Scissors With Movable Transmission Member for Spring Interference
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Solution Overview
Problem
Existing scissors designs with springs for opening and closing often interfere with handle operation, making it difficult to smoothly open or close the scissors and hinder easy assembly and disassembly for maintenance, as the spring is fixed between handles.
Innovation Solution
Incorporating a movable transmission member attached to the first body portion with an urging member between it and the handle, and an interlocking mechanism to transmit the urging force to the second body portion, allowing independent operation of the spring and facilitating easy attachment and detachment of the second body portion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the spring is fixed between the two handles to assist opening and closing operations, then the opening and closing operation is assisted, but the spring may deform greatly and interfere with the handles, hampering smooth operation
Solution Approach 1:
The invention divides the scissors into separate body portions (first body portion and second body portion) that can be assembled and disassembled. The spring is integrated into the first body portion, separating the spring mechanism from the second body portion. This segmentation prevents the spring from interfering with handle operations while maintaining the assisting function, as the spring only needs to interact with components within the first body portion.
Solution Approach 2:
The invention introduces an interlocking mechanism as an intermediary between the spring and the second body portion. The interlocking mechanism transmits the urging force from the spring to the second body portion through the movable transmission member, allowing the spring to assist opening and closing operations without directly interfering with the handles. This intermediary structure enables force transmission while preventing harmful spring deformation interference.
2Ease of operation
If the spring is fixed between the two handles to assist opening and closing operations, then the opening and closing operation is assisted, but the spring hampers easy assembly and disassembly of the body portions for maintenance
Solution Approach 1:
The invention segments the scissors into modular body portions that can be independently assembled and disassembled. The spring is integrated into the first body portion, creating a modular design where the second body portion can be detached without affecting the spring mechanism. This segmentation enables easy maintenance and cleaning by allowing users to disassemble the body portions separately.
Solution Approach 2:
The invention extracts the spring mechanism from the overall scissors structure and integrates it specifically into the first body portion. This extraction allows the second body portion to be easily detached for maintenance purposes, as the spring and its associated components remain contained within the first body portion. The interlocking mechanism provides the connection interface that enables easy assembly and disassembly.
3Force
If the spring deforms greatly during operation, then the spring can provide sufficient urging force, but the spring may touch the handles and interfere with smooth operation
Solution Approach 1:
The invention introduces the interlocking mechanism and movable transmission member as intermediaries between the spring and the second body portion. These intermediaries transmit the urging force from the spring effectively while constraining the spring's movement path. The spring can deform sufficiently to provide the necessary force, but the intermediary structures prevent the spring from touching the handles and interfering with smooth operation.
Solution Approach 2:
The spring is integrated into the first body portion and works in conjunction with the interlocking mechanism to automatically provide urging force during opening and closing operations. The spring's deformation and force generation are self-regulated within the confines of the first body portion, eliminating the need for direct spring-handle interaction while maintaining effective force application through the interlocking mechanism.
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
This configuration reduces the influence of the urging member on handle operation, enabling smooth opening and closing of the scissors and allowing easy assembly and disassembly, improving user handling and maintenance accessibility.
Implementation Method 1
a spring for urging a pair of blades in such a direction that the blades close with respect to each other is provided between a pair of handles
Data Source
AI summary
Scissors include first and second body portions, and a pivot support portion that supports the first and second body portions. The scissors further include a movable transmission member attached to a handle of the first body portion, a spring provided between the handle of the first body portion and the movable transmission member, and rows of teeth configured to transmit urging force from the spring to the second body portion through the movable transmission member. The pivot support portion has a pivot and a pivot hole that enables the first and second body portions to be assembled and disassembled. The rows of teeth are provided on the movable transmission member and a handle of the second body portion, and can be attached to or detached from each other when assembling and disassembling the first and second body portions.