Pivoting Core Trainer With Sliding Frame for Multi-Mode Workouts

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Solution Overview

Problem

Conventional fitness devices for core training have limited exercise modes, requiring multiple devices for varied workouts, which increases cost and space requirements, and multifunctional devices are cumbersome and inconvenient.

Innovation Solution

A multifunctional core training device with a first and second frame body, elastic elements, a sliding structure, and a switch that allows the second frame body to pivot relative to the first, enabling multiple exercise modes such as a rowing machine, abdominal muscle trainer, and Roman chair, with a sliding structure that moves reciprocally on the first frame body.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If conventional fitness devices are used for core training, then exercise function is provided, but exercise mode variety is limited and multiple devices are needed

Engineering Contradiction:
Improveexercise mode varietyVSAvoidnumber of devices required
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a multifunctional core training device that can perform multiple exercise modes including rowing machine exercises, abdominal muscle training, and Roman chair exercises. The device achieves versatility through a second frame body that can pivot between different positions and a sliding structure that moves reciprocally, allowing a single device to replace multiple specialized fitness equipment

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The device employs dynamic components including a second frame body pivotally connected to the first frame body, allowing the second frame to rotate between different angular positions. Additionally, a sliding structure moves reciprocally along the first frame body, enabling the device to dynamically reconfigure its geometry to support different exercise modes without requiring multiple static devices

Inventive Principle:
Principle #15Dynamics

2Adaptability or versatility

If multiple fitness devices are used for different exercise modes, then exercise variety is achieved, but cost increases

Engineering Contradiction:
Improveexercise mode varietyVSAvoidcost
Core Design Contradiction:
Adaptability or versatilityVSQuantity of substance

Solution Approach 1:

The patent implements a multifunctional core training device that can perform multiple exercise modes including rowing machine exercises, abdominal muscle training, and Roman chair exercises. The device achieves versatility through a second frame body that can pivot between different positions and a sliding structure that moves reciprocally, allowing a single device to replace multiple specialized fitness equipment

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Adaptability or versatility

If multiple fitness devices are used for different exercise modes, then exercise variety is achieved, but space requirements increase

Engineering Contradiction:
Improveexercise mode varietyVSAvoidspace occupation
Core Design Contradiction:
Adaptability or versatilityVSArea of stationary object

Solution Approach 1:

The patent implements a multifunctional core training device that can perform multiple exercise modes including rowing machine exercises, abdominal muscle training, and Roman chair exercises. The device achieves versatility through a second frame body that can pivot between different positions and a sliding structure that moves reciprocally, allowing a single device to replace multiple specialized fitness equipment

Inventive Principle:
Principle #6Universality (Multi-functionality)

Solution Approach 2:

The device employs a compact nested structure where the second frame body is integrated within the footprint of the first frame body. When the second frame pivots to different positions, it utilizes the same spatial envelope, effectively nesting multiple exercise configurations within a single device footprint rather than requiring separate space for each exercise mode

Inventive Principle:
Principle #7Nested doll (Nesting)

4Adaptability or versatility

If multifunctional fitness device is designed, then exercise mode variety is improved, but device weight increases

Engineering Contradiction:
Improveexercise mode varietyVSAvoiddevice weight
Core Design Contradiction:
Adaptability or versatilityVSWeight of moving object

Solution Approach 1:

The device employs dynamic components including a second frame body pivotally connected to the first frame body, allowing the second frame to rotate between different angular positions. Additionally, a sliding structure moves reciprocally along the first frame body, enabling the device to dynamically reconfigure its geometry to support different exercise modes without requiring multiple static devices

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

Enables convenient and versatile core muscle training with multiple exercise modes using a single device, reducing space and cost, and enhancing user safety through adjustable positioning and stability features.

Implementation Method 1

two elastic elements (140) are disposed on the first frame body (110)... each of the two forcing elements (150) is connected to one end of one of the two elastic elements (140), and the other end of the one of the two elastic elements (140) is connected to the first frame body (110)

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentEP4470632B1Multifunctional core training device
Publication Date: 2026.02.18 CHUANG LUNG FEI
  • EP4470632B1 patent drawingFigure 1
  • EP4470632B1 patent drawingFigure 2
  • EP4470632B1 patent drawingFigure 3

AI summary

A multifunctional core training device includes a first frame body, a second frame body, a holding device, two elastic elements, two forcing elements, a sliding structure, and a switch. The second frame body is pivotally disposed on the first frame body. The holding device is disposed on the first frame body. The two elastic elements are disposed on the first frame body. The two forcing elements are respectively connected to the two elastic elements. The sliding structure is movably disposed on the first frame body. The switch is disposed on the sliding structure and is for positioning a position of the sliding structure relative to the first frame body. When the second frame body pivots relative to the first frame body, the relative position of the first frame body and the second frame body is changed.