Stepped Door Stop With Progressive Indexing Rod
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Solution Overview
Problem
Existing door stop solutions often require high manufacturing accuracy and complexity, leading to increased production and mounting difficulties, while also being sensitive to environmental factors like wind and air streams, which can affect door positioning.
Innovation Solution
A stepped door stop with a progressive indexing rod, self-lubricating thermoplastic slide, and metallic insert, featuring variable stiffness springs and indexing balls, along with adjustable fastening parts for secure and reliable operation, allowing for standardized components and reduced maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional door stop mechanisms are used with simple construction, then manufacturing cost is reduced, but manufacturing precision and reliability deteriorate due to sensitivity to environmental factors like wind and air streams
Solution Approach 1:
The door stop mechanism is segmented into multiple independent components: a retention body, a rod with multiple indexing positions, multiple balls for engagement, and multiple springs. This segmentation allows each component to be manufactured separately with standardized processes, reducing overall manufacturing complexity while the coordinated action of multiple balls and springs provides stable positioning that resists environmental disturbances
Solution Approach 2:
Multiple functional elements are merged into a single integrated rod component that combines multiple indexing positions, engagement surfaces, and positioning features. This merging reduces the total number of parts needed while maintaining reliable multi-position door stopping functionality that is resistant to wind and air stream effects
2Reliability
If high manufacturing accuracy is required for door stop components, then door positioning reliability is improved, but device complexity and production difficulty increase
Solution Approach 1:
The rod is designed with different local geometries: cylindrical sections for ball engagement, conical sections for spring interaction, and specific indexing position features. Each local region has optimized dimensions and tolerances appropriate to its function, allowing standard manufacturing processes to achieve the required positioning accuracy without requiring high precision across the entire component
Solution Approach 2:
The mechanism uses variable stiffness springs with different force characteristics and balls of varying sizes to achieve reliable door positioning across multiple angles. By changing physical parameters like spring constant, ball diameter, and rod geometry at different positions, the system achieves accurate positioning without requiring uniformly high manufacturing precision throughout
3Ease of manufacture
If standardized components are used to reduce production complexity, then ease of manufacture is improved, but adaptability to different door configurations deteriorates
Solution Approach 1:
The rod is designed as a universal component with multiple indexing positions and engagement features that can accommodate different door weights, sizes, and desired stopping angles. The same basic rod structure with standardized balls and springs can be adapted to various door configurations by selecting different indexing positions or adjusting spring preloads, providing both manufacturing simplicity and configuration flexibility
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 solution provides stable and comfortable door operation with reduced risk from environmental influences, using standardized parts and offering versatility across various industries, including automotive, naval, and household applications.
Implementation Method 1
two compression springs, which may have a variable progressive stiffness
Implementation Method 2
self-lubricating thermoplastic slide
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The stepped door stop, as claimed by the present invention, comprise a progressive indexing rod (1) provided with a hole (a) at one end for fixing with a rivet (3) and at the other end with a bumping section (t) that is T-shaped in a horizontal plane, the progressive indexing rod being provided on two opposite faces with a channel (c) having a recess (b) for positioning during mounting, recesses (d1, d2,...,dn) for indexing during operation, a slide (2) with a relatively parallelepipedic shape, provided with an opening (f1), slots (f2) placed symmetrically towards the edges, a longitudinal cylindrical channel perpendicular to the axis of the opening (f1), said slide (2) also incorporating two heads of screws (10a) and (10b) that are positioned symmetrically for fixing to the door, two balls (4a) and (4b) for indexing, two compression springs (6a) and (6b) with progressive stiffness, two caps (8a) and (8b) provided with slots (8f) and (8f"), two U-shaped safety locks (7a) and (7b) and a fastening part (9) with an ovalized hole (o) for fixing with screws on the pillar, the progressive indexing rod (1) having a symmetric design, with progressive steps towards the bumping section (t), on two opposite sides, defining plane-parallel surfaces (s1), (s2) and (s3) containing channel (c) common to the surfaces and wherein the positioning recess (b) and indexing recesses (d1, d2, ..., dn) having a spherical or conical shape are machined.