Adjustable Height Rebar Chair with Threaded Rod
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Solution Overview
Problem
Existing rebar chairs with discrete heights are difficult to use on uneven terrain and unsuitable when the desired rebar height falls between available chair heights, limiting their versatility in concrete work.
Innovation Solution
An adjustable height rebar chair featuring a tripod base with a molded plastic body and a rebar support column with a threaded rod, allowing continuous height adjustment from six to ten inches, facilitated by numerical indicia on a vertical surface for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete height chairs are used, then manufacturing simplicity is improved, but adaptability to different heights and terrains deteriorates
Solution Approach 1:
The rebar chair uses a threaded rod that can be rotated to adjust the height continuously, transforming a static discrete-height structure into a dynamic adjustable-height structure. The threaded mechanism allows the chair to adapt to any height between six and ten inches, resolving the contradiction between manufacturing simplicity and adaptability to different heights.
Solution Approach 2:
The invention changes the height parameter from fixed discrete values to a continuously adjustable range. By using a threaded rod with rotational adjustment, the height parameter can be varied continuously between six and ten inches, enabling the chair to adapt to different terrain conditions and rebar height requirements while maintaining a simple molded plastic construction.
2Device complexity
If discrete height chairs are used, then device complexity is reduced, but ease of operation on uneven terrain deteriorates
Solution Approach 1:
The threaded adjustment mechanism provides dynamic height control, allowing workers to quickly adjust the chair height on uneven terrain without requiring multiple discrete height models. This simple rotational adjustment maintains low device complexity while dramatically improving ease of operation across varying terrain conditions.
3Adaptability or versatility
If adjustable height mechanism is added, then adaptability to intermediate heights is improved, but device complexity increases
Solution Approach 1:
The threaded rod is integrated directly into the molded plastic chair body, merging the adjustment mechanism with the chair structure itself. This integration adds minimal complexity while enabling continuous height adjustment from six to ten inches, providing adaptability to intermediate heights without requiring a separate complex adjustment system.
Solution Approach 2:
The threaded rod with external adjustment handle allows the user to self-adjust the chair height without requiring tools or additional components. The simple rotational interface provides continuous height control while maintaining device simplicity, as the adjustment mechanism is straightforward and requires no complex assembly or maintenance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables precise and versatile rebar support at any height between six to ten inches, accommodating uneven terrain and intermediate height requirements, enhancing stability and compatibility with standard concrete construction hardware.
Implementation Method 1
The central core defines a threaded bore that is concentric with the vertical centerline. A rebar support column consists of a one-piece body of molded plastic that includes a threaded rod, which is threadably received in the threaded bore.
Data Source
AI summary
An adjustable height rebar chair includes a threaded rebar support column threadably connected to a tripod base, and each consists of a respective one-piece body of molded plastic. A top end of the rebar support column terminates in an adjustment handle that defines first and second concave rebar cradles that are orthogonal to each other. The rebar support column also includes a vertical surface extending from the adjustment handle toward a bottom end of a threaded rod, and the vertical surface has numerical indicia that decrease in magnitude in a direction toward the adjustment handle. A number of the numerical indicia that is located next to a top of the central core corresponds to a distance along a vertical centerline from the three feet of the tripod base to at least one of the first and second concave rebar cradles.