Chain Saw Hazard Warning Light for Chain Shot Safety
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Solution Overview
Problem
Power chain saw operators and nearby personnel are at risk of injury from flying chain fragments due to broken chains, as existing safety measures fail to effectively warn those outside the immediate operator zone of potential hazards, particularly in the context of forest harvesters where chain shot can penetrate the cab or affect nearby individuals.
Innovation Solution
A chain saw hazard warning light system that projects flashing strobe lights into a defined danger zone around the chain guide bar, emitting beams in opposite directions to alert personnel of potential chain shot, activated only when the cutting chain is rotating, using a housing with slotted openings and light emitting diode (LED) sources aligned to illuminate the zone effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a protective wall or safety guard is positioned near the chain drive to intercept broken chain, then the chain shot hazard to nearby personnel is reduced, but the device complexity and obstruction to operator visibility increase
Solution Approach 1:
The patent replaces mechanical protective structures (walls, guards) with an optical warning system (strobe light). The strobe light projects visible beams into the danger zone to alert personnel of chain shot hazards, eliminating the need for complex mechanical barriers while maintaining safety warnings.
Solution Approach 2:
The patent introduces light as an intermediary medium to communicate danger. Instead of physically blocking the hazard, the strobe light creates visible beams that serve as a mediator to warn personnel of the dangerous zone, allowing them to take evasive action without requiring physical barriers.
2Loss of information
If a sound warning system is used to alert personnel of chain shot danger, then the warning can be heard, but the warning is drowned out by the loud noise of the chain saw operation
Solution Approach 1:
The patent replaces the acoustic warning system with an optical warning system. The strobe light emits visible light beams that are not affected by the loud noise of chain saw operation, providing clear warning signals that can be seen rather than heard, thus overcoming the noise interference problem.
3Loss of information
If a hazard warning light projects light into the chain shot danger zone, then nearby personnel are warned of potential hazards, but the light may interfere with operator vision or create glare
Solution Approach 1:
The patent applies local quality by directing the strobe light beams specifically into the danger zone where chain shot may travel, rather than illuminating the entire workspace. The light is concentrated in specific angular sectors (e.g., 45-degree angles from the guide bar plane) to warn personnel in those specific areas without creating general glare or interfering with operator vision in other areas.
4Area of stationary object
If the warning light illuminates only the plane of the chain guide bar, then the direct chain shot path is covered, but personnel at angles to the guide bar plane are not warned
Solution Approach 1:
The patent expands the warning coverage from a two-dimensional plane (the guide bar plane) to a three-dimensional angular sector. Multiple strobe lights are positioned to project beams at various angles (e.g., 45 degrees above and below the guide bar plane, and at lateral angles) to cover the spherical danger zone around the guide bar, ensuring personnel in any direction are warned of potential chain shot.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system provides a visual warning to both the operator and nearby personnel of the chain shot danger zone, enhancing safety by ensuring they are aware of the hazard and can take necessary precautions, thereby reducing the risk of injury from flying chain fragments.
Implementation Method 1
a first electric light source means mounted within said housing adjacent to, and distance d from, said first slotted opening and facing said first direction, and a second electric light source means mounted within said housing adjacent to, and distance d from, said second slotted opening and facing said second direction
Data Source
AI summary
A chain saw hazard warning light and method for using same. A pair of oppositely-directed light sources emit light beams throughout a chain shot hazard warning zone through rectilinear, slotted openings at opposite ends of a housing. The light beams turn on, if and only if, the cutting chain is rotating about the chain guide bar; alternatively, initiation of rotation of the cutting chain is delayed to permit the light beams to turn on some time prior thereto. The zone is defined by first and second pairs of planes that diverge in opposite directions from the chain guide bar, said planes being disposed at equal, acute angles (most preferably 15°) to, and on opposite sides of, a plane that includes the chain guide bar.