Spice Grinder Ramp Locking to Prevent Unscrewing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing spice grinders are often non-refillable due to design features that require excessive force for component detachment, leading to potential damage and inefficiency in spice grinding.
Innovation Solution
A spice grinder design featuring a first component with an internal screw thread compatible with the bottle's external thread, and a second rotatable component with co-operating grinding teeth, utilizing ramps with camming surfaces to prevent unscrewing and ensure secure attachment, allowing for efficient grinding without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixed component is pressed onto the bottle with a snap-on cap and bead-groove mechanism, then the fixed component is prevented from rotating and being removed, but excessive force is required for detachment and damage may result
Solution Approach 1:
The locking mechanism is segmented into multiple independent ramps distributed around the circumference. Each ramp provides a portion of the locking action, distributing the force requirements and allowing controlled detachment when sufficient force is applied in the unscrewing direction.
Solution Approach 2:
The ramp mechanism transforms the static snap-fit connection into a dynamic locking system where the camming surfaces interact during the screwing motion to automatically engage the locking surfaces, providing progressive locking as the component is tightened.
2Reliability
If the fixed component is screwed tightly onto the bottle, then secure attachment is achieved, but the component can be unscrewed and the grinder becomes refillable
Solution Approach 1:
The locking surfaces are positioned to engage before the threading can be completely disengaged. As the component is screwed on, the ramps cause the locking surfaces to contact and prevent unscrewing before the threads fully engage, creating a preliminary lock that maintains the non-refillable property.
Solution Approach 2:
The ramp mechanism performs the locking action preliminarily during the screwing process itself. As the fixed component is screwed onto the bottle, the camming surfaces ride over each other and automatically engage the locking surfaces, establishing the locked state before the connection is complete.
3Reliability
If multiple ramps are provided spaced equidistantly around the component, then the locking is more secure and distribution of force is improved, but the device complexity increases
Solution Approach 1:
Each ramp is designed with specific local geometry including camming and locking surfaces tailored to its position. The ramps are spaced equidistantly to distribute locking forces uniformly around the circumference, with each ramp providing localized locking action that collectively secures the connection.
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 design enables secure attachment and efficient grinding of spices without the need for excessive force, preventing damage and ensuring easy assembly and disassembly while maintaining the non-refillable nature of the grinder.
Implementation Method 1
there being a first ramp on the inside surface of the first component and a second ramp on the external surface of the bottle, each ramp having a camming surface which intersects with a locking surface, the camming surface of the first ramp encountering and riding over the camming surface of the second ramp as the fixed component is screwed onto the bottle
Data Source
AI summary
A spice grinder comprising a bottle (60) and a grinder unit (10) which is screwed onto the bottle. The grinder unit comprises a fixed component (12) and a rotatable component (14). The components have teeth (28, 44) which face one another across a grinding gap (52). The component (12) has one or more ramps (54) on the inside thereof and the bottle (60) has one or more external ramps (66). Each ramp (54) comprises a camming surface (56) and a locking surface (58) which intersect. The ramp (66) also comprises a camming surface (68) and a locking surface (70). When the grinder unit (10) is screwed onto the bottle the ramps (54, 66) ride over one another until the surfaces (56, 70) clear one another and the surfaces (58, 70) snap into face-to-face contact to prevent the grinder unit being rotated in the direction which unscrews it from the bottle.