Backpack Sprayer Compound Curve and Drip Rail Design
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Solution Overview
Problem
Conventional backpack sprayers are uncomfortable to wear and prone to leakage, which can result in toxic chemicals coming into contact with the operator's body, posing safety risks.
Innovation Solution
The design features an integrally molded structure with a compound curve profile for better fit and comfort, including a lower convex curve and rearward angle to direct spillage away from the body, along with peripheral side flanges and a lower drip rail to prevent liquid from reaching the operator, and a pump and hose system for efficient spraying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional round tank is used, then the sprayer can be manufactured simply, but it becomes awkward and uncomfortable to wear on the operator's back
Solution Approach 1:
The patent applies curvature by replacing the conventional round tank with a bag-like structure that conforms to the operator's back. The bag is formed from flexible material that can be inflated and deflated, allowing it to adapt to the operator's body shape while maintaining ease of manufacture through simple bag formation processes.
2Device complexity
If a conventional tank design is used, then the structure can be simple, but leakage occurs and chemicals can contact the operator's neck or back
Solution Approach 1:
The patent introduces an intermediary barrier system consisting of a detachable cover and a drip rail. The cover acts as a first barrier that can be removed for cleaning and the drip rail serves as a secondary barrier that channels any leakage away from the operator's body, preventing harmful contact while maintaining structural simplicity.
Solution Approach 2:
The patent extracts the leakage protection function from the main tank structure by adding separate protective components (cover and drip rail) that can be independently designed and assembled. This allows the main tank to remain simple while adding specialized protection against leakage through separate, purpose-built elements.
3Quantity of substance
If the tank is made larger to increase capacity, then more chemicals can be carried, but the weight and bulk increase making it less comfortable to wear
Solution Approach 1:
The patent uses a flexible bag structure made from thin, lightweight material that can be inflated to hold the required chemical capacity. The flexibility of the bag allows it to conform to the operator's back, distributing the weight more comfortably compared to a rigid tank of the same capacity, while the thin film material minimizes overall weight.
Data Source
AI summary
A back pack sprayer apparatus for spraying liquids. The apparatus includes an integrally molded structure having an upper tank portion and a lower frame portion. A support stand can be connected to the molded structure, the support stand defining a supporting plane when the apparatus is in an upright position on the ground. The molded structure can have a front side defining a compound curve having an upper concave curve configured to receive an operator's back, and a lower convex curve terminating in a lowermost distal end forming a rearward angle of at least about 20 degrees with an axis normal to the supporting plane. The apparatus can include a pump, a hose, and a sprayer. A cover can be attached to the lower frame portion concealing the pump. The apparatus can include peripheral flanges and a lower drip rail which can help prevent liquid from contacting an operator.