Test Cock Stem With Integrated Broken-Port Extraction Interface
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Solution Overview
Problem
Existing test cocks often have stems that break off within the port, making it difficult and time-consuming to extract them.
Innovation Solution
A test cock design with an integrated extraction tool, featuring a non-circular intake opening and a matching protruding end that allows for easy removal of broken stems using a corresponding shaped tool.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a small threaded stem is used to connect the test cock to the port, then the test cock can be securely attached, but the stem may break off during removal leaving it lodged in the port with no easy way to unscrew
Solution Approach 1:
The stem is segmented into two functional parts: an external threaded portion for connection to the port, and an internal non-circular opening for tool engagement. This segmentation allows the stem to provide strong threaded connection while simultaneously enabling easy extraction through the integrated extraction tool interface.
Solution Approach 2:
The stem includes an integrated extraction tool interface (non-circular opening) that allows the stem to be self-extractable. By incorporating the extraction mechanism directly into the stem structure, the design eliminates the need for separate extraction tools or complex removal procedures, enabling easy unscrewing even when the stem is broken off.
2Reliability
If the stem is made with external threads for connection, then secure attachment is achieved, but extraction becomes difficult and time-consuming when the stem breaks
Solution Approach 1:
The non-circular opening is pre-formed in the stem during manufacturing, preparing the extraction interface in advance. This preliminary action ensures that when the stem needs to be removed (even if broken), the extraction tool can immediately engage with the pre-prepared interface, eliminating the need for creating extraction access during the removal process.
Solution Approach 2:
The non-circular opening acts as an intermediary interface between the broken stem and the extraction tool. This intermediary structure allows force to be effectively transmitted from the extraction tool to the stem, enabling easy removal without direct contact with the broken stem surface.
3Ease of operation
If a non-circular opening is created in the stem, then extraction tool engagement is enabled, but the stem structure becomes more complex
Solution Approach 1:
The non-circular opening serves multiple functions: it provides the extraction tool engagement interface, maintains structural integrity of the stem, and can be integrated with the threading process. By making the opening universal for standard extraction tools, the design adds extraction capability without proportionally increasing complexity.
Data Source
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AI summary
A test cock is configured to connect to a test cock port. The test cock includes a body portion defining a flowpath between a distal end and a proximal end. The test cock includes an intake stem at the proximal end that has external threads to connect the test cock to the test cock port. The intake stem defines an intake opening connected to the flowpath, the intake opening having a non-circular shape, such as a hexagonal shape. The test cock also includes an extraction tool having an end forming the non-circular shape of the intake opening, the end being sized to fit within and engage the intake opening.