Power Tool Jaw Biasing Assembly for Jamming Return Forces
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Solution Overview
Problem
Conventional hydraulic tools face inefficiencies in biasing jaws from a closed position to an open position, particularly when cutting complex materials like tires, due to jamming forces.
Innovation Solution
The implementation of a return assembly with a biasing member, such as a spring or linkage, that applies a second force to aid the jaws in returning to the open position, overcoming external forces like jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If a single spring is used to bias the jaws to the open position, then the structure is simple, but the biasing force is insufficient to overcome jamming forces when cutting complex materials like tires
Solution Approach 1:
The biasing system is divided into two separate springs: a first spring positioned within the gap between the jaws that provides initial biasing force, and a second spring positioned external to the gap that provides additional biasing force. This segmentation allows each spring to contribute to the total biasing force, enabling the system to overcome jamming forces while maintaining a relatively simple structure.
Solution Approach 2:
The patent combines two spring mechanisms working together in a coordinated manner. The first spring and second spring both apply force to bias the jaws to the open position, creating a cumulative biasing effect that is greater than what a single spring could provide, thus resolving the force deficiency without requiring a complex mechanical advantage system.
2Productivity
If the first spring is positioned within the gap between the jaws, then it can effectively bias both jaws, but it may interfere with the cutting operation on complex materials
Solution Approach 1:
The second spring acts as an intermediary biasing mechanism that supplements the first spring's action. By positioning the second spring external to the gap, it provides additional biasing force without directly interfering with the cutting zone, thereby helping to prevent jamming forces while maintaining cutting efficiency.
Solution Approach 2:
The first spring is positioned to provide preliminary biasing force that keeps the jaws in the open position and ready for operation. This preliminary action ensures the jaws are pre-biased correctly before the cutting operation begins, improving readiness and efficiency while the second spring provides backup biasing to overcome any jamming that occurs during operation.
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 solution ensures smooth and efficient cutting processes by providing additional biasing force to return jaws to their open position, even when faced with jamming forces, thereby increasing tool efficiency.
Implementation Method 1
A first spring can be coupled to each of the first jaw and the second jaw to apply a first force to bias the first jaw and the second jaw to the first configuration
Data Source
AI summary
A power tool includes an actuator having a ram that is movable between a first position and a second position. A first jaw and a second jaw are moveable relative to one another between a first configuration when the ram is in the first position and a second configuration when the ram is in the second position. A first spring is coupled to each of the first jaw and the second jaw to apply a first force to bias the first jaw and the second jaw to the first configuration. A return assembly applies a second force to bias the first jaw to the first configuration.