Waste Container Frame for Bag Tensioning
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Solution Overview
Problem
Existing waste container systems with clamping devices for rubbish sacks are cumbersome and inefficient, occupying unnecessary space and requiring additional support structures, which complicates the design and usage.
Innovation Solution
A container design with a frame positioned in the upper interior that allows the sack to be stretched and opened without a clamping device on the top, utilizing a changing cross-sectional area to clamp the frame in place, eliminating the need for external support and simplifying the design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a clamping device is placed at the top edge of the container to tension the bag, then the bag can be securely held, but the device becomes obtrusive and occupies excessive space
Solution Approach 1:
The patent removes the clamping device from the top edge of the container and relocates the tensioning function to the bottom interior. The frame structure with its upwardly opening U-shaped configuration performs the clamping function internally, extracting the obtrusive external clamping device and eliminating the space it occupied at the container's top edge.
Solution Approach 2:
Instead of clamping the bag at the top edge as in conventional designs, the patent inverts the approach by clamping the bag at the bottom interior of the container. The frame structure tensions the bag upward from the bottom, reversing the traditional top-down clamping approach and thereby eliminating the need for top-mounted clamping devices.
2Stability of the object's composition
If support projections are added to the side walls to support the frame, then the frame can be properly positioned, but the design becomes more complex and obstructive
Solution Approach 1:
The patent eliminates the need for support projections by removing the requirement for additional support structures. The frame's stability is achieved through its geometric configuration and the frictional contact with the bag and container walls, extracting the complex projection support system and simplifying the overall design.
Solution Approach 2:
The frame structure supports itself through its own geometry and the interaction with the bag. The U-shaped configuration with upwardly opening arms creates inherent stability through the tensioning force of the bag and the frictional contact with the container's side walls, eliminating the need for external support projections.
3Ease of manufacture
If the container has a uniform cross-sectional area, then manufacturing is simpler, but the frame cannot be easily clamped into position
Solution Approach 1:
The patent modifies the container's cross-sectional area parameter, creating a tapered configuration where the cross-sectional area increases from bottom to top. This parameter change enables the frame to be easily clamped into position at a specific height where the container's internal diameter matches the frame's external diameter, providing natural engagement without complex positioning mechanisms.
4Ease of operation
If the frame is designed to be removable, then bag replacement is easier, but the clamping mechanism must be more sophisticated
Solution Approach 1:
The patent simplifies the removable frame mechanism by eliminating complex locking or fastening systems. The frame relies on frictional contact and geometric interference for retention, allowing it to be easily removed by simple vertical extraction. This extracts the sophisticated clamping mechanism while maintaining effective bag securing during use.
Data Source
Figure 1~3a
Figure 4~7b
AI summary
A device for holding a bag, in particular a garbage bag, comprises a container (1) with a closed bottom (5), an open top (6), side walls (7), and an interior (3). A frame 11 is arranged at one position within the interior (3). The bag can be stretched within the interior (3) of the container (1) by means of this frame (11). Furthermore, the frame (11) is removable from the interior (3) of the container (1).