Scissors with Sliding Protective Cover for Tape Cutting

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing scissors are inconvenient and pose safety hazards when used to cut transparent tape or packaging tape on boxes, as they require opening the blades relative to each other, leading to exposure and potential hand scratches, and the assembly of torsion springs with pins creates friction issues.

Innovation Solution

A pair of scissors with a first and second cutting member connected by a movable connecting nail and protective gasket, allowing relative movement between the members for safe and efficient cutting, with a locking mechanism to prevent accidental opening and reduce friction.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If traditional scissors are used to cut transparent tape or packaging tape, then the blades can be opened and closed, but the blades are exposed during operation creating safety hazards and inconvenient usage

Engineering Contradiction:

Improveconvenience of cutting operationVSAvoidsafety hazard from exposed blades

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The scissors are divided into two functional segments: a first cutting member with a blade for cutting, and a second cutting member with a protective cover. The second cutting member can slide along the first cutting member to expose or cover the blade, segmenting the function of cutting and protection into separate components that work together

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second cutting member acts as an intermediary between the user and the sharp blade of the first cutting member. It provides a protective cover that can be slid to expose the blade only when needed for cutting, mediating between the safety requirement and the cutting functionality

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a torsion spring is arranged at the sliding position to hinder relative sliding between blades, then the blades can be secured, but the assembly becomes complex and friction is created at the pivoting pin

Engineering Contradiction:

Improvestability of blade positionVSAvoidassembly complexity of torsion spring and pin

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The complex torsion spring mechanism is extracted and replaced with a simpler sliding and locking mechanism. The second cutting member slides along the first cutting member and locks into place using a locking groove and protrusion, eliminating the need for torsion springs and complex pivoting pins

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The torsion spring-based mechanical system is replaced with a direct sliding and locking mechanism. The locking groove and protrusion provide a simpler, more reliable way to secure the blade position without requiring elastic components or complex pivot joints

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of operation

If the first cutting member and second cutting member are staggered for cutting, then the blade can be exposed, but the other blade remains exposed creating safety hazards

Engineering Contradiction:

Improvecutting capabilityVSAvoidsafety hazard from exposed blade

Core Design Contradiction:

Ease of operationVSObject-affected harmful factors

Solution Approach 1:

Instead of exposing the blade to enable cutting and then worrying about safety, the design inverts the approach: the blade is always covered by the second cutting member, and only exposed when needed for cutting. This reverses the traditional scissor operation where blades are inherently exposed

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS11485033B1Scissors

Publication Date: 2022.11.01 YANGJIANG GANGFU IND CO LTD

AI summary

A pair of scissors for opening a box includes a first cutting member and a second cutting member. The first cutting member is provided with a first handle on an end thereof, and the second cutting member is provided with a second handle on an end thereof. The scissors further include a connecting nail and a movable hole defined on the first cutting member. The movable hole is arranged for the connecting nail to move, and the connecting nail passes through the movable hole and is connected with the second cutting member, so that the first cutting member pivots around the second cutting member by the connecting nail. The connecting nail is movable in the movable hole which allows the first cutting member to move relatively to the second cutting member. The scissors have the advantages of simple structure, low cost and convenient operation.