Grinder Wheel Cover Detection and Motor Interlock
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Solution Overview
Problem
Grinders are often used without the wheel cover attached, posing safety risks and inefficiencies, as existing technologies lack effective mechanisms to ensure the cover is securely attached before operation.
Innovation Solution
A grinder design that incorporates a detector, such as a metal sensor or pressure sensor, to detect the presence of the wheel cover and prevent motor operation if it is not attached, using non-contact or contact detection methods to ensure the cover is securely in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a wheel cover is detachably attached to the housing, then ease of operation is improved (user can detach for processing work), but safety deteriorates (user may operate without cover attached)
Solution Approach 1:
The patent implements a detection mechanism that provides feedback about the wheel cover attachment state to the control system. The detector (metal sensor or pressure sensor) continuously monitors whether the wheel cover is properly attached, and this information is fed back to the controller to determine whether to permit motor operation. This feedback loop ensures that the system responds appropriately to the cover's attachment state, preventing operation when the cover is detached while allowing operation when it is attached.
Solution Approach 2:
The patent introduces an intermediary detection system between the wheel cover and the motor control. The detector (acting as an intermediary) senses the presence or absence of the wheel cover through magnetic fields (for metal sensors) or pressure changes (for pressure sensors), and transmits this information to the controller. This intermediary mechanism indirectly monitors the cover state without requiring direct mechanical interference with the cover itself, enabling safe operational control.
2Reliability
If a detector is added to detect the wheel cover, then safety is improved (operation prevented when cover detached), but device complexity worsens (additional components added)
Solution Approach 1:
The patent replaces complex mechanical detection mechanisms with simpler sensor-based systems. Instead of using mechanical switches, levers, or interlocks that would require physical contact and complex linkages, the invention employs metal sensors (detecting magnetic fields) or pressure sensors (detecting pressure changes) to sense the wheel cover's presence. This substitution of mechanical systems with field-based or pressure-based sensing reduces the number of moving parts and simplifies the overall device structure while maintaining effective detection capability.
Solution Approach 2:
The detector serves as an intermediary that indirectly senses the wheel cover state without requiring complex direct mechanical coupling. By using magnetic field detection (metal sensor) or pressure detection (pressure sensor), the system obtains cover attachment information through a simple intermediary mechanism rather than through complex mechanical linkages, thereby minimizing the added complexity.
3Device complexity
If non-contact detection is used, then device complexity is improved (fewer moving parts), but measurement precision worsens (detection accuracy may be affected)
Solution Approach 1:
The patent employs metal sensors that detect changes in magnetic field parameters (strength, distribution) caused by the presence or absence of the wheel cover. By monitoring parameter changes in the magnetic field rather than relying on direct physical contact, the system achieves accurate detection with minimal mechanical complexity. The control system interprets these parameter changes to determine cover attachment status reliably.
Solution Approach 2:
The patent substitutes mechanical contact-based detection with field-based detection using metal sensors or pressure sensors. This replacement eliminates the need for mechanical linkages, moving parts, or direct contact mechanisms, thereby reducing device complexity while maintaining detection accuracy through sensitive field or pressure measurement.
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
Prevents the grinder from being used without the wheel cover, enhancing safety and operational efficiency by ensuring the cover is attached before processing, thereby protecting users and maintaining tool effectiveness.
Implementation Method 1
the detector may include a magnet and a Hall sensor arranged to be spaced apart from each other along an attaching part of the housing to which the attaching portion of the wheel cover is attached
Implementation Method 2
the detector may include a pressure sensor provided at an attaching part of the housing to which the wheel cover is attached via the attaching portion
Data Source
AI summary
A grinder according to one aspect of the present disclosure includes a motor, a housing for housing the motor, a spindle protruding from the housing and configured to be driven to be rotated by the motor, a wheel cover configured to cover a part of a tip end tool attached to the spindle, a detector configured to detect the wheel cover, and a controller configured to stop or restrict the spindle being driven by the motor in response to non-detection of the wheel cover by the detector.