Infilling Frame With Overhang Handles for Snag-Free Work-Bag Positioning

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Solution Overview

Problem

Conventional frame devices for civil-engineering work bags face issues such as bags being drawn into the frame body, knitted fabric catching on protruding pins, lengthy fixing operations, increased physical burden on workers, and inefficient storage and transportation due to indivisible or unstable divided structures.

Innovation Solution

The frame device features an inversely tapered shape with overhang handles protruding from the circumference, an assembly-type divided structure, and overhang handles that prevent the bag from being drawn in and serve as a stepping surface, allowing easy positioning and release of the bag, and stable stacking.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If pin-like attachment portions protrude radially from the frame body to prevent the bag from being drawn in, then the bag positioning function is improved, but the knitted fabric of the bag is caught by the pins during handling, reducing handleability

Engineering Contradiction:

Improvebag positioning functionVSAvoidhandleability of bag

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The frame body is divided into multiple segments with attachment portions positioned at specific locations. These segmented attachment points provide sufficient holding force to prevent the bag from being drawn in while distributing the contact points to minimize fabric entanglement during handling operations.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Attachment portions are strategically positioned at specific locations on the frame body rather than uniformly distributed. This local placement optimizes the balance between preventing bag insertion and maintaining bag handleability, with attachment points positioned where they provide maximum positioning effect with minimum interference to bag manipulation.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the frame device uses an indivisible structure, then the manufacturing simplicity is improved, but the storage and transportation efficiency deteriorates due to large space requirements

Engineering Contradiction:

Improvemanufacturing simplicityVSAvoidstorage space

Core Design Contradiction:

Ease of manufactureVSVolume of stationary object

Solution Approach 1:

The frame device is segmented into multiple detachable components that can be easily assembled and disassembled. This segmentation allows the frame to be stored in a compact configuration during transportation and storage, while maintaining manufacturing simplicity through standardized connection interfaces and modular design.

Inventive Principle:

Principle #1Segmentation

3Volume of stationary object

If the frame device uses a divided structure to reduce storage space, then the storage efficiency is improved, but the stacking stability deteriorates causing parts to collapse during storage or transportation

Engineering Contradiction:

Improvestorage spaceVSAvoidstacking stability

Core Design Contradiction:

Volume of stationary objectVSStability of the object's composition

Solution Approach 1:

The divided frame components are designed with asymmetric connection features and interlocking geometries that provide inherent stacking stability. The asymmetric design ensures that frames stack in a predetermined stable configuration, preventing collapse during storage and transportation while maintaining compact storage volume.

Inventive Principle:

Principle #4Asymmetry

Solution Approach 2:

Connection interfaces and stacking features are pre-designed into the frame components during manufacturing. This preliminary design of connection geometries and stacking arrangements ensures that assembled frames maintain stability during storage and transportation without requiring additional stabilization measures.

Inventive Principle:

Principle #10Preliminary action

4Productivity

If the frame device has an expandable upper opening for easy bag removal, then the bag extraction efficiency is improved, but the bag is undesirably drawn into the inner side of the frame body during infilling material placement

Engineering Contradiction:

Improvebag extraction efficiencyVSAvoidbag positioning control

Core Design Contradiction:

ProductivityVSEase of operation

Solution Approach 1:

Attachment portions are positioned in advance on the frame body at strategic locations. These pre-positioned attachment points enable the bag to be securely held during infilling material placement operations, preventing unintended bag insertion into the frame body while maintaining easy bag removal capability through the expandable opening design.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS12358675B2Infilling-material formation frame device and method of positioning civil-engineering work bag

Publication Date: 2025.07.15 MAEDA KOSEN CO LTD

AI summary

An infilling-material formation frame device for putting infilling material into a civil-engineering work bag made of knitted fabric, the infilling-material formation frame device comprising: a frame body having a shape tapered inversely toward an upper opening thereof opened upward; and one or a plurality of overhang handle arranged so as to protrude from an outer circumferential surface of the frame body having a positioning function to position and a stepping function to step the civil-engineering work bag, wherein the one or the plurality of overhang handle has a size larger than a mesh size of the knitted fabric of the civil-engineering work bag to such an extent that the civil-engineering work bag is not hooked on the one or the plurality of overhang handle.