Mixer Gear Shift Safety Device with Tact Switch Control

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Solution Overview

Problem

Conventional mixers experience jamming and collision of motion transmission parts during gear shifting due to interference, making smooth gear shift operations difficult.

Innovation Solution

A safety protection device for the mixer's speed changing mechanism, comprising an operating rod assembly, control unit, device panel, tact switch, motor controller, and elastic pressing assemblies, which prevents interference by controlling power to the motor controller and using an eccentric drive shaft to facilitate smooth gear shifts.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the operating rod assembly is operated during gear shift, then the gear shift operation can be performed, but the motion transmission parts will interfere with each other causing jamming and collision

Engineering Contradiction:

Improvegear shift operationVSAvoidmotion transmission parts

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The control unit detects the gear shift operation through the tact switch before the actual gear shifting occurs, and preemptively stops the motor controller. This preliminary action prevents the motion transmission parts from interfering with each other during the subsequent gear shift operation, eliminating jamming and collision risks.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control unit acts as an intermediary between the operating rod assembly and the motor controller. When gear shift is detected via the tact switch, the control unit mediates by stopping the motor controller, thereby preventing direct interference between motion transmission parts while still allowing the gear shift operation to proceed.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Use of energy by stationary object

If the motor controller continues running during gear shift, then continuous operation is maintained, but jamming and collision of motion transmission parts occurs

Engineering Contradiction:

Improvemotor controller operationVSAvoidjamming and collision

Core Design Contradiction:

Use of energy by stationary objectVSObject-affected harmful factors

Solution Approach 1:

The control unit applies preliminary anti-action by detecting the gear shift operation and stopping the motor controller before the harmful interference between motion transmission parts can occur. This preemptive measure eliminates the risk of jamming and collision while allowing the gear shift to proceed smoothly.

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The tact switch provides feedback to the control unit when the operating rod assembly is operated. The control unit uses this feedback to stop the motor controller, creating a feedback loop that prevents harmful effects (jamming and collision) while maintaining safe continuous operation.

Inventive Principle:

Principle #23Feedback

Data Source

PatentUS8956039B2Safety protection device for a speed changing device of a mixer

Publication Date: 2015.02.17 LIN WEN CHIH

AI summary

A safety protection device for a speed changing device of a mixer is provided with a control unit on an operating rod assembly, and a tact switch is used in combination with the control unit. When using the operating rod assembly to perform gear shift, the user can feel whether the gear has been shifted to the correct position based on position change of the control unit with respect to the tact switch. During gear shift, the tact switch will turn off the power to the motor controller to stop the motor, so that gear shift operation can be performed more smoothly without interference with the motion transmission parts of the mixer, and consequently, the life of the mixer can be extended.