Dual Retractable Pet Leash With Independent Stop Mechanisms

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Solution Overview

Problem

Existing dual retractable pet leashes are prone to tangling and lack the ability to individually stop one leash without affecting the other, compromising control and safety when walking multiple pets.

Innovation Solution

A twin pet leash design that allows the reel portion to rotate relative to the handle portion, featuring individually controllable leash stop mechanisms with color-coded triggers to prevent tangling and enable independent control of each leash.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single reel with a single trigger mechanism is used to control both leashes, then the device complexity is reduced, but the ability to individually stop each leash is lost

Engineering Contradiction:

Improvereel mechanism complexityVSAvoidindividual leash control

Core Design Contradiction:

Device complexityVSEase of operation

Solution Approach 1:

The single reel mechanism is segmented into two independent reel assemblies, each with its own trigger mechanism. This allows each leash to be controlled independently while maintaining a relatively simple overall structure. Each reel can be stopped or released without affecting the other leash.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Two separate reel mechanisms are merged into a single integrated leash system that handles both leashes simultaneously. The handles are positioned close together and the reels are mounted in close proximity, allowing the user to manage both leashes with minimal effort while maintaining independent control.

Inventive Principle:

Principle #5Merging (Combining)

2Stability of the object's composition

If the reel portion is fixed relative to the handle portion, then the structural stability is improved, but the anti-tangling function is compromised

Engineering Contradiction:

Improvereel-handle structural stabilityVSAvoidleash tangling

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The reel portion is made dynamically adjustable relative to the handle portion through a rotation mechanism. The reel can rotate freely to prevent tangling during normal use, and can be locked in specific positions when needed. This dynamic adjustment allows the system to adapt between stability and anti-tangling requirements.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The relative position and orientation parameters of the reel portion are made variable through the rotation mechanism. The reel can change its angular position relative to the handle to optimize both stability and anti-tangling function, adjusting the geometry of the leash system as needed.

Inventive Principle:

Principle #35Parameter changes

3Device complexity

If both leashes are stopped simultaneously through a single trigger mechanism, then the device complexity is reduced, but the control precision for individual pets is lost

Engineering Contradiction:

Improvetrigger mechanism complexityVSAvoidindividual pet control precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The single trigger mechanism is segmented into two separate triggers, each independently controllable. This allows precise control of each leash individually, enabling the user to stop one pet while allowing the other to move freely, thereby improving control precision without significantly increasing overall device complexity.

Inventive Principle:

Principle #1Segmentation

4Manufacturing precision

If the reel portion cannot rotate relative to the handle portion, then the manufacturing precision is improved, but the anti-tangling function is eliminated

Engineering Contradiction:

Improvereel-handle assembly precisionVSAvoidleash tangling

Core Design Contradiction:

Manufacturing precisionVSObject-affected harmful factors

Solution Approach 1:

A rotation mechanism is introduced that allows the reel portion to dynamically adjust its position relative to the handle portion. This mechanism includes rotation joints and locking features that enable precise control of the reel's angular position, maintaining manufacturing precision while providing the necessary freedom of movement to prevent tangling.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8256385B2Dual retractable pet leash with ability to stop pets individually

Publication Date: 2012.09.04 GOLDENBERG CADE H

AI summary

A twin pet leash prevents tangling by permitting the reel portion to rotate relative to the handle portion, and features individually controllable leash stop mechanisms. Even while an individual leash is stopped, the reel portion can rotate relative to the handle portion so that tangling of the pet leashes is avoided. The leash handle portion has two triggers which are color coded to match the color of the leash, so that a user can readily identify which of the two leashes are to be stopped. Either or both of the leashes can be stopped or released, without interfering with the operation of the other one of the leashes.