Foldable Drawbar Trolley with Single Holder

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Solution Overview

Problem

Existing bicycle trailers and hand trucks face challenges in usability, installation space, and cost due to complex fold-out stands and multiple receiving devices for the drawbar, which complicate switching between trailer and hand truck modes.

Innovation Solution

A trolley design featuring a foldable stand with a recessed stand element and a single drawbar holder that accommodates the drawbar in two positions, allowing for easy conversion between bicycle trailer and hand truck usage, reducing the need for multiple receiving devices and simplifying the fold-out mechanism.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If multiple receiving devices are used for detachable attachment of the drawbar, then the adaptability of the cart is improved, but the device complexity increases

Engineering Contradiction:

ImproveadaptabilityVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The single receiving device on the supporting structure is designed to accommodate the drawbar in multiple positions (first position for bicycle trailer mode, second position for hand truck mode), allowing one component to perform multiple functions that would traditionally require separate receiving devices

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

Multiple receiving devices for different attachment positions are merged into a single integrated receiving device that can hold the drawbar in various orientations, reducing the total number of components while maintaining versatility

Inventive Principle:

Principle #5Merging (Combining)

2Stability of the object's composition

If a complex fold-out stand is used to support the cart, then the stability is improved, but the installation space and cost increase

Engineering Contradiction:

ImprovestabilityVSAvoidinstallation space

Core Design Contradiction:

Stability of the object's compositionVSArea of stationary object

Solution Approach 1:

The stand is divided into a stand bracket fixed to the supporting structure and a separate stand element that can be folded between a stored position and a supporting position, allowing the support function to be activated only when needed

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The stand element is designed to be movable between a folded position (when the cart is being transported) and an unfolded position (when the cart needs to be supported), transitioning from a static to dynamic configuration based on operational needs

Inventive Principle:

Principle #15Dynamics

Data Source

PatentEP3838711B1Trolley for use as a bicycle trailer or as a hand trolley

Publication Date: 2023.06.21 CHAL TEC

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AI summary

The present invention relates to a cart (1) for use as a bicycle trailer (1) or as a handcart (1) comprising a frame (10) with a pair of wheels (13) and a loading platform (14), and a foldable drawbar (3) with a drawbar body (33) which is designed to be connected to a bicycle in a first position and to be guided by a user's hand in a second position. The cart (1) is characterized in that the foldable drawbar (3) has a drawbar holder (30) arranged on the frame (10), the drawbar holder (30) being designed to receive the drawbar body (33) in the first position and in the second position.