Spice Grinder Threaded Locking Ramps for Secure Refill Control
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Solution Overview
Problem
Conventional 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 and a second rotatable component with interlocking protrusions, preventing rotation in the direction that would unscrew the first component from the bottle, utilizing a multi-start thread and equidistantly spaced protrusions for secure attachment and grinding functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixed component is secured to the bottle using a snap-on mechanism with intermeshing protrusions, then the fixed component prevents rotation and removal, but excessive force is required for detachment and damage may result
Solution Approach 1:
The attachment mechanism is divided into two functional parts: a screw thread for secure attachment and a bead-groove mechanism for preventing rotation and accidental removal. This segmentation allows the screw mechanism to provide controlled, reversible attachment while the bead provides rotational constraint without requiring excessive force for detachment.
Solution Approach 2:
The attachment system transitions from a static snap-fit mechanism to a dynamic screw-threaded mechanism that allows controlled rotation and detachment. The screw thread enables the fixed component to be securely attached yet easily removed by applying torque in the opposite direction, eliminating the need for excessive prying force.
2Reliability
If the fixed component is made non-rotatable using intermeshing protrusions, then the component remains securely attached, but the grinder cannot be refilled
Solution Approach 1:
The screw-threaded attachment mechanism provides dynamic controllability, allowing the fixed component to be attached securely during normal use yet easily detached when refilling is required. The anti-rotation bead prevents accidental loosening during grinding while permitting intentional removal by unscrewing, thus maintaining both security and refillability.
3Reliability
If the fixed component is pressed onto the bottle with snap-fit protrusions, then the component is securely attached, but damage results if excessive force is applied to remove it
Solution Approach 1:
The screw-threaded mechanism replaces the static snap-fit with a dynamic attachment system that distributes attachment forces evenly along the threaded interface. This eliminates stress concentration points that occur with snap-fit protrusions, preventing structural damage during both attachment and detachment operations.
Solution Approach 2:
The screw thread acts as an intermediary mechanism between the fixed component and the bottle, providing a controlled interface for attachment and detachment. This intermediary allows force to be applied gradually through rotation rather than sudden impact, protecting the structural integrity of both components.
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.