Stepless Hoist Arm Length and Height Adjustment
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Solution Overview
Problem
Motor-driven wheelchairs and scooters are too heavy to be manually lifted, and manually operated wheelchairs may be too heavy for elderly or unfit individuals to load or unload from vehicles, necessitating a reliable and easy-to-use hoist mechanism that can be easily adjusted for different vehicles.
Innovation Solution
A hoist mechanism with a pivot post, lifting arm, and actuator system that allows stepless adjustments in arm length and height, featuring undercut slots and clamping mechanisms for secure attachment of flexible lifting straps, enabling variable positioning and secure lifting of wheelchairs or scooters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the lifting arm is made fixed in length and height, then the structure is simple and reliable, but it cannot be easily adjusted for different vehicle sizes and load requirements
Solution Approach 1:
The lifting arm is designed with variable length capability through telescopic sections that can extend and retract. The arm includes a main section and an extendable section that can be adjusted to different lengths using locking mechanisms, allowing the hoist to adapt to various vehicle sizes and loading requirements while maintaining structural integrity during operation.
Solution Approach 2:
The lifting arm is divided into multiple segments or sections that can be independently adjusted. The arm consists of a main fixed section and an extendable section that can be locked at different positions, enabling flexible configuration for different vehicles without requiring complete redesign of the entire arm structure.
2Adaptability or versatility
If the lifting arm is made extendable with adjustment mechanisms, then adaptability to different vehicles is improved, but the structural complexity and potential reliability issues increase
Solution Approach 1:
The lifting arm incorporates telescopic sections with positive locking mechanisms that can be adjusted to different lengths and securely locked in place. The locking system uses mechanical interlocks or pin-based mechanisms that provide reliable fixation, ensuring the arm maintains its extended or retracted position without unintended movement during the lifting operation.
3Adaptability or versatility
If the pivot post is made fixed in position, then the installation is simple and reliable, but it cannot be easily transferred to another vehicle
Solution Approach 1:
The hoist system is divided into modular components including a pivot post assembly, lifting arm assembly, and base plate assembly that can be easily disconnected and reconnected. The pivot post is mounted on a removable base plate with standardized mounting holes, allowing quick installation and transfer between different vehicles without complex structural modifications.
Data Source
AI summary
Disclosed is a hoist mechanism comprising a lifting arm wherein: when the lifting arm is in a fully raised position, a projecting upper end section of a major part of the lifting arm extends substantially horizontally; an effective length of the projecting upper end section is made variable by the provision of an extension element adjustably fixed to it; and the lifting arm is variable in upstanding height by a provision of a lower end section slidably connected to the major part of the lifting arm, wherein both length and height variations are made by stepless adjustments.