In-Line Hydraulic Cutter Jaw Assembly for Balanced Cutting Forces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Hand-held hydraulic cutting tools face challenges with asymmetric force application and stress distribution, leading to binding and bending issues due to hermaphroditic jaw designs, which affect the cutting performance and tool durability.
Innovation Solution
The design incorporates a clevis-and-tang or tongue-and-groove interlocking mechanism between jaw members, along with a spring member and locking pin, allowing for symmetrical force application and stress distribution, and features tapered jaw ends and weight reduction pockets for improved performance and lighter weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hermaphroditic jaw designs are used, then the tool can cut through various materials, but asymmetric force application causes binding and bending issues
Solution Approach 1:
The patent applies asymmetry by designing the jaw assembly with a symmetrical interlocking mechanism that counteracts the inherent asymmetry in cutting forces. The clevis and tang configuration creates balanced force distribution paths that compensate for the asymmetric nature of material cutting, preventing binding and bending while maintaining versatility across different materials.
Solution Approach 2:
The jaw assembly is segmented into distinct functional components (clevis, tang, jaw members) that can independently manage different aspects of force application. This segmentation allows each component to be optimized for its specific function while collectively achieving symmetrical force distribution, resolving the contradiction between versatility and stability.
2Strength
If traditional locking mechanisms are used, then the jaws can be held together for cutting, but the design adds weight and complexity
Solution Approach 1:
The interlocking mechanism is designed to be self-servicing, where the clevis and tang automatically engage and lock the jaw members in position through their geometric configuration. The spring member provides automatic tensioning to maintain the locked state without requiring additional actuators or complex control systems, thereby maintaining strength while reducing overall mechanism complexity.
Solution Approach 2:
The patent merges multiple functions into the interlocking mechanism itself - the clevis and tang simultaneously provide structural support, force distribution, and locking functionality. This consolidation eliminates the need for separate locking components, reducing device complexity while maintaining the required jaw holding force for effective cutting.
3Device complexity
If traditional jaw designs are used, then the structure is simple, but stress distribution is uneven causing binding and bending
Solution Approach 1:
The patent applies local quality by strategically positioning the interlocking mechanism at specific locations within the jaw assembly where force distribution is most critical. The clevis and tang are configured to create localized stress distribution zones that balance the overall force application, preventing binding and bending while maintaining relatively simple overall jaw structure.
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 configuration enhances the cutting tool's performance by ensuring symmetrical force application, reducing stress on the jaws, and achieving a lighter weight design while maintaining strength, thus improving cutting efficiency and tool durability.
Implementation Method 1
The spring member includes a first end attached to the proximal end portion of the first jaw member and a second end attached to the proximal end portion of the second jaw member. The spring member normally biasing the proximal end portion of the first jaw member and the proximal end portion of the second jaw member toward each other such that the first and second cutting blades are in an open position.
Data Source
AI summary
A portable, hand held hydraulic cutting tool having an in-line handle assembly and a working head assembly. The handle assembly has a tool frame portion and a neck portion. The working head assembly has a pair of jaw members joined so that they are movable relative to each other and held in place by a locking pin. Each jaw member has a cutting blade attached thereto. Each jaw member can be tapered and can include weight reducing pockets defined in respective sidewalls. Each jaw member includes a raised tab on an outside edge that mates with a respective tab notch in a yoke of the neck portion of the handle assembly. When the locking pin is in an extended position, the jaw members of the tool can separate and rotate away from one another until their respective locking tabs engage their respective locking tab opening, connecting the jaw members to the yoke of the neck portion of the handle assembly.