Chicago Barrel Bolt Doorstop Secure Mounting
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Solution Overview
Problem
Prior art doorstops often damage the door corner and fall off due to weak attachment, failing to securely prevent doorknob impact on adjacent walls without compromising the door's integrity.
Innovation Solution
A Chicago barrel bolt doorstop assembly with a post assembly featuring internal threads and a fastener with matching threads, allowing secure mounting between the door sides to prevent damage and enhance resistance to forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If prior art doorstops are mounted onto the bottom corner of a door, then they can prevent doorknob impact on walls, but they damage the door corner and fall off
Solution Approach 1:
The doorstop assembly is divided into separate components: a mounting plate that attaches to the door surface, a shaft that extends from the mounting plate, and a bumper at the distal end. This segmentation allows the mounting plate to distribute attachment forces across a larger area of the door, preventing localized damage while maintaining secure attachment.
Solution Approach 2:
The mounting plate serves as an intermediary element between the doorstop assembly and the door surface. It provides a stable attachment interface that spreads the mechanical stress over a larger area, preventing the door corner damage that occurs with traditional point-mounted doorstops.
2Ease of manufacture
If prior art doorstops use simple mounting, then they are easy to install, but they compromise the door corner and fall off
Solution Approach 1:
The mounting plate extends the attachment interface from a single point (traditional doorstop mounting) to a two-dimensional surface area. This dimensional change allows for multiple screw attachment points distributed across the plate, significantly increasing attachment strength while maintaining ease of installation through a standardized mounting process.
3Reliability
If prior art doorstops are designed with complicated features, then they attempt to solve mounting issues, but they fail to efficiently prevent door damage
Solution Approach 1:
The mounting function is extracted as a separate component (mounting plate) distinct from the doorstop shaft and bumper components. This allows the mounting plate to be optimized specifically for attachment reliability without adding unnecessary complexity to the doorstop's primary function of preventing wall impact.
Solution Approach 2:
The mounting plate serves multiple functions: it provides a stable attachment interface for the doorstop assembly, distributes mechanical stress across a larger door surface area, and offers a standardized mounting pattern that works with various door thicknesses and materials, achieving reliability without complexity.
Data Source
AI summary
A Chicago barrel bolt doorstop assembly having a doorstop with a first shaft extending between a distal end and a butt end. Protruding from the butt end is a post assembly having a post. The post assembly further has internal threads. A fastener has a second shaft with threads, a head, and a third end. The threads extend from the third end towards the head. To mount onto a door, the first end of the post assembly is presented into a hole from a first side of the door, and the third end of the fastener is presented into the hole from a second side of the door, whereby the hole extends between the first and second sides of the door. The first end receives the third end and the fastener tightens into the post assembly.