Spring Adjustment for Door Actuating Device
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Solution Overview
Problem
Existing door operating devices face challenges in achieving a compact design due to space-consuming spring adjustments and high manufacturing complexity, which limits their integration into narrow spaces and door leaves.
Innovation Solution
A spring adjustment mechanism utilizing a cylinder and adjusting nut, where the adjusting element is guided through the locking screw and bears against the nut, allowing for compression of the spring with minimal space requirements and simplified manufacturing, enabling adjustable spring preload without the need for complex internal geometries or anti-twist devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If complex spring adjustment mechanisms (such as worm gears or multiple threaded components) are used to adjust spring preload, then the spring force can be adjusted, but the device size increases and manufacturing complexity increases
Solution Approach 1:
The adjustment mechanism is divided into functionally independent components: a threaded adjusting element for force adjustment, a locking element for position fixation, and a spring support for force transmission. This segmentation allows each component to be simple while achieving complex functionality through their combination.
Solution Approach 2:
Instead of using a complex worm gear to convert rotational motion into linear motion for spring compression, the patent inverts the approach by using a simple threaded element that directly compresses the spring when rotated, eliminating the need for intermediate gears and reducing overall complexity.
2Ease of operation
If traditional spring adjustment mechanisms are used, then spring preload can be adjusted, but the adjustment mechanism occupies considerable space
Solution Approach 1:
The adjusting element and locking element are nested within the spring support structure, with the adjusting element positioned inside the spring support and the locking element engaging with features on the adjusting element. This nesting arrangement minimizes the overall volume of the adjustment mechanism while maintaining full adjustability functionality.
Solution Approach 2:
The patent combines the adjustment and locking functions into a compact integrated assembly where the adjusting element, locking element, and spring support work together in a unified structure. This merging eliminates the need for separate adjustment mechanisms and reduces the overall space required.
3Reliability
If complex internal geometries and anti-twist devices are incorporated into the spring adjustment mechanism, then adjustment stability improves, but manufacturing outlay increases
Solution Approach 1:
The adjusting element is designed to be self-centering and self-aligning through its geometric features, eliminating the need for complex anti-twist devices. The threaded structure and supporting surfaces automatically maintain proper alignment during adjustment, ensuring stability without requiring additional manufacturing complexity.
Solution Approach 2:
The spring support acts as an intermediary component that provides a stable, guided path for the adjusting element. This mediator ensures that the adjusting element moves linearly and remains aligned during spring compression, providing adjustment stability through a simple guided structure rather than complex anti-twist mechanisms.
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
This solution results in a compact, universally applicable spring adjustment that reduces manufacturing complexity and allows for easy adjustment of spring preload, ensuring sufficient energy storage for door closure while minimizing design size and eliminating the need for complex configurations.
Implementation Method 1
the adjusting element guided through the locking screw and which comes to rest on the adjusting nut, by means of which the spring (4) can be compressed
Implementation Method 2
adjusting element guided through the locking screw being at least partially non-positively and/or positively connected to the cylinder (8) in which it is engageable
Data Source
Figure 1
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AI summary
The invention relates to a door actuation device (1) comprising a housing (2), at least one drive unit arranged in the housing (2) which can be coupled to a door leaf, and at least one spring force storage device (3) which is operatively connected to the drive unit and which has a spring (4) arranged under a spring preload, wherein the spring preload of the spring (4) is effected by means of a spring adjustment (5) which comprises at least one locking screw (6) connectable to the housing (2) and an adjusting nut (7).According to the invention, a cylinder (8) oriented towards the spring (4) is provided on the locking screw (6), on which the adjusting nut (7) is guided linearly, wherein an adjusting element (9) guided by the locking screw (6), which can be engaged in the cylinder (8) at least partially by force and/or form locking and which rests against the adjusting nut (7), serves to adjust the spring preload.