Collapsible Stacking Rack With Friction-Fit Crossmember Locking

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Solution Overview

Problem

Existing stacking racks lack a combination of strength, simplicity, low cost, and ease of assembly and disassembly, making them inefficient for use with heavy items and requiring significant labor for assembly and disassembly.

Innovation Solution

A collapsible stacking rack design featuring a friction-fit mechanism with upturned horizontal members and transverse crossmembers that form a secure locking system, allowing for easy assembly and disassembly, and optional roof configurations for added protection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If traditional rigid assembly methods are used for stacking racks, then structural strength is improved, but assembly and disassembly complexity increases

Engineering Contradiction:

Improvestructural strengthVSAvoidassembly complexity

Core Design Contradiction:

StrengthVSDevice complexity

Solution Approach 1:

The stacking rack is divided into modular components (vertical members, horizontal members, crossmembers) that can be independently assembled and disassembled. The friction-fit mechanism creates segmented connections that maintain structural integrity while enabling easy separation, resolving the contradiction between strength and assembly complexity.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Traditional mechanical fastening systems (bolts, welds, permanent connections) are replaced with a friction-fit mechanism. This substitution eliminates complex assembly hardware while maintaining structural strength through friction-based locking, directly addressing the contradiction between strength and assembly simplicity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Strength

If heavy-duty materials and rigid connections are used, then load-bearing capacity is improved, but ease of assembly deteriorates

Engineering Contradiction:

Improveload-bearing capacityVSAvoidease of assembly

Core Design Contradiction:

StrengthVSEase of operation

Solution Approach 1:

Heavy-duty rigid connections (welds, bolts, permanent fasteners) are replaced with a friction-fit mechanical system. This allows the rack to maintain high load-bearing capacity through friction and geometric locking while enabling assembly and disassembly without specialized tools or equipment, resolving the contradiction between strength and ease of assembly.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The friction-fit mechanism is designed to be self-locating and self-locking. When components are assembled, they automatically find their correct position and lock into place through friction, eliminating the need for complex alignment procedures or additional fastening operations, thus improving ease of assembly while maintaining strength.

Inventive Principle:

Principle #25Self-service

3Stability of the object's composition

If permanent fastening methods are used, then structural stability is improved, but disassembly difficulty increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidease of disassembly

Core Design Contradiction:

Stability of the object's compositionVSEase of operation

Solution Approach 1:

Permanent fastening methods (welding, bonding, threaded fasteners) are replaced with a reversible friction-fit system. The friction connection provides sufficient structural stability during use but can be easily broken by applying slight force to overcome the friction, enabling rapid disassembly without damaging components or requiring special tools.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The connection system transitions from static permanent fastening to a dynamic friction-based system. During normal use, friction maintains stable connections, but when disassembly is needed, a small dynamic force easily overcomes the friction, allowing quick separation. This dynamic characteristic resolves the contradiction between stability and ease of disassembly.

Inventive Principle:

Principle #15Dynamics

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 design provides a strong, cost-effective, and easily manageable stacking solution that can support heavy items while being easily assembled or disassembled by a small team, with modular components for versatile use and storage.

Implementation Method 1

The crossmember is fitted to the end assemblies at the turn-up space of the end assemblies in a friction-fit manner

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS8919363B1Collapsible stacking rack

Publication Date: 2014.12.30 JOHNSON CURTIS LAROY

AI summary

A collapsible stacking rack is constructed of end assemblies and friction-fit crossmembers. The crossmembers feature slots that engage in slots formed between the vertical members of the end assembles and turn-ups on the ends of horizontal members of the end assemblies. As a result, a box-like construction results from simply fitting the crossmembers into place, resulting in a strong rack that may be easily disassembled for storage or transport without tools or connectors. An optional roof formed of truss assemblies may be fitted into place and connected to the side assemblies by means of sleeves. Such roof is held in place by gravity, such that it may be easily removed or fitted into place as desired. A pliable fabric material is fitted over the truss assemblies to protect material within the stacking rack.