Free Motion Swing Arm With Swivel Joint

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Solution Overview

Problem

Current power rack attachments, such as jammer arms, only allow vertical movement, restricting users from achieving free movement in any direction.

Innovation Solution

A free-motion swing arm mountable on an exercise rack, featuring a swivel joint that enables 180° movement around both a vertical and horizontal axis, along with a hollow tubular arm that is reversibly lockable in multiple positions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a traditional jammer arm is used, then the structure is simple and stable, but the movement is restricted to vertical axis only

Engineering Contradiction:

Improvemovement freedomVSAvoidjoint structure

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The arm is divided into multiple segments (first arm, second arm, third arm) connected by joints, allowing each segment to move independently. This segmentation enables the arm to achieve complex three-dimensional motion while maintaining manageable structural complexity through modular design

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The arm transitions from a static, fixed-position structure to a dynamic, multi-axis movable structure. The first joint allows vertical movement, the second joint allows horizontal movement, and the third joint allows rotational movement, creating a dynamically adaptable system that can reach multiple positions

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the arm is made fully movable for free motion, then the range of exercise is improved, but the stability and safety are reduced

Engineering Contradiction:

Improveexercise rangeVSAvoidposition stability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The locking mechanism is designed to secure the arm in predetermined safe positions before exercise begins. The pin can be inserted into locking holes at various angles to pre-establish stable positions, ensuring the arm is securely positioned before the user starts exercising

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The pin acts as an intermediary element between the arm segments and the frame, providing a simple yet effective means to lock the arm in place. This intermediary component enables easy transition between movable and fixed states without requiring complex locking mechanisms

Inventive Principle:

Principle #24Intermediary (Mediator)

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 users to move freely in 360 degrees, allowing for a wider range of exercises and improved user safety through adjustable locking positions.

Implementation Method 1

the swivel joint comprising a bearing and a mounting plate coupled to the bearing

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS12330010B2Free motion swing arm

Publication Date: 2025.06.17 CRANDALL SHAUN

AI summary

A free-motion swing arm includes a rack mount; a swivel joint; a hollow tubular arm; and a U bracket with a handle and a weight bearing post extending from opposite surfaces. The rack mount has a handle and mounts on an exercise rack. The swivel joint includes a bearing and a mounting plate, mounts on the rack mount, and rotates about a vertical axis. The arm is mounted to the mounting plate, rotates about a horizontal axis, and is reversibly lockable in multiple positions. The U bracket is mounted to the arm. The swing arm allows movement 180 degrees on both a vertical axis and horizontal axis and in between at the same time for free movement.