S-Shaped Back Shaver Handle Leverage and Sensory Feedback
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Solution Overview
Problem
Men face challenges in accessing and shaving their own backside effectively due to the difficulty in reaching this area, leading to reliance on partners or professional services, and existing elongated handles with curved or angled designs often fail to provide sufficient leverage and stability.
Innovation Solution
An s-shaped elongated handle with a blade attachment and sensory gap design, featuring a body leverage surface and ergonomic grip, allows for improved access and stability by leveraging the forearm and stimulating mechanoreceptors for effective two-point discrimination during shaving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional elongated handle with curved or angled design is used, then the blade can reach the backside, but the handle lacks sufficient leverage and stability
Solution Approach 1:
The patent applies an S-shaped curved configuration to the elongated handle, which allows the blade to reach the backside while maintaining proper ergonomic alignment. The curvature enables the handle to conform to the body's contour, providing both access and mechanical advantage through the curved geometry that distributes force more effectively along the handle's length.
2Ease of operation
If the handle is made longer to reach the backside, then access is improved, but wrist and shoulder strain increases
Solution Approach 1:
The patent introduces a second grip position on the elongated handle, allowing the user to shift from a first grip position (closer to the blade) to a second grip position (farther from the blade). This dimensional change in grip location alters the leverage mechanics, distributing the mechanical load across different segments of the arm and reducing strain on the wrist and shoulder while maintaining reach to the backside.
3Measurement precision
If a partner shaves the backside, then shaving precision is improved, but independence and convenience are reduced
Solution Approach 1:
The patent incorporates a sensory gap feature in the elongated handle that allows tactile feedback from the backside skin to be transmitted to the user's hand. This feedback mechanism enables the user to sense pressure, skin texture, and blade contact, providing the proprioceptive information needed to maintain shaving precision independently without requiring visual confirmation or partner assistance.
4Measurement precision
If a professional service is used, then shaving quality is improved, but cost and time are increased
Solution Approach 1:
The patent enables self-service back shaving through the combination of the elongated S-shaped handle with ergonomic grip positions and tactile feedback features. The design allows the user to perform the shaving task independently at home, eliminating the need to schedule and travel to professional services, thereby recovering both time and monetary resources while maintaining acceptable shaving quality through proper ergonomic design.
Data Source
AI summary
A back shaver handle has a generally s-shaped elongated member. A grip has a finger surface located on the inner side. A blade attachment at a blade end is located on the inner side. A body leverage surface is located on an outer side of the elongated member near a midway between the grip and the blade end configured to press a body leverage surface against a user's forearm when a finger surface and grip are respectively gripped by fingers and hand with thumb facing away from the blade end of a same arm of the user and the s-shaped elongated member is reaching the blade end under an armpit of the same arm of the user to leverage the blade attachment located on the inner side of the elongated member towards a torso backside of the user.