Handheld Abrader Eccentric Torque Adjustment Mechanism
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Solution Overview
Problem
Conventional handheld abraders require multiple units with different torques for various grinding or polishing tasks, increasing costs and limiting applicability.
Innovation Solution
A handheld abrader design featuring an eccentric device with a transmitting sheath, shaft, and sleeve that allows adjustable torque by changing the position of the eccentric sleeve relative to the transmitting sheath, enabling the same device to perform both rough and fine grinding tasks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional handheld abraders use a fixed torque driving shaft, then the device can perform one type of grinding task effectively, but users need to purchase multiple devices with different torques for different grinding tasks, increasing cost and reducing versatility
Solution Approach 1:
The patent applies the dynamics principle by making the torque characteristic of the driving shaft adjustable rather than fixed. The eccentric device allows the user to change the torque output of the driving shaft dynamically, enabling a single handheld abrader to adapt to different grinding tasks (rough grinding requiring high torque, fine grinding requiring low torque) without needing multiple devices with fixed different torques.
Solution Approach 2:
The patent implements parameter changes by allowing the torque parameter of the driving shaft to be adjusted through the eccentric device. By changing the position of the eccentric sleeve relative to the transmitting sheath, the torque parameter can be modified to suit different grinding requirements, thus improving versatility while maintaining a single device configuration.
2Reliability
If users purchase multiple handheld abraders with different torques for different grinding tasks, then each device can be optimized for its specific task, but the cost of use increases significantly
Solution Approach 1:
The patent applies the universality principle by designing a single handheld abrader that can perform multiple grinding functions (both rough and fine grinding) through the adjustable torque feature provided by the eccentric device. This multi-functionality eliminates the need to purchase multiple specialized devices, thereby reducing the overall cost while maintaining reliable performance for each grinding task.
Solution Approach 2:
The dynamic adjustability of torque allows one device to replace multiple fixed-torque devices, achieving cost savings while maintaining the reliability needed for different grinding operations.
3Force
If the driving shaft has high torque for rough grinding, then rough grinding performance is improved, but fine grinding requires lower torque which cannot be achieved with the same fixed torque setting
Solution Approach 1:
The eccentric device enables the driving shaft to dynamically adjust its torque output. When positioned for rough grinding, the eccentric sleeve configuration provides high torque; when repositioned for fine grinding, it provides lower torque. This dynamic adjustment resolves the contradiction between needing high torque for rough grinding and low torque for fine grinding within a single device.
Solution Approach 2:
The torque parameter of the driving shaft is made changeable through the eccentric mechanism, allowing the same driving shaft to deliver different torque levels appropriate for different grinding tasks, thus achieving both high force capability and adaptability.
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
Enables the same handheld abrader to be used for different grinding tasks with adjustable torque, reducing the need for multiple devices and lowering operational costs while enhancing usability.
Implementation Method 1
The eccentric device is connected to the driving device and has a transmitting sheath, a transmitting shaft, and an eccentric sleeve. The eccentric sleeve is movably mounted around the transmitting sheath and has at least one positioning slice abutting against the transmitting sheath
Data Source
AI summary
A handheld abrader has a body, a driving device, an eccentric device, and a grinding tray. The body has a handle and a gun body. The driving device is mounted in the gun body and has a driving shaft. The eccentric device is connected to the driving device and has a transmitting sheath, a transmitting shaft, and an eccentric sleeve. The transmitting sheath is connected to the driving shaft and has two positioning recesses and a receiving chamber. The transmitting shaft has at least one engaging face. The eccentric sleeve is movably mounted around the transmitting sheath and has at least one positioning slice abutting against the transmitting sheath in one of the positioning recesses and an engaging ring mounted in the eccentric sleeve, mounted around the transmitting shaft, and having at least one pressing arm selectively pressed against the transmitting shaft at the at least one engaging face.