Biased Pliers With Torsion Spring Biasing Mechanism
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Solution Overview
Problem
Conventional pliers can be difficult to open in tight spaces, especially when only one hand is available, due to the need to move both handle portions, leading to usability issues.
Innovation Solution
The design incorporates fixed-joint pliers with a torsion spring biasing mechanism that keeps the jaws in an open position, allowing easy pivoting to a closed position without binding, featuring a thin profile and planar exterior for improved maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional pliers are used without a biasing mechanism, then the structure remains simple, but the user cannot easily open the pliers in tight spaces when gripping with one hand
Solution Approach 1:
The torsion spring is pre-loaded to automatically bias the pliers toward the open position, so that when the user releases the handles, the pliers return to open without requiring additional manual action. This preliminary biasing action solves the problem of difficulty in opening pliers in tight spaces.
Solution Approach 2:
The pliers are divided into functionally independent components: the biasing mechanism (torsion spring) is separated from the gripping mechanism (handles and jaws), allowing each to perform its specific function optimally. The biasing mechanism provides automatic opening assistance while the user applies force only to close the jaws.
2Length of moving object
If the pliers are designed with a thin profile for maneuverability in tight spaces, then the device can access confined areas, but the housing structure becomes more complex to accommodate the biasing member
Solution Approach 1:
The torsion spring is nested within the housing structure, with the spring body positioned inside the cavity formed by the first and second housing portions. The coupler extends through the housing to connect the handles, while the spring remains contained within the housing, achieving a thin external profile while accommodating the biasing mechanism internally.
Solution Approach 2:
The biasing mechanism is arranged in a planar configuration where the torsion spring body and its ends lie substantially in the same plane, allowing the spring to fit within a thin housing section. This dimensional arrangement enables the thin profile of the pliers while still providing effective biasing force.
3Ease of operation
If the coupler extends through the housing to connect the handles, then the handles can pivot smoothly without binding, but the coupling mechanism becomes more complex
Solution Approach 1:
The coupler acts as an intermediary element that connects the first and second handles while extending through the housing. This intermediate component allows the handles to pivot relative to each other smoothly, preventing binding while maintaining a relatively simple overall structure. The coupler mediates between the biasing mechanism and the user-applied forces.
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
The solution enables easy operation of pliers in confined spaces with a thin profile and smooth rotation, reducing manufacturing complexity and enhancing user comfort and efficiency.
Implementation Method 1
a biasing member, the biasing member comprising a torsion spring having a body having a first end and a second end, the first end engaging the first housing portion and the second end engaging the second housing portion
Implementation Method 2
the first and second tool levers are biased to an open jaw position by the biasing member
Data Source
AI summary
A tool, such as fixed-joint pliers, has first and second levers which are movably joined. The levers are joined at a joint comprising a housing and a coupler. The housing is defined by a first housing portion of the first lever and a second housing portion of the second lever. The housing has an interior area which houses a biasing member, such as a torsion spring. The coupler may comprise first and second bushings which extend through a passage through the housing and the torsion spring therein, and a male fastener which extends through one of the bushings and into engagement with the other bushing. The pliers have a thin profile and are biased to an open position for use.