Weight-Adjustable Dumbbell Pin Insertion Mechanism

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Solution Overview

Problem

Conventional weight-adjustable dumbbells are inconvenient and time-consuming to use due to the need to loosen a fastener to replace weight pieces.

Innovation Solution

A weight-adjustable dumbbell design featuring a dumbbell shell unit, a weight unit, and an insert pin unit, where the insert pin is used to select and adjust weight pieces by inserting into corresponding holes, allowing for quick weight adjustments without loosening a fastener.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a fastener is used to secure weight pieces in conventional dumbbells, then the weight pieces can be securely fixed, but the weight adjustment process becomes inconvenient and time-consuming

Engineering Contradiction:

Improvesecure fixation of weight piecesVSAvoidweight adjustment convenience

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The dumbbell is divided into modular components: a shell unit with multiple insert holes at different positions, a weight unit with multiple weight pieces, and an insert pin unit. This segmentation allows independent selection and insertion of weight pieces without requiring fastener operations, resolving the contradiction between secure fixation and ease of adjustment.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The insert pin acts as an intermediary mechanism between the user and the weight pieces. Instead of directly manipulating fasteners, the user inserts the pin through the weight piece and into the shell unit, which automatically secures the weight piece in place. This intermediary mechanism simplifies the operation while maintaining secure fixation.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If a fastener requiring loosening is used in conventional dumbbells, then weight pieces can be securely attached, but the weight adjustment process becomes time-consuming

Engineering Contradiction:

Improvesecure attachment of weight piecesVSAvoidweight adjustment time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The shell unit is pre-configured with multiple insert holes positioned at different locations, and the weight pieces are pre-designed with corresponding insertion paths. This preliminary arrangement allows the user to directly insert weight pieces into the shell unit without performing any loosening or fastening operations, significantly reducing adjustment time while maintaining secure attachment.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The insert pin mechanism is designed to be self-securing. When the pin is inserted through the weight piece and into the shell unit, it automatically locks the weight piece in place without requiring additional fastening operations. The system serves itself by using the insertion action to create the securing function, eliminating time-consuming fastener operations.

Inventive Principle:

Principle #25Self-service

3Adaptability or versatility

If multiple weight pieces are stacked in conventional dumbbells, then weight adjustment is possible, but the operation becomes complex and inconvenient

Engineering Contradiction:

Improveweight adjustment capabilityVSAvoidweight adjustment operation complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The dumbbell system is segmented into a shell unit with multiple discrete insert holes, a weight unit with multiple independent weight pieces, and an insert pin unit. This segmentation allows the user to selectively insert individual weight pieces into corresponding holes without dealing with complex fastening operations, simplifying the overall adjustment process while maintaining versatile weight customization.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Instead of requiring the user to loosen fasteners and manually replace weight pieces in a complex sequence, the system inverts the operation: the user simply inserts the pin through the weight piece and into the shell unit, and the pin's insertion automatically secures the weight piece. This inverted approach transforms a complex multi-step process into a simple single-action operation.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS7491157B1Weight-adjustable dumbbell

Publication Date: 2009.02.17 ASIA REGENT

AI summary

A weight-adjustable dumbbell includes a dumbbell shell unit, a weight unit, and an insert pin unit. The dumbbell shell unit includes a shell body confining a receiving space, and a weight selector rod connected to the shell body, extending into the receiving space, and formed with through holes registered with insert holes in the shell body. The weight unit is extended removably into the receiving space via an open bottom of the shell body, and includes a base member provided with two positioning posts, and weight pieces stacked on the base member. Each weight piece is formed with a rod hole for extension of the weight selector rod, and two post holes for extension of the positioning posts. The insert pin unit includes an insert pin inserted removably into a selected insert hole and extending removably through a corresponding through hole in the weight selector rod.