Removable Pivoting Drawbar for Tool-Free Cart Coupling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing mobile cart coupling systems require complex and ergonomically challenging handling operations, often necessitating bending and manual manipulation at ground level, which is arduous and can lead to safety issues and increased costs due to the need for multiple drawbars and potential mechanical failures.
Innovation Solution
A removable and pivotally mounted drawbar coupling structure that allows for easy tilting and coupling without tools, featuring a U-shaped profile with a torsion spring for automatic retraction and a handle for ergonomic handling, enabling safe and efficient attachment and detachment of carts without the need for multiple drawbars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a removable drawbar is used, then the footprint of the cart is reduced and storage is facilitated, but the coupling operation becomes more complex and requires tool-based manipulation at ground level
Solution Approach 1:
The drawbar is designed to pivot between a retracted position (parallel to the transverse wall) and a functional position (extended outward). This dynamic positioning allows the drawbar to minimize footprint during storage while being easily accessible for coupling operations, resolving the contradiction between compact storage and operational accessibility
Solution Approach 2:
The drawbar operates in multiple spatial dimensions - it pivots vertically to move between retracted and functional positions, and horizontally to extend toward adjacent carts for coupling. This multi-dimensional movement transforms a ground-level manipulation problem into an elevated, ergonomically-friendly operation
2Strength
If the drawbar is permanently installed, then coupling strength is maintained, but the cost increases due to requiring one drawbar per trolley and safety regulations are circumvented
Solution Approach 1:
A single removable drawbar is designed to be universally compatible with multiple cart models through standardized coupling interfaces (transverse wall mounting and hook-type connection). This universal design eliminates the need to manufacture separate drawbars for each trolley, reducing manufacturing costs while maintaining adequate coupling strength through proper mechanical design
Solution Approach 2:
The drawbar's key dimensions and coupling interface parameters are standardized to match safety regulation requirements for train configurations. By optimizing parameters such as drawbar length, hook strength, and mounting geometry, the removable design achieves coupling strength equivalent to permanent installations while complying with safety standards that limit train sizes
3Area of stationary object
If slideable drawbars are used, then the drawbar can be retracted, but the mechanical connection seizes up over time and manipulation becomes painful
Solution Approach 1:
The drawbar uses a pivot joint with rotational freedom instead of a slideable linear connection. This dynamic rotational mechanism prevents the seizing problem inherent in slideable connections by allowing smooth angular movement without friction-induced sticking, while still achieving retraction parallel to the transverse wall
Solution Approach 2:
The drawbar is completely removed from the cart when not in use, rather than being left in a retracted but still connected state. This extraction eliminates any remaining mechanical connection that could seize, while the simple hook-type coupling allows for rapid reattachment when needed
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
This solution simplifies the coupling process, reduces operator strain, enhances safety compliance, and lowers costs by eliminating the need for multiple drawbars, while maintaining robustness and ease of use.
Implementation Method 1
which is provided with a torsion spring returning it parallel and close to said wall
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
[A mobile product transport and storage trolley comprising an enclosed volume, the interior of which is accessible via at least one door, and mounted on a wheeled chassis, said trolley comprising means for coupling to two other trolleys in the direction of travel in order to create a train of trolleys. Said coupling means comprise a detachable connecting drawbar (1), including a pivoting bar (10) movable between a first deployed position for coupling to another trolley and a second retracted position in the vicinity of the storage volume of the trolley; a plate for the removable attachment of the detachable connecting drawbar (1) to the chassis of the trolley, said plate being fixed to one side of the chassis of the trolley perpendicular to the direction of travel; and a coupling attachment at one free end of the bar (10), said attachment being fixed to the other side of the chassis relative to the direction of travel.