Chain Wheel Valve Lockout Device with Nested Lid and Pin
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Solution Overview
Problem
Existing devices for locking out chain wheel operated valves are cumbersome and inefficient, making it difficult to secure and contain the chain, especially when valves are located overhead, posing a risk of accidental activation of power sources.
Innovation Solution
A compact lockout device with a body, pivotally attached lid, and a downwardly extending pin that secures the chain loop, combined with a closure mechanism for positive locking and optional features like apertures for drainage and a handle for ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing chain locking devices are used to secure the chain loop, then the chain can be locked out, but the devices are large and cumbersome
Solution Approach 1:
The patent employs a nested structure where the chain containment wall receives and secures the chain loop within its interior volume. The lid then covers the opening to enclose the chain, creating a compact nested arrangement that provides secure lockout without requiring large or cumbersome external structures.
2Device complexity
If the chain loop is left unsecured, then the device remains simple and accessible, but accidental activation of power sources can occur
Solution Approach 1:
The patent implements preliminary locking action by providing a pre-configured containment structure with a lid and closure mechanism. The worker can simply place the chain loop within the containment wall and secure the lid, creating a preliminary lockout state before work begins. This preliminary action prevents accidental activation without requiring complex additional mechanisms.
Data Source
AI summary
The lockout device has a body with one or more continuous sidewalls, an open end and a bottom defining an interior volume. It also has a lid pivotally attached to at least one of the sidewalls and moveable between an open and closed position. The lid is located to cover at least a portion of the open end of the body when in the closed position. The device also has a closure mechanism capable of holding the lid in a closed position. A pin extends at a downward angle from one of the side across a gap in the lid.