Ladder Loading System Idler Link Mechanism
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Solution Overview
Problem
Existing ladder loading systems face challenges in reducing the clearance distance for the undercarriage without compromising operational effectiveness, particularly when space constraints are present due to varying vehicle roof configurations and attachment systems.
Innovation Solution
The introduction of an idler link that rotates about an idler axis, coupled with the stowage frame through a control member, acts as a force multiplier, allowing the control member to be connected closer to the main pivot axis, reducing the clearance distance by using smaller radii and adjusting the angular rotation ratio between the idler link and stowage frame.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the control member is connected closely to the main pivot axis, then the clearance distance for the undercarriage is reduced, but the force required to expand or compress the control member increases
Solution Approach 1:
An idler link is introduced as an intermediary mechanical element between the control member and the main pivot axis. The idler link rotates about an idler axis and couples the rotation of the stowage frame to the control member, enabling the control member to be positioned closer to the pivot axis while maintaining acceptable force levels through the mechanical advantage provided by the idler link's rotation coupling
Solution Approach 2:
The solution adds a rotational dimension by introducing the idler link that rotates about an idler axis. This additional rotational degree of freedom allows the system to transform the linear force requirement into a rotational coupling mechanism, effectively reducing the radial clearance distance while distributing the force requirement across the rotational motion of the idler link
2Force
If the pivot location on the stowage frame is spaced from the pivot axis, then the control member can generate necessary torsion forces, but the undercarriage creates clearance requirements that conflict with vehicle roof configurations
Solution Approach 1:
The idler link serves as a mediator that decouples the relationship between the control member's pivot location and the main pivot axis. By introducing this intermediate rotational element, the system can generate necessary torsion forces through the idler link's rotation while allowing the control member to be positioned closer to the pivot axis, thereby reducing undercarriage clearance requirements and improving adaptability to various vehicle roof configurations
3Length of stationary object
If the loading system is mounted to extend from the rear of the vehicle, then the undercarriage clearance is maintained, but the system creates safety hazards and is unsightly
Solution Approach 1:
The invention utilizes rotational motion about an idler axis as an additional dimensional approach to solve the clearance problem. By transforming the traditional linear extension mounting approach into a rotational coupling mechanism, the system achieves adequate undercarriage clearance while maintaining a compact, integrated appearance on the vehicle roof, eliminating both the safety hazards and aesthetic issues associated with rear extensions
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 configuration enables the stowage loading system to be mounted on a wider range of vehicles without overhanging, maintaining operational efficiency and reducing the risk of interference with vehicle parts, while allowing for adjustable power levels and secure deployment mechanisms.
Implementation Method 1
The control member comprises a damper and a spring which are pivotally attached to the base frame and stowage frame. The spring provides assisted lift of the ladder from a deployed position to a stowed position on top of the vehicle.
Implementation Method 2
The damper provides smoothing and retardation of movement and the spring provides assisted lift of the ladder from a deployed position to a stowed position on top of the vehicle.
Data Source
Figure 1a~1f
Figure 2a~2c
Figure 3a~3c
AI summary
A ladder loading system (100) includes a base frame (120) and a stowage frame (130), wherein the stowage frame (130) is rotatable relative to the base frame (120). The stowage frame (130) and base frame (120) are connected at a least one pivot (102) having a main pivot axis. The ladder loading system includes a linkage mechanism (140). The linkage mechanism includes an idler link (142) that rotates about an idler axis (144). The linkage mechanism also includes a coupling means for coupling the idler link (142) to the stowage frame. That is, the rotation of the idler link (142) is linked to the rotation of the stowage frame in a master and slave relationship. Suitably, due to the operation of the ladder loading system, rotation of the stowage frame drives rotation of the idler link (142) about the idler axis (144). The linkage mechanism further includes a control member connected between the idler link (142) and stowage frame (130). Here, the control member is arranged so that rotation of the stowage frame causes the control member to expand and compress. The control member is arranged so that said expansion and compression exerts a controlling force on the rotation of the stowage frame.