Aircraft Door Shear Pin Receptacle With Eccentric Field Adjustment

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Solution Overview

Problem

Existing shear pin latching systems require separate eccentric components that are heavy, occupy more space, and rely on friction for securing, leading to inefficiencies in adjustment and maintenance.

Innovation Solution

A single adjustable eccentric receptacle assembly that allows adjustment by rotating an outer eccentric bushing, featuring a stabilizer member to prevent rotation of the inner bushing, thus eliminating the need for friction-based securing and reducing the number of parts, resulting in a compact and lightweight design.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If two separate eccentric bushings are used for adjustment, then the adjustment capability is achieved, but the assembly becomes heavier and occupies more space

Engineering Contradiction:

Improveadjustment capabilityVSAvoidassembly weight

Core Design Contradiction:

Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The patent combines two separate eccentric bushings into a single integrated eccentric receptacle assembly. The inner bushing and outer bushing are merged into one unit with the inner bushing positioned eccentrically within the outer bushing, eliminating the need for two separate components while maintaining the adjustment capability through rotation of the integrated assembly.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements a nested configuration where the inner bushing is positioned inside the outer bushing, with the inner bushing's axis offset from the outer bushing's axis. This nesting arrangement allows both bushings to function together as a single adjustment mechanism, reducing overall component count and assembly weight while preserving the eccentric adjustment functionality.

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If two separate eccentric bushings are used for adjustment, then the adjustment capability is achieved, but the assembly occupies more space

Engineering Contradiction:

Improveadjustment capabilityVSAvoidassembly volume

Core Design Contradiction:

Adaptability or versatilityVSVolume of moving object

Solution Approach 1:

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent implements a nested configuration where the inner bushing is positioned inside the outer bushing, with the inner bushing's axis offset from the outer bushing's axis. This nesting arrangement allows both bushings to function together as a single adjustment mechanism, reducing overall component count and assembly volume while preserving the eccentric adjustment functionality.

Inventive Principle:

Principle #7Nested doll (Nesting)

3Reliability

If friction-based securing is used for eccentric bushings, then the bushings are secured, but the securing mechanism is passive and less reliable

Engineering Contradiction:

Improvesecuring reliabilityVSAvoidsecuring mechanism complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent employs a snap-fit mechanism where the inner bushing's outwardly extending flange engages with a corresponding recess in the outer bushing. This self-locking feature automatically secures the inner bushing to the outer bushing when the assembly is rotated, eliminating the need for additional passive friction-based fastening mechanisms and providing active, positive securing.

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent replaces the passive friction-based securing mechanism with an active mechanical snap-fit engagement system. The flange-and-recess interface provides positive mechanical locking that actively prevents relative motion between the inner and outer bushings, substituting the unreliable friction-based system with a more reliable mechanical engagement.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS12480331B1Shear pin latch receptacle assembly for aircraft doors

Publication Date: 2025.11.25 AMERICAN HONDA MOTOR CO INC

AI summary

A shear pin latch receptacle assembly including an inner bushing; an outer eccentric bushing including a first inner bore configured to receive the inner bushing; a stabilizer member configured to be assembled with the inner bushing and the outer eccentric bushing to form a subassembly; and a housing including a mounting plate and a barrel, the barrel defining a second inner bore configured to receive the subassembly. The outer eccentric bushing is rotatable relative to the housing in order to adjust the receptacle assembly. In addition, when the receptacle assembly is assembled, the stabilizer member prevents rotation of the inner bushing with respect to the housing.