Fender Hook Rope Anchor With One-Way Cam Rope Lock

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Solution Overview

Problem

Existing boat fender systems lack a quick and secure one-way rope lock mechanism, limiting the ability to tighten and release ropes efficiently.

Innovation Solution

A fender hook rope anchor with a flexible finger, open hook, and a spring-loaded cam mechanism for one-way locking, allowing easy installation, adjustment, and secure rope retention.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a traditional rope securing method (threading, looping, knotting) is used, then the rope is secured to the fender, but the ability to quickly tighten and release the rope is limited

Engineering Contradiction:
Improvequick installation and removalVSAvoidtime to tighten and release rope
Core Design Contradiction:
Ease of operationVSLoss of time

Solution Approach 1:

A cam mechanism is introduced as an intermediary device between the rope and the fender hook. The cam, when rotated, mediates the locking and releasing of the rope by engaging with the rope and preventing its movement in the tightening direction while allowing easy release when the cam is rotated to the unlocked position.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The system transitions from static rope securing (knots, loops) to a dynamic cam-based mechanism. The cam can be rotated to change its state between locked and unlocked, enabling quick adjustment of the rope position and rapid release without complex untying operations.

Inventive Principle:
Principle #15Dynamics

2Ease of operation

If a traditional rope securing method is used, then the rope is held in position, but quick adjustment of the rope position is not possible

Engineering Contradiction:
Improveadjustment of rope positionVSAvoidtime to adjust rope position
Core Design Contradiction:
Ease of operationVSLoss of time

Solution Approach 1:

The cam mechanism allows dynamic adjustment of the rope position. By rotating the cam to different angular positions, the user can quickly adjust the rope tension and position without re-threading or re-knotting, significantly reducing adjustment time.

Inventive Principle:
Principle #15Dynamics

Solution Approach 2:

The cam mechanism is designed to be manually operated by the user without requiring additional tools or complex procedures. The user can independently adjust the rope position by simply rotating the cam, making the system self-sufficient for quick adjustments.

Inventive Principle:
Principle #25Self-service

3Reliability

If the fender hook is rigid, then it provides stable retention on the fender, but it cannot be easily flexed for installation and removal

Engineering Contradiction:
Improveretention of fender hookVSAvoidinstallation and removal
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The fender hook is constructed from a flexible material or with a flexible structure that allows it to bend and deform during installation and removal. This flexibility enables the hook to be easily placed over the fender and removed when needed, while still providing reliable retention through its elastic properties and engagement mechanism.

Inventive Principle:
Principle #30Flexible shells and thin films

Solution Approach 2:

The fender hook transitions from a rigid, fixed structure to a dynamic, flexible component. The flexibility allows the hook to adapt during installation and removal operations, while the retention mechanism (such as the cam or locking feature) ensures stable holding when in position.

Inventive Principle:
Principle #15Dynamics

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 quick installation and removal, secure rope positioning, and efficient adjustment, enhancing the usability and stability of boat fender systems.

Implementation Method 1

a spring-loaded cam mechanism for one-way locking

Methodology Applied
Scientific EffectCam mechanism: Cam

Implementation Method 2

a spring-loaded cam mechanism

Methodology Applied
Scientific EffectSpring: Spring

Implementation Method 3

The flexible finger provides some retention of the fender hook to prevent the fender hook from becoming dislodged

Methodology Applied
Scientific EffectElasticity: Elasticity

Data Source

PatentUS12589842B2Fender hook rope anchor
Publication Date: 2026.03.31 DANIK-HOOK
  • US12589842B2 patent drawing
  • US12589842B2 patent drawing
  • US12589842B2 patent drawing

AI summary

Improvements in a rope securing anchor for a boat fender that provides a versatile rope securing system to secure a boat to a dock or other location. The fender hook rope anchor can be quickly installed or removed from a boat fender and the rope can be quickly adjusted for the rope position within the fender hook rope anchor. The rope anchor has an open hook with a flexible tension finger that is easily installed and removed over the fender of a boat. A user can place the fender hook rope anchor where needed and quickly removed when not needed. There is an opening where a rope can pass and be secured using a one-way spring loaded and releasable cam. A user can quickly pass a rope through the opening to secure a line, and can pull the line out of the rope anchor when not needed.