Angle-Adjustable Stair Railing Post Assembly
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Solution Overview
Problem
Existing stair handrail systems require high skill and expertise to assemble, particularly in ensuring that handrail posts remain perpendicular to the ground across various stair incline angles.
Innovation Solution
An angle-adjustable post assembly featuring a hollow rectangular tube post portion, a cylindrical pivot rod for adjustment, and a base portion with fastener holes, allowing for easy assembly and adjustment to accommodate multiple incline angles without custom welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional fixed-angle post assemblies are used, then manufacturing precision for perpendicular alignment is improved, but adaptability to multiple incline angles deteriorates
Solution Approach 1:
The post assembly incorporates a pivot mechanism that allows the post to rotate and adjust to different incline angles. The pivot rod with arcuate slots and adjustment holes enables dynamic repositioning of the post while maintaining perpendicular alignment through gravity and mechanical constraints, resolving the contradiction between fixed precision and flexible adaptability.
Solution Approach 2:
The design changes the adjustable parameter from fixed manufacturing angles to a continuous range of angles via the pivot mechanism. The arcuate slots and multiple adjustment holes provide discrete angular positions, allowing the same assembly to be manufactured with high precision but installed at various incline angles by changing the pivot angle parameter.
2Adaptability or versatility
If custom welding is performed at each site for different angles, then adaptability to various incline angles is improved, but ease of manufacture deteriorates
Solution Approach 1:
The post assembly is segmented into distinct components: base portion, post portion, and pivot rod. This segmentation allows each component to be manufactured independently with standard processes, then assembled using simple mechanical connections (bolts through adjustment holes) rather than custom welding, making the system both adaptable and easy to manufacture.
Solution Approach 2:
The pivot rod acts as an intermediary mechanism between the base and post portions. It provides the angular adjustment function without requiring welding, using instead a mechanical intermediary structure with arcuate slots and adjustment holes that enables angle changes through simple bolt repositioning.
3Manufacturing precision
If high skill and expertise are required for assembly, then manufacturing precision is improved, but ease of operation deteriorates
Solution Approach 1:
The post assembly incorporates self-aligning features where the pivot mechanism automatically positions the post perpendicular to the ground through gravity and geometric constraints. The arcuate slots and adjustment holes provide visual and mechanical guidance for alignment, reducing the need for skilled operators while maintaining precision.
Solution Approach 2:
The base portion and post portion are pre-configured with alignment features (arcuate slots, adjustment holes) that guide the assembly process. The preliminary design of these features ensures that correct alignment is achieved through the mechanical structure itself rather than requiring operator skill, making assembly easier while maintaining precision.
Data Source
AI summary
An angle-adjustable post assembly for supporting a rail panel on a stairway includes a post portion that is a generally hollow rectangular tube and a pivot rod that extends laterally from the post portion. The pivot rod is cylindrical to allow pivoting adjustment to position the post portion in a vertical orientation for multiple incline angles. The angle-adjustable post assembly also includes a base portion defining a plurality of first through holes, each of which is configured to receive a first fastener. A top bracket with an arcuate portion that is sized and shaped to correspond to the circumference of the pivot rod defines a pair of second through holes, each configured to receive a second fastener.