Expandable Luggage Ratchet Locking for Easy Rezip Compression
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Solution Overview
Problem
Conventional expandable luggage is difficult to rezip when fully packed due to internal articles resisting compression, and existing systems like detent triggers are cumbersome.
Innovation Solution
A ratchet-type expansion system for luggage that allows easy compression by locking the upper end portion in place, featuring a ratchet device with pawls that prevent expansion unless manually released, and includes a biasing member to maintain engagement with ratchet teeth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional expandable luggage is fully packed, then the luggage capacity is maximized, but the luggage becomes difficult to rezip due to articles resisting compression
Solution Approach 1:
The patent employs a dynamic ratchet mechanism that allows the expansion panel to move freely in the compression direction (during packing) while automatically locking in the expansion direction. This dynamic behavior enables the luggage to be easily compressed when packed without the resistance problems of conventional zippers, while still maintaining the ability to expand when needed.
2Adaptability or versatility
If detent triggers are used for expansion, then the luggage can be expanded, but the system becomes cumbersome to operate
Solution Approach 1:
The ratchet mechanism is designed to be self-actuating through natural user interactions. When a user pulls the luggage open for packing, the expansion panel automatically engages the ratchet teeth. When the user compresses the packed luggage, the ratchet automatically locks without requiring any additional triggering action. This eliminates the need for separate detent triggers while maintaining expandability.
3Quantity of substance
If the luggage is allowed to expand freely, then the capacity increases, but the luggage cannot maintain a compact state without accidental expansion
Solution Approach 1:
The ratchet mechanism divides the expansion panel's movement into discrete steps corresponding to individual teeth engagement. Each tooth represents a stable locked position, preventing accidental continuous expansion. The segmented nature of the ratchet teeth provides multiple stable positions while maintaining the ability to expand to various capacities as needed.
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
Enables luggage to be fully packed and compacted easily, maintaining a tightly packed state without accidental expansion, enhancing packing efficiency and ease of use.
Implementation Method 1
a biasing member configured to maintain the pawl in an engaged state with the parallel teeth in the absence of an actuating force applied to the lever
Data Source
Figure 1~3
Figure 4a~4b
Figure 5a
AI summary
The article of luggage includes a luggage main body having a bottom surface and a cavity formed to receive articles for packing; an expansion body having a perimeter defining a cavity; a foldable gusset joining the luggage main body to the expansion body; and an expansion and locking device disposed internally at opposite ends of the article of luggage. The expansion and locking device is configured to allow free movement of the expansion body in a compression direction towards the luggage main body and configured to allow locking movement of the expansion body in an expanding direction away from the luggage main body. One expansion and locking device is preferably attached to two or more walls of the luggage. After finishing packing, the luggage is closed and the user pushes the expanding member towards the base member, ratcheting the pawl past the ratchet teeth to collapse the luggage.