Double-Elbow Trigger Mechanism for High-Pressure Washer
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Solution Overview
Problem
Existing trigger mechanisms for high-pressure washers require significant force to operate, especially when opening a closed valve, leading to user fatigue and increased production costs due to high-precision manufacturing requirements.
Innovation Solution
A trigger mechanism with a four-link mechanical linkage, including a primary and secondary elbow link, rocker arm, and slots or guideways, which provides amplified force reaction with a lower force of action, allowing for ergonomic and lightweight design without high-precision machining, and enabling multiple amplification levels for efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a simple levering mechanism with a piston-like pulling mechanism is used to amplify force, then the trigger becomes easier to operate, but high-precision manufacturing is required and the mechanism is vulnerable to impurities in pressurized liquid
Solution Approach 1:
The trigger mechanism is divided into multiple discrete components: trigger, primary elbow link, secondary elbow link, rocker arm, and handle. Each component performs a specific function in the force transmission chain, allowing for easier manufacturing of individual parts while achieving cumulative force amplification through their coordinated arrangement.
Solution Approach 2:
The mechanism employs dynamic geometric relationships where the effective lever arms change during operation. The elbow links create variable mechanical advantage throughout the trigger's movement range, providing high force amplification when needed (when opening closed valve) while maintaining operational flexibility.
2Ease of operation
If a mechanical linkage with three effective links is used to obtain mechanical advantage, then force amplification is achieved, but two links must have variable length requiring high-precision manufacturing
Solution Approach 1:
The force amplification function is distributed across multiple fixed-length components (trigger, primary elbow link, secondary elbow link, rocker arm) rather than requiring variable-length links. Each segment contributes to the overall mechanical advantage through its geometric arrangement and pivot points.
Solution Approach 2:
Multiple mechanical linkage functions are merged into a single integrated mechanism. The primary and secondary elbow links work together with the rocker arm to provide cumulative force amplification, eliminating the need for complex variable-length links while achieving the desired mechanical advantage.
3Reliability
If a trigger mechanism requiring significant force is used, then valve control is achieved, but user fatigue increases and operation becomes tiring over extended periods
Solution Approach 1:
The mechanism introduces intermediary components (elbow links, rocker arm) between the user's direct trigger pull and the valve actuation. These intermediaries amplify the user's input force and transmit it effectively to overcome the valve's resistance, reducing the effort required from the user while maintaining reliable valve control.
Solution Approach 2:
The mechanism dynamically changes the mechanical advantage parameter throughout its operation. When opening a closed valve (highest resistance), the geometric arrangement provides maximum force amplification. As the valve opens and resistance decreases, the mechanical advantage adjusts accordingly, optimizing the force required at each stage of operation.
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 mechanism reduces the effort required to operate the trigger gun, providing a robust and ergonomic design that is easier to handle and maintain, while minimizing production costs and user fatigue.
Implementation Method 1
a primary elbow link (37) and a secondary elbow link (38), wherein the trigger mechanism provides a stronger amplification of a force of action when opening a closed valve, than when opening an open valve even further
Data Source
Figure 1a
Figure 1b
Figure 1c
AI summary
A trigger gun (1) for a high-pressure washer is disclosed, where the trigger gun comprises a handle (2), a valve (3) rigidly supported by the handle and a trigger mechanism. The valve further comprises an actuation element (6) for the opening and closing the valve, and the trigger mechanism provides a cooperation between the trigger and the actuation element. The trigger gun (1) further comprises a rocker arm (8) having a second area or point of contact for cooperation with the actuation element, a primary elbow link (37), and a secondary elbow link (38). The trigger mechanism further comprises a primary mechanical linkage constituted by the handle (2), trigger (4), primary elbow link (37), and rocker arm (8) that are pivotally connected in a closed loop, and a secondary mechanical linkage constituted by the handle (2), trigger (4), secondary elbow link (38), and rocker arm (8) that also are pivotally connected in a closed loop. The primary mechanical linkage is employed when changing the valve from a closed state to a first open state and the secondary mechanical linkage is employed when changing the valve from its first open state to a second open state.