Frangible Piston Stop Flange for Pump Retention and Protection

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Solution Overview

Problem

Existing piston pumps for dispensing fluids face issues such as user error leading to piston removal, damage during handling, and increased manufacturing costs due to separate components like protective caps, which can result in improper operation and increased waste.

Innovation Solution

A piston pump design featuring a removable stop flange member secured to the piston chamber-forming member, which prevents piston removal through a frangible connection, and a method for manufacturing and assembly that integrates a removable closure for the outlet, reducing the need for additional components and user confusion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a separate protective cap is used to prevent piston removal, then piston protection is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

Improvepiston protectionVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The protective cap and piston stop functions are merged into a single integrated stop flange member. This member includes both the protective cap portion that covers the piston and the stop flange portion that prevents piston removal, eliminating the need for separate protective cap and stop components.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The stop flange member serves multiple functions simultaneously: it acts as a protective cap covering the piston, a stop mechanism preventing piston removal, and a structural component of the pump assembly. This multi-functionality reduces the total number of parts needed.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Reliability

If a separate protective cap is used, then piston protection is improved, but manufacturing cost increases

Engineering Contradiction:

Improvepiston protectionVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

3Ease of operation

If the piston is removable, then ease of assembly is improved, but user error leading to improper operation increases

Engineering Contradiction:

Improveease of assemblyVSAvoidproper operation

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The stop flange member creates a physical barrier that prevents the piston from being accidentally removed or improperly positioned. The flange extends beyond the piston chamber opening to block removal, and the engagement surfaces ensure proper positioning before final assembly.

Inventive Principle:

Principle #9Preliminary anti-action

4Ease of operation

If the piston is removable, then ease of assembly is improved, but damage during handling increases

Engineering Contradiction:

Improveease of assemblyVSAvoiddamage during handling

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Inventive Principle:

Principle #9Preliminary anti-action

Data Source

PatentUS8701943B2Piston with frangible piston stop

Publication Date: 2014.04.22 GOTOHTI COM INC

AI summary

A piston pump assembly in which a piston-forming element to be received in a piston chamber of a piston chamber-forming member carries a removable stop flange member which may be secured to the piston chamber-forming member to provide a retention stop to prevent the piston-forming element from being removed from the piston chamber.