Compound Applicator Nozzle Control With Spring-Biased Plug
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing compound applicators face challenges in efficiently applying viscous compounds like drywall joint compound, grout, and sealants, particularly in terms of ease of use and control over the application process.
Innovation Solution
A compound applicator with a nozzle assembly, a spring-biased plug, a cylinder for material storage, a rotatable handle, and an input mechanism that converts rotational motion into axial movement of a pull rod, allowing for precise control over the application process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a simple nozzle assembly is used, then the device complexity is reduced, but the control precision over compound dispensing deteriorates
Solution Approach 1:
The nozzle assembly is segmented into distinct functional components: a plug member that seals the nozzle opening, a pull rod that transmits actuation force, and a spring that provides sealing force. This segmentation allows each component to be optimized independently while maintaining overall simplicity.
Solution Approach 2:
The spring-loaded plug member automatically seals the nozzle opening when not in use, eliminating the need for separate sealing mechanisms. The system self-regulates the dispensing state through the spring force, providing both simplicity and precision.
2Ease of operation
If a rotatable handle with input mechanism is added, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The handle is designed to rotate dynamically, converting rotational motion into linear motion of the pull rod through a cam mechanism. This dynamic transformation provides intuitive control while maintaining a relatively simple mechanical structure.
Solution Approach 2:
The cam mechanism acts as an intermediary between the rotatable handle and the linear pull rod movement. It translates the user's rotational input into precise linear displacement of the plug member, improving ease of operation without requiring complex control systems.
3Reliability
If the plug is biased into the first position with a spring, then the reliability of sealing is improved, but the force required to open the nozzle increases
Solution Approach 1:
The spring provides just enough biasing force to ensure reliable sealing during storage and transport, but not so much force that it becomes difficult to open. The cam mechanism provides mechanical advantage to overcome the spring force during actuation.
Solution Approach 2:
The cam mechanism replaces a direct linear connection with a rotational actuation system, providing mechanical advantage that reduces the force required to overcome the spring bias and move the plug member.
4Adaptability or versatility
If the handle position is made adjustable, then the adaptability to different users is improved, but the device complexity increases
Solution Approach 1:
The adjustment mechanism is segmented into discrete positional settings with detents, allowing the handle to be positioned at specific locations along the longitudinal axis. This segmentation provides adaptability while keeping the adjustment mechanism simple.
Solution Approach 2:
The adjustment mechanism uses simple detent features rather than complex continuous adjustment systems, providing sufficient adaptability for different users without requiring sophisticated mechanisms.
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 solution provides improved control and ease of use in applying viscous compounds, ensuring consistent and controlled dispensing, even in hard-to-reach areas.
Implementation Method 1
a spring configured to bias the plug into the first position
Implementation Method 2
The input mechanism includes a first cam member defining an axial cam slot, a second cam member defining an angled cam slot, and a cam follower having a first roller follower configured to roll along the axial cam slot and a second roller follower configured to roll along the angled cam slot
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A compound applicator includes a nozzle assembly including a nozzle opening and a plug movable relative to the nozzle opening between a first position in which the nozzle assembly is in a closed state, and a second position in which the nozzle assembly is in an open state, a spring configured to bias the plug into the first position, a cylinder configured to receive and store a compound material, a main housing, a handle rotatable relative to the main housing, a pull rod having a first end coupled with the plug, and an input mechanism located at least partially within the handle and/or the main housing and configured to convert rotational motion of the handle into axial movement of the pull rod, thereby moving the plug from the first position toward the second position. The spring pulls the pull rod such that the pull rod is biased into tension.