Pull-Cord Roller Disk Grater for High-Torque Manual Cutting
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Solution Overview
Problem
Manually operated disc mincers with crank drives face limitations in torque and rotational speed, resulting in poor performance with hard or fibrous materials, often leading to incomplete cutting or blockage.
Innovation Solution
A manually operated appliance with a pull-cord roller and spiral spring mechanism that reduces tilting risk, featuring a drive wheel with external toothing engaging internal toothing of a cutting disc, allowing for improved force transmission and cutting efficiency, along with a safety device for user protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a crank drive is used in manually operated disc mincers, then the device can be operated manually, but the cutting disc can only be driven with low torque and low rotational speeds, resulting in poor performance with hard or fibrous materials
Solution Approach 1:
The pull cord is pulled in advance to wind up the spiral spring, storing elastic energy before operation. When released, this pre-stored energy drives the cutting disc with high torque and rotational speed, overcoming the limitation of direct manual cranking.
Solution Approach 2:
The spiral spring releases its stored energy in a periodic manner, converting the gradual winding action into a rapid rotational motion of the cutting disc. This periodic energy release enables high-speed cutting action that would be impossible with continuous manual cranking.
2Length of stationary object
If the spring element is arranged inside the pull-cord roller with a concentric recess, then the overall height of the appliance is reduced, but the space for spring element placement is constrained
Solution Approach 1:
The spiral spring element is nested inside the pull-cord roller, with the spring coils contained within the concentric recess of the roller structure. This nesting arrangement allows the spring to be housed within the existing roller geometry, minimizing overall height without requiring additional external space.
Solution Approach 2:
Instead of extending the spring element vertically (increasing height), the design utilizes the radial and axial dimensions of the pull-cord roller by creating a concentric recess. This dimensional redistribution accommodates the spring within the roller's internal volume, reducing overall appliance height.
3Force
If the pull-cord roller is arranged parallel to and at a distance from the central axis, then the maximum transmission of force to the working unit is achieved, but the distance from the central axis increases
Solution Approach 1:
The pull-cord roller acts as an intermediary element positioned at an optimized distance from the central axis. This intermediate position allows the spring force to be transmitted effectively to the cutting disc through the roller's rotation, maximizing torque transmission while maintaining a compact overall structure.
Solution Approach 2:
The position of the pull-cord roller is optimized by adjusting its distance from the central axis. This parameter change maximizes the lever arm for force transmission while keeping the appliance compact. The specific distance is chosen to achieve optimal balance between force transmission efficiency and overall device dimensions.
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 appliance achieves enhanced cutting performance with reduced component count, improved force transmission, and user safety through efficient operation and secure mounting of the cutting disc, effectively handling hard or fibrous materials without blockage.
Implementation Method 1
The spring element, preferably a spiral spring, is connected to the pull-cord roller in such a way that when the drive is actuated in a first direction of rotation, therefore when there is a pull on the pull cord, the spring element is preloaded and, after the pull cord has been released, the spring element expands again and in the process rotates the pull-cord roller in the opposite direction.
Data Source
AI summary
An appliance (100) for processing foodstuffs with a drive (2) including a pull-cord roller (21) having a concentric recess (22), in which there is arranged a spring element (23) located on the inside, the spring element (23) being operatively connected to the pull-cord roller. Through the drive (2), the working unit (4), which can be made to rotate, is driven, the working unit (4) being arranged in such a way that the external toothing (62) of the drive wheel (61) engages in the internal toothing (63) of the working unit (4) and, when the drive (2) is actuated, the working unit (4) is made to rotate. A locking element (10), which is equipped to lock the drive (2) in a non-operational state, and an unlocking element (11), which is equipped to actuate the locking element (10) in order to release the locking, contribute to the high operational safety of the appliance.