Rotary Dial Weight Selector for Dumbbell Cradle

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Solution Overview

Problem

Users face inefficiencies in changing dumbbell weights during workouts, as manual adjustments are time-consuming and can disrupt heart rate, especially when switching between exercises requiring different weight amounts.

Innovation Solution

A dumbbell assembly with a cradle that incorporates a rotary dial input mechanism communicating with selectors within each dumbbell, allowing simultaneous adjustment of weight connections through a rotary gear system, enabling quick changes without manual handling.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If manual weight adjustment is used, then device complexity is low, but time consumption increases and workout intensity is disrupted

Engineering Contradiction:

Improveweight adjustment speedVSAvoidweight adjustment mechanism

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent combines multiple weight adjustment mechanisms into a single integrated system. The cradle houses multiple dumbbells and provides a unified control interface (rotary dial) that simultaneously adjusts weights on all dumbbells, eliminating the need for separate manual adjustments for each dumbbell and dramatically reducing adjustment time.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The cradle serves multiple functions: it supports multiple dumbbells, houses the weight selection mechanisms, and provides the unified control interface. This multi-functional design allows a single device to perform what would traditionally require multiple separate weight adjustment operations, improving productivity without proportionally increasing complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Adaptability or versatility

If manual weight changes are made during exercise, then adaptability to different exercises is improved, but heart rate stability deteriorates

Engineering Contradiction:

Improveexercise transition flexibilityVSAvoidheart rate stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The system allows users to pre-select and prepare weight adjustments before actually needing to change exercises. The rotary dial interface enables users to anticipate weight changes and have them ready in advance, allowing smooth transitions between exercises without sudden manual adjustments that would disrupt heart rate during active exercise.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The weight adjustment mechanism is designed to serve the user's exercise needs automatically through intuitive control. The rotary dial provides self-explanatory weight selection without requiring complex manual manipulation during exercise, allowing users to maintain focus on their workout while the system handles the technical weight changes efficiently and quietly.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS9795822B2Weight selector for multiple dumbbells

Publication Date: 2017.10.24 IFIT INC

AI summary

A dumbbell assembly includes a cradle shaped to receive a first dumbbell having a first weight set and a second dumbbell having a second weight set. The dumbbell assembly further includes an input mechanism in communication with a selection mechanism incorporated into the cradle where the selection mechanism is in communication with both a first selector arranged to adjust a first connection of the first weight set to the first dumbbell and a second selector arranged to adjust a second connection of the second weight set to the second dumbbell.