Pipe Fitting Pressing Tool With Toggle Levers and Force Indication
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Solution Overview
Problem
Existing pressing tools for pipe connections are complex, costly, and difficult to operate, often requiring excessive force and manual return to initial position for each pressing stroke, making them unsuitable for small quantities or low purchasing power applications, and lacking clear indication of sufficient press force application.
Innovation Solution
A pressing tool with an actuator spindle, spindle nut, and toggle levers that allow for swiveling connections, enabling torque application through a hand crank or electric tool, allowing for complete pressing strokes without returning to initial position and providing clear indication of press force completion through geometry and spring mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex electrical pressing tools are used, then pressing force and reliability are improved, but acquisition costs and maintenance costs increase significantly
Solution Approach 1:
The patent replaces complex electrical pressing tools with a purely mechanical pressing device that uses a lever mechanism and spring element to generate and control pressing force. This mechanical system eliminates the need for electrical components, motors, and control systems, thereby reducing acquisition costs and maintenance requirements while maintaining reliable pressing functionality through well-established mechanical principles.
Solution Approach 2:
The pressing device incorporates a spring element that automatically returns the pressing jaws to the open position after pressing, eliminating the need for manual return operations. The mechanical design self-regulates the pressing cycle, reducing operational complexity and improving ease of use without requiring complex control systems.
2Device complexity
If pressing tools require manual return to initial position, then device complexity is reduced, but productivity decreases due to time loss
Solution Approach 1:
The pressing device uses a periodic action mechanism where the operator applies force in one direction to close the pressing jaws, and the spring element automatically provides the return action in the opposite direction. This periodic push-pull motion eliminates the need for separate manual return operations, maintaining mechanical simplicity while improving productivity by reducing the time required for each pressing cycle.
3Reliability
If excessive pressing force is applied, then connection reliability is improved, but fitting damage risk increases
Solution Approach 1:
The pressing device incorporates a spring element that acts as a cushioning mechanism, providing controlled resistance during the pressing operation. The spring gradually compresses as the pressing jaws close, absorbing excess force and preventing sudden or excessive pressing that could damage the fitting. This beforehand cushioning ensures reliable connection formation while protecting the fitting from damage.
Solution Approach 2:
The spring element changes the force parameter dynamically during the pressing cycle, providing increasing resistance as compression progresses. This parameter change allows the system to deliver sufficient initial force for reliable connection while automatically limiting maximum force to prevent fitting damage, thereby resolving the contradiction between connection reliability and fitting protection.
4Device complexity
If pressing completion indication is not provided, then device complexity is reduced, but measurement precision of pressing adequacy deteriorates
Solution Approach 1:
The pressing device incorporates a color-changing indicator that provides visual feedback on pressing completion. The indicator changes color when the pressing force reaches the appropriate level, allowing operators to quickly and accurately determine when pressing is complete without requiring complex measurement instruments. This simple visual indication system improves measurement precision while maintaining device simplicity.
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 enables simple, cost-effective, and reliable pressing of pipe connections with optimized force transfer, preventing damage to fittings and extending tool lifespan by ensuring only necessary force is applied, and allowing for easy detection of pressing completion.
Implementation Method 1
at least one spring element for automatically opening the pressing jaws after pressing
Implementation Method 2
an actuator spindle (26), a spindle nut (28) and at least two actuator levers (30, 32)
Implementation Method 3
allowing for torque application through a hand crank or electric tool
Implementation Method 4
each actuator lever (30, 32) is swivel connected at one end to the lever section (14, 16) of a pressing jaw and that each actuator lever (30, 32) is swivel connected at another end to the spindle nut (28)
Data Source
AI summary
A pressing tool for pressing fittings to produce pipe connections, with two opposing pressing jaws, each having a pressing section and a lever section, and having a retaining element for swivel connecting the pressing jaws, wherein the pressing sections form a receiving section and wherein pressing the lever sections apart causes the receiving section to close. An actuator spindle, a spindle nut and at least two actuator levers are provided, and each actuator lever is swivel connected at one end to the lever section of a pressing jaw and each actuator lever is swivel connected at another end to the spindle nut. A method for pressing fittings for the production of pipe connections is also disclosed.