Door Closer Display Device with Linear Force Indication
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Solution Overview
Problem
Existing display devices for door closers with adjustable closing forces are difficult to read, especially in worn or high-mounted installations, due to poor visibility and potential misalignment of setting scales, leading to unreliable display of set closing forces.
Innovation Solution
A display device with a separate coupling section mechanically connected to the adjusting shaft and a linearly movable display element, utilizing a pinion element with an external thread and a display element with an internal thread to convert rotational movements into linear displays, allowing for clear and reliable visualization of the set closing force, and a cap element for compact integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a rotating disc display device is used to indicate closing force, then the display is mechanically linked to the adjusting shaft, but the display becomes difficult to read when the door closer is worn or mounted at height
Solution Approach 1:
The display device is divided into two separate sections: a coupling section that connects to the adjusting shaft and a display section that shows the closing force. This segmentation allows the display section to be positioned independently for optimal readability while maintaining mechanical linkage through the coupling section.
Solution Approach 2:
The display element is moved from a rotational display (on the disc) to a linear dimension, where it can move axially relative to the coupling section. This linear movement provides a clearer, more readable indication of closing force that is not constrained by the rotational position of the adjusting shaft.
2Reliability
If the indicator device is located directly on or very close to the adjusting shaft, then the mechanical linkage is direct, but the display becomes difficult to read when the door closer is located at great height
Solution Approach 1:
By separating the coupling section from the display section, the display can be positioned at a more accessible location while maintaining accurate mechanical linkage to the adjusting shaft through the coupling mechanism.
3Device complexity
If a rotating disc with adjustment scale is used, then the display is integrated with the adjusting mechanism, but the scale becomes missing or illegible when the door closer is worn
Solution Approach 1:
The display element transitions from rotational movement (on the disc) to linear movement (axial movement relative to the coupling section). This linear display is less susceptible to wear and illegibility issues that affect rotational scales on worn door closers.
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 solution provides a clear, reliable, and easy-to-read display of the set closing force, enhancing readability and allowing for flexible positioning of the display section, while maintaining a compact design suitable for retrofitting existing door closers.
Implementation Method 1
utilizing a pinion element with an external thread and a display element with an internal thread to convert rotational movements into linear displays
Data Source
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AI summary
The present invention relates to a display device (1) for a door closer (50) with adjustable closing force, the door closer (50) comprising a rotatably actuated adjusting shaft (51) for adjusting the closing force of the door closer (50). The invention further relates to a door closer (50) with adjustable closing force, comprising a rotatably actuated adjusting shaft (51) for adjusting the closing force of the door closer (50), and further comprising a display device (1).