Inverted Door Closer Linkage for Free Movement
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Solution Overview
Problem
Conventional door closer systems are not suitable for all door types due to their optical and structural design, and they often require complex mechanisms to achieve free movement and safe closure, increasing manufacturing effort and storage costs.
Innovation Solution
A door arrangement where the door closer is mounted 'upside down' with its axis facing away from the leaf pivot axis, allowing the door to be freely moved between open and closed positions, and only exerting closing force between the partially open and closed positions, utilizing a conventional linkage door closer rotated 180° and attached to the door frame in a unique configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional door closer is used to ensure complete closure of the door leaf, then the door closing function is reliable, but the door leaf cannot be moved freely and remains under constant closing force
Solution Approach 1:
The door closer is mounted inverted (rotated 180°) with the closer shaft axis positioned on the side of the bearing axis facing away from the leaf pivot axis. This inverted configuration changes the torque application characteristics, allowing the door to move freely at larger opening angles while maintaining reliable self-closing function at smaller angles
Solution Approach 2:
The door closer exerts different levels of closing force at different door positions: no or negligible torque at partially open and fully open positions (allowing free movement), and full closing torque only between the closed position and partially open position. This spatially varying force application resolves the contradiction between free movement and reliable closing
2Adaptability or versatility
If a specialized door closer design is used to achieve free movement and selective closing, then the door operation flexibility is improved, but the manufacturing effort and storage costs increase
Solution Approach 1:
The inverted mounting configuration allows a single conventional door closer design to serve multiple functions: it enables free door movement at larger opening angles while maintaining reliable self-closing at smaller angles. This eliminates the need for specialized door closers, reducing manufacturing complexity and inventory requirements
Solution Approach 2:
By inverting the conventional door closer mounting orientation, the patent achieves versatile door operation modes using standard components, avoiding the need for custom-designed door closers and reducing manufacturing effort
Data Source
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AI summary
A door assembly (10) comprising a door frame (12), a door leaf (16) pivotally mounted on the door frame (12) about a leaf pivot axis (14), a door closer (22) for actuating the door leaf (16), and a door closer linkage (24), wherein the door closer linkage (24) is coupled at one end to a closer shaft (26) of the door closer (22) and at the other end is rotatably mounted on the door frame (12) by means of a bearing (28) about a bearing pivot axis (30), is designed and further developed with regard to largely free movement of the door leaf and safe closing using simple design means and a high proportion of identical parts compared to conventional linkage door closers, such that the bearing (28) is arranged such that, when the door leaf (16) is closed, the axis (32) of the closer shaft (26) is aligned with the axis of rotation of the leaf pivot axis (14). far side (34) of the bearing pivot axis (30) and that the door closer (22) is mounted in such a way,that when the door leaf (16) is actuated, the direction of rotation of the door leaf (16) and the direction of rotation of the closer shaft (26) are identical.