Door Closer Pulling Arm Torque Class Selection
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Solution Overview
Problem
Existing door closer installations require careful positioning relative to the hinge line to determine the torque class, which is time-consuming and prone to errors, as the same door closer is often used for different torque classes to minimize production costs.
Innovation Solution
The door closer arrangement features a pulling arm with a hole containing sector areas of toothing and a rotational axis with counter-sector areas, allowing the pulling arm to be easily and reliably positioned at a consistent location relative to the hinge line, enabling selection between two torque classes (EN3 and EN4) by adjusting the angle of the pulling arm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the same door closer is used for different torque classes (EN3 and EN4), then production costs remain reasonable, but installation time increases and installation precision deteriorates due to the need for careful positioning relative to the hinge line
Solution Approach 1:
The hole in the pulling arm is segmented into multiple sector areas (first, second, third, fourth sectors) corresponding to different torque classes. Each sector area aligns with specific toothing on the rotational axis to achieve the desired torque characteristic, allowing the same door closer to be adapted to different applications through simple rotational positioning.
Solution Approach 2:
The pulling arm is made rotatable relative to the rotational axis, enabling dynamic adjustment of the sector area orientation. This rotation allows the installer to select the appropriate sector area for the specific torque class requirement, transforming a static component into a dynamically adjustable one that adapts to different installation scenarios.
2Adaptability or versatility
If the door closer installation position is adjusted relative to the hinge line to achieve different torque classes, then torque class selection is possible, but installation complexity and difficulty increase
Solution Approach 1:
The hole is divided into distinct sector areas that correspond to different torque classes. Each sector area is associated with specific toothing configurations on the rotational axis, providing clear visual and mechanical guidance for achieving the desired torque characteristic without requiring complex calculations or measurements.
Solution Approach 2:
The toothing and sector area configuration provides self-aligning functionality during installation. The geometric features guide the pulling arm into the correct rotational position relative to the rotational axis, enabling the installer to achieve proper torque class selection through simple connection operations without requiring external measurement tools or complex positioning procedures.
3Adaptability or versatility
If the door closer is installed at different positions relative to the hinge line, then different torque classes can be achieved, but installation precision requirements increase
Solution Approach 1:
The sector areas and toothing are pre-configured during manufacturing to correspond to specific torque classes. This preliminary arrangement of geometric features ensures that when the pulling arm is connected to the rotational axis, the correct torque characteristic is automatically achieved through the predetermined alignment of these features, eliminating the need for post-installation adjustments or precise measurements.
Solution Approach 2:
The invention replaces the traditional mechanical positioning method (adjusting installation distance from hinge line) with a geometric alignment system. The sector areas and toothing provide a mechanical interface that automatically establishes the correct angular relationship between the pulling arm and rotational axis, substituting complex spatial positioning with simple feature-to-feature alignment.
Data Source
Figure 1~2
Figure 3~4
Figure 5
AI summary
The invention relates to a door closer arrangement. The installation position of the pulling arm (3) of the door closer arrangement in relation to the door closer (1) can be selected easily and reliably, wherein also the torque class of the door closer arrangement is selected. The door closer (1) can always be installed at the same site in relation to the hinge line. This considerably simplifies and expedites installation.