Chair for supporting reinforcing elements
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Solution Overview
Problem
Existing rebar chairs for concrete pours are limited in their versatility and often leave noticeable marks on the cured walls during tilt wall pours, and they do not provide sufficient adjustability in rebar elevation for various pour configurations.
Innovation Solution
A rectangular box-like chair with adjustable height and width dimensions, featuring internal braces, notches, and feet or rails that allow for multiple rebar elevation settings and minimize marking on the cured wall, enabling support in both foundation and tilt wall pours with minimal cosmetic impact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If traditional rebar chairs are used in tilt wall pours, then rebar support function is achieved, but noticeable marks are left on the cured walls
Solution Approach 1:
The patent extracts the harmful marking function from the chair by using a low-profile design where only minimal portions of the chair contact the cured wall surface. The chair structure is designed to provide necessary rebar support while minimizing the contact footprint that would otherwise create visible marks on the finished wall.
Solution Approach 2:
The patent changes the geometric parameters of the chair, specifically reducing its height and adjusting its contact surface area. By modifying these dimensions, the chair provides adequate rebar elevation while minimizing the visible footprint on the cured wall, thereby reducing cosmetic impact and repair requirements.
2Adaptability or versatility
If fixed-dimension chairs are used, then manufacturing is simplified, but adaptability to different pour configurations is limited
Solution Approach 1:
The patent applies dynamics by making the chair dimensions adjustable rather than fixed. The chair can be configured in multiple height and width variations to accommodate different rebar elevation requirements for various pour configurations, including both foundation and tilt wall applications, without requiring completely different chair designs.
Solution Approach 2:
The patent creates a universal chair design that can serve multiple functions across different concrete pour types. By providing adjustable dimensions and configuration options, a single chair family can be used for both foundation pours requiring specific elevation support and tilt wall pours requiring minimal marking, eliminating the need for specialized chairs for each application.
3Length of moving object
If taller chairs are used to increase rebar elevation, then rebar support height is improved, but chair stability and concrete load resistance are reduced
Solution Approach 1:
The patent addresses the strength-height tradeoff by optimizing the chair's dimensional proportions. Rather than simply increasing height, the design adjusts the relationship between height, width, and base area to achieve adequate rebar elevation while maintaining sufficient load-bearing capacity. The chair dimensions are proportioned to provide stability and concrete resistance appropriate for the intended application.
Data Source
AI summary
A concrete chair elevates rebar above an underlying surface. The chair includes a rectilinear rim having a length, width and height of different distance. The rim may be oriented so each side abuts the underlying surface so rebar can be supported at three different heights above the underlying surface. In a foundation pour, the chair supports rebar at three different elevations. In a tilt wall pour, the chair supports rebar at three different elevations and produces a mark on the cured wall of considerably reduced extent.