Pliers Jaw Tooth Geometry for Tilt-Free Sheet Gripping
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Solution Overview
Problem
Existing pliers designs, such as combination pliers, face challenges in securely gripping sheet-like workpieces without tilting due to the alignment and shape of toothed regions, which can lead to inadequate engagement and stability during gripping.
Innovation Solution
The design incorporates toothed regions where one set of tooth tips ends in a flat surrounding surface and the opposing set ends in a convex surface, allowing for secure gripping by ensuring the teeth run transverse to the longitudinal extent and enabling a tilt-free grip by distributing force components effectively across the workpiece.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional parallel toothed regions are used in pliers jaws, then the structure is simple and manufacturing is easy, but secure gripping of sheet-like workpieces cannot be achieved and tilting occurs during gripping
Solution Approach 1:
The patent applies asymmetry by configuring the first toothed region with a flat surrounding surface while the second toothed region has a convex surrounding surface. This asymmetric design creates different engagement characteristics: the flat surface provides stable contact for one set of teeth while the convex surface allows the opposing teeth to engage the workpiece from a different geometric relationship, preventing tilting moments during gripping operations
Solution Approach 2:
The patent applies local quality by giving different geometric properties to different parts of the toothed regions. Specifically, the first toothed region has a flat surrounding surface configuration while the second toothed region has a convex surrounding surface configuration. This local differentiation allows each toothed region to perform its specific gripping function optimally, with the flat surface providing stability and the convex surface providing engagement geometry that prevents workpiece tilting
2Force
If tooth tips are arranged to engage workpiece surfaces, then gripping force is applied, but tilting moments occur on workpieces with thickness due to force distribution
Solution Approach 1:
The patent applies the counterweight principle by creating opposing force components through the asymmetric toothed region configuration. The flat surrounding surface of the first toothed region and the convex surrounding surface of the second toothed region generate force components that counterbalance each other, preventing tilting moments on workpieces with thickness. The convex surface specifically creates a vertical force component that acts as a counterbalancing force to prevent workpiece rotation
Data Source
AI summary
Pliers have two pliers handles guided such that they cross one another in a joint region having a stationary joint bolt. Gripping regions are formed on the pliers handles on one side of the joint region, and working regions are formed on free ends of the pliers handles on the other side, said working regions extending to form a pliers jaw. The working regions have first and second toothed regions that come into contact when the pliers jaw is closed. In the first toothed region, in a sequence in the longitudinal extension of the pliers handle, the tooth tips end in a surrounding surface that is flat in the longitudinal section and in contact with same, and the tooth tips of the opposing second toothed region end in a surrounding surface that is convex in the longitudinal section and in contact with same.