Motor-Driven Pressing Tool for Consistent PEX Ring Crimping
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Solution Overview
Problem
Manual pressing tools for attaching cross-linked polyethylene (PEX) tubing to fittings using compression rings are inefficient and lack the precision and power needed for consistent clamping or crimping, particularly in tight spaces.
Innovation Solution
A powered pressing tool with a housing, pivotal jaws, a motor-driven output shaft, and a roller carriage in direct threaded engagement, allowing for controlled compression of clamp or crimp rings, and featuring a battery-powered design with a microcontroller for automated operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual pressing tools are used for clamping or crimping PEX tubing, then the tool structure remains simple, but the precision and consistency of clamping force are insufficient
Solution Approach 1:
The patent replaces the manual mechanical operation with an automated motor-driven system. A motor rotates a threaded output shaft that advances a roller carriage, which then actuates the jaws through cam surfaces. This substitution of manual mechanical operation with automated motor control provides consistent, repeatable clamping force while maintaining reasonable structural complexity through modular design.
Solution Approach 2:
The patent incorporates a microcontroller that can control motor operation parameters such as rotation speed, torque, and duration. This allows precise control of the clamping force application profile, ensuring consistent results. The ability to adjust and control these parameters electronically provides manufacturing precision while the control system manages the complexity.
2Power
If powered pressing tools with motor and transmission are added, then the power and precision improve, but the device complexity increases
Solution Approach 1:
The patent uses a motor-driven threaded shaft mechanism to generate and control clamping power. The motor provides rotational force that is converted to linear motion of the roller carriage through thread engagement, eliminating the need for manual leverage while providing controlled, high-power clamping capability.
Solution Approach 2:
The patent employs dynamic elements including the rotating roller carriage that moves along the threaded shaft, and cam surfaces that convert the linear motion into jaw actuation. The system transitions from static manual positioning to dynamic motor-controlled motion, providing adaptive power delivery that responds to the clamping requirements.
3Ease of operation
If the tool is designed for tight spaces, then the usability improves, but the housing size constraints make component arrangement difficult
Solution Approach 1:
The patent places the transmission mechanism within the handle portion of the housing, nesting components within available spaces. The motor, threaded shaft, and roller carriage are arranged in a compact sequence that fits within the constrained housing volume while maintaining the functional requirements for tight space operation.
Solution Approach 2:
The patent utilizes the longitudinal axis of the handle portion for the output shaft extension, arranging components along the length of the tool rather than spreading them laterally. This dimensional arrangement allows the mechanism to fit within the constrained cross-sectional dimensions while maintaining adequate component spacing along the tool's length.
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 efficient, precise, and consistent clamping or crimping of PEX tubing to fittings, improving usability in tight spaces and reducing manual effort, while maintaining a compact and reliable design.
Implementation Method 1
a roller carriage in direct threaded engagement with the output shaft such that rotation of the output shaft advances or retracts the roller carriage to pivot the jaws
Implementation Method 2
a motor supported within the housing, an output shaft driven by the motor
Implementation Method 3
a compression ring can be slid over the PEX tubing and fitting, then compressed using a pressing tool to clamp the PEX tubing to the fitting
Data Source
Figure 1A~1B
Figure 2A~2C
Figure 3
AI summary
A pressing tool (50) includes a housing (54), first and second jaws (170) at least partially disposed in the housing, the first and second jaws being pivotal respective to a portion of the housing, a motor (106) supported within the housing, an output shaft (114) driven by the motor, the output shaft including a threaded portion (150), and a roller carriage (190) including a threaded bore (194) in which the output shaft is received such that rotation of the output shaft advances or retracts the roller carriage to pivot the jaws.