Construction Mixer Speed Control Without Manual Gear Shifting

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Solution Overview

Problem

Existing manually operated construction mixers are prone to damage and lack flexibility in adapting to various mixing tasks, requiring manual gear shifting and leading to increased noise and manufacturing complexity.

Innovation Solution

A manually operated construction mixer with an electric drive motor, a gear reduction system, and an electronic control unit that allows for variable speed control, eliminating the need for manual gear shifting and providing a robust design adaptable to different mixing tasks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If manual gear shifting is used to provide different mixing speeds, then the mixer can adapt to various mixing tasks, but the device complexity increases and noise level rises

Engineering Contradiction:

Improveadaptability to various mixing tasksVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical gear shifting system with an electronic speed control system. The control unit electronically regulates the drive motor's speed based on mixing task requirements, eliminating the need for manual gear shifts and mechanical transmission components. This substitution reduces device complexity while maintaining adaptability to different mixing tasks.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent implements continuous speed variation by changing the drive motor's operating parameters electronically. The control unit adjusts the motor speed continuously according to the mixing task, replacing the discrete speed steps of mechanical gear shifting. This approach maintains versatility while simplifying the overall device structure.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If manual gear shifting mechanism is included, then speed adaptation is possible, but manufacturing costs increase

Engineering Contradiction:

Improvespeed adaptation capabilityVSAvoidmanufacturing costs

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent eliminates mechanical gear shifting components and replaces them with an electronic control system. This removal of mechanical parts simplifies manufacturing processes, reduces component count, and lowers production costs while preserving the essential speed adaptation capability through electronic regulation of the drive motor.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If the housing cover is directly connected to the lower housing part by screw connections, then assembly is simple, but the design is susceptible to damage

Engineering Contradiction:

Improveassembly simplicityVSAvoidsusceptibility to damage

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces a crossbar as an intermediary component between the housing cover and the lower housing part. The crossbar absorbs and distributes mechanical stresses, protecting the screw connections from direct load. This intermediary structure maintains assembly simplicity while significantly improving the overall reliability and damage resistance of the housing assembly.

Inventive Principle:

Principle #24Intermediary (Mediator)

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 mixer achieves improved mixing quality, reduced noise, lower manufacturing costs, and enhanced user flexibility through precise speed control, while ensuring durability and ease of operation.

Implementation Method 1

a drive motor, preferably an electric motor (5), which is suitable and designed to provide a speed

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 2

a gearbox or a gear reduction of the drive motor which provides a motor speed

Methodology Applied

Scientific EffectGear mechanism: Gear

Data Source

PatentEP4654445A1Manually operated construction mixing machine, in particular manually operated stirring machine for stirring and/or mixing building materials

Publication Date: 2025.11.26 COLLOMIX RUHR UND MISCHGERATE

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AI summary

The invention relates to a manually operated construction mixing machine (1), in particular a manually operated mixing machine for stirring and/or mixing building materials, with a housing (2) in the interior (35) of which a drive motor (5) is at least partially enclosed, wherein the drive motor (5) has at least one drive shaft (7) which can be directly or indirectly connected to a mixing and/or stirring tool. Furthermore, an actuating device (13) is provided by means of which the drive motor can be actuated, wherein the drive motor (5), preferably controlled via a control device coupled to the actuating device (13), is suitable and configured to provide a speed, preferably a load speed, at the drive shaft (7) driving the mixing and/or stirring tool of 200 rpm to 1000 rpm, preferably from 250 rpm to 750 rpm, most preferably from 300 rpm to 650 rpm.