Cutting Tool Head Jaw Coupling for Binding-Free Cuts
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Solution Overview
Problem
Hydraulic cutting tools often experience jaw binding and lateral flexing during cutting actions, leading to incomplete cuts and increased force on the jaws and blades, due to the overlap of cutting surfaces when in a closed position.
Innovation Solution
A cutting tool head design featuring a jaw coupling assembly with a hollow pin, press ring, and nut, along with integral blades and a blade guide system, which reduces the jaw gap and increases stiffness, preventing binding and flexing by ensuring proper alignment and distribution of force across the blades.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cutting surfaces overlap when jaws are in closed position, then the jaws can maintain structural integrity, but jaw binding and lateral flexing occur during cutting actions
Solution Approach 1:
A blade guide is introduced as an intermediary component between the jaws and blades. The blade guide includes a guide body with a guide surface that contacts the blade, ensuring proper alignment and preventing lateral movement during cutting. This mediator resolves the conflict by maintaining jaw structural integrity while eliminating binding and flexing through improved blade guidance and force distribution.
2Manufacturing precision
If the jaw gap is reduced to prevent binding, then cutting precision improves, but lateral flexing increases
Solution Approach 1:
The blade guide acts as a mediator that decouples the relationship between jaw gap size and cutting precision. By providing a dedicated guidance surface, the blade guide allows small jaw gaps for precision while the guide structure itself prevents lateral flexing, resolving the contradiction between precision and stability.
Solution Approach 2:
The solution moves the guidance function from the jaw-closing dimension to a separate guidance dimension provided by the blade guide. This dimensional separation allows independent optimization of jaw gap for precision while the guide structure handles lateral stability, resolving the contradiction.
3Power
If force is concentrated on the blades during cutting, then cutting effectiveness increases, but jaw binding occurs due to increased lateral force
Solution Approach 1:
The blade guide serves as a force-distributing intermediary. The guide surface contacts the blade and distributes cutting forces more evenly, preventing concentration of lateral forces that would cause jaw binding. This allows effective cutting force application while maintaining smooth jaw operation through improved force distribution.
Data Source
AI summary
Embodiments of the invention provide a cutting tool. The cutting tool includes a pin that defines an axis, a first jaw, a second jaw, a first blade, and a second blade. The first and second jaws are configured to rotate about the axis. The first jaw includes a first ear surface that has a first ear bore that is dimensioned to receive the pin. The second jaw includes a second ear surface rotationally engaged with the first ear surface and includes a second ear bore that is dimensioned to receive the pin. The blades can include a tapered face and a non-tapered face. The first and second ear surfaces can be coplanar with the respective non-tapered face.