole through which the driver passes and an exhaust hole that allows an inside of the driving cylinder to communicate with an outside of the driving tool. The exhaust hole is provided at a position separated outward from an inner peripheral surface of the guide hole.