Integrated Test Cock Extraction for Broken Stem Removal
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Solution Overview
Problem
Existing test cocks often have stems that break off during removal from test cock ports, leading to a tedious and labor-intensive extraction process when the stem becomes lodged.
Innovation Solution
A test cock design featuring a non-circular intake opening and an integrated extraction tool with a matching non-circular shape, allowing for easy extraction of broken stems using a corresponding shaped tool, such as hexagonal, double-hex, polydrive, or torx shapes, which can be rotated to disengage the stem from the port.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a small threaded stem is used to connect the test cock to the port, then the test cock can be securely connected, 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 divided 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 serve both connection and extraction functions independently.
Solution Approach 2:
The non-circular opening is pre-formed in the stem during manufacturing, before any potential breakage occurs. This preliminary preparation ensures that extraction tools can be immediately applied to broken stems without requiring additional equipment or complex procedures.
2Productivity
If a broken stem is left lodged in the port, then the connection function is compromised, but manual extraction becomes long and tedious
Solution Approach 1:
The stem includes an integrated non-circular opening that serves as its own extraction interface. This self-service feature eliminates the need for specialized extraction equipment or complex procedures, allowing for quick removal using simple hand tools.
Solution Approach 2:
Instead of designing the stem for easy installation only, the invention inverts the approach by incorporating an extraction interface directly into the stem structure itself, making the extraction process as straightforward as the installation process.
3Ease of operation
If a non-circular opening is incorporated in the stem, then extraction tools can engage and rotate the stem for easy removal, but the stem design becomes more complex
Solution Approach 1:
The stem features a non-circular (asymmetric) opening that provides mechanical advantage for tool engagement. This asymmetric geometry prevents the stem from rotating freely during installation while allowing controlled rotation during extraction when the tool is applied.
Solution Approach 2:
The non-circular opening serves multiple functions: it acts as a structural feature during installation to prevent over-tightening, and as an extraction interface when the stem needs to be removed. This multi-functionality reduces the need for separate extraction mechanisms.
Data Source
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.