Bobby Pin Spring Mechanism for Effortless Hair Clamping
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Solution Overview
Problem
Conventional bobby pins require substantial finger strength to open and close, making them inefficient for clamping and releasing hair.
Innovation Solution
A bobby pin design featuring a left and right body with teeth that automatically engage for clamping and a pivotal pin with a compression and torsion spring mechanism for easy opening, allowing for one-handed operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional bobby pin uses only a torsion spring mechanism, then the structure is simple, but substantial finger strength is required to open and close the bobby pin
Solution Approach 1:
The patent combines a torsion spring mechanism and a compression spring mechanism into a single integrated spring assembly. The torsion spring provides rotational force to open the bobby pin bodies, while the compression spring provides linear force to maintain the closed position and assist in the opening action. This merging of two spring mechanisms resolves the contradiction by providing ease of operation through combined mechanical advantage while keeping the overall structure compact and integrated rather than separate complex systems.
Solution Approach 2:
The patent introduces a pivot pin as an intermediary element that connects the left and right bodies and serves as the mounting point for both spring mechanisms. The pivot pin mediates between the rotational motion required for opening and the linear compression force needed for closing assistance. This intermediary component enables the coordinated action of both springs without requiring separate complex linkages, thus improving ease of operation while maintaining structural simplicity.
2Reliability
If a bobby pin uses teeth engagement for clamping, then the clamping firmness is improved, but the device complexity increases due to additional engagement structures
Solution Approach 1:
The patent segments the engagement interface into multiple small teeth distributed along the inner surfaces of the left and right bodies. Instead of a single complex locking mechanism, multiple simple teeth provide distributed engagement points that collectively achieve firm clamping. This segmentation resolves the contradiction by improving reliability through cumulative engagement while keeping each individual tooth simple in structure, avoiding the need for complex single-point locking mechanisms.
Solution Approach 2:
Instead of using a complex positive locking mechanism to secure the bobby pin, the patent employs a negative locking approach where the teeth are designed to naturally engage through elastic deformation of the bodies. The compression spring maintains constant pressure that forces the teeth into engagement, inverting the conventional approach where active locking forces are applied. This inversion achieves reliable clamping through passive elastic engagement rather than active mechanical locking, reducing overall device complexity.
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
Enables effortless clamping and release of hair with reduced manual effort, providing a more user-friendly and efficient hair-clamping experience.
Implementation Method 1
a pivotal pin inserted through two root portions respectively provided in the left body and the right body, a compression spring and a torsion spring
Implementation Method 2
a pivotal pin inserted through two root portions respectively provided in the left body and the right body, a compression spring and a torsion spring
Data Source
AI summary
A bobby pin includes a left body and a right body respectively having plural ribs that are formed with plural teeth for engaging with each other to keep hair firmly clamped. The left and the right body have an opening device that is provided with a root member respectively, with a pivotal pin mounted with a compression spring and a torsion spring. In using, press inward the two bodies to keep the teeth engaged with each other for clamping hair. And, as long as the opening device is pressed, the two bodies can be immediately separated from each other for releasing hair.