Reinforcement Bar Spacer Wheel with Collapsible Cage and Latching Mechanism
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Solution Overview
Problem
Existing spacer wheels for reinforcement rods in concrete construction are often difficult to position securely and tend to fall off, leading to suboptimal placement of rebar within the concrete, which can hinder the formation of desired structures.
Innovation Solution
A unitary spacer wheel design with a base section and two pivotable sections connected by hinges, featuring saddle surfaces and outer circular edges that capture the reinforcement rod, along with a latching mechanism for secure clamping, allowing easy installation and repositioning without damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional spacer wheels are used, then rebar positioning is attempted, but the spacer wheels are difficult to position securely and fall off
Solution Approach 1:
The spacer wheel incorporates a collapsible cage structure with movable legs that can transition between expanded and collapsed states. During installation, the legs are compressed to fit over the rebar, then expand to engage with the rebar surface, providing secure retention while maintaining ease of installation.
Solution Approach 2:
The spacer wheel is divided into multiple segments or legs that can move independently. This segmentation allows the structure to adapt to the rebar diameter and provide multiple contact points, improving retention reliability while enabling simple snap-on installation.
2Reliability
If spacer wheels are designed to clamp securely, then retention improves, but installation becomes more complex
Solution Approach 1:
The collapsible cage structure utilizes the rebar itself as part of the clamping mechanism. When the cage is compressed onto the rebar, the rebar diameter provides the reaction force needed to expand and lock the legs in place, eliminating the need for separate actuation mechanisms while ensuring secure clamping.
Solution Approach 2:
The movable legs act as intermediaries between the cage structure and the rebar. These legs transmit and distribute the clamping force around the rebar perimeter, providing secure retention through a simple geometric mechanism rather than complex fastening systems.
3Ease of manufacture
If spacer wheels are made easily manufacturable, then production cost decreases, but clamping reliability may be compromised
Solution Approach 1:
The spacer wheel employs a thin-walled collapsible cage structure that can be efficiently formed through stamping or drawing processes. This geometry is ideal for high-volume metal forming operations while maintaining sufficient structural integrity to provide reliable clamping when properly engaged with the rebar.
Solution Approach 2:
The dynamic collapsible structure allows the spacer to be manufactured in a compact, flat state for easy handling and storage, then transformed into its functional three-dimensional clamping configuration during installation. This reduces manufacturing complexity while ensuring clamping reliability through proper geometric design.
Data Source
AI summary
A spacer wheel for use in construction using reinforcement rods cast into a compound such as concrete. The spacer wheel is configured to space a reinforcement rod from adjacent surfaces as the as the concrete is cast into a mold. The spacer wheel is of a three part design and has a base section and left and right pivotable sections. The spacer wheel uses an integrally molded hinge to join each pivotable section to the base section. The design also uses a dual rack and paw mechanism to clamp the spacer wheel onto the reinforcement rod.