Rebar Positioner for Open Core Masonry Blocks
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Solution Overview
Problem
Conventional rebar positioners are not suitable for ProBlock masonry blocks with open cores, as they rely on closed core structures and are prone to shifting during installation, compromising the stability of masonry structures.
Innovation Solution
A rebar positioner designed for open core masonry blocks, utilizing a single continuous wire with laterally spaced-apart support elements and sinuous 'S'-shaped rings that extend over and are supported by the block's web, ensuring the rebar is maintained in position within the open core without relying on the next block for stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional rebar positioners with perpendicular members extending over the block core are used, then the positioners can be installed in closed core blocks, but they are prone to shifting and falling out of position when overlying blocks are installed
Solution Approach 1:
Instead of extending positioner members perpendicular to the block core (conventional design), the patent inverts the approach by having support elements lie substantially within the plane of the block's top surface, with end portions extending into the core. This inversion eliminates the perpendicular extension that caused instability while maintaining positioning functionality through the web-supported configuration.
Solution Approach 2:
The patent extracts the unstable perpendicular extension portion from the positioner design and replaces it with web-supported support elements that lie within the block's top surface plane. This extraction removes the source of instability while preserving the essential positioning function through the remaining structure.
2Ease of operation
If rebar positioners are designed to extend over the top of the block core, then they can position rebar in closed core blocks, but they must rely on the next masonry block to maintain proper position
Solution Approach 1:
The positioner design enables self-service by having the support elements rest directly on the web of the same block, eliminating dependence on overlying blocks for positioning. The web acts as an intrinsic support structure that automatically maintains positioner alignment and rebar positioning accuracy without requiring additional blocks to stabilize the system.
Solution Approach 2:
The web of the masonry block serves as an intermediary element between the positioner and the block core. By having support elements rest on the web, the positioner gains a stable intermediate support that ensures accurate positioning without relying on overlying blocks, transferring the positioning function to the block's own structural element.
3Adaptability or versatility
If conventional positioners are used with ProBlock open core blocks, then installation is attempted, but the open core structure does not support the positioner design
Solution Approach 1:
The patent applies local quality by designing support elements with specific geometric characteristics (width, curvature) that match the local geometry of the web. The support elements are configured to conform to the web's surface, creating a localized adaptation that enables the positioner to function reliably in open core blocks where conventional designs fail.
Solution Approach 2:
The patent changes key geometric parameters of the positioner design, specifically the orientation and configuration of support elements, to adapt to the open core structure. Instead of perpendicular extensions, the support elements lie within the block's top surface plane with end portions extending into the core, fundamentally changing the positioner's geometry to match the ProBlock configuration.
Data Source
AI summary
A rebar positioner for being placed within an open core of a masonry block having an open core and an adjacent closed core separated by a web. A wire defines first and second laterally spaced-apart support elements adapted to extend over and be supported by the web of the block. End portions of the first and second support elements are adapted for extending into the enclosed core of the block. A rebar positioning segment defines at least one ring adapted for being positioned within the open core of the block and surrounding a section of vertically extending rebar positioned in the open core. The wire is bent such that the end portions of the first and second support elements are adapted for extending into the closed core at a level below an upper surface of the block and the at least one ring is adapted for extending into the open core at a level below the upper surface of the block.