Transport Cart Roller Dynamics for Load Positioning
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Solution Overview
Problem
Existing transport carts struggle to precisely position heavy loads and navigate over varied terrain, including stairs, while efficiently lifting and moving cumbersome loads.
Innovation Solution
A transport cart with a frame structure featuring a first pair of rollers that can rotate about a horizontal axis and a second pair of coaxially arranged rollers, along with an adjusting mechanism allowing the rollers to be lifted for maneuvering, enabling precise positioning and movement over diverse surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hand trucks are equipped with a lifting mechanism to lift heavy loads, then the ability to transport heavy loads to higher levels is improved, but the difficulty to precisely position the load worsens
Solution Approach 1:
The patent applies dynamics by making the roller configuration changeable during operation. The transport cart transitions between different roller engagement states: in normal operation the second pair of rollers contacts the floor for stable transport, while for precise positioning the second pair is lifted and only the first pair remains engaged. This dynamic reconfiguration allows the system to optimize for either lifting capability or positioning precision depending on the operational phase.
2Adaptability or versatility
If a transport cart is designed to overcome stairs and varied terrain, then the ability to navigate diverse surfaces is improved, but the precision to position heavy loads worsens
Solution Approach 1:
The patent employs dynamics by enabling the transport cart to dynamically switch between different operational modes through the adjusting mechanism. When navigating varied terrain or stairs, the second pair of rollers is lowered to contact the floor, providing the necessary adaptability and clearance. When precise positioning is required on flat surfaces, the second pair is lifted, transforming the cart into a more stable, precision-oriented configuration. This dynamic adaptation resolves the contradiction between terrain versatility and positioning precision.
3Stability of the object's composition
If the second pair of rollers remains in contact with the floor during positioning, then the stability of the cart is improved, but the ability to rotate and move sideways worsens
Solution Approach 1:
The patent applies dynamics by making the roller-ground contact relationship changeable. The adjusting mechanism allows the second pair of rollers to be dynamically positioned: contacting the floor when stability is needed for lifting or transporting, and being lifted when maneuverability is required for rotation or sideways movement. This dynamic control of contact states enables the cart to transition between stable and maneuverable configurations as operational requirements change.
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 cart can lift heavy loads up to 500 kg, move sideways, and overcome height differences, providing versatile handling of materials like rolls of paper or coils, and is suitable for warehousing and machine loading, with enhanced stability and maneuverability.
Implementation Method 1
The first pair of rollers comprises two rollers (13.1, 13.2), each of which can be rolled about a horizontal axis (HA1, HA2) and can be rotated about a pivot axis (SA1, SA2)
Implementation Method 2
The second pair of rollers comprises two rollers (14.1, 14.2) which are rigidly arranged coaxially to one another and can be rolled around a common horizontal axis (HA3)
Implementation Method 3
two rollers (21.1, 21.2) which are movably arranged on an adjusting mechanism (20) in the area near the ground so that they can be moved into a maneuvering position if necessary, with the rollers of the second pair of rollers (14.1, 14.2) being lifted off the floor (1) when transferred to the maneuvering position
Data Source
Figure 1
Figure 2
Figure 3~4A
AI summary
The invention relates to a dolly (100), comprising a frame construction (10), which has a first roller pair (13) and a second roller pair (14) in a region close to the ground, which are attached to the frame construction (10) in such a way that the dolly (100) can be rolled across the ground (1). The first roller pair (13) comprises two rollers (13.1, 13.2), which can each roll about a respective horizontal axis (HA1, HA2) and which can each rotate about a respective swivel axis (SA1, SA2). The second roller pair (14) comprises two rollers (14.1, 14.2), which are arranged rigidly coaxial to each other and which can roll about a horizontal axis (HA3). The dolly (100) has a region (12) for manual pushing and a transport element (15) for transporting a load (2). In addition, the dolly (100) comprises two rollers (21.1, 21.2) that are movably arranged in the region close to the ground on an adjusting mechanism (20) in such a way that said rollers can be transferred into a maneuvering position if necessary, wherein the rollers (14.1, 14.2) of the second roller pair (14) are lifted off of the ground (1) during a transfer into the driving position.