Fastening Unit for Quick Armrest Detachment on Handcarts
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Solution Overview
Problem
Conventional armrest mechanisms in handcarts have complex detachable structures, making it difficult to assemble and disassemble the armrests quickly and simply.
Innovation Solution
A fastening unit with a movable fastening assembly that has a locked and unlocked position, allowing the armrest to be easily connected and disconnected from the handcart frame, utilizing a fastening base and a fastening assembly with a first and second fastening part, and a rotatable armrest mechanism that can be inserted into a connecting groove with an elastic member for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional detachable structure is used for the armrest mechanism, then the armrest can be removed, but the structure becomes complex and difficult to assemble/disassemble
Solution Approach 1:
The detachable connection structure is divided into independent components: a connection seat fixed on the armrest, a connection rod on the handcart frame, and a fastening assembly with movable fastening members. This segmentation allows each component to perform its specific function while maintaining overall simplicity, enabling easy assembly and disassembly without complex integrated structures
Solution Approach 2:
The fastening assembly incorporates movable fastening members that can shift between locked and unlocked positions. This dynamic mechanism allows the fastening structure to transition from a rigid connected state to a detachable state through simple movement of the fastening members along the connection rod, avoiding the need for complex manual operations or multiple fastening components
2Adaptability or versatility
If the armrest is permanently fixed to the handcart frame, then structural stability is improved, but the armrest cannot be removed for cleaning or storage
Solution Approach 1:
The connection structure is pre-configured with the fastening assembly positioned to automatically engage with the connection rod when the armrest is mounted. The fastening members are preliminarily arranged to shift into the locked position upon assembly, providing immediate structural stability without requiring additional fastening steps or complex securing mechanisms
Solution Approach 2:
The fastening assembly is designed to automatically lock when assembled, with the movable fastening members shifting into the locked position to secure the armrest to the frame. This self-locking mechanism eliminates the need for separate fastening operations while maintaining stable connection, and allows easy release by simply moving the fastening members to the unlocked position for removal
Data Source
AI summary
The present disclosure discloses a fastening unit, an armrest mechanism and a handcart. The handcart includes an armrest mechanism including a fastening unit. The fastening unit includes: a fastening base including a first fastening part and connected to a first object; and a fastening assembly movably connected to the fastening base, and including a second fastening part. The fastening assembly has a locked position and an unlocked position. When the fastening assembly is in the locked position, the first fastening part is fastened to the second fastening part, and the fastening assembly and the fastening base encloses an accommodating space configured to accommodate a second object. When the fastening assembly is in the unlocked position, the first fastening part and the second fastening part are unfastened from each other, and the second object is capable of being separated from the fastening unit.