Dispenser Push Rod Sensing for Cassette Maintenance Alerts

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing dispensers for compound-containing containers lack an automated mechanism to alert users when the cassette or foil pack holder needs maintenance due to wear, dirt, or contamination, relying on manual estimation of dispensed quantities.

Innovation Solution

A dispenser equipped with a sensor to detect push rod movements, a control unit to calculate dispensed volume, and an indicator to provide a user-perceivable signal when a defined volume is reached, ensuring timely maintenance alerts based on container type and quantity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If manual estimation of dispensed quantities is used, then device complexity is reduced, but measurement precision and reliability of maintenance timing deteriorate

Engineering Contradiction:

Improvedevice complexityVSAvoidmeasurement precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces manual mechanical estimation with an electronic sensor system that automatically detects push rod movements and calculates dispensed volumes. The sensor electronically monitors the push rod's position changes and transmits data to a control unit, eliminating the need for manual counting while providing precise measurement of compound dispensed.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The control unit provides automated feedback to the user through visual or audible signals when the dispensed volume reaches a predefined threshold. This feedback mechanism ensures timely maintenance alerts without requiring continuous user monitoring, resolving the contradiction by automating the measurement and notification process.

Inventive Principle:

Principle #23Feedback

2Reliability

If automated sensor and control unit are added, then measurement precision and reliability are improved, but device complexity increases

Engineering Contradiction:

ImprovereliabilityVSAvoiddevice complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The control unit serves multiple functions: it processes sensor data, calculates dispensed volumes, stores maintenance thresholds, and provides user feedback through multiple output channels. This multi-functionality consolidates several components into one, improving reliability while minimizing the increase in overall device complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system automatically monitors its own operation through the sensor detecting push rod movements and self-calculates dispensed volumes without external intervention. This self-service capability enhances reliability by ensuring consistent monitoring while adding only minimal complexity compared to manual methods.

Inventive Principle:

Principle #25Self-service

3Ease of operation

If manual checking of cassette is performed, then ease of operation is maintained, but loss of time and productivity deteriorate

Engineering Contradiction:

Improveease of operationVSAvoidloss of time

Core Design Contradiction:

Ease of operationVSLoss of time

Solution Approach 1:

The system performs preliminary monitoring of dispensed volumes continuously during operation, so that maintenance alerts are generated automatically at the optimal time. This eliminates the need for users to manually check and estimate dispensed quantities, saving time while maintaining ease of operation through simple visual or audible notifications.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The automated feedback system provides real-time information about dispensed volumes and maintenance status, allowing users to respond only when necessary. This reduces time loss by eliminating routine manual checks while keeping the system easy to operate through intuitive alert mechanisms.

Inventive Principle:

Principle #23Feedback

4Reliability

If automated maintenance alert system is implemented, then reliability is improved, but device complexity and manufacturing cost increase

Engineering Contradiction:

ImprovereliabilityVSAvoidease of manufacture

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces complex mechanical maintenance tracking systems with a simpler electronic sensor and control unit combination. This substitution improves reliability through automated digital monitoring while actually simplifying manufacturing compared to mechanical counters or indicators, as electronic components are more readily available and easier to integrate.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12564857B2Dispenser and a control method of the dispenser

Publication Date: 2026.03.03 HILTI AG

AI summary

A dispenser for compound-containing containers includes a cassette for a container; at least one push rod displaceable relative to the cassette; a motor for moving the at least one push rod; a main switch for generating a control signal in response to actuation of the main switch; a control unit for controlling the motor; and a sensor configured to detect the moving of the push rod which is electronically connected to the control unit. The control unit is configured to store the dispensed volume of the compound and provide a feedback to the user once the dispensed volume of the compound reaches a defined value, and the user gets informed as soon as the cassette should be checked. Based on saved information of the dispensed volume of the compound, the user can be informed if a specified volume is reached and a check of the cassette is recommended.