Portable Rebar Bender With Selectable Bend Radius Control
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Solution Overview
Problem
Existing rebar bending tools lack the flexibility to accommodate different diameters and bend radii, as they are not designed to handle various specifications of rebar efficiently, which can lead to compromised bending quality and safety due to fixed curvature limits.
Innovation Solution
A portable electric power tool with a bend mechanism featuring a bias portion and abutment portions that allow for adjustable bending radii, utilizing a DC brushless motor and planetary gear arrangement to provide controlled bending forces, enabling users to bend rebar of different diameters to specific angles and radii.
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 bend mechanism incorporates a movable bias portion that can be adjusted to different positions along the longitudinal axis of the tool. This dynamic adjustment capability allows the tool to accommodate various rebar diameters and bend radii requirements, transforming a static fixed-curvature tool into an adaptable system that responds to different construction needs.
Solution Approach 2:
The bend mechanism is divided into distinct functional portions: a support portion with fixed abutment portions and a movable bias portion with an adjustable abutment portion. This segmentation allows independent adjustment of the bias portion relative to the support portion, enabling precise control over bending radius while maintaining overall structural integrity.
2Manufacturing precision
If manual rebar bending is performed, then no special tool is needed, but bending precision and safety are compromised
Solution Approach 1:
The patent replaces manual mechanical bending operations with an electrically powered bend mechanism. A DC brushless motor drives a planetary gear arrangement that converts rotational motion into linear movement of the bias portion, providing controlled, repeatable bending forces that ensure precise bending angles and radii while reducing physical strain on operators.
Solution Approach 2:
The bend mechanism is designed as a self-contained portable unit with an integrated battery pack that provides electrical power. The tool performs its own bending operation without requiring external power sources or additional equipment, making it a complete self-service solution for precision rebar bending in construction settings.
3Force
If high bending force is applied to thick rebar, then bending can be achieved, but the rebar may be damaged if bent beyond acceptable curvature limits
Solution Approach 1:
The adjustable bias portion allows operators to set the desired bending radius before applying force. By pre-positioning the abutment portion at the appropriate distance from the rebar, the system provides geometric feedback that limits the maximum curvature achievable, ensuring that even high bending forces do not exceed acceptable curvature limits and compromise rebar integrity.
Solution Approach 2:
The system allows dynamic adjustment of the bending radius parameter by repositioning the bias portion along the longitudinal axis. This parameter change capability enables operators to select appropriate bend radii based on rebar diameter and required application, ensuring that bending forces are applied within safe limits while still achieving the necessary bend for each specific rebar specification.
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
The tool allows for precise and safe bending of rebar by varying the bending radius, accommodating different rebar diameters and angles, enhancing user control and safety by ensuring the rebar is bent within acceptable curvature limits, thus improving construction efficiency.
Implementation Method 1
DC brushless motor
Implementation Method 2
planetary gear arrangement
Data Source
Figure 1A
Figure 1~2
Figure 3~5
AI summary
A portable electric power tool for bending elongate objects comprising 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 and wherein the bend mechanism is operatively coupled to the motor output shaft via a transmission of the tool which in use causes linear relative movement between the bias portion and the support portion for causing 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.