Figure Hip Joint Structure for Wide Leg Spread Without Visible Gaps

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Solution Overview

Problem

Existing hip joint structures for figures result in unnatural and unrealistic groin appearances when the legs are spread apart due to visible gaps and exposure of the internal joint structure.

Innovation Solution

A hip joint structure featuring outwardly bent hip joint shafts with elongated receiving holes and a covering mechanism that allows wide leg spread without increasing gaps, using spherical pairs for flexible orientation and a hip joint cover to conceal the joints.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the legs are spread apart at a large angle, then the range of motion is improved, but gaps are generated at groins making the internal hip joint structure visible

Engineering Contradiction:

Improverange of motionVSAvoidvisibility of internal structure

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The hip joint shaft is designed with a curved configuration instead of a straight line, allowing the shaft to bend outward in the right-and-left direction. This curvature enables the thigh parts to be positioned closer to the body when legs are spread, reducing gaps at groins while maintaining large range of motion capability

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The hip joint cover is designed to cover the gap between the body and thigh parts, effectively nesting the internal joint structure within the external cover. This concealment mechanism hides the internal hip joint structure from external view while allowing the legs to move freely

Inventive Principle:

Principle #7Nested doll (Nesting)

2Adaptability or versatility

If the hip joint shaft is bent outward, then the thigh parts can be spread apart at a large angle, but the structure complexity increases

Engineering Contradiction:

Improveleg spread angleVSAvoidjoint structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The hip joint shaft incorporates a curved configuration that bends outward in the right-and-left direction. This single curvature modification enables large leg spread angles while maintaining a relatively simple overall structure compared to multi-component mechanisms

Inventive Principle:

Principle #14Spheroidality (Curvature)

Solution Approach 2:

The hip joint shaft is designed as a movable component that can pivot between the body and thigh part, allowing dynamic adjustment of the shaft's position and angle. This dynamic capability enables the structure to adapt to various leg positions while maintaining simplicity

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12465867B2Hip joint structure for figure, and figure

Publication Date: 2025.11.11 SEN TI NEL CO LTD

AI summary

A hip joint structure includes: right and left hip joint shafts to pivotably couple right and left thigh parts to a body of a figure; and a hip joint cover to cover gaps between the body and the right and left thigh parts. Each of the hip joint shafts is bent outward in a right-and-left direction of the figure while extending from the body toward a corresponding one of the thigh parts. Each of the thigh parts has a hip joint shaft receiving hole to receive a corresponding one of the hip joint shafts, the hip joint shaft receiving hole being formed in an elongated shape. Under a state in which the thigh parts extend straight down from the body, the hip joint shafts extend into the thigh parts, respectively, while extending outward in the right-and-left direction of the figure and downward.