Removable Dolly With Spring-Biased Hinge for Door Transport
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Solution Overview
Problem
Conventional dollies lack a mechanism for removably attaching to objects like doors or planks, leading to instability, difficulty in precise positioning, and detachment during transport, especially over obstacles, requiring assistance for safe movement.
Innovation Solution
A dolly with a spring-biased hinge assembly and arm holding mechanism that allows removable attachment to objects, using spacers for enhanced frictional engagement and wheel assemblies for stability, enabling single-handed operation and secure transport over uneven surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dollies are used without a removable attachment mechanism, then the dolly structure is simple, but the dolly becomes unstable and cannot be precisely positioned along the edge of the door
Solution Approach 1:
The dolly is divided into separate functional components: a body portion, an attachment mechanism with arms that can independently engage the door edge, and a wheel assembly. This segmentation allows each component to perform its specific function while maintaining overall system stability without excessive complexity.
Solution Approach 2:
The spring-biased attachment mechanism automatically engages and disengages from the door edge through self-actuating motion. When the dolly approaches the door, the springs cause the arms to move outward and contact the door edge, creating automatic attachment without requiring additional actuators or complex control systems.
2Ease of operation
If conventional dollies lack a removable attachment mechanism, then the device is simple to manufacture, but the user cannot accurately position the dolly along the door edge and requires assistance for positioning
Solution Approach 1:
The attachment mechanism with spring-biased arms automatically positions itself along the door edge. The springs provide the force necessary for the arms to engage the door edge, enabling the user to simply guide the dolly into position rather than manually adjusting complex mounting components.
Solution Approach 2:
The spring bias force can be adjusted to control the engagement pressure between the arms and the door edge. This parameter adjustment allows the attachment mechanism to adapt to different door thicknesses and materials, maintaining accurate positioning across various conditions.
3Reliability
If conventional dollies are used without removable mounting, then the dolly structure is simple, but the dolly cannot stay attached to the door edge when encountering obstacles like steps or cables
Solution Approach 1:
The spring-biased arms are pre-loaded to maintain constant contact pressure with the door edge before any obstacle is encountered. This preliminary engagement ensures that when obstacles like steps or cables are encountered, the attachment mechanism is already prepared to maintain secure contact without requiring additional activation or adjustment.
Solution Approach 2:
The attachment mechanism transitions from a static connection to a dynamic, spring-biased connection that can adapt to varying conditions. The springs allow the arms to flex and maintain contact pressure even when the door edge geometry changes due to obstacles, providing continuous secure attachment.
4Ease of operation
If conventional dollies require two or more units to tilt the door over obstacles, then individual dolly simplicity is maintained, but the operational complexity and need for assistance increases
Solution Approach 1:
The spring-biased attachment mechanism automatically maintains engagement with the door edge during tilting operations. When the user tilts the door to overcome obstacles, the springs ensure the arms remain engaged without requiring the user to manually adjust or reposition the dolly, enabling true single-handed operation.
Solution Approach 2:
The spring force parameters are designed to maintain adequate attachment pressure during the dynamic tilting motion. This parameter optimization allows the dolly to remain securely attached even during the high-stress tilting operation, eliminating the need for multiple dollies or assistant operators.
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
Enables accurate, single-handed transportation of heavy objects by maintaining attachment to the object's edge, overcoming obstacles without assistance, and providing stability with reduced risk of detachment.
Implementation Method 1
a first spring biased hinge assembly (20) with a first leaf member (22) pivotally mounted to the body (12)
Implementation Method 2
arm holding assembly (40) with first and second arms (42, 44) extending from the leaf members (22) to frictionally engage against each other and sandwich the door (D) in between
Data Source
AI summary
A dolly for transporting doors and planks of different types using a spring loaded hinge assembly 20 with two arm holding assemblies 40, each mounted to a hinge leaf 22. The dolly is removably mounted at a predetermined location along the edge of the transported object. The frictional force exerted by the arm holding assemblies against the object keeps the dolly mounted to the latter. A wheel assembly is mounted to the arm holding assemblies.