Hair Clipper Guard Blade Stop Mechanism
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Solution Overview
Problem
Hair cutting devices often fail to prevent the cutting blade from coming too close to the user's skin, leading to irritation or injury, especially when the guard blade is moved beyond its intended position due to user forces or mechanical tolerances.
Innovation Solution
A hair cutting device with a movable guard blade and a stop mechanism that prevents the guard blade from moving beyond a predetermined position, combined with a guard biasing element like a torsion spring to maintain the shortest cutting length and reduce relative movement between the blades, ensuring a minimum distance between the cutting blade and the guard blade.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the guard blade is made movable to allow length adjustment, then adaptability is improved, but reliability deteriorates due to risk of blade contact with skin
Solution Approach 1:
The stop mechanism is pre-positioned on the blade carrier to prevent the guard blade from moving beyond the safe first guard position. This preliminary constraint counteracts any forces that might cause the guard blade to retract too far and expose the cutting blade to the user's skin, thereby resolving the reliability issue while preserving adjustability.
Solution Approach 2:
The stop acts as an intermediary element between the movable guard blade and the blade carrier. It mediates the movement of the guard blade by providing a physical barrier at the first guard position, preventing excessive retraction without interfering with the intended range of motion for length adjustment.
2Ease of manufacture
If mechanical tolerances and component movement are allowed, then ease of manufacture is improved, but manufacturing precision deteriorates leading to unpredictable cutting length
Solution Approach 1:
The stop mechanism is pre-installed on the blade carrier during manufacturing to establish a definitive first guard position. This preliminary action ensures that even with normal component movement and tolerances, the guard blade cannot move beyond the predetermined safe position, maintaining consistent and predictable cutting lengths across all devices.
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 solution effectively prevents the cutting blade from becoming too close to the skin, reducing the risk of skin damage and maintaining a consistent cutting length, enhancing the device's robustness and predictability of haircuts.
Implementation Method 1
The hair cutting device further comprise a guard biasing element for biasing the guard blade to the first guard position
Data Source
AI summary
A hair cutting device having a cutting unit, the cutting unit including a blade carrier carrying a cutting blade that has cutting teeth; a guard blade that has guard teeth. The blade is movable along the blade carrier relative to the cutting blade within a guard length range between a first guard position corresponding to a shortest hair cutting length of the cutting unit and a second guard position corresponding to the longest hair cutting length of the cutting unit. The blade carrier includes a stop configured to prevent movement of the guard blade past the first guard position and outside of the guard length range, thereby preventing the cutting length from being below the shortest cutting length.