Cordless Screwdriver Hydraulic Riveting Tool Without Air Lines
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Solution Overview
Problem
Existing hydraulic tools for driving pulling and/or pressing devices, such as riveting tools, are complex and expensive to manufacture, requiring a compressed air connection and having a cumbersome configuration.
Innovation Solution
A compact and cost-effective hydraulic tool that can be mounted on a cordless screwdriver, utilizing a hydraulic pump driven by the screwdriver's drive shaft to generate high pressures through a power piston with a large surface area, allowing for high pulling and pressure forces, and featuring a modular design with interchangeable tool attachments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a pneumatic/hydraulic pump is used to generate high pressures in a handheld device, then high pressures can be achieved with small installation space, but the tool configuration becomes very complex and expensive to manufacture
Solution Approach 1:
The patent uses a hydraulic pump driven by the screwdriver's motor to generate high pressures (up to 500 bar) through a power piston with large surface area, eliminating the need for complex pneumatic systems while achieving the required pressing and pulling forces
Solution Approach 2:
The hydraulic tool is designed as a multi-functional attachment that can perform riveting, punching, and pressing operations using a single compact hydraulic system, reducing overall device complexity while maintaining versatility
2Power
If a pneumatic/hydraulic pump is used to generate high pressures, then high-performance handheld device can be provided, but compressed air connection is required to operate the tool
Solution Approach 1:
The hydraulic pump is directly driven by the screwdriver's motor, allowing the tool to be self-contained and portable without requiring external compressed air connections or additional power sources during operation
Solution Approach 2:
The patent combines the hydraulic power generation system with the screwdriver's existing motor, merging two functions into one integrated tool that eliminates the need for separate compressed air supplies
3Ease of manufacture
If a screwdriver is used to drive the hydraulic pump, then the tool can be mounted to commercially available inexpensive screwdrivers, but high pressures and pulling forces must be generated with comparatively small electric tool
Solution Approach 1:
The patent employs a hydraulic power piston with surface area at least 20 times (preferably 50-100 times) larger than the pump piston, creating mechanical advantage that allows small screwdrivers to generate high pressing and pulling forces (over 10,000 N, preferably over 50,000 N) through hydraulic pressure amplification
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 hydraulic tool achieves high pressures and forces with a compact design, eliminating the need for a compressed air connection and reducing manufacturing complexity, while allowing for versatile use in setting rivets and punching applications with a user-friendly interface.
Implementation Method 1
The power piston has a larger surface area on which pressure is applied than the pump piston. More particularly, the power piston's surface area on which hydraulic fluid can be applied is at least twenty, preferably fifty, preferably up to 100 times as large as that of the pump piston
Implementation Method 2
With such a high hydraulic transmission ratio, high pressures and hence correspondingly high pulling and pressure forces can be generated in this way in the operating chamber of the power piston
Data Source
AI summary
Hydraulic tool for driving a pulling and/or pressing device, comprising a drive shaft that can be mounted to a screwdriver, wherein the drive shaft is operable to drive a hydraulic pump that pumps hydraulic fluid into the operating chamber of a hydraulic power piston. The hydraulic tool may in particular be configured as a riveting or punching attachment for a cordless screwdriver.