Viscous Material Dispensing Gun with Adjustable Lost Motion Brake
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Solution Overview
Problem
Existing dispensing guns for viscous materials face issues with residual discharge due to cartridge expansion and trapped gas, leading to unintended material flow when the trigger is released, limiting the ability to achieve continuous dispensing.
Innovation Solution
The design incorporates a mechanism to reduce the lost motion of the brake means, such as a locking plate, by using a spacer or elastomeric member to control the engagement and disengagement of the brake with the drive rod, allowing for either non-oozing or continuous dispensing modes by adjusting the play within the aperture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a pressure release device with significant lost motion is used to stop residual discharge, then material oozing is prevented, but continuous dispensing operation becomes impossible
Solution Approach 1:
The brake means is designed with adjustable lost motion characteristics, allowing the operator to dynamically select between two operational modes: a first mode with reduced lost motion for continuous dispensing, and a second mode with increased lost motion for precise stopping. This dynamic adjustability resolves the contradiction by enabling the system to adapt its pressure release characteristics based on the desired operation type.
Solution Approach 2:
The invention changes the parameter of lost motion in the brake means between two distinct states. By adjusting the lost motion parameter, the system can switch between preventing residual discharge (higher lost motion) and enabling continuous dispensing (lower lost motion), thus resolving the technical contradiction through parameter variation.
2Productivity
If the brake means is designed to engage immediately without lost motion, then continuous flow is maintained, but control over dispensing termination is reduced
Solution Approach 1:
The adjustable lost motion mechanism allows the operator to dynamically change the engagement characteristics of the brake means. In continuous dispensing mode, reduced lost motion maintains pressure and flow. In controlled termination mode, increased lost motion provides precise stopping control, resolving the contradiction between continuous flow and operational control.
3Manufacturing precision
If lost motion is increased to stop material flow abruptly, then dosing precision is improved, but the ability to maintain pressure for continuous flow is lost
Solution Approach 1:
The invention adjusts the lost motion parameter of the brake means to change the pressure release characteristics. By reducing lost motion, cartridge pressure is maintained for continuous flow. By increasing lost motion, pressure is released for precise dosing control, thus resolving the contradiction through parameter adjustment.
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
This solution enables users to choose between conventional non-oozing and continuous dispensing operations, reducing residual discharge and maintaining pressure in the cartridge, thus allowing for a controlled and continuous flow of viscous materials.
Implementation Method 1
The design incorporates a mechanism to reduce the lost motion of the brake means, such as a locking plate, by using a spacer or elastomeric member to control the engagement and disengagement of the brake with the drive rod
Data Source
AI summary
A dispensing gun for viscous material including a stock supporting a push rod which is advanceable along a keep in which a cartridge of a material can be mounted. The rod is advanced by means of a catch plate and a locking plate prevents the rod retreating with the catch plate. The locking plate is carried by the rod between a first and a second position so that it acts as a lost motion brake once force is removed from the trigger in one configuration of the dispensing gun, taking the dispensing force off the cartridge to prevent leaking when the trigger is not depressed. In an alternative configuration, the lost motion is reduced, for example to zero, to allow a continuous dispensing action by maintaining the pressure in the cartridge using a pumping action of the trigger.