Hinge-Pin Door Blocker for Stable Open-Door Retention
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Solution Overview
Problem
Existing doorstops often fail to securely maintain doors in open positions, particularly when subjected to closing forces, and may slide out of the gap between the door and the jamb.
Innovation Solution
A door blocker with a body and nose configuration that engages a hinge pin, featuring a bridge that encircles the pin to provide lateral and rotational stability, maintaining the door at an angle greater than 80 degrees from the closed position, and includes a robust structure to absorb closing forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing doorstops are positioned between the door and the floor or jamb, then they can hold the door open, but they fail to securely maintain doors under closing forces and may slide out of the gap
Solution Approach 1:
The door blocker transitions from conventional floor-based or jamb-based positioning to hinge pin-based positioning. By engaging the hinge pin vertically and using the bridge to rest on its top surface, the device anchors itself in a new dimensional space within the door assembly, preventing sliding and rotational movement that plagues traditional doorstops.
Solution Approach 2:
The hinge pin serves as an intermediary element that the door blocker engages to achieve secure positioning. Rather than directly opposing door closing forces through friction or compression alone, the blocker uses the hinge pin as a mechanical anchor point, transferring and distributing forces through the bridge structure that rests on the pin's top surface.
2Reliability
If a door blocker engages the hinge pin to prevent sliding, then it improves security, but it increases device complexity
Solution Approach 1:
The door blocker is segmented into three functional components: a body for engagement, a nose for positioning, and a bridge for support. This segmentation allows each component to perform its specific function efficiently while keeping the overall structure relatively simple and manufacturable.
Solution Approach 2:
The bridge structure merges multiple functions: it connects the body to the nose, provides a resting surface on the hinge pin, and creates lateral and rotational stability. By combining these functions into a single integrated element, the design avoids adding excessive complexity while achieving the desired security.
3Strength
If the door blocker uses a robust structure to absorb closing forces, then it improves door holding capability, but it increases the device's weight and size
Solution Approach 1:
The bridge structure acts as a counterbalancing element that distributes closing forces across multiple contact points: the hinge pin's top surface, the body's engagement surfaces, and the nose's positioning surfaces. This force distribution allows the use of lighter materials and smaller dimensions while maintaining adequate strength.
Solution Approach 2:
The door blocker is positioned in advance to engage the hinge pin before door closing forces are applied. The bridge is pre-positioned to rest on the pin's top surface, creating a stable triangular support structure that passively absorbs and redirects closing forces through the hinge assembly rather than requiring a heavily fortified body.
Data Source
AI summary
A door blocking device includes a body having a first surface and a second surface, a nose that includes an attachment aperture, and a bridge the extends between the body and the nose. The bridge, the body and the nose define a receptacle that is adapted to rest on a hinge pin in a blocking position to locate the first surface against one of a door and a jamb of a door assembly, and to locate the second surface against the other of the door and the jamb of the door assembly. The first surface and the second surface in the blocking position are adapted to retain the door in an open position characterized by an angle of greater than 80 degrees with respect to a closed position of the door.