Valve Handle Slider Locking Mechanism for One-Handed Operation
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Solution Overview
Problem
Existing valve locking mechanisms are cumbersome, unsightly, and pose safety risks due to external collars that can pinch users and hinder one-handed operation, while also being susceptible to dirt and requiring special handle formations.
Innovation Solution
A slider-based locking mechanism that slides within a slot in the valve handle, featuring engagement tines and a padlock receiving aperture, with a retention mechanism for secure one-handed operation and tactile feedback, allowing for easy switching between lock and unlock positions without external collars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external locking collar is used to prevent inadvertent valve movement, then security against unauthorized tampering is improved, but the mechanism becomes unsightly and creates pinching hazards for users
Solution Approach 1:
The locking mechanism is nested within the handle structure itself. The slider is received within a slot in the handle, and the padlock aperture is integrated into the handle rather than being on an external collar. This nesting eliminates the external collar while maintaining the locking function.
Solution Approach 2:
The harmful external collar is completely removed from the design. The locking function is extracted and reimplemented using internal handle components (slider in slot, integrated padlock aperture), eliminating the pinching hazard while preserving security.
2Ease of manufacture
If a locking collar is positioned on a downwardly inclined section of the handle, then the mechanism is simpler to manufacture, but one-handed operation becomes difficult due to gravity urging the collar toward the locked position
Solution Approach 1:
The slider is designed to move dynamically within the slot along the longitudinal axis of the handle. The slot is positioned to allow the slider to be moved freely to either the locked or unlocked position, and the slider can be retained in either position using the padlock or spring mechanism, enabling easy one-handed operation.
Solution Approach 2:
The slider is pre-positioned within the slot such that it can be easily moved to the unlocked position before operation, and the padlock aperture is pre-positioned to allow quick engagement or disengagement of the padlock, facilitating one-handed use.
3Reliability
If an aperture is added to the handle to receive a padlock bail, then unauthorized tampering is prevented, but the handle requires special formation increasing manufacturing complexity
Solution Approach 1:
The slot in the handle serves multiple functions: it guides the slider movement, provides a track for the locking mechanism, and integrates with the padlock aperture to form the complete locking system. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The padlock aperture is merged with the handle structure rather than being a separate component. The aperture is formed as an integral part of the handle, combining the handle and locking features into a single unified structure, thereby reducing overall device complexity.
4Loss of information
If a separate locking collar is provided on the outside of the handle, then the locking function is clearly visible, but the mechanism accumulates dirt and detritus affecting smooth movement
Solution Approach 1:
The locking mechanism components (slider, engagement means) are nested within the handle structure and slot, protecting them from external contamination while maintaining visibility of the locking status through the integrated design.
Solution Approach 2:
The handle structure acts as a protective shell that encloses the slider mechanism, shielding it from dirt and detritus while allowing the locking status to be observed through the overall handle position and integrated indicators.
Data Source
AI summary
A locking mechanism for a valve handle has a slider arranged to slide back and forth in a slot in the valve handle, between a lock position, in which the slider engages with a stop on the valve body and an unlock position, in which the slider does not engage with a stop. The slider is formed in two parts, which are inserted from opposite sides of the slot and snap fit together. The slider has indicia to indicate whether the slider is in the lock or unlock position, and the slider is arranged so as to cover the fastener which attaches the valve handle to the valve body.