Dual-Action Hydraulic Piston Assembly for Faster Cable Cutting
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Solution Overview
Problem
Existing long reach cable cutting tools are mechanically actuated, slow, and ergonomically challenging, particularly when cutting larger diameter cables, necessitating a more versatile and ergonomic solution for safely cutting live electrical cables.
Innovation Solution
A battery-powered hydraulic tool with a dual action hydraulic piston assembly, featuring a handle, motor, trigger, and a hydraulic actuating system, which includes a dual action hydraulic piston assembly with inner and outer rams, allowing for rapid and controlled fluid displacement to enhance cutting capacity and ergonomics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If manually actuated mechanical tools are used for cable cutting, then the tool structure is simple, but the actuation speed is slow and ergonomics are poor
Solution Approach 1:
The patent applies hydraulic principles by using a battery-powered motor to drive a hydraulic pump, which generates hydraulic pressure to actuate the cutting mechanism. This hydraulic system enables rapid actuation (cutting capacity in approximately seven seconds) while maintaining ergonomic operation, resolving the contradiction between speed and complexity by using fluid power transmission instead of direct mechanical actuation
Solution Approach 2:
The patent replaces the traditional manual mechanical actuation system with an electrically-powered hydraulic system. The battery-powered motor substitutes for manual mechanical input, and the hydraulic pump-substitute mechanism provides automated, rapid actuation, thereby increasing speed while the integrated design keeps complexity manageable
2Force
If mechanically actuated tools are used, then the device is simple to operate, but the cutting capacity for large diameter cables is insufficient
Solution Approach 1:
The hydraulic system generates high cutting force through hydraulic pressure multiplication. The battery-powered motor drives the hydraulic pump to create sufficient hydraulic pressure to cut large diameter cables (greater than 556 ACSR), providing the necessary force while the hydraulic mechanism manages the complexity of force transmission
Solution Approach 2:
The system changes the operational parameters by using hydraulic pressure to achieve higher cutting forces. The battery-powered hydraulic system can generate sufficient force to cut cables exceeding 556 ACSR, representing a parameter change from manual mechanical force limits to hydraulic force multiplication
3Loss of time
If manual actuation is used, then the tool is easy to control, but the actuation time is excessive
Solution Approach 1:
The patent substitutes battery-powered electric actuation for manual mechanical actuation. The motor-driven hydraulic system achieves cutting capacity in approximately seven seconds, dramatically reducing actuation time while the trigger mechanism and ergonomic handle design maintain ease of operation and user control
4Productivity
If existing long reach cable cutting tools are used, then the tool can reach high voltage cables, but the tool is slow and ergonomically challenging
Solution Approach 1:
The hydraulic system provides rapid actuation (cutting in approximately seven seconds) while the ergonomic handle design with trigger actuation maintains ease of operation. This resolves the contradiction between productivity and ergonomics by using hydraulic power transmission combined with user-friendly control mechanisms
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
The tool provides a quicker tool stroke and greater cutting capacity, achieving actuation in approximately seven seconds, significantly faster than prior art tools, while ensuring ergonomic operation and safety during cable cutting.
Implementation Method 1
a motor positioned within the handle and electrically connectable to a battery
Implementation Method 2
the pump is activated to displace a first fluid
Implementation Method 3
an inner ram having an inner cavity slidably mated with an outer surface of the conduit, an outer ram having an inner surface slidably mated with an outer surface of the inner ram
Data Source
AI summary
A dual action hydraulic piston assembly including a cylinder having first and second inlet ports on a first end and an outlet port on a second end, a conduit connected to the first inlet port and extending into the cylinder, an inner ram slidable along an outer surface of the conduit, and an outer ram slidable between the inner ram and the cylinder. The inner and outer rams are configured to move together toward the second end of the cylinder in response to a fluid being displaced via the first inlet port into the conduit, which displaces a second fluid through the outlet port at a first flow rate. The outer ram is configured to move toward the second end of the cylinder in response to a fluid being displaced via the second inlet port, which displaces the second fluid through the outlet port at a second flow rate.