Retractable Pet Leash Locking Mechanism Inertia Damping

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Solution Overview

Problem

Existing retractable pet leashes suffer from damage due to continued rotation of components caused by inertia when the rope is released, leading to potential harm to pets and users as they cannot stop the rope release immediately.

Innovation Solution

A retractable pet leash design featuring a locking button and locking member that control the rotation of a rolling disc, allowing for flexible rope release and retraction while preventing damage from inertia, through a mechanism involving a torsional spring and resetting mechanism to lock and unlock the disc's rotation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the receiving and releasing button is pressed to lock the rope, then the rope can be stopped from releasing, but the rolling disc continues to rotate due to inertia causing damage and harm to pets and users

Engineering Contradiction:

Improverope locking reliabilityVSAvoidinertia damage to pet and user

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a buffer component that is pre-positioned to counteract the harmful inertial rotation of the rolling disc. When the locking button is pressed, the buffer component engages to provide preliminary anti-action against the continuing rotation, preventing damage before it occurs rather than reacting after the problem manifests

Inventive Principle:

Principle #9Preliminary anti-action

Solution Approach 2:

The patent converts the harmful inertial energy into a beneficial buffering action. The buffer component is designed to absorb and dissipate the inertial rotation energy through controlled deformation or friction, transforming the potentially damaging force into a protective mechanism that safely stops the rolling disc

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Device complexity

If a simple locking mechanism is used, then the device structure is simple, but the pet cannot stop immediately due to inertia causing harm

Engineering Contradiction:

Improvelocking mechanism structureVSAvoidinertia harm to pet and user

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The patent merges the locking function with an integrated buffer component into a unified mechanism. The buffer component is combined with the locking button assembly, allowing the system to perform both locking and inertial damping functions through a single integrated structure rather than separate components

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The buffer component acts as an intermediary element between the locking mechanism and the rolling disc. It mediates the transition from locked state to complete stop by providing a gradual deceleration path that absorbs inertial energy, preventing direct impact and damage

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

The design effectively controls the rotation of the rolling disc, allowing for safe and convenient operation by preventing damage from inertia, enabling flexible control of the rope's length and the pet's movement range.

Implementation Method 1

The first shaft is sleeved with a torsional spring. The shell is provided with a stopper, one end of the torsional spring is against with the stopper, the other end of the torsional spring is against the pivoting seat

Methodology Applied

Scientific EffectTorsional spring: Torsion Spring

Implementation Method 2

The shell is provided with an elastic part below the limit part. Press the pulling member to push the mounting seat to rotate to the limit part and contact the elastic part, and it can not continue to rotating for the stop from the elastic part. After the pressing power disappears, the elastic part pushes the mounting seat to reset

Methodology Applied

Scientific EffectElastic force: Elasticity

Implementation Method 3

The locking part cooperates with adjacent teeth of the rolling disc, the pressing part cooperates with the resetting part, thereby locking and releasing the rolling disc

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS20230200356A1Retractable pet leash

Publication Date: 2023.06.29 DONGGUAN JIASHENG ENTERPRISE CO LTD

AI summary

A retractable pet leash comprises a shell with opposite ends, a rolling disc contained in the shell, a rope wound in the rolling disc, a locking button and a locking member; the shell is provided with a mounting hole; the locking button includes a mounting seat, a pulling member and a resetting member; the mounting seat is pivoted inside the shell; the mounting seat has a main body and a sliding slot passing through the main body; the pulling member is arranged on the mounting seat, a bottom of the pulling member passes through the sliding slot to connect the resetting member; the locking member is pivoted inside the shell and has a pivoting seat, a pivoting part, a locking part and the pressing part; the locking part cooperates with adjacent teeth of the rolling disc, the pressing part cooperates with the resetting part.