Cantilever Headlamp Bracket With Pawl Detent
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Solution Overview
Problem
Designing a compact tiltable headlamp where the power source and illumination source are contained in the same housing poses challenges, including bulkiness and difficulty in battery replacement, due to the need for a robust detent mechanism and proper pivot axis placement.
Innovation Solution
The housing with both sources is rotatably mounted in a cantilever fashion on a bracket with a collar and pawl mechanism, minimizing the distance between the bracket and housing, allowing for a compact structure and reliable detent support, while keeping the power source compartment accessible for easy battery installation and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the detent mechanism is located between the bracket and the lamp housing, then the lamp can be held firmly in selected positions, but the housing must be spaced forward of the bracket resulting in a bulky structure
Solution Approach 1:
The pawl is laterally displaced from the housing and positioned in the collar, moving the detent mechanism from a position between the bracket and housing to a position on the side of the housing. This dimensional relocation allows the housing to extend closer to the bracket, reducing overall structure volume while maintaining detent functionality.
Solution Approach 2:
The collar serves as an intermediary component that houses the pawl mechanism. By placing the pawl in the collar rather than directly between the bracket and housing, the design enables compact housing positioning while maintaining reliable detent support through the collar's structural connection to the bracket.
2Device complexity
If the power source is contained in the same housing with the illumination source, then the headlamp structure can be more integrated, but battery replacement becomes difficult
Solution Approach 1:
The housing is segmented into functional zones with the power source compartment positioned at the rear end of the housing, accessible from the back. This segmentation maintains integration while providing dedicated access pathways for battery replacement without requiring disassembly of the entire housing or interference with the tilting mechanism.
3Device complexity
If the housing is pivoted on a pivot axis near its center of gravity, then the tilting mechanism can be simplified, but the detent mechanism becomes less robust in supporting the housing
Solution Approach 1:
The collar is designed with substantial structural support and the pawl mechanism is positioned to provide counterbalancing support for the housing weight. The collar's robust construction and its connection to the bracket create a counterweight effect that compensates for the simplified pivot axis positioning, ensuring the detent mechanism can reliably support the housing in any tilted position.
Data Source
AI summary
In a personal headlamp, a housing, containing both an illumination source and a power source, is mounted in cantilever fashion on a bracket that comprises a back part and a collar fastened to, and extending forward from, the back part. A resilient pawl, which extends from the back part through a slot in the collar, is engageable with any selected one of a series of circumferentially spaced notches formed on a ring-like protrusion on the housing that fits rotatably into the collar.