Handtruck Multidirectional Wheel Assembly for Lateral Maneuverability

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Solution Overview

Problem

Conventional handtrucks pose health and safety issues due to poor maneuverability, requiring significant leverage and ergonomic strain when navigating obstacles and tight spaces, and often necessitate three-point turns, leading to back strain and potential injury.

Innovation Solution

A self-supporting handtruck design featuring multidirectional wheels with multiple sets of rollers, allowing lateral movement and reduced leverage requirements, combined with an adjustable incline mechanism and secondary load support for improved load balance and ergonomic handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional fixed wheels are used, then the handtruck can support heavy loads, but it cannot move laterally or sideways

Engineering Contradiction:

Improvelateral movement capabilityVSAvoidmaneuverability

Core Design Contradiction:

Adaptability or versatilityVSEase of operation

Solution Approach 1:

The wheel assembly is segmented into multiple independent rollers (at least three rollers) that can rotate about different axes. Each roller can independently orient itself to accommodate movement in multiple directions, enabling both forward motion and lateral movement without requiring swivel mechanisms

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wheel assembly transitions from a static fixed wheel configuration to a dynamic multi-roller configuration where the rollers can actively reorient during movement. This dynamic adaptation allows the handtruck to seamlessly switch between forward motion and lateral movement modes

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If large wheels are used to negotiate bumps and obstacles, then the handtruck can handle rough terrain, but the centre of mass of the load must be located far rearward of the wheel axles

Engineering Contradiction:

Improveobstacle negotiation capabilityVSAvoidload balance complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The single large wheel is segmented into multiple smaller rollers arranged in a cluster. This segmentation maintains the obstacle negotiation capability of large wheels while allowing the load platform to be positioned closer to the wheel assembly, as the distributed roller configuration provides stable support

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The wheel assembly extends in multiple dimensions with rollers arranged both laterally and longitudinally. This multi-dimensional configuration allows the load to be positioned closer to the wheel assembly while maintaining stability and obstacle negotiation capability

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Volume of moving object

If the handtruck is in an upright position, then it can be stored compactly, but significant levered rearward force is required to pull the handle means towards the operator

Engineering Contradiction:

Improvestorage spaceVSAvoidlevered force required

Core Design Contradiction:

Volume of moving objectVSForce

Solution Approach 1:

The handtruck is designed to be self-supporting in the upright position through the multi-roller wheel assembly configuration. The distributed roller support creates a stable base that naturally supports the load without requiring the operator to apply significant levered force to maintain balance during position transitions

Inventive Principle:

Principle #12Equipotentiality

4Ease of operation

If swivel castors are used as rear wheels, then the handtruck can move on four wheels, but the load becomes unstable and may swing or rotate about the caster

Engineering Contradiction:

Improvemovement flexibilityVSAvoidload stability

Core Design Contradiction:

Ease of operationVSStability of the object's composition

Solution Approach 1:

The rear wheel assembly is segmented into multiple fixed rollers instead of using a single swivel caster. This segmentation provides distributed fixed support points that stabilize the load while still allowing movement flexibility through the multi-roller configuration

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of using swivel castors that allow lateral rotation (which causes instability), the invention inverts the approach by using fixed rollers that can individually reorient. This eliminates the unwanted load swinging while maintaining movement capability

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS8556279B2Handtruck

Publication Date: 2013.10.15 MCKINNON PETER RODNEY

AI summary

A handtruck or trolley (90) comprising: a handtruck frame (91) including a frame base (98) extending to an outward handle portion (97) of the handtruck frame, the handtruck frame generally lying in a first plane and having a front and a rear; a load support (95) mounted to the front of the handtruck frame and generally lying in a second plane inclined relative to the first plane; and a handtruck wheel assembly (60,80) mounted to the frame base, the handtruck wheel assembly comprising at least two sets of wheels (65a,60b,82a,82b), each set having a fixed main axis (6ba,106b) of rotation parallel to the first plane and capable of travel in a direction normal to the main axes, wherein the wheel or wheels of at least one of the sets of wheels is or are multidirectional and capable of travel in a lateral direction or in an angular direction having a vector component parallel to the main axes.