Portable Rebar Bender With Selectable Bend Radius Surfaces
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Solution Overview
Problem
Existing rebar bending tools lack flexibility to accommodate different diameters and bend radii, necessitating multiple tools and compromising on bend quality due to fixed curvature limits.
Innovation Solution
A portable electric power tool with a bend mechanism featuring rotatable abutment portions and a bias portion driven by a DC brushless motor, allowing for adjustable bend radii and user-controlled bending extent through a trigger-activated mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed curvature bending tool is used, then the tool structure is simple, but it cannot accommodate different rebar diameters and bend radii requirements
Solution Approach 1:
The patent applies the dynamics principle by making the abutment portions rotatable relative to each other, allowing the bending mechanism to dynamically adjust its geometry. The first and second abutment portions can rotate to change the bend radius, enabling the same tool to handle different rebar diameters and curvature requirements rather than being fixed in a single configuration.
Solution Approach 2:
The bending tool is segmented into multiple independent abutment portions (first, second, and third abutment portions) that can move and rotate independently. This segmentation allows each portion to be positioned optimally for different bending scenarios, providing versatility without requiring multiple complete tools.
2Adaptability or versatility
If multiple fixed-curvature bending tools are used to cover different rebar sizes, then all bend radius requirements can be met, but the quantity of tools and complexity increases
Solution Approach 1:
The patent implements universality by designing a single bending tool that can perform multiple functions across different rebar sizes and bend radii. The rotatable abutment portions enable one tool to replace what would traditionally require multiple specialized tools, as each tool can now be configured for different bending scenarios through rotation and positioning of the abutment portions.
3Manufacturing precision
If manual bending is used for precision control, then bend quality can be maintained, but productivity and user efficiency decrease
Solution Approach 1:
The patent replaces manual mechanical bending with an electric motor-driven system. The electric motor provides controlled rotational force to move the abutment portions and execute bends, substituting human physical effort and manual control with automated motor control, thereby increasing productivity while maintaining precision through controlled motor operation.
Solution Approach 2:
The controller monitors the position and movement of the abutment portions during bending operations and adjusts motor operation accordingly. This feedback mechanism ensures precise control of bend angle and radius while automating the process, allowing the system to achieve manufacturing precision comparable to manual operation but with significantly higher productivity.
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 flexible bending of rebar across various diameters and bend angles, improving user efficiency and compliance with building regulations by allowing selective control of bend radius and angle.
Implementation Method 1
an electric motor configured to cause the bias portion to be movably driven relative to the support portion
Data Source
AI summary
A tool for bending elongate objects including an electric motor having a motor output shaft, a bend mechanism having a support portion and a bias portion wherein first and second abutment portions of the support portion are separated by a space between them through which a third abutment portion provided by the bias portion can be moved in use. Force to be applied by the first, second and third abutment portions to an elongate object in use at different locations along the length of the elongate object for bending the elongate object, the third abutment portion having a plurality of bending surface portions each of which has a different radius of curvature and wherein the third abutment portion can be secured in different rotational positions thereby enabling a user to select the bending surface portion which engages the elongate object being bent in use.