Integrated Reel Collar-Leash With Perimeter Grip Loop

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Solution Overview

Problem

Existing collar-leash assemblies with integrated reels are complex, uncomfortable, and inefficient in terms of space utilization, often featuring gripping surfaces that can harm animals and are difficult to disassemble.

Innovation Solution

A collar-leash assembly with an integrated reel that minimizes space usage by integrating a gripping loop with the housing, allowing the loop to fit around the housing perimeter, and enabling easy assembly/disassembly, while using a spiral spring to maintain the loop's position and ensuring the assembly is lightweight and comfortable for pets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If a traditional handle is used for the leash, then the gripping surface provides comfort, but it may cause discomfort or danger to the animal

Engineering Contradiction:
Improvegrip comfortVSAvoidanimal discomfort or danger
Core Design Contradiction:
Ease of operationVSObject-affected harmful factors

Solution Approach 1:

The patent removes the traditional handle component entirely and replaces it with a gripping loop that passes through the housing. This extraction eliminates the harmful gripping surface while preserving the functional ability to hold and control the leash.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The gripping loop serves as an intermediary element between the user's hand and the leash mechanism. Instead of directly contacting the animal or using a traditional handle, the loop provides indirect control through the housing structure, eliminating harmful contact points.

Inventive Principle:
Principle #24Intermediary (Mediator)

2Volume of moving object

If the leash and reel are integrated in a compact design, then space is optimized, but the device becomes more complex to assemble and disassemble

Engineering Contradiction:
Improvespace occupiedVSAvoidassembly and disassembly difficulty
Core Design Contradiction:
Volume of moving objectVSEase of repair

Solution Approach 1:

The patent divides the housing into distinct components (housing body, base, reel assembly) that can be separately assembled and disassembled. The gripping loop is also a separate component that can be independently installed, facilitating easy maintenance and repair while maintaining compact integration.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The housing structure serves multiple functions: it contains the reel mechanism, provides structural support, and forms the gripping loop itself. This multi-functionality reduces the number of separate parts needed, simplifying assembly and disassembly while optimizing space utilization.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Volume of moving object

If the gripping loop is designed to fit around the housing perimeter, then space is minimized, but the loop must be precisely shaped to match the housing

Engineering Contradiction:
Improvespace utilizationVSAvoidloop shape precision
Core Design Contradiction:
Volume of moving objectVSManufacturing precision

Solution Approach 1:

The gripping loop is merged with the housing structure, where the loop's shape is defined by the housing's lateral perimeter. This integration means that the precision requirements are distributed across the housing manufacturing process rather than requiring separate high-precision loop fabrication, simplifying production while achieving compact space utilization.

Inventive Principle:
Principle #5Merging (Combining)

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 optimizes space utilization, ensures comfort and safety for pets, maintains functionality, and allows easy part replacement, while being lightweight and attractive.

Implementation Method 1

using a spiral spring to maintain the loop's position

Methodology Applied
Scientific EffectElastic force: Elasticity

Data Source

PatentUS12543704B2Collar-leash assembly with integrated reel
Publication Date: 2026.02.10 COLLI & CO
  • US12543704B2 patent drawing
  • US12543704B2 patent drawing
  • US12543704B2 patent drawing

AI summary

The invention relates to a collar-leash assembly with integrated reel for a pet such as a dog. The leash of this collar-leash assembly can be withdrawn by unwinding, then, after use, retracted by allowing it to wind itself up. This collar-leash assembly with integrated reel for a pet comprises: —a collar (1) intended to be wound around a part of the body of the animal, —a housing (2) secured to the collar (1) and provided with a leash reel (22, 25), this housing comprising a base (4), a housing body (10), a part having a hollow, tapped center (16, 27, 31), and an assembly screw that is able to cooperate with this part (16, 27, 31), the base (4) comprising a planar part (5) having a hole (6) at its center and two branches (7) and the housing body (10) being free to rotate relative to the base (4) of the housing (2), a leash (43) of which one end is secured in the leash reel (22, 25) and—a gripping loop (3) which is secured to the other end of the leash (43) and of which the interior corresponds to the lateral perimeter (13) of the housing (2).