Pneumatic Tool Forward Reverse Rotation Control Structure

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Solution Overview

Problem

Existing pneumatic tools face challenges in securely controlling forward and reverse rotations due to the inability to manufacture a forward and reverse rotation control structure via molding, leading to issues with permanent bonding using adhesive gel or screw fastening, which complicates replacement and repair, and the structure of hooks that tend to slip or snap off.

Innovation Solution

A pneumatic tool design utilizing a positioning pin that penetrates into a housing to secure a retaining member, allowing for easy removal and replacement, and incorporating a retaining member with a sliding block and slot wall configuration to prevent slippage and snapping, enhancing structural strength between components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If adhesive gel is used for permanent bonding of the retaining piece, then the retaining piece is securely fixed, but the retaining piece cannot be subsequently removed for replacement or repair

Engineering Contradiction:

Improvesecuring reliabilityVSAvoidreplacement ease

Core Design Contradiction:

ReliabilityVSEase of repair

Solution Approach 1:

The retaining member is divided into multiple parts: the retaining piece (molded with the housing), the positioning pin (inserted through the housing), and the retaining arm (secured to the positioning pin). This segmentation allows each component to perform its specific function while enabling easy replacement of individual parts without affecting the entire assembly.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The positioning pin serves as an intermediary component that connects the housing to the retaining arm. It penetrates through the housing and provides a secure attachment point for the retaining arm, while also serving as a removable element that facilitates maintenance and repair operations.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If screws are used for fastening the retaining piece, then the retaining piece is securely fixed, but there are drawbacks of damaged threads and unpleasant appearance due to the exposure of the screw heads

Engineering Contradiction:

Improvesecuring reliabilityVSAvoidappearance quality

Core Design Contradiction:

ReliabilityVSShape

Solution Approach 1:

The screw fastening elements are extracted from the design entirely. Instead of using screws to attach the retaining piece to the housing, the invention uses an integrated molding approach where the retaining piece is formed as part of the housing, eliminating visible screw heads and thread damage while maintaining secure attachment through the positioning pin mechanism.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The retaining piece is merged with the housing through molding formation, creating an integrated structure. The positioning pin then provides the necessary mechanical connection without requiring separate fastening elements, combining the benefits of integrated appearance with secure mechanical attachment.

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If the structure of hook is used between a push button and a push button retainer plate, then retention is achieved, but the hook structure tends to slip off or snap off

Engineering Contradiction:

Improveretention functionVSAvoidstructural stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

Instead of using a hook structure that relies on the retaining piece to actively engage with the push button, the design inverts the approach by using the positioning pin to passively secure the retaining arm to the housing. The retaining arm then provides the retention function through its structural configuration rather than through an active hook engagement, reducing stress concentration and preventing slippage or snapping.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS11654542B2Pneumatic tool with forward and reverse rotation control structure

Publication Date: 2023.05.23 BASSO IND CORP

AI summary

A pneumatic tool with a forward and reverse rotation structure includes a housing, a retaining member, two push buttons and a positioning pin. The housing includes an installation space. The retaining member is arranged inside the installation space to divide it into two push button accommodating cavities. The two push buttons movably slide inside the two push button accommodating cavities. The retaining member restricts the sliding ranges of the two push buttons. The positioning pin penetrates into the housing to allow the retaining member to be secured by the housing and the positioning pin. Accordingly, the retaining member is secured firmly while allowing it be removed for replacement and repair, the positioning pin is prevented from slippage, and any slipping off or snapping off of components between the sliding block of the push button and the slot wall of the retaining member can also be prevented.