Lever Key Blank Stacking Formations for Jam-Free Handling
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Solution Overview
Problem
Lever key blanks tend to incline and jam when stacked due to their cylindrical profile, causing handling difficulties in key cutting machines.
Innovation Solution
Incorporating non-rectangular shank cross-sections with parallel engagement surfaces on the lever key blanks, such as on the collar or head, to maintain alignment and prevent jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If lever key blanks have a cylindrical shank profile, then the shank provides smooth rotational support and strength, but the blanks tend to incline and slide past one another when stacked
Solution Approach 1:
The shank cross-section is changed from circular to non-circular (rectangular, square, or polygonal), creating an asymmetric shape that prevents rotation and sliding when stacked. This asymmetric geometry allows the blanks to stack vertically without inclining, while still providing sufficient strength for lock operation.
Solution Approach 2:
The invention adds a new dimension to the stacking stability problem by introducing engagement surfaces that extend beyond the collar in the vertical direction. These surfaces create mechanical interlocking between stacked blanks, transforming the stacking behavior from unstable sliding to stable vertical alignment.
2Stability of the object's composition
If lever key blanks have a cylindrical collar, then the collar provides a stable abutment surface, but the blanks still jam in magazines and cartridges when stacked
Solution Approach 1:
The collar cross-section is changed from circular to non-circular, creating an asymmetric shape with engagement surfaces that extend beyond the collar. This prevents the blanks from rotating or sliding when stacked in magazines, eliminating jamming while maintaining the abutment function.
Solution Approach 2:
The engagement surfaces act as an intermediary mechanical feature between the collar and the stacking blanks. These surfaces extend beyond the collar to create a bridging structure that prevents direct contact and sliding between adjacent blanks, thereby preventing jamming while preserving the collar's abutment function.
3Quantity of substance
If lever key blanks are stacked in a magazine, then multiple blanks are available for cutting, but the blanks become jammed due to inclined stacking
Solution Approach 1:
The non-circular shank and collar cross-sections create asymmetric engagement surfaces that force the blanks to stack vertically in a fixed orientation. This prevents inclining and jamming in the magazine, allowing all blanks to be readily accessible for cutting operations and maintaining high productivity.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
A lever key blank 10 including stacking formations which define a spaced pair of parallel engagement surfaces 30. The parallel engagement surfaces 30 extend beyond or at least as far as the remainder of lever key blank 10 in a direction perpendicular to the surfaces 30.