Safety cover
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Solution Overview
Problem
Meat grinders lack effective protection to prevent operators' hands or fingers from entering the grinding head, risking injury from the auger and cutting knife.
Innovation Solution
A safety cover attachment for meat grinders that can be clamped onto the grinding head, featuring a normally closed design that opens with a linear force applied to a slide plunger pin, allowing access to the inlet throat and automatically returning to the closed position when the force is removed, utilizing a combination of torsion and return springs for spring biasing and a friction screw for secure locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the inlet throat is kept open for loading meat, then the ease of operation is improved, but the safety is worsened due to risk of hand injury from auger and cutting knife
Solution Approach 1:
The safety cover is designed as a movable protective barrier that can dynamically transition between closed (safety) and open (loading) positions. The cover is mounted on the inlet throat and can be manually opened during loading, then automatically or manually closed during operation, providing adaptive protection based on operational phase.
Solution Approach 2:
The safety cover is installed on the inlet throat before operation begins, establishing a preliminary protective barrier. The cover remains in the closed position during idle periods and automatically engages protection before the auger and cutting knife become hazardous, preventing hand injury risk before it can materialize.
2Object-affected harmful factors
If a fixed closed cover is used to protect the inlet throat, then the safety is improved, but the ease of operation is worsened due to difficulty in accessing the inlet throat
Solution Approach 1:
The safety cover transitions from a static fixed barrier to a dynamic movable component. The cover can be manually opened by applying force to overcome the spring bias, allowing easy access during loading, then automatically closes to provide protection during operation, resolving the contradiction between safety and accessibility.
Solution Approach 2:
The safety cover incorporates a spring mechanism that automatically returns the cover to the closed protective position after being opened for loading. This self-returning feature eliminates the need for separate manual closing actions, making the system both safe and easy to operate with minimal user intervention.
3Ease of operation
If a spring-loaded automatic return mechanism is used, then the ease of operation is improved, but the device complexity is worsened due to additional springs and plunger components
Solution Approach 1:
The safety cover system is segmented into distinct functional components: the cover body, the plunger mechanism, and the spring assembly. This segmentation allows each component to perform its specific function independently while simplifying the overall design - the plunger handles opening activation, the spring handles automatic return, and the cover provides protection, reducing complexity through functional separation.
Solution Approach 2:
The plunger acts as an intermediary mechanism between user input (manual opening force) and the cover movement. The plunger translates linear pressing motion into rotational cover opening, while the spring acts as an intermediary energy storage element that automatically returns the cover to closed position, simplifying the control mechanism while enabling automatic operation.
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 safety cover effectively prevents accidental entry of hands or fingers into the grinder head, providing a secure and user-friendly mechanism for accessing the inlet throat while ensuring the cover returns to a closed position when not in use, enhancing operational safety.
Implementation Method 1
a torsion spring attached to the slide covers and a return spring in the slide plunger pin then return the safety cover to its normally closed position
Implementation Method 2
a torsion spring attached to the slide covers and a return spring in the slide plunger pin then return the safety cover to its normally closed position
Implementation Method 3
utilizing a combination of torsion and return springs for spring biasing and a friction screw for secure locking
Data Source
AI summary
A meat grinder safety cover attachment for a meat grinder grinding head that prevents an operator of the meat grinder from entering hand or fingers into the inlet throat of the grinder where a turning auger starts the grinding of meat. The grinder safety cover has two functional states: a normally closed state and an actuated open state. Moving from the normally closed state to the actuated open state is initiated by applying a linear force by depressing a slide plunger pin that engages the slide covers covering the grinder head inlet throat. The slide plunger pin and slide covers are configured to convert the linear motion of the slide plunger pin to rotational motion of the slide covers, opening the slide covers and uncovering the inlet throat of the grinder head. Removing the depression force on the slide plunger pin, the torsion spring attached to the slide covers and a return spring in the slide plunger pin then return the safety cover to its normally closed position.