Orbital Floor Brush Bristle Layout for Lower Rotational Resistance

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Solution Overview

Problem

Orbital floor brush machines face inefficiencies due to the low rotational speed of inner bristles, which reduces cleaning power and increases rotational resistance, leading to mechanical failures and customer dissatisfaction.

Innovation Solution

The orbital brush design features a brush frame with concentric or offset rings of bristle tufts of varying lengths and angles, where shorter tufts contact the surface only under heavy load, and longer tufts are parallel to the surface to maximize contact area and reduce strain.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If inner bristles are included on the orbital brush, then the cleaning coverage is improved, but the rotational energy requirement increases and rotational speed decreases

Engineering Contradiction:

Improvecleaning coverage areaVSAvoidrotational energy requirement

Core Design Contradiction:

Area of stationary objectVSUse of energy by moving object

Solution Approach 1:

The bristle tufts are segmented into different length categories (first length and second length) arranged in different rings. Longer tufts are placed in outer rings where rotational speed is higher, while shorter tufts are placed in inner rings where rotational speed is lower. This segmentation allows each region of the brush to contribute effectively to cleaning without requiring excessive rotational energy.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the brush are given different local qualities through varying bristle lengths. The outer rings have longer bristles that benefit from higher rotational speed, while inner rings have shorter bristles suited for lower rotational speed. This local differentiation optimizes the cleaning effectiveness at each radius while managing the overall energy requirements.

Inventive Principle:

Principle #3Local quality

2Force

If bristle stiffness is increased to improve cleaning effectiveness, then cleaning power is improved, but rotational resistance increases causing hopping and mechanical failures

Engineering Contradiction:

Improvecleaning powerVSAvoidmechanical reliability

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The brush applies local quality by varying bristle lengths in different rings rather than uniformly increasing stiffness throughout. This allows cleaning effectiveness to be maintained through optimized contact geometry while avoiding the harmful effects of uniformly high stiffness that would increase rotational resistance and cause hopping.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The orbital motion dynamics are optimized by matching bristle length to rotational velocity at different radii. Longer bristles in outer rings and shorter bristles in inner rings create a dynamic system where each region operates at optimal contact conditions, maintaining cleaning power while reducing overall rotational resistance and preventing mechanical failures.

Inventive Principle:

Principle #15Dynamics

3Force

If the number of bristles per tuft is increased to improve cleaning power, then cleaning effectiveness is improved, but rotational resistance increases leading to hopping

Engineering Contradiction:

Improvecleaning effectivenessVSAvoidoperational efficiency

Core Design Contradiction:

ForceVSProductivity

Solution Approach 1:

Instead of uniformly increasing bristle density throughout the brush, the invention applies local quality by varying tuft characteristics in different rings. This allows cleaning effectiveness to be optimized in each region without uniformly increasing rotational resistance, thereby maintaining operational efficiency and preventing hopping.

Inventive Principle:

Principle #3Local quality

4Area of stationary object

If bristle length is increased to maximize surface contact area, then cleaning power is improved, but rotational resistance increases

Engineering Contradiction:

Improvesurface contact areaVSAvoidrotational resistance

Core Design Contradiction:

Area of stationary objectVSUse of energy by moving object

Solution Approach 1:

The bristle system is segmented into different length categories arranged in different rings. Longer bristles are placed in outer rings where higher rotational speed naturally provides greater cleaning action, while shorter bristles are placed in inner rings where lower rotational speed would otherwise result in insufficient contact. This segmentation maximizes surface contact area where it is most effective while minimizing rotational resistance.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention changes the parameter of bristle length as a function of radial position in the brush. By varying this parameter across different rings, the system optimizes the balance between surface contact area and rotational resistance, ensuring that longer bristles are only used where the higher rotational speed can effectively drive them without excessive energy consumption.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS8291540B2Orbital brush for an orbital floor brush machine

Publication Date: 2012.10.23 TECHTRONIC FLOOR CARE TECH LTD

AI summary

An orbital blush for an orbital floor brush machine is provided according to an embodiment of the invention. The orbital brush includes a brush frame adapted to fit to the orbital floor brush machine, a first ring of first bristle tufts of a first length and oriented at a first angle, and a second ring of second bristle tufts of a second length and oriented at a second angle.