Lift Support Arm Layout for Platform Alignment and Access
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Solution Overview
Problem
Existing lift systems face issues with misalignment of platforms due to high loads, leading to tripping hazards and complicating maintenance, especially when support devices are mounted on the underside of the platform, which hinders access and increases unreliability.
Innovation Solution
A support device with a movable support arm and drive mechanism that ensures platform alignment by moving to a fully extended position only when weight is applied, featuring a location monitoring switch to verify platform position and facilitate easy maintenance by mounting on the mast rather than the platform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support device is mounted on the underside of the platform, then it can support the platform weight, but it hinders access to the support device and other components on the underside of the platform for maintenance and repair
Solution Approach 1:
The support device is inverted from its conventional mounting location. Instead of being mounted on the underside of the platform, the support device is mounted on the mast. This inversion allows the support arm to extend upward to support the platform from below, reversing the typical configuration and providing excellent access to all components for maintenance while maintaining the platform support function.
Solution Approach 2:
The support device transitions from a two-dimensional platform-mounted configuration to a three-dimensional mast-mounted configuration. By mounting on the mast and using an extendable support arm, the device operates in multiple spatial dimensions, achieving both platform support and maintenance accessibility simultaneously.
2Reliability
If the support device is mounted on the underside of the platform, then it can prevent unintended lowering of the platform, but it requires a large number of electrical cables to travel with the lift, leading to unreliability
Solution Approach 1:
The support device and its electrical components are extracted from the platform and relocated to the mast. This separation removes the need for electrical cables to travel with the moving platform, as the drive mechanism and control components remain stationary on the mast, significantly reducing system complexity and improving reliability.
Solution Approach 2:
The mast serves as an intermediary structure that hosts the support device's electrical components. By using the mast as the mounting platform for electrical equipment, the system eliminates the need for flexible cabling on the moving platform while maintaining all necessary control and power functions.
3Reliability
If the support arm is moved to the fully extended position by the drive mechanism, then it can support the platform, but it cannot verify that the platform is actually at the desired level
Solution Approach 1:
A location monitoring switch provides feedback to verify the platform's position. The switch is positioned to detect whether the support arm has fully engaged with the platform, creating a feedback loop that confirms the platform is at the desired level before allowing the door to open or the lift to operate.
Solution Approach 2:
The support device uses the platform's own weight and position to trigger the location monitoring switch. When the platform reaches the correct position, its weight automatically causes the support arm to extend and engage the switch, allowing the system to self-verify its position without additional sensors on the platform.
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3C
AI summary
A support device (100) for a lift system comprising a mast and a platform movable along the mast, the support device (100) comprising: a support arm (20) for supporting the platform; and a drive mechanism (30) for moving the support arm, wherein the support arm (20) is movable between a stowed position, a partially extended position and a fully extended position, wherein the drive mechanism (30) is actuatable to move the support arm (20) from the stowed position to the partially extended position but not to the fully extended position, and wherein the support arm (20) is movable from the partially extended position to the fully extended position when the weight of the platform is applied to the support arm (20).