Rotatable Hand Application Device for Adhesive Control
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Solution Overview
Problem
Existing hand application devices for liquids or viscous materials, such as adhesives, face limitations in ergonomics, usability, and adaptability, particularly in reaching inaccessible surfaces and preventing adhesive spills, due to rigid nozzle placement and limited handle adjustments.
Innovation Solution
A hand application device with a rotatable and adjustable handle mounted via a ball-and-socket joint, allowing multiple rotational adjustments, combined with various controllers for flow rate control, including finger triggers, optoelectric, electrical-pneumatic, and mechanical systems, to enhance ergonomics and adaptability, and prevent adhesive spills.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the nozzle is placed at an angle of approximately 100° from the body axis of the supply hose, then the device can be operated, but the ergonomics and handiness are restricted and adaptability is limited
Solution Approach 1:
The handle is made rotatable and adjustable via a pivot bearing, transforming the rigid fixed-angle nozzle placement into a dynamic system that can adapt to different work conditions and spatial relationships, thereby improving both ergonomics and adaptability simultaneously
Solution Approach 2:
The invention adds rotational and adjustment capabilities around multiple axes (first rotational axis perpendicular to body axis, second rotational axis for bracket, third rotational axis for handle itself), moving from a single fixed position to multi-dimensional positioning, enabling better reachability and adaptability
2Adaptability or versatility
If a rigid pivot bearing is used for rotatable mounting of the handle, then rotation is enabled, but lateral adjustment possibilities are limited
Solution Approach 1:
The invention merges multiple adjustment functions into a single integrated handle assembly that combines rotation around the first rotational axis with lateral adjustment possibilities, allowing both capabilities to work together for improved handiness and adaptability
3Temperature
If heating elements are integrated in the attachment, then heating function is provided, but heat transmission to the handle becomes a problem
Solution Approach 1:
The invention introduces thermal insulation as an intermediary between the heating element in the attachment and the handle, blocking the harmful heat transmission while allowing the heating function to operate effectively for maintaining adhesive temperature
4Adaptability or versatility
If the nozzle is positioned to reach inaccessible surfaces, then reachability is improved, but adhesive drops on the hand increase
Solution Approach 1:
The invention positions the nozzle in the extension of the body axis of the supply hose, creating a localized optimal spray direction that reaches inaccessible surfaces while directing the adhesive flow away from the user's hand, thus improving reachability while preventing adhesive drops
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 device achieves improved ergonomics, increased reachability of hard-to-access surfaces, reduced adhesive spills, and more economical adhesive handling through enhanced adaptability and precise flow control, while allowing for integration of heating elements without heat transfer to the handle.
Implementation Method 1
a preferred design variant provides a ball-and-socket joint or spherical bearing instead of a rigid pivot bearing
Implementation Method 2
It is preferably spring-loaded and causes, for example, a small quantity of adhesive to flow through the nozzle in the case of lighter pressure actuation
Implementation Method 3
Pressure actuations of the finger trigger cause the generation of an electrical control signal, using a variable resistor, as the manipulated variable for the further control process
Implementation Method 4
This valve is electrically activatable, i.e., a solenoid valve, for example
Implementation Method 5
a light source is excited more or less depending on the position of the finger trigger and accordingly a photodiode or a photo transistor receives a corresponding radiation quantity
Implementation Method 6
In order to prevent external light influences from corrupting the control signal, transmission of the radiation quantity using an optical waveguide is preferred
Implementation Method 7
A further advantage is that a heating element can be placed in the attachment and the heat can hardly be transmitted at all to the handle
Data Source
AI summary
The invention relates to a hand application device (1) having improved handling capability, in that its individual elements (2, 7, 12) are rotatable and adjustable to one another around four rotational axes (8, 10, 13, 28).