Retractable Support Bar Fastener With Metal Latch Impact Protection
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Solution Overview
Problem
Existing retractable support bar positioning fasteners face issues with impact resistance, leading to locking problems and reduced service life due to the use of aluminum extruded structures, which can break under high-speed impacts.
Innovation Solution
A positioning fastener with a protective member made of high-strength metal, featuring a latching portion and a pivot device with a torsion spring, providing enhanced impact resistance and ease of replacement, while maintaining cost-effectiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an aluminum extruded structure is used for the elastic button, then the positioning fastener is lightweight and inexpensive, but it has low impact resistance and can break under high-speed impacts
Solution Approach 1:
The positioning fastener is divided into two functional parts: the body (casing) made of lightweight aluminum extrusion and the protective member made of high-strength material. This segmentation allows each part to be optimized for its specific function while controlling overall cost.
Solution Approach 2:
The invention uses a composite structure combining aluminum extrusion material for the body with high-strength material (such as steel or alloy) for the protective member. This composite approach provides both impact resistance and cost-effectiveness by applying high-strength material only where necessary.
2Reliability
If the elastic button head is engaged into the hole of the inner tube, then the positioning fastener provides locking function, but it cannot withstand high-speed impacts without breaking
Solution Approach 1:
The protective member is positioned beforehand to surround and protect the elastic button head before impact occurs. This pre-positioned protective structure absorbs and distributes impact forces, preventing the button head from breaking during high-speed impacts while maintaining reliable locking function.
3Duration of action of stationary object
If a high-strength protective member is added to the positioning fastener, then impact resistance and service life are improved, but device complexity increases
Solution Approach 1:
The protective member is integrated with the body through the pin rod to form a unified structure. The protective member comprises an intermediate panel and two side panels that work together with the body's actuating segment and finger grip, creating a cohesive design that enhances protection without adding excessive complexity.
4Strength
If the protective member is made of high-strength material, then impact resistance is enhanced, but manufacturing cost increases
Solution Approach 1:
High-strength material is used locally only for the protective member where impact resistance is critical, while the rest of the body remains made of cost-effective aluminum extrusion. This localized application of high-strength material provides necessary protection while controlling overall manufacturing cost.
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
The solution enhances the impact resistance and service life of the positioning fastener, allowing it to withstand high-speed impacts without breaking and facilitates cost savings through selective material use and easy replacement of components.
Implementation Method 1
The elastic force of the torsion spring keeps the actuating segment toward the inner tube
Implementation Method 2
The pivot shaft is inserted through a through hole on each of two opposite support panels of the mount, the second holes of the two side panels of the protective member, the torsion spring and the through hole of the casing to pivotally connect the positioning fastener to the mount
Data Source
AI summary
A positioning fastener pivotally connected to a mount of a retractable support bar for locking the connection state of an inner tube and an outer tube is disclosed to include a casing that has an actuating segment and a finger grip, a protective member made of metal and connected to the actuating segment and having a latching portion for selectively engaging in one of a series of holes on the inner tube, a pin rod inserted through the casing and the protective member, and a pivot device, which includes a pivotally inserted through the casing and the protective member and a torsion spring mounted on the pivot shaft.