Stair Step Jig Assembly with Adjustable Triangular Support
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Solution Overview
Problem
Existing jig devices for smoothing concrete steps lack the ability to maintain a consistent angle and adjust to varying riser heights, leading to inconsistent tread finishing.
Innovation Solution
A hingedly coupled jig device with a riser adjustment and leg that forms a triangle, allowing the jig to extend along the full length of a tread and maintain a fixed angle, with adjustable height to accommodate riser heights between 5.0 inches and 8.0 inches, ensuring precise smoothing of concrete steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed jig device is used for smoothing concrete steps, then the device structure is simple, but it cannot accommodate varying riser heights and cannot maintain consistent angle
Solution Approach 1:
The jig device incorporates a telescopic leg with adjustable length and a triangular support structure that can be configured for different riser heights. The leg includes multiple positioning holes allowing adjustment to accommodate riser heights from 5.0 to 8.0 inches, transforming a static fixed jig into a dynamic adjustable system that adapts to varying step dimensions while maintaining structural integrity
Solution Approach 2:
The jig device is divided into separable components including a main body, an adjustable leg with telescopic sections, and a triangular support structure. This segmentation allows independent adjustment of each component to match different riser heights and maintains simplicity by using modular elements that can be reconfigured rather than requiring a completely complex redesigned system
2Manufacturing precision
If a jig device without angle maintenance is used, then the device complexity is low, but the tread finishing consistency is poor
Solution Approach 1:
The triangular support structure is pre-configured with specific geometric relationships that inherently maintain the correct angle for tread finishing. The leg is pre-adjusted to the appropriate length for the given riser height before the smoothing operation begins, ensuring that the jig maintains consistent angle throughout the process without requiring complex real-time adjustments or controls during operation
Solution Approach 2:
The adjustable leg with telescopic sections allows the jig to dynamically adapt its geometry to match different riser heights while maintaining the correct operating angle. The triangular support structure provides dynamic stability, ensuring consistent angle maintenance across various step configurations, thereby achieving precise tread finishing without overly complicating the device
Data Source
AI summary
A stair step jig assembly for smoothing treads on concrete steps includes a jig that is elongated to a predetermined length to extend along a full length of a tread on a concrete step for smoothing the tread before the concrete has cured. A riser adjustment is hingedly coupled to the jig and the riser adjustment unit abuts a concrete form that is positioned against the riser of the step adjacent to the tread upon which the jig is positioned. A leg is hingedly coupled to the jig and the leg slidably engages the riser adjustment such that each of the leg, the riser adjustment and the jig forms a triangle. The leg has engages a top of the riser of the step adjacent to tread upon which the jig is positioned for keeping the jig at a fixed angle on the tread.