Rotatable Collection Bag Cuff for Blower Vacuum Moisture Control
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Solution Overview
Problem
Blower vacuum devices face issues with wet and soiled collection bags when used in vacuum mode, as existing designs allow air to escape and moisture to leak, making the bag uncomfortable to carry when filled with wet debris.
Innovation Solution
A rotatable cuff attachment for the collection bag allows it to be oriented in multiple positions, including under the vacuum tube, and includes a diffuser to direct airflow away from the bag's walls, reducing wear and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the collection bag is positioned to allow air to diffuse out, then the bag can be filled with debris, but moisture leaks and the user gets wet
Solution Approach 1:
The collection bag is made rotatable with respect to the air outlet, allowing dynamic repositioning. The bag can be rotated to different orientations (e.g., positioned below the air outlet) to control airflow direction and prevent moisture from contacting the user, while still maintaining debris collection capability.
Solution Approach 2:
The solution adds rotational freedom to the collection bag, transforming it from a fixed-position bag to one that can be oriented in multiple dimensions. This allows the bag to be positioned in three-dimensional space around the air outlet, directing airflow away from the user while preserving debris accumulation.
2Ease of operation
If the collection bag is slung over the user's shoulder for ease of maneuverability, then the user's hands are freed, but the user gets wet from wet debris
Solution Approach 1:
The rotatable collection bag allows the user to dynamically adjust the bag's position during operation. When slung over the shoulder, the bag can be rotated to orient the airflow away from the user's body, preventing wetting while maintaining the hands-free advantage.
Solution Approach 2:
The orientation parameter of the collection bag is changed from fixed to variable. By rotating the bag to different angular positions, the airflow direction is altered to protect the user from moisture while preserving the convenient shoulder-carrying operation mode.
3Quantity of substance
If the air outlet directs air into the collection bag, then debris is collected, but the bag walls experience increased wear
Solution Approach 1:
The rotatable connection allows the collection bag to be positioned at optimal angles relative to the air outlet. The bag can be rotated to receive airflow from below or at an angle, distributing the force more evenly across the bag structure and reducing concentrated wear on specific wall areas while maintaining effective debris collection.
Data Source
Figure 1
Figure 2~3
Figure 4a~4b
AI summary
An attachment (118) for a blower vacuum device (100) comprising a collection bag (122); a coupler (120) for removeably coupling the attachment (118) to an air outlet (116) of the blower vacuum device (100) and for directing air from the air outlet (116) into the collection bag (122); and a rotatable cuff (200) fixed to the collection bag (122) and rotatably mounted to the coupler (120) such that the collection bag (122) is rotatable with respect to the air outlet. (116).