Rotatable Hair Trimmer Head Locking Mechanism
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Solution Overview
Problem
Conventional hair trimming devices with pivotable heads face difficulties in precise positioning when the comb attachment is removed, leading to irregular cuts due to the head's inclination relative to the body, and users often experience discomfort and risk of injury while trimming hard-to-reach areas.
Innovation Solution
A hair trimming device with a rotatable head portion that is locked in place when the comb attachment is detached, allowing precise positioning and preventing rotation, and becomes freely rotatable when the comb attachment is attached, enabling the head to follow the contours of the head for uniform cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the head portion is made rotatable to follow head contours, then ease of operation is improved, but manufacturing precision deteriorates when comb is removed
Solution Approach 1:
The head portion is designed with dynamic positioning capability - it can rotate freely when comb attachment is present to follow head contours, and lock into a fixed position when comb is removed for precise trimming. This dynamic behavior resolves the contradiction by adapting the head's rotational state based on operational mode.
Solution Approach 2:
The locking mechanism changes the rotational parameter of the head portion based on comb attachment state. When comb is attached, the head can rotate; when comb is removed, the head locks at a predetermined angle. This parameter change resolves the contradiction between rotational freedom and positioning precision.
2Manufacturing precision
If the head portion is fixed to housing, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The head portion transitions from a static fixed connection to a dynamic connection that can rotate when comb is attached and lock when removed. This dynamic design allows the system to achieve both fixed positioning precision and rotational ease of operation under different conditions.
Solution Approach 2:
The head portion serves dual functions: it can be fixed for precision work and rotatable for contour following. The locking mechanism enables the same head assembly to perform both functions, resolving the contradiction between fixed positioning and operational flexibility.
3Adaptability or versatility
If the head portion is rotatable for contour following, then adaptability is improved, but stability deteriorates during precise trimming
Solution Approach 1:
The head portion's stability is dynamically adjusted based on comb attachment. When comb is present, the head can rotate for adaptability; when comb is removed, the locking mechanism provides stability by preventing rotation. This dynamic stability resolution allows both adaptability and precision trimming.
Solution Approach 2:
The locking mechanism acts as an intermediary that mediates between the rotatable head and fixed housing. It provides stability when needed by locking the head at a predetermined angle, while allowing rotational freedom when the comb is attached for contour following.
4Manufacturing precision
If the head portion is fixed at predetermined angle, then manufacturing precision is improved, but adaptability deteriorates
Solution Approach 1:
The head portion is designed with multi-functionality - it can be fixed at a predetermined angle for precision work and rotatable for contour following. The locking mechanism enables the same assembly to perform both functions, resolving the contradiction between fixed positioning and adaptability.
Solution Approach 2:
The rotational parameter of the head portion is changed based on comb attachment state. When comb is removed, the head locks at a predetermined angle for precision; when comb is attached, the head can rotate for adaptability. This parameter change resolves the contradiction between fixed positioning and adaptability.
Data Source
AI summary
A device for trimming hair comprising a housing (3) and a head portion (9) with a cutting blade assembly (10), wherein the head portion (9) is rotatably mounted to the housing (3) and a comb attachment (20) is releasably attachable to the device to extend over the cutting blade assembly (10), the device further comprising a locking means (30,50) configured to fixedly engage the head portion (9) with the housing (3) when a comb attachment (20) is detached from the device such that the head portion (9) is prevented from rotating relative to the housing (3) and configured to disengage the head portion (9) from the housing (3) when a comb attachment (20) is attached to the device such that the head portion (9) is rotatable relative to the housing (3).