U-Shaped Pliers Limb With Offset Pivot Axis
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Solution Overview
Problem
Existing pliers designs struggle to achieve an optimal force transmission ratio due to the alignment of the pivot axis with the working regions, limiting their efficiency in applications like cutting.
Innovation Solution
The pliers limbs are designed with a U-shaped configuration, where one limb has a pivot axis passing through it, allowing lateral offset of the pivot axis relative to the working region, and featuring different lengths and an offset pivot axis position for enhanced lever ratios and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the pivot axis is aligned with the working region in conventional pliers, then the structure is simple, but the force transmission ratio is suboptimal
Solution Approach 1:
The patent applies dimensionality change by offsetting the pivot axis from the longitudinal centerline of the pliers into a lateral dimension. The pivot axis is positioned laterally offset from the working region, creating an asymmetric geometry where the pivot axis does not align with the longitudinal axis of the pliers. This lateral displacement in a different dimension enables optimized lever arms and force transmission without adding structural complexity, as the offset is achieved through geometric arrangement rather than additional components.
2Force
If the pivot axis is offset laterally from the working region, then the force transmission ratio improves, but the alignment precision becomes more difficult
Solution Approach 1:
The patent employs asymmetry by deliberately designing the pliers with a non-symmetric pivot axis position. One pliers limb is formed in the shape of a U on the joint side, with the pivot axis passing through this U-limb laterally offset from the working region. This asymmetric configuration creates different lever arm lengths on either side of the pivot, optimizing the force transmission ratio. The asymmetric design is intentionally manufactured rather than being a precision alignment challenge, as the offset position is a design feature rather than a tolerance requirement.
3Productivity
If the U-limbs are made different in length, then the lever ratio is optimized, but the symmetry of the pliers is reduced
Solution Approach 1:
The patent applies asymmetry by making the two U-limbs different in length, with the pivot axis positioned in the shorter U-limb. This asymmetric configuration optimizes the lever ratio for cutting operations, as the different arm lengths create mechanical advantage. The reduction in symmetry is intentional and functional, transforming the pliers from a symmetric tool to an asymmetric one that exploits geometric asymmetry to enhance cutting efficiency and force transmission.
Solution Approach 2:
The patent applies local quality by differentiating the properties of the two U-limbs. The shorter U-limb contains the pivot axis and is optimized for providing the lever arm, while the longer U-limb extends further to accommodate the working region and cutting edges. Each U-limb is designed with specific local characteristics suited to its functional role, with the shorter limb optimized for rotational leverage and the longer limb optimized for reaching and applying the cutting edge to the workpiece.
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 design enhances the force transmission ratio and stability, allowing for more effective cutting and gripping by optimizing the arrangement of the pivot axis and working regions, resulting in improved performance during plier operations.
Implementation Method 1
the pliers limbs being pivotable relative to one another about a pivot axis formed in the joint
Implementation Method 2
one of the pliers limbs is formed in the shape of a U on the joint side and that the pivot axis passes through the U-limb... makes it possible for the pivot axis and the working region of the pliers limb in question to be arranged laterally offset relative to one another... advantageous lever ratios can be achieved
Data Source
AI summary
The invention relates to a pliers, in particular a center cutter, having two pliers limbs (6, 7) arranged to cross in a joint which forms a pivot axis (8), the two pliers limbs (6, 7) forming, on one side of the joint, interacting working regions (2, 3) that have free ends (15, 16), and the pliers limbs having gripping limbs (10, 11) on the other side of the joint. In order to improve a pliers of the kind specified at the beginning in such a way that an advantageous design structure is achieved for the greatest possible force transmission ratio, it is proposed that one of the pliers limbs (6) is formed in the shape of a U on the joint side and that the pivot axis (8) passes through the U-limb (12).