Expandable Hand Truck Hinged Frame Design
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Solution Overview
Problem
Hand trucks are limited in their ability to support items once moved, as they are not wide enough to accommodate larger loads, and there is a need for a solution that allows for movable storage of items, particularly during relocation or renovation processes.
Innovation Solution
A hand truck design featuring a plurality of frames that can expand from a closed position to fit through standard doorways to an open position, providing a wider platform for storage, with a center frame and side frames that are hingedly attached to facilitate this transformation, allowing the hand truck to support larger items and serve as a movable platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the hand truck is designed with a fixed narrow width to fit through standard doorways, then it can pass through doorways, but it cannot support large items once moved
Solution Approach 1:
The hand truck is divided into multiple hinged sections that can be folded together for narrow passage and unfolded for expanded support. The frame includes a first section and a second section connected by hinges, allowing the structure to be segmented into compact and expanded configurations.
Solution Approach 2:
The hand truck transitions from a static narrow structure to a dynamic expandable structure. The hinged connections enable the frame to change its configuration dynamically, expanding the support width when needed and contracting to fit through doorways when required.
2Adaptability or versatility
If the hand truck is designed with an expandable structure to support large items, then it can support large items, but it becomes complex and difficult to maneuver
Solution Approach 1:
The complex expandable structure is broken down into simpler hinged sections that can independently fold and unfold. Each section is relatively simple in design, but their coordinated movement creates the expandable functionality, reducing the perceived complexity of each individual component.
Solution Approach 2:
The hinged sections are designed to nest together when folded, with the second section folding alongside the first section. This nesting arrangement minimizes the overall complexity by allowing sections to occupy the same spatial envelope when in compact configuration.
3Area of stationary object
If the hand truck width is increased to provide a platform for storage, then it can support and store items, but it cannot fit through standard doorways
Solution Approach 1:
The hand truck employs dynamic hinged connections that allow the frame to transition between compact and expanded states. When moving through doorways, the sections fold to minimize width; when positioned for storage, the sections unfold to maximize platform area.
Solution Approach 2:
The platform area is created through segmented hinged sections that can be deployed when needed. The first and second sections form the platform when unfolded, providing sufficient area for storage while maintaining the ability to contract for passage through narrow openings.
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 hand truck can expand to support items up to 5 ft by 10 ft in the open position while fitting through standard doorways in the closed position, offering a versatile solution for moving and storing bulky items efficiently.
Implementation Method 1
the first side of the center frame is hingedly attached to a second side of a first side frame; moveable between an open position and a closed position
Data Source
AI summary
A hand truck having a plurality of hingeably engaged sides that is expandable from a closed position dimensioned to fit through a standard doorway, to an open position to form a movable platform. A platform enclosure is also disclosed.