V-Shaped Annular Seal for Pneumatic Fastener Tool
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional pneumatically operable fastener-driving tools require multiple seal mechanisms, which lead to increased size, weight, and reduced portability, and existing single-seal solutions fail to maintain effective sealing during both high and low-pressure operational cycles.
Innovation Solution
A pneumatically operable fastener-driving tool utilizing a single annular seal member with a V-shaped cross-sectional configuration, where the radially outwardly flared portion faces the high-pressure upstream end and the closed region is integrated towards the low-pressure downstream end, ensuring effective sealing during both fastener-driving and return strokes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple seal mechanisms are used in conventional pneumatically operable fastener-driving tools, then sealing reliability is improved, but device complexity and weight increase
Solution Approach 1:
The patent combines multiple seal mechanisms into a single integrated seal member with a specific geometric configuration. The seal member includes a body portion and a lip portion that works against the cylinder wall, eliminating the need for separate seal components while maintaining sealing effectiveness during both forward and return strokes of the piston.
Solution Approach 2:
The single seal member is designed to perform multiple sealing functions simultaneously. It seals during the forward stroke when high pressure acts on one side and during the return stroke when pressure conditions reverse, making it a multi-functional component that replaces what would traditionally require multiple specialized seals.
2Reliability
If dual seal mechanisms are used, then sealing during both high and low-pressure cycles is improved, but axial length and portability deteriorate
Solution Approach 1:
The patent merges what would traditionally be two separate seal mechanisms into one compact seal member mounted on the piston. This integration dramatically reduces the axial space required while ensuring sealing functionality is maintained throughout the complete pressure cycle from high-pressure forward stroke to low-pressure return stroke.
3Reliability
If O-ring type seal members are used, then sealing function is achieved, but service life is reduced due to constant biasing wear
Solution Approach 1:
The seal member is designed with dynamic characteristics where the lip portion can flex and adapt to pressure changes. During the forward stroke, high pressure forces the lip against the cylinder wall for sealing. During the return stroke, pressure equalization allows the lip to relax, reducing wear. This dynamic response to varying pressure conditions extends service life compared to constantly biased O-rings.
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 single V-shaped annular seal member extends service life and maintains sealing functionality, reducing the tool's axial length, weight, and enhancing portability by eliminating the need for dual seal mechanisms.
Implementation Method 1
the open region or radially outwardly flared portion of the V-shaped annular seal member is disposed toward the high-pressure upstream end portion of the pneumatic tool cylinder... while, conversely, the closed region of the V-shaped annular seal member... is disposed toward the low-pressure downstream end portion
Data Source
AI summary
A pneumatically operable fastener-driving tool and seal mechanism assembly, and a method of operating the same, comprises the use of a single, annular seal member, having a substantially V-shaped cross-sectional configuration, disposed within an annularly recessed portion of the fastener-driving tool piston in such a manner that the open region of the V-shaped annular seal member is disposed toward the relatively high-pressure upstream end portion of the fastener-driving tool cylinder, while, conversely, the closed region of the V-shaped annular seal member is disposed toward the relatively low-pressure downstream end portion of the pneumatic tool cylinder Accordingly, the relatively high-pressure air acts upon the radially outwardly flared lip portion of the annular seal member during a power stroke, while relatively low-pressure air acts upon the radially outwardly flared lip portion of the annular seal member during a return stroke, whereby only a single V-shaped annular seal member is required to achieve proper sealing performance characteristics throughout an operative cycle of the fastener-driving tool.