PVC Sliding Door Pet Insert with Hinged Flap

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Solution Overview

Problem

Traditional pet doors are often rigid, leading to potential injuries to pets, poor insulation, and unsightly or cumbersome installations, especially when mounted in sliding doors, which can require drywall repair and are heavy.

Innovation Solution

A pet door system with multiple horizontally hinged sections made of PVC, featuring tubular sides and cross members with adjustable brackets for secure installation, and incorporating insulation and rubber elements for a secure and aesthetically pleasing fit within sliding doors, minimizing pet injury risks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If a single rigid plastic or vinyl sheet is used as the flap, then the door structure is simple, but the pet may injure its legs by wedging them between the door frame and the rigid flap

Engineering Contradiction:

Improvedoor structureVSAvoidpet injury

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The single rigid flap is divided into multiple hinged sections that can flex independently. Each section is connected by hinges allowing relative movement, creating a segmented structure that maintains simplicity while reducing injury risk through controlled flexibility

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The rigidity parameter of the flap is modified by introducing hinged joints between sections. This changes the mechanical properties from completely rigid to selectively flexible, allowing the door to adapt to pet movement while maintaining structural integrity

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If a typical single flap is used, then the door is simple to construct, but it does not always return to the center and sealed position

Engineering Contradiction:

Improvedoor constructionVSAvoidreturn to sealed position

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

A spring mechanism is introduced to provide restoring force that automatically returns the multi-section flap to its center and sealed position after being opened. The spring acts as a feedback element that detects displacement and generates corrective force to maintain proper positioning

Inventive Principle:

Principle #23Feedback

3Ease of operation

If a pet door is mounted in a wall, then it provides a functional opening, but it requires drywall repair, painting and other work

Engineering Contradiction:

Improvepet passageVSAvoidinstallation work

Core Design Contradiction:

Ease of operationVSEase of manufacture

Solution Approach 1:

The door section is designed as a universal component that can be installed in multiple locations including sliding doors, walls, and other barriers. The standardized design with adaptable mounting options eliminates the need for location-specific custom work, making installation easier across different applications

Inventive Principle:

Principle #6Universality (Multi-functionality)

4Ease of operation

If pre-mounted sliding door inserts are used, then the pet door function is provided, but they are heavy and require cumbersome mounting

Engineering Contradiction:

Improvepet door functionVSAvoiddoor section weight

Core Design Contradiction:

Ease of operationVSWeight of moving object

Solution Approach 1:

The door section utilizes composite construction combining lightweight materials such as vinyl or aluminum frames with insulation materials. This composite approach reduces overall weight compared to solid materials while maintaining structural strength and insulation performance

Inventive Principle:

Principle #40Composite materials

5Loss of energy

If a single thick flap is used for insulation, then insulation performance improves, but the edges become rigid and can hurt the pet

Engineering Contradiction:

Improveinsulation performanceVSAvoidpet injury from edges

Core Design Contradiction:

Loss of energyVSObject-affected harmful factors

Solution Approach 1:

The thick insulated flap is segmented into multiple thinner sections connected by hinges. This segmentation maintains the total insulation value while allowing each section to flex independently, eliminating rigid edges that could injure pets

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The door sections utilize flexible vinyl or plastic materials with integrated insulation layers. This flexible construction provides necessary insulation while maintaining edge softness and flexibility to prevent pet injury

Inventive Principle:

Principle #30Flexible shells and thin films

Data Source

PatentUS8074606B1Plastic pet door assembly

Publication Date: 2011.12.13 IDEAL PET PRODS

AI summary

A door section for fitting in a sliding door frame is preferably made of plastic, e.g., PVC. The door section contains a built in pet door. The door section is formed by tubular sides and cross members, and has plastic brackets or fittings that press fit within the tubular members and preferably also may be screwed in place, or otherwise fixed in place, e.g., using epoxy, or both screws and epoxy. Alternatively, the corners of the door section may be welded or otherwise fixed together. The door section has brackets on its side edges for hanging or connecting to the inside of the sliding door frame, and the door section may also have a bracket or catch on the other side edge from which the door section connects to the frame. This bracket or catch is for the existing sliding door's lock. Preferably, insulation strips are provided and preferably an H-shaped vertical section may fit on top of the door section and inside the frame for a fit with less play, and for a smoother or cleaner look. Rubber or rubbery elements may be placed over the sliding door's bottom track, for the door section to sit more securely. The door section preferably also has a glass or other clear material in it above the pet door.