Flashlight Bezel Focus Lock Mechanism
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Solution Overview
Problem
Flashlights often inadvertently change focus when the bezel is bumped or removed from a holder, leading to unintended adjustments in the light beam's size and intensity.
Innovation Solution
A bezel locking assembly that includes a ring-shaped outer component and an inner component with a nub, allowing the bezel to be rotated to lock the focus position, preventing accidental changes by using a gap and ridges to secure the bezel in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the bezel is made movable to allow focus adjustment, then the user can adjust the light beam size and intensity, but the focus may be inadvertently changed when the bezel is bumped or pressed against a surface
Solution Approach 1:
The bezel is designed to be movable during normal operation to allow focus adjustment, but becomes fixed when locked. The system dynamically transitions between movable and fixed states based on user action, resolving the contradiction between ease of adjustment and stability during use.
Solution Approach 2:
The locking function is extracted as a separate mechanism from the bezel itself. The locking assembly independently engages with the bezel to prevent movement, allowing the bezel to maintain its primary function of focus adjustment while adding a secondary function of position locking.
2Reliability
If a locking mechanism is added to prevent inadvertent focus changes, then the focus position stability is improved, but the device complexity increases
Solution Approach 1:
The locking assembly is designed to be self-actuating through user interaction. Rotating the bezel in a specific direction automatically engages the locking mechanism without requiring separate controls or complex actuation systems, simplifying the overall device complexity while maintaining reliability.
Solution Approach 2:
The locking function is merged with the existing bezel rotation mechanism. The same rotational motion used for focus adjustment also activates the locking function, combining two functions into one mechanical action and reducing overall system complexity.
3Reliability
If the bezel is locked in place, then the focus position stability is improved, but the ease of operation for focus adjustment is reduced
Solution Approach 1:
The system dynamically switches between locked and unlocked states based on user action. The bezel transitions from a fixed state during normal operation to an unlocked state when the user intends to adjust focus, and then returns to locked state after adjustment, maintaining both stability and accessibility.
Solution Approach 2:
The locking mechanism prevents inadvertent changes during normal use, but the design anticipates and facilitates easy unlocking when needed. The rotation-based unlocking mechanism is built into the normal operation, making the transition from locked to unlocked state intuitive and requiring minimal additional effort.
Data Source
AI summary
Embodiments provide a flashlight with a bezel configured to be moved relative to a body of the flashlight to adjust the focus of the light. A locking assembly may be disposed within the bezel and configured to switch between an unlocked position and a locked position if the bezel is rotated with respect to the body. The locking assembly may include a ring-shaped outer component having first and second curved walls separated by a gap. The locking assembly may further include an inner component coupled with the light assembly, the inner component including a nub configured to be disposed in the gap if the locking assembly is in the unlocked position, and to radially push an outer surface of the outer component against the inner surface of the bezel if the locking assembly is in the locked position.